Displacement information detecting apparatus

Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer

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356354, 356 285, G01B 1102

Patent

active

053272226

ABSTRACT:
A displacement information measuring apparatus comprising light emitting source for emitting two light fluxes, acoustic optical device for giving a predetermined frequency difference to the two light fluxes from the light emitting source, optical system having a diffraction grating upon which at least one light flux of two light fluxes having the predetermined frequency difference given by the acoustic optical device is vertically incident so that the light fluxes are diffracted, the optical system causing at least one light flux from the diffraction grating to be incident upon an object in which the displacement information is to be measured, and detector for performing a detection by interference of one light flux incident upon said object and emergent from said object with the other of the two light fluxes, the displacement information of the object being obtained from a beat signal corresponding to the frequency difference and obtained from the detector, wherein the optical system is constituted such that the frequency of the beat signal may not be substantially affected by a variation of wavelength of the light flux incident upon the diffraction grating.

REFERENCES:
patent: 4633714 (1987-01-01), Mazumder et al.
patent: 4948257 (1990-08-01), Kaufman et al.
Laser Und Optoelektronik, vol. 17, No. 4, Dec. 1985, Stuttgart De pp. 362-375; B. Ruck et al; "Laser Doppler-Anemometrie".
Measurement Science & Technology vol. 1, No. 3, Mar.1990, Bristol GB pp. 265-271 X. Guo et al.: "A new LDA system utilising the optic-hybrid feedback technique".

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