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Laser measurement of the LAT detector displacement

Laser measurement of the LAT detector displacement. Jerzy Zachorowski Instytut Fizyki UJ Wojciech Wierba Instytut Fizyki Jądrowej PAN. Optical measurements of detector position. Precision requirement: sub- m m transverse 10 m m axially. Optical sensors non-contact measurements.

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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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