Frequency division multiplexing type paralleling laser length measuring instrument

A technology of laser length measuring instrument and frequency division multiplexing, which is applied in the direction of using optical devices, optics, instruments, etc., can solve the problems of slow measurement speed, inability to meet three-dimensional measurement, and low accuracy of phase identification, and achieve the goal of improving speed and efficiency Effect

Inactive Publication Date: 2008-04-09
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

[0003] The disadvantages of the above-mentioned phase laser length measuring instruments are: single-beam emission and single-beam reception are adopted, the measurement speed is slow, and the accuracy of phase detection is low; If the time-division multiplex

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  • Frequency division multiplexing type paralleling laser length measuring instrument
  • Frequency division multiplexing type paralleling laser length measuring instrument
  • Frequency division multiplexing type paralleling laser length measuring instrument

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[0014] The present invention will be described in further detail below in conjunction with the drawings:

[0015] As shown in Figure 1, the frequency division multiplexing type parallel laser length measuring instrument of the present invention is mainly composed of a digital signal processor 1, a DDS main oscillator module 2, a DDS local oscillator module 3, a laser modulation and emission module 4, and a photoelectric receiver 6. , The first mixing module 7, the second mixing module 8 and the A / D conversion circuit 9. The working principle of the length measuring instrument is: the digital signal processor (DSP) 1 controls the m-channel DDS main vibration module 2 to generate m-channel main vibration signals, and controls the DDS local oscillator module 3 to generate a local oscillator signal and m-channel main vibration signals. The synthesized signal and one output as the local oscillator signal are connected to the first mixing module 7 for mixing to generate a reference sign...

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Abstract

A frequency-division multiplex-typed concurrent laser length-measuring instrument relates to the technical field of a laser length-measuring method, a three-dimensional measuring method and a laser three-dimensional imaging method. The length-measuring instrument uses a novel method of multi-channel frequency-division multiplexing modulation and synchronous phase detection concurrent length-measuring, uses DDS technique to realize the multi-channel laser frequency-division multiplexing sine modulation, uses a FFT calculating method to conduct the phase detection of the multi-channel synthetic signals, and then gains the distances of each point. The invention has the advantages that: the length-measuring instrument makes full use of the frequency-division concurrent multi-channeled modulation, adopts a single-channeled photoelectric receiver to receive the multi-channel diffusely reflected laser modulation signals, and uses DSP high-speed digital Fourier transforming technology to realize the synthetic digital phase-detecting function of multi-channel signals, thus the concurrent phase-detection length-measuring by multi-channel laser is realized, and the speed and efficiency of the length-measuring is greatly improved.

Description

technical field [0001] The invention relates to the technical field of a laser length measurement method, a three-dimensional measurement method and a laser three-dimensional imaging method, in particular to a frequency division multiplexing type parallel laser length measuring instrument. Background technique [0002] The existing phase laser length measuring instrument mainly uses the control and processing unit to control the Direct Digital Synthesizer (DirectDigital Synthesizer; DDS) to generate a laser modulation signal. The light reaches the same photoelectric receiver and is mixed with the local oscillator signal generated by DDS to obtain a ranging signal with a sine wave phase delay. After passing through the phase detector circuit, the phase difference of the laser at the measured point is obtained, so as to measure the round-trip of the laser. Time, and further calculate the distance between the measured point and the rangefinder. [0003] The disadvantages of th...

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Application Information

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IPC IPC(8): G01B11/02G01S17/08G01S7/481G02F1/35
Inventor 熊木地周爱霞何颖秋赵荣芳郭静寰
Owner DALIAN MARITIME UNIVERSITY
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