A temperature calibration method, storage medium and related device based on a thermopile

Abstract

The present application relates to a temperature calibration method, storage medium and related device based on a thermopile, and relates to the field of temperature calibration. Among them, the method includes: obtaining a target thermopile digital quantity and a target NTC digital quantity, calculating the target ambient temperature from the target NTC digital quantity, and substituting the target thermopile digital quantity into the temperature calculation formula within the corresponding target ambient temperature range to obtain the measured temperature of the object to be measured. By fitting the functional relationship between the thermopile digital quantity and the measured temperature within the ambient temperature range through the temperature calculation formula, after obtaining the thermopile digital quantity and the NTC digital quantity, the measured temperature of the object to be measured can be quickly calculated through the temperature calculation formula, saving search time.

Description

Technical Field

[0001] This application relates to the field of temperature calibration, and in particular to a temperature calibration method, a storage medium, and related devices based on a thermopile. Background Art

[0002] In current production and life, we often need to measure the temperature of an object to determine its state. For example, by detecting the temperature of a device, we can know whether it is in a normal operating state. The temperature measurement methods are divided into contact temperature measurement and non-contact temperature measurement. When measuring the temperature of high-temperature, dangerous, and difficult-to-contact objects, the traditional contact temperature measurement method is difficult to play a role, while non-contact temperature measurement can make up for these shortcomings.

[0003] In the existing non-contact infrared temperature measurement technology, the thermopile has been widely used in production and life due to its advantages of low cost, convenience, durability, and wide temperature range.

[0004] In the existing thermopile infrared temperature measurement technology, the measured blackbody temperature is affected by the ambient temperature where the thermopile itself is located. Therefore, it is necessary to first establish a mapping relationship table between the thermopile thermoelectric emf and different blackbody temperatures at different ambient temperatures. For example, when the ambient temperature range is 0°C to 100°C and the calibration temperature is 0°C to 200°C, when the accuracy is 1°C, a table with 101*201 data needs to be constructed. When in use, it is necessary to first measure the current ambient temperature with a high-precision thermistor, measure the thermopile thermoelectric emf at this ambient temperature, and then output the measured temperature corresponding to the thermopile thermoelectric emf at the current ambient temperature by looking up the table. When the measurement temperature range is large and the accuracy requirement is high, for example, when the accuracy is set to 0.1°C, then the amount of table data will increase by 10 times, about 200,000 data, and the search speed is slow, and the actual temperature measurement application performance is not ideal. Summary of the Invention

[0005] This application provides a temperature calibration method based on a thermopile. By fitting the functional relationship between the digital quantity of the thermopile and the measured temperature within the ambient temperature range through a temperature calculation formula, after obtaining the digital quantity of the thermopile and the digital quantity of the NTC, the measured temperature of the object to be measured can be quickly calculated through the temperature calculation formula, saving the search time. The technical solution is as follows:

[0006] In a first aspect, an embodiment of this application provides a temperature calibration method based on a thermopile, which is applied to a computer device. The computer device is connected to a development board, the development board is connected to a thermopile sensor, the thermopile sensor is fixed on a fixed tooling, the fixed tooling and the thermopile sensor are placed inside a thermostat, the irradiation direction of the thermopile sensor is at the ventilation opening of the thermostat, and the object to be measured is placed at the ventilation opening. The method includes:

[0007] Obtain the target thermopile digital quantity and the target NTC digital quantity sent by the development board. The target thermopile digital quantity and the target NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor. The thermopile analog quantity is the thermoelectric potential difference generated by the temperature difference between the ambient temperature of the thermostat and the calibrated temperature of the object to be measured. The NTC analog quantity is the ambient temperature of the thermostat. When the calibrated temperature is required, the object to be measured is a blackbody radiation source;

[0008] Convert the target NTC digital quantity into the target ambient temperature, and determine the temperature calculation formula corresponding to the target ambient temperature. The temperature calculation formula represents the functional relationship between the thermopile digital quantity and the calibrated temperature of the blackbody radiation source;

[0009] Substitute the target thermopile digital quantity into the temperature calculation formula to obtain the measured temperature of the object to be measured.

[0010] By adopting the above technical solution, when the thermopile sensor measures the temperature of the object to be measured, the temperature calculation formula corresponding to the target ambient temperature can be determined through the obtained target NTC digital quantity, and the measured temperature of the object to be measured can be obtained by substituting the target thermopile digital quantity. Compared with the look-up table method, there is no need to store a large number of data units, and only the temperature calculation formula corresponding to the target ambient temperature needs to be determined; when the target ambient temperature or the temperature of the object to be measured is in a changing state, the temperature calculation formula can be used to quickly respond to obtain the measured temperature, saving the data search time.

[0011] Optionally, before obtaining the target thermopile digital quantity and the target NTC digital quantity sent by the development board, it further includes:

[0012] Evenly select M temperature sampling points within the set ambient temperature range, and evenly select N temperature test points within the set calibrated temperature range of the blackbody radiation source. Obtain M*N groups of thermopile digital quantities and NTC digital quantities sent by the development board at the M temperature sampling points and the N temperature test points. Both M and N are positive integers. The thermopile digital quantity and the NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor;

[0013] Convert the NTC digital quantity into the ambient temperature, and establish a temperature calculation formula in different ambient temperature ranges. The temperature calculation formula represents the functional relationship between the thermopile digital quantity and the calibrated temperature.

[0014] By adopting the above technical solution, the M*N groups of thermopile digital quantities and NTC digital quantities are processed, the functional relationship between the thermopile digital quantity and the calibrated temperature in different environmental temperature ranges is established, a large amount of original data is collected in the early stage, and multiple groups of formulas are summarized. In the future, only formula calculation is needed for use.

[0015] Optionally, before establishing the temperature calculation formula in different environmental temperature ranges, it includes:

[0016] Divide the interval between two adjacent temperature sampling points according to the temperature measurement accuracy, compare the thermopile digital quantities of the two adjacent temperature sampling points, and obtain the thermopile digital quantity corresponding to each division point.

[0017] By adopting the above technical solution, the environmental temperature range is divided by two adjacent temperature sampling points. The thermopile digital quantity of the division point within the environmental temperature range falls between the two temperature sampling points. Calculate the thermopile digital quantity between two adjacent temperature sampling points, so that higher accuracy can be achieved for the points within the temperature range during subsequent use.

[0018] Optionally, the temperature calculation formula established in different environmental temperature ranges includes:

[0019] Take two adjacent temperature sampling points as an environmental temperature range, use the Polynomial curve in the simulation software to perform polynomial curve fitting on the thermopile digital quantity and the calibrated temperature within each environmental temperature range, and obtain M-1 groups of temperature calculation formulas;

[0020] Adjust the variable order in the temperature calculation formula, record the M-1 groups of temperature calculation formulas that meet the accuracy requirements, and incorporate the temperature calculation formula into the program.

[0021] By adopting the above technical solution, using the Polynomial curve in the simulation software to perform polynomial curve fitting on the thermopile digital quantity and the calibrated temperature within each environmental temperature range can find the most suitable functional relationship within the environmental temperature range and improve the accuracy of temperature measurement.

[0022] Optionally, the adjusting the variable order in the polynomial and recording the M-1 groups of temperature calculation formulas that meet the accuracy requirements includes:

[0023] Calculate the first result corresponding to the N thermopile digital quantities of M temperature sampling points according to the temperature calculation formula, obtain the second result corresponding to the calibrated temperature of N temperature test points, and perform difference processing on the first result and the second result;

[0024] If the difference meets the accuracy requirements, record the calculation formula that meets the accuracy;

[0025] If the difference does not meet the accuracy requirement, adjust the variable order in the temperature calculation formula until the accuracy requirement is met.

[0026] By adopting the above technical solution, according to the accuracy requirement, in all temperature ranges, the measured temperature calculated by substituting the thermopile digital quantity into the temperature calculation formula is compared with the calibrated temperature, and the final temperature calculation formula is determined according to the comparison result. When it is necessary to improve the measurement accuracy of the thermopile sensor subsequently, the variable order of the temperature calculation formula can be adjusted to make the accuracy meet higher requirements.

[0027] Optionally, the obtaining of the M*N groups of thermopile digital quantities and NTC digital quantities at M temperature sampling points and N temperature test points sent by the development board includes:

[0028] Obtain multiple groups of thermopile digital quantities and NTC digital quantities at each temperature sampling point and each temperature test point sent by the development board;

[0029] Perform mean processing on the multiple groups of thermopile digital quantities and NTC digital quantities at each temperature sampling point and each temperature test point to obtain M*N groups of thermopile digital quantities and NTC digital quantities at M temperature sampling points and N temperature test points.

[0030] By adopting the above technical solution, when collecting the thermopile digital quantity and NTC digital quantity at each temperature sampling point and each temperature test point, multiple groups of data are collected simultaneously, which can reduce errors and avoid the influence of too large or too small data in a single collection on the subsequent formula fitting.

[0031] Optionally, after converting the target NTC digital quantity into the target ambient temperature, it further includes:

[0032] Judge whether the target ambient temperature is within the ambient temperature range;

[0033] If the target ambient temperature is not within the ambient temperature range, output information indicating that the target ambient temperature is abnormal.

[0034] By adopting the above technical solution, the working environment of the thermopile sensor is judged to avoid the situation that the measured temperature is inaccurate or even the thermopile sensor is damaged when the thermopile sensor is used outside the ambient temperature range.

[0035] Optionally, after substituting the target thermopile digital quantity into the temperature calculation formula to obtain the measured temperature of the object to be measured, it further includes:

[0036] Judge whether the measured temperature is within the calibrated temperature range;

[0037] If the measured temperature is not within the calibrated temperature range, output information indicating that the measured temperature is abnormal;

[0038] If the measured temperature is within the calibrated temperature range of the thermopile, the measured temperature of the object to be measured is output.

[0039] By adopting the above technical solution, when the measured temperature is not within the calibrated temperature range, although the measured temperature of the object to be measured can be calculated by a formula, since the data outside the calibrated temperature range of the thermopile is not calibrated during temperature calibration, immeasurable errors will occur. Information indicating abnormal measured temperature is output to prompt the user that the measured temperature of the object to be measured has exceeded the range of this thermopile sensor and needs to be within the range for continued use.

[0040] In a second aspect, an embodiment of the present application provides a temperature calibration device based on a thermopile, characterized in that the device includes:

[0041] A target quantity acquisition module, configured to acquire a target thermopile digital quantity and a target NTC digital quantity sent by the development board, where the target thermopile digital quantity and the target NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor, the thermopile analog quantity is the thermoelectric emf generated by the temperature difference between the temperature of the constant temperature box and the calibrated temperature of the object to be measured, the NTC analog quantity is the temperature of the constant temperature box, and when the temperature needs to be calibrated, the object to be measured is a blackbody radiation source;

[0042] A temperature calculation formula establishment module, configured to convert the target NTC digital quantity into a target ambient temperature, and determine a temperature calculation formula corresponding to the target ambient temperature, where the temperature calculation formula represents the functional relationship between the thermopile digital quantity and the calibrated temperature;

[0043] A measured temperature calculation module, configured to substitute the target thermopile digital quantity into the temperature calculation formula to obtain the measured temperature of the object to be measured.

[0044] In a third aspect, an embodiment of the present application provides a computer storage medium, where the computer storage medium stores multiple instructions, and the instructions are suitable for being loaded and executed by a processor to perform the above method steps.

[0045] In a fourth aspect, an embodiment of the present application provides a computer device, which may include: a processor and a memory; wherein, the memory stores a computer program, and the computer program is suitable for being loaded and executed by the processor to perform the above method steps.

[0046] The beneficial effects brought by the technical solutions provided by some embodiments of the present application at least include:

[0047] In one or more embodiments of the present application, a target thermopile digital quantity and a target NTC digital quantity sent by the development board are obtained, the target NTC digital quantity is converted into a target ambient temperature, a temperature calculation formula corresponding to the target ambient temperature is determined, and the target thermopile digital quantity is substituted into the temperature calculation formula to obtain the measured temperature of the object to be measured. By establishing the relationship between the thermopile digital quantity and the measured temperature at different ambient temperatures in the form of a temperature calculation formula, a large amount of data storage space and response time can be reduced, and the measured temperature can be quickly obtained when the temperature of the object to be measured changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 FIG. is a schematic diagram of the system architecture of a temperature calibration method based on a thermopile provided by an embodiment of the present application;

[0049] Figure 2 FIG. is a schematic flowchart of a temperature calibration method based on a thermopile provided by an embodiment of the present application;

[0050] Figure 3 FIG. is a schematic flowchart of a temperature calibration method based on a thermopile provided by an embodiment of the present application;

[0051] Figure 4 FIG. is a schematic structural diagram of a temperature calibration device based on a thermopile provided by an embodiment of the present application;

[0052] Figure 5 FIG. is a schematic structural diagram of a computer device provided by an embodiment of the present application.

[0053] DESCRIPTION OF THE REFERENCE NUMERALS: 11, target quantity acquisition module; 12, temperature calculation formula determination module; 121, formula fitting unit; 122, formula adjustment unit; 13, measured temperature calculation module; 14, temperature sampling and calibration module; 141, error reduction unit; 15, temperature range segmentation module; 16, ambient temperature range judgment module; 17, calibrated temperature range judgment module; 1000, computer device; 1001, processor; 1002, communication bus; 1003, user interface; 1004, network interface; 1005, memory. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] In order to enable those skilled in the art to better understand the technical solutions in this specification, the following will clearly and completely describe the technical solutions in the embodiments of this specification with reference to the accompanying drawings in the embodiments of this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0055] In the description of the embodiments of the present application, words such as "exemplary", "for example", or "for illustration" are used to give examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary", "for example", or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example", or "for illustration" is intended to present the relevant concepts in a specific manner.

[0056] In the description of the embodiments of the present application, the term "and / or" is merely an associative relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, B exists alone, and both A and B exist simultaneously. Additionally, unless otherwise specified, the meaning of the term "plural" refers to two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. Furthermore, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0057] The present application will be described in detail below in conjunction with specific embodiments.

[0058] Please refer to Figure 1 , which is a schematic diagram of the system architecture for temperature calibration based on a thermopile provided by the embodiments of the present application, and includes:

[0059] This system consists of a thermopile sensor, a blackbody radiation source, a constant temperature box, a development board, a fixing fixture, a DC regulated power supply, and cables. The thermopile sensor is fixed on the fixing fixture, and the fixed thermopile sensor and the fixing fixture are fixed inside the constant temperature box. The thermopile sensor is connected to the development board through a cable, the development board is connected to the computer through a cable, and the blackbody radiation source is placed near the ventilation opening of the constant temperature box.

[0060] The thermopile sensor is formed by connecting multiple thermocouples in series. The two ends of the thermocouple are welded by two different materials, and an absorption film with a small heat capacity and an easy temperature rise after being irradiated by infrared rays is covered on one end. When one end is hotter and the other end is colder, due to the Seebeck effect, a thermoelectric potential difference will be generated at the open end of the thermocouple; because the generated thermoelectric potential difference is proportional to the temperature difference between the two ends, so if the temperature of the cold end is fixed, then the temperature of the hot end can be known from the magnitude of the thermoelectric potential difference of the thermocouple, and thus the thermopile can be used as a temperature sensor.

[0061] A blackbody radiation source is a perfect temperature radiator, that is, the radiation flux emitted by any non-blackbody is less than that emitted by a blackbody at the same temperature; moreover, the radiation ability of a non-blackbody is related not only to the temperature but also to the properties of the surface material, while the radiation ability of a blackbody is only related to the temperature. Temperature radiation means that any object, as long as its temperature is above absolute zero, will emit radiant energy to the surroundings and absorb radiant energy from the outside through electromagnetic radiation. In blackbody radiation, there are electromagnetic waves of various wavelengths, and the energy distribution according to wavelength is only related to the temperature of the blackbody. Therefore, a blackbody radiation source is often used as a temperature source for the calibration, measurement, and inspection of infrared measurement equipment.

[0062] An incubator is an enclosed box in which a fixed temperature value can be set. A thermopile sensor is placed in the incubator to simulate the ambient temperature of the thermopile sensor. Different ambient temperatures can be simulated by setting the value of the incubator.

[0063] During the temperature calibration process based on a thermopile, the object to be measured is replaced with a blackbody radiation source, and the temperature of the blackbody radiation source can be precisely set to calibrate the thermopile sensor as the calibration temperature.

[0064] Place the blackbody target surface of the blackbody radiation source outside the ventilation opening of the incubator, and place the thermopile sensor inside the ventilation opening of the incubator through a fixed fixture. Align the center of the blackbody target surface with the ventilation opening and the detection end of the thermopile sensor to achieve the purpose of complete and accurate data.

[0065] The development board consists of a voltage division circuit, an operational amplifier, and an A / D analog-to-digital converter. The thermopile digital quantity refers to the thermoelectric emf of the thermopile sensor, which is obtained after being amplified by the operational amplifier and then converted by the A / D analog-to-digital converter; the NTC digital quantity is measured by a thermistor used for setting the cold end of the thermopile sensor. The change in the NTC resistance value is deduced through the voltage division circuit, and then the ambient temperature is calculated according to the calculation formula.

[0066] When collecting temperature calibration data, first set the ambient temperature and the calibration temperature. After the incubator is kept warm for one hour, observe whether the NTC digital quantity is stable. If it is stable, it means that the incubator has stabilized at the set ambient temperature. At this time, open the ventilation opening, and the thermopile sensor measures the magnitude of the calibration temperature of the blackbody radiation source, and record the thermopile digital quantity. Change the set ambient temperature and calibration temperature, repeat the above steps, and record the data of the thermopile digital quantity and the NTC digital quantity at all ambient temperatures and calibration temperatures.

[0067] Through the above steps, all data are collected and recorded at the sampling points. The blackbody radiation source and the incubator respectively simulate the object to be measured and the ambient temperature, which can completely reproduce the actual usage scenario with high accuracy, facilitating the quick and accurate obtaining of measurement results during actual use.

[0068] In one embodiment, as Figure 2 shown, a temperature calibration method based on a thermopile is proposed. This method can be implemented depending on a computer program, can be implemented depending on a single-chip microcomputer, or can run on a computer device based on the von Neumann architecture. This computer program can be integrated into an application or can run as an independent tool-class application.

[0069] Specifically, the temperature calibration method based on the thermopile includes:

[0070] Step S101: Obtain the target thermopile digital quantity and the target NTC digital quantity sent by the development board. The target thermopile digital quantity and the target NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor.

[0071] The target thermopile digital quantity is that at an ambient temperature, the radiation amounts of the object under test received by the cold end and the hot end of the thermopile are different. Due to the presence of an absorption film at the hot end, the temperature change is relatively large compared to the temperature change at the cold end. Therefore, a thermoelectric potential difference is generated between the two ends, and this thermoelectric potential difference is output as the target thermopile digital quantity after passing through an amplifier circuit and analog-to-digital conversion.

[0072] When using the thermopile sensor for temperature measurement, the current ambient temperature of the thermopile is determined according to the resistance value of the thermistor of the thermopile. That is, the ambient temperature can be conveniently obtained by the temperature corresponding to the resistance value of the NTC resistor (negative temperature coefficient thermistor), NTC (thermistor, Negative Temperature Coefficient thermistor). This NTC resistor is a high-precision thermistor, and the target ambient temperature can be obtained through a voltage division circuit and the changing resistance value of the thermistor.

[0073] Step S102: Convert the target NTC digital quantity into the target ambient temperature, and determine the temperature calculation formula corresponding to the target ambient temperature. The temperature calculation formula represents the functional relationship between the thermopile digital quantity and the calibration temperature of the blackbody radiation source.

[0074] When converting the target NTC digital quantity into the target ambient temperature, the target ambient temperature can be obtained by substituting the change amount of the resistance value of the voltage division circuit and the thermistor into the temperature-resistance corresponding formula.

[0075] At an ambient temperature, different measured digital values of the target thermopile correspond to different calibrated temperatures. The functional relationship between the two at this ambient temperature is found, and the functional relationship is compiled into a temperature calculation formula. Therefore, different ambient temperatures correspond to different temperature calculation formulas. According to the target ambient temperature converted from the target NTC digital value, the temperature calculation formula at this target ambient temperature is used.

[0076] Step S103: Substitute the target thermopile digital value into the temperature calculation formula to obtain the measured temperature of the object under test.

[0077] At different ambient temperatures, the functional relationship between the calibrated temperature and the coordinate parameters of the thermopile digital value is established in the form of a mathematical formula, and the target thermopile digital value is substituted into the temperature calculation formula to obtain the measured temperature of the object under test.

[0078] Optionally, after converting the target NTC digital value into a target ambient temperature, it further includes:

[0079] Judge whether the target ambient temperature is within the ambient temperature range;

[0080] If the target ambient temperature is not within the ambient temperature range, an information indicating that the target ambient temperature is abnormal is output.

[0081] The ambient temperature range of the thermopile sensor represents that it can work normally at this ambient temperature. When used outside the range, the measurement result will be inaccurate and have a large deviation. In severe cases, it may even cause irreversible damage to the device and the device cannot work.

[0082] Optionally, after substituting the target thermopile digital value into the temperature calculation formula to obtain the measured temperature of the object under test, it further includes:

[0083] Judge whether the measured temperature is within the calibrated temperature range;

[0084] If the measured temperature is not within the calibrated temperature range, an information indicating that the measured temperature is abnormal is output;

[0085] If the measured temperature is within the thermopile calibrated temperature range, the measured temperature of the object under test is output.

[0086] When the measured temperature value obtained according to the temperature calculation formula is not within the calibrated temperature range, since the temperature calculation formula only establishes a functional relationship for the points within the range, for the measurement results outside the calibrated temperature range, the reliability and accuracy of the measured temperature cannot be confirmed, and the gap from the actual temperature of the object under test cannot be estimated, which has no practical significance.

[0087] In the embodiments of the present application, the target thermopile digital quantity and the target NTC digital quantity are obtained. The target ambient temperature is calculated through the target NTC digital quantity, and the measured temperature can be obtained by substituting the target thermopile digital quantity into the temperature calculation formula within the corresponding target ambient temperature range. Compared with the traditional method of looking up a table to determine the target ambient temperature and the thermopile digital quantity and then finding the result among numerous data, the present application is more simple and fast. Moreover, when the temperature changes rapidly, the table lookup method needs to bear a huge burden of reading and searching and is difficult to respond to the output of temperature changes. By dividing the ambient temperature range, the temperature calculation formula corresponding to the current ambient temperature can be quickly determined.

[0088] Please refer to Figure 3 , which is a schematic flowchart of another embodiment of a temperature calibration method based on a thermopile provided by the embodiments of the present application. The process of the thermopile sensor collecting raw data and fitting the temperature calculation formula includes:

[0089] Step S201: M temperature sampling points are equally spaced within the set ambient temperature range, and N temperature test points are equally spaced within the set calibration temperature range of the blackbody radiation source. M×N groups of thermopile digital quantities and NTC digital quantities at the M temperature sampling points and the N temperature test points are obtained. Both M and N are positive integers, and the thermopile digital quantity and the NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor. For example, if the ambient temperature range of the thermopile sensor is 0°C to +85°C and the calibration temperature range is -5°C to +300°C, and they are grouped every 5°C, there are 18 temperature sampling points and 62 temperature test points, and the values of M and N are 18 and 62 respectively.

[0090] The thermopile sensor is placed in a constant temperature oven to realize the value taking of the temperature sampling points within the ambient temperature range. The value taking of the temperature test points within the calibration temperature range is realized by the blackbody radiation source. The blackbody radiation source only radiates and does not reflect electromagnetic waves, and the radiation energy is only affected by its own temperature, and it is widely used for the calibration of thermopile infrared temperature measurement.

[0091] Step S202: Divide the interval between two adjacent temperature sampling points according to the temperature measurement accuracy, and compare the thermopile digital quantities of the two adjacent temperature sampling points to obtain the thermopile digital quantity corresponding to each division point.

[0092] For example, at a certain calibration temperature, the two sets of data corresponding to the ambient temperatures of 5°C and 10°C are 1950 LSB and 1900 LSB respectively (LSB is the unit of digital quantity). Take the difference between the two sets of data, 1950 LSB - 1900 LSB = 50 LSB. The difference in ambient temperature is 10°C - 5°C = 5. It is equivalent to that when the target temperature is constant, when the ambient temperature increases by 1°C, the corresponding code value will decrease by 50 LSB / 5°C = 10 LSB. Process all the remaining data according to this method of calculating the mean value and make good records.

[0093] The digital quantity of the thermopile at each segmentation point is obtained from the linear relationship of the digital quantity of the thermopile between two adjacent temperature sampling points. Subsequently, during the actual measurement process, when the value of the target ambient temperature is within the temperature sampling interval, the corresponding temperature calculation formula is determined by determining the temperature sampling interval.

[0094] Step S203: Take two adjacent temperature sampling points as an ambient temperature interval, and use the Polynomial curve in the simulation software to perform polynomial curve fitting on the digital quantity of the thermopile and the calibration temperature within each ambient temperature interval, obtaining M - 1 sets of temperature calculation formulas;

[0095] Adjust the variable order in the temperature calculation formula, record the M - 1 sets of temperature calculation formulas that meet the accuracy requirements, and incorporate the temperature calculation formula into the program.

[0096] The Polynomial curve refers to a polynomial curve. When performing polynomial curve fitting, first generate the original data points for plotting. For example, within the above ambient temperature interval, fit five sets of data at intervals of 1°C into a curve. One temperature calculation formula is generated for each ambient temperature interval, obtaining 17 sets of temperature calculation formulas. Each temperature calculation formula corresponds to the corresponding ambient temperature range of use.

[0097] Take one ambient temperature interval as a data set, perform polynomial curve fitting on the digital quantity of the thermopile and the corresponding calibration temperature within this set. During the fitting process, adjust the variable order of the temperature calculation formula to make the polynomial curve as close as possible to the coordinate points corresponding to the digital quantity of the thermopile and the calibration temperature within the temperature interval.

[0098] Step S204: Calculate the first result corresponding to the N digital quantities of the thermopile at M temperature sampling points according to the temperature calculation formula, obtain the second result corresponding to the calibration temperature of the N temperature test points, and perform difference processing on the first result and the second result;

[0099] If the difference meets the accuracy requirements, record the temperature calculation formula that meets the accuracy;

[0100] If the difference does not meet the accuracy requirement, adjust the variable order in the temperature calculation formula until the accuracy requirement is met.

[0101] For example, when the accuracy is ±1°C, the difference between all the first results and the second results is less than 1°C, which means the accuracy requirement is met. If different accuracy requirements are needed, just adjust the variable order of the temperature calculation formula when fitting the polynomial curve.

[0102] At a certain temperature sampling point, substitute the thermopile digital quantity into the temperature calculation formula of this temperature sampling point to obtain N calculated first results. Take the difference between the first results and the second results corresponding to the calibrated temperature. If all N difference results are less than the accuracy requirement, record this temperature calculation formula. If the accuracy requirement is not met, continue to adjust the variable order of the temperature calculation formula until the requirement is met. By adjusting the order, the measurement accuracy requirement of the thermopile sensor is met.

[0103] Optionally, obtain multiple groups of thermopile digital quantities and NTC digital quantities at each temperature sampling point and each temperature test point sent by the development board;

[0104] Perform mean processing on the multiple groups of thermopile digital quantities and NTC digital quantities at each temperature sampling point and each temperature test point to obtain M*N groups of thermopile digital quantities and NTC digital quantities at M temperature sampling points and N temperature test points.

[0105] In the process of obtaining each group of thermopile digital quantities and NTC digital quantities, obtain multiple groups of data each time and perform mean processing on them, which can effectively reduce errors.

[0106] Step S205: Obtain the target thermopile digital quantity and the target NTC digital quantity, calculate the target ambient temperature through the target NTC digital quantity, and substitute the target thermopile digital quantity into the temperature calculation formula within the corresponding target ambient temperature range to obtain the measured temperature of the object to be measured.

[0107] In the application of the thermopile sensor, after obtaining the target thermopile digital quantity and the target NTC digital quantity, calculate the target ambient temperature according to the programmed procedure and quickly determine the temperature calculation formula for the target ambient temperature range. The program only needs to judge and select the corresponding temperature calculation formula, and substitute the obtained thermopile digital quantity into the formula to obtain the measured temperature.

[0108] In the embodiment of the present application, divide by ambient temperature zones, fit the corresponding relationship between the thermopile digital quantity and the calibrated temperature within the zone through the temperature calculation formula. After meeting the accuracy requirement, incorporate the temperature calculation formula into the program. During subsequent use, only need to collect the target thermopile digital quantity and the target NTC digital quantity to quickly obtain the result.

[0109] In the embodiment of the present application, divide by ambient temperature zones, fit the corresponding relationship between the thermopile digital quantity and the calibrated temperature within the zone through the temperature calculation formula. After meeting the accuracy requirement, incorporate the temperature calculation formula into the program. During subsequent use, only need to collect the target thermopile digital quantity and the target NTC digital quantity to quickly obtain the result.

[0110] The following is an embodiment of the device of the present application, which can be used to execute the method embodiment of the present application. For the details not disclosed in the device embodiment of the present application, please refer to the method embodiment of the present application.

[0111] Please refer to Figure 4 , which shows a schematic structural diagram of a device for temperature calibration based on a thermopile provided by an exemplary embodiment of the present application. The device for temperature calibration based on a thermopile can be implemented as all or part of the device through software, hardware, or a combination of both. The device includes a target quantity acquisition module 11, a temperature calculation formula determination module 12, and a measured temperature calculation module 13.

[0112] The target quantity acquisition module 11 is configured to acquire the target thermopile digital quantity and the target NTC digital quantity sent by the development board. The target thermopile digital quantity and the target NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor. The thermopile analog quantity is the thermoelectric emf generated by the temperature difference between the ambient temperature of the thermostat and the calibration temperature of the object to be measured. The NTC analog quantity is the ambient temperature of the thermostat. When the temperature needs to be calibrated, the object to be measured is a blackbody radiation source;

[0113] The temperature calculation formula determination module 12 is configured to convert the target NTC digital quantity into the target ambient temperature and determine the temperature calculation formula corresponding to the target ambient temperature. The temperature calculation formula represents the functional relationship between the thermopile digital quantity and the calibration temperature of the blackbody radiation source;

[0114] The measured temperature calculation module 13 is configured to substitute the target thermopile digital quantity into the temperature calculation formula to obtain the measured temperature of the object to be measured.

[0115] Optionally, as Figure 4 shown, the device further includes a temperature sampling and calibration module 14, which is configured to:

[0116] Equidistantly select M temperature sampling points within the set ambient temperature range, and equidistantly select N temperature test points within the set calibration temperature range of the blackbody radiation source. Obtain M*N groups of thermopile digital quantities and NTC digital quantities sent by the development board at the M temperature sampling points and the N temperature test points. Both M and N are positive integers. The thermopile digital quantity and the NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor;

[0117] Convert the NTC digital quantity into the ambient temperature and establish a temperature calculation formula in different ambient temperature intervals. The temperature calculation formula represents the functional relationship between the thermopile digital quantity and the calibration temperature.

[0118] Optionally, asFigure 4 As shown, the device further includes:

[0119] A temperature range segmentation module 15, configured to segment the range between two adjacent temperature sampling points according to the temperature measurement accuracy, compare the thermopile digital quantities of the two adjacent temperature sampling points, and obtain the thermopile digital quantity corresponding to each segmentation point.

[0120] Optionally, as Figure 4 shown, the 12 includes:

[0121] A formula fitting unit 121, configured to use two adjacent temperature sampling points as an ambient temperature range, perform polynomial curve fitting on the thermopile digital quantity and the calibrated temperature within each ambient temperature range using the Polynomial curve in the simulation software, and obtain M - 1 groups of temperature calculation formulas;

[0122] A formula adjustment unit 122, configured to adjust the variable order in the temperature calculation formula, record the M - 1 groups of temperature calculation formulas that meet the accuracy requirements, and program the temperature calculation formula.

[0123] Optionally, as Figure 4 shown, the formula adjustment unit 122 is specifically configured to:

[0124] Calculate a first result corresponding to the N thermopile digital quantities of M temperature sampling points according to the temperature calculation formula, obtain a second result corresponding to the calibrated temperature of N temperature test points, and perform a difference process on the first result and the second result;

[0125] If the difference meets the accuracy requirements, record the temperature calculation formula that meets the accuracy;

[0126] If the difference does not meet the accuracy requirements, adjust the variable order in the temperature calculation formula until the accuracy requirements are met.

[0127]

[0128] Optionally, as Figure 4 shown, the temperature sampling and calibration module 14 includes an error reduction unit 141, configured to:

[0129] Obtain multiple groups of thermopile digital quantities and NTC digital quantities at each temperature sampling point and each temperature test point sent by the development board;

[0130] Perform an averaging process on the multiple groups of thermopile digital quantities and NTC digital quantities at each temperature sampling point and each temperature test point, and obtain M * N groups of thermopile digital quantities and NTC digital quantities at M temperature sampling points and N temperature test points.

[0131] Optionally, as Figure 4 ​As shown, the device further includes an ambient temperature range judgment module 16 for:

[0132] judging whether the target ambient temperature is within the ambient temperature range;

[0133] if the target ambient temperature is not within the ambient temperature range, outputting information indicating that the target ambient temperature is abnormal.

[0134] Optionally, as Figure 4 shown, the device further includes a calibrated temperature range judgment module 17 for:

[0135] judging whether the measured temperature is within the calibrated temperature range;

[0136] if the measured temperature is not within the calibrated temperature range, outputting information indicating that the measured temperature is abnormal;

[0137] if the measured temperature is within the thermopile calibrated temperature range, outputting the measured temperature of the object to be measured.

[0138] It should be noted that when the device for temperature calibration based on a thermopile provided in the above embodiment executes the temperature calibration method based on a thermopile, only the above-mentioned division of each functional module is used for illustration. In actual application, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device for temperature calibration based on a thermopile provided in the above embodiment and the embodiment of the temperature calibration method based on a thermopile belong to the same concept, and the implementation process is detailed in the method embodiment, which will not be elaborated here.

[0139] The serial numbers of the above embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0140] In one or more embodiments of the present application, a temperature calibration method based on a thermopile is proposed. The sensor of the thermopile generates different thermoelectric emf through the difference in temperature between the cold end and the hot end, so as to achieve the purpose of temperature measurement. The hot end is covered with an absorption film that is easy to absorb the radiation amount to generate a temperature difference. Therefore, at different ambient temperatures, the thermoelectric emf generated by the thermopile for the same calibrated temperature is also different. Therefore, it is necessary to establish the corresponding relationship between the thermoelectric emf output as the digital quantity of the thermopile and the calibrated temperature at different ambient temperatures in order to achieve the purpose of accurate temperature measurement. Compared with the traditional one-to-one correspondence relationship, in actual use, the temperature is mostly in a constantly changing state, and problems such as slow response speed and inaccurate temperature measurement will occur. The embodiments of the present application provide a temperature calibration method for establishing the corresponding relationship between the two through a functional relationship, which can quickly obtain the result through the temperature calculation formula in different temperature intervals during application, making up for the defects of the traditional look-up table method.

[0141] The embodiments of the present application also provide a computer storage medium, which can store multiple instructions, and the instructions are suitable for being loaded and executed by a processor to perform the Figures 1 - 4 positioning method as shown in the above Figures 1 - 4 embodiment. For the specific execution process, reference can be made to the

[0142] specific description of the embodiment shown above, which will not be elaborated here. Figure 5 Please refer to Figure 5 which is a schematic structural diagram of a computer device provided by the embodiments of the present application. As

[0143] shown, the computer device 1000 may include: at least one processor 1001, at least one network interface 1004, a user interface 1003, a memory 1005, and at least one communication bus 1002.

[0144] Among them, the communication bus 1002 is used to realize the connection and communication between these components.

[0145] Among them, the user interface 1003 may include a display screen (Display) and a camera (Camera). Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface.

[0146] Among them, the processor 1001 may include one or more processing cores. The processor 1001 connects various parts within the entire server 1000 through various interfaces and circuits. By running or executing instructions, programs, code sets, or instruction sets stored in the memory 1005, and by invoking the data stored in the memory 1005, it executes various functions of the server 1000 and processes data. Optionally, the processor 1001 may be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), or programmable logic array (PLA). The processor 1001 may integrate a combination of one or several of a central processing unit (CPU), a graphics processing unit (GPU), and a modem, etc. Among them, the CPU mainly processes the operating system, user interface, application programs, etc.; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 1001 and may be implemented separately by a single chip.

[0147] Among them, the memory 1005 may include a random access memory (RAM), or may also include a read-only memory. Optionally, the memory 1005 includes a non-transitory computer-readable storage medium. The memory 1005 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 1005 may include a program storage area and a data storage area. Among them, the program storage area may store instructions for implementing the operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area may store the data involved in the above-mentioned various method embodiments. Optionally, the memory 1005 may also be at least one storage device located far from the aforementioned processor 1001. As Figure 5 shown, the memory 1005, as a computer storage medium, may include an operating system, a network communication module, a user interface module, and an application program based on a thermopile temperature calibration method.

[0148] It should be noted that when the device provided in the above embodiments realizes its functions, only the division of the above functional modules is used for illustration. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiments belong to the same concept. For the specific implementation process, please refer to the method embodiments and will not be elaborated here.

[0149] In Figure 5 In the computer device 1000 shown, the user interface 1003 is mainly used to provide an interface for users to input data and obtain the data input by users. The processor 1001 can be used to call an application program stored in the memory 1005 for a thermopile temperature calibration method. When executed by one or more processors, the computer device is caused to execute the method as described in one or more of the above embodiments.

[0150] A computer device-readable storage medium, characterized in that the computer device-readable storage medium stores instructions. When executed by one or more processors, the computer device is caused to execute the method as described in one or more of the above embodiments.

[0151] Those skilled in the art can clearly understand that the technical solutions of the present application can be implemented by means of software and / or hardware. The "units" and "modules" in this specification refer to software and / or hardware that can independently complete or cooperate with other components to complete specific functions, where the hardware can be, for example, a Field-Programmable Gate Array (FPGA), an Integrated Circuit (IC), etc.

[0152] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0153] In the above embodiments, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0154] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some service interfaces. The indirect couplings or communication connections of the devices or units can be in electrical or other forms.

[0155] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0156] In addition, the functional units in various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0157] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned memory includes: USB flash drives, read-only memory (ROM), random access memory (RAM), mobile hard disks, magnetic disks, or optical discs, etc., which can store program codes.

[0158] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program. This program can be stored in a computer-readable memory. The memory can include: flash drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs, etc.

[0159] The foregoing are only exemplary embodiments of the present disclosure and should not be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not recorded in the present disclosure. The specification and embodiments are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A temperature calibration method based on a thermopile, characterized in that, Applied to a computer device, the computer device is connected to a development board, the development board is connected to a thermopile sensor, the thermopile sensor is fixed on a fixing tooling, the fixing tooling and the thermopile sensor are placed inside a thermostat, the irradiation direction of the thermopile sensor is at the ventilation opening of the thermostat, and a measured object is placed at the ventilation opening. The method includes: Equidistantly select M temperature sampling points within a set environmental temperature range, and equidistantly select N temperature test points within a set calibration temperature range of a blackbody radiation source. Obtain M*N groups of thermopile digital quantities and NTC digital quantities sent by the development board at the M temperature sampling points and the N temperature test points. Both M and N are positive integers, and the thermopile digital quantity and the NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor; Convert the NTC digital quantity into an environmental temperature, and establish a temperature calculation formula in different environmental temperature intervals. The temperature calculation formula characterizes the functional relationship between the thermopile digital quantity and the calibration temperature; Obtain the target thermopile digital quantity and the target NTC digital quantity sent by the development board. The target thermopile digital quantity and the target NTC digital quantity are obtained by analog-to-digital conversion of the thermopile analog quantity and the NTC analog quantity collected by the thermopile sensor. The thermopile analog quantity is the thermoelectric emf generated by the temperature difference between the environmental temperature of the thermostat and the calibration temperature of the measured object, and the NTC analog quantity is the environmental temperature of the thermostat. When the calibration temperature is required, the measured object is a blackbody radiation source; Convert the target NTC digital quantity into a target environmental temperature, and determine the temperature calculation formula corresponding to the target environmental temperature. The temperature calculation formula characterizes the functional relationship between the thermopile digital quantity and the calibration temperature of the blackbody radiation source; Substitute the target thermopile digital quantity into the temperature calculation formula to obtain the measured temperature of the measured object.

2. The method according to claim 1, characterized in that, Before establishing the temperature calculation formula in different environmental temperature intervals, it further includes: Divide the interval between two adjacent temperature sampling points according to the temperature measurement accuracy, compare the thermopile digital quantities of the two adjacent temperature sampling points, and obtain the thermopile digital quantity corresponding to each division point.

3. The method according to claim 1, characterized in that The establishment of the temperature calculation formula in different environmental temperature intervals includes: Take two adjacent temperature sampling points as an environmental temperature interval, and use the Polynomial curve in the simulation software to perform polynomial curve fitting on the thermopile digital quantity and the calibration temperature within each environmental temperature interval to obtain M-1 groups of temperature calculation formulas; Adjust the variable order in the temperature calculation formula, record the M-1 groups of temperature calculation formulas that meet the accuracy requirements, and program the temperature calculation formula.

4. The method according to claim 3, characterized in that, The adjustment of the variable order in the polynomial and the recording of the M-1 groups of temperature calculation formulas that meet the accuracy requirements include: Calculate the first result corresponding to the N thermopile digital quantities of the M temperature sampling points according to the temperature calculation formula, obtain the second result corresponding to the calibration temperature of the N temperature test points, and perform a difference processing on the first result and the second result; If the difference meets the accuracy requirement, record the temperature calculation formula that meets the accuracy. If the difference does not meet the accuracy requirement, adjust the variable order in the temperature calculation formula until the accuracy requirement is met. The obtaining of the M*N groups of thermopile digital quantities and NTC digital quantities at M temperature sampling points and N temperature test points sent by the development board includes:

5. The method according to claim 1, characterized in that, Obtain multiple groups of thermopile digital quantities and NTC digital quantities at each temperature sampling point and each temperature test point sent by the development board; Perform mean processing on the multiple groups of thermopile digital quantities and NTC digital quantities at each temperature sampling point and each temperature test point to obtain M*N groups of thermopile digital quantities and NTC digital quantities at M temperature sampling points and N temperature test points. After converting the target NTC digital quantity into the target ambient temperature, it further includes:

6. The method according to claim 1, characterized in that Judge whether the target ambient temperature is within the ambient temperature range; If the target ambient temperature is not within the ambient temperature range, output information indicating that the target ambient temperature is abnormal. After substituting the target thermopile digital quantity into the temperature calculation formula to obtain the measured temperature of the object under test, it further includes:

7. The method according to claim 1, characterized in that, Judge whether the measured temperature is within the calibrated temperature range; If the measured temperature is not within the calibrated temperature range, output information indicating that the measured temperature is abnormal; If the measured temperature is within the thermopile calibrated temperature range, output the measured temperature of the object under test. It includes a processor, a memory, and a transceiver. The memory is used to store instructions, the transceiver is used to communicate with other devices, and the processor is used to execute the instructions stored in the memory so that the computer device executes the method steps described in any one of claims 1 to 7.

8. A computer device, characterized in that, The computer storage medium stores multiple instructions, and the instructions are suitable for being loaded and executed by the processor to execute the method steps described in any one of claims 1 to 7.

9. A computer storage medium, characterized in that, ​

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