Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1988-06-30
1990-05-01
Tarcza, Thomas H.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356373, 356381, 356384, 33707, 33813, 33818, G01C 308, G01B 1114
Patent
active
049223070
ABSTRACT:
This invention provides apparatus and method to increase the direct measurement accuracy of a rotary encoder type of micrometer 10. To overcome a maximum measurement accuracy of 100 microinches there is provided a laser displacement meter which includes a laser head 24 which is coupled to a micrometer bed 12 by a pair of of clamps 26a and 26b and by a magnetic plate 28. Laser head 24 has an output display 30 associated therewith for indicating the magnitude of the measurement made by the laser head 24. Laser head 24 is operable for providing an output chirped laser beam 32 and for receiving a reflected output beam 34. A corner cube reflector 36 is mounted by an arm 38 to a headstock spindle 18. The reflected return beam is detected and processed by a phase demodulator and converted into pulses. The pulses are counted and converted to distance and displayed. Operating in accordance with the Doppler effect, movement of the reflector induces a frequency shift in the chirped laser beam, the frequency shift being a function of velocity of the moving reflector and, hence, the velocity and distance traveled by the spindle 18. This frequency shift is detected by the phase demodulator and is converted to a displacement.
REFERENCES:
patent: 3172940 (1965-03-01), Rantsch
patent: 3813165 (1974-05-01), Hines et al.
patent: 4320577 (1982-03-01), Lauritzen
patent: 4377036 (1983-03-01), Dangschat
patent: 4666295 (1987-05-01), Duvall, III et al.
patent: 4715706 (1987-12-01), Wang
patent: 4732472 (1988-03-01), Konig et al.
patent: 4786176 (1988-11-01), Froome
"Digital English/Metric Electrolimit Supermicrometer, Model C, U 302566, Instruction Book", Mar. 1979, Revised Apr. 1981, Pratt & Whitney Measuring Systems Operation.
"Laser Doppler Displacement Meter", Optodyne, Inc., undated.
Denson-Low Wanda K.
Hughes Aircraft Company
Streeter William J.
Tarcza Thomas H.
Wallace Linda J.
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