Manual SC600
Contents
1. 4 2 Laser Modules The laser modules of GAMPT are equipped with red green or blue laser diodes of the laser classes 3R green and red and or 2 blue for carrying out acousto optical experiments Debye Sears effect projection of standing ultrasonic waves etc For the carrying out of experiments the laser multi frequency probe 1 sound radiation surface moulded 2 probe housing 3 connecting plug LEMO 4 connection cable Fig 26 laser module red 1 laser beam exit window 2 laser diode shell 3 coaxial power connector for connection to SC600 4 connection cable 14 GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Accessories modules are fastened in the laser support of the AOM sample reservoir Fig 27 Voltage is supplied to the modules via the LASER unit of the SC600 For this the laser module is connected via its coaxial power connector 3 to the SC600 4 3 Sample Reservoir and Probe Adjustment Fig 27 cross sectional diagram of sample reservoir cover with probe adjustment probe and laser support 1 adjustment screws for probe alignment 2 cover 3 probe support 4 ultrasonic probe 5 locking screw for laser module 6 holding well for projection lens 7 support for laser modules 8 locking screw for ultrasonic probe 9 glass vessel The production of standing ultrasonic waves takes2. determine with a high degree of precision the sound velocity in the liquid thorough which the sound is passing If the distance s Fig 31 diagram of the geometric conditions for the Debye Sears test between ultrasonic wave and diffraction pattern the number N of diffraction maxima the distance x between the Nth and Nth diffraction order the sound frequency v and the wavelength A of the laser light are known the wavelength of the sound A and the sound velocity c in the liquid can be calculated according to the following formulae Example Measurements Table4 summary of given measured and calculated values Liquid Given Values Measured Values Calculated Values eee vin MHz A innm N sinm xincm sinpm cin m s cin m s Water 4 650 rot 4 2 9 4 1 367 8 1 471 1 480 at 20 C Glycerine 4 650 rot 2 2 9 1 6 471 2 1 885 1 900 at 25 C 18 GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Practical Experiments 5 3 Projection of Standing Waves Astanding ultrasonic wave in a liquid can be directly imaged by means of divergent monochromatic light Due to the standing wave sound pressure differences are produced in the liquid which repeat periodically along the sound beam axis The localised density differences caused by this result in spatially differing and periodically Fig 32 projection patterns of standing ultrasonic waves in water at sound fr
3. ACCESSO ES ocana nn E E EA E EE EN A E E O EEEE rE SEa 22 7 Revisions of the User imantal c 0 ccs csveadevoevteds ccnsencdecnwuede esuaeleusesdwedede ena e iE e 24 Please read through the whole user manual before using the device and e accessories Sound Wave Controller SC600 User Manual Version 1 01 EN 1 Safety Instructions 1 Safety Instructions Please read through the following instructions thoroughly before commissioning the ultrasonic generator and accessories for your own safety and the operational safety of the device gt The opening slits on the device are for ventilation and must be kept absolutely free in order to prevent the device from overheating It is recommended to use the folding feet on the device Make sure that the voltage values and fusing stated for the device are adhered to in the electricity supply Never try to insert objects through the openings on the device because this can lead to short circuits or electric shocks Only connect the ultrasonic transducer supplied by the company GAMPT mbH to the output of the ULTRASONIC unit marked PROBE Be careful there are voltages of up to 50 Vand currents of up to 1000 mA Do not operate the connected ultrasonic transducer without contact with a liquid because it can lead to overheating and thus to the destruction of the transducer Switch off the output PROBE of the SC600 if the ultrasonic probe is not connected or not needed Because powe
4. supplied by GAMPT are equipped with laser diodes of the laser classes 2 and 3R EN 60825 1 with a wattage from lt 1 mW and or lt 5 mW Before using these modules please find out about the necessary protective measures Be careful Do not switch on a connected laser module if there are people in the direction of the beam Do not look into the laser beam and do not direct the laser at other people or animals Switch the laser module off when you do not need it Sound Wave Controller SC600 User Manual Version 1 01 EN 13 Accessories 4 Accessories In the following the accessories required for the Debye Sears test and the projection of standing ultrasonic waves are described You can find information about other accessories in the GAMPT Catalogue Education and on our website 4 1 Ultrasonic Probe Especially for use with the cw generators SC500 and SC600 a multi frequency probe was developed by GAMPT that is distinguished by very good sound producing characteristics in a frequency range from 1 MHz to over 10 MHz It is equipped with a robust metal housing and the sound radiation surface is moulded to be watertight The probe can be directly connected to the output PROBE of the ultrasound generator of the SC600 via a special LEMO plug Be careful Do not operate the ultrasonic transducer without contact with a liquid to avoid overheating and thus the destruction of the transducer see also chapter 3 4 2 page 11 ed seq
5. the back of the SC600 On the back of the device there is a socket for the mains connection A fuse holder is built into the bottom part of the socket This holds the fuse for the device and a reserve fuse Changing the Fuse To change the device fuse the fuse holder must be pulled out of the socket Fig 4 Necessary fuse type T 1A see section 6 Fig 3 socket with partially pulled out fuse holder i Caution The device works with mains voltage Touching voltage carrying parts is dangerous to life Switch the device off and pull the mains cable out of the plug before you pull out the fuse holder is used there is a risk of fire Attention Only replace the fuse with the type stated in the manual If the wrong type of fuse GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Sound Wave Controller SC600 3 3 LCD Display For the setting and presentation of the device parameters there is an LCD display with 4 lines each with 16 characters About 2 seconds after the device is switched on the welcome screen appears in the LCD display also stating the version number of the device software Fig 5 GAMPT mbH S C600 Software Version 2 1 Maerz 2013 Fig 5 welcome screen After initialisation has finished the start screen Fig 6 is displayed Line 1 now contains information on the operating mode and the signal shape Line 2 is for displaying the setting values of t
6. 2 34 AN Fig 20 initial state MODE Cw SIN KR 1000000 Hz U 45 89V LASER TOTOR NTA TA TZANA Fig 21 right button gt one place to the right MODE Cw SIN Fig 1000000 Hz U 45 89V LASER TiO a MO 2a Ae A dey 2 4s LV Fig 22 left button one place to the left 10 GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Sound Wave Controller SC600 Setting Values Signal Generator Signal Variables The possible setting values of the signal variables are summarised in Table 1 The smallest possible increment is given as the step size The actual step size is dependent on the decimal place that was selected beforehand in the setting Table 1 setting values for the signal variables of the signal generator Signal Variable Unit Minimum Maximum Step Size Frequency Hz 1 20 000 000 1 Amplitude mVss 0 2500 1 Pulse Repetition Frequency Hz 1 20 000 1 Burst Length ps 1 65 000 1 3 4 2 Ultrasound Generator ULTRASONIC UNIT The connections and controls of the ultrasound generator are located on the left side of the device The multi frequency probe from GAMPT is connected to the output marked PROBE 12 The sound power is set via two knobs With the left knob 1 the threshold value for the transmitting current CURRENT is regulated The transmitting voltage VOLTAGE is set with the right knob 2 The possible setting values for current and voltage are summarised in Table 2 All
7. ER a 0 10 20h AC REY 2 oe i V Fig 13 frequency initial state MODE CW SIN AMP 1000 mVss U 45 89V LASER 1 0 021A 2 41V Fig 14 turn right amplitude of the SIGNAL output MODE CW SIN PRFE 1000 Hz U 45 89V LASER Leono ZAAT E T2 ey 24 ay Fig 15 turn right pulse repetition frequency with burst and pulse MODE Cw SIN BuL 10 mys U 45 89V LASER LeO S020 Ae Se 2 4a AV Fig 16 turn right burst length is also equal to the double pulse width in the pulse mode Sound Wave Controller SC600 User Manual Version 1 01 EN Sound Wave Controller SC600 Setting the Values of the Signal Variables After the signal variable to be set has been selected Fig 13 16 the value of the signal variable can be set using the knob 4 VALUE MODE and the two buttons gt 13 By turning the knob 4 the value of the selected decimal place is changed Turning to the left reduces the value and turning to the right increases the value MODE Cw SIN Ee 1000000 Hz U 45 89V LASER 10 02 O ae 2h aa iv Fig 17 initial state MODE CW SIN alee 1100000 Hz U 45 89V LASER Up ese10 OZ VAG E TZ TANN Fig 18 increase the value by turning right MODE cw SIN Rig 900000 Hz U 45 89V LASER Dasa T AZ PA eye 2a AV Fig 19 reduce the value by turning left With the buttons gt 13 the decimal place to be changed can be selected MODE Cw SIN Re 1000000 Hz U 45 89V LASER 13 0 20 2 0A
8. Training Aid SOUND WAVE CONTROLLER SC600 Ultrasound Generator with Accessories for the Debye Sears Test and Projection of Standing Ultrasonic Waves N User Manual wn gampt d gaMPT ULTRASONIC SOLUTIONS Revision Version 1 01 EN Dezember 10 2015 Gesellschaft fiir Angewandte Medizinische Physik und Technik mbH Hallesche Strasse 99F 06217 Merseburg Tel 49 3461 278691 0 Fax 49 3461 278691 101 Email info gampt de Visit us on the internet www gampt de 2015 GAMPT mbH All rights are reserved for GAMPT mbH No part of this manual may be reproduced or processed copied or distributed in any form without the prior approval of GAMPT mbH GAMPT mbH is not liable for damages occurring as a result of incorrect use or for repairs and alterations carried out by third parties not authorised by GAMPT mbH Subject to technical alterations Errors excepted Printed 12 10 2015 Version 1 01 EN Table of Contents Table of Contents Safety WAStructl Ons csiecd nice nei aioe nevus sian hes EEE EEEE EEE EE E EEEE EE h 2 2 introd ctiom senenin aaea a EA E EE E EEEE TEN R N 3 3 Sound Wave Controller SCOOO oc seccsstacevisecicosceees sovseadscesconsaceereiaccycdeceaa Heese E EE S 4 3 1 Front Viewsof the SCG0O rirerire eriin raeas E EEE EEE ETE EE Ea eS ei 5 3 2 Backofthe SC600 ssis e E EEEE ETE 6 Bi LED IDG Play arsane nerea E E E E A E EE 7 3 4 Operation Ofthe SC OOU is se daiceat
9. anide noas a a aa a a naas 7 3 4 1 Signal Generator Frequency Generator sssesserssrereeesesssrrerreersesersrreeerereeeeeesereee 7 3 4 2 Ultrasound Generator ULTRASONIC UNIT cccscccssccsscceecceeeseeseeeseeeseeeseeeeseeesens 11 3 4 3 Voltage Supply for Laser Modules LASER sivsccacaccsoessossssacnecasesweisonsacncestensensnswonuas 12 Her AGCESSOLIES cai coevennsadeedcessndeacsuwetveceasznedeeseensbecocedebsy E deb esos vannsvesyodependesnsenetraneossvetedens 14 AA Ultrasone PhO DEd sedan sbikivwssvudeven obilinvesve cases babe eusioevederanstabasuwsevdeyesdeasesess veseiwesbencabe 14 G2 Laser MODULES ic 2ccee cazescensseecnendaeecce san Suldesend serous saydeaussomsaneesupeddavnceecctensaPedeescaneeeeee 14 4 3 Sample Reservoir and Probe Adjustment sisnacsasiarecsevesnnasvasadiesivenaantentnnesiveomigaa tions 15 Hele Projection LEnS ssie ea ae a EEE E Ea EEEE a aE 16 5 Practical EXPEriMENtSuinssnssssinienensis niiin dan eae as aiis 17 5 1 General ExperimentinstrUCtionS sicasiauwsirceawnomenadunninessionnnas cantatas EE KEE E ES 17 52 DebyesSears Ethe Gtisciwccsscsweeecevevseisuvanevedaneiveteavewseedees viaxcchay vines E ENERET ES 18 5 3 Projection of Standing Waves sduivensasananagvasuUcadyasuoraesarnwnadsaratasanusasauchudarnsnnsasuniuanenes 19 6 Technical Detalls seccvvvicvewss vay iieii iiin EEEE REEERE EE EEE 21 6 1 Sound Wave Controller SC600 GAMPT 20100 scccseeccesceesceesecsccenceenceesceseeeeseeens 21 6 2
10. b 4 VALUE MODE MODE CW SIN Fe 1000000 Hz U 45 89V LASER 1 0 021A 2 4141V Fig 7 cw mode initial state MODE BURST SIN Fits 1000000 Hz U 45 89V LASER M2710 PON FZ erie VAS ee 22520 a Fig 8 1x pressing change into the burst mode MODE PULSE SIN Rie 1000000 Hz U 45 89V LASER LORAZ TTA TA T 2 as Fig 9 2 x pressing change into the pulse mode Selection of the Signal Shape The currently set signal shape sine square or triangle is also displayed in line 1 of the LCD It can be changed by pressing the knob 5 SELECT WAVEFORM MODE cW SIN Ei 1000000 Hz U 45 89V LASER BGO E 02A AE 2a Fig 10 sine initial state MODE cw SQU Rig 1000000 Hz U 45 89V LASER Heo ON 2TA A ci A IV Fig 11 1 x pressing selecting square signal MODE Cw TRI Ei 1000000 Hz U 45 89V LASER 1 0 021A 2 41V Fig 12 2 x pressing selecting triangular signal GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Sound Wave Controller SC600 Selection and Display of the Signal Variables of the Generator Signal The following signal variables as shown in Table 1 can be displayed and changed at the frequency and or signal generator signal frequency signal amplitude pulse repetition frequency and burst length The signal variable to be displayed and or set is selected by turning the knob 5 SELECT WAVEFORM MODE cW SIN Ee 1000000 Hz U 45 89V LAS
11. d to trainees at schools colleges and universities in a simple and compact way Fig 1 With this both the frequency dependence can be demonstrated and the wavelength of the ultrasound in different liquids and thus the material specific sound velocity can be determined Fig 1 SC600 and Debye Sears set 1 laser module 2 ultrasonic probe 3 sample reservoir with probe adjustment and laser support 4 Sound Wave Controller SC600 Sound Wave Controller SC600 User Manual Version 1 01 EN 3 Sound Wave Controller SC600 Furthermore it is possible to project a standing ultrasonic wave simply For this an optical lens is placed between the laser source and ultrasonic wave so that the standing wave is shone through by divergent laser light The periodically repeating fluctuations in density along the sonic beam axis cause a varying refraction of the laser light The result is an image with a distribution of bright and dark areas which is determined by the wavelength and thus the frequency of the ultrasound You can find further information on other possible applications and accessories in our current catalogue and on our website 3 Sound Wave Controller SC600 The device allows the generation of continuous sound waves cw continuous wave at high power over a wide frequency range up to 20 MHz and can also be operated in burst or pulse mode In addition to the ultrasonic generator a signal generator and a cont
12. equencies of repeating refraction indices along the 2 8 MHz 3 5 MHz and 4 5 MHz obtained with sound beam axis When monochromatic red laser light light is used the projection of the standing wave therefore shows a light dark modulation with periodically repeating brightness maxima which correspond to the density differences Fig 32 To determine the wavelength from the distribution pattern and the geometry g amp refraction corrections due to the glass walls La and the measuring liquid must still be taken into account Fig 33 as well as the focal distance f of the lens in air To Fig 33 diagram of the geometric conditions during the determine the wavelength exactly it is projection of a standing ultrasonic wave therefore recommended that the method of light refraction be used as described in Section 5 2 pobra ai he tormi h Iculati Ac LAX Mee 3 The formula 3 states the exact calculation N p Sit Be ata rule for the sound wavelength s from the Ng n projection image The spacing a between sound field and glass wall on the lens side and the distance a can be assumed as an approximation to be half of the respective inside dimension The thickness of the glass g4 corresponds to the sum of the wall thickness of the glass vessel and the thickness of the glass substrate of the projection lens The refraction indices n of the measurement liquid and ng of the glass must be determined or
13. he signal generator In lines 3 and 4 the voltage and current values on the PROBE output are shown on the left and on the right the voltage value on the LASER output is displayed MODE cw SIN Line 1 signal mode and signal shape display El 1000000 Hz Line 2 setting value display U 45 89V LASER Line 3 ultrasonic voltage display I 20 FO 2AN A T 2 ATV Line 4 ultrasonic current display and laser voltage display Fig 6 start screen Version 2 1 3 4 Operation of the SC600 3 4 1 Signal Generator Frequency Generator The built in signal generator can generate signals with frequencies from 1 Hz to 20 MHz which can be digitally adjusted in steps of 1 Hz As well as the cw mode CW the device can also be operated in burst and pulse mode BURST PULSE Sine triangular and square wave signals SIN TRI SQU can be generated The settings are made using two knobs with pressing function 4 VALUE MODE and 5 SELECT WAVEFORM and the two buttons 13 to select the decimal place The signal frequency can be tapped at the TTL output 15 as a square wave signal 0 5 V At the SIGNAL output 16 the generator signal is supplied according to the parameters set Sound Wave Controller SC600 User Manual Version 1 01 EN 7 Sound Wave Controller SC600 Changing the Mode The currently set mode cw burst or pulse is displayed in the first line of the LCD The change between the modes is carried out by pressing the kno
14. lass substrate 3 gripping surface Fig 29 positioning of the projection lens 16 GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Practical Experiments 5 Practical Experiments The following list contains suggestions on practical experiments that can be carried out with the SC600 and appropriate accessories Brief descriptions of and information on the required equipment setting up and performance can be found in our catalogue and on our website The Debye Sears effect and the projection of standing waves are described in more detail in the sections 5 2 and 5 3 5 1 PHY11 Debye Sears Effect PHY12 Projection of Standing Waves PHY17 Acousto Optical Modulation at Standing Waves PHY19 Phase and Group Velocity PHY24 Thermoacoustic Sensor INDO4 Concentration Measurement with Resonance Cell General Experiment Instructions The following instructions should be adhered to in order for the experiments to work If possible degassed water is to be used because air bubbles interfere with the sound field as well as the course of the laser light Air bubbles on the ultrasonic probe are to be removed The largest possible distances between the sample vessel and projection wall are to be used in order to enlarge the spacings between the diffraction orders and to minimise measurement mistakes If no measurement is being carried out the ultrasound should be switched off in order to p
15. length correspond to the values set at the signal generator coaxial power connector jack for plug with 5 5 mm outside diameter and 2 5 mm internal diameter can be switched off LED indicator light 1 7 3 5 V DC continually adjustable Multifrequency Probe GAMPT 20138 Frequency Dimensions Transducer Element Cable 1 MHz up to approx 13 MHz 65 mm x 27 mm Lx D without cable disc with 16 mm diameter length approx 1 5 m LEMO jack for connection to PROBE output of the SC600 22 GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Technical Details Sample Reservoir GAMPT 20225 Dimensions 123 mm x 115 mm x 144 mm W x H x D Material glass wall thickness 4 mm Laser Support 17 mm holding opening for laser modules holding well for projection lens Probe Adjustment GAMPT 20224 Dimensions 123 mm x52 mm x 105 mm W x H x D Material POM Probe Support suitable for GAMPT ultrasonic probes three point adjustment apparatus Laser Modules GAMPT 20210 20212 Beam Spot lt 6 mm at distance of 3 m Wavelengths 650 nm red 532 nm green 405 mm blue Power red green lt 5 mW laser class 3R EN 60825 1 blue lt 1 mW laser class 2 EN 60825 1 Supply Voltage max 3 5 V DC Power Consumption red max 40 mA green max 375 mA blue max 90 mA Module Dimensions length approx 90 mm diameter 17 mm Connection Cable cable length approx 1 m coa
16. obe will overheat and thus be destroyed Switch off the power supply of the probe via the switch 7 if the probe is not required 3 4 3 Voltage Supply for Laser Modules LASER For the acousto optical tests based upon the diffraction or refraction of light at an ultrasonic wave GAMPT supplies laser modules the laser diodes of which continually emit monochromatic light in the red green or blue range of the visible spectrum You will find the connection and controls for the laser modules on the right side of the device front under LASER The laser module to be used is connected to the output marked LASER 17 The supply voltage Table 3 is set and regulated via the knob 6 Table 3 setting values for supply voltage of laser Variable Unit Minimum Maximum Step Size Voltage V 1 7 3 5 Continuous The current voltage value at the LASER output 17 can be read in line 4 of the LCD display 3 MODE cW SIN E 1000000 Hz U 45 89V LASER EO OZ Ave H 2a ATV Fig 24 display ofthe voltage at the LASER output 12 GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Sound Wave Controller SC600 Below the knob 6 there is the on off switch for the LASER output 17 The status of the output is displayed via the indicator LED 10 below the on off switch 9 If the LED lights up the LASER output is switched on and the connected laser module is supplied with power Attention The laser modules
17. other parameters such as mode signal frequency pulse frequency pulse repetition frequency or brush length are set using the signal generator as described above Section 3 3 1 Table 2 setting values transmitting voltage und current limit on the ultrasound generator Variable Unit Minimum Maximum Step Size Voltage V 2 50 Continuous Current mA 0 1 000 Continuous The current values of transmitting voltage and current limit can be read in lines 3 and 4 of the LCD display 3 MODE cW SIN Ea 1000000 Hz U 45 89V LASER 1 0 021A 2 41V Fig 23 voltage U and current I at the ultrasound generator Sound Wave Controller SC600 User Manual Version 1 01 EN 11 Sound Wave Controller SC600 The power supply of the ultrasonic probe can be switched on and off using the switch 7 PROBE ON OFF The status of the PROBE output 12 is displayed by the indicator LED 8 above the connection If the die LED lights up the ultrasound generator output is switched on and the ultrasonic probe is supplied with power Be careful There can be voltages up to 50 Vand currents up to 1000 mA at the PROBE output Switch off the PROBE output indicator LED is off if the ultrasonic probe is not connected or not needed Attention A high wattage is used in the ultrasonic probe which leads to heating of the probe Do not operate the connected ultrasonic probe without contact to the test object liquid sample reservoir etc because otherwise the pr
18. place in a glass vessel open at the top 9 The sample vessel is covered with a special cover 2 The cover is equipped with a support 3 for the ultrasonic probe 4 Cover and probe support are connected to each other via three tension springs and three adjustment screws 1 so that the sound axis of the ultrasonic probe being used can be aligned exactly perpendicularly to the bottom of the tank Due to the possibility of three point adjustment the incident sound wave and the sound wave reflected at the vessel bottom can be made to overlap precisely thus producing a standing ultrasonic wave A support 7 for a laser module is attached to one wall of the sample vessel so that the sound wave can be shone through ata perpendicular angle The support is also equipped with a holding well 6 for a projection lens for the experiment of projection a standing ultrasonic wave Sound Wave Controller SC600 User Manual Version 1 01 EN 15 Accessories 4 4 Projection Lens The projection lens consists of a rectangular glass substrate 2 with gripping surface 3 and the actual optical lens 1 The lens is plano convex and glued onto the glass substrate For the projection experiment the projection lens is pushed into the holding well of the laser support on the sample vessel The correct positioning of the projection lens is shown in Fig 29 1 2 3 Fig 28 top view of projection lens 1 plano convex lens 2 g
19. r ultrasound is produced with the device and the associated sonic transducer the sonic transducer must not be used on people or animals The laser modules currently supplied by us are equipped with laser diodes of the laser classes 2 and 3R EN 60825 1 with a performance of lt 1 mW or lt 5 mW Before using them find out about the necessary protective measures Do not switch on a laser module connected to the output LASER of the SC600 if there is a person in the direction of the beam Do not look into the laser beam and do not direct the laser at other people or animals GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Introduction 2 Introduction In 1932 Debye and Sears showed for the first time that light undergoes diffraction when passing through a liquid excited to high frequency vibrations Here the density fluctuations caused bya standing or travelling ultrasonic wave act like the grating elements of an optical diffraction grating The grating constant then corresponds to the wavelength of the ultrasound and is consequently dependent on its frequency and its speed in the medium through which the waves are passing With the cw ultrasonic generator SC600 4 from the company GAMPT mbH the wide band ultrasonic probe 2 the sample reservoir 3 with adjuster and built in laser support and a laser module 1 there is a device set available with which this phenomenon can be demonstrate
20. revent the sample liquid from heating up For exact measurements the temperature should be determined and compared For all frequencies up to 9 MHz with higher voltages and a good orientation of the transducer at least two to three diffraction maxima should be visible The projection test is substantially more sensitive to tilting of the transducer than to light diffraction In the case of projection the requirements for producing a standing wave must be more closely adhered to Sound Wave Controller SC600 User Manual Version 1 01 EN 17 Practical Experiments 5 2 Debye Sears Effect In 1932 Debye and Sears showed that light undergoes diffraction when passing through a liquid being excited into high frequency vibrations By means of this effect ultrasound can be made more or less visible When this effect is used the density maxima and minima produced in Fig 30 diffraction patterns for red laser light at sound the liquid by a standing or travelling frequencies of 3 10 MHz in steps of 1 MHz ultrasonic wave act like an optical diffraction grating The grating constant of such a grating produced by an ultrasonic wave corresponds to the wavelength of this ultrasonic wave Fig 31 It can be determined by means of the diffraction patterns of the light of a laser beam of known wavelength Fig 30 Because the wavelength is defined by frequency and sound velocity the Debye Sears effect can be used in this experiment set up to
21. rol unit for laser diode modules are also built in All adjustable device parameters and important output parameters are shown on the centrally located LCD display Attention SC600 and ultrasonic probes laser modules are adapted to each other Before you use the probes of other manufacturers please check whether the technical parameters are compatible amp GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Sound Wave Controller SC600 3 1 Front View of the SC600 ULTRASONIC UNI FREQUENCY GENERATOR PROBE ON OFF ON OFF 9 7 SOUND WAVE LASER 8 CONTROLLER CONTROL Sc600 10 A gamPT 11 12 13 14 15 13 16 17 Fig 2 front view of the SC600 1 current regulator output PROBE status LED output LASER 2 voltage regulator output PROBE on off switch device 3 LCD display output ultrasound generator 4 setting value mode button decimal place selection 5 setting selection signal shape trigger output 6 voltage regulator output LASER TTL output 7 on off button output PROBE 16 signal output signal generator 8 status LED output PROBE 17 output laser voltage 9 on off button output LASER Sound Wave Controller SC600 User Manual Version 1 01 EN 5 Sound Wave Controller SC600 3 2 Back of the SC600 Order No GAMPT 20100 gamMPT x sc 60 Ekta Model NO 13 002 MadeinGermany Serial No 150 6042 Voltage 50 60 Power Rating 200 mA Fuse TAA Fig 4 view of
22. taken from the literature N is the number of the brightness maxima and x the respective distance The sound velocity in the liquid is again calculated according to the equation 2 Sound Wave Controller SC600 User Manual Version 1 01 EN 19 Practical Experiments Comment A good projection of the standing ultrasonic wave can usually only be achieved for 4 MHz with the glass sample vessel that is supplied Particularly for 1 MHz there can be destructive overlapping of the incoming ultrasonic waves with the ultrasonic waves reflected at the underside of the vessel bottom For 8 MHz the amplitude of the radiated ultrasonic wave is too low and in addition the absorption is considerably higher the absorption coefficient is proportional to the frequency squared so that no distinctly formed wave is produced Example Measurement for Water Given values focal distance ofthelensinair f 10cm refraction index of glass ng 1 45 refraction index of water n 1 33 sound frequency v 4MHz Table5 summary of the measurement values and results Measured Values Calculated Values Literature ai2incm giincm g2incm sinm xincm N sinum cinm s cin m s 4 8 0 5 0 4 3 03 8 9 9 397 1590 1 480 at 20 C 20 GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de Technical Details 6 Technical Details 6 1 Sound Wave Controller SC600 GAMPT 20100 General Dimensions Mains Voltage Power Cons
23. umption Fuse Modules 255 mm x 170 mm x 265 mm W x H x D 100 240 V 50 60 Hz max 100 VA T 1A EN 60127 2 3 G fuse link time lag 1 ampere 5 x 20 mm ultrasound generator ULTRASONIC UNIT signal generator FREQUENCY GENERATOR power supply for laser modules LASER Signal Generator FREQUENCY GENERATOR Signal Modes Signal Shapes Frequency Pulse Repetition Frequency Burst Length Output TRIGGER Output TTL Output SIGNAL Display cw burst or pulse sine triangle or rectangle lt 20 MHz adjustable in 1Hz steps 1 Hz 20 kHz adjustable in 1 Hz steps 1 65 000 pus adjustable in 1 us steps pulse width in pulse mode burst length TTL pulse in burst or pulse mode 0 5 Vpp square wave signal signal corresponding to the settings of the signal generator at lt 2 5 Vpp 4 line LCD for the display and setting of the parameter values of the signal generator and of the ultrasound generator and of the output voltage of the LASER unit Sound Wave Controller SC600 User Manual Version 1 01 EN 21 Technical Details Ultrasound generator ULTRASONIC UNIT Signal Output PROBE Status Display Output Voltage Current Limit LASER Unit Output LASER Status Display Voltage 6 2 Accessories LEMO jack can be switched off LED indicator light 2 50 Vpp continually adjustable 0 1000 mA continually adjustable mode frequency pulse repetition frequency and burst
24. xial power connector with 5 5 mm outside diameter and 2 5 mm inside diameter Projection Lens GAMPT 20230 Glass Substrate 25 mm x 75 mm roughened gripping surface Lens plano convex diameter 16 mm until 2013 12 5 mm since 2014 focal distance 100 mm until 2013 173 mm since 2014 Sound Wave Controller SC600 User Manual Version 1 01 EN 23 Revisions of the user manual 7 Revisions of the user manual Revision Revision date Description 1 00 May 7 2013 First edition 1 01 Dez 10 2015 Updated chapter Accessories 24 GAMPT mbH Hallesche Stra e 99F D 06217 Merseburg Tel 49 3461 2786910 www gampt de
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