Measuring Scattering Off LHO Test Masses Christian Pluchar Mentor: - PowerPoint PPT Presentation

Sep 21, 2022 •225 likes •426 views

Measuring Scattering Off LHO Test Masses Christian Pluchar Mentor: Keita Kawabe LIGO Test Mass Scattering Optics Diagram from GWoptics.com, (https://www.gwoptics.org/finesse/examples/aligo_s ensitivity.php.) Camera Cartoon from:

Measuring Scattering Off LHO Test Masses Christian Pluchar Mentor: Keita Kawabe
LIGO Test Mass Scattering Optics Diagram from GWoptics.com, (https://www.gwoptics.org/finesse/examples/aligo_s ensitivity.php.) Camera Cartoon from: https://www.vexels.com/png-svg/preview/139838/ca mera-cartoon
Camera Calibration and Image Sensors -Photosensitve semiconductors -Counts ~ Photons absorbed -Each of the pixel is made of 4 individual subpixels -Bayer filter -Calibration: Counts / (unit energy) Image from HowStuffWorks: (http://s.hswstatic.com/gif/digital-camera-bayer.jpg)
Experimental Setup
Experimental Setup
Camera Calibration -Varied shutter speed and power incident on the sensor -Used RAW camera files -Kept ISO constant -Ambient light subtraction
Calibration Results, 1064 nm
Calibration Results Standard Deviation of the Laser Wavelength (nm) Color Slope (Counts/Joule) fit 1064 Red 1.61E+16 9.32E+13 1064 Green 1.45E+16 8.26E+13 1064 Blue 1.65E+16 9.52E+13
Measuring Test Mass Scattering
Measuring Test Mass Scattering ITMx, 30s exposure ETMx, 1s exposure
Measurement Limitations Addressed: -Ambient light from other lasers -Camera electronics noise (read noise) -Dynamic range -Saturated Pixels Not Addressed: -Nonuniform scattering
Ambient Light Subtraction ETMx Background, 20s
Read Noise
Read Noise
Read Noise
Dynamic Range 1 second exposure 1/40 second (still saturated)
Extending the Dynamic Range
Results My results: ETMx: 10 watts/steradian @ 10.6 degrees ITMx: .0142 watts/steradian @ 1.52 degrees From Vincent Roma (T1600085), using photodiodes: ETMx: 3.68 watts/steradian @ ~10 degrees ITMx: 42.22 watts/steradian @ ~1.5 degrees
Thank You

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