Active near-infrared photoelectric signature device and method

Abstract

The application discloses an active near-infrared photoelectric feature identification device and method, which comprises an LED near-infrared light source, an infrared light guide filter module, a reflector, an infrared double-convex lens, a digital micromirror module, a control system, a short-distance optical amplification module and a filter window. The LED near-infrared light source emits near-infrared light, the light path is changed through the infrared light guide filter module and the reflector, and then the light is amplified through the infrared double-convex lens and uniformly projected on the digital micromirror. The flipping of the micromirror is controlled according to the stored two-dimensional code pattern sequence, and optical dynamic coding is realized. The coded light is amplified through the short-distance optical amplification module and finally projected on the filter window. The application adopts a single infrared light source, dynamically encodes the incident infrared light through the digital micromirror device, realizes clear, dynamic and stable photoelectric feature display, and has the advantages of large loadable information amount, high spatial resolution, strong dynamic performance, high stability and low manufacturing cost.

Description

Technical Field

[0001] This invention belongs to the field of optoelectronic feature identification technology, specifically relating to an active near-infrared optoelectronic feature identification device and method. Background Technology

[0002] With the rapid development of materials and electronic science, the field of photoelectric feature recognition is undergoing technological innovation. Photoelectric feature recognition technology is a modern identification technology that uses photoelectric features to identify and locate targets. It can be applied to fields such as photoelectric wireless communication, target identification and navigation in specific environments, disaster relief in complex environments, and production safety in industry and mining. Based on whether the identification device actively emits photoelectric signals, photoelectric feature tags are divided into active and passive categories. Active photoelectric tags outperform passive photoelectric tags in various performance indicators, offering advantages such as longer communication distance, higher identification efficiency, larger information capacity, directional field-of-view transmission, and higher reliability.

[0003] Current active photoelectric feature identification technologies primarily utilize visible light, laser beams, and infrared light. Visible light has a distinct spectral range, making it unsuitable for long-distance photoelectric information transmission. Laser emitters are generally large and generate significant heat, and their overly conspicuous characteristics can harm the eyes. Compared to infrared light, near-infrared light, in particular, offers advantages such as strong environmental adaptability, high penetration, interference resistance, and good concealment. Existing infrared photoelectric feature identification devices mainly employ multiple infrared light sources arranged in an infrared light source array to achieve photoelectric information transmission and identification; however, this approach suffers from drawbacks such as high cost, low yield rate, significant heat generation, and poor reliability. Summary of the Invention

[0004] The present invention aims to propose an active near-infrared photoelectric feature identification device and method, solving the problems of high power consumption, severe heat generation, poor reliability, and high cost of existing photoelectric feature identification devices. The proposed photoelectric feature identification device uses a single infrared light source and employs a digital micromirror device (DMD) to perform high-precision dynamic encoding of the incident infrared light, achieving clear, dynamic, and stable display of photoelectric features. It boasts advantages such as large information capacity, high spatial resolution, strong dynamic performance, high stability, and low manufacturing cost.

[0005] The technical solution to achieve the purpose of this invention is: an active near-infrared photoelectric feature identification device, comprising an LED near-infrared light source, an infrared light guide filter module, a reflector, an infrared biconvex lens, a digital micromirror module, a control system, a short-distance optical magnification module, and a filter window;

[0006] The variable frequency infrared light source emits variable frequency infrared light, which is then directed to the infrared light guide and filter module.

[0007] The infrared light guide and filter module has the functions of guiding light, preventing infrared light from scattering, and filtering infrared light in other frequency bands.

[0008] Near-infrared light changes direction after being reflected by a mirror;

[0009] The light is magnified by an infrared biconvex lens and projected evenly onto the digital micromirror.

[0010] The digital micromirror consists of multiple small mirrors, each of which can be flipped to a set angle;

[0011] The control system controls the flipping of each mirror in the digital micromirror according to the target QR code graphic sequence, thereby realizing dynamic encoding of the incident light;

[0012] After being encoded by the digital micromirror, the light is magnified by the short-distance optical magnification module and projected onto the filtered viewing window.

[0013] Furthermore, the control system includes a control module, a storage module, and a communication module;

[0014] The control module uses a programmable gate array chip as the main control core to control the timing and operation logic of each module in the system, and acts as a digital optical processor to control the flipping of each micromirror.

[0015] The storage module stores a sequence of QR code images consisting of 0s and 1s;

[0016] The communication module is used to receive dynamic encoded graphics and control signals sent by a remote server in real time, so as to realize dynamic interactive photoelectric feature identification.

[0017] Furthermore, the filtering window is mainly composed of a transmission lens and a light-blocking grid.

[0018] Furthermore, LED near-infrared light sources are used to emit near-infrared light in the 880–910 nm wavelength range.

[0019] Furthermore, the digital micromirror consists of hundreds of thousands of tiny mirrors, each of which can be rotated ±12°.

[0020] The present invention also provides an identification method based on the above-mentioned active near-infrared photoelectric feature identification device, comprising:

[0021] LED near-infrared light source emits near-infrared light, which is then redirected by an infrared light guide filter module and a reflector, and then amplified by an infrared double convex lens before being uniformly projected onto a digital micromirror.

[0022] The communication module receives the encoded image transmitted from the outside and downloads it to the storage module; the communication module receives the control command, and the control module controls the flipping of the micromirror according to the stored QR code image sequence to realize optical dynamic encoding;

[0023] The encoded light is amplified by the short-range optical magnification module and finally projected onto the filter window for easy identification by infrared observation equipment.

[0024] Furthermore, the encoded graphics can also be downloaded offline to the storage module using a downloader in advance.

[0025] Compared with the prior art, the significant advantages of this invention are: the active near-infrared photoelectric feature identification device adopts optimized optical design and digital micromirror technology to achieve high-precision dynamic encoding of a single infrared light source, realizing clear, dynamic and stable display of infrared features. It has the characteristics of all-weather propagation, long-distance identification and high dynamic response, and has the advantages of large information capacity, low power consumption, high stability and low manufacturing cost. Attached Figure Description

[0026] Figure 1 This is a system structure diagram of the active near-infrared photoelectric feature identification device.

[0027] Figure 2 This is a flowchart of the light source transmission process.

[0028] Explanation of reference numerals in the attached diagram: 1 is an LED near-infrared light source; 2 is an infrared light guide and filter module; 3 is a reflector; 4 is an infrared biconvex lens; 5 is a digital micromirror module; 6 is a connecting cable; 7 is a control system; 8 is a short-distance optical magnification module; 9 is a filter window. Detailed Implementation

[0029] This invention proposes an active near-infrared photoelectric feature marking device, comprising a frequency-converting infrared light source, an infrared light-guiding filter module, a reflector, an infrared biconvex lens, a digital micromirror module, a control system, a short-distance optical magnification module, and a filter window;

[0030] LED near-infrared light source can emit near-infrared light in the 880-910nm band, and the light source shines onto the infrared light guide filter module;

[0031] The infrared light guide and filter module has the functions of guiding light, preventing infrared light from scattering, and filtering infrared light in other frequency bands.

[0032] Near-infrared light is reflected by a mirror to change its direction, with the aim of optimizing the optical path structure and device layout;

[0033] The light is magnified by an infrared biconvex lens and projected evenly onto the digital micromirror.

[0034] Digital micromirrors consist of hundreds of thousands of tiny mirrors, each of which can be rotated ±12°, so each micromirror has the ability to independently control the switching of light.

[0035] The control system includes a control module, a storage module, and a communication module;

[0036] The control module uses a programmable gate array (FPGA) chip as the main control core to control the timing and operation logic of each module of the system, and acts as a digital optical processor to control the flipping of each micromirror.

[0037] The storage module stores a sequence of QR code images composed of 0s and 1s; if the QR code image is white, a micromirror at the corresponding position needs to be controlled at a positive 12 degrees, and if it is black, a micromirror needs to be controlled at a negative 12 degrees.

[0038] The communication module can receive dynamic encoded graphics and control signals sent by a remote server in real time, realizing dynamic interactive photoelectric feature identification;

[0039] The control system controls the flipping of each mirror in the digital micromirror according to the target QR code graphic sequence, so as to achieve high-precision and low-distortion dynamic encoding of incident light.

[0040] After being encoded by the digital micromirror, the light is magnified by the short-distance optical magnification module and projected onto the filter window;

[0041] The short-range optical magnification module enables short-range high-magnification magnification of digital micromirror projection, meeting the long-distance identification requirements of infrared observation equipment;

[0042] The filter window consists of a transmission lens and a light-blocking grid, which has the functions of filtering clutter and blocking external interference light, making it easy for infrared observation equipment to identify.

[0043] The grid structure of QR code graphic sequences and filtering windows can be customized according to the feature recognition protocol, communication information volume and the performance of external observation equipment to achieve diversity and security of infrared photoelectric feature identification.

[0044] The present invention will now be described in further detail with reference to the accompanying drawings.

[0045] Example

[0046] Combination Figure 1 An active near-infrared photoelectric feature identification device includes an LED near-infrared light source 1, an infrared light guide filter module 2, an infrared biconvex lens 4, a reflector 3, a digital micromirror module 5, a control system 7, a short-distance optical magnification module 8, and a filter window 9.

[0047] The LED near-infrared light source 1 is a small-sized frequency-conversion low-power infrared light source;

[0048] The infrared light guide and filter module 2 has the functions of guiding light, preventing infrared light from scattering, and filtering infrared light of other frequency bands.

[0049] The reflector 3 is used to change the direction of light, with the aim of optimizing the optical path structure and device layout;

[0050] The infrared biconvex lens 4 is used to amplify infrared light and project it evenly onto the digital micromirror;

[0051] The digital micromirror module is a chip-level microelectromechanical system;

[0052] The control system 7 is responsible for controlling the flipping of each micromirror in the digital micromirror module to achieve high-precision dynamic encoding of the incident light; the control system 7 is connected to the digital micromirror module 5 through the connecting cable 6.

[0053] Furthermore, the control system includes a control module, a storage module, and a communication module; the control module uses a programmable gate array (FPGA) chip as the main control core; the storage module stores a sequence of QR code graphics composed of 0s and 1s; the communication module can receive dynamic encoded graphics and control signals sent by a remote server in real time to realize dynamic interactive photoelectric feature identification.

[0054] The short-range optical magnification module enables short-range high-magnification magnification of digital micromirror projection, meeting the long-distance identification requirements of infrared observation equipment.

[0055] The filtering window consists of a transmission lens and a light-blocking grid, which has the functions of filtering clutter and blocking external interference light, making it easy for infrared observation equipment to identify. The light-blocking grid is attached to the top of the projection lens, which is equivalent to a mesh-like light-blocking film, allowing light to be emitted in a matrix form. The specific number of grids in the x and y directions is customized according to the complexity of the features.

[0056] Furthermore, based on the feature recognition protocol, the amount of communication information, and the performance of external observation equipment, the grid structure of the QR code graphic sequence and the filtering window can be customized to achieve both richness and security of near-infrared photoelectric feature identification.

[0057] The device operates as follows: LED near-infrared light source 1 emits near-infrared light. This light is redirected by an infrared light-guiding filter module and a reflector, then amplified by an infrared biconvex lens and uniformly projected onto a digital micromirror. The communication module receives externally transmitted coded patterns and downloads them to the storage module; alternatively, they can be pre-downloaded offline using a downloader. Upon receiving control commands, the control module controls the micromirror's rotation based on the stored QR code pattern sequence, achieving dynamic optical encoding. The encoded light is amplified by a short-range optical magnification module and finally projected onto a filtered window for easy identification by infrared observation equipment.

Claims

1. An active near-infrared photoelectric feature identification device, characterized in that, It includes an LED near-infrared light source (1), an infrared light guide and filter module (2), a reflector (3), an infrared biconvex lens (4), a digital micromirror module (5), a control system (7), a short-distance optical magnification module (8), and a filter window (9); The LED near-infrared light source (1) emits near-infrared light, which is directed to the infrared light guide filter module (2). The infrared light guide and filter module (2) has the functions of guiding light, preventing infrared light from scattering and filtering infrared light of other frequency bands; Near-infrared light is reflected by a reflector (3), changing the direction of the light. The light is magnified by the infrared biconvex lens (4) and projected evenly onto the digital micromirror; The digital micromirror consists of multiple small mirrors, each of which can be flipped to a set angle; The control system controls the flipping of each mirror in the digital micromirror according to the target QR code graphic sequence, thereby realizing dynamic encoding of the incident light; After being encoded by the digital micromirror, the light is magnified and projected onto the filter window (9) by the short-distance optical magnification module (8).

2. The active near-infrared photoelectric feature identification device according to claim 1, characterized in that, The control system includes a control module, a storage module, and a communication module; The control module uses a programmable gate array chip as the main control core to control the timing and operation logic of each module in the system, and acts as a digital optical processor to control the flipping of each micromirror. The storage module stores a sequence of QR code images consisting of 0s and 1s; The communication module is used to receive dynamic encoded graphics and control signals sent by a remote server in real time, so as to realize dynamic interactive photoelectric feature identification.

3. The active near-infrared photoelectric feature identification device according to claim 1, characterized in that, The filter window (9) is mainly composed of a transmission lens and a light-blocking grid.

4. The active near-infrared photoelectric feature identification device according to claim 1, characterized in that, LED near-infrared light sources are used to emit near-infrared light in the 880–910 nm wavelength range.

5. The active near-infrared photoelectric feature identification device according to claim 1, characterized in that, Digital micromirrors consist of hundreds of thousands of tiny mirrors.

6. The active near-infrared photoelectric feature identification device according to claim 1, characterized in that, Each mirror can be rotated ±12°.

7. A recognition method based on the active near-infrared photoelectric feature identification device according to claim 1 or 2, characterized in that, include: LED near-infrared light source emits near-infrared light, which is then redirected by an infrared light guide filter module and a reflector, and then amplified by an infrared double convex lens before being uniformly projected onto a digital micromirror. The communication module receives the encoded image transmitted from the outside and downloads it to the storage module; the communication module receives the control command, and the control module controls the flipping of the micromirror according to the stored QR code image sequence to realize optical dynamic encoding; The encoded light is amplified by the short-range optical magnification module and finally projected onto the filter window for easy identification by infrared observation equipment.

8. The method according to claim 7, characterized in that, The encoded graphics are downloaded offline to the storage module in advance using a downloader.

9. The method according to claim 7, characterized in that, LED near-infrared light sources are used to emit near-infrared light in the 880–910 nm wavelength range.

10. The method according to claim 7, characterized in that, Digital micromirrors consist of hundreds of thousands of tiny mirrors, each of which can be rotated ±12°.

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