Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1992-08-12
1994-11-01
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356357, G01B 902
Patent
active
053611314
ABSTRACT:
An optical displacement measuring apparatus of the present invention optically measures a displacement amount of an object. The apparatus includes: image forming means for forming an image indicative of the displacement amount of the object achieved between first and second timings; first modulating means for modulating coherent light in accordance with the image; first Fourier transform means for subjecting the coherent light modulated by said first modulating means to Fourier transformation to thereby form a first Fourier image; second modulating means for modulating coherent light in accordance with the first Fourier image; second Fourier transform means for subjecting the coherent light modulated by said second modulating means to Fourier transformation to thereby form a second Fourier image; detecting means for detecting peak position of the second Fourier image indicative of the displacement amount of the object between the first and second timings; and time interval adjusting means for adjusting a time interval defined between the first and second timings.
REFERENCES:
Optics Letters vol. 15, No. 5, Mar. 1, 1990, pp. 285-287, "Bistable Spatial Light Modulator Using a Ferroelectric Liquid Crystal" Fukushima et al.
Optics Communications, vol. 78, No. 5/6, Sep. 15, 1990, pp. 322-326, "Real-Time Optical Joint Transform Correlator For Velocity Measurement Using Clipped Speckle Intensity", Ogiwara et al.
"Application of LCTV to nonlinear speckle correlator", Akifumi Ogiwara, Optics Communications, vol. 86, No. 6, Dec. 15, 1991, pp. 513-522.
"Measurement of Surface Displacement by Speckle Image Technique--Quasi Real-Time Measurement Utilizing a Liquid Crystal Display" (Electronics Information and Communication Society Papers C-I vol J73-C-I No. 3, pp. 128-133, Mar., 1990 (Abstract).
"Joint Transformation type Speckle Pattern Correlation Detector with using non-linear detector" Optics vo. 20-5, May 1991 (Abstract).
"Real-time optical correlator for doubly exposed clipped speckle", Ogiwara, et al., Optics Communications, vol. 78, No. 3, 4, Sep. 1, 1990, pp. 213-216.
Kobayashi Yuji
Tekemori Tamiki
Hamamatsu Photonics K.K.
Kim Robert
Turner Samuel A.
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