Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1988-08-31
1989-09-12
Scott Jr., Leon
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356350, 35616217, G01B 902
Patent
active
048654523
ABSTRACT:
A beam combiner assembly for a ring laser gyroscope is fabricated by positioning two diffraction gratings, mounted onto respective light transmissive substrates, with respect to the output mirror of the gyro block at an offset angle such that an interference fringe pattern is projected onto the photodetector of the ring laser gyroscope. By tilting the diffraction gratings, with respect to the plane of the output mirror, a corrected number of lines per unit length for the diffraction gratings may be effected, thereby providing a beam combiner assembly which is compensated for manufacturing imperfections and other intolerances. Also, the high sensitivity of angular adjustments for the conventional prism beam combiner is overcome.
REFERENCES:
patent: 34377 (1987-04-01), Ljung
patent: 4477188 (1984-10-01), Stiles et al.
patent: 4677641 (1987-06-01), Dodgorsky
patent: 4783170 (1988-11-01), Bergstrom
Journal of Optical Society of America, vol. 73, No. 9, pp. 1113to 1118, Sept. 1983, "High-Frequency Holographic Transmission Gratings in Photoresist" by R. C. Enger and S. K. Case.
Journal of Applied Optics, vol. 23, No. 14, pp. 2302 to 2310, July 15, 1984, "Dielectric Surface--Relief Gratings with High Diffraction Efficiency" by Kyoshi Yokomori.
Journal of Applied Optics, vol. 23, No. 18, pp. 3214 to 3220, Sept. 15, 1985, "Diffraction Characteristic of Photoresist Surface--Relief Gratings" by M. G. Moharam, T. K. Gaylord, G. T. Sincerbox, H. Werlich and B. Yung.
Ljung Bo H. G.
Stiles John C.
Jr. Leon Scott
Kearfott Guidance and Navigation Corporation
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