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Laser measurement method and device based on double sideband modulation

A double-sided band and modulated light technology, which is applied in measuring devices, radio wave measuring systems, electromagnetic wave re-radiation, etc., can solve problems such as inability to achieve real-time measurement

Active Publication Date: 2019-06-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this solution is that two different difference frequency signals come from different time periods, which not only need to be calculated after the signal is collected, but also cannot realize real-time measurement in the true sense.

Method used

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  • Laser measurement method and device based on double sideband modulation
  • Laser measurement method and device based on double sideband modulation
  • Laser measurement method and device based on double sideband modulation

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Experimental program
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Embodiment 1

[0053] The basic structure of the laser measuring device in this embodiment is as follows: figure 2 As shown, including: microwave source, light source, power splitter, optical beam splitter, optical beam combiner, double sideband modulator, photodetector, electrical mixer, frequency measurement and data processing module, laser transmitting module and laser receiving module. The linear frequency modulation microwave signal sent by the microwave source is divided into two paths by the power divider, and input into the microwave input port of the double sideband modulator and the input port of the electric mixer respectively. The output of the light source is divided into two paths by the optical beam splitter, one path is used as the optical carrier input to the double-sideband modulator; the other path is used as the local oscillator light, which is combined with the laser echo received by the laser receiving module through the optical beam combiner, and then input to the ph...

Embodiment 2

[0068] The basic structure of the laser measuring device in this embodiment is as follows: image 3 As shown, it includes: microwave source, light source, optical beam splitter, optical beam combiner, double sideband modulator, photodetector, electrical mixer, frequency measurement and data processing module, laser transmitting module and laser receiving module. The linear frequency modulation microwave signal sent by the microwave source is input into the microwave input port of the double sideband modulator, and the light source outputs the optical carrier to the double sideband modulator. The carrier-suppressed double-sideband modulated optical signal output by the double-sideband modulator is divided into two paths by the optical beam splitter, one path is used as the probe light and transmitted to the object to be measured through the laser emitting module; the other path is used as the local oscillator signal through the optical beam combiner and the laser The laser echo...

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Abstract

The invention discloses a laser measurement method based on double-sideband modulation, which is used for measuring distance information and speed information of an object to be measured simultaneously. The laser measurement method comprises the steps of modulating a linear frequency modulation microwave signal on an optical carrier, and generating a carrier-suppressed double-sideband modulation optical signal; then using the generated double-sideband modulation optical signal as probe light, and transmitting the probe light to the object to be measured; performing frequency beating on an echo signal and a local oscillation optical signal to obtain an electric signal which simultaneously contains time delay information and Doppler frequency shift information of the echo signal, wherein the local oscillation optical signal is obtained by splitting the optical carrier or the double-sideband modulation optical signal; and finally extracting the time delay information and the Doppler frequency shift information of the echo signal from the electric signal, obtaining distance information of the object to be measured according to the time delay information, and obtaining speed information of the object to be measured according to the Doppler frequency shift information. The invention further discloses a laser measurement device based on double-sideband modulation. The laser measurement method and device based on double-sideband modulation can simultaneously realize real-time and accurate measurement for the distance information and the speed information of the object to be measured.

Description

technical field [0001] The invention relates to a laser measurement method based on double sideband modulation, which is used for simultaneously measuring distance and speed information of an object to be measured. Background technique [0002] Laser distance measurement and laser speed measurement are important applications of laser technology. Laser has the advantages of high coherence, directivity, and monochromaticity, which can realize long-distance and high-precision ranging functions. At the same time, the reflected light of moving objects will introduce Doppler frequency shift, and laser speed measurement can be realized by measuring Doppler frequency shift. [0003] At present, there are two main systems of laser ranging and speed measuring systems. The first one uses laser pulses as the probe light, and obtains the position information of the object to be measured by measuring the time-of-flight of the laser pulses. The distance measurement accuracy of this meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/58
CPCG01S17/58
Inventor 徐忠扬潘时龙唐良尊张洪祥
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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