Spectrally modulated radiation thermometry device and method

Abstract

The application discloses a kind of spectral modulation radiation temperature measuring device and method, belongs to optical radiation temperature measuring technical field.For the problems, such as limited spectral channel, difficult to realize single-exposure multi-channel synchronous acquisition, temperature measuring stability and insufficient inversion robustness of existing radiation temperature measuring technology under long-distance, high dynamic and complex background conditions, the present application sets up wide-spectrum modulation optical window at the incident end, and combines wide-spectrum modulation multi-modal spectral chip, to synchronously acquire multi-channel wide-spectrum modulation radiation image under single exposure;Pretreatment is carried out using system on chip, and wide-spectrum modulation response model, emissivity spectral basis expansion model and time domain regularization are fused in temperature inversion calculation platform, to realize stable inversion of real temperature field, emissivity distribution and temperature rising sequence, suitable for non-contact temperature measurement in long-distance high-temperature target and other fields.

Description

Technical Field

[0001] This invention belongs to the field of optical radiation temperature measurement technology, specifically relating to a spectral modulation radiation temperature measurement device and a non-contact temperature measurement method based on radiation signals. Background Technology

[0002] In industrial high-temperature monitoring, propulsion system diagnostics, and material ablation testing, non-contact temperature measurement methods based on radiation are commonly used. These methods are based on the blackbody radiation law, estimating the temperature of a target surface by detecting its radiation energy spectrum in the visible to near-infrared bands and combining this with appropriate models. In the technical field of spectral composition measurement and high-temperature radiation determination, single-band or multi-band colorimetric methods are typically used for temperature inversion. However, under conditions of long distance, strong background interference, and high dynamic radiation, the accuracy of single-band or simple multispectral ratio temperature measurements is easily affected by saturation, background stray light, and changes in target emissivity, leading to insufficient reliability of the measurement results.

[0003] In existing technologies, multispectral radiation thermometry methods and devices have been applied to some extent. For example, patent CN113588115B discloses a temperature measurement method based on multispectral colorimetry. This method decomposes the radiation spectrum of an object onto different pixels of an imaging device using a dispersive system. After calibrating the wavelength distribution, it uses a blackbody furnace to generate voltage signals at different temperatures, calculates the voltage ratio between pairs of wavelengths, and selects the temperature value by minimizing the variance, forming a voltage ratio-temperature curve for temperature inversion. Although this method can improve the accuracy of temperature measurement, it mainly relies on colorimetric calculation and blackbody calibration, making it difficult to handle radiation acquisition from small targets at long distances. Furthermore, it has limited support for the joint solution of emissivity distribution and time series in dynamic scenarios, and is easily affected by complex environmental interference, which can impact imaging quality and radiation flux stability.

[0004] In addition, patent CN113237559B discloses a multispectral radiation temperature measurement device and its usage method. This device achieves beam splitting through a modulation disk and filters, uses a motor to control the rotation speed synchronized with an infrared thermal imager, cuts the target image to obtain beams of different wavelengths, converts them into a digital image sequence, and then reconstructs the true temperature field in an industrial control computer. This device is suitable for laser heating scenarios and can acquire brightness and temperature information of multiple wavelengths. However, it relies on a mechanically rotating modulation disk, which is easily affected by vibration or unstable rotation speed, affecting real-time performance. Moreover, its working distance is limited to 2 meters to 20 meters, making it difficult to adapt to temperature measurement of small targets at long distances. At the same time, its beam splitting method is time-series switching, requiring multi-frame image processing, and it cannot simultaneously acquire multi-channel data in a single exposure. The inversion process also does not fully integrate time series constraints.

[0005] As radiation thermometry applications expand to longer distances, smaller targets, higher dynamic ranges, and complex background conditions, existing multispectral radiation thermometry technologies are increasingly revealing their limitations in adaptability. On one hand, the number of effective spectral channels that can be used simultaneously is limited by the dynamic range of the optical system and detector, making it difficult to avoid saturation under high-temperature conditions while ensuring stable acquisition of weak radiation signals. On the other hand, some multispectral thermometry devices rely on mechanical switching or time-series scanning to achieve spectroscopic acquisition, making it difficult to achieve simultaneous acquisition of multiple channels in a single exposure. This can easily introduce time mismatch errors under conditions of rapid target changes or platform vibration. Furthermore, existing temperature inversion methods are mostly based on static spectral ratios or single-frame data modeling, failing to fully incorporate the spatial structural characteristics of the target and the constraints of radiation variations over time. Under the influence of noise, background stray light, and emissivity fluctuations, the inversion results are prone to instability or jumps. Simultaneously, the lack of a coordinated adjustment mechanism between the optical link, detection link, and control link makes it difficult to dynamically optimize imaging and temperature measurement parameters based on changes in observation distance, target size, and background brightness.

[0006] Within the technical framework of spectral composition measurement and radiation temperature inference, the aforementioned problems indicate that existing temperature measurement devices still struggle to simultaneously achieve measurement synchronization, system stability, and robustness in temperature inversion under conditions of long distance, wide temperature range, and strong background radiation. Therefore, a new temperature measurement technology is urgently needed that can achieve synchronous modulation and acquisition of multi-channel broadband radiation information under single-exposure conditions, integrate structural and temporal constraints during temperature inversion, and possess closed-loop adjustment capabilities for optical and detection parameters. This would improve the adaptability, stability, and reliability of radiation temperature measurement under complex operating conditions. Summary of the Invention

[0007] To address the limitations of existing spectral radiometric thermometry techniques under long-distance, high-dynamic, and complex background conditions, such as limited spectral channels, difficulty in achieving simultaneous multi-channel acquisition in a single exposure, insufficient stability and robustness of temperature measurement results, and weak system adjustment capabilities, this invention proposes the following solution:

[0008] A spectral modulation radiation thermometer, comprising:

[0009] A broadband modulation optical window, located at the incident end, is used to perform broadband modulation on the incident radiation from the target being measured.

[0010] A telephoto zoom lens is positioned behind the broadband modulation optical window and is used to image the broadband modulated radiation.

[0011] A broadband modulation multimodal spectral chip is disposed behind the telephoto zoom lens and is used to simultaneously acquire multi-channel broadband modulation radiometric images in a single exposure.

[0012] The system-on-a-chip is connected to the broadband modulation multimodal spectral chip and is used to perform preprocessing operations on the multichannel broadband modulation radiometric image;

[0013] The data interface component connects to the system-on-a-chip and is used for data interaction between the temperature inversion calculation platform and the temperature measuring device.

[0014] The temperature inversion calculation platform communicates with the on-chip system through a data interface component to obtain the true temperature field, emissivity distribution, and heating sequence of the target under test.

[0015] Furthermore, the device also includes:

[0016] The control unit is connected to the telephoto zoom lens and is used to control the focal length, focus position and aperture parameters of the telephoto zoom lens.

[0017] The housing has the broadband modulation optical window and data interface components mounted at both ends, while the telephoto zoom lens, broadband modulation multimodal spectral chip, on-chip system and control unit are mounted inside the housing.

[0018] Furthermore, the broadband modulation optical window employs a multilayer broadband modulation film system.

[0019] Furthermore, the broadband modulation multimodal spectral chip integrates multiple broadband modulation channels with different broadband transmittance weights on a single image plane according to a preset channel coding structure.

[0020] Furthermore, the data interface component includes a high-speed network port, a multi-core interface, and a serial port.

[0021] Furthermore, the telephoto zoom lens has a large aperture and long focal length, and is suitable for working distances from 1 to over 1000m.

[0022] Furthermore, the large light-transmitting aperture The long focal length .

[0023] Furthermore, the on-chip system preprocessing operations include shadow correction, color difference correction, and spectral image segmentation.

[0024] Furthermore, the temperature inversion calculation platform constructs an inversion framework based on a broadband modulation response model, an emissivity spectral basis expansion model, and time-domain regularization, and jointly solves for the real temperature field and emissivity distribution.

[0025] A method for spectral modulation radiation thermometry, the method being implemented based on the apparatus described in this invention, includes the following steps:

[0026] S1. Collect the incident radiation of the target under test, pass it through the broadband modulation optical window and the long focal length variable zoom lens in sequence, and form a multi-channel broadband modulation radiation image on the broadband modulation multimodal spectral chip.

[0027] S2. The on-chip system performs preprocessing and cross-channel spatial registration on the multi-channel broadband modulated radiometric image to obtain multi-channel radiometric data with a unified spatial reference.

[0028] S3. Input the multi-channel radiation data into the temperature inversion calculation platform, construct the inversion framework based on the broadband modulation response model, the emissivity spectrum basis expansion model and the time domain regularization, and jointly solve the real temperature field and emissivity distribution.

[0029] S4. Based on the joint solution results, structural image constraints and time series consistency constraints are further introduced to obtain the true temperature field, emissivity distribution and heating sequence of the target under test.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The temperature measuring device of this invention combines a broadband modulation optical window with a multilayer film structure, enabling the window itself to generate stable broadband modulation characteristics. This allows for channel differentiation capabilities that do not drift with the external environment under conditions of strong radiation and high dynamics. This characteristic is difficult to achieve with existing technologies that rely on external filters, as traditional structures are prone to channel inconsistency failure under vibration and temperature drift conditions.

[0032] The temperature measuring device described in this invention integrates a pixel-level broadband modulation channel encoding structure onto a spectral chip, enabling the simultaneous formation of multi-channel broadband responses in a single exposure. This avoids the optical axis offset and channel misalignment problems caused by multi-level beam splitting devices. This monolithic channel consistency is unattainable by existing technologies using mechanical beam splitting methods such as prisms and filter arrays.

[0033] The temperature measuring device described in this invention constructs a dual-modulation combination structure of "window broadband modulation characteristics + chip pixel-level modulation characteristics," enabling the transmission characteristics of both to form a coupled broadband modulation response during the imaging stage. This achieves a wide dynamic range, multi-channel, and high inversion stability acquisition effect. This combination overcomes the energy loss and response drift problems caused by excessively long optical paths and too many beam-splitting elements in existing technologies, providing performance that traditional multi-beam-splitting structures cannot simultaneously achieve.

[0034] The temperature measuring device described in this invention employs a combined variable-focus lens with a large aperture and long focal length, enabling it to maintain sufficient radiative flux and stable image quality even at long distances and under atmospheric turbulence, thus meeting temperature measurement requirements from 1 to 1000 meters. Traditional short-focal-length or small-aperture systems cannot simultaneously guarantee image quality and invertible flux in long-distance temperature measurement, making it difficult to meet engineering requirements for wide working distances.

[0035] The temperature measuring device described in this invention constructs a data interface component consisting of a "high-speed data path × optical control interface × actuator control interface," enabling parallel processing of command links, data streams, and optical actions, thereby supporting real-time transmission of large amounts of data in broadband images. Compared to existing devices with single interfaces or low-bandwidth structures, this combined structure avoids data blocking and channel delay misalignment, capabilities that traditional architectures cannot achieve.

[0036] The temperature measurement device described in this invention significantly improves the invertibility of broadband data by integrating a combined preprocessing mechanism of shadow correction, color difference correction, and cross-channel registration into the system-on-a-chip, ensuring that the output data has a unified benchmark and stable quality before entering the inversion stage. Existing technologies that rely on back-end processing struggle to eliminate instability caused by differences in spectral channels, especially in high frame rate scenarios where consistency cannot be guaranteed.

[0037] The method of this invention combines a multi-channel broadband modulated image formed by a single exposure, multi-dimensional correction processing of the on-chip system, and joint solution of the broadband modulation response model and the emissivity basis expansion model, enabling stable inversion of the temperature field, emissivity distribution, and heating sequence in dynamic scenarios. This process overcomes the limitations of traditional methods, such as reliance on a few bands, data noise amplification, and ill-conditioned equations, achieving broadband inversion stability and continuity that is difficult to achieve with existing colorimetric thermometry methods.

[0038] This invention features a compact structure, stable broadband modulation, strong multi-channel synchronous acquisition capability, and high reliability of temperature and emissivity inversion. It can acquire real temperature fields and spectral characteristics under long-distance, high-dynamic, and emissivity uncertainty conditions, and is suitable for fields such as thermal protection assessment of aerospace engines, monitoring of high-temperature material preparation processes, diagnosis of the operating status of energy equipment, and engineering testing of complex thermal fields. Attached Figure Description

[0039] Figure 1 This is a three-dimensional structural diagram of the temperature measuring device described in the embodiment;

[0040] Figure 2 This is a schematic diagram of the top structure of the temperature measuring device described in the embodiment;

[0041] Figure 3This is a physical illustration of the temperature measuring device described in the embodiment, showing the incident end.

[0042] Figure 4 This is a physical illustration of the temperature measuring device described in the implementation method, showing the outer shell structure.

[0043] Figure 5 This is a physical illustration of the temperature measuring device described in the implementation method, showing the data interface component.

[0044] Figure 6 This is a schematic diagram of the nine-channel response of the temperature measuring device described in the embodiment;

[0045] Figure 7 This is a flowchart of the multimodal radiation thermometry data processing method described in the implementation method;

[0046] Figure 8 This is a graph showing the temperature and emissivity inversion results of the temperature measurement method described in the implementation method. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Implementation Method 1

[0049] A spectral modulation radiation thermometer, comprising:

[0050] A broadband modulation optical window 5 is set at the incident end and is used to perform broadband modulation on the incident radiation from the target under test.

[0051] The telephoto zoom lens 2 is positioned behind the broadband modulation optical window 5 and is used to image the broadband modulated radiation.

[0052] A broadband modulation multimodal spectral chip 1 is disposed behind the telephoto zoom lens 2 and is used to simultaneously acquire multi-channel broadband modulation radiometric images in a single exposure.

[0053] The system-on-a-chip is connected to the broadband modulation multimodal spectral chip 1 and is used to perform preprocessing operations on the multichannel broadband modulation radiometric image;

[0054] The data interface component connects to the system-on-a-chip and is used for data interaction between the temperature inversion calculation platform and the temperature measuring device.

[0055] The temperature inversion calculation platform communicates with the on-chip system through a data interface component to obtain the true temperature field, emissivity distribution, and heating sequence of the target under test.

[0056] By organically combining a wide-spectrum modulation optical window, a long-focal-length variable-focus lens, a wide-spectrum modulation multimodal spectral chip, an on-chip system, data interface components, and a temperature inversion calculation platform, the radiation signal of the target under test can be captured at a long distance and multi-channel data can be processed simultaneously to obtain accurate temperature distribution and emissivity information. This makes the entire temperature measurement process more efficient and reliable, and is especially suitable for real-time monitoring in complex environments.

[0057] Furthermore, the device also includes:

[0058] The control unit 3 is connected to the telephoto zoom lens 2 and is used to control the focal length, focus position and aperture parameters of the telephoto zoom lens 2.

[0059] The housing 4 has the broadband modulation optical window 5 and data interface components installed at both ends of the housing 4, and the telephoto zoom lens 2, broadband modulation multimodal spectral chip 1, on-chip system and control unit 3 installed inside the housing 4.

[0060] The device utilizes a control unit to adjust the focal length, aperture, and position of the telephoto zoom lens. In addition, a housing securely encapsulates all components. This design makes the device more flexible and durable in actual operation, easily adapting to different distances and lighting conditions, while protecting internal components and preventing external interference from affecting temperature measurement accuracy.

[0061] Furthermore, the broadband modulation optical window 5 employs a multilayer broadband modulation film system.

[0062] Based on the multilayer broadband modulation film system, the window can perform fine broadband adjustment of the incident radiation, ensuring a uniform distribution of transmittance in different bands. As a result, the device performs more stably when dealing with various radiation sources, reduces signal distortion, and improves the overall imaging quality.

[0063] Furthermore, the broadband modulation multimodal spectral chip 1 integrates multiple broadband modulation channels with different broadband transmittance weights on a single image plane according to a preset channel coding structure.

[0064] By integrating multiple broadband modulation channels with different transmittance weights on a single image plane, this chip makes multimodal spectral acquisition more compact and efficient, capturing rich information in a single exposure and avoiding the multi-step operation of traditional methods. It can capture more complete radiation details, especially in dynamic scenes.

[0065] Furthermore, the data interface component includes a high-speed network port 6, a multi-core interface 7, and a serial port 8.

[0066] By combining high-speed network ports, multi-core interfaces, and serial ports, this data interface enables smoother and faster data transmission between devices and computing platforms, supports real-time interaction of large amounts of data, reduces latency issues, and better supports continuous monitoring and remote control in industrial applications.

[0067] Furthermore, the telephoto zoom lens 2 has a large aperture and long focal length, and is suitable for working distances from 1 to over 1000m.

[0068] With its large aperture and long focal length lens, it can maintain clear imaging and sufficient radiation collection at distances of 1 to 1000 meters or even further, making it particularly suitable for temperature measurement of small targets at long distances. This avoids the limitations of close-range operation and greatly expands the measurement range.

[0069] Furthermore, the large light-transmitting aperture The long focal length .

[0070] By defining a large aperture as a larger entrance pupil diameter and a long focal length as a longer effective focal length, this feature ensures that the device collects more light under low light or long distance conditions, while providing a narrow field of view and high magnification, helping users accurately lock onto targets in complex backgrounds and improving the accuracy and practicality of temperature measurement.

[0071] Furthermore, the on-chip system preprocessing operations include shadow correction, color difference correction, and spectral image segmentation.

[0072] By utilizing on-chip system-to-chip (STC) shadow correction, chromatic aberration correction, and spectral image segmentation, these preprocessing steps can quickly clean up image noise and biases, making subsequent data cleaner and more reliable, reducing the need for human intervention, and performing better in high-precision applications.

[0073] Furthermore, the temperature inversion calculation platform constructs an inversion framework based on a broadband modulation response model, an emissivity spectral basis expansion model, and time-domain regularization, and jointly solves for the real temperature field and emissivity distribution.

[0074] Based on the broadband modulation response model, the emissivity spectral basis expansion model, and the time-domain regularized inversion framework, the temperature inversion calculation platform can simultaneously solve for the temperature field and emissivity distribution, avoiding the error accumulation of a single model and making the results closer to the real situation. It provides more robust computational support, especially in variable temperature environments.

[0075] A method for spectral modulation radiation thermometry, the method being implemented based on the apparatus described in this invention, includes the following steps:

[0076] S1. The incident radiation of the target under test is collected and passed through the broadband modulation optical window 5 and the long focal length variable zoom lens 2 in sequence, and a multi-channel broadband modulation radiation image is formed on the broadband modulation multimodal spectral chip 1.

[0077] S2. The on-chip system performs preprocessing and cross-channel spatial registration on the multi-channel broadband modulated radiometric image to obtain multi-channel radiometric data with a unified spatial reference.

[0078] S3. Input the multi-channel radiation data into the temperature inversion calculation platform, construct the inversion framework based on the broadband modulation response model, the emissivity spectrum basis expansion model and the time domain regularization, and jointly solve the real temperature field and emissivity distribution.

[0079] S4. Based on the joint solution results, structural image constraints and time series consistency constraints are further introduced to obtain the true temperature field, emissivity distribution and heating sequence of the target under test.

[0080] By acquiring radiation signals, performing on-chip preprocessing, inputting multi-channel data, and solving for constraints, this method allows the entire temperature measurement process to be completed seamlessly from acquisition to output. It can simultaneously obtain the temperature field, emissivity, and heating sequence, and simplifies the operation and improves the depth of analysis, especially in tracking dynamic processes.

[0081] Implementation Method 2

[0082] This embodiment integrates the system structure, device composition, and inversion method described in the foregoing embodiments, and takes the measurement of long-distance high-temperature targets as a specific application scenario. Combined with the temperature measurement software running on an external computing platform, it explains the typical workflow of the temperature measurement device described in this invention, so as to further explain the collaborative operation mode and technical effect of the system under engineering conditions.

[0083] 1. Spectral Modulation Radiation Thermometry Device

[0084] The temperature measuring device used in this embodiment consists of multiple components, which form a collaborative working structure with optical links, data links, and control links. The overall structure of the device is as follows: Figures 1 to 2 As shown in the attached figure, the following components are labeled: 1. Wideband modulation multimodal spectral chip; 2. Long focal length variable zoom lens; 3. Control unit; 4. Housing; 5. Wideband modulation optical window; 6. High-speed network port; 7. Multi-core interface; and 8. Serial port.

[0085] Preferably, the physical object of this embodiment is as follows: Figures 3 to 5 As shown.

[0086] like Figure 6As shown, the broadband modulation multimodal spectral chip in this embodiment adopts a 3×3 pixel-level broadband modulation coding structure, which can integrate a 3×3 broadband modulation period on a single image plane to achieve synchronous broadband response acquisition of nine channels. It is the core detection device for acquiring spectral radiation information in a single exposure.

[0087] Preferably, the pixel-level broadband modulation coding structure can also integrate broadband modulation periods of 4×4 to 9×9 on a single image plane to achieve synchronous broadband response acquisition of more channels.

[0088] A broadband modulation optical window is set at the incident end of the optical path. The transmission ratio of different wavelengths is adjusted by a multilayer broadband modulation film system to enhance the channel separation in a wide temperature range and suppress saturation caused by high temperature radiation.

[0089] The telephoto zoom lens of this embodiment has a light-transmitting aperture of 125mm and a focal length range of 20.02 to 844.31mm, and can provide stable imaging within a working distance of 1 to 1000m, so as to ensure that small targets still have retrievable radiance under long-distance conditions.

[0090] The control unit is used to drive the telephoto zoom lens to perform zoom, focus and aperture adjustment, so that the device can adapt to imaging conditions formed by different target sizes, different background brightness and different working distances.

[0091] The system-on-chip (SOC) is integrated with a broadband modulation multimodal spectral chip for preprocessing such as shadow correction, color difference correction and spectral image segmentation, so that multi-channel images have uniform spatial coordinates and amplitude consistency.

[0092] This embodiment uses a 20-pin control interface, which together with a serial port and a high-speed network port forms a data interface component. The serial port is used to return status commands for the telephoto zoom lens, the high-speed network port is used to transmit nine-channel broadband modulated radiometric images, and the 20-pin control interface is used to drive the zoom, focus, and aperture actuators. This enables this embodiment to achieve optical adjustment closed loop and data interaction closed loop under long-distance and strong background conditions.

[0093] The temperature inversion calculation platform runs temperature measurement software based on QT+Python, which is used for equipment control, exposure management, loading of broadband modulation database, and joint solution of temperature and emissivity of broadband modulation response model. It can also display the temperature field, emissivity distribution and heating curve in real time on the display terminal.

[0094] 2. Spectral Modulation Radiation Thermometry Method

[0095] This embodiment uses the aforementioned broadband modulated multi-channel radiation thermometry device to perform non-contact measurement on a high-temperature heat source about 400 meters away. Through the combined operation of multi-channel broadband synchronous imaging, on-chip system preprocessing, and external temperature inversion calculation platform, dynamic reconstruction of the real temperature field and emissivity distribution is achieved.

[0096] First, the heat source to be tested is placed within the imaging field of view of the telephoto zoom lens. Based on the target distance of approximately 400 meters, the focal length, focus position, and aperture parameters of the lens are adjusted by the control unit so that the imaging plane obtains a radiation image with resolvable structural details and light energy within the chip's recordable range.

[0097] Subsequently, the radiation signal from the heat source is sequentially passed through a broadband modulation optical window and a telephoto zoom lens into a broadband modulation multimodal spectral chip. The broadband modulation optical window adjusts the transmission ratio of different bands through a multilayer broadband modulation film system, so that the radiation signal entering the chip exhibits different spectral modulation characteristics in nine broadband channels, enhancing the anti-saturation capability of the high-temperature section and improving the distinction between channels. The broadband modulation multimodal spectral chip simultaneously forms a nine-channel broadband modulation radiation image in a single exposure, with each channel having a different broadband transmittance distribution.

[0098] After image formation, the on-chip system performs shadow correction, chromatic aberration correction, and spectral image segmentation on the nine-channel broadband modulated radiometric image. Based on the pixel-level coding structure, the channels are split into nine independent spectral modulation images, ensuring that the preprocessed channel data has a unified spatial reference and amplitude consistency. The preprocessed data is then sent to the temperature inversion calculation platform via a high-speed network port for solution processing.

[0099] The multimodal radiation thermometry method of this embodiment can be described as follows: Figure 7 The data processing flow is as follows: First, the broadband light signal emitted by the target enters the lens and forms a spectral modulation image with band-distinguishing characteristics through a broadband modulation optical window. This image is then simultaneously acquired through multiple channels by a broadband modulation multi-mode spectral chip. Subsequently, the on-chip system preprocesses the acquired spectral data to separate the nine-channel broadband modulation radiation image acquired in a single exposure into independent spectral channel data. After data splitting, an external temperature inversion calculation platform performs a joint inversion of the temperature field and spectral emissivity field based on a broadband modulation response model. This is achieved by solving the multi-channel radiation equations to construct the true temperature and material emissivity distribution. During the inversion process, the temperature inversion calculation platform loads the corresponding broadband modulation transmission function from the modulation database and uses the broadband modulation response model and the emissivity spectral basis expansion model to calculate the temperature... With emissivity parameters Perform a joint solution;

[0100] During the solution process, the temperature inversion calculation platform introduces structural image constraints to ensure the consistency between the temperature field and the target boundary, and to avoid the drift of the inversion temperature values ​​caused by noise or strong background light during the inversion process.

[0101] The temperature inversion calculation platform introduces time series consistency constraints along with structural image constraints to suppress non-physical jumps in high-speed dynamic scenes, so that the inversion results can maintain continuous and stable performance even when the distance is far, the outdoor environment is large, or the target is rapidly changing.

[0102] Firstly, regarding modal constraints in the spatial structural dimension, the spectral emissivity should exhibit material uniformity in space; therefore, structural image constraints are introduced:

[0103]

[0104] Furthermore, regarding modal constraints in the time series dimension, the temperature and emissivity of the target under test exhibit thermophysical regularities as they change over time, with second-order time smoothing constraints for temperature and first-order time smoothing constraints for emissivity. Therefore, a time series consistency constraint is introduced:

[0105]

[0106] The final multimodal fusion optimization objective is to be constructed as follows:

[0107]

[0108] The coordinates on the imaging plane are The material emissivity spectral function at a given location is obtained by combining the expansion coefficients of each emissivity basis function;

[0109] Represents the coordinates on the imaging plane as Adjacent or structurally related coordinates are The material emissivity spectral function at a given location is used to describe a region with spatially consistent material properties.

[0110] This represents a coefficient used to adjust the structural consistency weights between different pixels. In this embodiment, its function is to give higher constraint weights to material-consistent regions and lower constraint strengths at the edges, based on the edge strength or gradient information of the structural image.

[0111] This represents the set of pixels used to enforce structural consistency constraints, i.e., the range of pixel coordinates for the entire imaging region;

[0112] Indicates the first in the time series Temperature inversion results at the frame location;

[0113] and These represent the temperature inversion results of adjacent time frames, which are used in this embodiment to construct the second-order time smoothing term of the temperature sequence so that the temperature change over time satisfies physical continuity.

[0114] Indicates at time step The corresponding emissivity spectral function;

[0115] This represents the weighting coefficients used to balance the first-order smoothing constraint term that balances the emissivity change over time;

[0116] This is the spectral fitting error term, which in this embodiment reflects the degree of matching between the multi-channel broadband modulation response and the inversion model. It is the most core physical data-driven term in the joint optimization.

[0117] and These are adjustment factors for spatial structure consistency constraints and time series consistency constraints, respectively, used to balance the impact of the three types of loss terms on the overall optimization objective.

[0118] This implementation method, through the above optimizations, can ensure that the spectral emissivity conforms to the physical target spectrum in both spatial and temporal dimensions, so that the obtained temperature field still has continuity and physical rationality under strong background light, long-distance attenuation, and drastic changes in the target.

[0119] After the joint inversion is completed, the reconstructed test results are as follows: Figure 8 As shown, for the measurement scenario of this embodiment, the system can generate temperature trajectories of hot spots, local heating rate curves, and curves showing the change of material surface emissivity over time, and supports temperature alarms, threshold reminders, and data storage.

[0120] Finally, the temperature inversion calculation platform sends commands to the camera to complete the measurement process, including stopping exposure, saving parameters, and resetting the lens. This embodiment thus completes a full long-distance broadband modulated multimodal radiometric thermometry process.

[0121] The above detailed description of the technical solution provided by the present invention is intended to highlight the advantages and benefits of the technical solution provided by the present invention. However, the above detailed embodiments are not intended to limit the scope of protection of the present invention. Any reasonable modifications and improvements to the present invention, recombination of embodiments, and equivalent substitutions based on the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0122] Those skilled in the art will understand that the above description is merely a preferred embodiment of the present invention, and the features described in the various embodiments and / or claims disclosed in the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle scope of the present invention should be considered to fall within the protection scope of the present invention.

[0123] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if these modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include these modifications and modifications.

Claims

1. A spectral modulation radiation thermometry device, characterized in that, include: A broadband modulation optical window (5) is set at the incident end to perform broadband modulation on the incident radiation from the target under test; A telephoto zoom lens (2) is positioned behind the broadband modulation optical window (5) for imaging broadband modulation radiation; A broadband modulation multimodal spectral chip (1) is disposed after the telephoto zoom lens (2) and is used to simultaneously acquire multi-channel broadband modulation radiation images in a single exposure. The system-on-a-chip is connected to the broadband modulation multimodal spectral chip (1) and is used to perform shadow correction, color difference correction and spectral image segmentation on the multichannel broadband modulation radiometric image; The data interface component connects to the system-on-a-chip and is used for data interaction between the temperature inversion calculation platform and the temperature measuring device. The temperature inversion calculation platform communicates with the on-chip system through a data interface component to obtain the true temperature field, emissivity distribution, and heating sequence of the target under test.

2. The apparatus according to claim 1, characterized in that, The device further includes: The control unit (3) is connected to the telephoto zoom lens (2) and is used to control the focal length, focus position and aperture parameters of the telephoto zoom lens (2). The housing (4) has the wide-spectrum modulation optical window (5) and data interface components installed at both ends of the housing (4), and the telephoto variable zoom lens (2), wide-spectrum modulation multimodal spectral chip (1), on-chip system and control unit (3) installed inside the housing (4).

3. The apparatus according to claim 1, characterized in that, The broadband modulation optical window (5) adopts a multilayer broadband modulation film system.

4. The apparatus according to claim 1, characterized in that, The broadband modulation multimodal spectral chip (1) integrates multiple broadband modulation channels with different broadband transmittance weights on a single image plane according to a preset channel coding structure.

5. The apparatus according to claim 1, characterized in that, The data interface components include a high-speed network port (6), a multi-core interface (7), and a serial port (8).

6. The apparatus according to claim 1, characterized in that, The telephoto variable zoom lens (2) has a large aperture and long focal length, and is suitable for working distances of 1 to 1000m and above.

7. The apparatus according to claim 6, characterized in that, The large light-transmitting aperture The long focal length .

8. The apparatus according to claim 1, characterized in that, The temperature inversion calculation platform is based on a broadband modulation response model, an emissivity spectral basis expansion model, and time-domain regularization to construct an inversion framework, and jointly solves the real temperature field and emissivity distribution.

9. A method for spectral modulation radiation thermometry, characterized in that, The method is implemented based on the apparatus according to any one of claims 1-8, and includes the following steps: S1. The incident radiation of the target under test is collected and passed through the broadband modulation optical window (5) and the long focal length variable lens (2) in sequence, and a multi-channel broadband modulation radiation image is formed on the broadband modulation type multimodal spectral chip (1). S2. The on-chip system performs preprocessing and cross-channel spatial registration on the multi-channel broadband modulated radiometric image to obtain multi-channel radiometric data with a unified spatial reference. S3. Input the multi-channel radiation data into the temperature inversion calculation platform, construct the inversion framework based on the broadband modulation response model, the emissivity spectrum basis expansion model and the time domain regularization, and jointly solve the real temperature field and emissivity distribution. S4. Based on the joint solution results, structural image constraints and time series consistency constraints are further introduced to obtain the true temperature field, emissivity distribution and heating sequence of the target under test.

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