Non-contact temperature measurement system based on diamond fluorescence and construction method thereof

Abstract

The invention relates to a non-contact temperature measurement system based on diamond fluorescence and a construction method thereof, the system comprises a single crystal diamond, an ultraviolet laser, a ccd camera and a computer connected with the ccd camera, the temperature measurement system emits a fluorescence picture through the diamond excited by the ultraviolet laser acquired in a non-contact manner, and then the fluorescence picture is calculated and converted into temperature for temperature measurement. A new fluorescent temperature measurement purpose is provided for the single crystal diamond produced at ultra-high temperature and ultra-high pressure, further processing and manufacturing of the color center of the diamond are not needed, and the manufacturing cost and difficulty of a temperature measurement sensor are reduced; the construction method of the system comprises the following steps: according to different fluorescence intensities emitted by a single crystal diamond at different temperatures, establishing a function relationship among a picture, a fluorescence intensity value and the temperature by measuring a relationship between the fluorescence intensity of the diamond used as a sensor and the temperature; or a function relationship among the picture, the fluorescence intensity ratio of different wavelengths and the temperature is established as a software part of the temperature measurement system, so that the temperature measurement system can realize temperature measurement by analyzing and calculating the diamond fluorescence picture.

Description

Technical Field

[0001] The invention relates to the technical field of diamond temperature measurement application, and in particular to a non-contact temperature measurement system based on diamond fluorescence and a construction method thereof. Background Art

[0002] Temperature is one of the most important environmental parameters in nature. Temperature measurement plays a vital role in aerospace, national defense, medical diagnosis, food inspection and other fields. At present, there are mainly contact temperature measurement and non-contact temperature measurement methods. Contact temperature measurement mainly includes mercury thermometers, thermocouple thermometers, thermistor thermometers and other temperature measurement instruments. The design of contact thermometers is simple, reliable and has high temperature measurement accuracy, but the thermometer needs to be in contact with the object being measured, and it cannot measure the temperature of nano-sized materials and temperature-sensitive components; non-contact temperature measurement mainly includes infrared thermometers, infrared temperature imaging cameras, fluorescence temperature measurement technology and other temperature measurement methods. Among them, rare earth materials are the main research object of fluorescence temperature measurement research, but infrared imaging cannot penetrate materials such as plastics, which limits the application places. Rare earth materials are non-renewable, and rare earth materials are easily affected by environmental factors such as humidity and temperature. They cannot adapt to extreme conditions such as strong acid and alkali, high humidity, and strong radiation fields.

[0003] Diamond is suitable for the above-mentioned extreme conditions due to its extremely strong chemical stability, especially diamond containing nitrogen vacancy (NV) color centers, which has been proven to be an excellent material for precision temperature measurement. Color centers are very sensitive to temperature and magnetic fields, which makes diamond unique in the field of temperature measurement. Researchers use diamond NV color centers for temperature measurement, which can be performed under harsh chemical conditions such as strong acids and strong bases. The production of NV color center diamond is a complex process involving multiple steps, and various parameters need to be precisely controlled to obtain the desired color center characteristics. Therefore, the purpose of this application is to propose a method of directly using ultra-high temperature and ultra-high pressure synthesized single crystal diamond for temperature measurement, thereby reducing the difficulty and cost of making diamond as a temperature measuring element. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and to provide a non-contact temperature measurement system based on diamond fluorescence and a construction method thereof.

[0005] The technical solution of the present invention is: a non-contact temperature measurement system based on diamond fluorescence, which at least includes single crystal diamond prepared at ultra-high temperature and ultra-high pressure, an ultraviolet laser, a CCD camera, and a computer connected to the CCD camera, and is characterized by: The laser light emitted by the ultraviolet laser is directed directly at the diamond to stimulate the diamond to emit fluorescence; The CCD camera is facing the diamond and is used to collect pictures of the fluorescence state of the diamond after being irradiated by laser and transmit them to the computer in real time; The computer is provided with a temperature measuring device. The temperature measuring device at least comprises The picture collection and storage module is used to receive the real-time pictures sent by the CCD camera and store them on the computer; Fluorescence intensity analysis module in the picture; used to quantitatively analyze the fluorescence intensity in the picture, The temperature conversion module obtains the corresponding temperature value through the functional relationship between the fluorescence intensity in a certain picture and the diamond temperature; or obtains the corresponding temperature value through the functional relationship between the fluorescence intensity ratio in two pictures of different wavelengths taken at the same time and the diamond temperature; The temperature output module outputs the converted temperature.

[0006] Preferably, the fluorescence intensity analysis module includes an image conversion submodule for converting an RGB image with fluorescence intensity into a grayscale image; and also includes a grayscale value calculation module for quantifying the grayscale value in the grayscale image; The temperature conversion module converts the gray value into temperature according to the functional relationship between the gray value and the temperature; or the temperature conversion module converts the gray value into temperature according to the fluorescence images of different wavelengths taken at the same time. The functional relationship between the gray value ratio and temperature, converting the gray value ratio into temperature, The temperature output module is a screen text display or a voice broadcast.

[0007] Preferably, the system is also provided with an alarm module connected to the computer, which compares the converted temperature value with the set threshold value and sends out an alarm signal, which is an on-site sound or light signal, and the alarm signal is sent to the handheld networked device of the relevant personnel through the network.

[0008] A method for constructing the aforementioned non-contact temperature measurement system based on diamond fluorescence comprises the following steps: a. Prepare a computer, fluorescence detection equipment, CCD camera, temperature-adjustable heating device, and UV laser for emitting UV light to irradiate diamond; connect the CCD camera to the computer; b. Using single crystal diamond as a sensor Using single-crystal diamond produced under ultra-high temperature and ultra-high pressure as a system sensor, the diamond was first verified through its Raman spectrum and X-ray diffraction spectrum; c. Fluorescence detection by UV light excitation Using ultraviolet light to irradiate and excite the diamond selected in step b, and observing the spectrum and emission peak of the fluorescence emitted by the diamond after excitation by a fluorescence detection device; d. Temperature variation characteristics detection The diamond that has completed steps b and c is placed on a temperature-adjustable heating device, and the temperature of the diamond is changed by the heating device. At the same time, an ultraviolet laser emits ultraviolet light with a wavelength of 365nm to irradiate the diamond, and the spectrum of fluorescence emitted by the diamond after being excited at different temperatures is recorded by a fluorescence detection device, and the intensity of fluorescence of a certain wavelength excited by the diamond at different temperatures is recorded at the same time, and different fluorescence intensities corresponding to different temperatures are plotted in a coordinate system and fitted with curves, and the functional relationship between temperature and the intensity of the fluorescence of the wavelength excited is obtained respectively; while the fluorescence detection device is detecting and recording, a CCD camera is used to collect pictures of the luminous state of the diamond of the fluorescence of the wavelength at different temperatures; e. Establishment of functional relationship between image and temperature When there is a positive correlation between the temperature and the fluorescence intensity in step d, an image processing device is established inside the computer to process the images collected in step d, quantify the different fluorescence intensities in different images, and establish a functional relationship between the images and the fluorescence intensity; then, based on the corresponding relationship between the images and the temperature, a functional relationship between the fluorescence intensity and the temperature is established. f. Compile software in the computer to establish a temperature measurement module The temperature measurement module at least includes The picture collection and storage module is used to receive the real-time pictures sent by the CCD camera and store them on the computer; Fluorescence intensity analysis module: according to the functional relationship between the image and the fluorescence intensity in step e, quantitatively analyze the fluorescence intensity in the image, The temperature conversion module converts the fluorescence intensity into temperature through the functional relationship between the fluorescence intensity and the temperature, and obtains the temperature value corresponding to the image; The temperature output module outputs the converted temperature value.

[0009] Preferably, the image processing device established in the computer in step e first converts the RGB images with fluorescence intensity collected at different temperatures in step d into grayscale images, calculates the grayscale value in each image, and establishes a functional relationship between temperature and grayscale value; The fluorescence intensity analysis module in step f includes an image conversion submodule for converting the RGB image of the fluorescence intensity obtained during temperature measurement into a grayscale image; and also includes a grayscale value calculation module for calculating the grayscale value in the grayscale image; The temperature conversion module converts the gray value into temperature according to the functional relationship between the gray value and the temperature. The temperature output module is a screen text display or a voice broadcast.

[0010] Preferably, step d is performed in a vacuum environment, a strong acid environment, or a strong base environment, respectively, to obtain the functional relationship between the temperature and the excitation fluorescence intensity of the diamond in a vacuum environment, the functional relationship between the temperature and the excitation fluorescence intensity in a strong acid environment, and the functional relationship between the temperature and the excitation fluorescence intensity in a strong base environment, respectively.

[0011] Preferably, in step c, when the diamond is excited by ultraviolet light, its excited spectrum has fluorescence peaks at wavelengths of 470nm and 580nm respectively. Replace step d with: The diamond that has completed steps b and c is placed on a temperature-adjustable heating device, and the temperature of the diamond is changed by the heating device. At the same time, the ultraviolet laser emits ultraviolet light with a wavelength of 365nm to irradiate the diamond, and the intensity of the fluorescence of the two wavelengths excited by the diamond at different temperatures is recorded. At the same time, two CCD cameras are used to simultaneously collect pictures of the excited fluorescence intensity of the two wavelengths at different temperatures. Replace step e with: When there is a positive correlation between the temperature and the fluorescence intensity in step d, an image processing device is established inside the computer to process the image collected in step d, quantify the excitation fluorescence intensity images of the two wavelengths collected simultaneously, and calculate the ratio i of the fluorescence intensity of 470nm / the fluorescence intensity of 580nm, and establish a functional relationship between i and temperature; Replace step f with: The temperature measurement module at least includes The picture collection and storage module is used to receive the real-time pictures sent by the two CCD cameras and store them on the computer; Fluorescence intensity analysis module, used to quantify the fluorescence intensity in the image. The temperature conversion module converts the fluorescence intensity into temperature through the functional relationship between the fluorescence intensity ratio i in the two wavelength images taken simultaneously and the temperature, and obtains the temperature value corresponding to the image; The temperature output module outputs the converted temperature value.

[0012] 8. The method for constructing a non-contact temperature measurement system based on diamond fluorescence according to claim 7, characterized in that: In the step e, an image processing device is established inside the computer, which first converts the RGB images with different wavelength fluorescence intensities collected by the two cameras at different temperatures in the step d into grayscale images, calculates the grayscale values ​​in the images, and calculates the ratio i of the grayscale value of the grayscale image of 470nm / the grayscale value of the grayscale image of 580nm, and establishes a functional relationship between i and temperature; The fluorescence intensity analysis module in step f includes an image conversion submodule for converting the RGB images of fluorescence intensities of two different wavelengths, 470nm and 580nm, collected simultaneously by two cameras during temperature measurement into grayscale images; and also includes a grayscale value calculation module for calculating the grayscale value in the grayscale image; The temperature conversion module converts the temperature according to the functional relationship between the ratio i of the grayscale value of the grayscale image at 470nm / the grayscale value of the grayscale image at 580nm and the temperature. The temperature output module is a screen text display or a voice broadcast.

[0013] Preferably, step d is performed in a vacuum environment, a strong acid environment, or a strong base environment, respectively, to obtain the functional relationship between i and temperature of the diamond in a vacuum environment, the functional relationship between i and temperature in a strong acid environment, and the functional relationship between i and temperature in a strong base environment.

[0014] Preferably, the alarm prepared to emit light or sound in step a is connected to a computer, the alarm module of the compiled software in step f communicates with the temperature output module, the alarm module sets a threshold, and determines whether to issue an alarm command based on the temperature value received from the temperature output module, and the alarm command is sent to the alarm through the computer; the ultra-high temperature in step b is 1100°C-3000°C, the ultra-high pressure is 5GPa-10GPa, and the diamond grows for 22-52 hours under this temperature and pressure environment.

[0015] The present invention discloses a non-contact temperature measurement system based on diamond fluorescence and a construction method thereof. The system comprises a single crystal diamond, an ultraviolet laser, a CCD camera, and a computer connected to the CCD camera. The temperature measurement system obtains a fluorescence image of the diamond under ultraviolet laser excitation in a non-contact manner, and then calculates and converts it into temperature to measure the temperature, thereby giving a new use of fluorescence temperature measurement to the single crystal diamond produced at ultrahigh temperature and ultrahigh pressure, and there is no need to further process and manufacture the color center of the diamond, thereby reducing the manufacturing cost and difficulty of the temperature measurement sensor. The construction method of the system is based on the different fluorescence intensities emitted by the single crystal diamond at different temperatures. By measuring the relationship between the fluorescence intensity of the diamond used as a sensor and the temperature, a functional relationship between the image, the fluorescence intensity value, and the temperature is established, or a functional relationship between the image, the ratio of fluorescence intensities of different wavelengths, and the temperature is established as the software part of the temperature measurement system, so that the temperature measurement system can realize temperature measurement by analyzing and calculating the diamond fluorescence image. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 :Schematic diagram of the manufacturing process of ultra-high temperature and ultra-high pressure diamond; Figure 2 : Actual pictures of ultra-high temperature and ultra-high pressure diamond; Figure 3 : Step b verifies the Raman spectrum of diamond; Figure 4 : Step b verifies the XRD pattern of diamond; Figure 5 : Fluorescence spectrum of diamond under 266nm ultraviolet laser in step c; Figure 6 : Fluorescence spectrum of diamond under 365nm ultraviolet laser in step c; Figure 7 : Schematic diagram of the intensity changes of the fluorescence emission peaks at 470nm and 580nm excited by 365nm ultraviolet light at different temperatures; Figure 8 : Excitation fluorescence emission peak intensity value and temperature fitting curve at different temperatures at 470nm; Fig. 9 : The intensity value and temperature fitting curve of the emission peak of the excited fluorescence at 580nm at different temperatures; Fig.10 : Schematic diagram of the functional relationship between the temperature established in step e and the grayscale value of the fluorescent image after conversion; Fig.11 : The fitting function relationship between the 580nm / 470nm fluorescence intensity ratio excited by 365nm ultraviolet light and temperature; Fig.12 : Temperature-dependent 3D spectrum of diamond in a vacuum environment; Fig.13 : The fitting function relationship between the 580nm / 470nm fluorescence intensity ratio and temperature of diamond excited by 365nm ultraviolet light in a vacuum environment; Fig.14 : Variable temperature 3D spectrum of diamond in a strong acid (PH=0) environment; Fig.15 : The relationship between the fluorescence intensity ratio of 580nm / 470nm and the temperature of diamond excited by 365nm ultraviolet light in a strong acid (PH=0) environment; Fig.16 : Temperature-dependent 3D spectrum of diamond in a strong alkaline (PH=14) environment; Fig.17 : The fitting function relationship between the fluorescence intensity ratio of 580nm / 470nm excited by 365nm ultraviolet light and temperature of diamond in a strong alkaline (PH=14) environment; Fig.18 :One of the schematic diagrams of the temperature measurement system; Fig.19 :The second schematic diagram of the temperature measurement system; Figure 18-191. Ultraviolet laser, 2. Single crystal diamond, 3. CCD camera, 4. Computer. DETAILED DESCRIPTION

[0017] Example 1: See Fig.18 A non-contact temperature measurement system based on diamond fluorescence is a single-camera system, which includes at least single-crystal diamond prepared at ultra-high temperature and ultra-high pressure, an ultraviolet laser, a CCD camera, and a computer connected to the CCD camera. An industrial CCD camera can be used to take clear pictures at a fast speed.

[0018] The laser light emitted by the ultraviolet laser is directed directly at the diamond to stimulate the diamond to emit fluorescence; The CCD camera is facing the diamond and is used to collect pictures of the fluorescence state of the diamond after being irradiated by laser and transmit them to the computer in real time; The computer is provided with a temperature measuring device. The temperature measuring device at least comprises The picture collection and storage module is used to receive the real-time pictures sent by the CCD camera and store them on the computer; Fluorescence intensity analysis module in the picture; used to quantitatively analyze the fluorescence intensity in the picture, The temperature conversion module obtains the corresponding temperature value through the functional relationship between the fluorescence intensity and the diamond temperature in a certain image; Fig.18 A single camera system.

[0019] The temperature output module outputs the converted temperature.

[0020] When in use, place the diamond in the environment to be measured, adjust the irradiation direction of the laser machine to accurately excite the diamond after emitting light; adjust the shooting direction and focus of the CCD camera to take clear pictures, add a filter to the CCD camera, and choose to shoot one of the excited fluorescence, either 470nm wavelength or 580nm wavelength.

[0021] The temperature measurement system measures temperature by converting the fluorescence images obtained non-contactly. Single crystal diamond produced under high temperature and high pressure can be used directly for temperature measurement without complicated reprocessing of the diamond. Based on the stability of the diamond itself, it can also solve the temperature measurement problem in some special occasions with harsh environments.

[0022] The fluorescence intensity analysis module includes a picture conversion submodule for converting an RGB picture with fluorescence intensity into a grayscale picture; and also includes a grayscale value calculation module for quantifying the grayscale value in the grayscale picture; the system only provides a submodule for converting the fluorescence intensity in the picture into temperature, and of course does not exclude submodules established by other conversion methods, as long as they can satisfy the conversion between the fluorescence intensity and temperature displayed in the picture.

[0023] The temperature conversion module converts the gray value into temperature according to the functional relationship between the gray value and the temperature; Fig.18 A single camera system.

[0024] The temperature output module is a screen text display or a voice broadcast.

[0025] The system is also equipped with an alarm module connected to the computer. The alarm module compares the calculated temperature value with the set threshold value and sends an alarm signal. The alarm signal is an on-site sound or light signal. At the same time, the alarm signal is sent to the handheld networking device of the relevant personnel through the network. The alarm module is used to transmit the alarm information to alert the temperature measurement personnel or other relevant personnel to deal with the high temperature problem quickly.

[0026] Working process of embodiment 1: Place the diamond at the position to be measured, adjust the CCD camera to align with the diamond, adjust the ultraviolet laser to align with the diamond, the laser emits 365nm laser to excite the diamond, the CCD camera takes a photo of the diamond in the excited fluorescent state, and the CCD camera is equipped with a filter to select a fluorescence to be photographed, and one of the two fluorescences with a wavelength of 470nm or 580nm is selected and transmitted to the computer. The fluorescence intensity analysis module in the computer includes an image conversion submodule, which converts the RGB image with fluorescence intensity into a grayscale image; quantifies the grayscale value in the grayscale image; the temperature conversion module converts the grayscale value into temperature according to the functional relationship between the grayscale value and the temperature; the screen text of the temperature output module displays the temperature, or the temperature is broadcasted by voice. If the alarm threshold is reached, an alarm signal is issued and the relevant responsible personnel are notified through the network.

[0027] Example 2: See Fig.19 , a non-contact temperature measurement system based on diamond fluorescence, is a dual-camera system, which includes at least single crystal diamond prepared at ultra-high temperature and ultra-high pressure, ultraviolet laser, and two CCD cameras. It uses industrial CCD cameras to take clear pictures at a fast speed. The computer connected to the CCD camera, The laser light emitted by the ultraviolet laser is directed directly at the diamond to stimulate the diamond to emit fluorescence; The CCD camera is facing the diamond and is used to collect pictures of the fluorescence state of the diamond after being irradiated by laser and transmit them to the computer in real time; The computer is provided with a temperature measuring device. The temperature measuring device at least comprises The picture collection and storage module is used to receive the real-time pictures sent by the CCD camera and store them on the computer; Fluorescence intensity analysis module in the picture; used to quantitatively analyze the fluorescence intensity in the picture, Temperature conversion module, corresponding to Fig.19 A dual-camera system is used, where two cameras are equipped with filters corresponding to different wavelengths, and the fluorescence intensity images of the excited 470nm wavelength and 580nm wavelength are collected simultaneously; the corresponding temperature value is obtained through the functional relationship between the fluorescence intensity ratio and the diamond temperature in the two images of different wavelengths taken simultaneously; The temperature output module outputs the converted temperature.

[0028] When in use, place the diamond in the environment to be measured, adjust the irradiation direction of the laser machine to accurately excite the diamond after emitting light; adjust the shooting direction and focus of the two CCD cameras to take clear pictures.

[0029] The temperature measurement system measures temperature by converting the fluorescence images obtained non-contactly. Single crystal diamond produced under high temperature and high pressure can be used directly for temperature measurement without complicated reprocessing of the diamond. Based on the stability of the diamond itself, it can also solve the temperature measurement problem in some special occasions with harsh environments.

[0030] The fluorescence intensity analysis module includes a picture conversion submodule for converting an RGB picture with fluorescence intensity into a grayscale picture; and also includes a grayscale value calculation module for quantifying the grayscale value in the grayscale picture; The temperature conversion module converts the grayscale value ratio into temperature according to the functional relationship between the grayscale value ratio of the fluorescence images of different wavelengths taken simultaneously and the temperature. For the dual-camera system, it is the ratio of the grayscale value of the fluorescence intensity image of the 470nm wavelength and the grayscale value of the fluorescence intensity image of the 580nm wavelength collected simultaneously. The system only provides a submodule for converting the fluorescence intensity in the image into temperature. Of course, submodules established by other conversion methods are not excluded, as long as they can satisfy the conversion between the fluorescence intensity ratio of different wavelengths and the temperature.

[0031] The temperature output module is a screen text display or a voice broadcast.

[0032] The system is also equipped with an alarm module connected to the computer. The alarm module compares the calculated temperature value with the set threshold value and sends an alarm signal. The alarm signal is an on-site sound or light signal. At the same time, the alarm signal is sent to the handheld networking device of the relevant personnel through the network. The alarm module is used to transmit the alarm information to alert the temperature measurement personnel or other relevant personnel to deal with the high temperature problem quickly.

[0033] Working process of embodiment 2: The diamond is placed at the position to be measured, two CCD cameras are adjusted to align with the diamond, and the ultraviolet laser is adjusted to align with the diamond. The laser emits 365nm laser to excite the diamond. The two CCD cameras simultaneously take photos of the diamond in the excited fluorescent state. The two cameras are equipped with different filters corresponding to different wavelengths, and the fluorescence intensity pictures of the excited 470nm wavelength and 580nm wavelength are collected simultaneously; and transmitted to the computer. The fluorescence intensity analysis module in the computer includes an image conversion submodule, which converts the RGB picture with fluorescence intensity into a grayscale picture; quantifies the grayscale value in the grayscale picture; the temperature conversion module converts the grayscale value ratio i into temperature according to the functional relationship between the grayscale value ratio i converted from the fluorescent pictures of different wavelengths taken at the same time and the temperature, and the screen text of the temperature output module displays the temperature, or the temperature is broadcasted by voice. If the alarm threshold is reached, an alarm signal is issued and the relevant responsible personnel are notified through the network.

[0034] Example 3: See Figure 1-10 A method for constructing a non-contact temperature measurement system based on diamond fluorescence as described in Example 1 comprises the following steps: a. Prepare a computer, fluorescence detection equipment, CCD camera, temperature-adjustable heating device, and UV laser for emitting UV light to irradiate diamond; connect the CCD camera to the computer; b. Using single crystal diamond as a sensor Using single-crystal diamond produced under ultrahigh temperature and ultrahigh pressure as a system sensor, the diamond is first verified through its Raman spectrum and X-ray diffraction spectrum; Figure 3 The Raman peak was measured at 1332 cm -1 ; like Figure 4 Through X-ray diffraction of diamond, it is confirmed that after X-ray excitation, there will be an obvious peak at 44.1eV, which corresponds to the (111) plane of diamond. The extremely narrow half-peak width indicates that the diamond has good crystallinity. If the quality of diamond is not good, it will not be used and replaced with other diamonds.

[0035] c. Fluorescence detection by UV light excitation The diamond selected in step b is irradiated and excited by ultraviolet light, and the spectrum and emission peak of the fluorescence emitted by the diamond after excitation are observed by fluorescence detection equipment; 266nm ultraviolet laser and 365nm ultraviolet laser are used for irradiation and excitation respectively, and the diamond has fluorescence peaks at 470nm and 580nm respectively, such as Figure 5-6 ; d. Temperature variation characteristics detection The diamond that has completed steps b and c is placed on a temperature-adjustable heating device. The temperature of the diamond is changed by the heating device. At the same time, the ultraviolet laser emits ultraviolet light with a wavelength of 365nm to irradiate the diamond. The fluorescence spectrum emitted by the diamond after excitation at different temperatures is recorded by a fluorescence detection device. After being collected, Figure 7 At the same time, the intensity of the fluorescence of a certain wavelength excited by the diamond at different temperatures is recorded, and the different fluorescence intensities corresponding to different temperatures are plotted in the coordinate system and fitted into a curve, as shown in Figure 8 or Fig. 9 As shown. The functional relationship between temperature and the fluorescence intensity of the excited wavelength is obtained respectively; while the fluorescence detection equipment is detecting and recording, a CCD camera with a filter for one of the fluorescence peak wavelengths is installed to collect images of the diamond luminescence state of 470nm or 580nm wavelength fluorescence at different temperatures; e. Establishment of functional relationship between image and temperature When there is a positive correlation between the temperature and the fluorescence intensity in step d, an image processing device is established inside the computer to process the images collected in step d, quantify the different fluorescence intensities in different images, and establish a functional relationship between the images and the fluorescence intensity; then, based on the corresponding relationship between the images and the temperature, a functional relationship between the fluorescence intensity and the temperature is established. f. Compile software in the computer to establish a temperature measurement module The temperature measurement module at least includes The picture collection and storage module is used to receive the real-time pictures sent by the CCD camera and store them on the computer; Fluorescence intensity analysis module: according to the functional relationship between the image and the fluorescence intensity in step e, quantitatively analyze the fluorescence intensity in the image, The temperature conversion module uses the functional relationship between fluorescence intensity and temperature to Figure 8 Or the functional relationship determined in 9. Convert the fluorescence intensity into temperature to obtain the temperature value corresponding to the image; The temperature output module outputs the converted temperature value.

[0036] In this embodiment, the image processing device established in the computer in step e first converts the RGB images with fluorescence intensity collected at different temperatures in step d into grayscale images, calculates the grayscale value in each image, and establishes a functional relationship between temperature and grayscale value; In this embodiment, the fluorescence intensity analysis module in step f includes an image conversion submodule for converting the RGB image of the fluorescence intensity obtained during temperature measurement into a grayscale image; and also includes a grayscale value calculation module for calculating the grayscale value in the grayscale image; In this embodiment, the temperature conversion module converts the gray value into temperature according to the functional relationship between the gray value and the temperature, and the temperature output module is a screen text display or a voice broadcast.

[0037] In this embodiment, the alarm device prepared to emit light or sound in step a is connected to a computer, the alarm module of the compiled software in step f communicates with the temperature output module, the alarm module sets a threshold, and determines whether to issue an alarm command based on the temperature value received from the temperature output module, and the alarm command is sent to the alarm device through the computer; the ultra-high temperature in step b is 1100°C-3000°C, the ultra-high pressure is 5GPa-10GPa, and the diamond grows for 22-52 hours under this temperature and pressure environment.

[0038] After the above construction method is completed, the non-contact temperature measurement system based on diamond fluorescence described in Example 1 is obtained.

[0039] In order to expand the scope of application and occasions of the system, the step d can be carried out in a vacuum environment, a strong acid environment, or a strong alkali environment, respectively, to obtain the functional relationship between the temperature and the excitation fluorescence intensity of the diamond in a vacuum environment, the functional relationship between the temperature and the excitation fluorescence intensity in a strong acid environment, and the functional relationship between the temperature and the excitation fluorescence intensity in a strong alkali environment, respectively.

[0040] In this way, based on the functional relationship between the temperature and fluorescence intensity of single crystal diamond in different environments as the basis for temperature calculation, the temperature measurement system established in Example 3 can be applied to harsh environments such as vacuum, strong acid or strong alkali, to achieve non-contact temperature measurement in harsh environments.

[0041] Example 4: See Figure 1-9 11. A method for constructing a non-contact temperature measurement system based on diamond fluorescence as described in Embodiment 2 comprises the following steps: A. Prepare a computer, a fluorescence detection device, two CCD cameras, a temperature-adjustable heating device, and an ultraviolet laser for emitting ultraviolet light to irradiate diamond; connect the CCD camera to the computer, and add filters corresponding to different fluorescence wavelengths to the CCD cameras; b. Using single crystal diamond as a sensor Using single-crystal diamond produced under ultrahigh temperature and ultrahigh pressure as a system sensor, the diamond is first verified through its Raman spectrum and X-ray diffraction spectrum; Figure 3 The Raman peak was measured at 1332 cm -1 ; like Figure 4 Through X-ray diffraction of diamond, it is confirmed that after X-ray excitation, there will be an obvious peak at 44.1eV, which corresponds to the (111) plane of diamond. The extremely narrow half-peak width indicates that the diamond has good crystallinity. If the quality of diamond is not good, it will not be used and replaced with other diamonds.

[0042] c. Fluorescence detection by UV light excitation The diamond selected in step b is irradiated and excited by ultraviolet light, and the spectrum and emission peak of the fluorescence emitted by the diamond after excitation are observed by fluorescence detection equipment; 266nm ultraviolet laser and 365nm ultraviolet laser are used for irradiation and excitation respectively, and the diamond has fluorescence peaks at 470nm and 580nm respectively, such as Figure 5-6 ; d. Temperature variation characteristics detection The diamond that has completed steps b and c is placed on a temperature-adjustable heating device, and the temperature of the diamond is changed by the heating device. At the same time, the ultraviolet laser emits ultraviolet light with a wavelength of 365nm to irradiate the diamond, and the intensity of the fluorescence of the two wavelengths excited by the diamond at different temperatures is recorded, such as Figure 7 and Figure 8 , two CCD cameras were used to simultaneously collect images of the excitation fluorescence intensity at two wavelengths of 470nm and 580nm at different temperatures. e. Establishment of functional relationship between image and temperature When there is a positive correlation between temperature and fluorescence intensity in step d, an image processing device is established inside the computer to process the image collected in step d, and the excitation fluorescence intensity images of the two wavelengths collected simultaneously are quantified respectively, and the ratio i of the fluorescence intensity of 470nm / the fluorescence intensity of 580nm is calculated, and a functional relationship between i and temperature is established; the excitation laser, external light, and other interference factors in the image can be denoised by calculating the fluorescence intensity ratio of the two wavelengths, so the functional relationship between the intensity ratio i and the temperature is used as a temperature measurement calculation formula, which has higher accuracy and better stability.

[0043] f. Compile software in the computer to establish a temperature measurement module The temperature measurement module at least includes The picture collection and storage module is used to receive the real-time pictures sent by the two CCD cameras and store them on the computer; Fluorescence intensity analysis module, used to quantify the fluorescence intensity in the image. The temperature conversion module converts the fluorescence intensity into temperature through the functional relationship between the fluorescence intensity ratio i in the two wavelength images of 470nm and 580nm taken simultaneously and the temperature, and obtains the temperature value corresponding to the image.

[0044] The temperature output module outputs the converted temperature value.

[0045] In the step e, an image processing device is established inside the computer. The RGB images with different wavelength fluorescence intensities collected by the two cameras at different temperatures in step d are first converted into grayscale images, and the grayscale values ​​in the images are calculated. The ratio i of the grayscale value of the grayscale image at 470nm / the grayscale value of the grayscale image at 580nm is calculated, and a functional relationship between i and temperature is established, see Fig.11 ; In the fourth embodiment, the fluorescence intensity analysis module in the step f includes an image conversion submodule, which is used to convert the RGB images of fluorescence intensities of two different wavelengths, 470nm and 580nm, collected simultaneously by two cameras during temperature measurement, into grayscale images; it also includes a grayscale value calculation module, which calculates the grayscale value in the grayscale image; the temperature conversion module converts the temperature according to the functional relationship between the ratio i of the grayscale value of the grayscale image of 470nm / the grayscale value of the grayscale image of 580nm and the temperature, and the temperature output module is a screen text display or a voice broadcast.

[0046] After the above construction method is completed, the non-contact temperature measurement system based on diamond fluorescence described in Example 2 is obtained.

[0047] In order to expand the scope and occasions of application of the system, the step d can be carried out in a vacuum environment, a strong acid environment, or a strong base environment, respectively, to obtain the functional relationship between the diamond i and the temperature in the vacuum environment (such as Fig.13 ), the functional relationship between i and temperature in a strong acid environment (such as Fig.15 ), the functional relationship between i and temperature in a strong alkaline environment (such as Fig.17 ). In this way, based on the relationship between the two wavelength fluorescence length ratio i excited by single crystal diamond in different environments and temperature, as the basis for temperature calculation, the temperature measurement system established above can be applied to harsh environments such as vacuum, strong acid or strong alkali, to achieve non-contact temperature measurement in harsh environments.

[0048] In the construction methods of Examples 3 and 4, the following detection equipment will be used in different steps respectively; Model: F-7000 fluorescence spectrophotometer, used for fluorescence intensity detection corresponding to two different wavelengths; Model: Fluorolog-3 scientific-grade fluorescence spectrometer, used for fluorescence intensity detection at two wavelengths at different temperatures; Model: Horiba, Micro Raman Spectroscopy is used to measure Raman spectra in step b.

Claims

1. A non-contact temperature measurement system based on diamond fluorescence, comprising at least single crystal diamond prepared at ultra-high temperature and ultra-high pressure, an ultraviolet laser, a CCD camera, and a computer connected to the CCD camera, characterized in that: The laser light emitted by the ultraviolet laser is directed directly at the diamond to stimulate the diamond to emit fluorescence; The CCD camera is facing the diamond and is used to collect pictures of the fluorescence state of the diamond after being irradiated by laser and transmit them to the computer in real time; The computer is provided with a temperature measuring device. The temperature measuring device at least comprises The picture collection and storage module is used to receive the real-time pictures sent by the CCD camera and store them on the computer; Fluorescence intensity analysis module in the picture; used to quantitatively analyze the fluorescence intensity in the picture, The temperature conversion module obtains the corresponding temperature value through the functional relationship between the fluorescence intensity in a certain picture and the diamond temperature; or obtains the corresponding temperature value through the functional relationship between the fluorescence intensity ratio in two pictures of different wavelengths taken at the same time and the diamond temperature; The temperature output module outputs the converted temperature.

2. The non-contact temperature measurement system based on diamond fluorescence according to claim 1, characterized in that: The fluorescence intensity analysis module includes a picture conversion submodule for converting an RGB picture with fluorescence intensity into a grayscale picture; and also includes a grayscale value calculation module for quantifying the grayscale value in the grayscale picture; The temperature conversion module converts the gray value into temperature according to the functional relationship between the gray value and the temperature; or the temperature conversion module converts the gray value into temperature according to the fluorescence images of different wavelengths taken at the same time. The functional relationship between the gray value ratio and temperature, converting the gray value ratio into temperature, The temperature output module is a screen text display or a voice broadcast.

3. The non-contact temperature measurement system based on diamond fluorescence according to claim 1, characterized in that: The system is also provided with an alarm module connected to the computer, which compares the calculated temperature value with the set threshold and sends out an alarm signal, which is an on-site sound or light signal. At the same time, the alarm signal is sent to the handheld networked device of the relevant personnel through the network.

4. A method for constructing a non-contact temperature measurement system based on diamond fluorescence as claimed in claim 1, comprising the following steps: a. Prepare a computer, fluorescence detection equipment, CCD camera, temperature-adjustable heating device, and UV laser for emitting UV light to irradiate diamond; connect the CCD camera to the computer; b. Using single crystal diamond as a sensor Using single-crystal diamond produced under ultra-high temperature and ultra-high pressure as a system sensor, the diamond was first verified through its Raman spectrum and X-ray diffraction spectrum; c. Fluorescence detection by UV light excitation Using ultraviolet light to irradiate and excite the diamond selected in step b, and observing the spectrum and emission peak of the fluorescence emitted by the diamond after excitation by a fluorescence detection device; d. Temperature variation characteristics detection The diamond that has completed steps b and c is placed on a temperature-adjustable heating device, and the temperature of the diamond is changed by the heating device. At the same time, an ultraviolet laser emits ultraviolet light with a wavelength of 365nm to irradiate the diamond, and the spectrum of fluorescence emitted by the diamond after being excited at different temperatures is recorded by a fluorescence detection device, and the intensity of fluorescence of a certain wavelength excited by the diamond at different temperatures is recorded at the same time, and different fluorescence intensities corresponding to different temperatures are plotted in a coordinate system and fitted with curves, and the functional relationship between temperature and the intensity of the fluorescence of the wavelength excited is obtained respectively; while the fluorescence detection device is detecting and recording, a CCD camera is used to collect pictures of the luminous state of the diamond of the fluorescence of the wavelength at different temperatures; e. Establishment of functional relationship between image and temperature When there is a positive correlation between the temperature and the fluorescence intensity in step d, an image processing device is established inside the computer to process the images collected in step d, quantify the different fluorescence intensities in different images, and establish a functional relationship between the images and the fluorescence intensity; then, based on the corresponding relationship between the images and the temperature, a functional relationship between the fluorescence intensity and the temperature is established. f. Compile software in the computer to establish a temperature measurement module The temperature measurement module at least includes The picture collection and storage module is used to receive the real-time pictures sent by the CCD camera and store them on the computer; Fluorescence intensity analysis module: according to the functional relationship between the image and the fluorescence intensity in step e, quantitatively analyze the fluorescence intensity in the image, The temperature conversion module converts the fluorescence intensity into temperature through the functional relationship between the fluorescence intensity and the temperature, and obtains the temperature value corresponding to the image; The temperature output module outputs the converted temperature value.

5. The method for constructing a non-contact temperature measurement system based on diamond fluorescence according to claim 4, characterized in that: The image processing device established in the computer in step e first converts the RGB images with fluorescence intensity collected at different temperatures in step d into grayscale images, calculates the grayscale value in each image, and establishes a functional relationship between temperature and grayscale value; The fluorescence intensity analysis module in step f includes an image conversion submodule for converting the RGB image of the fluorescence intensity obtained during temperature measurement into a grayscale image; and also includes a grayscale value calculation module for calculating the grayscale value in the grayscale image; The temperature conversion module converts the gray value into temperature according to the functional relationship between the gray value and the temperature. The temperature output module is a screen text display or a voice broadcast.

6. The method for constructing a non-contact temperature measurement system based on diamond fluorescence according to claim 4, characterized in that: The step d shown is performed in a vacuum environment, a strong acid environment, or a strong base environment, respectively, to obtain the functional relationship between the temperature and the excitation fluorescence intensity of the diamond in a vacuum environment, the functional relationship between the temperature and the excitation fluorescence intensity in a strong acid environment, and the functional relationship between the temperature and the excitation fluorescence intensity in a strong base environment, respectively.

7. The method for constructing a non-contact temperature measurement system based on diamond fluorescence according to claim 4, characterized in that: In step c, when the diamond is excited by ultraviolet light, its excited spectrum has fluorescence peaks at wavelengths of 470nm and 580nm respectively. Replace step d with: The diamond that has completed steps b and c is placed on a temperature-adjustable heating device, and the temperature of the diamond is changed by the heating device. At the same time, the ultraviolet laser emits ultraviolet light with a wavelength of 365nm to irradiate the diamond, and the intensity of the fluorescence of the two wavelengths excited by the diamond at different temperatures is recorded. At the same time, two CCD cameras are used to simultaneously collect pictures of the excited fluorescence intensity of the two wavelengths at different temperatures. Replace step e with: When there is a positive correlation between the temperature and the fluorescence intensity in step d, an image processing device is established inside the computer to process the image collected in step d, quantify the excitation fluorescence intensity images of the two wavelengths collected simultaneously, and calculate the ratio i of the fluorescence intensity of 470nm / the fluorescence intensity of 580nm, and establish a functional relationship between i and temperature; Replace step f with: The temperature measurement module at least includes The picture collection and storage module is used to receive the real-time pictures sent by the two CCD cameras and store them on the computer; Fluorescence intensity analysis module, used to quantify the fluorescence intensity in the image. The temperature conversion module converts the fluorescence intensity into temperature through the functional relationship between the fluorescence intensity ratio i in the two wavelength images taken simultaneously and the temperature, and obtains the temperature value corresponding to the image; The temperature output module outputs the converted temperature value.

8. The method for constructing a non-contact temperature measurement system based on diamond fluorescence according to claim 7, characterized in that: In the step e, an image processing device is established inside the computer, which first converts the RGB images with different wavelength fluorescence intensities collected by the two cameras at different temperatures in the step d into grayscale images, calculates the grayscale values ​​in the images, and calculates the ratio i of the grayscale value of the grayscale image of 470nm / the grayscale value of the grayscale image of 580nm, and establishes a functional relationship between i and temperature; The fluorescence intensity analysis module in step f includes an image conversion submodule for converting the RGB images of fluorescence intensities of two different wavelengths, 470nm and 580nm, collected simultaneously by two cameras during temperature measurement into grayscale images; and also includes a grayscale value calculation module for calculating the grayscale value in the grayscale image; The temperature conversion module converts the temperature according to the functional relationship between the ratio i of the grayscale value of the grayscale image at 470nm / the grayscale value of the grayscale image at 580nm and the temperature. The temperature output module is a screen text display or a voice broadcast.

9. The method for constructing a non-contact temperature measurement system based on diamond fluorescence according to claim 7, characterized in that: The step d shown is performed in a vacuum environment, a strong acid environment, or a strong base environment, respectively, to obtain the functional relationship between i and temperature of the diamond in a vacuum environment, the functional relationship between i and temperature in a strong acid environment, and the functional relationship between i and temperature in a strong base environment.

10. The method for constructing a non-contact temperature measurement system based on diamond fluorescence according to claim 4 or 7, characterized in that: The alarm device that is prepared to emit light or sound in step a is connected to a computer, the alarm module of the compiled software in step f communicates with the temperature output module, the alarm module sets a threshold, and determines whether to issue an alarm command based on the temperature value received from the temperature output module, and the alarm command is sent to the alarm device through the computer; the ultra-high temperature in step b is 1100°C-3000°C, the ultra-high pressure is 5GPa-10GPa, and the diamond grows for 22-52 hours under this temperature and pressure environment.

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