Intelligent laser positioning and long-distance high-precision infrared temperature measurement method and system

Abstract

The application provides a kind of intelligent laser positioning and long-distance high-precision infrared temperature measurement method and system, including collecting infrared radiation signal and generating initial temperature value by infrared temperature measurement module;Through line laser cross positioning module, laser cross point is projected, and the coaxial alignment state of temperature measurement optical axis and laser cross point is determined;After meeting the alignment condition, the real-time distance measured by the ranging module is obtained;According to the real-time distance, the measurement spot diameter is calculated, and the initial temperature value is distance compensated;Through the environment detection module, the environment parameters are collected, and the temperature value after distance compensation is environment compensated;Output the final temperature measurement result, realize positioning accurate, industrial grade anti-interference, long-distance small area high-precision temperature measurement.

Description

Technical Field

[0001] This invention relates to the field of industrial non-contact temperature measurement technology, and in particular to an infrared temperature measurement method and system with intelligent laser positioning and long-distance high precision. Background Technology

[0002] Non-contact infrared temperature measurement technology is widely used in industrial online inspection, equipment inspection, and precision temperature measurement scenarios because of its fast response speed and the fact that it does not require contact with the target being measured.

[0003] However, existing single-point infrared temperature measurement devices face the following technical problems in practical use: Single-point infrared temperature measurement cannot intuitively and accurately locate the temperature measurement point, especially when measuring temperature at a distance. Operators find it difficult to accurately align the temperature probe with the target area, and the temperature measurement spot is easily mixed with the thermal radiation of the background environment, resulting in distorted temperature measurement data. Although the traditional single-point laser positioning method can provide visual indication, the laser indicator point will shift from the temperature measurement optical axis as the temperature measurement distance changes, making it impossible to ensure that the laser mark and the temperature measurement spot are always coaxially aligned, causing the positioning accuracy to be heavily dependent on the operating distance. Existing solutions lack real-time sensing and temperature compensation mechanisms for temperature measurement distance. When the temperature measurement distance changes, the influence of atmospheric attenuation on infrared radiation transmission is not effectively corrected, further reducing the accuracy of temperature measurement. Environmental factors such as ambient light, temperature and humidity, and concentration of suspended particulate matter in the air in industrial sites can all interfere with infrared temperature measurement results, and existing devices lack comprehensive compensation capabilities for the above environmental parameters, resulting in insufficient temperature measurement stability and reliability in complex industrial environments.

[0004] Therefore, how to achieve precise positioning, industrial-grade anti-interference, and high-precision temperature measurement over long distances and small areas is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides an infrared temperature measurement method and system with intelligent laser positioning and long-distance high precision, which can achieve accurate positioning, industrial-grade anti-interference, and long-distance high-precision temperature measurement in small areas.

[0006] On one hand, the present invention provides an infrared temperature measurement method with intelligent laser positioning and long-distance high precision, comprising: The system comprises an infrared temperature measurement module, a line laser cross-positioning module, a ranging module, an environmental detection module, and a control module. At least two sets of line lasers from the line laser cross-positioning module are arranged tangentially to the shape of the infrared temperature measurement module, with each line laser beam intersecting at the center of the temperature measurement optical axis of the infrared temperature measurement module. The control module is connected to the infrared temperature measurement module, the line laser cross-positioning module, the ranging module, and the environmental detection module. The method is used in the control module, and the method includes: The infrared temperature measurement module acquires the infrared radiation signal of the target under test and generates the initial temperature value of the target under test based on the infrared radiation signal. The laser intersection point is projected onto the target under test by the line laser intersection positioning module, the position information of the laser intersection point is obtained, and the coaxial alignment state of the temperature measuring optical axis and the laser intersection point is determined according to the position information. When the coaxial alignment state meets the preset alignment conditions, the real-time distance between the infrared temperature measurement module and the target measured by the ranging module is obtained. The diameter of the measuring spot of the infrared temperature measuring module on the surface of the target is calculated based on the real-time distance, and the initial temperature value is compensated for the distance based on the real-time distance to generate a distance-compensated temperature value. The environmental detection module collects at least one environmental parameter of the environment in which the infrared temperature measurement module is located, and performs environmental compensation on the distance-compensated temperature value based on the environmental parameter to generate an environmentally compensated temperature value. The environmentally compensated temperature value is output as the final temperature measurement result of the target being measured.

[0007] On the other hand, the present invention also provides an infrared temperature measurement system with intelligent laser positioning and long-distance high precision, comprising: The system comprises an infrared temperature measurement module, a line laser cross-positioning module, a ranging module, an environmental detection module, and a control module. At least two sets of line lasers from the line laser cross-positioning module are arranged tangentially to the shape of the infrared temperature measurement module, with each line laser beam intersecting at the center of the temperature measurement optical axis of the infrared temperature measurement module. The control module is connected to the infrared temperature measurement module, the line laser cross-positioning module, the ranging module, and the environmental detection module. The control module is configured to execute the method described above.

[0008] The present invention provides an infrared temperature measurement method and system with intelligent laser positioning and long-distance high precision. The infrared temperature measurement module collects infrared radiation signals and generates an initial temperature value. The line laser cross-positioning module projects the laser cross point and determines the coaxial alignment state between the temperature measurement optical axis and the laser cross point. After the alignment conditions are met, the real-time distance measured by the ranging module is obtained. The diameter of the measurement spot is calculated based on the real-time distance and the initial temperature value is compensated for distance. Finally, the environmental parameters are collected by the environmental detection module, environmental compensation is performed, and the final temperature measurement result is output. This achieves accurate positioning, industrial-grade anti-interference, and long-distance high-precision temperature measurement in small areas. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of the infrared temperature measurement system with intelligent laser positioning and long-distance high precision provided in an embodiment of the present invention; Figure 2 This is a flowchart illustrating the infrared temperature measurement method with intelligent laser positioning and long-distance high precision provided in this embodiment of the invention. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0012] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0013] Figure 1 This is a schematic diagram of the structure of the infrared temperature measurement system with intelligent laser positioning and long-distance high precision provided in an embodiment of the present invention. Figure 1 As shown, the system may include an infrared temperature measurement module 11, a line laser cross-positioning module 12, a ranging module 13, an environmental detection module 14, and a control module 15. At least two sets of line lasers from the line laser cross-positioning module 12 are arranged tangentially to the shape of the infrared temperature measurement module 11, with each line laser beam crossing at the center of the temperature measurement optical axis of the infrared temperature measurement module 11. The control module 15 is connected to the infrared temperature measurement module 11, the line laser cross-positioning module 12, the ranging module 13, and the environmental detection module 14.

[0014] Based on the above structure, the control module can execute the infrared temperature measurement method with intelligent laser positioning and long-distance high precision in the following manner: Specifically, Figure 2This is a flowchart illustrating the infrared temperature measurement method with intelligent laser positioning and long-distance high precision provided in this embodiment of the invention.

[0015] like Figure 1 As shown, the infrared temperature measurement method with intelligent laser positioning and long-distance high precision provided in this embodiment of the invention mainly includes the following steps: 101. The infrared radiation signal of the target under test is collected by the infrared temperature measurement module, and the initial temperature value of the target under test is generated based on the infrared radiation signal. 102. Project the laser intersection point onto the target under test through the line laser cross-positioning module, obtain the position information of the laser intersection point, and determine the coaxial alignment state between the temperature measuring optical axis and the laser intersection point based on the position information; 103. When the coaxial alignment meets the preset alignment conditions, obtain the real-time distance between the infrared temperature measurement module and the target being measured, as measured by the ranging module. 104. Calculate the diameter of the infrared temperature measurement module on the surface of the target being measured based on the real-time distance, and perform distance compensation on the initial temperature value based on the real-time distance to generate the temperature value after distance compensation. 105. Collect at least one environmental parameter of the environment in which the infrared temperature measurement module is located through the environmental detection module, perform environmental compensation on the distance-compensated temperature value based on the environmental parameter, and generate an environmentally compensated temperature value. 106. Output the temperature value after environmental compensation as the final temperature measurement result of the target.

[0016] In this implementation, the line laser cross-positioning module is a laser projection device composed of at least two sets of visible light lasers. Each set of line lasers is arranged tangentially to the shape of the infrared temperature measurement module, so that the intersection point of each line laser beam in space falls precisely on the center line of the temperature measurement optical axis of the infrared temperature measurement module. Since the relative positions of each line laser and the infrared temperature measurement module are fixed, the intersection point of the line laser beams is always located at the center of the temperature measurement optical axis, regardless of the temperature measurement distance. Therefore, no matter how far away the target is, the position indicated by the laser intersection point is the center position of the temperature measurement spot.

[0017] The ranging module can use a time-of-flight ranging sensor, which emits laser pulses and receives the pulse signals reflected back from the target, measures the time difference of the laser pulses, and then calculates the real-time distance between the infrared temperature measurement module and the target.

[0018] The environmental detection module includes at least one of an ambient illuminance sensor, a temperature and humidity sensor, and a particulate matter concentration sensor, used to collect the ambient illuminance, temperature, humidity, and particulate matter concentration values ​​of the environment in which the infrared temperature measurement module is located. The preset alignment condition refers to the condition that is met when the laser crosspoint is clearly located on the surface of the target being measured, and the position of this crosspoint coincides with the landing point of the center of the infrared temperature measurement optical axis on the target surface.

[0019] In a specific implementation process, the control module first activates the infrared temperature measurement module. The infrared detector in the infrared temperature measurement module receives the infrared thermal radiation signal radiated from the surface of the target being measured. This infrared radiation signal is converged to the sensitive element of the infrared detector through the internal optical system. The infrared detector converts the radiation signal into an electrical signal. Based on this electrical signal and combined with the ambient reference temperature inside the infrared temperature measurement module, the control module calculates the initial temperature value of the target being measured using Planck's radiation law or a pre-calibrated temperature-voltage curve.

[0020] Simultaneously, the control module illuminates all the line lasers in the line laser cross-positioning module, projecting two intersecting line laser beams onto the surface of the target. These beams converge to form a clear laser intersection point. Because the line lasers are tangentially arranged to the infrared temperature measurement module, and the laser beams intersect at the center of the temperature measurement optical axis, the position of this laser intersection point is the point where the center of the temperature measurement optical axis falls on the target surface; the two are always coaxial. The operator adjusts the orientation of the infrared temperature measurement module based on the position of this laser intersection point, aligning the laser intersection point with the small area to be measured on the target. The control module acquires the position information of the laser intersection point, which is the spatial coordinate data of the laser intersection point on the target surface. Based on this position information, the control module determines that the temperature measurement optical axis and the laser intersection point are in a coaxial alignment state, satisfying the preset alignment conditions.

[0021] Once the coaxial alignment meets the preset alignment conditions, the control module triggers the ranging module to perform distance measurement. The ranging module emits a ranging laser pulse towards the target and receives the echo signal reflected back from the target's surface. By calculating the time difference between the laser pulse emission time and the echo signal reception time, and combining this with the speed of light, the real-time distance between the infrared temperature measurement module and the target is calculated. After acquiring this real-time distance, the control module calculates the diameter of the measurement spot of the infrared temperature measurement module on the target's surface. Following a pre-stored distance compensation algorithm, it determines the corresponding distance compensation coefficient based on the real-time distance and uses this coefficient to perform distance compensation calculations on the initial temperature value, generating a distance-compensated temperature value.

[0022] After distance compensation is completed, the control module collects at least one environmental parameter through the environmental detection module. This parameter includes ambient illuminance, temperature, humidity, and particulate matter concentration. Based on the collected environmental parameters, the control module determines the corresponding environmental compensation coefficient and uses this coefficient to correct the distance-compensated temperature value, generating the environmentally compensated temperature value. Finally, the control module outputs the temperature value after distance and environmental compensation as the final temperature measurement result to the display module or uploads it to the remote monitoring terminal via the communication module.

[0023] This embodiment achieves permanent coaxial alignment between the laser intersection point and the temperature measuring optical axis through line laser cross-positioning, regardless of the temperature measuring distance. Operators only need to align the laser intersection point with the area to be measured to ensure accurate coverage of the target area by the temperature measuring spot, effectively avoiding the positioning inaccuracy caused by distance shift in traditional single-point lasers. Simultaneously, this embodiment combines real-time distance compensation and multi-dimensional environmental compensation to eliminate interference from temperature measuring distance changes and environmental factors on temperature measuring accuracy, improving the accuracy of long-distance temperature measurement and stability in complex industrial environments.

[0024] In some embodiments, step 104, calculating the diameter of the measurement spot of the infrared temperature measurement module on the surface of the target object based on the real-time distance, includes: Obtain the optical resolution parameters of the infrared temperature measurement module, wherein the optical resolution parameters are used to characterize the field of view of the infrared temperature measurement module; The half-angle of the field of view of the infrared temperature measurement module is determined according to the optical resolution parameters. The half-angle of the field of view is the angle between the field boundary line of the infrared temperature measurement module and the temperature measurement optical axis. Based on the real-time distance and the half-angle of the field of view, the projection position of the field of view boundary line on the surface of the target being measured is determined, and the distance between the projection position and the point where the optical axis of the temperature measuring optical axis falls on the surface of the target being measured is jointly defined by the real-time distance and the half-angle of the field of view. Based on the projection positions corresponding to the field boundary lines on both sides of the optical axis landing point, the span between the two projection positions is determined, and the span is used as the diameter of the measured light spot.

[0025] In this embodiment, the optical resolution parameter is an inherent parameter of the infrared temperature measurement module, used to characterize the field of view of the infrared temperature measurement module. It is determined by the design of the infrared optical system, and the field of view refers to the maximum angular range of infrared radiation that the infrared temperature measurement module can receive. The half-angle of the field of view is half of the field of view, that is, the angle between the temperature measuring optical axis and the field of view boundary line. The optical axis landing point refers to the intersection of the temperature measuring optical axis and the surface of the target being measured. The projection position of the field of view boundary line refers to the position corresponding to the line of sight extending from the edge of the infrared temperature measurement module's field of view to the surface of the target being measured.

[0026] In a specific implementation, the control module reads the pre-stored optical resolution parameters of the infrared temperature measurement module from the storage module; these parameters are specifically the field of view angle values. The control module divides the field of view angle value by two to obtain the half-angle of the field of view. Given the real-time distance and the half-angle of the field of view, the control module determines the projection position of the field of view boundary line on the surface of the target object based on trigonometric relationships. Specifically, with the point where the temperature measurement optical axis falls on the surface of the target object as the center, the field of view boundary line extends from the infrared temperature measurement module along the direction of the half-angle of the field of view to the surface of the target object. The lateral distance between its projection position and the point where the optical axis falls is equal to the real-time distance multiplied by the tangent of the half-angle of the field of view. Since the field of view boundary line is symmetrically distributed on both sides of the optical axis, there is a projection position of the field of view boundary line on each side of the point where the optical axis falls. The control module calculates the span between the two projection positions, which is the diameter of the measurement spot of the infrared temperature measurement module on the surface of the target object.

[0027] This embodiment realizes the real-time calculation of the diameter of the measuring spot at any temperature measurement distance, providing operators with a quantitative basis for the current spot coverage area, effectively avoiding the problem of background temperature mixing due to excessively large spot size affecting the temperature measurement accuracy, and ensuring the reliability of temperature measurement in small areas at long distances.

[0028] In some embodiments, step 104, performing distance compensation on the initial temperature value based on the real-time distance to generate a distance-compensated temperature value, includes: Obtain a pre-stored distance compensation coefficient table, which contains compensation coefficients corresponding to multiple distance intervals; Match the corresponding target compensation coefficient in the distance compensation coefficient table based on the real-time distance; The initial temperature value is calculated for distance compensation based on the target compensation coefficient to generate the distance-compensated temperature value.

[0029] In this embodiment, the distance compensation coefficient table is a data structure obtained in advance through calibration experiments and stored in the storage unit of the control module, recording the correspondence between multiple distance intervals and compensation coefficients. The compensation coefficient is a correction factor used to correct the temperature measurement deviation caused by the attenuation of infrared radiation during atmospheric transmission with increasing propagation distance.

[0030] In a specific implementation, after acquiring the real-time distance, the control module compares and matches this real-time distance with various distance intervals in the distance compensation coefficient table to determine the corresponding distance interval. Then, it reads the target compensation coefficient corresponding to that distance interval from the table. Each distance interval in the distance compensation coefficient table is configured with a compensation coefficient, the specific value of which is determined by multi-point distance calibration experiments before shipment. The calibration principle of the compensation coefficient is as follows: given the standard blackbody temperature, the blackbody temperature is measured at multiple standard distances using an infrared temperature measurement module. The correction factor for the deviation between the measured value and the standard value at each distance is used as the compensation coefficient for that distance interval, ensuring that the initial temperature value and the compensation coefficient, after calculation, approximate the true temperature value. After obtaining the target compensation coefficient, the control module calculates the initial temperature value and the target compensation coefficient according to a predetermined compensation calculation rule, such as multiplying the initial temperature value by the target compensation coefficient, to generate the distance-compensated temperature value.

[0031] This embodiment achieves quantitative compensation for the atmospheric attenuation effect caused by changes in temperature measurement distance, making the temperature measurement results at different distances consistent and comparable, and improving the accuracy of long-distance temperature measurement.

[0032] In some embodiments, in step 105, at least one environmental parameter of the environment in which the infrared temperature measurement module is located is collected by the environmental detection module, including: The ambient illuminance value of the environment is collected by the ambient illuminance sensor in the environmental detection module. The temperature and humidity values ​​of the environment are collected by the temperature and humidity sensor in the environmental detection module. The particulate matter concentration value of the environment is collected by the particulate matter concentration sensor in the environmental detection module; Environmental compensation is performed on the distance-compensated temperature value based on the environmental parameters, including: An environmental compensation coefficient is determined based on at least one of the ambient illuminance value, the temperature value, the humidity value, and the particulate matter concentration value. The temperature value after distance compensation is corrected according to the environmental compensation coefficient to generate the environmentally compensated temperature value.

[0033] In this embodiment, the surface absorptivity parameter characterizes the ability of the target surface to absorb laser radiation energy. Targets of different materials, colors, and surface roughness exhibit different absorptivity to laser radiation. The allowable temperature rise parameter characterizes the maximum temperature rise allowed under normal use of the target or under temperature measurement accuracy requirements. This parameter is preset based on the material properties of the target or the temperature measurement accuracy requirements. The temperature rise threshold is the critical value of temperature change corresponding to the allowable temperature rise parameter.

[0034] In a specific implementation process, when the control module controls the line laser cross-positioning module to illuminate the laser for positioning indication, the control module first acquires the ambient illuminance value collected by the ambient illuminance sensor in the environmental detection module, and reads the pre-recorded surface absorptivity parameters and allowable temperature rise parameters of the target being measured from the storage module. The control module determines the base laser power based on the ambient illuminance value; a higher ambient illuminance value indicates stronger ambient light, requiring higher laser power to ensure clear visibility of the laser cross-point in strong light. The control module further determines a power correction coefficient based on the surface absorptivity parameter; a higher surface absorptivity indicates a stronger ability of the target to absorb laser energy. To prevent excessive temperature rise on the target surface due to laser irradiation, the power correction coefficient is reduced accordingly, resulting in a lower final laser output power. The control module calculates the laser output power based on the base laser power and the power correction coefficient, and simultaneously determines the target irradiation duration based on the allowable temperature rise parameter; a higher allowable temperature rise allows for a longer target irradiation duration. The control module then controls the line laser cross-positioning module to output laser power according to the calculated laser output power and target irradiation duration. During laser output, the control module monitors the real-time temperature change of the target object as measured by the infrared temperature measurement module. When the real-time temperature change exceeds the temperature rise threshold corresponding to the allowable temperature rise parameter, the control module immediately executes safety protection actions to reduce the laser output power or stop the laser output.

[0035] This embodiment achieves adaptive intelligent adjustment of laser power based on ambient illuminance and the characteristics of the target being measured. While ensuring that the laser indicator is clearly visible, it effectively avoids the problem of temperature rise of the target being measured due to laser irradiation, which would interfere with the temperature measurement accuracy. It has the dual effects of intelligent safety and accurate temperature measurement.

[0036] In some embodiments, determining the laser output power and target irradiation duration of the line laser cross-positioning module based on the ambient illuminance value, the surface absorptivity parameter, and the allowable temperature rise parameter includes: The base laser power is determined based on the ambient illuminance value; the higher the ambient illuminance value, the higher the base laser power. The power correction coefficient is determined based on the surface absorptivity parameter, and the higher the surface absorptivity, the lower the power correction coefficient. The laser output power is calculated based on the base laser power and the power correction factor; The target irradiation duration is determined based on the allowable temperature rise parameter; the higher the allowable temperature rise, the longer the target irradiation duration.

[0037] In a specific implementation, the control module pre-stores the correspondence between ambient illuminance values ​​and base laser power. This correspondence is obtained through experimental calibration: under multiple different ambient illuminance conditions, the minimum laser power required to make the laser intersection point clearly visible on the surface of the target is tested. A mapping relationship is established between each ambient illuminance value and the corresponding minimum laser power and stored in the control module. After obtaining the current ambient illuminance value, the control module determines the corresponding base laser power through this mapping relationship.

[0038] The control module also pre-stores the correspondence between surface absorptivity and power correction coefficient. A higher surface absorptivity indicates a stronger absorption capacity of the target laser, resulting in a more significant temperature rise effect at the same laser power. Therefore, a smaller power correction coefficient is needed to reduce the actual output laser power. After acquiring the surface absorptivity parameter, the control module determines the corresponding power correction coefficient using this correspondence.

[0039] The control module multiplies the base laser power by a power correction factor to obtain the laser output power. In this way, the laser output power can adapt to ambient lighting conditions to ensure clear indication, and can also be adaptively adjusted according to the heat absorption characteristics of the target being measured to prevent excessive temperature rise.

[0040] The control module also determines the target irradiation duration based on the allowable temperature rise parameter. This allowable temperature rise parameter is preset by the user according to the material's temperature tolerance or the required temperature measurement accuracy. For heat-sensitive materials or high-precision temperature measurement scenarios, the allowable temperature rise is lower, and the target irradiation duration is correspondingly shorter; for heat-resistant materials or scenarios with lower temperature measurement accuracy requirements, the allowable temperature rise is higher, and the target irradiation duration can be extended accordingly. The control module has a pre-stored correspondence between allowable temperature rise and target irradiation duration; after obtaining the allowable temperature rise parameter, the target irradiation duration is determined using this correspondence.

[0041] This embodiment achieves precise determination of laser output power and target irradiation time by multiple factors. While ensuring the laser indication effect, it minimizes the interference of the laser on the temperature field of the measured target, thus ensuring the authenticity and reliability of the temperature measurement data.

[0042] In some embodiments, after acquiring the infrared radiation signal of the target being measured through the infrared temperature measurement module, the method further includes: The high-precision ambient temperature reference module acquires the reference ambient temperature value, and the high-precision ambient temperature reference module is thermally isolated from the infrared temperature measurement module. The infrared temperature measurement module is zero-point calibrated based on the reference ambient temperature value. The step of generating the initial temperature value of the target based on the infrared radiation signal includes: The initial temperature value is generated based on the infrared radiation signal collected by the infrared temperature measurement module after zero-point calibration.

[0043] In this embodiment, the high-precision ambient temperature reference module is a temperature detection unit independent of the infrared temperature measurement module. This module is physically thermally isolated from the infrared temperature measurement module; that is, a heat-insulating structure is provided between the high-precision ambient temperature reference module and the infrared temperature measurement module, and the high-precision ambient temperature reference module is positioned away from the internal heat source of the infrared temperature measurement module. Zero-point calibration refers to the process of offset correction of the output signal of the infrared temperature measurement module based on an accurate reference ambient temperature value.

[0044] In a specific implementation, the control module acquires the reference ambient temperature value collected by the high-precision ambient temperature reference module simultaneously with or before starting the infrared temperature measurement module to collect infrared radiation signals. Because the detectors inside the infrared temperature measurement module are sensitive to changes in ambient temperature, their dark current and responsivity drift with these changes. Therefore, zero-point calibration of the infrared temperature measurement module is required based on an accurate reference ambient temperature value. Specifically, the control module uses the reference ambient temperature value collected by the high-precision ambient temperature reference module as the zero-point reference temperature of the infrared temperature measurement module. When the infrared temperature measurement module does not receive external infrared radiation, the temperature value corresponding to its output signal should be consistent with the reference ambient temperature value. If they are inconsistent, the internal bias parameters of the infrared temperature measurement module are adjusted to make them consistent. After zero-point calibration, the control module controls the infrared temperature measurement module to collect the infrared radiation signal of the target being measured and generates an initial temperature value based on the output signal of the zero-point calibrated infrared temperature measurement module.

[0045] In some embodiments, after obtaining the real-time distance between the infrared temperature measurement module and the target measured by the ranging module, the method further includes: The current distance coefficient ratio of the infrared temperature measurement module is calculated based on the real-time distance and the diameter of the measured spot. Determine whether the current distance coefficient ratio is greater than or equal to a preset distance coefficient ratio threshold; When the current distance coefficient ratio is less than the preset distance coefficient ratio threshold, the optical focusing parameters of the infrared temperature measurement module are adjusted to increase the current distance coefficient ratio to be greater than or equal to the preset distance coefficient ratio threshold.

[0046] In this embodiment, the distance coefficient ratio is a parameter used in the field of infrared thermometry to characterize the spatial resolution of a temperature measuring device. It is defined as the ratio of the temperature measuring distance to the diameter of the measuring spot. The larger the distance coefficient ratio, the smaller the diameter of the measuring spot at the same distance, and the higher the spatial resolution. The preset distance coefficient ratio threshold is a pre-set minimum spatial resolution requirement.

[0047] In one specific implementation, after acquiring the real-time distance and calculating the measurement spot diameter, the control module divides the real-time distance by the measurement spot diameter to obtain the current distance coefficient ratio. The control module compares the current distance coefficient ratio with a preset distance coefficient ratio threshold read from the storage module. If the current distance coefficient ratio is greater than or equal to the preset distance coefficient ratio threshold, it indicates that the current measurement spot diameter meets the measurement requirements, and temperature measurement can continue. If the current distance coefficient ratio is less than the preset distance coefficient ratio threshold, it indicates that the current measurement spot diameter is too large, the measurement area exceeds the range of the target small area, and background temperature may be mixed into the measurement results. At this time, the control module sends a control command to the optical focusing adjustment mechanism of the infrared temperature measurement module to adjust the optical focusing parameters, such as adjusting the relative position between the lens groups to change the focal length of the optical system, so that the measurement spot diameter is reduced at the same temperature measurement distance, thereby increasing the current distance coefficient ratio to be greater than or equal to the preset distance coefficient ratio threshold.

[0048] This embodiment realizes the active adaptation and adjustment of the diameter of the temperature measurement spot, ensuring that high-precision temperature measurement of small targets can be achieved with a small spot at different temperature measurement distances, avoiding temperature measurement errors caused by an excessively large spot.

[0049] In some embodiments, the method further includes: The final temperature measurement result is compared with a preset temperature threshold. When the final temperature measurement result exceeds the preset temperature threshold, an over-temperature alarm signal is generated; Based on the over-temperature alarm signal, perform at least one of the following safety protection actions: cut off the laser output of the line laser cross-positioning module, reduce the laser output power of the line laser cross-positioning module, send an alarm notification to the remote monitoring terminal, and record the current temperature measurement data and the corresponding timestamp.

[0050] In a specific implementation, after calculating the final temperature measurement result, the control module compares it with a preset temperature threshold read from the storage module. The preset temperature threshold is set by the user based on the normal operating temperature range or safe temperature limit of the device under test. If the final temperature measurement result does not exceed the preset temperature threshold, it indicates that the temperature of the target under test is within the normal range, and the control module continues to execute the temperature measurement process normally. If the final temperature measurement result exceeds the preset temperature threshold, it indicates that the target under test has an over-temperature anomaly, and the control module immediately generates an over-temperature alarm signal. Based on this over-temperature alarm signal, the control module performs various safety protection actions individually or in combination: cutting off the laser output of the line laser cross-positioning module to prevent additional safety risks that may be caused by continuous laser irradiation under abnormally high temperatures; reducing the laser output power of the line laser cross-positioning module to reduce laser energy output while maintaining basic positioning indication functions; sending an alarm notification to the remote monitoring terminal so that remote monitoring personnel can be informed of the over-temperature anomaly in a timely manner; recording the current temperature measurement data and the corresponding timestamp, and storing the relevant data of the over-temperature event in the storage module for subsequent fault analysis and tracing.

[0051] It should be noted that all relevant information that may be involved in the various embodiments of the present invention is processed in strict accordance with the requirements of laws and regulations, following the principles of legality, legitimacy, and necessity, based on the reasonable purpose of the business scenario, and is information that users actively provide or generate during the use of the product / service, as well as information obtained with user authorization.

[0052] The information processed by this invention may vary depending on the specific product / service scenario and should be based on the specific scenario in which the user uses the product / service. This may involve user account information, device information, or other related information. This invention will treat the relevant information and its processing with the utmost diligence.

[0053] This invention places great emphasis on the security of relevant information and has adopted reasonable and feasible security protection measures that comply with industry standards to protect user information and prevent unauthorized access, public disclosure, use, modification, damage or loss of relevant information.

[0054] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0055] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for infrared temperature measurement with intelligent laser positioning and long-distance high precision, characterized in that, The system includes an infrared temperature measurement module, a line laser cross-positioning module, a ranging module, an environmental detection module, and a control module. At least two sets of line lasers from the line laser cross-positioning module are arranged tangentially to the shape of the infrared temperature measurement module, with each line laser beam intersecting at the center of the temperature measurement optical axis of the infrared temperature measurement module. The control module is connected to the infrared temperature measurement module, the line laser cross-positioning module, the ranging module, and the environmental detection module. The method is used in the control module, and the method includes: The infrared temperature measurement module acquires the infrared radiation signal of the target under test and generates the initial temperature value of the target under test based on the infrared radiation signal. The laser intersection point is projected onto the target under test by the line laser intersection positioning module, the position information of the laser intersection point is obtained, and the coaxial alignment state of the temperature measuring optical axis and the laser intersection point is determined according to the position information. When the coaxial alignment state meets the preset alignment conditions, the real-time distance between the infrared temperature measurement module and the target measured by the ranging module is obtained. The diameter of the measuring spot of the infrared temperature measuring module on the surface of the target is calculated based on the real-time distance, and the initial temperature value is compensated for the distance based on the real-time distance to generate a distance-compensated temperature value. The environmental detection module collects at least one environmental parameter of the environment in which the infrared temperature measurement module is located, and performs environmental compensation on the distance-compensated temperature value based on the environmental parameter to generate an environmentally compensated temperature value. The environmentally compensated temperature value is output as the final temperature measurement result of the target being measured.

2. The method according to claim 1, characterized in that, The diameter of the measurement spot of the infrared temperature measurement module on the surface of the target is calculated based on the real-time distance, including: Obtain the optical resolution parameters of the infrared temperature measurement module, wherein the optical resolution parameters are used to characterize the field of view of the infrared temperature measurement module; The half-angle of the field of view of the infrared temperature measurement module is determined according to the optical resolution parameters. The half-angle of the field of view is the angle between the field boundary line of the infrared temperature measurement module and the temperature measurement optical axis. Based on the real-time distance and the half-angle of the field of view, the projection position of the field of view boundary line on the surface of the target being measured is determined, and the distance between the projection position and the point where the optical axis of the temperature measuring optical axis falls on the surface of the target being measured is jointly defined by the real-time distance and the half-angle of the field of view. Based on the projection positions corresponding to the field boundary lines on both sides of the optical axis landing point, the span between the two projection positions is determined, and the span is used as the diameter of the measured light spot.

3. The method according to claim 1, characterized in that, Based on the real-time distance, distance compensation is performed on the initial temperature value to generate a distance-compensated temperature value, including: Obtain a pre-stored distance compensation coefficient table, which contains compensation coefficients corresponding to multiple distance intervals; Match the corresponding target compensation coefficient in the distance compensation coefficient table based on the real-time distance; The initial temperature value is calculated for distance compensation based on the target compensation coefficient to generate the distance-compensated temperature value.

4. The method according to claim 1, characterized in that, The environmental detection module collects at least one environmental parameter of the environment in which the infrared temperature measurement module is located, including: The ambient illuminance value of the environment is collected by the ambient illuminance sensor in the environmental detection module. The temperature and humidity values ​​of the environment are collected by the temperature and humidity sensor in the environmental detection module. The particulate matter concentration value of the environment is collected by the particulate matter concentration sensor in the environmental detection module; Environmental compensation is performed on the distance-compensated temperature value based on the environmental parameters, including: An environmental compensation coefficient is determined based on at least one of the ambient illuminance value, the temperature value, the humidity value, and the particulate matter concentration value. The temperature value after distance compensation is corrected according to the environmental compensation coefficient to generate the environmentally compensated temperature value.

5. The method according to claim 1, characterized in that, After projecting the laser intersection point onto the target through the line laser cross-positioning module, the method further includes: The environmental illuminance value collected by the environmental detection module is obtained, and the surface absorptivity parameter and allowable temperature rise parameter of the target under test are also obtained. The laser output power and target irradiation duration of the line laser cross-positioning module are determined based on the ambient illuminance value, the surface absorptivity parameter, and the allowable temperature rise parameter. The line laser cross-positioning module is controlled to output laser according to the laser output power and the target irradiation duration; During the laser output, the real-time temperature change of the target measured by the infrared temperature measurement module is monitored in real time. When the real-time temperature change exceeds the temperature rise threshold corresponding to the allowable temperature rise parameter, the laser output power is reduced or the laser output is stopped.

6. The method according to claim 5, characterized in that, The laser output power and target irradiation duration of the line laser cross-positioning module are determined based on the ambient illuminance value, the surface absorptivity parameter, and the allowable temperature rise parameter, including: The base laser power is determined based on the ambient illuminance value; the higher the ambient illuminance value, the higher the base laser power. The power correction coefficient is determined based on the surface absorptivity parameter, and the higher the surface absorptivity, the lower the power correction coefficient. The laser output power is calculated based on the base laser power and the power correction factor; The target irradiation duration is determined based on the allowable temperature rise parameter; the higher the allowable temperature rise, the longer the target irradiation duration.

7. The method according to claim 1, characterized in that, After acquiring the infrared radiation signal of the target object through the infrared temperature measurement module, the method further includes: The high-precision ambient temperature reference module acquires the reference ambient temperature value, and the high-precision ambient temperature reference module is thermally isolated from the infrared temperature measurement module. The infrared temperature measurement module is zero-point calibrated based on the reference ambient temperature value. The step of generating the initial temperature value of the target based on the infrared radiation signal includes: The initial temperature value is generated based on the infrared radiation signal collected by the infrared temperature measurement module after zero-point calibration.

8. The method according to claim 1, characterized in that, After obtaining the real-time distance between the infrared temperature measurement module and the target measured by the ranging module, the method further includes: The current distance coefficient ratio of the infrared temperature measurement module is calculated based on the real-time distance and the diameter of the measured spot. Determine whether the current distance coefficient ratio is greater than or equal to a preset distance coefficient ratio threshold; When the current distance coefficient ratio is less than the preset distance coefficient ratio threshold, the optical focusing parameters of the infrared temperature measurement module are adjusted to increase the current distance coefficient ratio to be greater than or equal to the preset distance coefficient ratio threshold.

9. The method according to any one of claims 1 to 8, characterized in that, Also includes: The final temperature measurement result is compared with a preset temperature threshold. When the final temperature measurement result exceeds the preset temperature threshold, an over-temperature alarm signal is generated; Based on the over-temperature alarm signal, perform at least one of the following safety protection actions: cut off the laser output of the line laser cross-positioning module, reduce the laser output power of the line laser cross-positioning module, send an alarm notification to the remote monitoring terminal, and record the current temperature measurement data and the corresponding timestamp.

10. An infrared temperature measurement system with intelligent laser positioning and long-distance high precision, characterized in that, The system includes an infrared temperature measurement module, a line laser cross-positioning module, a ranging module, an environmental detection module, and a control module. At least two sets of line lasers from the line laser cross-positioning module are arranged tangentially to the shape of the infrared temperature measurement module, with each line laser beam intersecting at the center of the temperature measurement optical axis of the infrared temperature measurement module. The control module is connected to the infrared temperature measurement module, the line laser cross-positioning module, the ranging module, and the environmental detection module. The control module is configured to perform the method according to any one of claims 1-9.

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