Temperature measurement device and system

Abstract

A temperature measuring device and system, the device comprising a shell, a temperature control assembly, an inner shell, a sample bearing assembly, a photoacoustic detection assembly, a pulsed laser emitter and a laser emission assembly; the shell has a containing space; the temperature control assembly is arranged on the inner wall of the shell, for controlling the temperature in the containing space; the inner shell is located in the containing space; the sample bearing assembly has a bearing area, for bearing a sample to be measured in the bearing area; the sample bearing assembly is arranged on the inner bottom wall of the inner shell; the photoacoustic detection assembly and the pulsed laser emitter are respectively arranged on the inner top wall of the inner shell, the pulsed laser emitter is used for emitting pulsed laser to the sample to be measured, and the photoacoustic detection assembly is used for detecting the photoacoustic signal generated by the sample to be measured in response to the pulsed laser; the side wall of the inner shell is provided with a window, the laser emission assembly is arranged at the edge of the window, and the laser output end of the laser emission assembly faces the bearing area; the laser emission assembly is configured to heat the sample by emitting laser to the sample. The device emits pulsed laser to the sample to be measured by the pulsed laser emitter and measures the temperature of the sample to be measured in real time based on the photoacoustic effect under heating, which improves the accuracy of measuring the temperature of the sample to be measured.

Description

Technical Field

[0001] This application relates to the field of temperature measurement technology, and more specifically, to a temperature measuring device and system. Background Technology

[0002] Existing temperature measurement technologies mainly include contact thermometry, infrared thermometry, and acoustic thermometry. Ultrasonic thermometry is a non-contact method that can measure tissue structure but not temperature; furthermore, the accuracy of ultrasound is limited and cannot meet the control requirements of laser and focused closed-loop thermotherapy. Fiber optic temperature sensors can measure the internal temperature of objects with high accuracy, but this method is invasive, requiring the insertion of optical fibers which may interfere with the laser medical process, and has low spatial resolution. While acoustic thermometry can obtain deep temperature information to some extent, its accuracy is often low and it is easily affected by the properties of the medium.

[0003] In particular, real-time acquisition of the temperature and material distribution inside an object during laser medical treatment can improve treatment safety and further optimize treatment parameters, which is of great significance in the medical field.

[0004] Therefore, the accuracy of current temperature measurement technology still needs to be improved. Summary of the Invention

[0005] The purpose of this application is to provide a temperature measuring device and system that emits pulsed laser light to the sample to be measured by a pulsed laser emitter and measures the temperature of the sample based on the photoacoustic effect, thereby improving the accuracy of temperature measurement of the sample.

[0006] In a first aspect, this application provides a temperature measuring device, including a housing, a temperature control component, an inner housing, a sample carrying component, a photoacoustic detection component, a pulsed laser emitter, and a laser emitting component; the housing has an accommodating space; the temperature control component is disposed on the inner wall of the housing and is used to control the temperature within the accommodating space; the inner housing is located within the accommodating space; the sample carrying component has a carrying area for carrying a sample to be measured in the carrying area; the sample carrying component is disposed on the inner bottom wall of the inner housing; the photoacoustic detection component and the pulsed laser are respectively disposed on the inner top wall of the inner housing, the pulsed laser is used to emit pulsed laser light to the sample to be measured, and the photoacoustic detection component is used to detect the photoacoustic signal generated by the thermal response of the sample to be measured to the pulsed laser light; a window is opened on the side wall of the inner housing, the laser emitting component is disposed at the edge of the window, and the laser output end of the laser emitting component faces the carrying area; the laser emitting component is configured to heat the sample by emitting laser light to the sample.

[0007] The aforementioned temperature measurement device emits pulsed laser light onto the sample to be measured via a pulsed laser emitter. A photoacoustic detection component detects the photoacoustic signal generated by the sample in response to the pulsed laser. Based on the photoacoustic effect, the temperature of the sample is measured, avoiding the invasiveness and limited measurement depth issues associated with contact temperature measurement. Since the laser emitted by the laser emitter can heat the interior of the sample, the temperature distribution under heating conditions can be obtained. Furthermore, the internal and external temperature distribution of the sample is necessarily non-uniform, meaning there is a temperature difference between the inside and outside. Therefore, the internal photoacoustic temperature measurement method can be used to evaluate the safety of laser heaters and the efficacy of laser thermotherapy.

[0008] In conjunction with the first aspect, optionally, the laser emitting assembly is sealed to the edge of the window.

[0009] The aforementioned temperature measuring device is sealed to the edge of the window via a laser emitting component, preventing leakage of coupling agent or other materials inside the inner shell, thus ensuring the accuracy of temperature measurement.

[0010] In conjunction with the first aspect, optionally, the photoacoustic detection assembly includes a photoacoustic detector and a detector moving mechanism; one connection end of the detector moving mechanism is connected to the top of the inner shell, and the other connection end of the detector moving mechanism is connected to the photoacoustic detector; the detector moving mechanism is configured to drive the photoacoustic detector to move in at least two dimensions within the inner shell.

[0011] The aforementioned temperature measuring device, by configuring a detector moving mechanism for the photoacoustic detector, enables the photoacoustic detector to slide in at least two directions. This allows for fine-tuning of the detection position during the detection of the photoacoustic signal generated by the photoacoustic detector on the sample to be measured, thereby obtaining the optimal detection position and further improving the accuracy of temperature measurement of the sample.

[0012] Referring to the figures, in some alternative embodiments, the sample carrier assembly may include a sample carrier element and a carrier element moving mechanism. One end of the carrier element moving mechanism may be connected to the inner bottom wall, and the other end of the carrier mechanism may be connected to the sample carrier element. The carrying area may be located on the sample carrier element. The carrier element moving mechanism may be configured to drive the sample carrier element to move in at least three dimensions.

[0013] In conjunction with the first aspect, optionally, the sample carrying assembly includes a sample carrier and a carrier moving mechanism; one connecting end of the carrier moving mechanism is connected to the inner bottom wall, and the other connecting end of the carrier mechanism is connected to the sample carrier; the carrying area is located on the sample carrier; the carrier moving mechanism is configured to drive the sample carrier to move in at least three dimensions.

[0014] The aforementioned temperature measuring device, by configuring a carrier moving mechanism for the sample carrier, allows the sample to be moved closer to the window through adjustment of the carrier moving mechanism to reduce heat loss, and also ensures that the sample is at the predetermined laser heating position. This further improves the accuracy of temperature measurement of the sample.

[0015] In conjunction with the first aspect, optionally, the sample carrier and the carrier moving mechanism are rotatably connected; wherein, the rotatable plane of the sample carrier is parallel to the orientation of the laser output end of the laser emitting assembly and intersects with the arrangement direction of the inner bottom wall and the inner top wall.

[0016] The temperature measuring device described above, through the rotatable connection between the sample carrier and the carrier moving mechanism, allows the sample to be rotated to adjust its position relative to the window, thereby further improving the accuracy of temperature measurement of the sample by increasing the flexibility of the sample carrier component.

[0017] In conjunction with the first aspect, optionally, the temperature control component includes a temperature control coil and a temperature controller; the temperature control coil is attached to the inner wall of the housing; both ends of the temperature control coil are respectively connected to the temperature controller; the temperature controller is configured to contain a temperature control medium, control the temperature of the temperature control medium and circulate it within the temperature control coil; the temperature control coil is configured to exchange heat with the air contained in the containment space under the circulation of the temperature control medium.

[0018] The aforementioned temperature measuring device, by specifically defining the temperature control components as a temperature control coil and a temperature controller, and by circulating a temperature control medium between the temperature control coil and the temperature controller to fine-tune the temperature inside the inner shell, further improves the accuracy of temperature measurement of the sample to be measured.

[0019] In conjunction with the first aspect, optionally, the temperature control coil is serpentine and conforms to the inner wall of the inner shell.

[0020] The aforementioned temperature measuring device, with its temperature control coil bent in a serpentine shape and attached to the inner wall of the inner shell, allows for a larger area of ​​the temperature control coil to be attached to the inner wall of the inner shell compared to spiral attachment methods. This further improves the ease of temperature control within the inner shell and ultimately enhances the accuracy of temperature measurement of the sample to be measured.

[0021] In conjunction with the first aspect, optionally, the temperature controller includes a cold bath machine.

[0022] The aforementioned temperature measuring device, due to the better accuracy, efficiency, and adaptability of the cold bath machine, further improves the precision of temperature control within the outer casing, and ultimately further improves the accuracy of temperature measurement of the sample to be measured.

[0023] In conjunction with the first aspect, the temperature control component may optionally include a fan; the fan is disposed on the inner wall of the inner housing.

[0024] The aforementioned temperature measuring device, by incorporating a fan within the inner shell, further promotes heat circulation within the outer shell, thereby improving the efficiency of temperature regulation within the inner shell. Ultimately, this further enhances the accuracy of temperature measurement for the sample being tested.

[0025] Secondly, this application provides a temperature measurement system, including a controller and a temperature measuring device as described in the first aspect; the controller is electrically connected to a temperature control component, a photoacoustic detection component, a pulsed laser emitter, and a laser emitting component of the temperature measuring device; the controller is configured to: send a temperature control signal to the temperature control component to control the temperature inside the housing; receive a photoacoustic signal emitted by the photoacoustic detection component to determine the temperature of the sample to be measured; send a pulsed laser generation signal to the pulsed laser to cause the pulsed laser emitter to emit pulsed laser; and control the laser emitting component to send a laser generation signal to cause the laser emitting component to emit pulsed laser.

[0026] The temperature measurement system described above has the same beneficial effects as the temperature measurement device provided in the first aspect or any alternative embodiment of the first aspect, which will not be elaborated here. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1A cross-sectional view of a temperature measuring device provided in an embodiment of this application;

[0029] Figure 2 A perspective view of the temperature measuring device provided in the embodiments of this application with its outer casing removed;

[0030] Figure 3 A perspective view of the temperature measuring device provided in an embodiment of this application;

[0031] Figure 4 This is a layout diagram of a temperature measuring device provided in an embodiment of this application.

[0032] Icons: 100, Temperature measuring device; 110, Housing; 120, Temperature control component; 121, Temperature control coil; 132, Temperature controller; 133, Fan; 130, Inner shell; 131, Window; 140, Sample carrier component; 141, Sample carrier; 142, Carrier moving mechanism; 150, Photoacoustic detection component; 151, Photoacoustic detector; 152, Detector moving mechanism; 160, Pulsed laser emitter; 170, Laser emitting component; 200, Controller. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels 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.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] Please refer to Figures 1 to 4 , Figure 1 This is a cross-sectional view of the temperature measuring device 100 provided in an embodiment of this application; Figure 2 This is a perspective view of the temperature measuring device 100 provided in the embodiments of this application with the outer casing 110 removed; Figure 3 This is a perspective view of the temperature measuring device 100 provided in an embodiment of this application; Figure 4This is a layout diagram of the temperature measuring device 100 provided in an embodiment of this application. The temperature measuring device provided in this embodiment may include a housing 110, a temperature control component 120, an inner housing 130, a sample carrying component 140, a photoacoustic detection component 150, a pulsed laser emitter 160, and a laser emitting component 170. The housing 110 may have an accommodating space. The temperature control component 120 may be disposed on the inner wall of the housing 110, and may also be disposed within the inner housing 130. Insulation cotton may be added to the interlayer between the inner housing 130 and the housing 110 to serve as an insulation layer. This can be used to control the temperature within the accommodating space. The inner housing 130 may be located within the accommodating space. The sample carrying component 140 may have a carrying area for carrying the sample to be measured. The sample carrying component 140 may be disposed on the inner bottom wall of the inner housing 130. The photoacoustic detection component 150 and the pulsed laser can be respectively disposed on the inner top wall of the inner shell 130. The pulsed laser can be used to emit pulsed laser light towards the sample to be measured, and the photoacoustic detection component 150 can be used to detect the photoacoustic signal generated by the thermal response of the sample to be measured in the pulsed laser light. A window 131 can be opened on the side wall of the inner shell 130. The laser emitting component 170 can further include an optical fiber, which can be connected to the edge of the window 131, and the laser output end of the laser emitting component 170 can face the bearing area. The laser emitting component 170 can be configured to heat the sample by emitting laser light towards it.

[0040] In other words, the inner shell 130 can be located within the outer shell 110. The inner shell 130 can integrate the sample-carrying component 140, the photoacoustic detection component 150, the pulsed laser emitter 160, and the laser emitting component 170 to form a photoacoustic detection-focusing heating component. Specifically, the temperature control component 120 can be activated before sample temperature calibration to control the temperature within the inner shell 130 and the outer shell 110. Furthermore, during the process of the laser emitting component 170 heating the sample by emitting a laser, the temperature of the sample can be precisely controlled, for example, by appropriately cooling the sample. Therefore, the temperature control component 120 can be a cooling component, such as a cooling pipe with coolant circulating within it.

[0041] The sample to be measured can be an optical phantom of skin tissue or a structure simulating human skin. The laser emitting assembly 170 may include a laser emitter, primarily used to heat the sample by emitting laser light towards it. The pulsed laser emitter 160 is primarily used to emit pulsed laser light towards the sample for imaging and temperature measurement.

[0042] The photoacoustic detection assembly 150 may include a photoacoustic detector 151, which is used to detect the photoacoustic signal generated by the thermal response of the sample to be measured to a pulsed laser.

[0043] The temperature control component 120, inner shell 130, sample carrier component 140, photoacoustic detection component 150, pulsed laser emitter 160 and laser emission component 170 can be connected to an external controller 200 to control them respectively, and to obtain the temperature of the sample to be measured by processing the photoacoustic signal.

[0044] As an optional implementation, the method for measuring the temperature of the sample to be measured may include:

[0045] Step S121: Measure the absorption spectrum of the sample at different temperatures using a spectrophotometer.

[0046] Step S122: Determine the relationship curve between temperature and absorbance based on the absorption spectrum.

[0047] In the above steps, a spectrophotometer can be used as the optical sensor. A spectrophotometer can measure the absorption spectrum of the sample to pulsed laser light. Based on this absorption spectrum, the relationship curve between temperature and absorbance can be determined.

[0048] Step S130: Use the absorption singularity in the relationship curve where the sample temperature is not sensitive to changes in absorbance to correct the error of the test system.

[0049] In step S130 above, the errors include the systematic errors of laser energy stability and temperature control devices, as well as gross measurement errors. Absorption singularities are points where the maximum absorption difference is less than 0.001 abs, and the maximum temperature difference within the temperature range during the calibration test system does not exceed the temperature difference threshold of the test system. During temperature changes, certain absorption points that do not change with temperature (i.e., temperature-insensitive absorption crossovers) can often be found. These crossovers can be used for absorption zeroing correction, for example, the absorption of a 1003.4 nm wavelength laser by water. By removing absorption singularities unaffected by temperature changes and correcting absorbance fluctuations caused by temperature variations, the measurement results can be made more accurate.

[0050] Step S130 may include:

[0051] Step S131: Perform absorption intensity range normalization correction using absorption singularities.

[0052] In step S131 above, for example, at a wavelength of 1003.4 nm, the absorbance of water remains constant within a temperature range of -6°C to 30°C. When measuring the absorbance of a sample within this temperature range, if it is found that the absorbance fluctuates with temperature, the absorbance at 1003.4 nm can be used as a reference point to eliminate these fluctuations, thereby achieving zero-absorption correction.

[0053] Step S132: Correct the energy stability of the laser.

[0054] Step S133: Correct the system error of the temperature control device.

[0055] Step S134: Correct for gross errors in the measurement.

[0056] Step S141:

[0057] By using the correction term for thermal saturation induced by absolute temperature (AT) changes in the photoacoustic domain, the original photoacoustic formula (Grindelwald's formula) is modified, resulting in the photoacoustic dynamic formula in the photoacoustic excitation-absolute temperature variation correction formula and the dynamic correction term introduced by absolute temperature changes; among which,

[0058] The dynamic correction term introduced by the absolute temperature change is:

[0059]

[0060] The revised photoacoustic dynamic correction formula is as follows:

[0061] p0(λ i )=Γ n η th μ a (λ i )F pulse +Δp_AT

[0062] In the formula, Δp_AT is the correction term caused by the absolute temperature change, and λ i It is the wavelength, μ a It is the light absorption coefficient, p0 is the corrected photoacoustic pressure, and F is the light absorption coefficient. pulse τ is the luminous flux of a single pulse, b is a constant that at least characterizes the physical properties of the sample material and the measurement system, and τ is the luminous flux of a single pulse. th It is the thermal relaxation time constant, η th It is the thermal energy conversion efficiency, Γ n Δt is the reference Grindelsen coefficient, and Δt is the time interval between pulses of the pulsed laser.

[0063] The formula for the original Grindelwald parameters is as follows:

[0064]

[0065] Where C is the specific heat capacity, ρ is the density of the substance, which is usually constant for a given substance; β is the coefficient of thermal expansion, which represents the rate of change of the material volume with temperature. It is temperature-dependent and is a value that needs to be compensated for.

[0066] Step S142: Substitute the dynamic correction formula, the light source parameters of the pulsed laser, the normalization coefficients obtained from the singularities, the energy correction parameters of the test system, and the temperature control compensation parameters into the photoacoustic excitation intensity formula to obtain the absorption intensity - photoacoustic excitation intensity calculation formula.

[0067] In step S142 above, the light source parameters of the pulsed laser can be obtained from the factory parameters of the laser emitting component, and the absorption zeroing parameters are obtained from the preceding steps S131 to S134.

[0068] Step S181: Use an image reconstruction algorithm to reconstruct the acoustic wave signal generated during the absorption of pulsed laser by the target to be measured, and obtain a slice of photoacoustic intensity image of the target to be measured.

[0069] In step S181 above, the photoacoustic signal can be reconstructed using the DAS or BP algorithm to obtain a photoacoustic intensity image slice of the object's cross-section. From this slice, it can be seen that the photoacoustic intensity is positively correlated with temperature.

[0070] The specific process of the DAS algorithm can be as follows:

[0071] 1. Acquisition of photoacoustic signals: Collect photoacoustic signals from multiple detectors (sensors).

[0072] 2. Delay correction: The signal is corrected for time delay based on the distance between each detector and each point in the imaging area.

[0073] 3. Signal weighted sum: The signal at each location is weighted and summed (i.e., the signals from all detectors are superimposed after the delay).

[0074] 4. Image reconstruction: The weighted sum is mapped to the image space to obtain the temperature or signal intensity distribution of the imaging area.

[0075] The theoretical formula upon which it is based may be:

[0076]

[0077] In the formula, f i (t delayed ) represents the signal received by the i-th detector, t delayed It is the time calculated based on the propagation time delay.

[0078] Delay t delayed The calculation formula is:

[0079]

[0080] In the formula, r i It is the detector position, r p 'c' represents the location of the imaging point, and 'c' represents the speed of sound.

[0081] The specific process of the BP (Back Projection) image reconstruction algorithm can be as follows:

[0082] 1. Acquisition of photoacoustic signals: Collect photoacoustic signals from multiple detectors.

[0083] 2. Signal projection into image space: The signal from each detector is projected in reverse into the image space, and its contribution to the imaging area is calculated.

[0084] 3. Image accumulation: The results of back-projection from each detector are accumulated to obtain the final image.

[0085] 4. Image reconstruction: The final result is the temperature or signal intensity distribution of each point in the region.

[0086] The theoretical formula upon which this BP algorithm is based is:

[0087]

[0088] In the formula, f i is the photoacoustic signal received by the i-th detector, and ProjectionFactor(i,(x,y)) is the projection factor from detector i to the imaging point (x,y).

[0089] The projection factor (i,(x,y)) can be defined as:

[0090] ProjectionFactor(i,(x,y))=cos(θ i )

[0091] In the formula, θ i It is the angle between the detector and the imaging point.

[0092] Step S182: Determine the region of interest (ROI) of the photoacoustic intensity image slice, and calculate the temperature of the ROI using the absorption intensity-photoacoustic excitation intensity calculation formula to obtain the temperature distribution of the ROI.

[0093] In step S182 above, those skilled in the art can determine the region of interest (ROI) of the photoacoustic intensity image slice according to actual application requirements. After determining the ROI, the temperature of the ROI can be calculated using the previously obtained formula for calculating absorption intensity minus photoacoustic excitation intensity.

[0094] Step S183: Real-time calibration of the propagation rate of the acoustic signal generated by the sample during the absorption of pulsed laser based on the acoustic wave conduction device.

[0095] In step S183 above, a fixed-length component can be used to calibrate the propagation speed of sound wave signals at multiple temperatures to be measured.

[0096] In the above process, a pulsed laser is emitted to the sample to be measured by a pulsed laser emitter 160, and the photoacoustic detection component 150 detects the photoacoustic signal generated by the sample in response to the pulsed laser. Based on the photoacoustic effect, the temperature of the sample is measured, avoiding the invasive operation and limited measurement depth problems that may arise from contact temperature measurement. Since the laser emitted by the laser emitting component 170 can heat the interior of the sample, the temperature distribution of the sample under heating conditions can be obtained by combining it with the photoacoustic temperature measurement component. Furthermore, the internal and external temperature distribution of the sample is necessarily non-uniform, meaning there is always a temperature difference between the inside and outside. Therefore, the internal photoacoustic temperature measurement method can be used to evaluate the safety of laser heaters and the efficacy of laser thermotherapy.

[0097] Please refer to Figure 2 In some alternative implementations, the laser emitting assembly 170 may be sealed to the edge of the window 131.

[0098] The laser emitting assembly 170 may specifically include a laser emitter and a laser focusing head. The laser focusing head can be used to shape the laser emitted by the laser emitter, and a specific optical lens emits laser light with a specific spatial distribution. The laser focusing head can be sealed to the edge of the window 131 via a flange. This sealing connection between the laser focusing head and the edge of the window 131 prevents leakage of coupling agent in the load-bearing area.

[0099] In the above implementation process, the laser emitting component 170 is sealed to the edge of the window 131 to prevent leakage of the coupling agent and other materials installed inside the inner shell 130, thereby ensuring the accuracy of temperature measurement.

[0100] Please refer to Figure 2 In some alternative embodiments, the photoacoustic detection assembly 150 may include a photoacoustic detector 151 and a detector moving mechanism 152. One end of the detector moving mechanism 152 may be connected to the top of the inner housing 130, specifically through, for example... Figure 2 A square mounting bracket at the top of the inner shell 130 is fixed to the top of the inner shell 130. Another connection end of the detector moving mechanism 152 can be connected to the photoacoustic detector 151. The detector moving mechanism 152 can be configured to drive the photoacoustic detector 151 to move in at least two dimensions within the inner shell 130.

[0101] The detector moving mechanism 152 can be a structure known to those skilled in the art, capable of moving the target component in at least two directions. For example, the detector moving mechanism 152 may include a first slider, which is slidably connected to the inner top wall, and the photoacoustic detector 151 may be slidably connected to the first slider. The two slidably connected sliding directions may be perpendicular to each other, and the plane formed by the two slidably connected directions may be perpendicular to the arrangement direction of the inner top wall and the inner bottom wall (that is, it may be equivalent to the vertical direction).

[0102] In the above implementation process, by configuring a detector moving mechanism 152 for the photoacoustic detector 151, the photoacoustic detector 151 is made slidable in at least two directions. This allows the detector position to be finely adjusted during the detection of the photoacoustic signal generated by the photoacoustic detector 151 on the sample to be measured, so as to obtain the optimal detection position and further improve the accuracy of temperature measurement of the sample to be measured.

[0103] Please refer to Figure 2 In some alternative embodiments, the sample carrier assembly 140 may include a sample carrier 141 and a carrier moving mechanism 142. One end of the carrier moving mechanism 142 may be connected to the inner bottom wall, and the other end of the carrier mechanism may be connected to the sample carrier 141. The carrying area may be located on the sample carrier 141. The carrier moving mechanism 142 may be configured to move the sample carrier 141 in at least three dimensions.

[0104] The carrier moving mechanism 142 can also be a structure known to those skilled in the art, capable of enabling the target component to move in at least two directions. For example, the carrier moving mechanism 142 includes a third sliding member and a fourth sliding member. The third sliding member is slidably connected to the inner bottom wall, and the fourth sliding member is slidably connected to the third sliding member. The sample carrier 141 is slidably connected to the fourth sliding member. The sliding directions of these three slidably connected components can be perpendicular to each other, and the plane formed by two of the sliding directions can be perpendicular to the arrangement direction of the inner top wall and the inner bottom wall, while the other sliding direction can be parallel to the arrangement direction of the inner top wall and the inner bottom wall. This enables the sample carrier 141 to move "up and down," "left and right," and "back and forth."

[0105] In the above implementation process, by configuring a carrier moving mechanism 142 on the sample carrier 141, the sample to be measured can be adjusted by the carrier moving mechanism 142 to be closer to the window 131 to reduce heat loss, and also to ensure that the sample to be measured is at the predetermined laser heating position. This further improves the accuracy of temperature measurement of the sample to be measured.

[0106] Please refer to Figure 2In some optional embodiments, the sample carrier 141 may be rotatably connected to the carrier moving mechanism 142. The rotatable plane of the sample carrier 141 is parallel to the orientation of the laser output end of the laser emitting assembly 170 and intersects with the arrangement direction of the inner bottom wall and the inner top wall.

[0107] For example, the rotatable plane of the sample carrier 141 may be parallel to the horizontal plane.

[0108] The rotatable connection between the sample carrier 141 and the carrier moving mechanism 142 can be implemented as follows: the sample carrier 141 is provided with a rotating pin, and the carrier moving mechanism 142 is provided with a pin hole adapted to the rotating pin, and the rotating pin is rotatably disposed in the pin hole.

[0109] In the above implementation process, the rotatable connection between the sample carrier 141 and the carrier moving mechanism 142 allows the sample to be rotated to adjust its position relative to the window 131, thereby further improving the flexibility of the sample carrier assembly 140 and further improving the accuracy of temperature measurement of the sample.

[0110] Please refer to Figure 3 and Figure 4 In some alternative embodiments, the temperature control assembly 120 may include a temperature control coil 121 and a temperature controller 132. The temperature control coil 121 may be fitted to the inner wall of the housing 110. Both ends of the temperature control coil 121 are respectively connected to the temperature controller 132. The temperature controller 132 may be configured to contain a temperature control medium, control the temperature of the temperature control medium, and circulate it within the temperature control coil 121. The temperature control coil 121 may be configured to exchange heat with the air contained in the containment space under the circulation of the temperature control medium.

[0111] Taking the outer casing 110 as an example, the temperature control coil 121 can be attached to three sides of the cuboid. The temperature control coil 121 can be coiled on the inner wall of the outer casing 110.

[0112] The temperature controller 132 can be installed outside the housing 110 and can be connected to the temperature control coil 121 via a pipeline. The circulating temperature control medium can be a coolant such as water. Specifically, the temperature controller 132 can be a cooling device with a cooling function.

[0113] In the above implementation process, by specifically defining the temperature control component 120 as the temperature control coil 121 and the temperature controller 132, and by circulating the temperature control medium between the temperature control coil 121 and the temperature controller 132, the temperature of the inner shell 130 is finely adjusted, thereby further improving the accuracy of measuring the temperature of the sample to be measured.

[0114] Please refer to Figure 3In some alternative implementations, the temperature control coil 121 may be serpentine and conform to the inner wall of the inner shell 130.

[0115] In other words, the temperature control coil 121 can be bent in an S-shape and fit into the inner shell 130.

[0116] In the above process, the temperature control coil 121 is bent in a serpentine shape and attached to the inner wall of the inner shell 130. Compared with spiral attachment and other methods, the temperature control coil 121 can be attached to a larger area on the inner wall of the inner shell 130, thereby further improving the ease of temperature control inside the inner shell 130 and ultimately further improving the accuracy of temperature measurement of the sample to be measured.

[0117] In some alternative implementations, the temperature controller 132 may include a cold bath machine.

[0118] When a cold bath machine is used as the temperature controller 132, the temperature control medium can specifically be ethylene glycol.

[0119] In the above process, the cold bath machine has better accuracy, efficiency and adaptability, which further improves the accuracy of temperature control inside the outer shell 110, and ultimately further improves the accuracy of temperature measurement of the sample to be measured.

[0120] In some alternative implementations, the temperature control assembly 120 may also include a fan 133. The fan 133 may be disposed on the inner wall of the inner housing 130.

[0121] The fan 133 can be installed on the top of the inner housing 1300 or on the side wall of the outer housing 110. In other words, the fan 133 can be installed in an empty space inside the inner housing 130.

[0122] In the above implementation process, by installing a fan 133 inside the inner shell 130, the heat circulation within the inner shell 130 is further promoted, thereby further improving the efficiency of temperature regulation within the inner shell 130. Ultimately, this further improves the accuracy of temperature measurement of the sample to be measured.

[0123] Based on the same concept, embodiments of this application provide a temperature measurement system, which may include a controller 200 and the temperature measuring device 100 described above. The controller 200 is electrically connected to the temperature control component 120, the photoacoustic detection component 150, the pulsed laser emitter 160, and the laser emitting component 170 of the temperature measuring device 100, respectively. The controller 200 may be configured to: send a temperature control signal to the temperature control component 120 to control the temperature inside the housing 110; receive a photoacoustic signal emitted by the photoacoustic detection component 150 to determine the temperature of the sample to be measured; send a pulsed laser generation signal to the pulsed laser emitter 160 to emit a pulsed laser; and control the laser emitting component 170 to send a laser generation signal to emit a pulsed laser.

[0124] The controller 200 mentioned above can specifically be a programmable logic controller 200 (PLC), an embedded microcontroller 200 (such as STM32, Arduino, Raspberry Pi), an FPGA (Field Programmable Gate Array), a dedicated controller 200 (such as CompactRIO), an industrial computer (IPC), or a personal PC, etc.

[0125] The above implementation process can be the same as that of the temperature measuring device 100 described above, and will not be repeated here.

[0126] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A temperature measuring device, characterized in that, Includes an outer shell, temperature control components, inner shell, sample carrier components, photoacoustic detection components, pulsed laser emitter, and laser emission components; The outer shell has a receiving space; The temperature control component is disposed on the inner wall of the outer shell and is used to control the temperature within the accommodating space; The inner shell is located within the accommodating space; The sample carrier component has a carrier area for carrying the sample to be measured in the carrier area; The sample carrier assembly is disposed on the inner bottom wall of the inner shell; The photoacoustic detection component and the pulsed laser emitter are respectively disposed on the inner top wall of the inner shell. The pulsed laser emitter is used to emit pulsed laser to the sample to be measured, and the photoacoustic detection component is used to detect the photoacoustic signal generated by the thermal response of the sample to be measured in the pulsed laser. The inner shell has a window on its side wall, and the laser emitting assembly is located at the edge of the window, with the laser output end of the laser emitting assembly facing the bearing area. The laser emitting component is configured to heat the sample by emitting a laser beam toward the sample.

2. The temperature measuring device according to claim 1, characterized in that, The laser emitting assembly is sealed to the edge of the window.

3. The temperature measuring device according to claim 1, characterized in that, The photoacoustic detection component includes a photoacoustic detector and a detector moving mechanism; One end of the detector moving mechanism is connected to the top of the inner shell, and the other end of the detector moving mechanism is connected to the photoacoustic detector. The detector moving mechanism is configured to drive the photoacoustic detector to move in at least two dimensions within the inner shell.

4. The temperature measuring device according to claim 1, characterized in that, The sample carrying assembly includes a sample carrying component and a carrying component moving mechanism; One end of the carrier moving mechanism is connected to the inner bottom wall, and the other end of the carrier moving mechanism is connected to the sample carrier; The bearing area is located on the sample carrier; The carrier moving mechanism is configured to drive the sample carrier to move in at least three dimensions.

5. The temperature measuring device according to claim 4, characterized in that, The sample carrier is rotatably connected to the carrier moving mechanism; wherein, the rotatable plane of the sample carrier is parallel to the orientation of the laser output end of the laser emitting assembly and intersects with the arrangement direction of the inner bottom wall and the inner top wall.

6. The temperature measuring device according to claim 1, characterized in that, The temperature control component includes a temperature control coil and a temperature control unit; The temperature control coil is attached to the inner wall of the outer casing; The two ends of the temperature control coil are respectively connected to the temperature controller; The temperature controller is configured to contain a temperature control medium, control the temperature of the temperature control medium, and circulate it within the temperature control coil. The temperature control coil is configured to exchange heat with the air contained in the containment space under the circulation of the temperature control medium.

7. The temperature measuring device according to claim 6, characterized in that, The temperature control coil is serpentine and conforms to the inner wall of the inner shell.

8. The temperature measuring device according to claim 6, characterized in that, in, The temperature controller includes a cold bath machine.

9. The temperature measuring device according to claim 6, characterized in that, The temperature control component also includes a fan; The fan is disposed on the inner wall of the inner casing.

10. A temperature measurement system, characterized in that, Includes a controller and a temperature measuring device as described in any one of claims 1 to 9; The controller is electrically connected to the temperature control component, photoacoustic detection component, pulsed laser emitter, and laser emission component of the temperature measuring device, respectively. The controller is configured to: send a temperature control signal to the temperature control component to control the temperature inside the housing; receive a photoacoustic signal emitted by the photoacoustic detection component to determine the temperature of the sample to be measured; send a pulsed laser generation signal to the pulsed laser emitter to cause the pulsed laser emitter to emit pulsed laser; and control the laser emitting component to send a laser generation signal to cause the laser emitting component to emit pulsed laser.

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