Product Note P9 ModuLight User Guide
Contents
1. To invert the transfer function to X Y select Admittance Y instead of Impedance Z in the software Ivium Technologies O P9 10 6 Example 1 Solarcell IMPS Intensity Modulated Photocurrent Spectroscopy The IMPS technique measures the transfer function between modulated light intensity and the resulting AC current generated by the cell To run this technique Select from the method tree Impedance Constant E Activate advanced method parameters Set parameter MeasConfig to INT ac E With this parameter setting the internal applied AC signal is used as Y light intensity and the photo current is used as X IMPS Y X light intensity photo Current AC intern I we This potentiostat s dc potential may be set to short circuit conditions E20 but it may also be made at for example the maximum power point or Eoc I 0 Note that the potentiostat s DC potential may be set to short circuit conditions E20 but it may also be operated at other settings for example maximum power point or E oc I20 Example 2 Solarcell IMVS Intensity Modulated Photovoltage Spectroscopy The IMVS technique measures the transfer function between modulated light intensity and the resulting AC voltage generated by the cell To run this technique Select from the method tree Impedance Constant I Activate advanced method parameters Set parameter MeasConfig to INT_ac I With this parameter setting the internal appl2. way as in the direct mode operation see paragraph 3 Modulation cannot be applied while performing a DC sweep only during EIS If an AC modulation was selected under the Direct Mode tab it will simply switch off during the DC sweep However note that sweep measurements incorporating pulsed modulation of the light amplitude can be achieved using Mixed Mode by segmenting the sweep into levels and having different values of the analogue output in each sweep level Ivium Technologies O P9 10 5 5 Measurement signal configuration AC transfer function Standard electrochemical impedance is determined from measurements of the AC current and AC potential at the instrument s cell connectors A standard impedance Z sweep is derived from E I where the Y input signal is E voltage and the X input signal is I we current at the working electrode In the table 2 below this situation is given in line 0 MeasConfig standard However with Ivium potentiostats IviumSoft it is possible to select other signals for the X and Y inputs In the Impedance techniques the advanced method parameter MeasConfig is available This parameter allows various signals to be used for the X and Y inputs These signals can then be plotted in the impedance Result graph as if these were I we and E respectively Table 2 below shows alternative choices which are accessible in IviumSoft from the MeasConfig parameter in the Impedance techniques Advanced mode onl
3. controlled via the Analog AE 1000 V output1 This output has a range of 0 4V which quem corresponds to a light output of 0 100 of the full output ch2 0000 V power For example enter 1V into the ch1 field and click on chi This will result in a light output of the chosen colour corresponding with 25 of full drive current Digital output Digout1 Digout2 Dig out 3 AC Modulation The AC modulation of the light is controlled via amp c signal the AC output of the peripheral port The AC output is accessed in IviumSoft from the AC tab which is found under the Direct control menu tab Frequency 9 Hz Amplitude n500 V The rate of modulation is controlled by the Frequency setting An AC amplitude setting of 0 1V corresponds to a modulation of 0 100 of the full output power which is added to the selected dc power Examples 1 Set DC Voltage Analog output ch1 2V click Ch1 Set AC Voltage AC signal Amplitude 0 500V Set Frequency AC signal Frequency 2Hz click Apply Now the light will start modulating between 100 intensity and 0 intensity at the chosen frequency of 2 Hz The 2V DC sets the light amplitude at 50 of maximum drive current then 0 5V AC adds a modulation intensity of 50 of full output current and so the combined signal oscillates between full output power and zero T The DC intensity Analog output1 can also be controlled di
4. currents 0 1Hz to 1kHz at fixed light intensities of 60Ilm left to right OMA OCP 1mA 3 mA Ivium Technologies O P9 10 11 ms DSSC at variable DC bias F F mS Photo electric admittance of DSSC at various DC bias at fixed light intensity of 60 m left to right 0 7V 0 6V 0 0V IMPS ms DSSC at 0 6V F F mS Photo electric admittance of DSSC at 600mV DC at various light intensities left to right 15Ilm 30lm 60m Ivium Technologies O P9 10 12 7 Ivium ModuLight Photometry Luminous Flux The applied LED series is adapted to the so called luminous efficiency function This function describes the average sensitivity of the human eye to light at different wavelengths This means that to obtain a relatively equal light output at different wavelengths the radiant power will vary The relationship between luminous and radiant intensity can be described as Lr 683x IXY 7 0 8 l Luminous Intensity in Lm I Radiant Intensity in 4 Ya Luminous Function Sr Steradium T 400 500 nm 600 700 Luminous efficiency function Luminous Intensity In the graphs in paragraph 8 and 9 the relative light output 96 as a function of the driving current is given for each of the LEDs used in the ModuLight 0 mA corresponds to 0 light 1000mA corresponds with 100 relative light output In the ModuLight the LED intensity is controlled via the setting of Analog output 1 linear from 0 4V The setting o
5. 00 Wavelength nm 1000 1050 e e Relative Spectral Power c c gt un c 750 Wavelength nm oo o ow oo a 0 5 o D Relative Spectral P o w 0 2 550 Wavelength nm 17 10 Luminous Efficacy Tables 1700 lumens per watt T Eeotopie vision cnr mrimpied EDT nm Scotopic Photopic Scotopic p Luminous P Conversion Efficac Conversion Im W 7 V V Im W 1500 t B son wo we a M 600 0 631000 430 973 0 033150 56 355 660 0 061000 41 663 0 000313 0 532 690 0 008210 5 607 0 000085 0 060 Source Table 6 1 of Williamson amp Cummins Light and Color in Nature and Art Wiley 1983 The Photopic conversion Im W is obtained by multiplying VA by 683 and the Scotopic conversion is obtained by multiplying V A by 1700 as suggested by those authors Photopic Wavelength Luminous Efficacy J 593 lumens INV IBJIVI WWW ivium com Ivium Technologies O P9 10 18
6. A 140 1 0 9 120 o8 Is o 100 07 C a 8 s 06 o 80 g 05 o o a 60 o 04 g Z E S 03 o 40 g x 0 2 20 0 1 o LL LLL O 200 400 600 800 1000 1200 1400 1600 400 450 500 550 600 650 700 le Forward Current mA Wavelength nm Ivium Technologies O P9 10 14 Red 623nm 140 160lm 01A N e 8 8 8 Relative Light Output 96 0 200 1000 1200 1400 1600 400 600 800 le Forward Current mA Deep Red 660nm 900mW Q1A 1 4 0 8 o o e rs Normalized Radiant Flux 0 2 1000 0 250 500 750 le Forward Current mA 705mW 1A Normalized Radiant Flux 0 250 500 750 1000 1250 1500 l Forward Current mA Ivium Technologies O P9 10 Relative Spectral Powe Relative Spectral Power Relative Spectral Power 400 450 500 550 600 650 700 400 450 500 550 600 650 700 Wavelength nm 15 9 LED specifications Optional Cool White 5500k 227lm 1A 140 120 109 amp 6 80 f o 3 60 g E 40 20 0 0 200 400 600 800 1000 1200 1400 1600 le Forward Current mA Warm White 3000k 180lm 1A 140 120 100 80 60 40 Relative Light Output 96 20 0 200 400 600 800 1000 le Forward Current mA 1200 1400 1600 Violet 400nm 1 4 1400mW QG 1A Norm
7. LED emitter provides superior radiometric power in the wavelength range specifically required for dental curing light applications Table 1 Wavelength specification specification subject to change as LED technology progresses Light intensity Bias resolution Wavelength Power Bandwidth Light aperture Power requirements Size Weight Interfacing connectivity Use 2 Installation can be modulated with the FRAoutput of the build in sinewave generator of the IviumStat CompactStat from 10 uHz to 2 MHz 16 bit 0 0015 set programmatically 460 740 nm in 7 steps 0 1430 mW depending on LED 0 gt 2 MHz circular d 34mm 9 08cm2 external adapter 100 240 V 45 65 Hz at DC connector 5V 1A wxdxh 12x13x2 5cm 0 5 kg DB37 connects to the potentiostat peripheral port D Sub 15pins only i c w Ivium potentiostats Connect the ModuLight to the potentiostat using the cable that is included with the instrument Insert the connection cable into the SD37connector at the back of the Modulight and the other end into the peripheral port connetor of your potentiostat The SD37 SD37 cable connects the ModuLight to the IviumStat and CompactStat The SD37 SD15 cable connects the ModuLight to the Vertex s and sModule The HD15 connector at the front of the Modulight is intended for the connection of the light intensity meter This Ivium product will be available soon Insert the external 5V power adapter The ModuLight is now r
8. Product Note P9 ModuLight User Guide The ModuLight module is a programmable light source that has been designed to investigate photo electrical devices such as solar cells The add on module will operate in combination with Ivium potentiostats through the peripheral I O port The ModuLight by default contains 7 LEDs with wavelengths ranging from 460 740 nm On request LEDs can be exchanged for others from the same product range see table below During operation an LED can be programmatically selected The sinewave generator of the potentiostat can then be used to modulate the intensity of the LED with a frequency of 10uHz 2MHz The extensive Solar cell applications that are included in the Ivium software allow a full characterization of the solar cell The functionality includes E I curves as function of the light intensity IMVS IMPS and solar cell modelling resulting in all characteristic values of the studied object Ivium Technologies O P9 10 1 1 Modulight specifications Mode Color 1 Cool White Blue Green Amber Red Deep Red Far Red NO Un B WN Cool White Violet UV IR IR Wavelength Power Intensity Digital Code nm mW Im 6500 K 250 Im IIO 460 40 Im IOI 523 200 Im IOO 590 105 Im OII 623 160 Im OIO 660 900 mW OOI 740 705 mW OOO 5500 K 250 Im Optional 405 1400 mW Optional 365 1470 mW Optional 940 1150 mW Optional 850 800 mW Optional 460 1100 mW Optional Dental Blue Dental Blue
9. alized Radiant Flux 400 l Forward Current mA 1120mW QG 1A Normalized Radiant Flux 0 200 400 600 800 Forward Current mA 1000 1200 Ivium Technologies O P9 10 o O o o C e D o B Relative Spectral Power o o Co on o M E S eo 350 400 450 500 550 600 Wavelength nm 650 700 750 800 Relative Spectral Power 380 430 480 530 580 630 680 730 780 830 880 Wavelength nm Relative Spectral Power Wavelength nm 300 325 350 375 Wavelength nm 425 450 16 IR 940nm 14096 12096 2 8 8 S S 0 200 Normalized Radiant Flux S 3 amp R S R R Dental Blue 460nm 1 4 12 1 1150mW 1A 400 600 800 Forward Current mA 1150mW 1A 400 600 800 Forward Current mA 1000 1000 1200 1200 1100mW 1A 0 8 0 6 0 4 Normalized Radiant Flux 0 2 0 200 Dental Blue LED emitter provides superior radiometric power in the wavelength range specifically required for 400 600 800 1000 l Forward Current mA dental curing light applications Ivium Technologies O 1200 1400 1600 P9 10 o o e gt Relative Spectral Power e in 650 850 9
10. eady for operation using the IviumSoft software The test object solar cell can be connected to the cell cable and illuminated with the ModuLight The operation of the ModuLight is independent of its position i e the ModuLight can be placed under on top to the side etc of the test object At the bottom of the ModuLight a screw socket is available to put the ModuLight on a common camera stand Ivium Technologies P9 10 2 3 Direct operation The ModuLight can emit a modulated light flux of 6 different wavelengths and 1 wavelength spread white using 7 different LEDs as light source The present specifications of each wavelength are given in table 1 above Wavelength Selection Analog output The wavelength LED can be selected by using the 3 digital chi 0000 V outputs of the peripheral port The digital codes are given in table 1 Note that these codes are according to the electronic ch2 0 000 V standards i e counting from right to left The digital outputs can be accessed in the IviumSoft from the Direct tab in the Digital output 1 Extern tab below As an example to choose the color Dig out 1 white the digital code is IIO This means that Dig out 3 v Dig out 2 and Dig out 2 need to be checked and Dig out 1 is M Dig out 3 unchecked DC Intensity Analog output The DC intensity of the light is
11. f OV corresponds to a driving current of 0 mA 4 V corresponds to a driving current of 1000mA Example Using a the RED LED 623nm 260Im W output 160lm at 100 setting OV will give O light setting 4V will give 100 light 1000mA corresponding with 160lm or 615mW 160 260 For 50 light output a driving current is needed of ca 430mA see also graphs in paragraph 8 and 9 To achieve 50 a setting of 1 72V 4V 0 430 1 is required corresponding with 80Im or 307 5mW or 80 260 Ivium Technologies O P9 10 13 8 LED specifications Default configuration Cool White 6500k 120 200Im 1A 100 x z 80 i 8 60 i S 40 t E E 20 0 0 200 400 600 800 1000 1200 1400 I Forward Current mA 400 450 500 550 600 650 700 750 800 Wavelength nm Blue 460nm 40lm Q 1A 140 1 0 9 120 S _ 08 100 07 a 5 5 0 6 o 80 S 0 5 3 60 a o E 0 4 G Bo E 40 9 0 3 0 2 0 1 0 0 0 250 500 750 1000 1250 1500 400 450 500 550 600 650 700 Ic Forward Current mA Wavelength nm Green 523nm 200lm 1A 140 120 e 5 100 z 5 a E 6 80 5 gt a 60 o o 2 E L E Z 20 eo 0 200 400 600 800 1000 1200 1400 1600 400 450 500 550 600 650 700 le Forward Current mA Wavelength nm Amber 590nm 105lm Q 1
12. ied AC signal is used as Y light intensity and the photo potential is used as X IMPS Y X photo potential light intensity E AC intern Note that the galvanostat current may be set to OCP conditions I20 but it may also be made at for example the maximum power point 6 There are no universal standards for display of IMPS and IMVS If the inverse ratio is required then Admittance Y should be selected for display within IviumSoft Ivium Technologies P9 10 7 6 Experimental example Experiments were conducted with a 1cm Dye Sensitized SolarCell DSSC The solarcell was connected to an Ivium CompactStat with WE S to the positive pole and CE RE to the negative pole a negative current means that the solarcell is producing power As light source the Ivium ModuLight module was used with the 635nm setting connected to the CompactStat peripheral port s AnalogOut1 for DC intensity and ACout for AC intensity modulation The DC LSV scans were done by first setting the illumination level with AnalogOut1 in the Direct Mode and thereafter performing a scan The DC experiments with pulsed light were done with the Mixed Mode technique the the Anout1 parameter of the 2nd level was used to set the desired light intensity The EIS scans were done by first setting the bias illumination level with AnalogOut1 in the Direct Mode tab and thereafter performing an EIS scan with MeasConfig parameter to Int AC E for potentios
13. rectly from within some methods Mixed Mode and as a Direct command from Batch Mode See paragraph 7 Ivium Modulight Photometry See paragraph 7 Ivium Modulight Photometry Ivium Technologies P9 10 3 2 Set DC Voltage 3 6V 90 of max power Set AC Voltage 0 1V 10 of max power Set Frequency AC signal Frequency 100Hz This produces a modulation between 80 of full on and 100 of full on with a dc offset power at 90 of full on at a frequency of 100Hz 3 Overdriving to non linearity not recommended DC Voltage 4V 100 of max power AC Voltage 0 05V 5 of max power This produces a modulation between 95 intensity and 100 intensity Because more than 100 intensity is not possible the first half of the sine wave will modulate between 95 and 100 the second half of the sine wave will yield 100 This could produce a non linear modulation and is not recommended Note1 When controlling the ModuLight from the direct mode it should be taken into account that communication between PC and Ivium device only takes place once per second This means that there may be a delay of up to one second before a change takes effect Note2 The peripheral port signal output depends on the Ivium instrument type I e when the Plus module option is checked the AC output signal is a factor of 5 33 lower than the set value when the E extended range option is checked the AC output signal is a factor of 2 lower than the se
14. t value This means that in these cases the amplitude of the light intensity variation is equally less If this is an issue please contact Ivium Technologies for a solution Note3 Due to the non linear nature of the LED light output as a function of the driving current the DC voltage control 0 4V also shows a non linear control function 4See paragraph 7 Ivium Modulight Photometry Ivium Technologies P9 10 4 4 Running a Method 4 1 Single method A single method can be run by first setting the desired parameters of the ModuLight such as wavelength and intensity in the Direct mode tab see paragraph 3 Then in the Method mode tab a method can be run For example to measure an E I curve of a solar cell set the desired wavelength Digital outputs and intensity DC Voltage Ch1 then the E I curve can be measured using the linear sweep method To run an impedance measurement the ModuLight parameters such as wavelength and DC intensity need to be set first in the Direct mode tab In the Method mode tab select the desired impedance technique for example Constant E Then activate the Advanced method now the MeasConfig is available in the parameter list The MeasConfig parameter determines how and which signals are recorded and shown in the graph see also paragraph 5 4 2 Automated methods Batch mode In is possible to run several methods successively in the BatchMode In between methods it is possible
15. tatic scans and Int AC I for galvanostatic scans The applied frequency range was 10kHz to 0 1Hz mA DSSC E l curve Current Potential V E I curves for DSSC at various light intensities 15lm 30lm 60 m Ivium Technologies O P9 10 8 Solar cell analysis Select model basic model Solar Cell Modelling include Rs Rp Parameters Cell area 1 0 E Light intensity 10 Wm Copy result Rp 3357 5799 Ohm Potential Solar cell analysis Select model basic model Solar Cell Modelling include Rs Rp Parameters Cell area 1 0 m2 Light intensity 10 wim Copy result Potential Screenshot of the solarcell modelling circuit using the 60lm intensity curve Ivium Technologies O P9 10 DSSC at OCP 0 200 400 600 800 time Open Cell Potential of DSSC for variable intensity light pulses mA DSSC at OV III l e mama RTI Current EOC CCEEEEECCCECECECCCCCC 0 100 200 300 400 500 time Current response of DSSC at Estat OV for variable intensity light pulses Ivium Technologies P9 10 Potential ms Potential ms 10 enm DSSC at OCP a kohm IMVS photo electric impedance of a DSSC at OCP at various light intensities left to right 15lm 18lm 23lm 30lm ohm DSSC at constant current E ohm Photo electric impedance of a DSSC at various constant
16. to change the wavelength light colour and DC intensity of the ModuLight To do this add a DirectCommand line in the appropriate place in the batch program When this line is selected in the Line properties the wavelength can be chosen by ticking the SetDigOut box The boxes for the individual digital outputs become available and by ticking the relevant boxes the wavelength can be chosen In the same way ticking the SetDAC box will make the analog outputs available Inserting the desired value in the DAC 1 field Analog output 1 ch1 will set the intensity of the light Mixed mode In the transient technique MixedMode a sequence of operations can be programmed in in the method parameter Stages pop up In the Properties for Level at the bottom of the list the following parameters allow operation of the ModuLight o AnOuti when ticked a value can be entered from 1 4 V which determines the DC intensity of the light from 0 100 in the same way as in the direct mode operation see paragraph 3 o Digouts when ticked an integer value can be entered to select the wavelength This integer corresponds to an 8 bit conversion for the digital outputs i e 0 000 2 Far Red 6 110 Cool White o The AC modulation of the light can be controlled by ticking the Record ac box In the main method parameters the modulation Frequency Hz and AC amplitude can be set amplitude O 1V corresponding with O 100 intensity in the same
17. y For the Modulight the relevant choices are lines 0 1 and 2 BOLD corresponding with standard INT ac I and INT ac E Table 2 MeasConfig X Y remarks 0 standard I we E 1 INT acI ac intern E Internal DSG not applied 2 INT acE I we ac intern Internal DSG not applied 3 EXT ac EI X periph Y periph 4 EXT acI X periph E 5 EXT acE I we Y periph 6 EXT IINT E X periph ac intern 7 EXT EINTI ac intern Y periph 8 DirectE I we E CE as reference instead of RE S 9 DirectE INT I ac intern E CE as reference instead of RE S 10 DirectE EXT I X periph E 11 BiStat I we I we2 12 EXT I BiStat X periph I we2 In the table I we and E Are generated or measured as usual via the potentiostat cell connector AC intern Is the internally generated FRA ac signal applied via the peripheral port connector AC out in the pin out in the instrument manual It drives the ModuLight AC intensity Internal DSG not applied Signifies that the Internal Direct Signal Generator is not applied so no AC perturbation is carried through to the E and I we signals these are DC signals only When measuring impedance the IviumSoft always defines this as Y X so for standard impedance Z this would be E I we in the table above When other signals are used for Y and X the data is still displayed as impedance Z E I by the software however it is actually a transfer function which is defined by the MeasConfig selection and the user must interpret the data
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