Intensity Noise and Angular Distribution Measurements in LED Selection
NAOJ VIS Meeting, April 29
nd
, 2014
Results from OSEMs last November (1/2)
LIGO papers have shown that OP232 LED intensity noise varies from batch to batch
Results from OSEMs last November (1/2)
In addition, LIGO papers show different angular distribution
and peak locations for different LEDs
Measurement set-up
Determined with the first (!) fully assembled
OSEM what current to run the LED, now with
collimator, to have -12V on U
TIA
output:
R
s,LED
= 300
U
LED
= 8V
I
LED
≈ 25mA
For fast comparative measurement, LED is run
in a simple set-up at 25 mA and ASD on the
U
TIA
signal is taken
First, a dependence of intensity noise on the
LED intensity magnitude is investigated
Intensity noise LED current dependence
Intensity noise first batch of LEDs
Comparison between batches
Measurement set-up
OSEM optics
Replace for trans-
lation stage
The measurements focus on intensity noise and angular distribution to address variations in LED performance observed in LIGO papers. The study aims to investigate intensity noise dependence on LED current, differences between LED batches, and comparisons between them.
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Presentation Transcript
Reasons for these measurements Intensity noise measurement Angular distribution measurement OSEM LED Selection Measurements: Intensity Noise and Angular Distribution NAOJ VIS Meeting, April 29nd, 2014 J.V. van Heijningen (jvnheijn@nikhef.nl) 1|8
Results from OSEMs last November (1/2) Reasons for these measurements Intensity noise measurement Angular distribution measurement LIGO papers have shown that OP232 LED intensity noise varies from batch to batch J.V. van Heijningen (jvnheijn@nikhef.nl) 2|8
Results from OSEMs last November (1/2) Reasons for these measurements Intensity noise measurement Angular distribution measurement In addition, LIGO papers show different angular distribution and peak locations for different LEDs J.V. van Heijningen (jvnheijn@nikhef.nl) 3|8
Measurement set-up Reasons for these measurements Intensity noise measurement Angular distribution measurement Determined with the first (!) fully assembled OSEM what current to run the LED, now with collimator, to have -12V on UTIA output: Rs,LED= 300 ULED= 8V ILED 25mA For fast comparative measurement, LED is run in a simple set-up at 25 mA and ASD on the UTIAsignal is taken First, a dependence of intensity noise on the LED intensity magnitude is investigated J.V. van Heijningen (jvnheijn@nikhef.nl) 4|8
Intensity noise LED current dependence Reasons for these measurements Intensity noise measurement Angular distribution measurement J.V. van Heijningen (jvnheijn@nikhef.nl) 5|8
Intensity noise first batch of LEDs Reasons for these measurements Intensity noise measurement Angular distribution measurement J.V. van Heijningen (jvnheijn@nikhef.nl) 6|8
Comparison between batches Reasons for these measurements Intensity noise measurement Angular distribution measurement J.V. van Heijningen (jvnheijn@nikhef.nl) 7|8
Measurement set-up Reasons for these measurements Intensity noise measurement Angular distribution measurement Lens (f = 8mm) LED CCD Camera J.V. van Heijningen (jvnheijn@nikhef.nl) 8|8
