An integrated wind lidar system

Abstract

The utility model discloses an integrated wind measurement laser radar system relates to radar system field. The integrated wind measurement laser radar system includes integrated module, and the integrated module includes; Seed chip, the signal light that seed laser cooperates seed chip sends out, is divided into the mirror and the circulator core through the light splitting sheet, Pump laser chip, by pump laser and pump laser chip cooperation work emit light, and the light signal is after the light wave combination of filter sheet and circulator core light after filter sheet enters the optical amplifier, and the light is after amplification and enters the circulator. Through adopting integrated module light source, the multiple functions of seed, pump laser, wave division, circulator etc. are realized, and the degree of integration is high, and the device quantity reduces, and the occupied volume reduces, and the multiple melting point of discrete device is reduced, and the process is simple, and the cost is reduced, and the reliability is promoted, and the modulation reflector is integrated acoustooptic modulator and reflector, realizes the bidirectional modulation function, and simultaneously adopts the chip detection module, and integrates the optical splitter and the detector, realizes the function of balanced detector.

Description

Technical Field

[0001] This utility model relates to the field of radar system technology, specifically to an integrated wind-measuring lidar system. Background Technology

[0002] Anemometers and lidar are two commonly used methods for measuring wind speed and direction. With increasing demands for power generation efficiency and blade protection in wind turbines, lidar for forward feedback in wind turbine control is becoming increasingly important. Lidar is the optimal solution for wind turbine control.

[0003] Traditional wind lidar typically uses fiber lasers as its laser source. However, the optical components in fiber lasers, such as seed sources, beam splitters, and pump lasers, are all made by splicing discrete components together. This results in problems such as multiple melting points, long processing time, large size, and low reliability.

[0004] This invention employs multiple integrated optical device solutions, reducing melting point and labor time, improving product integration, lowering costs, and reducing size. As the application scenarios of lidar expand, such as low-altitude economic applications, UAV mapping, vehicle-mounted lidar, and military handheld lidar, higher requirements are placed on the size and weight of lidar systems. Therefore, this invention can be applied to such scenarios. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model proposes an integrated wind lidar system, which solves the problems of discrete component welding, multiple melting points, long construction time, and low reliability in existing wind lidar systems.

[0006] To solve the above-mentioned technical problems, the basic technical solution proposed by this utility model is as follows: an integrated wind-measuring lidar system, including an integrated module, wherein the integrated module includes a seed chip, and the signal light emitted by the seed laser and the seed chip is split into the reflector and the circulator core by a beam splitter. The pump laser and the pump laser chip work together to emit light, and the light signal is combined with the light at the circulator core by a filter and then enters the optical amplifier after passing through the filter. After amplification, the light enters the circulator.

[0007] Preferably, the light emitted by the seed laser in conjunction with the seed chip is dispersed into two locations—a reflector and a circulator core—by a lens and an isolator. The light signal dispersed at the reflector then enters the signal processing module via a single-core collimator. The circulator core, together with the single-core collimator and the modulation reflector, forms a radio frequency drive.

[0008] Preferably, the light emitted by the pump laser and the pump laser chip is processed by a fast-axis lens and a slow-axis lens, and then passes through a filter, a circulator core, and a reflector before entering the single-core collimator. The light signal emitted from the other path of the circulator core and the light emitted by the pump laser are combined after passing through the filter and then enter the optical amplifier. After amplification, the light signal enters the circulator and interacts with the optical antenna. Subsequently, the signal inside the circulator merges with the signal in the integrated module light source and enters the signal processing module, where it is used for beat frequency detection with the light separated from the integrated module light source.

[0009] Preferably, the optical signal is driven by an integrated module light source through a modulation reflector to generate radio frequency drive, and the integrated module light source is driven by an optical amplifier and a circulator and enters the signal processing module through an optical antenna.

[0010] Preferably, the modulated reflector includes a housing, a reflector is disposed inside the housing, and the optical signal is transmitted from the reflector and the acousto-optic crystal to the radio frequency driver. A lens is disposed inside the housing to collimate the optical path, thereby facilitating optical path adjustment.

[0011] Preferably, the signal processing module includes a dual-core fiber array and an integrated chip. The integrated chip includes a 50:50 beam splitter and two photodiode regions, realizing optical mixing and dual-path detection functions.

[0012] The beneficial effects of this utility model are: The technical solution of this utility model, by adopting an integrated modular light source, realizes multiple functions such as seed, pump laser, wavelength division multiplexing, and circulator. It has a high degree of integration, reduces the number of components, reduces the volume occupied, reduces the multiple melting points of discrete components, simplifies the process, reduces costs, and improves reliability. The modulation reflector integrates an acousto-optic modulator and a reflector, realizing bidirectional modulation function. It can be applied to application scenarios with higher requirements for system size and weight, such as low-altitude economic, UAV mapping, vehicle-mounted lidar, and military handheld lidar. At the same time, the use of a modulation reflector realizes the integration of modulation and reflector, reduces melting points, and adopts a chip-based balanced detection module. By using integrated devices in the lidar system, it achieves advantages such as high integration, miniaturization, and low cost. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1This is a flowchart of the overall system of this utility model; Figure 2 This is a simplified optical path flowchart for this utility model; Figure 3 This is a schematic diagram of the modulated reflector structure of this utility model. Figure 4 This is a schematic diagram of the signal processing module of this utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] This application provides an integrated wind lidar system, which solves the problems of existing wind lidar systems, such as discrete component welding, multiple welding points, long construction time, and low reliability.

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0018] According to the appendix Figures 1-4 As shown, it includes an integrated module, which includes a seed chip. The signal light emitted by the seed laser and the seed chip is split into the reflector and the circulator core by a beam splitter. The pump laser and the pump laser chip work together to emit light. The light signal passes through a filter and is combined with the light at the circulator core. After passing through the filter, it enters the optical amplifier. After being amplified, the light enters the circulator.

[0019] The light emitted by the seed laser and seed chip is dispersed by a lens and isolation plate into two locations: a reflector and a circulator core. The light signal dispersed at the reflector enters the signal processing module through a single-core collimator. The circulator core, together with the single-core collimator and the modulation reflector, forms an RF drive. The light emitted by the pump laser and pump laser chip is processed by a lens and then passes through a filter, the circulator core, and the reflector before entering the single-core collimator. The other light signal emitted from the circulator core and the light emitted by the pump laser are combined after passing through a filter and then enter the optical amplifier. After amplification, the light signal enters the circulator and interacts with the optical antenna. Subsequently, the signal inside the circulator merges with the signal in the integrated module light source and enters the signal processing module, where it is beat-frequency detected with the light split from the integrated module light source.

[0020] The optical signal is driven by the integrated module light source through the modulation reflector. The integrated module light source is then amplified by an optical amplifier and circulator, and enters the signal processing module through an optical antenna. The modulation reflector includes a housing with a reflector inside. The optical signal is transmitted to the RF driver through the reflector and acousto-optic crystal. A lens is installed inside the housing to collimate the optical path and facilitate optical path adjustment. The signal processing module includes a dual-core fiber array and an integrated chip. The integrated chip contains a 50:50 beam splitter and two photodiode regions, realizing optical mixing and two-way detection functions.

[0021] The integrated modular light source adopts a spatial optical path coupling structure, mainly including a seed laser, a pump laser, a beam splitter, a circulator, and wavelength division multiplexing (WDM). The seed laser, in conjunction with a seed chip, emits light that is split into two paths by a beam splitter. The light source wavelength can be 1064nm / 1550nm, etc. One path serves as the local oscillator light directly connected to the signal processing module, while the other path serves as the signal light. The signal light passes through the circulator and enters the modulation reflector. The modulation reflector frequency-shifts the light and simultaneously forms a pulsed light, which is then directly reflected internally. This pulsed light then enters the circulator core within the integrated modular light source and exits from the other path of the circulator core, where it interacts with the 974nm wavelength emitted by the pump laser. Light of nm or 976nm, etc., after passing through the filter, achieves two-way optical wave combination and enters the optical amplifier. The pulsed light is amplified and enters the circulator, and then hits the atmosphere through the optical antenna. The returning light enters the detection module through the circulator and beats the local oscillator light split from the integrated module light source to calculate parameters such as wind speed and wind direction. The system uses integrated devices and adopts a spatial optical path coupling structure. It mainly includes seed laser, pump laser, beam splitter, circulator and wavelength division multiplexing functions. Compared with the traditional scheme of using discrete device welding, it reduces multiple melting points, reduces the overall volume, shortens the manufacturing time and improves product reliability. [3] Compared with the traditional modulation and mirror fusion, this device achieves bidirectional frequency shifting of a single device, integrating the functions of an acousto-optic modulator and a mirror, realizing the frequency shifting and chopping of signal light. The lens collimates the optical path to facilitate optical path adjustment. Various materials can be selected for the acousto-optic crystal. Tellurium dioxide is the preferred material for acousto-optic modulators due to its high quality factor and low attenuation coefficient. The reflector is placed at the position of the first-order diffraction beam of the acousto-optic crystal, maintaining a distance from the end face to prevent interference with the 0th-order beam.

[0022] The processing module consists of a dual-core fiber array and an integrated chip. The integrated chip includes a 50:50 splitter and two photodiode areas, which realize the functions of optical mixing and dual-path detection, and achieve the function of balanced detection and data acquisition. Information such as wind speed can be obtained through subsequent algorithm processing.

[0023] In summary, compared with existing technologies, it has the following beneficial effects: By adopting an integrated modular light source, multiple functions such as seed, pump laser, wavelength division multiplexing, and circulator are realized. The integration level is high, the number of components is reduced, the volume is reduced, multiple melting points of discrete components are reduced, the process is simplified, the cost is reduced, and the reliability is improved. The modulation reflector integrates an acousto-optic modulator and a reflector, realizing bidirectional modulation function. It can be applied to application scenarios with higher requirements for system size and weight, such as low-altitude economic, UAV mapping, vehicle-mounted lidar, and military handheld lidar. At the same time, the modulation reflector is used to realize the integration of modulation and reflector, reduce melting points, and adopt chip-based balanced detection module. By using integrated devices in the lidar system, it achieves advantages such as high integration, miniaturization, and low cost.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An integrated wind-measuring lidar system, characterized in that, Includes an integration module, the integration module comprising; The seed chip and the signal light emitted by the seed laser are split by a beam splitter and directed to the reflector and the ring core. The pump laser chip works in conjunction with the pump laser to emit light. The light signal passes through a filter and is combined with the light at the circulator core. After passing through the filter, the light enters the optical amplifier. The light is then amplified and enters the circulator.

2. The integrated wind-measuring lidar system according to claim 1, characterized in that: The light emitted by the seed laser in conjunction with the seed chip is dispersed into two locations—a reflector and a circulator core—by a lens and an isolator. The light signal dispersed at the reflector then enters the signal processing module via a single-core collimator. The circulator core, together with the single-core collimator and the modulation reflector, forms a radio frequency drive.

3. The integrated wind-measuring lidar system according to claim 2, characterized in that: The light emitted by the pump laser and the pump laser chip is processed by a fast-axis lens and a slow-axis lens, and then passes through a filter, a circulator core, and a reflector before entering the single-core collimator. The light signal emitted from the other path of the circulator core and the light emitted by the pump laser are combined after passing through a filter and then enter the optical amplifier. After amplification, the light signal enters the circulator and interacts with the optical antenna. Subsequently, the signal inside the circulator merges with the signal in the integrated module light source and enters the signal processing module, where it is used for beat frequency detection with the light separated from the integrated module light source.

4. The integrated wind-measuring lidar system according to claim 3, characterized in that: The optical signal is transmitted from the integrated module light source to the circulator of the integrated module light source after passing through the modulation reflector. The modulation reflector modulates the signal through the radio frequency driver. The integrated module light source passes through the optical amplifier and, together with the circulator, enters the signal processing module using the optical antenna.

5. The integrated wind-measuring lidar system according to claim 4, characterized in that: The modulated reflector includes a housing, inside which a reflector is disposed. The optical signal is transmitted from the reflector and an acousto-optic crystal to the radio frequency driver. A lens is disposed inside the housing to collimate the optical path, thereby facilitating optical path adjustment.

6. The integrated wind-measuring lidar system according to claim 5, characterized in that: The signal processing module structure includes an optical fiber array and an integrated chip. The integrated chip contains a beam splitter and a photodiode area, realizing the functions of optical mixing and two-way detection.

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