Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1975-12-18
1977-10-11
Clark, Conrad J.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
356110, G01B 902
Patent
active
040532313
ABSTRACT:
An interferometer having servo means for automatically adjusting the angular tilt of a reflecting surface in one of two paths to maintain the exit beams from the two paths parallel to each other. Three detectors at the output of the interferometer are disposed on mutually perpendicular axes which define a plane normal to the nominal exit beam axis. One detector at the origin of the axes is used as a reference for separate phase-difference comparison with the outputs of the other two detectors on the X and Y axes to develop servo error signals.
REFERENCES:
patent: 3253223 (1966-05-01), Kettel
patent: 3563664 (1971-02-01), Campbell et al.
patent: 3729261 (1973-04-01), Sandercock
patent: 3796494 (1974-03-01), Takabayashi
Ashley et al., "27.Fourier Spectroscopy Applied to Field Measurements" Special reports No. 114, Aspen International Conference on Fourier Spectroscopy; Jan. 5, 1971.
Fletcher James C. Administrator of the National Aeronautics and Space
Schindler Rudolf A.
Clark Conrad J.
Manning John R.
McCaul Paul F.
Mott Monte F.
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