Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1990-04-12
1991-11-12
Turner, Samuel
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
250237G, 25023116, G01B 902
Patent
active
050642901
ABSTRACT:
Apparatus for generating a quadrature signal for the purpose of determining the direction in which the scale is being read. There is provided a primary grating means defining spaced lines and adapted for generating orders of diffraction, secondary grating means defining spaced lines arranged at an angle to those of the primary grating means thereby to separate said orders of diffraction into differing phases, and tertiary grating means movable together with the secondary grating means relative to said primary grating means and adapted for detecting the respective said phases and for generating correspondingly phased light modulations which are detected by respective transducers connected to a quadrature-forming circuit.
REFERENCES:
patent: 4091281 (1978-05-01), Willhelm et al.
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patent: 4273448 (1981-06-01), Schiler
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patent: 4776701 (1988-10-01), Pettigrew
patent: 4800547 (1989-01-01), Kessels et al.
"Interference-Generated Moire Fringes in a System of Three Reflection Gratings" Kulindzhi et al., Optical Technology, vol. 38, No. 10, Oct. 1971.
McMurtry David R.
Stephens William F. N.
Renishaw plc
Turner Samuel
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