CN216351222U

CN216351222U - Multi-beam single-photon detection laser radar

Info

Publication number: CN216351222U
Application number: CN202122013346.3U
Authority: CN
Inventors: 夏海云; 裘家伟
Original assignee: Zhongke Yian Shenzhen Technology Co ltd
Current assignee: Zhongke Yian Shenzhen Technology Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-04-19
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses a multi-beam single photon detection laser radar which comprises a seed light laser, a fiber isolator, an acousto-optic modulator, a first pulse fiber amplifier, a multi-channel fiber beam splitter, a pulse fiber amplifier, a circulator, a multi-beam transceiving telescope, a single photon detector and a multi-channel digital acquisition card, wherein a light source point of the seed light laser is connected with the input end of the fiber isolator through an optical fiber, and the output end of the fiber isolator is connected with the signal input end of the acousto-optic modulator through an optical fiber; the utility model adopts large-view-field multi-line laser output, and can simultaneously detect the target distance, elevation angle, azimuth and wind field of N view fields; the laser multi-line output with a large field angle is adopted, so that the detection field angle range is enlarged while the detection distance is ensured; the horizontal scanning device is matched, so that high-speed three-dimensional space atmosphere and target detection can be realized; the method of driving N laser amplifiers by using a single seed optical laser saves the cost of a plurality of seed optical lasers.

Description

Multi-beam single-photon detection laser radar

Technical Field

The utility model relates to the technical field of laser radars, in particular to a multi-beam single photon detection laser radar.

Background

The basic principle of the laser radar is as follows: the emergent laser pulse interacts with the atmosphere, an optical antenna is adopted to collect atmosphere backscattering signals and then input the signals into an optical receiver, and a series of key atmospheric parameters are obtained after photoelectric conversion, analog-to-digital conversion and data processing. Such as aerosol concentration, PM2.5 value, cloud height, temperature, humidity, visibility, atmospheric components (e.g., moisture, various pollutant gas components), etc.

From the detection mode, the 1.5 μm laser radar is divided into a direct detection laser radar and a coherent detection laser radar. The direct detection wind measurement laser radar detects the atmospheric echo intensity by using a direct detector such as a single photon detector to obtain atmospheric parameter information. The direct wind lidar adds a frequency discriminator in front of a detector to convert the change of laser frequency into relative change of energy, thereby extracting wind speed information. The coherent detection laser radar carries out beat frequency through the atmosphere echo signal and the local oscillator signal, and extracts the Doppler power spectrum information of the atmosphere after carrying out Fourier transform on the radio frequency signal after the beat frequency signal. The central frequency shift of the power spectrum can reflect wind speed information, and the spectral area is the strength of the atmospheric echo signal. Compared with the direct detection radar and the coherent detection wind measurement laser radar, the direct detection radar has the advantages of high sensitivity and high distance resolution, and other echo signal information can be obtained by detection of the coherent detection wind measurement laser radar besides the detection capability of a wind field, so that the atmospheric parameters such as rain, snow, cloud and wind shear are detected.

In the direct detection of the direction of the laser radar, the laser radar team of the university of science and technology in China developed a single photon detection laser radar. The radar does not rely on a high-power laser and a large-area telescope any more, and a scheme with high quantum efficiency and full optical fiber integration is provided. At present, the single photon detection laser radar can realize meteorological parameter (wind, temperature, humidity and density) detection and can also realize environmental protection parameter (PM2.5\ PM10, visibility, atmospheric pollution component and polarization state of dyed particles). In the direction of coherent detection, the university of science and technology in China develops a high-performance atmospheric detection coherent laser radar with high spatial-temporal resolution and long detection distance. By upgrading the traditional coherent system and improving the data processing algorithm, the detection capability of polarization state, cloud, precipitation, wind shear and turbulence is developed, and the detection of the large air parameter of a single coherent laser radar is realized.

However, the performance of the current commercial laser radar still has many defects, such as small field angle, incapability of realizing three-dimensional detection, incapability of detecting a target and the like. Aiming at the detection of atmosphere and high-speed targets with high-speed change, a single photon detection laser radar with large-field-of-view detection capability for simultaneously detecting the atmosphere and the targets is required.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a multi-beam single-photon detection laser radar to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme:

a multi-beam single photon detection laser radar comprises a seed light laser, a fiber isolator, an acousto-optic modulator, a first pulse fiber amplifier, a multi-channel fiber beam splitter, a pulse fiber amplifier, a circulator, a multi-beam transceiver telescope, a single photon detector and a multi-channel digital acquisition card, wherein a light source point of the seed light laser is connected with the input end of the fiber isolator through an optical fiber, the output end of the fiber isolator is connected with the signal input end of the acousto-optic modulator through an optical fiber, the signal output end of the acousto-optic modulator is connected with the signal input end of the first pulse fiber amplifier through an optical fiber, the signal output end of the first pulse fiber amplifier is connected with the signal input port of the multi-channel fiber beam splitter through an optical fiber, the output port of the multi-channel fiber beam splitter is connected with the input ports of N second pulse fiber amplifiers through an optical fiber, the output ports of the N second pulse optical fiber amplifiers are respectively connected with the first ports of the N circulators through optical fibers, the second ports of the N circulators are connected with the multi-beam transceiver telescope through optical fibers, the third ports of the N circulators are connected with the input port of the single photon detector through optical fibers, and the output port of the single photon detector is electrically connected with the multi-channel digital acquisition card.

Preferably, the multi-beam transceiver telescope forms a sector space laser linear array.

Preferably, the modulation result of the acousto-optic modulator is pulsed light.

Preferably, the wavelength output by the seed light laser can be ultraviolet light, visible light or infrared light.

Preferably, the single photon detector is a Si APD detector, a PMT detector, an InGaAs APD detector, a frequency up-conversion single photon detector or a superconducting nanowire single photon detector.

Preferably, the optical fiber coupled with the multi-beam transceiver telescope is a multimode optical fiber.

Compared with the prior art, the utility model has the beneficial effects that:

1. the utility model adopts large-view-field multi-line laser output, and can simultaneously detect the target distance, elevation angle, azimuth and wind field of N view fields;

2. the utility model adopts the laser multi-line output with a large field angle, thereby ensuring the detection distance and simultaneously enlarging the detection field angle range;

3. the utility model is matched with a horizontal scanning device, and can realize high-speed three-dimensional space atmosphere and target detection;

4. the utility model adopts the method that a single seed optical laser drives N laser amplifiers, thereby saving the cost of a plurality of seed optical lasers.

Drawings

FIG. 1 is a system block diagram of the present invention.

In the figure: the system comprises a seed light laser A, a fiber optic isolator B, an acousto-optic modulator C, a first pulse fiber amplifier D, a multi-channel fiber beam splitter E, a pulse fiber amplifier F, a circulator G, a multi-beam transceiving telescope H, a single photon detector I and a multi-channel digital acquisition card J.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1, the present invention provides a technical solution: a multi-beam single photon detection laser radar comprises a seed light laser A, a fiber isolator B, an acousto-optic modulator C, a first pulse fiber amplifier D, a multi-channel fiber beam splitter E, a pulse fiber amplifier F, a circulator G, a multi-beam transceiver telescope H, a single photon detector I and a multi-channel digital acquisition card J, wherein a light source point of the seed light laser A is connected with the input end of the fiber isolator B through an optical fiber, the output end of the fiber isolator B is connected with the signal input end of the acousto-optic modulator C through an optical fiber, the signal output end of the acousto-optic modulator C is connected with the signal input end of the first pulse fiber amplifier D through an optical fiber, the signal output end of the first pulse fiber amplifier D is connected with the signal input port of the multi-channel fiber beam splitter E through an optical fiber, the output port of the multi-channel fiber beam splitter E is connected with the input ports of N second pulse fiber amplifiers F through an optical fiber, the output ports of the N second pulse optical fiber amplifiers F are respectively connected with the first ports of the N circulators G through optical fibers, the second ports of the N circulators G are connected with the multi-beam transceiver telescope H through optical fibers, the third ports of the N circulators G are connected with the input port of the single-photon detector I through optical fibers, and the output port of the single-photon detector I is electrically connected with the multi-channel digital acquisition card J.

Specifically, the multi-beam transceiver telescope H forms a sector spatial laser line array.

Specifically, the modulation result of the acousto-optic modulator C is pulsed light, which is modulated into coded quasi-continuous pulsed light in the present embodiment.

Specifically, the wavelength output by the seed light laser a may be ultraviolet light, visible light, or infrared light.

Specifically, the single photon detector I is a Si APD detector, a PMT detector, an InGaAs APD detector, a frequency up-conversion single photon detector or a superconducting nanowire single photon detector.

Specifically, the optical fiber coupled to the multi-beam transceiver telescope H is a multimode optical fiber.

Based on a multi-beam single photon detection laser radar, the device work flow comprises the following steps:

step 1, generating single-mode narrow-linewidth frequency-stabilized continuous light by a seed light laser A;

step 2, isolating the single-mode narrow-linewidth frequency-stabilized continuous light through an optical fiber isolator B;

step 3, enabling the isolated single-mode narrow-linewidth frequency-stabilized continuous light to enter an acousto-optic modulator C, and modulating the acousto-optic modulator C to obtain pulsed light;

step 4, leading the pulse light into a first pulse optical fiber amplifier D through an optical fiber, and performing power amplification through the first pulse optical fiber amplifier D to obtain first power amplification pulse light;

step 5, equally dividing the first power amplification pulse light through a multi-channel optical fiber beam splitter E to obtain N pulse light with equal power;

step 6, the N pulse lights with equal power flow to the corresponding second pulse optical fiber amplifiers F respectively and independently, and the split pulse lights flowing in the pulse light amplifiers are amplified again through the corresponding second pulse optical fiber amplifiers F to obtain secondary power amplification pulse lights;

step 7, leading the N strands of second power amplification pulse light into a corresponding circulator G through an optical fiber, and carrying out unidirectional isolation on the second power amplification pulse light by the circulator G;

step 8, a second port of the circulator G guides the second power amplification pulse light to the multi-beam transceiver telescope H through the optical fiber, then the second power amplification pulse light array is transmitted through the multi-beam transceiver telescope H, and the reflected pulse light is received;

9, returning and feeding back the reflected pulse light to the circulator G through the multimode fiber, and then leading out the reflected pulse light through a third port of the circulator G to obtain feedback pulse light;

step 10, feeding the feedback pulse light into a single-photon detector I through an optical fiber, and inducing the feedback pulse light through the single-photon detector I to obtain an induced electrical signal;

and 11, the single-photon detector I guides the induction electric signals to a multi-channel digital acquisition card for electric signal processing and acquisition.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as mature bolts, rivets, welding and the like in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a multi-beam single photon detection laser radar, includes seed light laser A, fiber isolator B, acoustic optical modulator C, first pulse fiber amplifier D, multichannel fiber beam splitter E, pulse fiber amplifier F, circulator G, multi-beam transceiver telescope H, single photon detector I and multichannel digital acquisition card J, its characterized in that: the light source point of the seed optical laser A is connected with the input end of an optical fiber isolator B through an optical fiber, the output end of the optical fiber isolator B is connected with the signal input end of an acousto-optic modulator C through an optical fiber, the signal output end of the acousto-optic modulator C is connected with the signal input end of a first pulse optical fiber amplifier D through an optical fiber, the signal output end of the first pulse optical fiber amplifier D is connected with the signal input port of a multi-channel optical fiber beam splitter E through an optical fiber, the output port of the multi-channel optical fiber beam splitter E is connected with the input ports of N second pulse optical fiber amplifiers F through optical fibers, the output ports of the N second pulse optical fiber amplifiers F are respectively connected with the first ports of N circulators G through optical fibers, the second ports of the N circulators G are connected with a multi-beam transceiver telescope H through optical fibers, and the third ports of the N circulators G are connected with the input port of a single photon detector I through optical fibers, and an output port of the single photon detector I is electrically connected with a multi-channel digital acquisition card J.

2. The multi-beam single photon detection lidar of claim 1, wherein: the multi-beam transceiver telescope H forms a sector space laser linear array.

3. The multi-beam single photon detection lidar of claim 1, wherein: the modulation result of the acousto-optic modulator C is pulse light.

4. The multi-beam single photon detection lidar of claim 1, wherein: the wavelength output by the seed light laser A can be ultraviolet light, visible light or infrared light.

5. The multi-beam single photon detection lidar of claim 1, wherein: the single photon detector I is a Si APD detector, a PMT detector, an InGaAs APD detector, a frequency up-conversion single photon detector or a superconducting nanowire single photon detector.

6. The multi-beam single photon detection lidar of claim 1, wherein: the optical fiber coupled with the multi-beam transceiver telescope H is a multimode optical fiber.