Apparatus for spectrometer alignment

Details Apparatus for spectrometer alignment Apparatus for spectrometer alignment

G - Physics

01

N

73/55

G01N 21/31 (2006.01) G01J 3/453 (2006.01) G02B 27/00 (2006.01)

Patent

CA 1114193

ABSTRACT A Fourier transform spectrometer in which an alignment system is provided for keeping the moving mirror accurately parallel to its original orientation. A reference laser beam is supplied to the spectrometer and if the moving mirror tilts to become out of parallelism then bars appear in the output field, Three detectors arranged at the vertices of a right-angled triangle detect such bars and provide error signals to a mirror control system. The detectors also receive spurious signals caused by stray reflections at the beamsplitter-compensator plate. By providing a square- shaped reference beam which is masked by an L-shaped opening such spurious signals are eliminated.

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