CN-121995391-A - Infrared biological detection radar module, detection method, device, equipment and medium thereof

CN121995391ACN 121995391 ACN121995391 ACN 121995391ACN-121995391-A

Abstract

The embodiment of the invention provides an infrared biological detection radar module, and a detection method, a detection device, detection equipment and detection media thereof. The infrared biological detection radar module comprises a shell, a static sensing component, a polyhedral rotary reflection component, a zero sensor and a driving motor, wherein the shell is provided with an infrared anti-reflection window which is obliquely arranged, the static sensing component comprises an infrared emission array and a receiving array, a collimated infrared beam emitted by the infrared emission array passes through the infrared anti-reflection window to form a scanning beam after being deflected by the polyhedral rotary reflection component, an echo signal is reflected by the same reflection surface and returns to the receiving array, the polyhedral rotary reflection component enables the emergent beam to generate layered jump in the vertical direction in the horizontal rotation process to form a multi-layer overlapped three-dimensional scanning field, the driving motor is used for driving the polyhedral rotary reflection component to rotate, and the zero sensor is used for providing a rotary reference datum position. Based on the method, the embodiment of the invention can realize three-dimensional space detection under the condition of compact volume, meanwhile, no conductive slip ring is required to be configured, and the precise identification of the micro biological target can be realized.

Inventors

FENG QI
LUO HUIXIN
ZHAO JING
LIN PEILONG
ZHANG CHI
WU PANPAN
DENG FUQIN
LIU HONGKAI
LIN ZHANCHANG
XU JIARUN

Assignees

五邑大学

Dates

Publication Date: 20260508
Application Date: 20260324

Claims (10)

1. An infrared biological detection radar module, comprising: The infrared reflection increasing window is obliquely arranged on the shell, so that the specular reflection light on the surface of the infrared reflection increasing window deviates from the direction of the receiving optical axis; The static sensing assembly is fixedly arranged on the inner wall of the shell and comprises an infrared emission array and a receiving array, the infrared emission array and the receiving array are arranged on the same side of the inner wall of the shell side by side, and an opaque partition plate is arranged between the infrared emission array and the receiving array; The polyhedron rotating and reflecting assembly is positioned on the central axis of the shell, and is provided with a plurality of reflecting surfaces, and the included angles between at least part of adjacent reflecting surfaces and the corresponding rotating axes of the polyhedron rotating and reflecting assembly are different from each other, so that the outgoing light beam can generate layered jump in the vertical direction in the horizontal rotating process of the polyhedron rotating and reflecting assembly, and a multi-layer overlapped three-dimensional scanning field is formed; The driving motor is used for driving the polyhedron rotary reflection assembly to rotate; The zero sensor is used for providing a rotary reference datum position for the polyhedral rotary reflecting component; And the control unit is used for carrying out pulse width and signal intensity characteristic analysis on the echo signals and matching with a preset biological characteristic template so as to screen and output three-dimensional space coordinates of the effective target.
2. The infrared biological detection radar module of claim 1, wherein the polyhedral rotary reflection assembly further comprises a dynamic balance structure disposed in a non-optical functional area of the reflection surface, and wherein a rotational centroid of the polyhedral rotary reflection assembly coincides with the central axis through mass compensation or de-duplication processing.
3. The infrared biological detection radar module of claim 1, wherein the infrared emission array is a vertical cavity surface emitting laser array and the receiving array is an avalanche photodiode array or a single photon avalanche diode array.
4. The infrared biological detection radar module according to claim 1, wherein a collimating emission lens is installed in front of the infrared emission array, a collimating receiving lens is installed in front of the receiving array, and an emission optical axis of the infrared emission array is parallel to a receiving optical axis of the receiving array, so that the emission optical axis and the receiving optical axis form a quasi-coaxial optical path arrangement.
5. The infrared biological detection radar module according to claim 1, wherein the number of reflecting surfaces of the polyhedral rotary reflecting assembly is N, and the inclination angles of the reflecting surfaces relative to the rotation axis are arranged according to a preset cyclic sequence, so that the polyhedral rotary reflecting assembly generates N scanning layers with different pitch angles in the process of horizontally rotating for one circle, wherein N is more than or equal to 3.
6. A detection method of an infrared biological detection radar module, characterized in that it is applied to an infrared biological detection radar module according to any one of claims 1 to 5, the method comprising: establishing a rotary reference datum through the zero sensor; Continuously emitting pulse laser through the infrared emission array, and forming multilayer stereoscopic scanning in a target space after the pulse laser is deflected by the polyhedral rotary reflection assembly; Collecting echo signals through the receiving array, and recording arrival time stamps of effective echo signals each time relative to the rotary reference standard; Based on the mapping relation between the arrival time stamp and the rotation phase of the driving motor, calculating a horizontal azimuth angle and a corresponding vertical hierarchy coordinate of a target, and calculating a target distance according to flight time, wherein the flight time is the time difference between the transmitting time of each pulse laser transmitted by the infrared transmitting array and the arrival time of an echo signal; and carrying out pulse width and signal intensity characteristic analysis on the echo signals, and matching with a preset biological characteristic template to screen and output three-dimensional space coordinates of the effective target.
7. The method of claim 6, wherein the method further comprises: Extracting high-frequency modulation characteristics of the echo signals to obtain signal amplitude fluctuation characteristics; And determining the confidence coefficient of the target flying organism according to the signal amplitude fluctuation characteristics.
8. A detection device, comprising: The reference establishing module is used for establishing a rotary reference through the zero sensor; the pulse scanning module is used for continuously emitting pulse laser through the infrared emission array, and forming multilayer stereoscopic scanning in the target space after being deflected by the polyhedral rotating reflection assembly; the signal capturing module is used for acquiring echo signals through the receiving array and recording arrival time stamps of effective echo signals each time relative to the rotary reference standard; The space resolving module is used for resolving the horizontal azimuth angle and the corresponding vertical level coordinate of the target based on the mapping relation between the arrival time stamp and the rotation phase of the driving motor, and resolving the distance of the target according to the flight time, wherein the flight time is the time difference between the transmitting time of each transmitting pulse laser of the infrared transmitting array and the arrival time of an echo signal; the feature identification module is used for carrying out pulse width and signal intensity feature analysis on the echo signals and matching with a preset biological feature template so as to screen and output three-dimensional space coordinates of the effective target.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the detection method of an infrared biological detection radar module according to any one of claims 6 to 7 when executing the computer program.
10. A computer-readable storage medium storing computer-executable instructions for performing the detection method of the infrared biological detection radar module according to any one of claims 6 to 7.

Description

Infrared biological detection radar module, detection method, device, equipment and medium thereof Technical Field The embodiment of the invention relates to the technical field of radar detection, in particular to an infrared biological detection radar module, and a detection method, device, equipment and medium thereof. Background In application scenes such as intelligent environment monitoring, mobile killing robots and modern agriculture pest control, real-time detection and accurate positioning of micro-flight biological targets such as mosquitoes are key technical problems to be broken through at present. However, the prior art generally has limitations to varying degrees in achieving this goal. Although the traditional passive infrared detection technology (PIR) has a simple structure and low cost, the working principle of the PIR can only sense whether a heat source moves in a detection area or not, and can not provide space coordinate information such as the distance, the azimuth and the like of a target, so that the PIR is difficult to support an accurate fixed-point disinfection or space positioning task. Meanwhile, the technology is sensitive to environmental temperature fluctuation and non-radiative heat disturbance (such as air flow and direct sunlight), and has high false alarm rate and insufficient stability. In addition, the focal length of the Fresnel lens of the PIR sensor is generally designed aiming at human scale targets, and the radiation sectional area of the Fresnel lens is insufficient for triggering effective response on small targets such as mosquitoes with the span of only 5-20 mm, so that the application of the technology in fine insect condition monitoring is fundamentally restricted. In contrast, active infrared correlation or reflection systems have an improved detection stability, but generally only one-dimensional punctiform or linear warning areas can be constructed. If effective area coverage is required, a large number of sensing units are required to be deployed, so that the system is complex in structure and large in size, and accurate three-dimensional space coordinate information is still difficult to acquire. Both of the above technologies do not specifically optimize for small flight biological targets with spans on the order of 5-20 mm, and have substantial limitations in terms of target scale suitability. Currently, the most mature technical solution in terms of spatial point cloud acquisition is mechanical rotary LiDAR (LiDAR). However, mechanically rotary lidars employ a typical architecture of integral optoelectronic module rotation. Such systems typically achieve circumferential scanning by driving a full photovoltaic module comprising transmitting and receiving units to rotate 360 °. However, this architecture has obvious inherent drawbacks. Firstly, in order to realize the electric power and signal transmission between the rotating part and the static base, the structure of the conductive slip ring is required to be relied on, and the slip ring works based on physical friction contact, so that the abrasion problem is difficult to avoid, and the service life of the system is seriously limited. In engineering practice, the Mean Time Between Failure (MTBF) of a rotary laser radar containing a conductive slip ring is usually between 1000 and 3000 hours, which is far lower than 10000 hours of a solid-state scheme, and electrical noise may be introduced to interfere with detection of weak echo signals. And secondly, the rotation of the whole photoelectric module brings about larger moment of inertia, which is unfavorable for the miniaturized design of the system, and also brings higher requirements on the performances of the motor and the bearing. More critical is that for tiny targets such as mosquitoes, the radar scattering sectional area (RCS) is only about-30 dBm < 2 > level, echo signals are extremely weak, and under the comprehensive influence of rotational vibration (the axial amplitude can reach tens of micrometers) and centrifugal force (the centrifugal acceleration at the end part is about 500g when the rotational radius is 50mm and the rotational speed is 3000 rpm), the light path collimation precision is difficult to stabilize at the micro radian level, and the signal to noise ratio is difficult to meet the effective detection requirement. Disclosure of Invention The embodiment of the invention provides an infrared biological detection radar module, a detection method, a detection device, detection equipment and detection media thereof, which can realize three-dimensional space detection capability under the condition of compact volume, simultaneously do not need to be provided with a conductive slip ring on which a traditional mechanical radar depends, and can accurately identify a tiny biological target. In a first aspect, an embodiment of the present invention provides an infrared biological detection radar module, including: The infrared reflecti