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Laser measurement of the LAT detector displacement

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

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Laser measurement of the LAT detector displacement

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

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

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

  4. Camera picture (old)

  5. Camera picture (new)

  6. Position measurement

  7. Result of the first measurements • Coefficient: 0,12727pixel/mm • Resolution 1mm if the accuracy of determination of the centre of the light spot is better than 0.1pixel

  8. Centre of spot calculation algorithms • Cuts on different levels • Whole frame, part of the frame • Constant amount of light in the peak

  9. Centre of spot, x position

  10. Centre of spot, y position

  11. x and y position

  12. X distance

  13. Difference from fit

  14. Conclusions • Problems with micrometric movement, • Non perpendicular beam,

  15. To be done • Small-pixel camera, CCD technical data, • Manually controlled sensitivity, BW camera, • Semiconductor laser, • Piezoelectric movement of camera, • Independent measurement of displacement, • Multiframe statistics.

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