CN115752791A - Multi-NTC probe structure based on temperature prediction and temperature measuring method thereof - Google Patents
Multi-NTC probe structure based on temperature prediction and temperature measuring method thereof Download PDFInfo
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- CN115752791A CN115752791A CN202211376484.0A CN202211376484A CN115752791A CN 115752791 A CN115752791 A CN 115752791A CN 202211376484 A CN202211376484 A CN 202211376484A CN 115752791 A CN115752791 A CN 115752791A
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- 239000000523 sample Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 14
- 239000010949 copper Substances 0.000 claims abstract description 14
- 239000002470 thermal conductor Substances 0.000 claims abstract description 3
- 239000004020 conductor Substances 0.000 claims description 9
- 238000009529 body temperature measurement Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 239000002937 thermal insulation foam Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
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Abstract
The invention discloses a multi-NTC probe structure based on temperature prediction and a temperature measuring method thereof, wherein the probe comprises: a plurality of NTC probes, a copper housing, a metal support structure, wires, and a thermal conductor; the method comprises the following steps: step 1, in m NTC probes, respectively obtaining the temperature T measured at equal time intervals by each NTC probe 0 、T 1 、……、T n N represents the serial number of the collection temperature; step 2, calculating the temperature difference v acquired by adjacent temperature measuring time n ＝T n ‑T n‑1 (ii) a Step 3, calculating parameter alpha = v n /v n‑1 (ii) a Step 4, calculating the predicted temperature T of the single probe p ＝T n‑1+ v n V (1-. Alpha.); step 5, calculating the measured temperature T b . The invention can further reduce errors and has better general applicability.
Description
Technical Field
The invention relates to the technical field of temperature measurement, in particular to a multi-NTC probe structure based on temperature prediction and a temperature measurement method thereof.
Background
With the mature technology and the improved precision of the NTC thermistor, the application of the NTC thermistor is more and more extensive. In addition to industrial applications, there are also many applications in the field of life, such as applications in biological thermometry for human/animal use.
In order to improve the measurement accuracy, a plurality of thermistors (probes) can be used for measuring the same heat source, and then the measured value is processed to obtain a result which is as close to the true value as possible. In an actual circuit, thermal contact resistance exists among all thermistors, so that temperature difference exists among all thermistors, and the measured temperature is different from the actual temperature.
In the prior art, a combination of physical method and hardware circuit is generally adopted to reduce the measurement error. Since in actual measuring devices there are a variety of different situations, the general applicability of this method is not strong.
Disclosure of Invention
The invention aims to provide a multi-NTC probe structure based on temperature prediction and a temperature measuring method thereof, which can further reduce errors and have better general applicability.
In order to solve the above technical problem, the present invention provides a multi-NTC probe structure based on temperature prediction, including: a plurality of NTC probes, a copper housing, a metal support structure, wires, and a thermal conductor; a plurality of NTC probes are installed in the copper shell through the metal supporting structure, a heat conductor is connected between the heat transfer surface of each NTC probe and the copper shell, the metal supporting structure and the heat conductor are all grounded, the heat transfer surfaces of the NTC probes are uniformly distributed on the copper shell, and wires of the NTC probes are connected in parallel.
Preferably, the main bodies of the plurality of NTC probes are made of heat insulation foam.
A temperature measurement method of a multi-NTC probe based on temperature prediction comprises the following steps:
step 1, in m NTC probes, obtaining the temperature T measured by each NTC probe at equal time intervals 0 、T 1 、……、T n N represents the serial number of the collection temperature;
Step 4, calculating the predicted temperature T of the single probe p ＝T n-1+ v n /(1-α)；
Preferably, in step 1, the NTC probes are in sufficient contact with the heat-conducting metal, and adjacent NTC probes are sufficiently insulated from each other.
Preferably, in step 5, the temperature T is measured b ＝X×(τ-Y)×T p m -T p m-1 -...T p 1 +T c τ = -t/ln (α), where X represents the current measured temperature value, t represents the time difference between two adjacent measured temperatures, v n The method is used for calculating alpha, and when the value of alpha is stable, the predicted temperature at the time is considered to reach a stable value; t is c Is to compensate for temperature, T c The difference of the heat conduction material of the probe is determined; t is p m Represents the predicted temperature of the mth NTC probe.
Preferably, the value of α is stable, which means that the value of α fluctuates <0.02 in 3 seconds.
The invention has the beneficial effects that: the invention has a plurality of probes for combined measurement, performs prediction according to a temperature gradient algorithm, has a plurality of probes for temperature compensation, can improve the measurement precision, can accelerate the temperature measurement, and can perform rapid temperature prediction according to the measured temperature value.
Drawings
FIG. 1 is a schematic view of a temperature measuring device according to the present invention.
FIG. 2 is a schematic diagram of a temperature measuring circuit according to the present invention.
FIG. 3 is a schematic flow chart of the method of the present invention.
Wherein, 1, a first NTC; 2. a second NTC; 3. a copper housing; 4. a metal support structure; 5. a wire; 6. a heat conductor.
Detailed Description
As shown in fig. 1, a temperature prediction based multi-NTC probe structure includes: a plurality of NTC probes, a copper housing 3, a metal support structure 4, a wire 5, and a heat conductor 6; a plurality of NTC probes are installed in the copper shell 3 through the metal supporting structure 4, a heat conductor 6 is connected between the heat transfer surface of each NTC probe and the copper shell 3, the metal supporting structure 4 and the heat conductor 6 are all grounded, the heat transfer surfaces of the NTC probes are uniformly distributed on the copper shell, and wires 5 of the NTC probes are connected in parallel.
The physical connection of the double probes is that the 1 st probe is fully contacted with the heat conducting metal at the front end as much as possible, and the 2 nd probe is connected with the 1 st probe through a metal wire. Meanwhile, in order to ensure that the 2 nd probe does not contact with the heat conducting metal, so that the two probes become the same heat body, the 2 nd probe needs to be wrapped by the heat insulation foam.
Fig. 2 is a schematic diagram of an equivalent circuit structure according to the present invention. The circuit is characterized in that a measured object is equivalent, and all the measured objects can be equivalent to an RC circuit structure of a resistor R and a capacitor C; due to the diversity and complexity of the heat conduction characteristics of the object to be tested, the object to be tested can be equivalent to a cascade structure of a plurality of RC resistance-capacitance networks; the equivalent resistance-capacitance grid structure of the object to be measured can be equivalent through the cascade structure of the RC resistance-capacitance network; networks employing this architecture can be used to construct thermal conductivity parameters in measured object models.
The measurement of the temperature of the object is reflected in the circuit, namely the resistance value of the corresponding NTC is measured. Considering that the measurement peripheral circuit model (including the grounded shell, the supporting structure and the heat conductor) is actually a cascade model of resistance and capacitance, if temperature prediction is needed, the temperature gradient effect can be considered, and the object temperature can be calculated through the change of the temperature gradients of the plurality of probes.
The temperature rise characteristic and the capacitance charging voltage rise characteristic are similar and both accord with the increment ratio characteristic. Therefore, the calculation prediction of the temperature is equivalent to the prediction of the end point voltage.
As shown in fig. 3, a temperature measurement method of a multi-NTC probe based on temperature prediction includes the following steps:
step 1, in m NTC probes, obtaining the temperature T measured by each NTC probe at equal time intervals 0 、T 1 、……、T n N represents the serial number of the collection temperature; the NTC probes are in full contact with the heat conducting metal, and the adjacent NTC probes are in full heat insulation;
Step 4, calculating the predicted temperature T of the single probe p ＝T n-1+ v n /(1-α)；
Claims (6)
1. A multiple NTC probe structure based on temperature prediction, comprising: a plurality of NTC probes, a copper housing, a metal support structure, wires, and a thermal conductor; a plurality of NTC probes are installed in the copper shell through the metal supporting structure, a heat conductor is connected between the heat transfer surface of each NTC probe and the copper shell, the metal supporting structure and the heat conductor are all grounded, the heat transfer surfaces of the NTC probes are uniformly distributed on the copper shell, and wires of the NTC probes are connected in parallel.
2. The temperature prediction-based multi-NTC probe structure of claim 1, wherein the body of the plurality of NTC probes is made of thermal insulation foam.
3. The temperature measuring method of a multi-NTC probe based on temperature prediction of claim 1, comprising the steps of:
step 1, in m NTC probes, obtaining the temperature T measured by each NTC probe at equal time intervals 0 、T 1 、……、T n N represents the serial number of the collection temperature;
step 2, calculating the temperature difference v acquired by adjacent temperature measuring time n ＝T n -T n-1 ；
Step 3, calculating parameter alpha = v n /v n-1 ；
Step 4, calculating the predicted temperature T of the single probe p ＝T n-1+ v n /(1-α)；
Step 5, calculating the measured temperature T b 。
4. The temperature measurement method of multiple NTC probes based on temperature prediction of claim 3, wherein in step 1, the NTC probes are in sufficient contact with the heat conductive metal and the adjacent NTC probes are substantially thermally insulated.
5. The temperature measuring method using multiple NTC probes based on temperature prediction as claimed in claim 3, wherein in step 5, the measured temperature T is measured b ＝X×(τ-Y)×T p m -T p m-1 -...T p 1 +T c τ = -t/ln (α), where X represents a current measured temperature value, t represents a time difference between two adjacent measured temperatures, v n The method is used for calculating alpha, and when the value of alpha is stable, the predicted temperature at the time is considered to reach a stable value; t is c Is to compensate for temperature, T c The difference of the heat conduction material of the probe is determined; t is a unit of p m Represents the predicted temperature of the mth NTC probe.
6. The temperature prediction-based multi-NTC probe temperature measurement method of claim 5, wherein the value of α is stable, which means the value of α when the value of α fluctuates <0.02 in 3 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211376484.0A CN115752791A (en) | 2022-11-04 | 2022-11-04 | Multi-NTC probe structure based on temperature prediction and temperature measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211376484.0A CN115752791A (en) | 2022-11-04 | 2022-11-04 | Multi-NTC probe structure based on temperature prediction and temperature measuring method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115752791A true CN115752791A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211376484.0A Withdrawn CN115752791A (en) | 2022-11-04 | 2022-11-04 | Multi-NTC probe structure based on temperature prediction and temperature measuring method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN115752791A (en) |
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2022
- 2022-11-04 CN CN202211376484.0A patent/CN115752791A/en not_active Withdrawn
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Application publication date: 20230307 |
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