CN212675175U - Laser coherent speed measurement system - Google Patents

Laser coherent speed measurement system Download PDF

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Publication number
CN212675175U
CN212675175U CN202021096328.5U CN202021096328U CN212675175U CN 212675175 U CN212675175 U CN 212675175U CN 202021096328 U CN202021096328 U CN 202021096328U CN 212675175 U CN212675175 U CN 212675175U
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laser
coherent
receiver
transmitter
target
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CN202021096328.5U
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Chinese (zh)
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郑重
杨新艳
吕海平
苏云
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Shenzhen Qingrui Technology Co Ltd
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Shenzhen Qingrui Technology Co Ltd
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Abstract

The utility model relates to a laser coherent velocity measurement system, including the laser receiver who is used for the laser emitter of transmission laser beam and is used for receiving the laser echo signal of surveyed the target that sets up side by side, laser emitter with one side of laser receiver is provided with the laser optical system that is used for making the laser beam collimation directive of transmission and makes the laser echo signal of surveyed the target focus back along opposite direction, laser optical system with laser emitter with be provided with the T/R switch that is used for acquireing the laser beam from transmission to the time of receipt between the laser receiver. The utility model discloses a coherent system of testing speed of laser sets up side by side through laser emitter and laser receiver and combines laser optical system to make the laser beam of transmission and the laser beam that is returned by the survey target to constitute coherent light beam, can produce stable interference, has improved stability, adopts the T/R switch of the sliding distance door control technique based on time simultaneously, has improved the accuracy of measuring target speed.

Description

Laser coherent speed measurement system
Technical Field
The utility model relates to a laser technical field, more specifically say, relate to a laser coherent speed measuring system.
Background
In the process of sensing the external environment, the measurement of the moving speed information of the target at a certain distance is one of the key technologies. Radio measurement systems are generally adopted, and the equipment has the advantages of mature technology and low cost. However, the measurement, measurement accuracy and stability of the false target are greatly affected by surrounding active and passive interference devices and radio signals for communication.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a laser coherent speed measurement system, the radio measurement system who has solved among the prior art easily receives the interference and leads to testing the speed unstable, the poor problem of precision to the target.
The utility model provides a technical scheme that technical problem adopted is: a laser coherent speed measurement system comprises a laser transmitter and a laser receiver, wherein the laser transmitter is used for transmitting a laser beam, the laser receiver is used for receiving a laser echo signal of a measured target, the laser transmitter and the laser receiver are arranged in parallel, a laser optical system used for enabling the transmitted laser beam to be collimated to emit to the measured target and enabling the laser echo signal of the measured target to be focused and returned in the opposite direction is arranged on one side of the laser transmitter and the laser receiver, and a T/R switch used for acquiring the time from transmitting to receiving of the laser beam is arranged between the laser optical system and the laser transmitter and the laser receiver.
The utility model discloses an among the laser coherent velocity measurement system, laser emitter includes optic fibre laser seed source, optic fibre acousto-optic modulator and optic fibre laser amplifier.
In the laser coherent velocity measurement system of the present invention, the wavelength of the laser beam emitted from the laser emitter is 1.55 μm.
The utility model discloses an among the laser coherent speed measurement system, laser receiver includes silicon avalanche photodiode's APD photoelectric detector.
The utility model discloses an among the coherent speed measuring system of laser, laser optical system is the tight shot.
The utility model discloses an among the laser coherent velocity measurement system, the focus of tight shot is 300 and gives once more 500 mm.
The utility model discloses an among the laser coherent speed measurement system, the laser coherent speed measurement system still includes signal processor, signal processor respectively with laser emitter, laser receiver and T/R switch link to each other.
The utility model discloses an among the laser coherent velocity measurement system, signal processor includes AD sampling chip and is used for calculating the moving speed's of surveyed object calculation according to the laser beam from the time of launching to receiving and the Doppler shift of laser beam calculation chip.
The utility model discloses an among the laser coherent speed measuring system, the laser coherent speed measuring system is still including the terminal that is used for demonstration and control, the terminal respectively with laser emitter, laser receiver, T/R switch and information processor link to each other.
Implement the utility model discloses a coherent speed measuring system of laser has following beneficial effect: the utility model discloses a coherent system of testing speed of laser sets up side by side through laser emitter and laser receiver and combines laser optical system to make the laser beam of transmission and the laser beam that is returned by the survey target to constitute coherent light beam, can produce stable interference, has improved stability, adopts the T/R switch of the sliding distance door control technique based on time simultaneously, has improved the accuracy of measuring target speed.
Drawings
Fig. 1 is the general structure block diagram of the laser coherent velocity measurement system of the present invention.
Detailed Description
The structure and action principle of the laser coherent velocity measurement system of the present invention will be further explained with reference to the accompanying drawings and embodiments:
in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the preferred embodiment of the present invention provides a laser coherent velocity measurement system, which includes a laser transmitter 1 for transmitting a laser beam and a laser receiver 2 for receiving a laser echo signal of a measured object, wherein the laser transmitter 1 and the laser receiver 2 are substantially parallel and arranged side by side, so that the transmitted laser beam and the laser echo signal are substantially parallel, and the laser echo signal is a laser beam returned by the transmitted laser beam via the measured object. By this design, the laser beam emitted by the laser and the laser beam returned by the detection object constitute a coherent beam, and stable interference can be generated.
The laser transmitter 1 comprises an optical fiber laser seed source, an optical fiber acousto-optic modulator and an optical fiber laser amplifier. That is, the laser transmitter 1 is an all-fiber laser transmitter 1, so that the overall structure of the system is more lightweight and compact, and the stability is higher. The laser light source with high stability, narrow linewidth single-frequency characteristic and high laser modulation isolation is obtained through a full-fiber narrow linewidth frequency-stabilized laser seed source technology, a high-stability acousto-optic modulation technology, a high-beam-quality large-energy pulse amplification technology and a miniaturization integration mode, and the requirement of high-energy high-stability single-frequency laser during laser detection is met.
The laser emitter 1 emits a laser beam having a wavelength of 1.55 μm. That is, the wavelength of the fiber laser seed source was chosen to be 1.55 μm. The advantages of this band include: firstly, the working wavelength is safe for human eyes, the maximum allowable exposure of the laser with the wave band of 1.55 mu m is 10 times of that of the laser with the wave band of 2.1 mu m, and the maximum allowable exposure is 5 orders of magnitude higher than that of the laser with the wave band of 1.06 mu m; secondly, the Doppler frequency shift caused by the moving target is higher in speed resolution, and under the same moving speed, the shorter the wavelength is, the larger the Doppler frequency shift caused by the moving target is, the more the identification of the target speed is facilitated; thirdly, the working distance of the laser coherent speed measurement system is limited by two factors: on one hand, the wavelength is required to be in an atmospheric window to reduce transmission loss, and on the other hand, a target is required to have certain reflection characteristics to obtain higher echo light power, and a 1.55 mu m wave band is just positioned between the atmospheric window and an atmospheric absorption spectral line and has stronger atmospheric transmittance characteristics and reflection characteristics; fourthly, the 1.55 mu m wave band is a main communication wave band, the technical development level of the device is mature, the system is wider in the selectivity aspect of the device, and different application requirements can be met; fifthly, the laser light source is suitable for light weight design and development, the laser light source with the wave band of 1.55 mu m has smaller volume and higher integration level, and the technology is mature and reliable. The laser transmitter 1 is, for example, an ELBA-planar type high power near infrared fiber output laser manufactured by Quantel of france.
The laser receiver 2 comprises an APD photodetector of a silicon avalanche photodiode. For example, a PIN-07FSL type near infrared enhancement avalanche photodiode of OSI Optoelectronics corporation is adopted, which has more excellent responsivity in the near infrared spectrum, and can provide a solar blind type, i.e., having a low correspondence to the visible light band, having high responsivity to the near infrared band, and thus having higher detection sensitivity. The laser receiver 2 is mainly used for receiving laser echoes of a detected target and obtaining Doppler frequency shift information of the target after frequency mixing. The laser receiver 2 can improve the detection sensitivity of laser echo signals under the condition of weak laser scattering intensity under the condition of poor atmospheric environment conditions, and high-sensitivity speed information detection of weak signals is realized by selecting the optimal local oscillator optical signal power and the optimal detection system.
Referring to fig. 1, one side of the laser transmitter 1 and the laser receiver 2 is provided with a laser optical system 3 for collimating the transmitted laser beam toward the target to be measured and focusing a laser echo signal of the target to be measured back in the opposite direction, and a T/R switch 4 for acquiring the time from transmission to reception of the laser beam is provided between the laser optical system 3 and the laser transmitter 1 and the laser receiver 2.
The laser optical system 3 is a fixed focus lens, the focal length of the fixed focus lens is 300-500mm, the focal length can be 300mm, 400mm, 500mm, preferably 400 mm. For example, a Nikon AF-S Nikel prime lens is adopted, the focal length is 400mm, and optical anti-shake is supported.
The T/R switch 4 is switched using, for example, a DG535 digital delay generator manufactured by princeton instruments. The T/R switch 4 is utilized to record the time from the emission to the reception of the laser through a sliding range gate control technology, so that the accurate position of the target can be obtained, and the accuracy of the target speed detection is improved.
The laser coherent speed measurement system further comprises a signal processor 5 and a terminal 6 used for displaying and controlling, wherein the signal processor 5 is respectively connected with the laser transmitter 1, the laser receiver 2 and the T/R switch 4, and the terminal 6 is respectively connected with the laser transmitter 1, the laser receiver 2, the T/R switch 4 and the information processor. Here, "connected" may be based on RS422, bus or ethernet communication interface, etc. to realize connection and information interaction.
The terminal 6 may be a computer, laptop, cell phone, IPAD, etc. The terminal 6 can display the operation parameters of each subassembly, display the information of the current detection target such as real-time distance, speed and the like, provide necessary control signals for each subassembly, and store and output data.
The signal processor 5 includes an AD sampling chip and a calculation chip. The computing chip is used for computing the moving speed of the measured object by using the time from the emission to the reception of the laser beam and the Doppler frequency shift of the laser beam according to the signals of the T/R switch 4 and the laser receiver 2. The AD sampling chip adopts a 24-bit AD sampling chip with the model of MCP3901, for example. The computing chip is an FPGA chip, such as a Spartan-7 series FPGA chip manufactured by Xilinx corporation. The signal processor 5 is used for completing the functions of sampling of detection signals, calculating the distance of the target, calculating the radial velocity of the target, calculating the velocity vector of the target and the like.
The effective detection distance of the laser coherent speed measurement system is more than or equal to 3km, the effective speed measurement range is 0-100 m/s, and the speed measurement precision is less than or equal to 0.05 m/s.
It should be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings, but fall within the scope of the appended claims.

Claims (9)

1. A laser coherent speed measurement system is characterized by comprising a laser transmitter and a laser receiver, wherein the laser transmitter is used for transmitting a laser beam, the laser receiver is used for receiving a laser echo signal of a measured target, the laser transmitter and the laser receiver are arranged in parallel, a laser optical system used for enabling the transmitted laser beam to be collimated and emitted to the measured target and enabling the laser echo signal of the measured target to be focused and returned in the opposite direction is arranged on one side of the laser transmitter and the laser receiver, and a T/R switch used for acquiring the time from the transmission to the reception of the laser beam is arranged between the laser optical system and the laser transmitter and the laser receiver.
2. The laser coherent velocity measurement system according to claim 1, wherein the laser transmitter includes a fiber laser seed source, a fiber acousto-optic modulator and a fiber laser amplifier.
3. The laser coherent velocity measurement system according to claim 1, wherein the laser transmitter emits a laser beam having a wavelength of 1.55 μm.
4. The laser coherent velocimetry system of claim 1, in which the laser receiver comprises an APD photodetector of a silicon avalanche photodiode.
5. The laser coherent velocity measurement system according to claim 1, wherein the laser optical system is a fixed focus lens.
6. The laser coherent velocity measurement system according to claim 5, wherein the focal length of the fixed focus lens is 300-500 mm.
7. The laser coherent velocity measurement system according to claim 1, further comprising a signal processor, wherein the signal processor is connected to the laser transmitter, the laser receiver and the T/R switch respectively.
8. The laser coherent velocity measurement system according to claim 7, wherein the signal processor comprises an AD sampling chip and a calculation chip for calculating the moving speed of the measured object according to the time from emission to reception of the laser beam and the Doppler shift of the laser beam.
9. The laser coherent speed measurement system according to claim 1, further comprising a terminal for display and control, wherein the terminal is connected to the laser transmitter, the laser receiver, the T/R switch and the information processor, respectively.
CN202021096328.5U 2020-06-15 2020-06-15 Laser coherent speed measurement system Active CN212675175U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021096328.5U CN212675175U (en) 2020-06-15 2020-06-15 Laser coherent speed measurement system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021096328.5U CN212675175U (en) 2020-06-15 2020-06-15 Laser coherent speed measurement system

Publications (1)

Publication Number Publication Date
CN212675175U true CN212675175U (en) 2021-03-09

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CN (1) CN212675175U (en)

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