Manual of the Rainbow Source
Contents
1. RAINBOW SOURCE Muttrpce WaveLtenctH LED amp Laser Licht Source Anfatec Instruments AG Melanchthonstr 28 08606 Oelsnitz V Germany Tel 49 0 37421 24212 Tel 49 0 37421 24221 http www anfatec de email mailbox anfatec de Manual of the Anfatec Rainbow Source Rev 1 01 Page 1 22 Table of Content Introductio serer reaa ea E ET AEEA EEN AEE EEE RSEN 3 Technical SpecifiCatiOn sciessvsicsavaceisciwensiaeseaueicdanensievavedeiidanouriieetaeededavawtdaeateteiiiewensiadsiatees 4 Part WISh oan cotsbatccaee tidal aol fafeasi tat AOE sebelah Cases dat AOR Eocene a sete tac dacts 4 General Parameters a csaccvaseeci eval ech eant eee adces ddd asada aa ede iced eben acne ee 4 Photo Diode PropertieS sssssssssssersnsersesannosnerssnsenensesanronnnrsennnsuannonanronneronnonnnnnnenenne 5 Theory of Op ratioM 502i5cnicacn seinnaa e aa OOA N ONEA EEA Ea i 6 List of LED s and laseissa sees isk leew Sas cade ae nies A ale eevee eas 7 Safety I nSt UCHO S eini aaia airaa a aa a ia aa Eiaa Raia DaKa Eai aaia aaia 9 DiS t ell ARI We Sess audits caresses aeedtee vote Sea auidteecen aaua E E EA EPRA iia eevee eae eodeecasuedeee 11 SOMWal ici E kena aee hele ates ee aon ee ee eee eee ates ae eee 11 HardWare oeste ere ae ae e a aE eaa aa a aee e ee Ea n a E ees EE 12 License of the Software s ssssssrrssrrsrrrsrrrnrrsrrnnrrnrrnnrrnnrrnnrnnnnnnnntnnrnnnnrnnnnnnnn nunne nnna 12 User ManU Aiae e a reer aeea eaaa aa aer2. 5 V provided as standby power output on the USB bus does not provide enough current for the Rainbow Source Thus the Rainbow Source does not boot in a correct way gt Reconnect the Rainbow Source to the PC after boot up of the PC to ensure a propper operation Hardware There is no special hardware installation required For the test of the instrument it is useful to short circuit the two FC connectors on top of the instrument two optical FC connectors with a 1 mm diameter wide band fiber Optical Output Signal Fiber Coupler type FC Photo Diode Input Fiber Coupler type FC At the back panel of the Rainbow Source is the USB connector for the remote control and two BNC connectors Brightness and Color The input Color is acting as AuxIn License of the Software The software is provided with the General Public License GPL This license has been developed within a project of the Free Software Foundation It gives the user the liberty to add changes in the code and the programmer the security not to get in trouble due to the users changes Most commercial software packages don t use this license because they want to keep the right to sell the newer version later as update An open software can be changed by the user So he can adapt the software to his problem Free software has to stay free even if the user add some changes Therefore GPL protects the software so that all programs which are based on a GPL pro
3. LED14 Laser 808 65 60 97 3 32 LED15 611 70 0 20 0 11 LED16 592 75 0 20 0 16 LED17 595 80 0 20 0 09 LED18 Laser 780 85 15 40 1 2 LED19 572 90 0 30 0 02 LED20 550 95 0 20 0 18 LED21 546 100 0 20 0 18 LED22 Laser 670 105 50 65 2 21 LED23 522 110 0 20 0 24 LED24 507 115 0 20 0 09 LED25 500 120 0 20 0 39 LED26 Laser 650 125 24 35 1 07 LED27 460 130 0 20 0 17 LED28 470 135 0 20 0 16 LED29 455 140 0 20 0 49 LED30 Laser 405 145 24 5 40 9 23 LED31 440 150 0 20 2 LED32 426 155 0 20 0 56 LED33 413 160 0 20 0 64 LED34 empty 0 165 0 0 0 LED35 397 170 0 20 0 41 LED36 388 175 0 20 0 09 LED37 363 180 0 20 0 02 LED38 empty 0 185 0 0 0 LED39 white 190 0 20 0 56 LED40 empty 0 195 0 0 0 Table 1 List of LEDS sorted by position on the wheel Exact typical example Manual of the Anfatec Rainbow Source Rev 1 01 Page 8 22 Safety Instructions This is a Class 2M laser device For most of the light sources the LEDs it does not require a laser class specification at all because of the large divergence of the exit beam and the wave length distribution For four of the eight laser diodes in the visual range between 400 nm and 700 nm the integral output intensity is below 5 mW and the blink reflex of the eye protects the eye from any damage Never view into the beam through an optical instrument The laser class 2M is used for the Rainbow Source because the light from the eight laser diodes exits with a large divergenc
4. Volts Manual of the Anfatec Rainbow Source Rev 1 01 Page 20 22 Additional Information This information is thought for installation purposes and not thought for the users however it might be useful to know how certain parameters have been defined Therefore they are mentioned in this manual Ini File parameters The ini file LED ini contains some scaling settings and technical information of the Rainbow Source as follows Main SerNr 2 serial number of this rainbow source this entry should NOT be there for all normal operation modes Initialize ScrollbarLamp 3 last selected light source ScrollbarBright 0 last set brightness MaxCurrent 97 this is the maximum current available in this specific hardware MinCurrent 0 minimum current of this hardware PhotoMaxMilliWatt 2 05 Maximum intensity detectable by the photo diode PhotoADCOffset 56 Offset for the photo diode input AUXOFFSET 515 Offset for the Auxiliary input AUXSCALE 22 4 Scaling factor for the Auxiliary input Furthermore the parameters of each LED are stored in this file e g for LED number 1 LED1 Wavelength 900 Step 0 Start 0 Current 50 Brightness 0 338 These parameters are shown in the table in advanced operation mode Administrator Operation This mode enabled with the admin entry in the file LEDs ini is used to re calibrate the Rainbow source or to change the operation into an administrator mod
5. that uses the LED dll DLL LabView Example LabView 11 Please copy at least the content in bin into any appropriate directory of your PC e g C Program Files Anfatec RainbowSource Connect to the USB Port of the PC and wait until Windows has installed the correct COM port drivers In order to check the correct installation open the device manager Under the section Ports Com and LPT should be a new entry AT9OUSBxxx COMx COMx shows which COM port x has been assigned to the Rainbow Source In the shown example its COM port 6 Manual of the Anfatec Rainbow Source Rev 1 01 _ gg Device Manager File Action View Help HleS en a R Leb Ge J ANFATEC DBEOS69 E9 Anfatec Measurement Interfaces ig Computer amp Disk drives 2 Display adapters 4 DVD CD ROM drives S IDE ATAJATAPI controllers 5 gt Keyboards Mice and other pointing devices Monitors E9 Network adapters gt NVIDIA Network Bus Enumerator Other devices a7 Ports COM amp LPT F ATSOUSBxxx CDC USB to UART MGM COM6 Page 11 22 Open the Com ini file as administrator in an editor Its shows Schnittstelle COMx 6 Enter the correct COM port number behind COMx Its useful to copy the executable as link onto the desktop so that it can be opened faster 7 Rainbow Source Important note The
6. PWM Low Pass 70 Hz Minimum Switch Off Time 10 ms External Brightness Adjustment Input Type BNC Maximum Input Voltage 10 V 10V Damage Threshold 12 V dc Modulation Depth 7 mA 500 mV Frequency Range 100 Hz to 200 kHz see Figure Fehler nicht gefunden Referenz Manual of the Anfatec Rainbow Source Rev 1 01 Page 4 22 Photo Diode Properties Parameter Value Detector type S4943 Spectral range 190 nm 1000 nm Peak Sensitivity 720 nm Active Area 3 mm x 3 mm Photosensitivity 720 nm 0 45 A W The sensitivity dependence vs wavelength of this detector is programmed into the Rainbow source software interface By selecting a light source the system automatically takes the detector sensitivity at the wave length of this light source into account The analogue output of the photo diode is converted by an A D converter Due to the pour resolution of this A D converter the intensity resolution of this detector is limited to about 0 04 mW Manual of the Anfatec Rainbow Source Rev 1 01 Page 5 22 Theory of Operation The Rainbow Source takes advantage of the availability of narrow band width LEDs and laser diodes in the visible wavelength range The single light sources are mounted on a wheel which is turned by a stepper motor see image When selecting a light source the wheel turns in a way that the correct light source
7. RAINBOW SOURCE WITHOUT A COVER OVER ITS OUTPUT The instrument is delivered with the following covers PLEASE PUT THEM BACK AFTER USE Internally each single light source is specified with the following parameters e the spectral output of the LED the minimum output current required for 0 01 mW output intensity the maximum output current allowed for this specific LED or Laser the detected maximum light intensity at the maximum current and e the internal stepper motor position at which the output is aligned as good as possible with the fiber output Based on these corner parameters the user can select a wave length light source and change the intensity of the output between minimum and maximum intensity The wavelength selection is possible over the USB interface only The brightness can be changed either by remote control or by the external brightness control Manual of the Anfatec Rainbow Source Rev 1 01 Page 3 22 Technical Specification Part List Rainbow Source e USB cable 2 m long e Manual Optical fiber e USB Stick with Software General Parameters Paramater Value Laser class 2M Power Supply Through USB only 5 V Current Consumption max 500 mA PC Interface Type USB2 0 Maximum Available Output Current 100 mA light source Brightness Adjustment internal Type Pulse width modulation PWM Modulation Frequency 10 kHz Corner Frequency of
8. aea aeaa Aaaa Ea ae aaa E eaea oa aE Edir Tie 13 Getting Started cinsine aaa a EUa TASE a EKANA 13 Menu entries iiini aada ariaa aa aaa aaa cates lceeiennie etn eee ened 13 Basic Operation Moden ressmanni a a a a aaa alaa aaa raa aaa 14 Advanced Operation Mode wiecceiiseeva esti ae ae eA nnn nnna 15 External Brightness Control ssssessssssnssrsnnersnsennosanronnennnnnnnannosanronnnrnenensarensnennranne 17 Home POSION rinni eaaa a e aaO aaa aAa Naia 18 Remote COME OL fice cai cases raisins vas an ca wise pe cee wowed vasnunn ce van decevencancseceddhter eeeneedecees 19 Prerequisites isinne anaa aaa aia aa aia aa iaa aia aieri ias 19 Available TUMCHOMS 2s ccss2 soca senscsanspsdsetsdandessedantentedanioossnnesensadseteencdantsneedndetaidacuendeanecns 19 Additional Informat Ohe a r deen deem tended E EEEE 21 Ini File parameters ieina raain aena aiaia aiaa aaa aaa a AEN 21 Administrator OPebanlO N42 scseaetsssecevtoecevesticen bol atoneticeaveromevaetiececsveceet ee 21 ANID FALOM A E Soles eaves E E E E E E A ven cence 21 Copyright 2013 2014 Anfatec Instruments AG All rights reserved Anfatec and RainbowSource are trademarks of Anfatec Other product and brand names may be trademarks or registered trademarks of their respective owners Anfatec Instruments AG assumes no responsibility for any damage or loss resulting from use of this manual Anfatec Instruments AG assumes no responsibility for any damage or loss resulting from use of t
9. anently used at the invisible wave length above 700 nm it is suggested to use laser safety glasses while usage Manual of the Anfatec Rainbow Source Rev 1 01 Page 9 22 Accidental connection of the Rainbow Source to the USB of a PC automatically should initialize the instrument with no output intensity Still there is a chance that a non trained person starts the Rainbow source software and accidentally the last used light source is an invisible light source with a high intensity In order avoid that an un trained person looks closer than from a 20 cm distance into the illuminated exit hole it is mandatory that the exit is covered if the instrument is not used NEVER LEAVE THE RAINBOW SOURCE WITHOUT A COVER OVER ITS OUTPUT The instrument is delivered with the following covers PLEASE PUT THEM BACK AFTER USE Manual of the Anfatec Rainbow Source Rev 1 01 Page 10 22 Installation Software The following software is provided with the Rainbow Source Location on Software Stick Description Language Format General use Delphi Source code of the program LEDLamp exe Delphi 6 0 Driver Windows driver for the USB interface inf sys Manual Manual of the Rainbow Source PDF For DLL DLL Source code of the DLL itself Delphi 6 0 DLL Scilab Example programs for the usage of the Scilab LED dll DLL TestProg Source code and executable of anj Delphi 6 0 example
10. ar C 20 0182 546 100 C 20 0178 G70 106 0 Fs 2214 S22 110 c a 0200 BC 115 C 20 oc 5CO 120 C 20 0 8 ESD 15 zA 5 1 C74 0 130 C 20 0165 70 15 20 015 kh 140 L aJ U dads T 4 F T LS BPP Fa In order to simply view the spectra of certain light sources click on any line inside the table white area of the table The selected field changes its background color to blue The shown spectrum equals the spectrum of the line indicated in blue while the selected output color is the line indicated with the green color in the 1 column of the table Example 78 15 0 In the shown image LED 4 is selected as LEDS 706 20 0 current output light source while the eps E 25 9 spectrum of LED6 is shown in the bottom part of the screen The table lists I the central wave length for each light source as text II the internal stepper motor position at which the output is aligned as good as possible with the fiber output III the minimum output current required for 0 01 mW output intensity IV the maximum output current allowed for this specific LED or Laser and V the detected maximum light intensity at the maximum current Each Rainbow Source is delivered with its own specific set of data stored in a file LEDs ini Those parameters are determined during the setup procedure of the rainbow source This setup is possible in Administrator Mode only and uses the following principles I The center wavelength is
11. axis is scaled in V Thus 70 MV ms are measured over the 10 Ohm resistor which equal 7 MAims Note that the LEDs are specified with a maximum continuous current and an allowed peak current The maximum peak current achieved with the modulation should never exceed this allowed peak current Important note it is recommended to operate the light sources not at their maximum intensity for external brightness control Manual of the Anfatec Rainbow Source Rev 1 01 Page 17 22 Home Position The current position of the mechanical wheel is stored in the internal electronics however if this electronics loses its power connection then this information gets lost Therefore it is required to find back the correct turning angle of the mechanical wheel which equals a known light source position This procedure is called Go Home and can be accessed through the menu entry Settings Go Home It is also started automatically after the Rainbow source got powered and the software was started for the 1 time after this power up During homing the wheel is turned with low power in one direction until an internal switch tells the system that the zero position is reached In Figure 1 the mechanical switch is shown as home stop at the wheel A vertical rod acts as counter stop and is mounted inside the housing The mechanical contact causes an electrical signal which is used by the logic chip to set this position to zero Aft
12. e Especially the MPE maximum permissible exposure time is not exceeded for all included light sources As per diagram published in 1 the MPE as power density for a long exposure time of 1000 s and more should be below 10 mW cm The maximum power in the Rainbow source is set for the 405 nm laser diode to be below 10 mW Directly at the exit hole this power is distributed over a diameter of 5 mm so that the power density is below 10 mW cm In normal operation it is assumed that nobody would look directly into the exit hole when the 405 nm laser is set to maximum output intensity For four of the laser diodes the laser class 2M cannot be used directly because their wave length is above 700 nm so that they are not visible For those laser diodes the laser class 1M or 3R would apply With no fiber or any optical focusing tool attached the divergence of these laser diodes is above 20 Newer look from a distance closer than 20 cm into the exit hole It is assumed that in normal operation one does look from a distance closer than 20 cm into this exit hole The maximum integral output power of the laser is limited to 1 mW In 20 cm distance the illuminated spot has a diameter of 14 cm and fills an area of 43 cm This results in a power density of 23 uW cm which is below the border for class 1M laser diodes As class 1M is lower than class 2M the Rainbow source is specified as a laser class 2M device If the instrument is perm
13. e There is a serious risk of damage This should never been done by a user Calibration Acquisition of the spectra e use Splicco exe Manual of the Anfatec Rainbow Source Rev 1 01 Page 21 22 select wave length range of the spectrum in view gt Device Settings switch from pixel to wave length in Common gt connect the fiber start LEDLampe exe select brightness and color acquire spectrum export spectrum as csv file use tab as separator save in the correct directory under the correct name Power measurement Connect the fiber to the output Use ThorLabs PM100USB Start gt All Programs gt ThorLabs gt PM100 PM200 Untillity gt PM100 PM200 Untillity Check possible maximum current of LED and laser in the data sheet Set the brightness to a low value Go to advanced mode Select the correct LED Set the wavelength in the Thorlabs software Measure the intensity at the end of the fiber with the PM100 and chose the maximum current in a way that e the maximum possible current of the light source is not exceeded AND e the output intensity is below the required limit of 10 mW or 1 mW for the invisible lasers Write the maximum brightness into the last column of the table for the laser diodes also check the minimum current that is required to get an output of 50 pW for all LEDs this minimum current is kept at 0 mA After the maximum current of each light source is set connect the fiber between input and output
14. er the zero position is found the wheel returns to the last known position and switches this light source on with the last set intensity Manual of the Anfatec Rainbow Source Rev 1 01 Page 18 22 Remote Control Remote control is possible with the LED dll Prerequisites The remote control requires The Rainbow Source software is copied to the PC e The COM port number is set correctly if required open the file COM ini as administrator to change it The LEDLamp exe was at least once called in administrator mode on this PC This creates a registry entry which is used by the DLL The registry entry tells the location of the LED ini Note This makes sure that the Rainbow Source never is operated with parameters that are either dangerous to human beings too high output power at invisible wave lengths or destructive for the Rainbow Source itself too high current applied to an LED Available functions The following procedures are defined inside the DLL _LEDSetLamp_ LED_Nr tpInteger Brightness tpDouble _LEDSetPowerlevel_ LED_Nr tpInteger tppowerLevel tpDouble _LEDGetWavelength_ LED_Nr tpInteger Output PChar _LEDGetMaxPower_ LED_Nr tpInteger MaxPower tpDouble _LEDGetAUXin_ Value tpDouble The definition is compatible with C declarations and should work with calls from MatLab SciLab Labview and user programs The arguments are declared as pointer on integer tpInteger pointer on doub
15. he software Anfatec Instruments AG assumes no responsibility for any damage or loss by deletion of data as a result of malfunction dead battery or repairs Be sure to make backup copies of all important data on other media to protect against data loss Important Please read Anfatec Licence Agreement contained in this handbook before using the accompanying software programs Using any part of the software indicates that you accept the terms of Anfatec Software Licence Agreement Manual of the Anfatec Rainbow Source Rev 1 01 Page 2 22 Introduction The Rainbow Source is a USB bus operated multiple wavelength light source equipped with 37 different light sources 28 narrow bandwidth LEDs one white LED and eight laser diodes The peak wavelengths of the light sources range from 363 nm to 900 nm The brightness of the light sources can be adjusted by software or through an external analogue signal IMPORTANT NOTICE This is a Class 2M laser device It is safe because of the blink reflex if not viewed through optical instruments The laser class 2M is defined because the laser beams exit with a large divergence for which the amount of light passing through the pupil cannot exceed the limits for class 2 For three of the laser diodes the definition of laser class 2M is critical The tool can provide dangerous light intensities at its output if the output is not coupled through a fiber or protected with a cover NEVER LEAVE THE
16. ht source or a Laser light has been selected Another possibility to select the wavelength is the slider The output light intensity can be varied with a slider in the upper part of the screen Also the light source can be switched off As there are a discrete number of available light sources with very different properties the exact wave length in nm the relating energy in eV and wave number in cm are shown on the right side of the window as well as the available maximum intensity 100 intensity Also the available maximum intensity 100 intensity is different from source to source When switching the wave length the percentage used of this maximum intensity is kept constant Example 440 nm has a 100 intensity of 2 mW and 426 nm has a 100 intensity of 0 56 mW If the intensity slider is set to 50 so that 0 28 mW are provide at the output with 426 nm and the next wave length of 440 nm is selected then the new output intensity if 1 mW 50 of 2 mW Manual of the Anfatec Rainbow Source Rev 1 01 Page 14 22 Advanced Operation Mode In advanced mode the list of light sources is shown in a table sorted by their position on the rotating wheel Select_a light source by clicking onto the text e g LED22 in the 1 row The spectrum of this source is shown in the bottom part of the screen wavel2ngta nn Stepner Posi ion Min Curen m Max Curert na v ex Biichtness rw C 572 0 30 ocz s0
17. le tpDouble or pointer on a character Pchar The calls have the following meaning _LEDSetLamp_ LED_Nr tpInteger Brightness tpDouble is used to select a certain light source and to set its brightness LED_Nr ranges from 1 to 40 Brightness is a percentage related to the available maximum power of the LED A Manual of the Anfatec Rainbow Source Rev 1 01 Page 19 22 _LEDSetPowerlevel_ LED_Nr tpInteger tppowerLevel Double sets the output intensity of the LED given with LED_Nr to the tppowerLevel LED_Nr ranges from 1 to 40 tppowerLevel is a value given in mW and returns the finally set brightness value in mW If the requested value is larger than possible maximum power then the returned value is the maximum power _LEDGetWavelength_ LED_Nr tpInteger Output Pchar This call returns the wavelength in nm or nickname of LED_Nr as Output LED_Nr ranges from 1 to 40 Output is an array of characters _LEDGetMaxPower_ LED_Nr tpInteger MaxPower tpDouble This call returns the maximum available power of LED_Nr as MaxPower LED_Nr ranges from 1 to 40 MaxPower is a float that indicates the power in mW In order to calculate the real output power the MaxPower has to be related to currently set brightness as RealPower Brightness 100 MaxPower _LEDGetAUXin_ Value tpDouble This call returns the voltage measured at the BNC input named AuxIn or Color as Value in
18. run the procedure Check Brightess to let the system specify the brightness itself Finally Save Configuration in the LEDs ini file Manual of the Anfatec Rainbow Source Rev 1 01 Page 22 22
19. stops in front of the exit slit behind the fiber coupler output En Fiber input for Photo Diode Wheel with holes for light sources D Figure 1 Drawing of the mechanical internals of the Rainbow source As most of the light sources have a quite large divergence angle the distance between exit hole and light source is kept as small as possible and the typical fiber attached from the outside has a diameter if 1 mm The spot profile at the fiber output is different for the different light sources The LED sources usually have a larger spot with a more homogeneous intensity distribution The laser diodes show a high intensity in the spot center and an in total smaller spot diameter Manual of the Anfatec Rainbow Source Rev 1 01 Page 6 22 The following images are taken on a piece of paper in 5 cm distance from the fiber end All of them are scaled similarly 650 nm laser diode 560 nm LED 405 nm laser diode 440 nm LED Additionally the Rainbow Source is equipped with a photo diode so that the intensities at the fiber end can be calibrated without an external intensity measurement tool The whole logical interface of the Rainbow Source is kept in a small Atmel chip the AT9OUSB which provides the USB communication interface to the PC some A D converters for reading an analogue photo diode signal and an auxiliary input as well as as plenty of digital I O s The digital I Os allo
20. taken from the maximum inside the acquired spectral Manual of the Anfatec Rainbow Source Rev 1 01 Page 15 22 II HI distributions For the LED sources it can vary a bit in dependence on the operation frequency while the center wavelength of the laser sources is well defined The stepper motor has exactly 200 full steps turn The light sources are distributed in constant distances to each other onto the radius of a circle Thus the distances between two light sources is exactly 5 steps There is no possibility for the user in the current version of the Rainbow Source to adjust the center position for each light source For the LEDs the minimum current is usually 0 mA because the start to emit light already at very small output currents of the constant current source The laser diodes require an offset current in order to start lasing Thus one can easily distinguish between LED and laser source in this table because all laser sources have a non zero minimum current IV The maximum current is set in a way that the maximum output intensity at the 1 m long fiber is below 10 mW light intensity or that this current does not exceed the specifications given for the selected light source Especially the LED light sources are typically specified with lower maximum supply currents e g 20 mA and do not achieve very high output intensities at these supply current V The maximum brightness is the light intensity measured with
21. tected source code has to provided with the same GPL again The license also hinders software patenting Manual of the Anfatec Rainbow Source Rev 1 01 Page 12 22 User Manual Getting Started e Connect the Rainbow Source to a USB port required before program start e Check that the USB port number and the Com ini entry are consistent not required if you always use the same USB port at your PC ay e Double click on the icon of the Rainbow Source Rainbow Source The software provides three different modes e Basic mode Init Rainbow source e Advanced Mode e Administrator mode Please wait The software always starts in the basic mode During program start the COM interface is tested If the COM port is correct the following message appears PEES Settings About Cannot open COM6 If the device is not connected please connect it and the message should disappear If the message does not disappear then the expected COM port might not be correct Please check in the device manager which COM port is used for the Rainbow Source and enter its number into the Com ini file After connecting the USB port for the first time Anfo E Note the Rainbow Source is powered up through USB port the Rainbow Source automatically Init Rainbow source searches for its home position One can hear a clicking sound as the internal wheel is turning A message appears Init Rainbow source Please wait Please
22. the maximum current at the 1 m fiber end with either the internal photo diode or an external PM100USB power meter from Thorlabs In the bottom part of the Advanced Mode screen the spectra of the selected LED are shown Relative Intensty 200 300 430 50 620 730 30 b 1k Wavelencth itr These spectral distributions are characterized at the fiber end with a simple Thorlabs spectrometer CCS200 They are stored as numbered csv files in the data directory For example the csv file for LED number 3 is found as C Program Files Anfatec RainbowSource bin Data 3 csv Manual of the Anfatec Rainbow Source Rev 1 01 Page 16 22 External Brightness Control For external brightness control a BNC connector Brightness is available It is ac coupled and allows a modulation between 10 Hz and 200 kHz higher frequencies have not been tested The following Figure shows the frequency dependence of the modulation detected with 500 MV ims 1 0E 01 2 oS lt Cc J ke E O1 0E 02 _ 1 0E 02 1 0E 03 1 0E 04 1 0E 05 Frequency kHz Figure 3 Frequency dependence of the modulated light intensity at the output measured with a lockin amplifier Parameters 10 Hz to 250 kHz 10V input range time constant 10 f synchronized 100 data points The average output current of the used LED was set to 35 mA This current modulation is measured as voltage over a 10 Ohm resistor and the vertical
23. w to selected the light source and provide a pulse width modulated signal that enables the brightness adjustment List of LED s and lasers The Rainbow source offers 40 different positions for light sources Not all of them are used Three out of four positions are reserved for LEDs and every 4 position on the wheel is reserved for a laser diode The ordering of the LEDs and laser diodes versus wavelength is not fully realizable on wheel Thus there are two lists of light sources available In the advanced mode the sources are ordered by position on the wheel Position 2 6 10 14 18 22 26 and 30 are occupied by laser diodes The positions 34 38 and 40 are not used In all other positions one finds a narrow band width LED In Basic mode the user finds a list of light sources versus wave length The full list of light sources and their corner properties is given in Table 1 Manual of the Anfatec Rainbow Source Rev 1 01 Page 7 22 No Type Wavelength Position Min Current Max Current Max Intensity nm steps mA mA mW LED1 900 0 0 50 0 34 LED2 Laser 980 5 8 13 1 05 LED3 764 10 0 50 0 9 LED4 718 15 0 20 0 19 LEDS 706 20 0 50 0 39 LED6 Laser 850 25 9 35 0 91 LED7 701 30 0 50 0 4 LED8 652 35 0 20 0 09 LEDS 647 40 0 20 0 16 LED10 Laser 830 45 14 25 1 66 LED11 638 50 0 20 0 21 LED12 634 55 0 20 0 32 LED13 610 60 0 20 0 03
24. wait A short knocking sound indicates that the home position is found and the last set light source is selected automatically with the last set intensity Menu entries The menu entry About lead to an about window which shows Settings About Normal Modus U v Advanced Modus Manual of the Anfatec Rainbow Source Rev 1 01 Go Home the current software version and the serial number if the Rainbow Source attached to the PC In Settings one can switch between the basic mode and the advanced operation mode The function Settings Go Home drives the Rainbow Source into its home position and returns to the last selected LED Basic Operation Mode oix Settings About power detected at AuxIn voltage display AUXin 0 082 Photodiode 0 251 mw photo diode selected wavelength Brightness brightness On Off C off fa Ol a earl ie Meade brightness slider ena gt 100 OF Wis HQNt Source mee oe ai gt colo selection slider wavelength of Fom l a selected wave length selected light source 701 nm in different units Figure 2 Screen shot in Basic Mode with explanations Figure 2 shows the initial screen that appears after program start In order to adjust the color use the drop down list in the bottom part of the window It is sorted by the wave length of the emitted light Here its not possible to see whether an LED lig
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