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Autocollimator Calibration

Autocollimator Calibration . Calibration : interpretation of output from Autocollimator Controller . What we have: Output from controller i.e. numbers that quantify the lateral displacment ( Δ x, Δ y) caused by tilts in arbitrary unit. What we search:

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Autocollimator Calibration

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  1. Autocollimator Calibration Calibration : interpretation of output from Autocollimator Controller What we have: Output from controller i.e. numbers that quantify the lateral displacment (Δx, Δ y) caused by tilts in arbitrary unit What we search: A coefficient that transform the lateral displacment arbitrary unit in µm

  2. Autocollimator Calibration The idea

  3. Autocollimator Calibration Generate a tilt of a known angle Response spring Rotating rail Micrometric translation Micrometric translation stage + Rail arm = Known angle autocollimator

  4. Autocollimator Calibration Procedure Step of T.S. 20 μm Min angle Δθ = 0,0571 mrad i.e. Δy=100 a.u. read  Δy = 56.5 μm Lateral displacement Δy = 32 µm Average Δy read 74 measure of 20 μm step Δy = 56,783 a.u. Why this error?

  5. Autocollimator Calibration Focal length Rail length Positioning (per step) Data Acquisition (per step) Average on100 meas St. dev. on 100 meas Difference between the two Y values Shift Angle Linear Shift Average of Conversion Coeff Difference between the two next angles

  6. Autocollimator Calibration Next Step + Reduce Min. angle Δθ Improve Accurancy • Using Exapod • Using Theodolite+ large mirror

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