CN211085270U - Temperature self-compensating device of resistance type displacement sensor - Google Patents
Temperature self-compensating device of resistance type displacement sensor Download PDFInfo
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- CN211085270U CN211085270U CN201921048582.5U CN201921048582U CN211085270U CN 211085270 U CN211085270 U CN 211085270U CN 201921048582 U CN201921048582 U CN 201921048582U CN 211085270 U CN211085270 U CN 211085270U
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- displacement sensor
- resistance
- type displacement
- amplifier
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Abstract
A temperature self-compensating device of a resistance type displacement sensor relates to the field of signal processing of the resistance type displacement sensor. The problem that the resistance type displacement sensor is affected by temperature to generate errors is solved. The utility model discloses a: the device comprises a constant current source, a resistance type displacement sensor, a pre-filter, an amplifier, an anti-aliasing filter, an A/D converter and an MCU. The constant current source provides stable current; the resistance type displacement sensor generates an output measuring signal; the pre-filter filters interference signals introduced from the outside of the system; the amplifier is used for amplifying the signal; the anti-aliasing filter filters interference signals generated by the amplifier; the A/D converter is used for converting analog signals and digital signals; the MCU selects channels of the multi-channel analog switch, processes output voltage signals and converts the voltage into displacement through internal linear processing. The utility model discloses resistance-type displacement sensor temperature self-compensating device can reduce the error that the sensor resistance that the temperature arouses changes and causes, and the method is accurate high-efficient, the practical application of being convenient for.
Description
Technical Field
The utility model provides a temperature arouses resistance type displacement sensor resistance to change the error problem that causes relates to resistance type displacement sensor signal processing field.
Background
The resistance displacement sensor is influenced by the change of the external temperature, the resistance value of the resistance displacement sensor also changes, and thus errors are caused; in the temperature compensation of the sensor, the hardware compensation and the software compensation are divided; the hardware compensation comprises sensitivity temperature drift compensation and zero temperature drift compensation; the software compensation is to compensate the output signal directly, find the relation between the actual and ideal output signal, and display the result as ideal value directly through the operation of the single chip microcomputer, and the software compensation algorithm includes a line-dividing segment linear interpolation method, a cubic spline curve interpolation algorithm and the like.
The utility model discloses a at the follow-up circuit of this three-point connection of two endpoints of resistance-type displacement sensor and output point, can obtain the voltage of full scale point, zero point and output point department under different temperatures, then convert voltage into the displacement through MCU processing unit, can reduce the error that temperature variation brought through this kind of self-compensating method, improve measurement accuracy.
Disclosure of Invention
The utility model discloses the purpose is in order to solve the error problem that the resistance-type displacement sensor resistance that arouses by the temperature changes and causes to a resistance-type displacement sensor temperature self compensating device is provided.
Resistance-type displacement sensor temperature self compensating device, its component part includes: the device comprises a constant current source, a resistance type displacement sensor, a pre-filter, an amplifier, an anti-aliasing filter, an A/D converter and an MCU; the constant current source provides stable current; the resistance type displacement sensor generates an output measuring signal; the pre-filter is used for filtering interference signals introduced from the outside of the system; the amplifier is used for amplifying the signal; the anti-aliasing filter is used for filtering interference signals generated by the amplifier; the A/D converter is used for converting the analog signal and the digital signal; the MCU selects channels of the multi-channel analog switch, processes output voltage signals and converts the voltage into displacement through internal linear processing.
The utility model discloses a resistance-type displacement sensor temperature self-compensating method, it includes following step:
(1) the constant current source, the resistance displacement sensor and the fixed resistor form a series circuit;
(2) determining two end points and an output point of the resistance-type displacement sensor, sequentially connecting a pre-filter and an amplifier to the three points respectively to form three measuring channels, and then respectively connecting different input ends of a multi-path analog switch, wherein the output end of the multi-path analog switch is connected with an anti-aliasing filter, an A/D converter and an MCU;
(3) the MCU selects the three measuring channels, processes the signals and converts the voltage into displacement through internal linear processing.
Wherein, each part of the device in the step (2) has the following functions: the constant current source provides stable current; the resistance type displacement sensor generates an output measuring signal; the pre-filter is used for filtering interference signals introduced from the outside of the system; the amplifier is used for amplifying the signal; the anti-aliasing filter is used for filtering interference signals generated by the amplifier; the A/D converter is used for converting the analog signal and the digital signal; the MCU has two roles: one is to select channels of the multi-channel analog switch, and the other is to process the output voltage signal and convert the voltage into displacement through internal linear processing.
The linear mathematical relationship conversion process in the step (3) is as follows: firstly, obtaining a difference value between full-scale displacement and initial displacement and a difference value between full-scale voltage and zero voltage; then obtaining the ratio of the two differences; multiplying the ratio by the difference between the output voltage of the resistance displacement sensor and the zero voltage; finally, the displacement corresponding to the output voltage of the resistance type displacement sensor can be obtained by adding the product and the initial displacement.
The utility model discloses a temperature self-compensating device of a resistance type displacement sensor, which relates to the field of signal processing of the resistance type displacement sensor; the following circuit is connected to the two end points and the output point of the resistance type displacement sensor, so that the voltages of the full-scale point, the zero point and the output point can be obtained at different temperatures, and then the voltages are converted into displacement through the MCU processing unit, so that the error caused by temperature change can be reduced through the self-compensating device, and the measurement precision is improved; the measuring circuit has the advantages of simple required external elements and simple, convenient and efficient measuring method.
Drawings
FIG. 1 is a block diagram of the operation of a temperature self-compensation device of a resistive displacement sensor;
FIG. 2 is a block diagram of a resistive displacement sensor processing signal;
fig. 3 is a linear voltage versus displacement graph.
Detailed Description
The following describes the temperature self-compensation device of the resistive displacement sensor in detail with reference to the accompanying drawings.
Combine fig. 1, 2, 3 the utility model discloses resistance-type displacement sensor temperature self-compensating device is:
in a first embodiment, as shown in fig. 1, a temperature self-compensation device for a resistive displacement sensor includes: the device comprises a constant current source (1), a resistance displacement sensor (2), a pre-filter (3), an amplifier (4), an anti-aliasing filter (5), an A/D converter (6) and an MCU (7); the constant current source (1) provides stable current; the resistance type displacement sensor (2) generates an output measuring signal; the amplifier (4) is used for amplifying signals; the anti-aliasing filter (5) is used for filtering interference signals generated by the amplifier; the A/D converter (6) is used for converting the analog signal and the digital signal; the MCU (7) selects channels of the multi-channel analog switch, processes output voltage signals and converts the voltage into displacement through internal linear processing.
In a second embodiment, as shown in fig. 2, the signal processing process of the resistive displacement sensor of the present invention is:
1. the constant current source (1), the resistance displacement sensor (2) and the fixed resistor (3) form a measuring circuit; the constant current source (1) provides stable current, the resistance displacement sensor (2) and the fixed resistor (3) are connected in series in the circuit, the resistance displacement sensor (2) generates an output measuring signal, and the fixed resistor (3) is used for protecting the circuit to prevent the device from being burnt out due to overlarge current.
2. Determining two end points and an output point of the resistance-type displacement sensor (2), and sequentially connecting a pre-filter (4) and an amplifier (5) on the three points respectively to form three measuring channels, and then respectively connecting different input ends of a multi-path analog switch (6), wherein the output end of the multi-path analog switch (6) is connected with an anti-aliasing filter (7), an A/D converter (8) and an MCU (9); the front filter (4) is used for filtering interference signals introduced from the outside of the system, the amplifier (5) is used for amplifying signals, the anti-aliasing filter (7) is used for filtering the interference signals introduced by the amplifier (5), the A/D converter (8) converts analog signals into digital signals and transmits the digital signals to the MCU (9), and the MCU (9) has two functions: one is to perform channel selection on the multi-channel analog switch (6), and the other is to process the output voltage signal and convert the voltage into displacement through internal linear processing.
3. After filtering, amplifying, selecting, filtering and A/D converting are carried out on the signals collected at the three points, the MCU (9) processes the output voltage signals and converts the output voltage into displacement through a linear mathematical relationship.
4. The above linear mathematical relationship comprises the following steps: suppose that the voltages at the zero point, the output point and the full scale point of the resistance type displacement sensor (2) are respectively
、
、
Assuming a displacement range of
To
The voltage value at the output point of the resistance type displacement sensor (2)
Corresponding displacement is
As shown in the following formula：
Wherein the content of the first and second substances,
、
、
、
are all known, so that only the voltage value at the output point of the resistance type displacement sensor (2) is measured
Then the voltage value at this point can be obtained
Corresponding displacement at different temperatures
。
In a third embodiment, as shown in fig. 3, the working principle of the voltage-displacement linear relationship diagram of the present invention is as follows:
assuming that the current of the constant current source is I, the resistance of the resistance type displacement sensor is I
The resistance of the fixed resistor is
The voltage values at the zero point, the output point and the full-scale point of the resistance type displacement sensor are respectively
、
、
Within a displacement range of
To
(ii) a When the constant current source, the resistance displacement sensor and the fixed resistor form a series measurement circuit, the following steps are obtained:
=I
，
=I（
+
）。
it is known that the displacement L is linear with the resistance R, i.e. L =
R, multiplying both ends of the equation by the current I, I L =
RI, i.e. L =
U = KU, wherein K =
I.e., displacement L is linear with voltage U, we can:
=K
，
=K
，
=K
。
the utility model has the advantages of it is following: 1. the utility model respectively obtains full-scale voltage, zero voltage and voltage at the output point at the two end points and the output point of the resistance-type displacement sensor, and converts the voltage into displacement through linear mathematical relation, thereby reducing the error caused by the resistance value change of the resistance-type displacement sensor caused by temperature change; 2. in the utility model, software and hardware are combined, thereby realizing temperature self-compensation; 3. the utility model overcomes the shortcoming of the loaded down with trivial details process of resistance-type displacement sensor thermostated container calibration temperature compensation method, it is more simple and direct high-efficient.
Claims (2)
1. The utility model provides a resistance-type displacement sensor temperature self compensating device which characterized in that: the temperature self-compensation device of the resistance type displacement sensor comprises a constant current source, the resistance type displacement sensor, a pre-filter, an amplifier, an anti-aliasing filter, an A/D converter and an MCU; the constant current source is connected with the resistance type displacement sensor, the constant current source provides stable current, and the resistance type displacement sensor generates an output measuring signal; the pre-filter, the amplifier, the anti-aliasing filter, the A/D converter and the MCU are sequentially connected to form a subsequent circuit; the pre-filter is used for filtering interference signals introduced from the outside of the system; the amplifier is used for amplifying signals; the anti-aliasing filter is used for filtering interference signals generated by the amplifier; the A/D converter is used for converting an analog signal and a digital signal; and the MCU is used for selecting channels of the multi-channel analog switches, processing output voltage signals and converting the voltage into displacement through linear processing in the MCU.
2. The temperature self-compensation device of claim 1, wherein: the temperature self-compensation device of the resistance-type displacement sensor is provided with three measured end points, namely a connecting point x of a constant current source and the resistance-type displacement sensor, an output point y of the resistance-type displacement sensor and a connecting point z of the resistance-type displacement sensor and a fixed resistor; the connection points x and z are respectively connected with a subsequent circuit consisting of a pre-filter, an amplifier, an anti-aliasing filter, an A/D converter and an MCU so as to obtain full-scale voltage and zero voltage; the output point y is connected with a subsequent circuit consisting of a pre-filter, an amplifier, an anti-aliasing filter, an A/D converter and an MCU so as to obtain the output voltage of the resistance-type displacement sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921048582.5U CN211085270U (en) | 2019-07-08 | 2019-07-08 | Temperature self-compensating device of resistance type displacement sensor |
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| CN201921048582.5U CN211085270U (en) | 2019-07-08 | 2019-07-08 | Temperature self-compensating device of resistance type displacement sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207730A (en) * | 2019-07-08 | 2019-09-06 | 哈尔滨理工大学 | A kind of resistor type displacement sensor temperature self-compensation method |
| CN112577405A (en) * | 2020-12-11 | 2021-03-30 | 英之茂科技有限公司 | Water surface solar cell panel displacement detection system |
| CN116124360A (en) * | 2023-04-14 | 2023-05-16 | 新乡北方车辆仪表有限公司 | Method for self-judging out-of-tolerance output of piezoresistive pressure sensor |
-
2019
- 2019-07-08 CN CN201921048582.5U patent/CN211085270U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207730A (en) * | 2019-07-08 | 2019-09-06 | 哈尔滨理工大学 | A kind of resistor type displacement sensor temperature self-compensation method |
| CN110207730B (en) * | 2019-07-08 | 2023-09-22 | 哈尔滨理工大学 | Temperature self-compensation method for resistance type displacement sensor |
| CN112577405A (en) * | 2020-12-11 | 2021-03-30 | 英之茂科技有限公司 | Water surface solar cell panel displacement detection system |
| CN116124360A (en) * | 2023-04-14 | 2023-05-16 | 新乡北方车辆仪表有限公司 | Method for self-judging out-of-tolerance output of piezoresistive pressure sensor |
| CN116124360B (en) * | 2023-04-14 | 2023-07-25 | 新乡北方车辆仪表有限公司 | Method for self-judging out-of-tolerance output of piezoresistive pressure sensor |
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