CN115574979A - Surface temperature source calibration method - Google Patents
Surface temperature source calibration method Download PDFInfo
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- CN115574979A CN115574979A CN202211315615.4A CN202211315615A CN115574979A CN 115574979 A CN115574979 A CN 115574979A CN 202211315615 A CN202211315615 A CN 202211315615A CN 115574979 A CN115574979 A CN 115574979A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/002—Calibrated temperature sources, temperature standards therefor
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Abstract
The invention discloses a surface temperature source calibration method, which relates to the technical field of temperature measurement equipment calibration and comprises the following steps: the method comprises the steps of heating a standard hot plate to a set temperature and keeping the temperature constant, taking a high-stability and high-accuracy surface thermometer as a transmission medium, respectively measuring the temperatures of the standard hot plate and a hot plate of a surface temperature source to obtain the measured temperature of the standard hot plate and the measured temperature of the hot plate of the surface temperature source, obtaining a corrected value of the surface thermometer according to the set temperature of the standard hot plate and the measured temperature of the standard hot plate measured by the surface thermometer, calibrating the surface temperature source according to the corrected value of the surface thermometer, and obtaining the actual temperature of the hot plate of the surface temperature source. The surface temperature source calibration method provided by the invention can accurately calibrate the surface temperature source and ensure that the uncertainty of the surface temperature source meets the requirement.
Description
Technical Field
The invention relates to the technical field of temperature measurement equipment calibration, in particular to a surface temperature source calibration method.
Background
The surface thermometer is an instrument for measuring the surface temperature of a solid, and consists of a temperature sensor and a digital temperature indicating instrument, the temperature measuring principle is that a temperature sensing element of the temperature sensor in the surface thermometer is tightly pressed on the surface of a measured object, and the surface temperature of the measured object is displayed by the indicating instrument, so that the surface thermometer is widely applied to industries of aviation, aerospace, energy, chemical engineering, textile and the like and other research works needing to accurately measure the surface temperature. The surface temperature source is a device for calibrating various surface thermometers such as a thermocouple, a thermal resistor and the like, as shown in fig. 1, the surface temperature source 3 consists of a hot plate 4, a temperature control device 6 and a measuring instrument matched with the hot plate 4, the temperature of the surface temperature source is measured by a platinum resistance thermometer 7 arranged on the lower surface of the hot plate 4, and a stable and uniform temperature field with adjustable temperature can be provided.
The existing surface temperature source calibration method has the following problems: 1. the method is lack of a calibration basis which is mainly carried out according to the annex of JJF1409-2013 & lt & gt surface thermometer calibration Specification & gt, but only provides provisions for a temperature stability and uniformity measurement method of a surface temperature source, and is lack of an error measurement method; 2. the error measurement of the surface temperature source by various technical mechanisms at present is actually the error of a platinum resistance thermometer built in the surface temperature source, the surface temperature source is a plane temperature field, the platinum resistance thermometer only measures one temperature point on the lower surface, and the condition that the error of the platinum resistance thermometer is not consistent with the error of a hot plate possibly exists; 3. the surface thermometer and the platinum resistance thermometer are distributed on the upper surface and the lower surface of the measuring hot plate, so that the problems of inconsistent upper and lower surface temperatures and inconsistent upper and lower positions exist; 4. the hot plate is heated by a precision electrical resistance at its lower level, so the uncertainty introduced by the surface temperature source is too large, eventually leading to an uncertainty of 1 ℃ for the surface thermometer.
Disclosure of Invention
The invention aims to provide a surface temperature source calibration method, which is used for solving the problems in the prior art, accurately calibrating a surface temperature source and ensuring that the uncertainty meets the requirement.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a surface temperature source calibration method, which comprises the following steps:
heating a standard hot plate to a set temperature t and keeping the temperature constant, taking a surface thermometer as a transmission medium, respectively measuring the temperature of the standard hot plate and the temperature of a hot plate of a surface temperature source, and obtaining the measured temperature t of the standard hot plate 1 The measured temperature of the hot plate of the surface temperature source is t 2 Corrected value t of said surface thermometer Repair the ＝t-t 1 According to the correction value t of said surface thermometer Repair the Calibrating the surface temperature source to obtain the actual temperature t of the hot plate of the surface temperature source 0 ＝t 2 +t Repair the 。
Preferably, the standard hot plate is heated to a set temperature t in a standard thermostatic bath and kept constant.
Preferably, a standard platinum resistance thermometer is inserted into the standard thermostatic bath, and the measured temperature of the standard platinum resistance thermometer is taken as the actual temperature of the standard thermostatic bath.
Preferably, after the standard hot plate is hermetically connected to the bottom of the inner cylinder, the bottom end of the inner cylinder is placed in the standard thermostatic bath to heat the standard hot plate, the inner cylinder is made of a high-temperature-resistant heat-insulating material, and the standard hot plate is made of a red copper material.
Compared with the prior art, the invention achieves the following technical effects:
the invention provides a surface temperature source calibration method, which takes the upper surface temperature of a standard hot plate as a reference temperature, respectively measures the temperature of the standard hot plate and the temperature of a hot plate of a surface temperature source through a surface thermometer to obtain the measurement temperature of the standard hot plate and the measurement temperature of the hot plate of the surface temperature source, obtains the correction value of the surface thermometer by using the reference temperature of the standard hot plate and the measurement temperature of the standard hot plate measured by the surface thermometer, and then corrects the measurement temperature of the hot plate of the surface temperature source measured by the surface thermometer by using the correction value of the surface thermometer to obtain the actual temperature of the hot plate of the surface temperature source, realizes the accurate calibration of the surface temperature source, and avoids the problem of overlarge uncertainty caused by the calibration of the surface temperature source by adopting a method for calibrating a platinum resistance thermometer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a surface temperature source;
FIG. 2 is a schematic diagram of a process for calibrating a surface temperature source using the present method;
in the figure: 1-standard hot plate, 2-surface thermometer, 3-surface temperature source, 4-hot plate, 5-standard thermostatic bath, 6-temperature control device, 7-platinum resistance thermometer, 8-standard platinum resistance thermometer, and 9-inner cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a surface temperature source calibration method, which aims to solve the problems in the prior art, can accurately calibrate a surface temperature source and ensure that the uncertainty of the surface temperature source meets the requirement.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 2, the present embodiment provides a surface temperature source calibration method, including the following steps:
heating a standard hot plate 1 to a set temperature t in a standard constant temperature bath 5, keeping the temperature constant, measuring the temperature of the standard hot plate 1 and the temperature of a hot plate 4 of a surface temperature source 3 respectively by taking a surface thermometer 2 as a transmission medium, and obtaining the measured temperature t of the standard hot plate 1 1 The measured temperature of the hot plate 4 of the surface temperature source 3 is t 2 Corrected value t of surface thermometer 2 Repair the ＝t-t 1 Based on a correction value t at the temperature t of the surface thermometer 2 Repair the Calibrating the surface temperature source 3 to obtainTo the actual temperature t of the hot plate 4 of the surface temperature source 3 0 ＝t 2 +t Repair the 。
According to the surface temperature source calibration method provided by the embodiment, a standard constant temperature bath 5 is used for heating a standard hot plate 1, compared with resistance heating, the medium is uniform, the temperature control can be more accurate, the temperature uniformity of the standard hot plate 1 is better, the temperature of the standard hot plate 5 is used as the temperature of the standard hot plate 1 to be closer to the true value, the upper surface temperature of the standard hot plate 1 is used as the reference temperature, the temperature of the standard hot plate 1 and the temperature of the hot plate 4 of a surface temperature source 3 are respectively measured by the surface thermometer 2 in a short time, the surface thermometer 2 is a high-stability and high-accuracy surface thermometer, the reference temperature of the standard hot plate 1 and the measured temperature of the standard hot plate 1 by the surface thermometer 2 are used for obtaining the correction value of the surface thermometer 2, the temperature of the standard hot plate 1 and the temperature of the hot plate 4 of the surface temperature source 3 are respectively measured in a short time, the temperature drift of the surface thermometer 2 is considered to be ignored or small, the correction value obtained by placing the standard hot plate 1 is considered to be the same as the correction value when the correction value is on the surface temperature source 3 to be on the detected, and the surface temperature source 3 is not determined accurately, so that the platinum calibration method is adopted, and the problem of the surface temperature correction of the surface temperature source is avoided, and the surface temperature correction of the platinum is more accurate correction of the platinum reduction.
In the present embodiment, a standard platinum resistance thermometer 8 is inserted into the standard thermostatic bath 5, and the measured temperature of the standard platinum resistance thermometer 8 is used as the actual temperature of the standard thermostatic bath 5 to ensure the accuracy of the heating temperature of the standard thermostatic bath 5, wherein the temperature probe of the standard platinum resistance thermometer 8 has the same height as the standard hot plate 1.
In the embodiment, after the standard hot plate 1 is hermetically connected to the bottom of the inner cylinder 9, the bottom end of the inner cylinder 9 is placed in the standard thermostatic bath 5, the standard hot plate 1 is heated, the inner cylinder 9 is made of a high-temperature-resistant heat-insulating material, and the standard hot plate 1 is made of a red copper material. High temperature resistant thermal insulation material can select for use low heat conduction material (for example ceramic material etc.), and standard hot plate 1 also can adopt the material preparation that other heat conductivities are good, and mode sealing connection such as screw thread, glue is passed through to standard hot plate 1 and inner tube 9, and the air that can separate in the inner tube 9 through inner tube 9 and the air of standard thermostatic bath 5 top are to the temperature influence of 5 internal environment of standard thermostatic bath, guarantee that the heating temperature of standard thermostatic bath 5 is even invariable.
As shown in table 1, an example of the calibration of the surface temperature source 3 using the present method is:
table 1 calibration example
In the calibration example 1, the correction value t of the surface thermometer 2 can be derived Repair the ＝t-t 1 =0.0, and the actual temperature of the surface temperature source to be inspected is t from the correction value of the surface thermometer 2 0 ＝t 2 +t Repair the ＝29.96。
In the calibration example 2, the correction value t of the surface thermometer 2 can be obtained Repair the ＝t-t 1 = 0.01, the actual temperature of the examined surface temperature source is obtained as t from the correction value of the surface thermometer 2 0 ＝t 2 +t Repair the ＝99.98。
In calibration example 3, a correction value t of the surface thermometer 2 can be derived Repair the ＝t-t 1 = 0.02, the actual temperature of the surface temperature source to be examined is obtained as t from the correction value of the surface thermometer 2 0 ＝t 2 +t Repair the ＝300.03。
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (4)
1. A surface temperature source calibration method, comprising the steps of:
heating a standard hot plate to a set temperature t and keeping the temperature constant, taking a surface thermometer as a transmission medium, respectively measuring the temperature of the standard hot plate and the temperature of a hot plate of a surface temperature source to obtain the measured temperature t of the standard hot plate 1 The measured temperature of the hot plate of the surface temperature source is t 2 Corrected value t of said surface thermometer Repair the ＝t-t 1 According to the correction value t of said surface thermometer Repair the Calibrating the surface temperature source to obtain the actual temperature t of the hot plate of the surface temperature source 0 ＝t 2+ t Repair the 。
2. The surface temperature source calibration method of claim 1, wherein: the standard hot plate is heated to a set temperature t in a standard thermostatic bath and kept constant.
3. The surface temperature source calibration method according to claim 2, characterized in that: and inserting a standard platinum resistance thermometer into the standard constant temperature bath, and taking the measured temperature of the standard platinum resistance thermometer as the actual temperature of the standard constant temperature bath.
4. The surface temperature source calibration method according to claim 2, characterized in that: and after the standard hot plate is hermetically connected to the bottom of the inner cylinder, the bottom end of the inner cylinder is placed in the standard constant temperature tank, the standard hot plate is heated, the inner cylinder is made of a high-temperature-resistant heat-insulating material, and the standard hot plate is made of a red copper material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315615.4A CN115574979A (en) | 2022-10-26 | 2022-10-26 | Surface temperature source calibration method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211315615.4A CN115574979A (en) | 2022-10-26 | 2022-10-26 | Surface temperature source calibration method |
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| CN115574979A true CN115574979A (en) | 2023-01-06 |
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| CN202211315615.4A Pending CN115574979A (en) | 2022-10-26 | 2022-10-26 | Surface temperature source calibration method |
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- 2022-10-26 CN CN202211315615.4A patent/CN115574979A/en active Pending
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