Laser phase range finding method

Abstract

A laser phase range finding method disclosed by the present invention comprises the steps of dividing the laser emitted out by a spectroscope into the inner light path laser and the outer light path laser; using an inner/outer light path APD mixer circuit to carry out the mixing processing on the inner light path laser and the outer light path laser separately, using a second-order band-pass filtering amplifying circuit to carry out the signal amplifying and filtering processing on the inner light path laser and the outer light path laser after the mixing processing in a time sharing manner, using an AGC circuit to carry out the amplitude amplification processing on the inner light path laser and the outer light path laser after the amplification and filtering processing separately, using an MCU to obtain the phase difference of the inner light path laser and the outer light path laser after the amplitude amplification processing, and obtaining the measurement distance corresponding to the outer light path laser after the range finding according to the phase difference of the inner and outer light paths. The beneficial effects of the present invention are that a total phase error caused under different environments is eliminated real-timely, so that the range finding stability and precision are improved; the AGC circuit and the second-order band-pass filtering amplifying circuit are utilized simultaneously to improve the amplitude and the signal to noise ratio of a signal, so that the phase difference operation is more accurate.

Description

technical field [0001] The invention relates to the field of laser ranging, in particular to a laser phase ranging method. Background technique [0002] Laser phase rangefinders currently on the market are roughly divided into three types according to the measurement optical path: single emission and single reception, single emission and single reception (using motor switching to achieve dual optical paths), double emission and single reception, and double emission and double reception. But each has its own advantages and disadvantages. [0003] Such as figure 2 , taking single emission and single reception as an example, the measurement method of single emission and single reception introduces a phase error in the actual measurement However, when the single optical path eliminates the above-mentioned phase error, a large number of experiments are required to simulate the data of the phase error caused by various environments, and the algorithm is used to correct the meas...

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Problems solved by technology

[0003] like figure 2 , taking single emission and single reception as an example, the measurement method of single emission and single reception introduces a phase error in the actual measurement However, when the single optical path eliminates the above-mentioned phase error, a large number of experiments are required to simulate the data of the phase error caused by various environments, and the algorithm is used to correct the measured

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