Fiber bragg grating temperature sensor calibration temperature setting and temperature stability evaluation method

Abstract

The invention relates to a fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, and belongs to the technical field of optical fiber sensing. A fiber bragg grating temperature sensor temperature test system is built and comprises a fiber bragg grating temperature sensor, a temperature equalizing plate, an anti-static disc, an anti-static upper cover, a platinum resistor, a high-low temperature test box, a temperature acquisition instrument and a computer; the uniform temperature plate is placed on the anti-static disc; the fiber bragg grating temperature sensor is fixedly arranged on the uniform temperature plate; the platinum resistor is fixed on the vapor chamber; covering the anti-static disc with an anti-static upper cover, putting the anti-static disc into a high-low temperature test box, and connecting a platinum resistor with a temperature acquisition instrument and a computer in sequence; setting a test temperature, and collecting temperature data; evaluating the temperature stability; according to the temperature acquisition method, the data acquisition stability of the equipment is improved, the generation probability of untrusted data is reduced, and the data processing efficiency and reliability are improved. Through a temperature stability evaluation method, segmented evaluation of temperature data is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical fiber sensing, and relates to a temperature calibration and setting method and a temperature stability evaluation method for a fiber grating temperature sensor. BACKGROUND

[0002] The fiber grating temperature sensor is a string structure, and multiple sensors are connected and signal-transmitted through one optical fiber. When temperature calibration is performed, multiple sensors on one optical fiber need to be calibrated at the same time, and batch calibration is required. The high-low temperature test box is a commonly used test device, has low cost, is easy to obtain, can be used as a temperature calibration device for the sensor, and can realize batch production. However, compared with the constant-temperature water bath, the constant-temperature oil bath and the semiconductor temperature control device, the temperature control precision of the high-low temperature test box is slightly poor. How to use the high-low temperature test box to realize the same temperature control precision is a difficult problem to be studied at present. SUMMARY

[0003] The technical problem solved by the application is to overcome the shortcomings of the prior art, and to provide a temperature calibration and setting method and a temperature stability evaluation method for a fiber grating temperature sensor. The temperature acquisition method improves the stability of the data collected by the device, reduces the probability of generating untrusted data, and improves the data processing efficiency and reliability. The temperature stability evaluation method realizes segmented evaluation of temperature data.

[0004] The technical solution of the application is as follows:

[0005] The temperature calibration and setting method and the temperature stability evaluation method for the fiber grating temperature sensor comprise the following steps:

[0006] A temperature test system for the fiber grating temperature sensor is built, which comprises a fiber grating temperature sensor, a uniform temperature plate, an anti-static disc, an anti-static upper cover, a platinum resistance, a high-low temperature test box, a temperature acquisition instrument and a computer. The uniform temperature plate is placed on the anti-static disc. The fiber grating temperature sensor is fixedly installed on the uniform temperature plate. The platinum resistance is fixed on the uniform temperature plate. After the anti-static upper cover is covered on the anti-static disc, the anti-static upper cover is placed in the high-low temperature test box. The platinum resistance is sequentially connected to the temperature acquisition instrument and the computer.

[0007] The test temperature is set, and the temperature data is collected.

[0008] The temperature stability is evaluated according to the temperature data.

[0009] In the above-mentioned temperature calibration and setting method and the temperature stability evaluation method for the fiber grating temperature sensor, the platinum resistance is fixed at the center position of the uniform temperature plate by means of a paper adhesive tape. The inner cavity of the anti-static disc is filled with a heat insulation material. The heat insulation material is degreasing cotton.

[0010] In the fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, the temperature test content of the fiber grating temperature sensor includes temperature rising test and temperature falling test.

[0011] In the fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, the test temperature setting for the temperature rising test is:

[0012] 20℃ is taken as the starting temperature point, the temperature point is gradually increased, and temperature collection is carried out at each temperature point, until 60℃ is reached, and the temperature rising test is completed.

[0013] In the fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, the temperature change step during the temperature rising test is 5℃ or 10℃; the temperature holding time is 2.5-3.5 hours.

[0014] In the fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, the test temperature setting for the temperature falling test is:

[0015] 20℃ is taken as the starting temperature point, the temperature point is gradually decreased, and temperature collection is carried out at each temperature point, until -60℃ is reached, and the temperature falling test is completed.

[0016] In the fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, the temperature change step during the temperature falling test is -5℃ or -10℃; the temperature holding time is 2.5-3.5 hours.

[0017] In the fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, the time interval for temperature collection is 2 minutes, and continuous collection is carried out.

[0018] In the fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, the method for evaluating the temperature stability according to the temperature data is:

[0019] The temperature collection data is divided into n groups; n is a positive integer not less than 2;

[0020] The range of temperature collection data in each group is calculated; the n groups are compared to obtain the minimum value of the range of temperature collection data in the n groups;

[0021] The platinum resistance temperature corresponding to the minimum value of the range is taken as the temperature of the uniform temperature plate; and the temperature stability is judged:

[0022] When the minimum value of the range is greater than 0.01℃, it is judged that the temperature is unstable; otherwise, it is judged that the temperature is stable.

[0023] In the fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, the range is the difference between the maximum value and the minimum value in each group of temperature collection data.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] (1) The present application improves the stability of data collected by the equipment, reduces the probability of generating unreliable data, and improves the data processing efficiency and reliability through the temperature collection method.

[0026] (2) The present application realizes the segmented evaluation of temperature data through the temperature stability evaluation method, and takes the minimum value of the temperature range of each segment of platinum resistance as the temperature stability measurement index.

[0027] (3) The present application takes room temperature (20℃) as the zero point of temperature setting, sets the temperature higher than 20℃ as the temperature setting of the heating program, and sets the temperature lower than 20℃ as the temperature setting of the cooling program, so that the calibration process is maximized to approach the natural actual state. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The present application provides a fiber grating temperature sensor calibration temperature setting and temperature stability evaluation flowchart. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with examples.

[0030] The present application provides a fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, which reduces the temperature impact during temperature conversion through the temperature setting of the test box, takes room temperature (20℃) as the zero point of temperature setting, sets the temperature higher than 20℃ as the temperature setting of the heating program, and sets the temperature lower than 20℃ as the temperature setting of the cooling program, so that the calibration process is maximized to approach the natural actual state. The present application improves the stability of data collected by the equipment, reduces the probability of generating unreliable data, and improves the data processing efficiency and reliability through the temperature collection method. The present application realizes the segmented evaluation of temperature data through the temperature stability evaluation method, and takes the minimum value of the temperature range of each segment of platinum resistance as the temperature stability measurement index. The temperature stability in a fixed time period can reach less than 0.01℃.

[0031] The fiber grating temperature sensor is a string structure, a plurality of sensors are connected and signal transmitted through one optical fiber, when temperature calibration, the plurality of sensors on one optical fiber need to be calibrated at the same time, and batch calibration can be carried out; the temperature impact during temperature conversion is reduced by setting the temperature of the test box; the stability of the collected data is improved by the temperature collection method, the probability of generating untrusted data is reduced, and the data processing efficiency and reliability are improved; the temperature data is evaluated in sections by the temperature stability evaluation method, the data processing efficiency is improved, the temperature stability is less than 0.01℃ in a fixed time period (for example, 30 minutes), and the same temperature control effect as that of a constant temperature water bath, a constant temperature oil bath and a semiconductor temperature control device is achieved.

[0032] The fiber grating temperature sensor calibration temperature setting and temperature stability evaluation method, as shown in Figure 1 The specific steps include the following steps:

[0033] A fiber grating temperature sensor temperature test system is built, which includes a fiber grating temperature sensor, a uniform temperature plate, an anti-static disc, an anti-static upper cover, a platinum resistance, a high-low temperature test box, a temperature collection instrument and a computer; the uniform temperature plate is placed on the anti-static disc; the fiber grating temperature sensor is fixedly installed on the uniform temperature plate; the platinum resistance is fixed on the uniform temperature plate; after the anti-static upper cover is covered on the anti-static disc, the anti-static upper cover is put into the high-low temperature test box, and the platinum resistance is sequentially connected with the temperature collection instrument and the computer.

[0034] The platinum resistance is fixed at the center position of the uniform temperature plate by a paper adhesive tape; a heat insulation material is filled in the inner cavity of the anti-static disc; the heat insulation material is degreasing cotton.

[0035] The test temperature is set, and temperature data is collected.

[0036] The temperature test content of the fiber grating temperature sensor includes temperature rising test and temperature falling test.

[0037] The test temperature setting for the temperature rising test is as follows:

[0038] 20℃ is taken as a starting temperature point, the temperature point is gradually increased, temperature collection is carried out at each temperature point, and the temperature rising test is completed until 60℃ is reached. The temperature change step length is 5℃ or 10℃ during the temperature rising test; the temperature holding time is 2.5-3.5 hours.

[0039] The test temperature setting for the temperature falling test is as follows:

[0040] 20℃ is taken as a starting temperature point, the temperature point is gradually decreased, temperature collection is carried out at each temperature point, and the temperature falling test is completed until-60℃ is reached. The temperature change step length is-5℃ or-10℃ during the temperature falling test; the temperature holding time is 2.5-3.5 hours.

[0041] The temperature collection interval is 2 minutes, and the collection is continuous.

[0042] The temperature stability is evaluated according to the temperature data.

[0043] The method for evaluating the temperature stability according to the temperature data is:

[0044] The temperature collection data is divided into n groups; n is a positive integer not less than 2.

[0045] The range of each group of temperature collection data is calculated; the n groups are compared to obtain the minimum range of the n groups of temperature collection data. The range is the difference between the maximum value and the minimum value of each group of temperature collection data.

[0046] The platinum resistance temperature corresponding to the minimum range is taken as the temperature of the vapor chamber, and the temperature stability is judged.

[0047] When the minimum range is greater than 0.01 DEG C, it is judged that the temperature is unstable; otherwise, it is judged that the temperature is stable.

[0048] The present application sets the temperature collection interval according to the reasonable control of data collection quantity, avoids the idea that more data is better, reasonably selects the data segmentation length according to the sensor characteristics, determines the segmentation length through the data cycle collection times and the standard deviation of the data at a fixed temperature, and calculates the temperature range of each segment to take the minimum range as the temperature stability measurement index.

[0049] The present application improves the stability of the collected data of the equipment, reduces the probability of generating unreliable data, and improves the data processing efficiency and reliability.

[0050] The present application realizes the segmented evaluation of the temperature data through the temperature stability evaluation method, and takes the minimum value of the platinum resistance temperature range of each segment as the temperature stability measurement index.

[0051] The present application takes room temperature (20 DEG C) as the zero point of the temperature setting, sets the temperature higher than 20 DEG C as the temperature setting of the heating program, and sets the temperature lower than 20 DEG C as the temperature setting of the cooling program, so that the calibration process is closest to the natural actual state.

[0052] Although the present application has been disclosed with reference to the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the present application by using the disclosed methods and technical contents without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not depart from the technical solutions of the present application, belongs to the protection scope of the technical solutions of the present application.

Claims

1. A method for setting calibration temperature and evaluating temperature stability of a fiber Bragg grating temperature sensor, characterized in that: include: A fiber Bragg grating temperature sensor temperature testing system is constructed, including a fiber Bragg grating temperature sensor, a vapor chamber, an anti-static tray, an anti-static cover, a platinum resistance thermometer, a high and low temperature test chamber, a temperature acquisition instrument, and a computer. The vapor chamber is placed on the anti-static tray; the fiber Bragg grating temperature sensor is fixedly mounted on the vapor chamber; the platinum resistance thermometer is fixed on the vapor chamber; after covering the anti-static tray with the anti-static cover, it is placed in the high and low temperature test chamber, and the platinum resistance thermometer is connected to the temperature acquisition instrument and the computer in sequence. Set the test temperature and collect temperature data; Temperature stability is evaluated based on temperature data.

2. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 1, characterized in that: The platinum resistance thermometer is fixed to the center of the temperature distribution plate using paper tape; the inner cavity of the antistatic plate is filled with heat insulation material, which is degreased cotton.

3. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 1, characterized in that: The temperature testing of fiber Bragg grating temperature sensors includes both heating and cooling tests.

4. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 3, characterized in that: The test temperature for the temperature rise test is set as follows: Starting at 20℃, the temperature was gradually increased, and the temperature was kept warm at each temperature point while temperature data was collected until 60℃ was reached, thus completing the temperature rise test.

5. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 4, characterized in that: The temperature change step during the heating test is 5℃ or 10℃; the holding time is 2.5-3.5 hours.

6. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 3, characterized in that: The test temperature for the cooling test was set as follows: The starting temperature was 20℃. The temperature was gradually lowered, and the temperature was kept warm at each temperature point while temperature data was collected until it reached -60℃, thus completing the cooling test.

7. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 6, characterized in that: The temperature change step during the cooling test is -5℃ or -10℃; the heat preservation time is 2.5-3.5 hours.

8. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 4 or 6, characterized in that: Temperature data was collected every 2 minutes, continuously.

9. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 4 or 6, characterized in that: The method for evaluating temperature stability based on temperature data is as follows: The temperature data is divided into n groups; n is a positive integer not less than 2. Calculate the range of each group of temperature data; compare n groups and find the minimum range of the n groups of temperature data. The temperature of the platinum resistance thermometer corresponding to the minimum range is taken as the temperature of the heat spreader; and the temperature stability is then determined. When the minimum range is greater than 0.01℃, the temperature is considered unstable; otherwise, the temperature is considered stable.

10. The method for setting the calibration temperature and evaluating the temperature stability of a fiber Bragg grating temperature sensor according to claim 9, characterized in that: The range is the difference between the maximum value and the minimum value in each group of temperature data.

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