Temperature measuring device and system

Abstract

The invention discloses a temperature measuring device and system. The device comprises an outer shell, a temperature control assembly, an inner shell, a sample bearing assembly, a photoacoustic detection assembly, a pulse laser transmitter and a laser transmitting assembly, the shell has an accommodating space; the temperature control assembly is arranged on the inner wall of the shell and used for controlling the temperature in the containing space. The inner shell is positioned in the accommodating space; the sample bearing assembly has a bearing area and is used for bearing a sample to be subjected to temperature measurement 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 pulse laser are arranged on the inner top wall of the inner shell, the pulse laser is used for emitting pulse laser to a sample to be subjected to temperature measurement, and the photoacoustic detection assembly is used for detecting a photoacoustic signal generated by the sample to be subjected to temperature measurement in thermal response to the pulse laser; a window is formed in the side wall of the inner shell, the laser emitting assembly is arranged on the edge of the window, and the laser output end of the laser emitting assembly faces the bearing area. The laser emitting assembly is configured to emit laser to a sample so as to heat the sample. According to the device, the pulse laser is transmitted to the sample to be subjected to temperature measurement through the pulse laser transmitter, and the temperature of the heated sample to be subjected to temperature measurement is measured in real time based on the photoacoustic effect, so that the accuracy of measuring the temperature of the sample to be subjected to temperature measurement is improved.

Description

Technical Field

[0001] The present application relates to the field of temperature measurement technology, and in particular to a temperature measurement device and system. Background Art

[0002] Existing temperature measurement technologies primarily include contact temperature measurement, infrared temperature measurement, and acoustic temperature measurement. Ultrasonic temperature measurement is non-contact and can measure tissue structure, but it cannot measure temperature. Ultrasonic waves also have limited accuracy and cannot meet the control requirements of laser and focused closed-loop hyperthermia. Fiber optic temperature sensors can measure internal temperatures with high accuracy, but this method is invasive, requires the insertion of optical fibers, which may interfere with the laser treatment process, and has low spatial resolution. While acoustic temperature measurement can obtain deep-seated temperature information to a certain extent, its accuracy is often low and is easily affected by the characteristics of the medium.

[0003] In particular, real-time acquisition of the temperature distribution 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 measurement accuracy of current temperature measurement technology needs to be improved. Summary of the Invention

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

[0006] In the first aspect, the present application provides a temperature measuring device, comprising an outer shell, a temperature control component, an inner shell, a sample carrying component, a photoacoustic detection component, a pulsed laser emitter and a laser emitting component; the outer shell has a containing space; the temperature control component is arranged on the inner wall of the outer shell, for controlling the temperature in the containing space; the inner shell is located in the containing space; the sample carrying component has a carrying area, for carrying the sample to be measured in the carrying area; the sample carrying component is arranged on the inner bottom wall of the inner shell; the photoacoustic detection component and the pulsed laser are respectively arranged on the inner top wall of the inner shell, the pulsed laser 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 to the pulsed laser; a window is opened on the side wall of the inner shell, the laser emitting component is arranged 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 to the sample.

[0007] The temperature measurement device described above uses a pulsed laser emitter to emit pulsed laser light toward the sample to be measured. A photoacoustic detection component detects the photoacoustic signal generated by the sample in response to the pulsed laser light. Based on the photoacoustic effect, the temperature of the sample to be measured is measured, avoiding the invasive procedures and limited measurement depth that may be associated with contact-based temperature measurement. Because the laser energy emitted by the laser emission component can heat the interior of the sample to be measured, the temperature distribution of the sample under heating conditions can be obtained. Furthermore, the internal and external temperature distribution of the sample to be measured is inherently non-uniform, meaning there must be a temperature difference between the inside and the outside. Therefore, internal photoacoustic temperature measurement methods can be used to evaluate the safety of laser heaters and the efficacy of laser thermotherapy.

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

[0009] The temperature measuring device is sealed to the edge of the window through the laser emitting assembly, thereby preventing the coupling agent and the like provided inside the inner shell from leaking, thereby ensuring the accuracy of the temperature measurement.

[0010] In combination with the first aspect, optionally, the photoacoustic detection assembly includes a photoacoustic detector and a detector moving mechanism; one connecting end of the detector moving mechanism is connected to the top of the inner shell, and the other connecting 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 above-mentioned temperature measuring device realizes the sliding of the photoacoustic detector in at least two directions by configuring a detector moving mechanism for the photoacoustic detector, so that during the process of the photoacoustic detector detecting the photoacoustic signal generated by the sample to be measured, the detection position can be fine-tuned to obtain the optimal detection position, thereby further improving the accuracy of measuring the temperature of the sample to be measured.

[0012] Referring to the figures, in some optional embodiments, the sample carrier assembly may include a sample carrier and a carrier movement mechanism. One connection end of the carrier movement mechanism may be connected to the inner bottom wall, and another connection end of the carrier mechanism may be connected to the sample carrier. The loading area may be located on the sample carrier. The carrier movement mechanism may be configured to move the sample carrier in at least three dimensions.

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

[0014] The temperature measurement device, by equipping the sample carrier with a carrier movement mechanism, allows the sample to be moved closer to the window to reduce heat loss and ensures that the sample is positioned at the predetermined laser heating position. This further improves the accuracy of the sample temperature measurement.

[0015] In combination with the first aspect, optionally, the sample carrier is rotatably connected to the carrier moving mechanism; wherein, the rotatable plane of the sample carrier is parallel to the direction 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 above-mentioned temperature measuring device, through the rotatable connection between the sample carrier and the carrier moving mechanism, allows the sample to be measured to adjust its position facing the window by rotation, thereby further improving the flexibility of the sample carrier assembly and further improving the accuracy of measuring the temperature of the sample to be measured.

[0017] In combination with the first aspect, optionally, the temperature control component includes a temperature control coil and a temperature control machine; the temperature control coil is attached to the inner wall of the outer shell; the two ends of the temperature control coil are respectively connected to the temperature control machine; the temperature control machine is configured to accommodate a temperature control medium, control the temperature of the temperature control medium and circulate it in the temperature control coil; the temperature control coil is configured to exchange heat with the air contained in the containing space under the circulation action of the temperature control medium.

[0018] The above-mentioned temperature measuring device further improves the accuracy of measuring the temperature of the sample to be measured by fine-tuning the temperature inside the inner shell by specifically determining the temperature control components as a temperature control coil and a temperature control machine and circulating a temperature control medium between the temperature control coil and the temperature control machine.

[0019] In combination with the first aspect, optionally, the temperature control coil is bent in a serpentine shape and fits against the inner wall of the inner shell.

[0020] The above-mentioned temperature measuring device is adapted to fit the inner wall of the inner shell in a serpentine-shaped bending shape of the temperature control coil. Compared with spiral fitting and other methods, the temperature control coil can fit over a larger area on the inner wall of the inner shell, thereby further improving the ease of temperature control inside the inner shell and ultimately further improving the accuracy of measuring the temperature of the sample to be measured.

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

[0022] The temperature measuring device further improves the accuracy of temperature control inside the housing due to the better accuracy, efficiency and adaptability of the cold bath machine, and ultimately further improves the accuracy of measuring the temperature of the sample to be measured.

[0023] In combination with the first aspect, optionally, the temperature control component further includes a fan; the fan is arranged on the inner wall of the inner shell.

[0024] The temperature measuring device further promotes heat circulation in the outer shell by arranging a fan in the inner shell, thereby further improving the efficiency of regulating the temperature in the inner shell, and ultimately further improving the accuracy of measuring the temperature of the sample to be measured.

[0025] In a second aspect, the present application provides a temperature measurement system, comprising 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, 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 a sample to be measured; send a pulsed laser generation signal to the pulsed laser to enable the pulsed laser emitter to emit a pulsed laser; and control the laser emitting component to send a laser generation signal to enable the laser emitting component to emit a pulsed laser.

[0026] The above-mentioned temperature measurement system has the same beneficial effects as the temperature measurement device provided in the above-mentioned first aspect, or any optional implementation manner of the first aspect, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

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

[0029] Figure 2 A three-dimensional diagram of the temperature measuring device provided in an embodiment of the present application with the outer shell removed;

[0030] Figure 3 A three-dimensional diagram of a temperature measuring device provided in an embodiment of the present application;

[0031] Figure 4 This is a layout diagram of the temperature measurement device provided in an embodiment of the present application.

[0032] Icons: 100, temperature measuring device; 110, outer shell; 120, temperature control component; 121, temperature control coil; 132, temperature controller; 133, fan; 130, inner shell; 131, window; 140, sample carrying component; 141, sample carrying member; 142, carrying member moving mechanism; 150, photoacoustic detection component; 151, photoacoustic detector; 152, detector moving mechanism; 160, pulsed laser emitter; 170, laser emission component; 200, controller. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, the terms "first," "second," "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 necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it 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 rather that it can be slightly tilted.

[0038] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

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

[0040] That is to say, the inner shell 130 can be located inside the outer shell 110, and the inner shell 130 can integrate the sample holding 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. The temperature control component 120 can be started before the sample temperature is calibrated to control the temperature inside the inner shell 130 and the outer shell 110. In the process of the laser emitting component 170 emitting a laser to the sample to be measured and heating it, the temperature of the sample to be measured can also be precisely controlled, for example, the sample to be measured can be appropriately cooled. Therefore, the temperature control component 120 can be a cooling component, for example, a cooling pipe with a coolant circulating therein.

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

[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 the pulsed laser.

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

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

[0045] Step S121: using a spectrophotometer to measure the absorption spectra of the sample at different temperatures.

[0046] Step S122: determining a relationship curve between temperature and absorbance according to the absorption spectrum.

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

[0048] Step S130: using the absorption singular point in the relationship curve where the sample temperature is insensitive to the absorbance change, to correct the error of the test system.

[0049] In the above step S130, the error includes the systematic error of the laser energy stability and the temperature control device, as well as the gross error of the measurement; the absorption singular point is the point where the maximum absorption difference is less than 0.001abs, and the maximum temperature difference in the temperature range during the calibration test system does not exceed the temperature difference threshold of the test system. During the temperature change process, it is usually found that some absorption points do not change with temperature changes (i.e., temperature-insensitive absorption intersections), and these intersections can be used to perform absorption zero correction, for example: the absorption of water by a laser with a wavelength of 1003.4nm. By removing the absorption singular points that are not affected by temperature changes and correcting the absorbance fluctuations caused by temperature changes, the measurement results can be made more accurate.

[0050] Step S130 may include:

[0051] Step S131: performing normalization correction on the absorption intensity range using the absorption singular point.

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

[0053] Step S132: calibrate the laser energy stability.

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

[0055] Step S134: Correcting gross measurement errors.

[0056] Step S141:

[0057] The original photoacoustic equation (Grüneison's formula) is corrected by using the correction term of thermal saturation caused by absolute temperature (AT) changes in the photoacoustic field, and the photoacoustic dynamic equation and the dynamic correction term introduced by absolute temperature changes in the photoacoustic excitation-absolute temperature change correction formula are obtained; among them,

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

[0059]

[0060] The corrected photoacoustic dynamic correction formula is:

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

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

[0063] The formula of the original Grüneison parameter is as follows:

[0064]

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

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

[0067] In the above step S142, 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 previous steps S131 to S134.

[0068] Step S181: using an image reconstruction algorithm to reconstruct an image of the acoustic wave signal generated when the temperature target absorbs the pulsed laser, and obtaining a photoacoustic intensity image slice of the temperature target.

[0069] In the above step S181, the DAS or BP algorithm can be used to reconstruct the photoacoustic signal to obtain a photoacoustic intensity image slice of the object section, from which it can be seen that the photoacoustic intensity is positively correlated with the temperature.

[0070] Among them, regarding the DAS algorithm, its specific process can be:

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

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

[0073] 3. Signal weighted sum: Perform weighted sum of the signal at each location (i.e., the signals of all detectors are superimposed after delay).

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

[0075] The theoretical formula on which it is based can be:

[0076]

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

[0078] Delay t delayed The calculation formula is:

[0079]

[0080] Where r i is the detector position, r p is the imaging point position, and c is the speed of sound.

[0081] Regarding the BP (Back Projection) image reconstruction algorithm, its specific process can be:

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

[0083] 2. Signal projection into image space: The signal of each detector is back-projected into the image space to calculate its contribution to the imaging area.

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

[0085] 4. Image reconstruction: Finally, the temperature or signal intensity distribution of each point in the area is obtained.

[0086] The theoretical formula on which the BP algorithm is based is:

[0087]

[0088] Where, 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 ProjectionFactor(i,(x,y)) can be defined as:

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

[0091] Where θ i is the angle between the detector and the imaging point.

[0092] Step S182: determining a region of interest of the photoacoustic intensity image slice, and calculating the temperature of the region of interest using the absorption intensity-photoacoustic excitation intensity calculation formula to obtain the temperature distribution of the region of interest.

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

[0094] Step S183: real-time correction of the propagation velocity of the acoustic wave signal generated by the sample during the absorption of the pulsed laser by the acoustic wave conductor.

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

[0096] During the above implementation process, a pulsed laser is emitted toward 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 to be measured in response to the pulsed laser. Based on the photoacoustic effect, the temperature of the sample to be measured is measured, avoiding the invasive operation and limited measurement depth that may be caused by contact temperature measurement. Since the laser energy emitted by the laser emission component 170 can heat the interior of the sample to be measured, the temperature distribution of the sample to be measured under heating conditions can be obtained in combination with the photoacoustic temperature measurement component. The internal and external temperature distribution of the sample to be measured is definitely uneven, that is, there must be a temperature difference between the inside and the 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 optional embodiments, the laser emitting assembly 170 can be sealed to the edge of the window 131.

[0098] Laser emitting assembly 170 specifically includes a laser emitter and a laser focusing head. The laser focusing head can be used to shape the laser light emitted by the laser emitter, and a specific optical lens can emit laser light with a specific spatial distribution. The laser focusing head can be sealed to the edge of window 131 via a flange. The sealed connection between the laser focusing head and the edge of window 131 can prevent leakage of coupling agent in the bearing area.

[0099] In the above implementation process, the laser emitting assembly 170 is sealed to the edge of the window 131 to prevent the coupling agent and the like provided inside the inner shell 130 from leaking, thereby ensuring the accuracy of the temperature measurement.

[0100] Please refer to Figure 2 In some optional embodiments, the photoacoustic detection assembly 150 may include a photoacoustic detector 151 and a detector moving mechanism 152. One connection end of the detector moving mechanism 152 may be connected to the top of the inner shell 130, specifically by Figure 2 The square fixing frame at the top is fixed to the top of the inner shell 130, and the other 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 movement mechanism 152 can be a structure known to those skilled in the art that can achieve movement of the target component in at least two directions. For example, the detector movement mechanism 152 can include a first slider that is slidably connected to the inner top wall, and the photoacoustic detector 151 can be slidably connected to the first slider. The sliding directions of the two slidable connections can be perpendicular to each other, and the plane formed by the two sliding directions can be perpendicular to the arrangement direction of the inner top wall and the inner bottom wall (that is, can be equivalent to the vertical direction).

[0102] During the above implementation process, by configuring a detector moving mechanism 152 for the photoacoustic detector 151, the photoacoustic detector 151 can be slidable in at least two directions, so that in the process of the photoacoustic detector 151 detecting the photoacoustic signal generated by the sample to be measured, the detection position can be fine-tuned to obtain the optimal detection position, thereby further improving the accuracy of measuring the temperature of the sample to be measured.

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

[0104] The carrier moving mechanism 142 can also be a structure known to those skilled in the art that can achieve movement of the target component in at least two directions. For example, the carrier moving mechanism 142 includes a third slider and a fourth slider, the third slider is slidably connected to the inner bottom wall, the fourth slider is slidably connected to the third slider, and the sample carrier 141 is slidably connected to the fourth slider. The sliding directions of these three slidable connections 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, and 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 "forward and backward".

[0105] In the above implementation, by configuring the sample carrier 141 with a carrier moving mechanism 142, the sample to be measured can be adjusted by the carrier moving mechanism 142 to be closer to the window 131, thereby reducing heat loss and ensuring that the sample to be measured is located at the predetermined laser heating position. This further improves the accuracy of the 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 direction 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] Illustratively, the rotatable plane of 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 specifically implemented as follows: a rotating pin is provided on the sample carrier 141, and a pin hole adapted to the rotating pin is provided on the carrier moving mechanism 142, and the rotating pin can be rotatably provided in the pin hole.

[0109] During the above implementation process, the rotatable connection between the sample carrier 141 and the carrier moving mechanism 142 allows the sample to be measured to adjust its position opposite the window 131 by rotation, thereby further improving the flexibility of the sample carrier assembly 140 and further improving the accuracy of measuring the temperature of the sample to be measured.

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

[0111] Taking the case where the housing 110 is in a rectangular parallelepiped shape as an example, the temperature control coil 121 can be arranged on three sides of the rectangular parallelepiped. The temperature control coil 121 can be arranged spirally on the inner wall of the housing 110.

[0112] The temperature controller 132 can be disposed 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. The temperature controller 132 can specifically be a cooling device with a temperature reduction function.

[0113] During the above implementation process, the temperature control component 120 is specifically determined to be a temperature control coil 121 and a temperature control machine 132, and the temperature control medium is circulated between the temperature control coil 121 and the temperature control machine 132 to fine-tune the temperature of the inner shell 130, thereby further improving the accuracy of measuring the temperature of the sample to be measured.

[0114] Please refer to Figure 3In some optional embodiments, the temperature control coil 121 can be bent in a serpentine shape and fit the inner wall of the inner shell 130.

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

[0116] During the above implementation process, the temperature control coil 121 is bent in a serpentine shape and fitted to the inner wall of the inner shell 130. Compared with spiral fitting and other methods, the temperature control coil 121 can be fitted to a larger area of 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 measuring the temperature of the sample to be measured.

[0117] In some optional embodiments, the temperature control machine 132 may include a cold bath.

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

[0119] In the above implementation process, since the cold bath has better accuracy, efficiency and adaptability, the accuracy of temperature control in the housing 110 is further improved, and ultimately the accuracy of measuring the temperature of the sample to be measured is further improved.

[0120] In some optional embodiments, the temperature control assembly 120 may further include a fan 133 . The fan 133 may be disposed on the inner wall of the inner shell 130 .

[0121] The fan 133 may be disposed on the top of the inner housing 1300 , or on the sidewall of the outer housing 110 , etc. In other words, the fan 133 may be disposed in an idle position within the inner housing 130 .

[0122] In the above implementation process, by providing the fan 133 in the inner shell 130, the heat circulation in the inner shell 130 is further promoted, thereby further improving the efficiency of regulating the temperature in the inner shell 130. Finally, the accuracy of measuring the temperature of the sample to be measured is further improved.

[0123] Based on the same concept, an embodiment of the present application provides a temperature measurement system, which may include a controller 200 and the temperature measurement 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 emission component 170 of the temperature measurement device 100, respectively. The controller 200 can be configured to: send a temperature control signal to the temperature control component 120 to control the temperature inside the housing 110. Receive the 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 so that the pulsed laser emitter 160 emits a pulsed laser. And control the laser emission component 170 to send a laser generation signal so that the laser emission component 170 emits a pulsed laser.

[0124] The above-mentioned controller 200 can specifically be a programmable logic controller 200 (PLC), an embedded microcontroller 200 (such as STM32, Arduino, RaspberryPi), 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 may be the same as that of the temperature measuring device 100 described above, and will not be described again here.

[0126] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A temperature measuring device, characterized in that: It includes an outer shell, a temperature control component, an inner shell, a sample carrying component, a photoacoustic detection component, a pulsed laser emitter and a laser emission component; The housing has a receiving space; The temperature control component is arranged on the inner wall of the shell and is used to control the temperature in the accommodation space; The inner shell is located in the accommodating space; The sample carrying assembly has a carrying area for carrying the sample to be temperature measured in the carrying area; The sample carrying assembly is arranged on the inner bottom wall of the inner shell; The photoacoustic detection assembly and the pulse laser are respectively arranged on the inner top wall of the inner shell, the pulse laser is used to emit pulse laser to the sample to be measured, and the photoacoustic detection assembly is used to detect the photoacoustic signal generated by the thermal response of the sample to be measured to the pulse laser; A window is formed on the side wall of the inner shell, the laser emitting assembly is arranged at the edge of the window, and the laser output end of the laser emitting assembly faces the bearing area; The laser emitting assembly is configured to heat the sample by emitting laser light 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 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.

4. The temperature measuring device according to claim 1, characterized in that The sample carrying assembly includes a sample carrying member and a carrying member moving mechanism; One connection end of the carrier moving mechanism is connected to the inner bottom wall, and the other connection 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.

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 direction 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 machine; The temperature control coil is attached to the inner wall of the shell; Both ends of the temperature control coil are respectively connected to the temperature control machine; The temperature control machine is configured to accommodate 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 perform heat exchange with the air contained in the containing space under the circulation action of the temperature control medium.

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

8. The temperature measuring device according to claim 6, characterized in that: in, The temperature control machine 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 arranged on the inner wall of the inner shell.

10. A temperature measurement system, characterized in that: A device comprising a controller and a temperature measuring device according to any one of claims 1 to 9; The controller is electrically connected to the temperature control component, the photoacoustic detection component, the pulse laser emitter and the 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 from the photoacoustic detection component to determine the temperature of the sample to be measured; A pulse laser generating signal is sent to the pulse laser so that the pulse laser emitter emits a pulse laser; and a laser emitting component is controlled to send a laser generating signal so that the laser emitting component emits a pulse laser.

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