초록 ▼

The present invention relates to a range-finder comprising a laser pulse emission device and a device for detecting the pulses reflected by a distant object. The emission device is capable of emitting pulses of N distinct wavelengths, N being an integer greater than 1, with, for each wavelength, a p

The present invention relates to a range-finder comprising a laser pulse emission device and a device for detecting the pulses reflected by a distant object. The emission device is capable of emitting pulses of N distinct wavelengths, N being an integer greater than 1, with, for each wavelength, a pulse repetition frequency less than a predetermined threshold frequency. Thus, no given wavelength emission will be faced with the problem of distance ambiguity.

대표청구항 ▼

1. A range-finder comprising a laser pulse emission device, a device for detecting the pulses reflected by a distant object, and a means to post-integrate the detected pulses and provide a signal to noise ratio proportional to the square root of the number of emitted pulses, wherein the emission dev

1. A range-finder comprising a laser pulse emission device, a device for detecting the pulses reflected by a distant object, and a means to post-integrate the detected pulses and provide a signal to noise ratio proportional to the square root of the number of emitted pulses, wherein the emission device is capable of emitting pulses of N distinct wavelengths, N being an integer greater than 1, with, for each wavelength, a pulse repetition frequency less than a predetermined threshold frequency to avoid distance ambiguity and wherein from one wavelength to another, the pulse repetition frequencies are different. 2. The range-finder as claimed in claim 1, wherein the pulses are emitted at emission instants, and wherein the emission instants of the pulses of different wavelengths are different. 3. The range-finder as claimed in claim 1, wherein the detection device detects the reflected pulses for each of the N wavelengths, and further comprises a device for accumulating the detected pulses. 4. The range-finder as claimed in claim 1, wherein the emission device comprises K emitters, each being capable of emitting pulses at Mi distinct wavelengths, i varying from 1 to K, with M1+M2+ . . . +Mk=N, K being an integer such that 11, the emission device comprises a multiplexing device for multiplexing the pulses obtained from the K emitters.