초록 ▼

A device for optically measuring the distance of a target (20) comprising a monomode coherent light source (18) means (18a, 21, 30) for periodically varying the wavelength of the light of the source, a photodetector (19) for detecting the variation in the wavelength between the light from the source

A device for optically measuring the distance of a target (20) comprising a monomode coherent light source (18) means (18a, 21, 30) for periodically varying the wavelength of the light of the source, a photodetector (19) for detecting the variation in the wavelength between the light from the source (18) and that retroradiated by the target (20), and means (23, 24, 25; 33, 34, 35; 41, 43, 46) for processing the output signal of the photodetector (19) corresponding to the composite optical signal issuing from the cavity of the source of light and resulting from the re-injection into this cavity of the light retroradiated by the target (20), the frequency of the output signal of the photodetector being representative of the distance between the source (18) and the target (20).

대표청구항 ▼

Process for optically measuring the distance between a target and a given location, comprising sending toward the target a radiation having a periodically varying wavelength from a monomode coherent light source placed at said location by supplying said source with a signal of variable power, receiv

Process for optically measuring the distance between a target and a given location, comprising sending toward the target a radiation having a periodically varying wavelength from a monomode coherent light source placed at said location by supplying said source with a signal of variable power, receiving the radiation retroradiated by said target, re-injecting said retroradiated radiation into the cavity of said light source, and receiving on a photodetector placed at the rear of said cavity the beat between said retroradiated radiation and the radiation from said source, the frequency of the beat which is proportional to the delay of the retroradiated wave being representative of the distance between said source and said target, wherein the monomode coherent light source is a laser diode whose property of wavelength variation is a function of the supply power, said signal of variable power being supplied to said diode directly.