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Laser measurement of the LAT detector displacement

Explore laser and optical measurement techniques for LAT detector displacement at sub-mm transverse and 10 mm axial precision. Utilize various sensors including interferometers and photonic detectors. Implement position sensitive photodiodes and CCD matrices for x, y, z tracking. Overcome challenges such as color camera usage, detector saturation, and pixel size for accurate results. Enhance system reliability with synchronized exposure and readout.

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Laser measurement of the LAT detector displacement

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  1. Laser measurement of the LATdetector displacement Jerzy Zachorowski Instytut Fizyki UJ Wojciech Wierba Instytut Fizyki Jądrowej PAN

  2. Optical measurements of detector position • Precision requirement: sub-mm transverse 10 mm axially. • Optical sensors non-contact measurements.

  3. Possible axial displacement sensors • Interferometers:resolution l/2 or better (down to nm), require continueous illumination, • Triangulation detectors:resolution mm, working distance cm • Photonic detectors:mm-resolution, minimal working distance

  4. Position sensitive detectors • Position sensitive photodiodes • CCD (Charge Coupled Device) Matrices • Two detectors allow x,y,j tracking

  5. Transverse position • Simple CCD camera, • He-Ne red laser, • Laser translated in 50 mm steps Proof-of-principle measurements

  6. Camera pictures

  7. Problems • Color camera instead of B&W • Saturation of the detector • Big pixel size • Large beam

  8. Position measurement

  9. Result • Coefficient: 0,12727pixel/mm • Resolution 1mm if the accuracy of determination of the center of the light spot is better than 0.1pixel • Possible!

  10. To be done • Small-pixel camera, • Picture analysis algorithm, • Micro pointing stability of lasers, • Laser MTBF, • Two lasers? System reliability, • Exposure and readout synchronization.

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