An imaging calibration active light emitting system

Abstract

The application discloses a kind of imaging calibration active light emitting systems, and belongs to the technical field of test calibration equipment, specifically, including laser radar, photoelectric detector, amplifier, controller, fiber laser, WDM wavelength division multiplexer, fiber attenuator;The light emitted by laser radar is attenuated by attenuating sheet and received by photoelectric detector, and the optical signal is converted into electrical signal, then the transmission signal is amplified and shaped after amplifier;Controller controls signal output fiber laser to emit light source, and the front-end optical isolator of emission light source can isolate the light reflected by optical fiber echo;Wavelength of WDM wavelength division multiplexer is transmitted, and fiber attenuator is added in transmission process;The transmitted light is emitted to laser radar after collimating by collimating mirror from the channel of optical switch opened by control system. The application measures the distance of more than two points, and knows the movement speed of object according to time change rate, to improve the precision of positioning, search and imaging and other indexes of laser radar.

Description

Technical Field

[0001] This invention relates to the field of testing and calibration equipment technology, specifically to an imaging calibration active light emission system. Background Technology

[0002] Test calibration equipment can simulate the transmission of radar and jamming signals, and then perform far-field whole-machine calibration on the target object. Based on the calibration results, corresponding processing is carried out. It has good application prospects in the field of communications and plays an increasingly important role.

[0003] Current testing and calibration equipment cannot meet the accuracy calibration requirements of lidar, and there is no such equipment on the market. Therefore, there is an urgent need to customize an imaging calibration active light emission system to improve the accuracy of lidar's positioning, search, and imaging performance. Thus, it is necessary to develop an imaging calibration active light emission system. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0006] An imaging calibration active light emission system, comprising:

[0007] LiDAR, photodetectors, amplifiers, controllers, fiber lasers, WDM wavelength division multiplexers, fiber optic attenuators;

[0008] The light emitted by the lidar is attenuated by the attenuator and then received by the photodetector, which converts the optical signal into an electrical signal. The signal is then amplified and shaped by the amplifier before being transmitted.

[0009] The controller outputs a control signal to the fiber laser emission source, and the optical isolator at the front end of the emission source can isolate the light reflected by the fiber optic echo.

[0010] The light is transmitted through the wavelength of the WDM wavelength division multiplexer, and the fiber optic attenuator is added during the transmission process.

[0011] The transmitted light is collimated by a collimating lens after passing through the channel of the optical switch opened by the control system and then emitted to the lidar.

[0012] As a preferred embodiment of the imaging calibration active light emission system described in this invention, it further includes the following modules: a 64-channel laser array transceiver system, a 1064nm laser, a 1550nm laser, and a laser emission point array signal control system.

[0013] As a preferred embodiment of the imaging calibration active light emission system of the present invention, the imaging calibration active light emission system calibrates the precise azimuth angle and distance between target points scanned by the lidar beam, including angular measurement calibration and line measurement calibration, and inputs the azimuth and angle changes and time changes during the target movement process into the control unit.

[0014] As a preferred embodiment of the imaging calibration active light emission system described in this invention, the 64-channel laser array transceiver system comprises an 8×8 transceiver optical array, a 64-channel fiber optic transmission system, a high-speed array detector, and a signal processing unit.

[0015] As a preferred embodiment of the imaging calibration active light emission system described in this invention, each receiving and transmitting system consists of a separate laser and a receiver. Each channel can be individually controlled to receive signals and, after internal signal delay, emits an echo laser pulse signal.

[0016] As a preferred embodiment of the imaging calibration active light emission system described in this invention, the 1064nm laser and 1550nm laser, coupled with host computer software, can realize internal triggering function; the output of 64 lasers can be controlled independently, and different lasers can output light simultaneously, with the input pulse width and peak optical power of each laser being adjustable; the external triggering function is to control the output of 64 lasers through the external triggering input interface, and the peak optical power of each laser can be adjusted by software.

[0017] As a preferred embodiment of the imaging calibration active light emission system described in this invention, the laser light emission point array signal control system can emit laser signals with different time delays, different light intensities, and different pulse forms according to calibration requirements.

[0018] As a preferred embodiment of the imaging calibration active light emission system described in this invention, the laser emission point array signal control system is used to precisely control the delay, intensity, and pulse width information of the laser point array emission. The delay control converts the laser signal from the lidar into an electrical signal, delays it by time τ through a delay controller, and then triggers the emission of the corresponding laser point to simulate a far-field target in the laboratory.

[0019] Compared with existing technologies, the advantages of this invention are: by multiple scans and receptions, all data of the target point can be obtained; after imaging data processing, the time data of the measurement points can be added to realize a three-dimensional image. Furthermore, by measuring the distance between two or more points and determining the object's speed based on the rate of change over time, the accuracy of the lidar's positioning, search, and imaging performance can be improved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0021] Figure 1 This is a schematic diagram illustrating the implementation process of the present invention;

[0022] Figure 2 This is a schematic diagram of the 64-channel laser array transceiver system of the present invention;

[0023] Figure 3 This is a system block diagram of the host computer and the laser of the present invention;

[0024] Figure 4 This is a system block diagram of the present invention. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] Please see Figures 1-4The diagram shown is a structural schematic of an embodiment of the active light emission system for imaging calibration according to the present invention. Please refer to [link / reference]. Figures 1-4 This paper provides a detailed introduction to an active light emission system for imaging calibration.

[0030] An imaging calibration active light emission system, including

[0031] LiDAR, photodetectors, amplifiers, controllers, fiber lasers, WDM wavelength division multiplexers, fiber optic attenuators;

[0032] The light emitted by the lidar is attenuated by an attenuator and then received by a photodetector, which converts the optical signal into an electrical signal. The signal is then amplified and shaped by amplifiers and other devices before being transmitted. The controller outputs a signal to cause one of the fiber lasers to emit light. An optical isolator at the front end of the light source isolates the light reflected back through the fiber. The light is then transmitted through a WDM wavelength division multiplexer. Because the optical power may be too high, an optical fiber attenuator is added during transmission. The light then passes through the optical switch opened by the control system, is collimated by a collimating lens, and is emitted to the lidar, thereby calibrating the lidar.

[0033] The entire imaging calibration active light emission system mainly consists of the following modules: a 64-channel laser array transceiver system, a 1064nm laser, a 1550nm laser, and a laser emission point array signal control system. The imaging calibration active light emission system calibrates the precise azimuth angles and distances between target points scanned by the lidar beam, including angular measurement calibration and line measurement calibration. During the calibration process, the azimuth and angle changes and time changes during target movement are input into the control unit, which calculates and provides the original standard measurement data. This provides the lidar with standard positioning measurement values ​​before it leaves the factory, ensuring the validity and accuracy of the data measured during future use of the lidar.

[0034] The 64-channel laser array transceiver system consists of an 8×8 receiving and transmitting optical array, a 64-channel fiber optic transmission system, a high-speed array detector, and a signal processing unit. Each receiving and transmitting system has a separate laser and receiver. Each channel can be controlled to receive signals independently and transmit echo laser pulse signals after internal signal delay. Multiple channels or all channels can be selected to receive and transmit echo pulse signals.

[0035] The 1064nm and 1550nm lasers, paired with host computer software, can achieve internal triggering: individual control of 64 laser output channels, with different lasers capable of simultaneous output, and adjustable input pulse width and peak optical power for each laser channel. External triggering: control of the 64 laser output channels via an external trigger input interface, with software adjustment of the peak optical power for each laser channel.

[0036] The laser emission array signal control system can emit laser signals with different time delays, intensities, and pulse formats according to calibration requirements. This system precisely controls the emission delay, intensity, and pulse width of the laser array to simulate different targets and working scenarios. Delay control is the core of this system. It converts the laser signal from the lidar into an electrical signal, delays it by a time τ using a delay controller, and then triggers the corresponding laser point to emit light, enabling the simulation of far-field targets in the laboratory.

[0037] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An imaging calibration active light emitting system, comprising: It comprises: Laser radar, photoelectric detector, amplifier, controller, fiber laser, WDM wavelength division multiplexer, fiber attenuator; The light emitted by the laser radar is attenuated by the attenuator and received by the photoelectric detector to convert the light signal into an electrical signal, which is then amplified and shaped by the amplifier before being transmitted; The controller controls the signal output of the fiber laser to emit light source, and the front-end optical isolator can isolate the light reflected by the optical fiber; The wavelength of the light transmitted by the WDM wavelength division multiplexer is increased by the fiber attenuator during transmission; The transmitted light is emitted to the laser radar after collimation by the collimating mirror through the channel of the optical switch opened by the control system.

2. An imaging calibration active light emitting system according to claim 1, wherein: It also includes the following modules: 64-channel laser array transceiver system, 1064nm laser, 1550nm laser, and laser light point array signal control system.

3. An imaging calibration active light emitting system according to claim 2, wherein: The imaging calibration active light emitting system calibrates the precise azimuth angle and distance between the target points scanned by the laser radar beam, including angle measurement calibration and line measurement calibration, and inputs the azimuth and angle changes in the target motion process and time change data into the control unit.

4. An imaging calibration active light emitting system according to claim 3, wherein: The components of the 64-channel laser array transceiver system include an 8x8 receiving and transmitting optical array, a 64-channel optical fiber transmission system, a high-speed array detector, and a signal processing unit.

5. An imaging calibration active light emitting system according to claim 4, wherein: Each receiving and transmitting system has a separate laser and receiver, and each channel can be controlled independently to receive signals and transmit echo laser pulse signals after internal signal delay.

6. An imaging calibration active light emitting system according to claim 3, wherein: The 1064nm laser and 1550nm laser can realize internal triggering function with PC software; 64-channel laser output can be controlled separately, different channels can emit light at the same time, and the input pulse width and peak optical power of each channel can be adjusted; external triggering function is to control 64-channel laser output through external triggering input interface, and software adjusts the peak optical power of each laser.

7. An imaging calibration active light emitting system according to claim 6, wherein: The laser light point array signal control system can emit laser signals with different time delays, different light intensities, and different pulse forms according to calibration requirements.

8. An imaging calibration active light emitting system according to claim 7, wherein: The laser light point array signal control system is used to accurately control the delay, intensity, and pulse width information of the laser point array light emission, and the delay control in it converts the laser signal from the laser radar into an electrical signal, delays the time τ through the delay controller, and then triggers the corresponding laser point to emit light, simulating a far-field target in the laboratory.

Images