In-situ calibration method for tobacco online thermodetector

Abstract

The invention specifically discloses an in-situ calibration method for a tobacco online thermodetector, which comprises the following steps: determining an online thermodetector to be measured and a production line point location where the online thermodetector is located, and determining the working temperature t0 and the measurement frequency f0 of the tobacco online thermodetector at the production line point location; the method comprises the following steps: extracting a tobacco material in a range measured by a tobacco online thermodetector on a production line, placing the tobacco material in a heat preservation container, filling the heat preservation container to two thirds of the volume of the heat preservation container, sealing the container, inserting a platinum resistance thermometer to measure the temperature c of the tobacco material in a heat preservation barrel, and recording an initial moment t1; starting to record the measurement result of the tobacco online thermodetector from t1 until the temperature result of the tobacco material in the heat preservation container measured by the platinum resistance thermometer is a stable value, and recording a stable moment t2; and the temperature measurement error delta and the standard deviation sigma of the tobacco online thermodetector are calculated by taking a stable value of the temperature of the tobacco material in the heat preservation container measured by the platinum resistance thermometer as a true value. According to the invention, the accuracy and reliability of the online thermodetector can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of on-line tobacco detection, and more specifically, to an in-situ calibration method for an on-line tobacco thermometer. Background Art

[0002] Existing on-line tobacco thermometers often utilize the principle of infrared radiation to non-contact detect the temperature of tobacco leaves, cut tobacco, tobacco stems, and cut stem in real time. They are usually installed above the material conveyor belt to achieve temperature monitoring and control of tobacco in-process products. However, the reliability of the measured value of the on-line infrared tobacco thermometer is greatly affected by the measurement accuracy of the instrument and needs to be calibrated regularly. Therefore, how to calibrate the on-line thermometer and improve the accuracy and reliability of temperature monitoring in the tobacco industry production line is of great significance. Summary of the Invention

[0003] The present invention provides an in-situ calibration method for an on-line tobacco thermometer, which solves the problems of inconvenience and inaccuracy in the calibration of existing on-line tobacco thermometers, can improve the accuracy and reliability of temperature monitoring in the tobacco industry production line, and provides reliable support for temperature control in the tobacco production process.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] An in-situ calibration method for an on-line tobacco thermometer, comprising:

[0006] Determine the on-line thermometer to be tested and its location on the production line, and clarify the working temperature t 0 and measurement frequency f 0 ;

[0007] Extract the tobacco material within the measurement range of the on-line tobacco thermometer on the production line, place it in a heat-insulating container, fill the container to two-thirds of its volume, then seal the container, and then insert a platinum resistance thermometer to measure the temperature c of the tobacco material in the heat-insulating bucket, and record the initial time t 1 ;

[0008] Starting from t 1 record the measurement results of the on-line tobacco thermometer until the temperature result of the tobacco material in the heat-insulating container measured by the platinum resistance thermometer reaches a stable value, and record the stable time t 2 ;

[0009] Taking the stable value of the temperature of the tobacco material in the heat-insulating container measured by the platinum resistance thermometer as the true value, calculate the temperature measurement error δ and standard deviation σ of the on-line tobacco thermometer.

[0010] Preferably, the calculation of the temperature measurement error δ of the on-line tobacco thermometer includes:

[0011] Obtain the average value avg of the measurement results of the online thermometer, and calculate the temperature measurement error δ according to the formula: , and calculate the temperature measurement error δ.

[0012] Preferably, obtaining the average value avg of the measurement results of the online thermometer includes:

[0013] For the f of the tobacco online thermometer 0 (t 2 - t 1 ) measurement results, eliminate the measurement results beyond the range according to the 3σ principle, and then take the average value of the remaining measurement results as the final temperature measurement result.

[0014] Preferably, obtaining the average value avg of the measurement results of the online thermometer further includes:

[0015] According to the formula: , calculate the average value avg of the measurement results of the online thermometer, where is the i-th measurement result, and m is the number of eliminated measurement results.

[0016] Preferably, calculating the standard deviation σ of the temperature measurement error of the tobacco online thermometer includes:

[0017] Repeat the temperature measurement error δ detection step of the online thermometer multiple times, at least 5 times, and then according to the formula: , calculate the standard deviation σ, where is the temperature measurement error of the tobacco online thermometer obtained in the j-th time, and n is the number of measurements.

[0018] Preferably, the volume of the heat preservation container is greater than 0.008 m 3 .

[0019] Preferably, the heat preservation performance of the volume of the heat preservation container should meet that the temperature fluctuation does not exceed 2°C within 30 minutes after the temperature stabilizes.

[0020] Preferably, the relevant performance indicators of the platinum resistance thermometer are better than those of the online thermometer.

[0021] Preferably, the platinum resistance thermometer adopts a Pt100 type platinum resistance thermometer.

[0022] Preferably, it further includes:

[0023] Calibrate the corresponding online thermometer according to the calculated temperature measurement error and standard deviation.

[0024] The present invention provides an in-situ calibration method for a tobacco online thermometer. The tobacco material within the measurement range of the tobacco online thermometer on the production line is placed in a heat preservation container, and a platinum resistance thermometer is used to compare with the online thermometer to obtain the temperature measurement error and standard deviation, and then the online thermometer is calibrated, solving the problems of inconvenience and inaccuracy in the calibration of existing tobacco online thermometers, improving the accuracy and reliability of temperature monitoring on the production line in the tobacco industry, and providing reliable support for temperature control in the tobacco production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below.

[0026] Figure 1 It is a schematic diagram of an in-situ calibration method for a tobacco online thermometer provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0028] Aiming at the problems of inconvenience and inaccuracy in the calibration of current tobacco online thermometers, the present invention provides an in-situ calibration method for a tobacco online thermometer, solving the problems of inconvenience and inaccuracy in the calibration of existing tobacco online thermometers, improving the accuracy and reliability of temperature monitoring on the production line in the tobacco industry, and providing reliable support for temperature control in the tobacco production process.

[0029] As Figure 1 shown, an in-situ calibration method for a tobacco online thermometer includes:

[0030] S1: Determine the online thermometer to be measured and its location on the production line, and clarify the working temperature t 0 and measurement frequency f 0 ;

[0031] S2: Extract the tobacco material within the measurement range of the tobacco online thermometer on the production line, place it in a heat preservation container, fill the container to two-thirds of its volume and then seal the container, and then insert a platinum resistance thermometer to measure the temperature c of the tobacco material in the heat preservation bucket, and record the initial time t 1 ;

[0032] S3: Start recording the measurement results of the tobacco online thermometer from t 1 until the temperature result of the tobacco material in the heat preservation container measured by the platinum resistance thermometer is a stable value, and record the stable time t 2 ;

[0033] S4: Taking the stable value of the temperature of the tobacco material in the heat preservation container measured by the platinum resistance thermometer as the true value, calculate the temperature measurement error δ and the standard deviation σ of the on-line tobacco thermometer.

[0034] Specifically, use a platinum resistance thermometer and an on-line thermometer to measure the temperature of the corresponding material at the same point on the same production line simultaneously, compare the readings of the two, so as to obtain the temperature measurement error and standard deviation of the on-line thermometer, and calibrate the on-line thermometer. This method uses a platinum resistance thermometer to accurately measure the temperature of the tobacco material in the heat preservation container and compares it with the data of the on-line thermometer. Through multiple repeated tests and adopting data screening and error elimination strategies, the accuracy and reliability of the calibration results are improved. This method can effectively reduce the temperature measurement error, is applicable to the production line temperature monitoring equipment in the tobacco industry, has high precision and convenience, and provides reliable support for the temperature control in the tobacco production process.

[0035] Further, the calculation of the temperature measurement error δ of the on-line tobacco thermometer includes:

[0036] Obtain the average value avg of the measurement results of the on-line thermometer. According to the formula: , calculate the temperature measurement error δ.

[0037] Further, the obtaining of the average value avg of the measurement results of the on-line thermometer includes:

[0038] The f 0 (t 2 -t 1 ) measurement results of the on-line tobacco thermometer, eliminate the measurement results beyond the range according to the 3σ principle, and then take the average value of the remaining measurement results as the final temperature measurement result.

[0039] Further, the obtaining of the average value avg of the measurement results of the on-line thermometer also includes:

[0040] According to the formula: , calculate the average value avg of the measurement results of the on-line thermometer, where is the i-th measurement result and m is the number of eliminated measurement results.

[0041] Further, the calculation of the standard deviation σ of the temperature measurement error of the on-line tobacco thermometer includes:

[0042] Repeat the temperature measurement error δ detection step of the on-line thermometer multiple times, at least 5 times, and then according to the formula: , calculate the standard deviation σ, where is the temperature measurement error of the on-line tobacco thermometer obtained in the j-th time and n is the number of measurements.

[0043] Further, the volume of the heat preservation container needs to be greater than 0.008 m 3 .

[0044] Further, the heat preservation performance of the volume of the heat preservation container should meet that the temperature fluctuation does not exceed 2°C within 30 minutes after the temperature stabilizes.

[0045] Further, the relevant performance indicators of the platinum resistance thermometer are better than those of the on-line temperature measuring instrument.

[0046] Further, the platinum resistance thermometer adopts a Pt100 type platinum resistance thermometer.

[0047] This method further includes: calibrating the corresponding on-line temperature measuring instrument according to the calculated temperature measurement error and standard deviation.

[0048] In one embodiment, the test site is located at the Golden Leaf Production Center in Zhengzhou City, Henan Province, and the test point is selected after the 5000 brand line is loosened and rehumidified.

[0049] Step 1: Select a test point. The on-line temperature measuring instrument at this point measures the temperature once every second, and determine the tobacco material area measured by the on-line temperature measuring instrument at this point.

[0050] Step 2: Take out the tobacco materials in the determined area and place them in the heat preservation container, seal the heat preservation container, and record the time t at this time 1 .

[0051] Step 3: Start recording the temperature of the on-line temperature measuring instrument, and at the same time observe the temperature value displayed by the platinum resistance thermometer. After the temperature value measured by the platinum resistance thermometer is stable, record the time at this time as t 2 ;

[0052] Step 4: Repeat Step 1 to Step 3, and conduct a total of 5 groups of repeatability tests. Each group of tests is set as d 1 ~d 5 . Record the values measured by the on-line temperature measuring instrument as shown in Table 1:

[0053]

[0054] The values measured by the platinum resistance thermometer in the heat preservation container are shown in Table 2:

[0055]

[0056] Step 5: Conduct relevant processing on the data. First, screen out gross errors according to the 3σ principle, and it is found that there is no data containing gross errors. Secondly, calculate the average value of each group as the measured value of the tobacco materials during this measurement period, and its value is shown in Table 3:

[0057]

[0058] Step 6: Consider the temperature of the tobacco material in the heat preservation container measured by the platinum resistance thermometer as the true value, calculate the measurement error for each group, and the relevant data is shown in Table 4. Based on the relevant formula, calculate the standard deviation of its data. Finally, the standard deviation of the measured value of the online temperature measuring instrument is: 0.031°C.

[0059]

[0060] In the actual application of the calibration method proposed in the above embodiments, by combining the platinum resistance thermometer with the heat preservation container, a stable measurement environment is constructed, and the accurate calibration of the tobacco online temperature measuring instrument is realized by using the data comparison and error elimination strategy. The multiple repeated tests and related deviation analysis adopted during the calibration process effectively reduce the calibration error and ensure the reliability and accuracy of the calibration results. During the execution of this method, based on the calibration logic of comparative measurement and refined data processing, not only the credibility of the calibration is improved, but also the temperature measurement accuracy of the online temperature measuring instrument during the actual operation of the production line is ensured, meeting the strict requirements of the tobacco production process for temperature control.

[0061] It can be seen that the present invention provides an in-situ calibration method for a tobacco online temperature measuring instrument. The tobacco material within the measurement range of the tobacco online temperature measuring instrument on the production line is placed in a heat preservation container, and a platinum resistance thermometer is used to compare with the online temperature measuring instrument to obtain the temperature measurement error and standard deviation, and then calibrate the online temperature measuring instrument, solving the problems of inconvenience and inaccuracy in the calibration of the existing tobacco online temperature measuring instrument, improving the accuracy and reliability of the temperature monitoring of the production line in the tobacco industry, and providing reliable support for the temperature control during the tobacco production process.

[0062] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Any person skilled in the art can smoothly implement the present invention according to the instructions in the drawings and the above description. However, any equivalent changes made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above, such as minor modifications, decorations, and evolutions, are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An in-situ calibration method for a tobacco online thermometer, characterized in that: include: Determine the online thermometer to be tested and the production line point where it is located, and clarify the working temperature t0 and measurement frequency f0 of the tobacco online thermometer at the production line point; Extract tobacco materials within the measuring range of the tobacco online thermometer on the production line, place them in an insulation container, fill the insulation container to two-thirds of its volume and seal the container, then insert a platinum resistance thermometer to measure the temperature c of the tobacco materials in the insulation barrel, and record the initial time t1; Record the measurement results of the tobacco online thermometer from t1 until the temperature of the tobacco material in the insulation container measured by the platinum resistance thermometer reaches a stable value, and record the stable time t2; Taking the stable value of the temperature of the tobacco material in the insulation container measured by the platinum resistance thermometer as the true value, the temperature measurement error δ and standard deviation σ of the tobacco online temperature measuring instrument are calculated.

2. The in-situ calibration method for a tobacco online temperature measuring instrument according to claim 1, characterized in that: The calculation to obtain the temperature measurement error δ of the tobacco online temperature measuring instrument includes: Get the average value avg of the online thermometer measurement results, according to the formula: , the temperature measurement error δ is calculated.

3. The in-situ calibration method for a tobacco online thermometer according to claim 2, characterized in that: The step of obtaining the average value avg of the measurement result of the online temperature measuring instrument includes: The f0 (t2-t1) measurement results of the tobacco online temperature meter are eliminated according to the 3σ principle, and then the average value of the remaining measurement results is taken as the final temperature measurement result.

4. The in-situ calibration method for an online tobacco thermometer according to claim 3, characterized in that: The step of obtaining the average value avg of the measurement result of the online temperature measuring instrument further includes: According to the formula: , calculate the average value avg of the online temperature measurement results, where, is the i-th measurement result, and m is the number of eliminated measurement results.

5. The in-situ calibration method for an online tobacco thermometer according to claim 4, characterized in that: The standard deviation σ of the temperature measurement error of the tobacco online thermometer is calculated, including: The temperature measurement error δ detection step of the online thermometer is repeated for multiple times, at least 5 times, and then according to the formula: , calculate the standard deviation σ, where is the temperature measurement error of the tobacco online thermometer obtained for the jth time, and n is the number of measurements.

6. The in-situ calibration method for an online tobacco thermometer according to claim 5, characterized in that: The volume of the thermal insulation container is greater than 0.008 m 3 .

7. The in-situ calibration method for an online tobacco thermometer according to claim 6, characterized in that: The thermal insulation performance of the thermal insulation container volume should meet the requirement that the temperature fluctuation does not exceed 2°C within 30 minutes after the temperature is stabilized.

8. The in-situ calibration method for an online tobacco thermometer according to claim 7, characterized in that: The relevant performance indicators of the platinum resistance thermometer are better than those of the online temperature measuring instrument.

9. The in-situ calibration method for an online tobacco thermometer according to claim 8, characterized in that: The platinum resistance thermometer is a Pt100 type platinum resistance thermometer.

10. The in-situ calibration method for an online tobacco thermometer according to claim 9, characterized in that: Also includes: The corresponding online temperature measuring instrument is calibrated according to the calculated temperature measurement error and standard deviation.

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