Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1995-05-19
1996-11-12
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
250237G, G01B 902
Patent
active
055745580
ABSTRACT:
An optical encoding apparatus is provided which is not affected by fluctuation of wavelength of a light beam due to temperature change, without sacrificing resolution of measurement. The optical encoding apparatus includes a light source for emitting a light beam, a light beam condenser for condensing the light beam emitted by the light source, a first diffraction grating to which light beams condensed by the light beam condenser are directed, and a second diffraction grating to which light beams exiting from the first diffraction grating are directed. Additionally, a displacement information obtaining device is included for obtaining information regarding a displacement of one of the first and second diffraction gratings, the information being obtained according to a twice-diffracted beam and a twice-transmitted beam incident upon the second diffraction grating. The twice-diffracted beam is diffracted by the first diffraction grating, and the twice-transmitted beam is transmitted through the first diffraction grating.
REFERENCES:
patent: 5486923 (1996-01-01), Mitchell et al.
Baba Nobuyuki
Kudo Kouichi
Maeda Hideo
Ricoh & Company, Ltd.
Turner Samuel A.
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