472 results about "Long wave infrared" patented technology

Vehicle computing systems may receive and fuse long-wave infrared data with radar data to detect and track objects in low-visibility driving environments. In some examples, radar data including position and velocity data may be projected over infrared image data to detect, classify, and track infrared-emitting objects. Machine-learned transformer models with attention also may be trained to output object detections based on combined infrared and radar data. The fusion of infrared and radar data may be used individual and / or may be synchronized with other sensor modalities. In some examples, the fusion and analysis of infrared and radar data may be used in specific low-visibility driving environments, using low-light, fog, and shadowed areas of the environment, to detect and track infrared-emitting and / or moving objects such as pedestrians and animals that may be obscured from detection by other sensor modalities.

The invention relates to the technical field of photovoltaic module detection, in particular to a hot spot detection system and method for a photovoltaic module. Comprises: a multispectral imaging module configured to synchronously collect image data of a photovoltaic module in a visible light band, a near-infrared band and a long-wave infrared band; the electroluminescence analysis module is in signal connection with the multispectral imaging module and is used for acquiring carrier recombination radiation data of the photovoltaic module in a reverse bias state; the dynamic threshold value processing module is configured to establish a dynamic correlation model of the environment parameters and the hot spot characteristic parameters; the three-dimensional reconstruction module is configured to perform spatial registration on the multispectral imaging data and the electroluminescence data and construct three-dimensional temperature field distribution of the photovoltaic module; the defect positioning module is configured to determine the accurate position of a hot spot according to temperature field distribution and carrier recombination characteristics; according to the scheme, a novel detection system architecture with multi-mode collaboration, high dynamic adaptability and three-dimensional analysis capability is constructed.

The invention discloses a distributed polarization detection system and method based on position regulation and control target reconstruction, and belongs to the field of distributed polarization cooperative detection and photoelectronic imaging. The distributed polarization detection system comprises a lighting device, a multi-parameter auxiliary detection objective table and a long-wave infrared polarization detection device; the long-wave infrared polarization detection device is provided with three sub-polarization detection devices, the method is implemented based on a distributed polarization detection system, and polarization information in three different directions can be collected at the same time through the distributed polarization detection system based on position regulation and control target reconstruction. The identification capability of the disguised / similar target at a single angle is improved; and errors caused by time delay are avoided. Polarization information obtained by reasonably distributing detection positions is mutually supplemented, polarization images are mutually fused, target signals are effectively extracted from scattered light to analyze the polarization characteristic difference between interference light and target reflected light, and the resolution, contrast and detection distance of polarization imaging can be improved.

The invention discloses a high-detection-efficiency long-wave infrared spectrum imaging device and an imaging method, and belongs to the field of micro-nano optical design, the scheme is as follows: a metasurface spectrum modulation layer is composed of a square matrix formed by arranging a plurality of metasurface periodic units in sequence, and each metasurface periodic unit is composed of a plurality of metasurface structure units; each metasurface structure unit comprises a substrate and a plurality of nano columns, and the plurality of nano columns are distributed on the substrate in a C4 symmetrical structure; reverse design of the high-transmittance metasurface structure units is achieved through a particle swarm optimization algorithm, and structure parameters of the high-transmittance metasurface structure units are obtained; incident light passes through the metasurface spectrum modulation layer to realize spectrum coding, coding information is converted into an electric signal by a long-wave infrared focal plane detection pixel below, and a high-resolution long-wave infrared spectrum image can be reconstructed in cooperation with a deep neural network algorithm. The spectral imaging method provided by the invention is perfectly compatible with semiconductor and MEMS technologies, and long-wave infrared band spectral imaging with high detection efficiency is realized.

The invention belongs to the technical field of camouflage materials, and particularly relates to a natural vegetation imitating visible light-laser-infrared compatible camouflage film. Comprising a substrate, a thermal infrared dual-band camouflage and near infrared spectrum regulation and control layer and a visible light-laser-near infrared regulation and control layer which are arranged in sequence. The upper-layer natural vegetation imitating structure is mainly used for simulating spectral characteristics of natural vegetation, and meanwhile, the extremely low reflectivity at the position of 1.06 mu m near-infrared laser wavelength is achieved by controlling the thickness of a film layer; the thermal infrared camouflage structure in the middle realizes low emissivity of medium-wave infrared and long-wave infrared; the substrate provides a bearing function. The multilayer film not only can realize refined simulation of a reflection spectrum of natural vegetation in a visible light-near infrared wavelength range, but also has the functions of adjusting different visible light spectrum colors and resisting an infrared detector and a 1.06 [mu] m laser detector; and a visible light-laser-infrared multi-band compatible camouflage performance covering a wide wavelength range of 0.4-14 microns can be realized.

The invention discloses an unmanned aerial vehicle multi-scale crop detection method based on a neurodynamics model, and belongs to the technical field of crop detection, and the method comprises the steps: obtaining a visible light image, a long-wave infrared image and hyperspectral data of a crop under the multi-scale condition of an unmanned aerial vehicle; performing registration fusion processing on the visible light image, the long-wave infrared image and the hyperspectral data to obtain fused hyperspectral cube data; constructing a neurodynamic model for crop detection, inputting the fused hyperspectral cube data into the neurodynamic model for crop detection for training, and outputting a crop detection result; and calculating a loss function of the neurodynamic model for crop detection based on a crop detection result, and feeding back the loss function to the model for constraint. According to the invention, visual processing, deep learning and agricultural scene perception technologies are combined, and efficient and accurate crop monitoring is realized by using the parallel computing capability and anti-interference characteristics of the neurodynamics model.

The invention relates to a three-waveband medium-long wave infrared optical filter and a preparation method, the three-waveband medium-long wave infrared optical filter comprises a front film system, a substrate and a back film system, and the substrate is located between the front film system and the back film system; the front film system is formed by alternately overlapping germanium layers and zinc selenide film layers; and the back film system is formed by alternately overlapping germanium layers and zinc selenide film layers. According to the invention, the light energy of three wave bands of 3780-4000 nm, 4500-4900 nm and 7850-9500 nm is improved, the luminous flux of other wave bands is well inhibited, the technical problem of infrared filtering windows in some special infrared spectrum detection systems is solved, and a new scheme is provided for the application of the infrared spectrum detection systems.

The invention discloses a transmission-type ultra-wideband multi-focal-plane optical system which comprises a first positive lens, a first negative lens, a second positive lens, a second negative lens and a third negative lens which are sequentially arranged along the same optical axis. Incident light of different wave bands sequentially passes through the first positive lens, the first negative lens, the second positive lens, the second negative lens and the third negative lens, differential focusing is formed by setting different back intercept, and a visible light wave band, a near-infrared wave band, a medium-wave infrared wave band and a long-wave infrared wave band respectively form independent focal planes which are axially separated. The transmission wave band of the optical system is 0.5-12 microns, visible light, near-infrared light, medium-wave infrared light and long-wave infrared light are covered, the common optical element and axial separation multi-focal plane design is adopted, different wave bands share the same set of optical elements, and the target can be detected only by placing the target on the corresponding focal plane. And optical collimation of different wavebands can be realized by changing the position of the focal plane.

The invention provides a dual-wavelength tunable all-solid-state mid-far infrared laser, relates to the technical field of lasers, and is used for solving the technical problems that high-performance dual-wavelength 3 [mu] m waveband laser and mid-far infrared waveband laser generated by pumping of the high-performance dual-wavelength 3 [mu] m waveband laser are difficult to obtain in the prior art. The middle and far infrared laser comprises an erbium-doped laser and an optical parametric oscillator, the erbium-doped laser is used for providing dual-wavelength 3-micron wave band pulse laser, and the erbium-doped laser comprises a pumping source, an erbium-doped laser medium, a gain modulator, a high reflective mirror and an output mirror; the optical parametric oscillator is used for obtaining medium-wave infrared laser and long-wave infrared laser which are output in a dual-wavelength mode under the pumping effect of the dual-wavelength pulse laser in the 3-micron wave band. The mid-far infrared laser is simple in structure and convenient to use, can obtain tunable dual-wavelength mid-far infrared pulse laser with high beam quality, and meets the light source requirements of differential absorption of toxic gas telemetering of laser radar and photoelectric countermeasure.

The invention provides a long-exit-pupil-distance broadband common-aperture composite simulation optical system, and belongs to the technical field of target scene composite analog simulation. A broadband objective lens group A, a space beam combiner group B and a long-wave infrared projection lens group D are sequentially arranged in the optical system from left to right along light, a visible light projection lens group C is located on the upper side of the space beam combiner group B, and a long-wave infrared projection lens group C is located on the lower side of the space beam combiner group B; a visible light image plane is positioned on the right side of the visible light projection lens group C; the medium-wave infrared projection lens group E is located on the lower side of the space beam combiner lens group B, the medium-wave infrared image surface is located on the lower side of the medium-wave infrared projection lens group E, the long-wave infrared image surface is located on the right side of the medium-wave infrared image surface, and the exit pupil position is located on the left side of the broadband objective lens group A; the problem that a single-channel target modulo system only adapts to simulation of imaging guidance equipment of a specific wave band and is not suitable for semi-physical simulation tests of three-mode composite imaging guidance equipment and two-mode composite imaging guidance equipment is solved.

The invention discloses a geometric phase-based long-wave infrared arsenic selenide superlens and a design method thereof, the superlens is composed of a substrate and an optical metasurface arranged on the substrate, and the optical metasurface is composed of a plurality of elliptic cylinders which rotate by an angle alpha and are arranged periodically. The method comprises the following steps: determining structural parameters of a microstructure unit; rotating the microstructure units by an angle alpha; according to the relation between the geometric phase and the alpha angle; adjusting the rotation angle alpha of the microstructure unit to enable the angle alpha to meet the geometric phase distribution of the microstructure unit, and determining the angle alpha of the microstructure unit; and forming a metasurface array according to the alpha angles of the microstructure units and preset periodic arrangement, and arranging the metasurface array on the upper surface of the substrate to obtain the super lens. According to the invention, high-efficiency and high-resolution imaging can be realized under long-wave infrared. The long-wave infrared arsenic selenide super lens based on the geometric phase and the design method thereof can be widely applied to the technical field of super lens design.

The invention belongs to the technical field of camouflage materials, and particularly relates to a thermal infrared low-radiation imitation green leaf multilayer film and a preparation method thereof. Comprising a substrate, a long-wave infrared regulation and control layer, a medium-wave infrared regulation and control layer and a green-leaf-imitating hyperspectral regulation and control layer which are arranged in sequence, the long-wave infrared regulation and control layer is stacked on the substrate according to a periodic structure of MHML, the medium-wave infrared regulation and control layer is stacked on the long-wave infrared regulation and control layer according to a periodic structure of (HM) 2L, and the green-leaf-imitating hyperspectral regulation and control layer is stacked on the medium-wave infrared regulation and control layer according to a periodic structure of (LM) 3 (HM) 3 (HL) (HM); h is a high-refractive-index material, M is a medium-refractive-index material, and L is a low-refractive-index material. Aiming at the problems of poor compatibility, large radar wave transmission influence, strict multi-layer film thickness control requirements and the like in the prior art, by optimizing the film system structure, the green-leaf-imitating hyperspectral camouflage characteristic is realized in the visible light-near infrared band, and the low-radiation performance is realized in the thermal infrared dual-band.

The invention relates to a miniaturized medium-long wave infrared solid-state laser in which a thulium-doped laser directly pumps a ZGP crystal, the thulium-doped laser takes two laser diodes with the central emission wavelength of 793 nm as pumping sources, two Tm: YAP crystals with the same parameters are cascaded and placed in a U-shaped resonant cavity to serve as laser gain media, and an acousto-optic Q crystal controls intra-cavity loss in the resonant cavity, so that the thulium-doped laser directly pumps the ZGP crystal. Pulse laser with the wavelength of 1.94 m is output; the 1.94 m pulse thulium laser serves as pump light and passes through the ZGP-OPO module, and 2.8 m signal light and 6.2 m idler frequency light are obtained. The Tm laser outputs 1.94 m laser through primary oscillation to directly serve as a pump source, the ZGP-OPO outputs medium-long wave infrared laser in a nonlinear mode, the overall light path structure of the medium-long wave laser is simplified, and the electro-optical conversion efficiency is improved.

The invention relates to the technical field of gas detection, and discloses a high-sensitivity sulfur hexafluoride detection method and a high-sensitivity sulfur hexafluoride detection system based on cooperation of a long-wave infrared absorption spectrum and a thermal infrared spectrum, which are used for solving the problem that water vapor in a detection area affects a sulfur hexafluoride detection result during sulfur hexafluoride detection. The method comprises the following steps: acquiring long-wave infrared absorption spectrum data and environment abnormal data, acquiring an infrared radiation space distribution diagram of a to-be-detected area, acquiring environment humidity and dew point temperature, obtaining initial detection concentration of sulfur hexafluoride according to the long-wave infrared absorption spectrum data, and calculating the concentration of sulfur hexafluoride according to the environment abnormal data, the environment humidity and the dew point temperature. The method comprises the following steps: acquiring an environmental water vapor influence index through evaluation, performing water vapor interference judgment, and if judging that water vapor interference exists in a current detection environment, correcting an initial detection concentration according to the environmental water vapor influence index to obtain an actual detection concentration, thereby effectively improving the accuracy of a sulfur hexafluoride detection result and reducing the problems of missing detection and false detection.

The invention discloses a preparation method of a double-wave infrared detector and a double-wave infrared section detector. The preparation method comprises the following steps: providing a GaSb substrate; sequentially growing a bottom contact layer, a medium wave absorption layer, a barrier layer, a long wave absorption layer and a top contact layer on the GaSb substrate; performing primary deposition of a passivation layer on the surface of the top contact layer, and performing primary etching from the absorption layer to the top contact layer; performing secondary deposition of a passivation layer in a covering manner, and performing secondary etching from the top contact layer to the bottom contact layer; depositing a passivation layer for the third time in a covering manner; holes are formed in the passivation layer of the table top and the passivation layer of the common electrode area, UBM metal TiPtAu is evaporated at the holes, and a detector chip is manufactured; the plasma exposure time of the surface of the absorption layer is reduced to the greatest extent; the detector chip and the In column of the reading circuit are interconnected to form the detector, and the prepared detector can obtain medium-wave infrared and long-wave infrared image information by using a single detector, and has excellent detection, identification and identification capabilities.

The invention provides an oblique incidence high-efficiency broadband long-wave light splitting film, the working angle of the light splitting film is 45 degrees, an equivalent relation of double-sided design and single-sided design under oblique incidence is established through numerical calculation, 45-degree single-sided transmittance and reflectivity target values are set, and film system matching is performed by adopting a design method of alternating three refractive indexes. And then the same film system is plated on the two surfaces of the long-wave infrared substrate respectively, so that the preparation of the beam splitting film is realized. The objective of the invention is to realize high-efficiency light splitting of a long-wave infrared window in a transmittance / reflectivity ratio of 1: 1 in a wave band range of 7 [mu] m-12 [mu] m under 45-degree inclined incidence, and the light splitting film has the advantages of stable performance and small surface shape change, and is suitable for optical systems for imaging, detection and the like.

The invention discloses a multilayer film compatible with H, K, medium-wave infrared and long-wave infrared band stealth and radiation heat dissipation. Comprising a substrate, a metal reflection layer, a photonic crystal layer fused with a loss medium and an H and K wave band antireflection layer, the absorption rate of H and K wave bands is larger than 0.5, the emissivity of medium wave infrared and long wave infrared bands is lower than 0.5, and the emissivity of very long wave infrared bands is larger than 0.5; the photonic crystal layer fused with the loss medium is of a multi-layer structure and is formed by alternately stacking dielectric layers made of various high-refractive-index dielectric materials and dielectric layers made of various low-refractive-index dielectric materials. The multilayer film provided by the invention has effective radiation heat dissipation and heat management capabilities while realizing stealth on solar radiation and heat radiation, and can be widely applied to the fields of aviation, aerospace and the like.

The invention discloses a device for realizing low-loss work of a long-wave infrared femtosecond optical parametric oscillator, which belongs to the field of optical parametric oscillators and comprises a pumping source, a pumping focusing lens, a long-wave infrared nonlinear crystal cut at a Brewster angle, a laser medium dichroscope and an output coupling mirror. Wherein the nonlinear crystal meets the I-type phase matching condition for the optical parameter process, and the front and rear surfaces of the crystal cut the central wavelength of the oscillated signal pulse at a Brewster angle so as to reduce the loss of the pulse in the resonant cavity. According to the long-wave infrared femtosecond optical parametric oscillator, the limitation of residual loss of a crystal antireflection film is broken through by adopting Brewster angle cutting on the crystal, so that the construction of the femtosecond optical parametric oscillator based on the long-wave infrared nonlinear crystal becomes possible, and the bottleneck of the existing long-wave infrared femtosecond optical parametric oscillator in the aspects of wavelength tuning range, output power and the like is expected to be broken through; and a practical low-cost technical scheme is provided for construction and application of the long-wave infrared femtosecond optical parametric oscillator.

The invention relates to the technical field of structural safety detection of steel structural members, in particular to a steel structural damage identification and repair method, system and device and a medium, and the method comprises the steps: obtaining a multi-source image data set and a standard corrosion test block database of a steel structural member through an unmanned aerial vehicle, the multi-source image data set comprises a polarized visible light image, a long-wave infrared temperature matrix and hyperspectral reflectivity data, and the standard corrosion test block database comprises spectral feature vectors of different corrosion grades and corresponding physical parameters; and carrying out sub-pixel level registration and feature extraction on the multi-source image data set. According to the method, the unmanned aerial vehicle synchronously carries the three cameras to carry out real-time multi-dimensional data acquisition, the problem of data splitting in traditional single-mode detection is solved, the multi-spectral data acquisition efficiency and the sub-millimeter level hidden damage identification precision are remarkably improved, and dynamic environment interference is inhibited in real time through an intelligent parameter inversion mechanism.

The invention provides a design and manufacturing method of a medium-long wave infrared anti-reflection microstructure window, and relates to the technical field of infrared window processing and application. The method specifically comprises the following steps: performing simulation design on a medium-long wave infrared anti-reflection microstructure according to material characteristics and application requirements of a window substrate, and determining key dimension parameters to be processed; an outer surface anti-reflection microstructure and an inner surface anti-reflection microstructure are machined on the surfaces of the two sides of the window substrate respectively through multi-pulse femtosecond laser Bessel beams. The method has wide adaptability and flexibility, and efficient design and high-quality manufacturing of the anti-reflection microstructure on the surface of any window material can be achieved. The problem that an existing window material is low in medium-wave and long-wave infrared transmittance is solved, meanwhile, the window material has good structural durability and environmental adaptability, and the strict performance requirement of a common-caliber infrared dual-waveband imaging technology for an infrared window is met.

The invention relates to a dual-waveband medium-long wave infrared optical filter based on a germanium / zinc sulfide asymmetric film system and a preparation method of the dual-waveband medium-long wave infrared optical filter. The dual-waveband medium-long wave infrared optical filter comprises a front film system, a substrate and a back film system, the front film system and the back film system are formed by alternately overlapping germanium layers and zinc sulfide film layers; the average transmittance of the infrared optical filter in the wave band of 3800 nm to 4800 nm and the wave band of 8000 nm to 10000 nm is not lower than 91%. According to the two-waveband medium-long wave infrared optical filter disclosed by the invention, 3800 to 4800 nm amp is realized; according to the infrared filtering window, the light energy of medium waves and long waves of 8000-10000 nm is improved, the luminous flux of other wavebands is well inhibited, the technical problem of the infrared filtering window in some special infrared spectrum detection systems is solved, and a new scheme is provided for infrared application.

The invention discloses a common-caliber receiving long-wave infrared and GM-APD laser composite long-distance imaging device, and relates to the technical field of long-distance laser three-dimensional imaging. The method is used for solving the problem that an existing composite detection technology does not have the long-distance detection capacity in a near space or an outer space. The long-wave infrared and GM-APD laser radar composite detection mode is adopted, long-distance target array imaging not lower than 97 Km is achieved, and the imaging frame frequency can reach 10 Hz. The method specifically comprises the following steps of: improving a situation awareness action distance by adopting long-wave infrared imaging detection, and realizing accurate measurement and tracking of a target in a middle-short distance by adopting a GM-APD laser imaging detection technology; through long-wave infrared / GM-APD laser common-path fusion optical detection technology research, optical-mechanical system optimization layout, multi-dimensional information fusion perception and accurate identification measurement are realized. The method can be used in composite imaging fields such as long-distance target detection and identification, airborne topographic surveying and mapping, satellite-borne ground detection and the like.

The invention belongs to the technical field of infrared optics, and discloses a long-wave infrared continuous zooming microscope lens. The lens is provided with two lenses, namely a first lens and a second lens which are sequentially and coaxially arranged between an object plane and an image plane; the first lens is a meniscus positive lens of which the convex surface faces the image side, and the second lens is a meniscus positive lens of which the convex surface faces the image side; the first lens and the second lens can move between an object plane and an image plane so as to carry out high and low magnification switching. The long-wave infrared continuous zooming microscope lens can realize multi-magnification switching, and also has the characteristics of small number of lenses, large target surface and clear imaging; the working wave band is 8-12 [mu] m, the magnification factor is 0.2-0.6, the F number of the image space is 1.5, the number of pixels is 1280 * 1024, and the size of the pixels is 12 [mu] m.

The invention discloses an optical system which comprises a first lens, an optical filter and a second lens which are sequentially arranged in the optical path transmission direction, and further discloses a measuring device which comprises the optical system, the lower end of a detector cold shield is connected with a transition block, the lower end of the transition block is connected with a supporting column, the lower end of the supporting column is connected with a shell, and a Dewar flask is arranged on the shell. A detector is arranged on the end face, located in the detector cold screen, of the transition block. A turntable and a turntable base are sequentially connected below the shell; the imaging optical system is integrated into the structure of the vacuum cavity of the refrigeration type long-wave focal plane infrared detector, so that the refrigeration type long-wave focal plane infrared detector has a large-view-field imaging function, and the measuring device is portable and can meet the requirement for rapidly measuring atmospheric radiation spatial and temporal distribution.

The invention provides a high-power wide-spectrum long-wave infrared femtosecond laser generation method, and relates to the technical field of infrared ultrafast laser. According to the method, the 1.5 [mu] m pumping BGSe crystal is adopted, compared with a traditional 1 [mu] m pumping BGSe crystal, the heat accumulation effect is greatly reduced, and the operation stability of the system is remarkably improved in combination with a water-cooling heat dissipation device. Through crystal cutting angle optimization and phase matching design, 10-16 [mu] m wide-spectrum long-wave infrared femtosecond laser output is achieved, the power reaches 100 mW, and the application requirements in the fields of molecular spectrum recognition, environment monitoring and the like are met.

The invention discloses a two-piece long-wave infrared lens which comprises a first lens and a second lens which are sequentially arranged from an object plane to an image plane, the first lens and the second lens are both meniscus lenses which protrude towards the object side and have positive focal power, at least one of the object side face and the image side face of the first lens is a binary plane, and at least one of the object side face and the image side face of the second lens is a convex plane. The object side surface and the image side surface of the second lens are aspheric surfaces; and the proportional relation among the focal length, the maximum image height and the field angle is reasonably set. According to the lens, good imaging is ensured, the size and weight are reduced, the cost is reduced, the response rate is improved, and a large clear photographing range can be ensured when an object is remotely recognized.

The invention relates to a passive multiband sensing array system and a multi-target tracking method. The system comprises a multiband sensor group, an environment illumination sensor, a synchronization and control unit and a preprocessing unit, the multi-band sensor group comprises a visible light sensor, a near-infrared sensor and a long-wave infrared sensor which are integrated in a unified shell through a coaxial light path and do not comprise active emitters; the synchronization and control unit generates a synchronization signal and controls the multi-band sensor group and the environment illumination sensor to perform synchronous data acquisition; and the preprocessing unit receives the original image data, the environment illumination data and the synchronizing signal, outputs a structured multi-mode data packet and provides the structured multi-mode data packet to the multi-target tracking engine at the rear end, and the multi-target tracking engine outputs the tracking states of multiple targets. According to the invention, stable, continuous and high-precision tracking of a plurality of targets can be realized in a plurality of complex scenes, and the problems of poor environmental adaptability, dependence on active emission and insufficient robustness of the existing multi-target tracking scheme are effectively solved.

A hydrocarbon gas detection system including a longwave infrared camera, a spectral filter, and a computation unit. The spectral filter is disposed in the light path of the camera sensor. The spectral filter is made of a material selected from the group consisting of calcium fluoride, zinc sulfide, magnesium fluoride, and silicon. The computation unit is arranged to process image data of the longwave infrared camera for the hydrocarbon gas detection.

Vehicle computing systems may receive and fuse long-wave infrared data with radar data to detect and track objects in low-visibility driving environments. In some examples, radar data including position and velocity data may be projected over infrared image data to detect, classify, and track infrared-emitting objects. Machine-learned transformer models with attention also may be trained to output object detections based on combined infrared and radar data. The fusion of infrared and radar data may be used individual and / or may be synchronized with other sensor modalities. In some examples, the fusion and analysis of infrared and radar data may be used in specific low-visibility driving environments, using low-light, fog, and shadowed areas of the environment, to detect and track infrared-emitting and / or moving objects such as pedestrians and animals that may be obscured from detection by other sensor modalities.

The invention provides a rainfall monitoring method and system based on unmanned aerial vehicle multi-mode noise reduction in the technical field of environment monitoring and unmanned aerial vehicle application, and the method comprises the steps: S1, collecting a visible light image and a long-wave infrared image through a multispectral vision module after an unmanned aerial vehicle takes off, and collecting a rainfall audio from an acoustic cabin through a microphone; s2, carrying out noise reduction processing on the visible light image, the long-wave infrared image and the rainfall audio; s3, extracting a raindrop size distribution histogram and a spatial density thermodynamic diagram based on the visible light image and the long-wave infrared image, and extracting acoustic MFCC features based on rainfall audio; s4, performing feature fusion operation based on the raindrop size distribution histogram, the visual density thermodynamic diagram and the acoustic MFCC features to obtain rainfall intensity; and S5, carrying out cumulant dynamic compensation based on the rainfall intensity to obtain the cumulative rainfall. The rainfall monitoring method has the advantages that the precision, robustness and practical level of rainfall monitoring are greatly improved.