Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1989-07-18
1991-08-06
Turner, Samuel
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356356, 25023114, G01B 902
Patent
active
050372068
ABSTRACT:
An optical position transmitter comprises a movable code element (36). A light beam (44) is directed onto the code element. The coding of the code element (36) generates in the reflected light beam (44) sub-light beams having different optical path differences. This may be effected by stepped surface portions on the surface of the code element (36). The optical path differences are greater than the coherency length of the light of the light source (62). The reflected light beam is directed through a beam splitter (42) onto an interferometer for detection of the optical path differences. Interferences between sub-light beams are permitted by well-defined quick changes in the interferometer with determined path differences. Position signals can be obtained from the thus obtained "interference peaks".
REFERENCES:
patent: 4291976 (1981-09-01), McMahon
patent: 4309109 (1982-01-01), Blodgett et al.
patent: 4596466 (1986-06-01), Ulrich
patent: 4636076 (1987-01-01), Pettigrew
patent: 4829342 (1989-05-01), Nishimura
Paper by D. Hickmann in "Journal of Physics E/Scientific Instruments" Publication by Glomb in Proceedings IEEE/AIAA, 1988; pp. 187-192.
Etzkorn Horst
Hauck Roland
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