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Entry  Tue Jun 19 14:08:37 2018, pooja, Update, Cameras, CCD calibration using LED1050E 
    Reply  Wed Jun 20 20:39:36 2018, pooja, Update, Cameras, CCD calibration using LED1050E 
Message ID: 13986     Entry time: Tue Jun 19 14:08:37 2018     Reply to this: 13991
Author: pooja 
Type: Update 
Category: Cameras 
Subject: CCD calibration using LED1050E 

Aim: To measure the optical power from led using a powermeter.

Yesterday Gautam drilled a larger hole of diameter 5mm in the box as an aperture for led (aperture angle is approximately 2*tan-1(2.5/7) = 39 deg). I repeated the measurements that I had done before (https://nodus.ligo.caltech.edu:8081/40m/13951). The measurents of optical power measured using a powermeter and the corresponding input voltages are listed below.

Input voltage (Vcc in V) Optical power
0 (dark reading) 0.8 nW
10 1.05 mW
12 1.15 mW
15 1.47 mW
16 1.56 mW
18 1.81 mW

So we are able to receive optical power close to the value (1.6mW) given in Thorlabs datasheet for LED1050E (https://www.thorlabs.com/drawings/e6da1d5608eefd5c-035CFFE5-C317-209E-7686CA23F717638B/LED1050E-SpecSheet.pdf). I hope we can proceed to BRDF measurements for CCD calibration.

Steve: did you center the LED ?

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