CN113654691A - Soil temperature sensor calibration instrument and calibration method - Google Patents
Soil temperature sensor calibration instrument and calibration method Download PDFInfo
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- CN113654691A CN113654691A CN202010396879.1A CN202010396879A CN113654691A CN 113654691 A CN113654691 A CN 113654691A CN 202010396879 A CN202010396879 A CN 202010396879A CN 113654691 A CN113654691 A CN 113654691A
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- 239000002689 soil Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a soil temperature sensor calibrating instrument and a soil temperature sensor calibrating method, wherein the soil temperature sensor calibrating instrument comprises a detection box, a sensor to be measured and a standard sensor, wherein the standard sensor is a temperature sensor which is actually measured and has higher precision, the sensor to be measured is a temperature sensor needing to be calibrated, and the interior of the detection box is divided into at least three independent detection cavities; a heat conducting piece is arranged in each detection cavity respectively, the heat conducting piece generates heat after being electrified, and the vacant part of each detection cavity is filled with soil; during detection, the sensor to be measured and the standard sensor are respectively inserted into each detection cavity, and then the measured values of the sensor to be measured and the standard sensor are respectively obtained to be used as calibration bases. The method is quick and convenient, low in cost and easy to operate, and can assist workers in quickly calibrating the sensor to be calibrated. The invention has high working efficiency and simple design, and can greatly reduce the operation cost of calibrating the soil temperature sensor.
Description
Technical Field
The invention relates to a sensor calibration technology, in particular to a calibration instrument and a calibration method of a soil temperature sensor.
Background
In the agricultural field, the temperature of soil is often required to be measured, but a certain error exists between the measured value of a soil temperature sensor on the market and the actual soil temperature, so that an efficient and accurate calibration instrument needs to be selected to calibrate the temperature measured value of the temperature sensor.
However, there is no relevant device or method in the market to calibrate the measurement accuracy of the soil temperature sensor, so the applicant proposes a calibration instrument and a calibration method for a soil temperature sensor, which can realize more accurate calibration of the temperature sensor.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a calibration apparatus and a calibration method for a soil temperature sensor.
In order to achieve the purpose, the invention provides a soil temperature sensor calibrating instrument, which comprises a detection box, a sensor to be measured and a standard sensor, wherein the standard sensor is a temperature sensor which is actually measured and has higher precision, the sensor to be measured is a temperature sensor needing to be calibrated, and the inside of the detection box is divided into at least three independent detection cavities; a heat conducting piece is arranged in each detection cavity respectively, the heat conducting piece generates heat after being electrified, and the vacant part of each detection cavity is filled with soil; during detection, the sensor to be measured and the standard sensor are respectively inserted into each detection cavity, and then the measured values of the sensor to be measured and the standard sensor are respectively obtained to be used as calibration bases.
As the preferred technical scheme of the invention, the heat conducting piece adopts an electric heating rod which is powered by a lead.
As a preferred technical scheme of the invention, the device also comprises a supporting disc, wherein the supporting disc is circular, a heating hole is arranged at the position of the circle center of the supporting disc, at least two mounting holes are arranged at the middle position of the supporting disc, and the mounting holes are distributed on the same circle taking the axis of the heating hole as the circle center; the sensor to be measured and the standard sensor are respectively arranged in the two mounting holes, and the heat conducting piece is arranged in the heating hole; at least one supporting disc is arranged in each detection cavity.
As a preferred technical scheme of the invention, the supporting disc has at least an upper layer and a lower layer, the two layers of supporting discs are fixedly connected through the connecting rod, and the supporting disc, the connecting rod and the heat conducting piece are assembled and then installed in the detection cavity and then filled with soil.
As a preferred technical scheme of the invention, marks are arranged on probes of a sensor to be measured and a standard sensor at the same insertion depth, and then the probes of the sensor to be measured and the standard sensor respectively penetrate through mounting holes of two layers of supporting disks, so that the marks are flush with the top surface of the supporting disk on the upper layer.
As a preferable technical solution of the present invention, there are at least two standard sensors, and when in use, if the measured values of the plurality of standard sensors are within the error range, the average value of the measured values of the plurality of standard sensors is taken as T; once the measured values of the plurality of standard sensors exceed the error values, the test is determined to be failed, and the test is stopped to check whether the test operation is normal or whether the standard sensors are normal.
The invention also discloses a method for calibrating the soil temperature sensor, which comprises the following steps:
1) the heat conducting members in each detection cavity are respectively electrified, so that the soil in each detection cavity is respectively heated;
2) then, inserting a sensor to be measured and a standard sensor into each detection cavity respectively, and measuring the temperature of the soil in each detection cavity through the sensor to be measured and the standard sensor respectively, wherein the value output by the sensor to be measured is T, and the value output by the standard sensor 220 is T;
3) generating three groups of data (T, T) through the step 2), calculating the calibration value of the sensor to be measured by adopting a least square method, and writing the calibration value back to the sensor to be measured for calibration.
In a preferred embodiment of the present invention, the heat-conducting members in the detection chambers generate different amounts of heat, and thus different temperature differences are formed.
The invention has the beneficial effects that:
the method is quick and convenient, low in cost and easy to operate, and can assist workers in quickly calibrating the sensor to be calibrated. The invention has high working efficiency and simple design, and can greatly reduce the operation cost of calibrating the soil temperature sensor.
The invention discloses a novel temperature sensor calibration instrument and a novel temperature sensor calibration method, wherein the temperature coefficient and the temperature deviation value of a sensor to be measured are generated by comparing and calculating the measurement values of the sensor to be measured and a standard sensor, and then the temperature value of the sensor to be measured can be calibrated according to the parameter value.
Drawings
FIG. 1 is a schematic view of a calibration apparatus of the present invention in use.
Fig. 2 is a schematic view of the structure of the support disk of the present invention.
Fig. 3 is a schematic view of the usage state of the support disc of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 3, a soil temperature sensor calibrating instrument includes a detection box 100, a sensor to be measured 210, and a standard sensor 220, where the standard sensor 220 is a temperature sensor which has higher precision through actual measurement, and the sensor to be measured 210 is a temperature sensor which needs to be calibrated;
the interior of the detection box 100 is divided into three independent detection cavities 101; the heat conducting members 310 are respectively installed in each detection cavity 101, the heat conducting members 310 generate heat after being electrified, and the vacant parts of each detection cavity 101 are filled with soil 110. The heat-conducting member 310 may be an electric bar, which is powered by the wire 320.
When the device is used, each heat conduction member 310 is electrified so as to heat the soil in each detection cavity 101, and in the embodiment, the heat conduction members 310 in each detection cavity generate different heat, so that different temperature differences are formed. Then inserting a sensor to be measured 210 and a standard sensor 220 into each detection cavity 101 respectively, so as to measure the temperature of the soil in each detection cavity 101 through the sensor to be measured 210 and the standard sensor 220 respectively, wherein the value output by the sensor to be measured 210 is T, and the value output by the standard sensor 220 is T;
through the steps, three groups of data (T, T) are generated, then a linear equation of two elements generated by the three groups of data is solved, and the temperature coefficient value a and the temperature deviation value b are obtained. Therefore, the measured value of the sensor to be measured can be calibrated according to the temperature coefficient value a and the temperature deviation value b.
Preferably, based on a single-factor variable experiment concept, in order to prevent a large error caused by different insertion positions and different time of the sensor 210 to be measured, the standard sensor 220 and soil in each detection cavity, a supporting plate 410 is further added in the embodiment, the supporting plate 410 is circular, a heating hole 412 is formed in the position of the circle center of the supporting plate 410, at least two mounting holes 411 are formed in the middle of the supporting plate, and the mounting holes 411 are distributed on the same circle with the axis of the heating hole 412 as the circle center; the sensor 210 to be measured and the standard sensor 220 are respectively installed in the two installation holes 411, and the heat conductive member 310 is installed in the heating hole 412. This design makes the axial distance between the heating hole axis and the mounting hole 411 the same, which can prevent the sensor 210 to be measured, the standard sensor 220 and the sensor from being greatly different from the position of the heat-conducting member 310 to cause larger error.
Preferably, the supporting disc 410 has an upper layer and a lower layer, the two layers of supporting discs are connected and fixed through a connecting rod 420, and the supporting disc 410, the connecting rod 420 and the heat conducting member 310 are assembled and then installed in the detection cavity, and then filled with soil.
When the tool is used, marks are arranged on the probes of the sensor 210 to be measured and the standard sensor 220 at the same insertion depth, then the probes of the sensor 210 to be measured and the standard sensor 220 respectively penetrate through the mounting holes 411 of the two supporting plates 410, so that the marks are flush with the top surface of the supporting plate at the upper layer, and at the moment, the insertion angles and the depths of the probes of the sensor 210 to be measured and the standard sensor 220 are judged to be consistent, thereby ensuring that no variable is generated at the positions and improving the detection precision.
Preferably, the number of the standard sensors 220 may be two or more, and when the standard sensors 220 and the sensor to be measured 210 are used simultaneously, when the measured values of the plurality of standard sensors 220 are within the error range, the average value of the measured values of the plurality of standard sensors 220 is taken as T; once the measured values of the plurality of standard sensors 220 exceed the error value, the test is determined to be failed, and the test is stopped to check whether the experimental operation is normal or whether the standard sensors 220 are normal. Therefore, the error is automatically corrected, and the calibration precision is improved.
The specific application method of this example is as follows:
(one) hold suitable amount of pure water to the three detection chamber of instrument, through an electric current to heat conduction spare (directional heat conduction material), the heat in at this moment three detection intracavity will be followed one end and moved to the other end to can form certain temperature difference in 3 detection chambeies.
The current temperature in the current 3 detection cavities can be acquired through the standard sensor, then the current of the directional heat conduction material is controlled to control the temperature in the 3 detection cavities at a stable level, and the temperature difference in the 3 detection cavities is not lower than 10 ℃.
And (III) placing the sensors 210 to be measured in the three detection cavities respectively, and recording a plurality of groups of temperature values T measured by the sensors 210 to be measured and measurement values T of the standard sensors.
And (IV) generating a plurality of groups of data (T, T) through the steps, calculating the calibration value of the sensor to be measured by adopting a least square method, and writing the calibration value back to the sensor to be measured 210 for calibration.
The invention is not described in detail, but is well known to those skilled in the art.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. A soil temperature sensor calibrating instrument comprises a detection box, a sensor to be measured and a standard sensor, wherein the standard sensor is a temperature sensor which is actually measured and has higher precision, and the sensor to be measured is a temperature sensor to be calibrated; a heat conducting piece is arranged in each detection cavity respectively, the heat conducting piece generates heat after being electrified, and the vacant part of each detection cavity is filled with soil; during detection, the sensor to be measured and the standard sensor are respectively inserted into each detection cavity, and then the measured values of the sensor to be measured and the standard sensor are respectively obtained to be used as calibration bases.
2. The calibration instrument of claim 1 wherein the thermally conductive member is an electrically heated rod that is electrically powered by a wire.
3. The calibration instrument of claim 1, further comprising a support plate, wherein the support plate is circular and has a heating hole at a center position and at least two mounting holes at a middle position, and the mounting holes are distributed on a same circle with the axis of the heating hole as a center; the sensor to be measured and the standard sensor are respectively arranged in the two mounting holes, and the heat conducting piece is arranged in the heating hole; at least one supporting disc is arranged in each detection cavity.
4. The calibration instrument according to claim 3, wherein the support plate has at least two layers, the two layers are connected and fixed by a connecting rod, and the support plate, the connecting rod and the heat conducting member are assembled and installed in the detection chamber, and then filled with soil.
5. The calibration instrument according to claim 4, wherein the sensor to be measured and the probe of the standard sensor are provided with marks at the same insertion depth, and then the probes of the sensor to be measured and the standard sensor are respectively inserted through the mounting holes of the two support plates, so that the marks are flush with the top surface of the support plate of the previous layer.
6. A calibration instrument according to claim 5 wherein there are at least two of said standard sensors, and in use if the measured values of the plurality of standard sensors are within the error range, then taking the average of the measured values of the plurality of standard sensors as T; once the measured values of the plurality of standard sensors exceed the error values, the test is determined to be failed, and the test is stopped to check whether the test operation is normal or whether the standard sensors are normal.
7. A method for calibrating a soil temperature sensor, comprising the steps of:
the heat conducting members in each detection cavity are respectively electrified, so that the soil in each detection cavity is respectively heated;
then respectively inserting a sensor to be measured and a standard sensor into each detection cavity, and respectively measuring the temperature of the soil in each detection cavity through the sensor to be measured and the standard sensor, wherein the value output by the sensor to be measured is T, and the value output by the standard sensor is T;
generating three groups of data (T, T) through the step 2), calculating the calibration value of the sensor to be measured by adopting a least square method, and writing the calibration value back to the sensor to be measured for calibration.
8. The calibration method according to claim 7, wherein the heat-conducting members in each of the detection chambers are heated in different amounts, thereby forming different temperature differences.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010396879.1A CN113654691B (en) | 2020-05-12 | 2020-05-12 | Calibration instrument and calibration method for soil temperature sensor |
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| CN202010396879.1A CN113654691B (en) | 2020-05-12 | 2020-05-12 | Calibration instrument and calibration method for soil temperature sensor |
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| CN113654691B CN113654691B (en) | 2024-06-04 |
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