Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1988-07-28
1990-11-27
Willis, Davis L.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356349, 356351, 356358, G01B 902
Patent
active
049731530
ABSTRACT:
A range finder for finding a distance to an object comprising an outgoing light guiding wave path, a reference light guiding wave path, and an incoming light guiding wave path. The finder further comprises wavelength changing means for changing the wavelength of the beam of light emitted from the light source, wavelength detecting means for detecting the wavelength of the beam of light emitted from the light source, and calculating means for detecting at least two peaks of the signal coming from the light receiving element when the wavelength of the light source is changed by the wavelength changing means, finding the wavelengths of the light source, respectively, from the wavelength detecting means at the time when the signal exhibits the two peaks, and calculating the distance to the object according to an operation expression memorized beforehand with reference to such obtained two wavelengths. A total reflection prism, a polarized beam splitter, a quarter-wave plate, and a mode converting device are also provided.
REFERENCES:
patent: 3970389 (1976-07-01), Mendrin et al.
Hori Nobuo
Niimura Satoru
Shimozono Hiroaki
Yokokura Takashi
Kabushiki Kaisha Topcon
Koren Matthew W.
Willis Davis L.
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