Galvanometer type laser fuze discrimination method and system for circular polarization rotation coding
The galvanometer-type laser fuze system, which utilizes the rotational and time coding of circularly polarized light, solves the problem of target discrimination in complex environments and achieves accurate discrimination with a high signal-to-noise ratio. It is suitable for environments with heavy fog and gunpowder smoke.
Patent Information
- Application Number
- CN202511558352.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-29
- Publication Date
- 2026-01-23
AI Technical Summary
Existing laser fuses struggle to achieve omnidirectional, high signal-to-noise ratio, and accurate target discrimination in complex battlefield environments, especially in foggy and smoke-filled environments, where it is difficult to distinguish targets from noise light, resulting in a high false alarm rate.
A galvanometer-type laser fuze system employing circular polarization direction coding generates and decodes left-handed and right-handed circularly polarized light signals through a laser, circular polarization encoder, micro-mirror module, beam splitter module, polarization filter module, and photodetector. Combined with time coding, it achieves strong signal marking and noise suppression.
It effectively solves the distance ambiguity problem in long-distance laser ranging, improves the signal-to-noise ratio, and enhances the ability to distinguish target reflection signals in foggy and smoky environments.
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Figure CN121383784A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of light detection, in particular, to a galvanometer type laser fuse discrimination method and system of circular polarization handedness coding. BACKGROUND
[0002] Laser proximity fuse is a photoelectric fuse that actively detects targets using laser beams. It irradiates targets with laser beams of specific amplitude, time domain and spatial characteristics through a transmitting optical system, receives target reflection echoes with a photoelectric receiving system, and processes them in real time to complete target recognition and detection. However, the complex real battlefield environment, such as heavy fog and battlefield smoke, seriously interferes with the discrimination between signal light and noise light, and laser detection has the problem of distance ambiguity. How to achieve omnidirectional, high signal-to-noise ratio and accurate fuse discrimination is a key technology.
[0003] Currently, the co-axial rotating multi-prism mirror is a common scheme for realizing the transmitting and receiving of laser fuses, and the micro-mirror is an effective way to realize multi-dimensional scanning of laser. There are studies on using the imaging advantage of polarization to realize laser fuse stray light suppression in complex environments. The existing technology only considers the depolarization effect in a single dimension. In actual scenarios, the material and roughness vary, and there is a situation where target and noise light depolarize together. In addition, using linearly polarized light can easily cause extinction at a specific angle, resulting in a sharp increase in false alarm rate. SUMMARY
[0004] In order to overcome at least one of the deficiencies in the prior art, the present application provides a galvanometer type laser fuse discrimination method and system of circular polarization handedness coding.
[0005] In a first aspect, a galvanometer type laser fuse discrimination system of circular polarization handedness coding is provided, comprising: a laser, a circular polarization encoder, a micro-mirror module, a light splitting module, a polarization filtering module, a photoelectric detector and a decoding discrimination module; the micro-mirror module comprises a MEMS galvanometer A, a rotation axis and a MEMS galvanometer B; the polarization filtering module comprises a left-handed circular polarization filter A and a right-handed circular polarization filter B; The laser emits light pulses; The light pulses enter the circular polarization encoder to generate circularly polarized pulses with changing handedness over time; The circularly polarized pulses are incident on the MEMS galvanometer A and reflected by high-frequency vibration to form a narrow-band fan-shaped light beam; the narrow-band fan-shaped light beam irradiates the target, and after being reflected by the target, a reflected pulse is formed; the reflected pulse is incident on the MEMS galvanometer B and reflected by high-frequency vibration to form a return light beam; The return light beam is incident on the light splitting module to uniformly split the light, forming two light signals with the same intensity; The two light signals with the same intensity enter the left circular polarization filter A and the right circular polarization filter B respectively to generate left circular polarization filtered light signals and right circular polarization filtered light signals; The left circular polarization filtered light signals and the right circular polarization filtered light signals enter the photodetector, and the photodetector collects the intensity distribution of each light signal over time; The decoding and discriminating module generates a time sequence encoding diagram corresponding to the left circular polarization filtering and a time sequence encoding diagram corresponding to the right circular polarization filtering according to the intensity distribution of the two light signals over time, and determines whether the reflection pulse of the target is derived from the left circular polarization input or the right circular polarization input according to the two time sequence encoding diagrams.
[0006] In one embodiment, the decoding and discriminating module generates a time sequence encoding diagram corresponding to the left circular polarization filtering and a time sequence encoding diagram corresponding to the right circular polarization filtering according to the intensity distribution of the two light signals over time, including: The intensity distribution of each light signal over time is time-divided according to a pulse period to generate a plurality of time intervals; For each time interval, the mean of the light signal intensity in the time interval is calculated or the maximum of the light signal intensity in the time interval is determined as a signal intensity comparison value; If the signal intensity comparison value is greater than the intensity threshold value of the interval, the encoding of the time interval is 1, otherwise, the encoding of the time interval is 0; The encodings of all time intervals constitute a time sequence encoding diagram.
[0007] In one embodiment, the determination of the intensity threshold value includes: The intensities of the two light signals in the time interval are superimposed to obtain a total intensity, and the intensity threshold value is equal to 1 / 2 of the total intensity.
[0008] In one embodiment, determining whether the reflection pulse of the target is derived from the left circular polarization input or the right circular polarization input according to the two time sequence encoding diagrams includes: If the time sequence encoding diagram corresponding to the right circular polarization filtering appears the encoding [0 0 1 1] and the time sequence encoding diagram corresponding to the left circular polarization filtering appears [1 0 0 1], the reflection pulse of the target is derived from the left circular polarization input; If the time sequence encoding diagram corresponding to the right circular polarization filtering appears the encoding [0 0 1 0] and the time sequence encoding diagram corresponding to the left circular polarization filtering appears [1 0 0 0], the reflection pulse of the target is derived from the right circular polarization input.
[0009] In one embodiment, the system further includes a synchronization control module for synchronously controlling the polarization state switching of the circular polarization encoder and the emission of the light pulse by the laser.
[0010] In one embodiment, the circular polarization encoder comprises a liquid crystal variable retarder synchronized with the pulse and a phase retarder, the liquid crystal variable retarder is controlled by voltage to generate positive and negative 45° linearly polarized light, the phase retarder generates circularly polarized pulses with time-varying handedness based on the positive and negative 45° linearly polarized light.
[0011] In a second aspect, a mirror type laser fuse discrimination method for circular polarization handedness coding is provided, comprising: emitting a light pulse; generating a circularly polarized pulse with time-varying handedness according to the light pulse; performing high-frequency vibration and reflection on the circularly polarized pulse to form a narrow-band fan-shaped light beam; the narrow-band fan-shaped light beam is irradiated onto a target, and forms a reflected pulse after being reflected by the target; performing high-frequency vibration and reflection on the reflected pulse to form a return light beam; performing uniform light splitting on the return light beam to form two light signals with the same intensity; performing left-handed circular polarization filtering and right-handed circular polarization filtering on the two light signals with the same intensity respectively to generate left-handed circular polarization filtered light signals and right-handed circular polarization filtered light signals; collecting the intensity distribution of each light signal over time; generating a time sequence encoding graph corresponding to left-handed circular polarization filtering and a time sequence encoding graph corresponding to right-handed circular polarization filtering according to the intensity distribution of the two light signals over time; and determining whether the reflected pulse of the target is derived from left-handed circular polarization input or right-handed circular polarization input according to the two time sequence encoding graphs.
[0012] In one embodiment, generating a time sequence encoding graph corresponding to left-handed circular polarization filtering and a time sequence encoding graph corresponding to right-handed circular polarization filtering according to the intensity distribution of the two light signals over time comprises: time-dividing the intensity distribution of each light signal over time according to a pulse period to generate a plurality of time intervals; for each time interval, calculating the mean value of the light signal intensity in the time interval or determining the maximum value of the light signal intensity in the time interval as a signal intensity comparison value; if the signal intensity comparison value is greater than the intensity threshold value of the interval, the encoding of the time interval is 1, otherwise, the encoding of the time interval is 0; the encodings of all time intervals constitute a time sequence encoding graph.
[0013] In one embodiment, the determination of the intensity threshold value comprises: superimposing the intensities of the two light signals in the time interval to obtain a total intensity; and the intensity threshold value is equal to 1 / 2 of the total intensity.
[0014] In one embodiment, determining whether the reflected pulse of the target is derived from left-handed circular polarization input or right-handed circular polarization input according to two time-encoding patterns comprises: If the time-encoding pattern corresponding to the right-handed circular polarization filter appears the code [0 0 1 1] and the time-encoding pattern corresponding to the left-handed circular polarization filter appears [1 0 0 1], the reflected pulse of the target is derived from left-handed circular polarization input. If the time-encoding pattern corresponding to the right-handed circular polarization filter appears the code [0 0 1 0] and the time-encoding pattern corresponding to the left-handed circular polarization filter appears [1 0 0 0], the reflected pulse of the target is derived from right-handed circular polarization input.
[0015] Compared with the prior art, the present application has the following beneficial effects: 1. The circular polarization and time double encoding is performed at the laser incidence end, the strong marking of the incident signal is realized, and the distance ambiguity problem in long-distance laser ranging can be effectively solved.
[0016] 2. The orthogonal rotary circular polarization decoding discrimination method is used at the exit end, the influence of the backscattering light can be suppressed, the signal-to-noise ratio of the system is further improved, and the discrimination of the target reflection signal in the smoke environment and the heavy fog special environment is especially suitable. BRIEF DESCRIPTION OF DRAWINGS
[0017] The present application can be better understood by referring to the description given below in conjunction with the accompanying drawings, which are incorporated in and form a part of the specification, and together with the detailed description, serve to explain the principles of the present application. In the drawings: Figure 1 A schematic diagram of a galvanometer type laser fuze discrimination system for circular polarization rotary direction encoding is shown; Figure 2 A principle schematic diagram of a circular polarization encoder for time encoding is shown; Figure 3 Intensity-time distribution curves of signal light and noise light after two rotary direction filters are shown, wherein (a) is an intensity-time distribution curve of signal light after left-handed circular polarization filter, (b) is an intensity-time distribution curve of signal light after right-handed circular polarization filter, (c) is an intensity-time distribution curve of noise light after left-handed circular polarization filter, and (d) is an intensity-time distribution curve of noise light after right-handed circular polarization filter; Figure 4 A time-encoding pattern for two-way optical signal discrimination is shown; Figure 5 A flow chart of a galvanometer type laser fuze discrimination method for circular polarization rotary direction encoding is shown. DETAILED DESCRIPTION
[0018] The exemplary embodiments of this application will be described hereinafter with reference to the accompanying drawings. For the purpose of clarity and a concise description, all the features of the practical embodiments are not described in the specification. It should be appreciated, however, that many embodiment-specific decisions can be made in the process of developing any such practical embodiments in order to achieve the specific objectives of the developers, and these decisions can vary from embodiment to embodiment.
[0019] It should also be noted here that, in order to avoid obscuring the present application with unnecessary details, only the device structures closely related to the scheme according to the present application are shown in the accompanying drawings, and other details not closely related to the present application are omitted.
[0020] It should be understood that the present application is not limited to the described embodiments only by virtue of the following description with reference to the accompanying drawings. In this context, the embodiments can be combined with each other, features can be replaced or borrowed between different embodiments, and one or more features can be omitted in one embodiment.
[0021] Laser is a special linearly polarized light, which can produce circularly polarized light through phase retarder. Circularly polarized light has better ability to maintain the direction of rotation than linearly polarized light when scattering with aerosol, fog, smoke and dust, and the polarization direction of rotation will be reversed when interacting with metal skin target. Laser panoramic fuze mainly reverses the distance information of the target based on the time of flight (TOF) method, but due to the influence of medium scattering, the signal and noise light can only be distinguished by time threshold. Combining the time dimension characteristics with the rotation direction characteristics of circular polarization can realize strong marking of incident signals, and can overcome the influence of strong backscattering light.
[0022] Figure 1 The schematic diagram of the galvanometer type laser fuze discrimination system with circular polarization rotation direction coding is shown, referring to Figure 1 The system includes a laser, a circular polarization encoder, a micro-mirror module, a light splitting module, a polarization filtering module, a photoelectric detector and a decoding discrimination module. The micro-mirror module includes MEMS galvanometer A, a rotating shaft and MEMS galvanometer B. The polarization filtering module includes left-handed circular polarization filter A and right-handed circular polarization filter B. The functions of each module are described in detail below.
[0023] The laser emits light pulses; The light pulses enter the circular polarization encoder to generate circularly polarized pulses with time-varying rotation direction; The circularly polarized pulse is incident to the MEMS mirror A to form a narrow-band fan-shaped light beam through high-frequency vibration and reflection; the narrow-band fan-shaped light beam is irradiated to the target to form a reflected pulse after being reflected by the target; the reflected pulse is incident to the MEMS mirror B to form a return light beam through high-frequency vibration and reflection; here, the rotating shaft located at the center drives the MEMS mirror to rotate coaxially at a high speed to form a two-dimensional circumferential return light beam of 360 degrees.
[0024] The return light beam is incident to the light splitting module to form two light signals of the same intensity through uniform light splitting; The two light signals of the same intensity enter the left-handed circular polarization filter A and the right-handed circular polarization filter B to generate left-handed circularly polarized filtered light signals and right-handed circularly polarized filtered light signals through circular polarization filtering. The left-handed circularly polarized filtered light signals and the right-handed circularly polarized filtered light signals enter the photodetector, and the photodetector collects the intensity distribution of each light signal over time; the photodetector includes a photodetector 1 (SPAD1) and a photodetector 2 (SPAD2) for detecting the left-handed circularly polarized filtered light signals and the right-handed circularly polarized filtered light signals, respectively.
[0025] The decoding and discrimination module generates a left-handed circular polarization filtering corresponding time sequence encoding diagram and a right-handed circular polarization filtering corresponding time sequence encoding diagram according to the intensity distribution of the two light signals over time; and determines whether the reflected pulse of the target is derived from left-handed circular polarization input or right-handed circular polarization input according to the two time sequence encoding diagrams.
[0026] Specifically, the laser is a pulse laser, the pulse width is less than 5ns, the wavelength is 1550nm, the repetition frequency is 1KHz, and the laser has low attenuation characteristics in a cloud scattering environment; The circular polarization encoder includes a liquid crystal variable retarder and a phase retarder synchronized with the pulse; the switching frequency of the voltage pulse of the liquid crystal variable retarder is consistent with the repetition frequency of the pulse laser, and both are 1KHz; the positive and negative 45° linearly polarized light can be switched at a high speed; then the phase retarder is further used to generate circularly polarized pulses with a periodic change in rotation direction based on the positive and negative 45° linearly polarized light, that is, left-handed circularly polarized pulses are emitted under odd pulses, and right-handed circularly polarized pulses are emitted under even pulses; The scanning angle of the MEMS mirror A and the MEMS mirror B is 5°, the single-axis vibration frequency is 1KHZ, and the rotating shaft rotating speed is 2000r / s, so that the scanning light beam can be circumferential and have a certain cone angle.
[0027] In a dense fog environment, the laser emits a 1.55um pulse width 3ns light beam, the target is a smooth metal mask, the detection distance is first fixed at 4m, and the polarization state of the liquid crystal variable retarder can be represented by the Stokes vector as follows:
[0028] wherein, are the four components of the Stokes vector.
[0029] Figure 2 The principle diagram of time encoding by circular polarization encoder is shown. After the circular polarization encoder, the Stokes vector of the exit light can be expressed as:
[0030]
[0031] wherein, is the Stokes vector at time t, is the Mueller scattering matrix of quarter-wave plate 1, is the Mueller scattering matrix of polarizer 1; is the Stokes vector at time t, is the pulse period, is the Mueller scattering matrix of quarter-wave plate 2, is the Mueller scattering matrix of polarizer 2. The handedness distribution of the pulse is shown in FIG. 1, which is left-handed circularly polarized light in odd-numbered pulses and right-handed circularly polarized light in even-numbered pulses. The further modulated laser is incident on a uniaxial (perpendicular to the rotation axis) MEMS micro-vibration mirror (vibration frequency 1 KH, scanning angle 5°), and through the high-frequency vibration of the wafer, the incident laser forms a fan-shaped scanning beam at the exit window under the fixed rotation axis angle.
[0032] In the process of high-speed vibration of the micro-vibration mirror, the rotation axis located in the center of the elastic body drives the coaxial high-speed rotation of the MEMS system, thereby forming an omnidirectional scanning beam of 360 degrees around the periphery of the elastic body. Figure 2 In the process of flight of the elastic body, the scanning beam, on the one hand, has Rayleigh and Mie scattering with smoke, aerosol particles, and micro-scale particles in the fog in the environment to form a certain backscattering light, the handedness of which is consistent with that of the corresponding incident light, i.e., the positive and negative of the V component are consistent.
[0033]
[0034]
[0035]
[0036]
[0037] wherein, is the Stokes vector of the scattered light, is the Mie scattering matrix of multiple scattering, is the of components.
[0038] Due to the handedness encoding of the incident light pulse, the circular polarization direction of the backscattered light and the circular polarization direction of the target reflected light are periodically changed. The reflected and scattered signal light and the target light enter the symmetric micro-mirror system on the other side of the central rotation axis through the incident window and are reflected, and are divided into two paths to enter the left-handed circular polarization filter and the right-handed circular polarization filter, respectively. Due to the difference in polarization characteristics, different timing intensity distributions are exhibited. Figure 3 The intensity distribution curves of the signal light and the noise light after being filtered by two kinds of handedness filters are shown, wherein (a) is the intensity distribution curve of the signal light after being filtered by the left-handed circular polarization filter, (b) is the intensity distribution curve of the signal light after being filtered by the right-handed circular polarization filter, (c) is the intensity distribution curve of the noise light after being filtered by the left-handed circular polarization filter, and (d) is the intensity distribution curve of the noise light after being filtered by the right-handed circular polarization filter. According to Figure 3 Taking 1 / 2 of the total intensity as the judgment threshold, according to the classification principle of Figure 2 the time is divided into four segments, and when the corresponding time interval has a strong light signal, it is recorded as 1, and when the light signal is weak, it is recorded as 0, so that the four time intervals will form different four-bit encodings.
[0039] Figure 4 The timing encoding diagram of the two-path light signal judgment is shown. When the distance of the detected target is not clear, the return signal received by the detector appears more than 2 times the pulse period, at which time there is a distance ambiguity problem, and there is no way to determine that the target signal comes from the first incident pulse. The following logic can be used: when the right-handed circular polarization filter appears the encoding [0 0 11] and the left-handed circular polarization filter appears [1 0 0 1] at the same time, it can be determined that the reflected pulse comes from the left-handed circular polarization input, that is, the circularly polarized pulse incident to the MEMS mirror A is a left-handed circularly polarized pulse; when the right-handed circular polarization filter appears the encoding [00 1 0] and the left-handed circular polarization filter appears [1 0 0 0] at the same time, it can be determined that the reflected pulse comes from the right-handed circular polarization input, that is, the circularly polarized pulse incident to the MEMS mirror A is a right-handed circularly polarized pulse; thus, the distance ambiguity problem in the judgment of the projectile-target encounter can be overcome, and the anti-scattering interference ability can be improved.
[0040] Based on the above principle analysis, in one embodiment, the decoding and discriminating module generates a left-handed circular polarization filter corresponding timing encoding diagram and a right-handed circular polarization filter corresponding timing encoding diagram according to the intensity distribution of the two-path light signal with time, including: First, the intensity distribution of each light signal with time is time- segmented according to the pulse period to generate a plurality of time intervals; Then, for each time interval, the mean value of the light signal intensity in the time interval is calculated or the maximum value of the light signal intensity in the time interval is determined as a signal intensity comparison value; Then, if the signal intensity comparison value is greater than the intensity threshold value of the interval, the encoding of the time interval is 1, otherwise, the encoding of the time interval is 0; Then, the encoding of all time intervals constitutes a time sequence encoding diagram.
[0041] Specifically, the determination of the intensity threshold value comprises: The intensities of the two light signals in the time interval are superimposed to obtain a total intensity, and the intensity threshold value is equal to 1 / 2 of the total intensity.
[0042] In one embodiment, determining, according to two time sequence encoding diagrams, whether the reflection pulse of the target is derived from left-handed circularly polarized input or right-handed circularly polarized input comprises: If the time sequence encoding diagram corresponding to the right-handed circularly polarized filtering appears the encoding [0 0 1 1] and the time sequence encoding diagram corresponding to the left-handed circularly polarized filtering appears [1 0 0 1], the reflection pulse of the target is derived from the left-handed circularly polarized input; If the time sequence encoding diagram corresponding to the right-handed circularly polarized filtering appears the encoding [0 0 1 0] and the time sequence encoding diagram corresponding to the left-handed circularly polarized filtering appears [1 0 0 0], the reflection pulse of the target is derived from the right-handed circularly polarized input.
[0043] Further, the system further comprises a synchronization control module for synchronously controlling the polarization state switching of the circular polarization encoder and the laser light pulse emission. Here, the synchronization control module can control the polarization state switching of the liquid crystal variable retarder of the circular polarization encoder.
[0044] The embodiment of the present application also provides a galvanometer type laser fuse discrimination method based on circular polarization handedness coding, Figure 5 The flow block diagram of the galvanometer type laser fuse discrimination method based on circular polarization handedness coding is shown, referring to Figure 5 The method mainly comprises: Step S1, emitting a light pulse; Step S2, generating a circularly polarized pulse with time-varying handedness according to the light pulse; Step S3, performing high-frequency vibration and reflection on the circularly polarized pulse to form a narrow-band fan-shaped light beam; the narrow-band fan-shaped light beam is irradiated onto a target to form a reflection pulse after being reflected by the target; high-frequency vibration and reflection are performed on the reflection pulse to form a return light beam; Step S4, uniformly splitting the return light beam to form two light signals with the same intensity; Step S5, left circular polarization filtering and right circular polarization filtering are respectively performed on the two light signals with the same intensity, to generate left circular polarization filtered light signals and right circular polarization filtered light signals; Step S6, the intensity distribution of each light signal with time is collected; Step S7, according to the intensity distribution of the two light signals with time, a time sequence encoding diagram corresponding to the left circular polarization filtering and a time sequence encoding diagram corresponding to the right circular polarization filtering are generated; according to the two time sequence encoding diagrams, it is determined whether the reflection pulse of the target is derived from the left circular polarization input or the right circular polarization input.
[0045] The specific implementation of the circular polarization rotation direction encoding galvanometer type laser fuse discrimination method of the embodiment can be seen in the embodiment part of the circular polarization rotation direction encoding galvanometer type laser fuse discrimination device in the foregoing, and the technical effects thereof correspond to the technical effects of the method, which will not be described here.
[0046] In summary, the present application has the following technical effects: 1. Double encoding of circular polarization and time is performed at the laser incident end, strong marking of the incident signal is realized, and the distance ambiguity problem in long-distance laser ranging can be effectively solved; 2. The orthogonal rotation direction circular polarization decoding discrimination method is used at the exit end, the influence of backscattering light can be suppressed, the signal-to-noise ratio of the system is further improved, and the method is especially suitable for discrimination of target reflection signals in smoke environment and heavy fog special environment.
[0047] The above is only various embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A galvanometer type laser fuze discrimination system of circular polarization handedness coding, characterized in that, The application relates to a laser, a circular polarization encoder, a micro-mirror module, a light splitting module, a polarization filter module, a photoelectric detector and a decoding discrimination module. The micro-mirror module comprises a MEMS mirror A, a rotating shaft and a MEMS mirror B; the polarization filter module comprises a left-handed circular polarization filter A and a right-handed circular polarization filter B. The laser emits light pulses. The light pulses enter the circular polarization encoder to generate circularly polarized pulses with changing rotation directions over time. The circularly polarized pulses are incident on the MEMS mirror A to form narrow-band fan-shaped light beams through high-frequency vibration and reflection; the narrow-band fan-shaped light beams irradiate on a target to form reflected pulses after being reflected by the target; the reflected pulses are incident on the MEMS mirror B to form echo light beams through high-frequency vibration and reflection. The echo light beams are incident on the light splitting module to form two light signals with the same intensity through uniform light splitting. The two light signals with the same intensity enter the left-handed circular polarization filter A and the right-handed circular polarization filter B to generate left-handed circularly polarized filtered light signals and right-handed circularly polarized filtered light signals. The left-handed circularly polarized filtered light signals and the right-handed circularly polarized filtered light signals enter the photoelectric detector, and the photoelectric detector collects the intensity distribution of each light signal over time. The decoding discrimination module generates a left-handed circular polarization filter corresponding time sequence encoding graph and a right-handed circular polarization filter corresponding time sequence encoding graph according to the intensity distribution of the two light signals over time; and determines whether the reflected pulses of the target are derived from left-handed circular polarization input or right-handed circular polarization input according to the two time sequence encoding graphs. The decoding discrimination module generates a left-handed circular polarization filter corresponding time sequence encoding graph and a right-handed circular polarization filter corresponding time sequence encoding graph according to the intensity distribution of the two light signals over time, which comprises:
2. The system of claim 1, wherein, The intensity distribution of each light signal over time is time-divided according to a pulse period to generate a plurality of time intervals; For each time interval, the mean value of the light signal intensity in the time interval or the maximum value of the light signal intensity in the time interval is calculated as a signal intensity comparison value; If the signal intensity comparison value is greater than the intensity threshold value of the interval, the encoding of the time interval is 1, otherwise, the encoding of the time interval is 0; The encodings of all time intervals constitute a time sequence encoding graph. The determination of the intensity threshold value comprises: The intensities of the two light signals in the time interval are superimposed to obtain a total intensity; and the intensity threshold value is equal to 1 / 2 of the total intensity.
3. The system of claim 2, wherein, According to the two time sequence encoding graphs, whether the reflected pulses of the target are derived from left-handed circular polarization input or right-handed circular polarization input, which comprises: If the right-handed circular polarization filter corresponding time sequence encoding graph appears the encoding [0 0 1 1] and the left-handed circular polarization filter corresponding time sequence encoding graph appears [1 0 0 1], the reflected pulses of the target are derived from left-handed circular polarization input; 4. The system of claim 1, wherein, If the right-handed circular polarization filter corresponding time sequence encoding graph appears the encoding [0 0 1 0] and the left-handed circular polarization filter corresponding time sequence encoding graph appears [1 0 0 0], the reflected pulses of the target are derived from right-handed circular polarization input. 5. The system of claim 1, wherein, The system further comprises a synchronization control module for synchronously controlling the polarization state switching of the circular polarization encoder and the laser emitting light pulses.
6. The system of claim 1, wherein, The circular polarization encoder comprises a pulse-synchronized liquid crystal variable retarder and a phase retarder, the liquid crystal variable retarder is controlled by voltage to generate positive and negative 45° linearly polarized light, and the phase retarder generates circularly polarized pulses with time-varying handedness based on the positive and negative 45° linearly polarized light.
7. A mirror type laser fuse discrimination method of circular polarization handedness coding, characterized in that, It comprises: emitting light pulses; generating circularly polarized pulses with time-varying handedness according to the light pulses; vibrating and reflecting the circularly polarized pulses at high frequency to form a narrow-band fan-shaped light beam; the narrow-band fan-shaped light beam irradiates on a target and forms a reflected pulse after being reflected by the target; vibrating and reflecting the reflected pulse at high frequency to form a return light beam; uniformly splitting the return light beam to form two light signals with the same intensity; respectively performing left-handed circular polarization filtering and right-handed circular polarization filtering on the two light signals with the same intensity to generate left-handed circular polarization filtered light signals and right-handed circular polarization filtered light signals; collecting the intensity distribution of each light signal over time; generating a left-handed circular polarization filtered time sequence encoding graph and a right-handed circular polarization filtered time sequence encoding graph according to the intensity distribution of the two light signals over time; and determining whether the reflected pulse of the target is derived from left-handed circular polarization input or right-handed circular polarization input according to the two time sequence encoding graphs.
8. The method of claim 7, wherein, Wherein, generating a left-handed circular polarization filtered time sequence encoding graph and a right-handed circular polarization filtered time sequence encoding graph according to the intensity distribution of the two light signals over time comprises: time segmenting the intensity distribution of each light signal over time according to the pulse period to generate multiple time intervals; for each time interval, calculating the mean of the light signal intensity within the time interval or determining the maximum of the light signal intensity within the time interval as a signal intensity comparison value; if the signal intensity comparison value is greater than the intensity threshold value of the interval, the encoding of the time interval is 1, otherwise, the encoding of the time interval is 0; the encodings of all time intervals constitute a time sequence encoding graph.
9. The method of claim 8, wherein, The determination of the intensity threshold value comprises: superimposing the intensities of the two light signals within the time interval to obtain a total intensity; and the intensity threshold value is equal to 1 / 2 of the total intensity.
10. The method of claim 7, wherein, Wherein, determining whether the reflected pulse of the target is derived from left-handed circular polarization input or right-handed circular polarization input according to the two time sequence encoding graphs comprises: if the right-handed circular polarization filtered time sequence encoding graph appears the encoding [0 0 1 1] and the left-handed circular polarization filtered time sequence encoding graph appears [1 0 0 1], the reflected pulse of the target is derived from left-handed circular polarization input; if the right-handed circular polarization filtered time sequence encoding graph appears the encoding [0 0 1 0] and the left-handed circular polarization filtered time sequence encoding graph appears [1 0 0 0], the reflected pulse of the target is derived from right-handed circular polarization input.