CN107941417B - Output calibration device and method for pressure sensor - Google Patents
Output calibration device and method for pressure sensor Download PDFInfo
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- CN107941417B CN107941417B CN201711104188.4A CN201711104188A CN107941417B CN 107941417 B CN107941417 B CN 107941417B CN 201711104188 A CN201711104188 A CN 201711104188A CN 107941417 B CN107941417 B CN 107941417B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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Abstract
The invention discloses an output calibration device and method of a pressure sensor, wherein the device comprises the following components: the device comprises an ADC conversion chip, a storage module, a data processing module, a temperature sensor, a DAC conversion chip and an operational amplifier; the ADC conversion chip is used for amplifying and filtering the analog voltage signal output by the pressure sensor and then converting the analog voltage signal into a digital signal; the data stored in the storage module comprises a first relation curve of the pressure value and the voltage value represented by the digital signal, and a second relation curve of the slope, the temperature value and the temperature drift error of each line segment after the first relation curve is divided into a plurality of line segments regarded as straight lines; the data processing module is used for reading the data stored by the storage module and performing linear compensation on the digital signal aiming at nonlinear errors and temperature drift errors based on a piecewise linear interpolation method so as to realize calibration; the DAC conversion chip converts the digital signal after the linear compensation into an analog signal; and the operational amplifier amplifies the analog signal and outputs the amplified analog signal. The invention has high calibration precision and high calibration efficiency.
Description
Technical Field
The present invention relates to the field of electronic devices. And more particularly, to an output calibration apparatus and method for a pressure sensor.
Background
In the existing pressure measurement for a touch screen, a mode of sensing by using a pressure sensor, directly amplifying an output signal of the pressure sensor by using an amplifier, and calibrating an analog voltage signal output by the pressure sensor by using a potentiometer is adopted, wherein the performance of the pressure sensor is completely regarded as pure linear output in an ideal state. But there are many environmental factors that can affect the measurement results during the entire measurement and calibration process. Such as the signal output of the pressure sensor is not truly linear but is a curvilinear output, the gain of the amplifier may be offset over the entire span as the signal varies, etc. Since the potentiometer is used to adjust the output, the operation becomes complicated, the precision is low and the efficiency is low during calibration.
Accordingly, it is desirable to provide an output calibration device and method for a pressure sensor for pressure measurement of a touch screen that is highly accurate and efficient.
Disclosure of Invention
The invention aims to provide an output calibration device and method of a high-precision and high-efficiency pressure sensor.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The invention discloses an output calibration device of a pressure sensor, which comprises: the device comprises an ADC conversion chip, a storage module, a data processing module, a temperature sensor, a DAC conversion chip and an operational amplifier;
the ADC conversion chip amplifies and filters an analog voltage signal output by the pressure sensor and converts the analog voltage signal into a digital signal;
The data stored by the storage module comprises: a first relation curve of the pressure value sensed by the pressure sensor and the voltage value represented by the digital signal obtained by amplifying and filtering the analog voltage signal output by the pressure sensor by utilizing the ADC conversion chip and a second relation curve of the slope and the temperature value of each line segment after dividing the first relation curve into a plurality of line segments regarded as straight lines and the temperature drift errors of the pressure sensor and the ADC conversion chip;
The data processing module reads the data stored by the storage module, and performs linear compensation on the digital signal aiming at nonlinear errors and temperature drift errors based on a piecewise linear interpolation method so as to realize calibration;
the DAC conversion chip converts the digital signal after the linear compensation into an analog signal;
and the operational amplifier amplifies the analog signal and outputs the amplified analog signal.
Preferably, in the apparatus, the formula of the data processing module for performing linear compensation for nonlinear error and temperature drift error on the digital signal based on piecewise linear interpolation is as follows:
VQ＝K×(NS+TS)+A
Wherein, VQ is the voltage value represented by the linear compensated digital signal; NS is the voltage value represented by the digital signal before linear compensation; k is the slope of a corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; a is the initial value of the corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; TS is a temperature compensation value obtained according to a temperature drift error corresponding to a temperature value sensed by the temperature sensor in the second relation curve.
Preferably, in the device, the ADC conversion chip and the pressure sensor are powered by the same power supply.
Preferably, in the device, the storage module, the data processing module and the temperature sensor are integrated in a single chip microcomputer.
The invention also discloses an output calibration method of the pressure sensor, which comprises the following steps:
parameter acquisition: in the process of applying a pressure value from zero to full range to a pressure sensor, converting an analog voltage signal output by the pressure sensor into a digital signal after amplifying and filtering by using an ADC (analog to digital converter) conversion chip, drawing a first relation curve of the pressure value sensed by the pressure sensor and a voltage value represented by the digital signal obtained by converting the analog voltage signal output by the pressure sensor after amplifying and filtering by using the ADC conversion chip, dividing the first relation curve into a plurality of line segments regarded as straight lines, and acquiring the slope of each line segment;
Changing the working temperatures of the pressure sensor and the ADC conversion chip and drawing a second relation curve of temperature values and temperature drift errors of the pressure sensor and the ADC conversion chip;
Actual measurement stage: performing linear compensation aiming at nonlinear errors and temperature drift errors on digital signals obtained by converting analog voltage signals output by the pressure sensor after amplifying and filtering by using the ADC conversion chip based on a piecewise linear interpolation method so as to realize calibration;
and converting the digital signal after linear compensation into an analog signal, amplifying the analog signal and outputting the amplified analog signal.
Preferably, in the method, a formula for performing linear compensation for nonlinear errors and temperature drift errors on a digital signal obtained by amplifying and filtering an analog voltage signal output by a pressure sensor by using the ADC conversion chip based on a piecewise linear interpolation method is as follows:
VQ＝K×(NS+TS)+A
wherein, VQ is the voltage value represented by the linear compensated digital signal; NS is the voltage value represented by the digital signal before linear compensation; k is the slope of a corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; a is the initial value of the corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; TS is a temperature compensation value obtained according to a temperature drift error corresponding to a temperature value sensed by a temperature sensor in the second relation.
Preferably, in the method, the same power supply is used for powering the ADC conversion chip and the pressure sensor in both the parameter acquisition phase and the actual measurement phase.
The beneficial effects of the invention are as follows:
The technical scheme provided by the invention has the advantages of high calibration precision and high calibration efficiency, can realize data acquisition of the pressure sensor with high precision and high anti-interference capability, and has the advantages of high reliability and long service life.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings;
Fig. 1 shows a schematic diagram of the structure of an output calibration device of a pressure sensor.
Fig. 2 shows a schematic circuit diagram of an output calibration device of the pressure sensor.
Fig. 3 shows a schematic diagram of a bridge circuit of a pressure sensor.
Fig. 4 shows a schematic circuit diagram of the pressure sensor.
Fig. 5 shows a circuit schematic of the DAC conversion chip.
Fig. 6 shows a schematic diagram of the sensor output characteristics.
Fig. 7 shows a schematic diagram of a first relationship.
Fig. 8 shows a schematic diagram of a second relationship.
Fig. 9 shows a flow chart of a method of calibrating the output of a pressure sensor.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
As shown in fig. 1 and 2 together, the present embodiment provides an output calibration device of a pressure sensor, including: the device comprises an ADC conversion chip, a storage module, a data processing module, a temperature sensor, a DAC conversion chip and an operational amplifier; the data processing module is respectively and electrically connected with the output end of the ADC conversion chip, the storage module, the output end of the temperature sensor and the input end of the DAC conversion chip, the output end of the DAC conversion chip is electrically connected with the input end of the operational amplifier, and the output end of the operational amplifier is used as the output end of the output calibration device of the whole pressure sensor and is connected with equipment such as an upper computer and the like which need to read the output signal of the pressure sensor;
the ADC conversion chip is used for amplifying and filtering the analog voltage signal output by the pressure sensor and then converting the analog voltage signal into a digital signal;
The data stored by the storage module comprises: a first relation curve of the pressure value sensed by the pressure sensor and the voltage value represented by the digital signal obtained by amplifying and filtering the analog voltage signal output by the pressure sensor by using the ADC conversion chip and a second relation curve of the slope and the temperature value of each line segment after dividing the first relation curve into a plurality of line segments which are regarded as straight lines and the temperature drift errors of the pressure sensor and the ADC conversion chip;
The data processing module reads the data stored in the storage module, and performs linear compensation on the digital signal aiming at nonlinear errors and temperature drift errors based on a piecewise linear interpolation method so as to realize calibration, thereby realizing linear output; the input parameters based on the piecewise linear interpolation method are a voltage value represented by a digital signal and a temperature value sensed by a temperature sensor, wherein the temperature value sensed by the temperature sensor can represent the working temperature values of the pressure sensor and an ADC conversion chip;
the DAC conversion chip converts the digital signal after the linear compensation into an analog signal;
and an operational amplifier for amplifying the analog signal and outputting the amplified analog signal, wherein the output signal of the operational amplifier is used as the output signal of the output calibration device of the pressure sensor, and the operational amplifier is preferably a 2-time operational amplifier.
Wherein,
As shown in fig. 3 and 4 together, the bridge circuit of the pressure sensor generates a voltage change according to the sensed pressure value under the excitation of the standard excitation power source, and outputs an analog voltage signal.
In specific implementation, the ADC conversion chip in the present embodiment is preferably a CS5530 type ADC conversion chip with high accuracy and high performance.
In particular, the DAC conversion chip in the present embodiment is preferably a DAC8311 type DAC conversion chip for converting a digital signal as shown in fig. 5.
Nonlinear errors and temperature drift errors for pressure sensors and output calibration devices of pressure sensors:
The output characteristic of the pressure sensor is shown in fig. 6, in which the left graph shows the nonlinear sensitivity, s= Δu/- Δf; the right graph shows the linear sensitivity, linear sensitivity s= (U-U0)/(F-F0).
In the output calibration device of the pressure sensor and the pressure sensor provided by the embodiment, the pressure sensor and the ADC conversion chip have nonlinear errors and temperature drift errors, which bring about reduction of precision, and in order to ensure that the precision requirement is met in the whole measurement range, the data processing module in the embodiment performs linear compensation on the nonlinear errors and the temperature drift errors on digital signals obtained by converting analog voltage signals output by the pressure sensor after amplifying and filtering the analog voltage signals by the ADC conversion chip, so as to realize calibration.
In specific implementation, the data processing module adopts a piecewise linear interpolation method, and the formula for performing linear compensation on the digital signal aiming at nonlinear errors and temperature drift errors based on the piecewise linear interpolation method is as follows:
VQ＝K×(NS+TS)+A
Wherein, VQ is the voltage value represented by the linear compensated digital signal; NS is the voltage value represented by the digital signal before linear compensation; k is the slope of a corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; a is the initial value of the corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; TS is a temperature compensation value obtained according to a temperature drift error corresponding to a temperature value sensed by the temperature sensor in the second relation curve.
It should be noted that, the first relation curve stored in the storage module and the obtaining manner of obtaining the slope of each line segment after dividing the first relation curve into a plurality of line segments regarded as straight lines are as follows: in the process of applying the pressure value from zero to full range to the pressure sensor, the analog voltage signal output by the pressure sensor is amplified and filtered by the ADC conversion chip and then converted into a digital signal, the pressure value sensed by the pressure sensor is drawn, the analog voltage signal output by the pressure sensor is amplified and filtered by the ADC conversion chip and then converted into a first relation curve of the voltage value represented by the digital signal, as shown in fig. 7, the first relation curve is divided into a plurality of line segments regarded as straight lines, and the slope of each line segment is obtained. The second relation curve stored in the storage module is obtained by the following steps: and changing the working temperatures of the pressure sensor and the ADC conversion chip and drawing a second relation curve of the temperature value and the temperature drift errors of the pressure sensor and the ADC conversion chip, which are common temperature drift errors of the pressure sensor and the ADC conversion chip, as shown in figure 8. The obtained first relation curve and the slope and the second curve of each line segment obtained after the first relation curve is divided into a plurality of line segments which are regarded as straight lines are stored in a storage module, so that the data processing module can read/call the line segments when the pressure sensor is used for actual measurement, the data processing module judges the corresponding line segments of the voltage values represented by the digital signals before linear compensation in the first relation curve, obtains the slope of the line segments, finds the corresponding temperature drift errors in the second relation curve according to the temperature values sensed by the temperature sensor, obtains temperature compensation values according to the temperature drift errors, and finally realizes the linear compensation of the digital signals aiming at the nonlinear errors and the temperature drift errors by utilizing the formula.
In specific implementation, the storage module, the data processing module and the temperature sensor in the embodiment are integrated in a single chip microcomputer, and the single chip microcomputer is preferably a high-performance STM8S103F3P3 type single chip microcomputer. In addition, the singlechip can be further provided with a zero calibration key and a full-scale calibration key, an automatic calibration program for calibrating zero and full-scale output signals of the pressure sensor can be loaded in the singlechip, and the zero and full-scale output signals of the pressure sensor can be calibrated only by respectively pressing the zero calibration key and the full-scale calibration key under the idle and full-scale states after the pressure sensor and the ADC conversion chip are preheated. In addition, the singlechip is also provided with an RS232 communication port, and the operation on the singlechip program and stored data can be realized through the port.
In the specific implementation, the ADC conversion chip and the pressure sensor in this embodiment are powered by the same power supply, so that errors caused by power supply fluctuation can be eliminated, and ratiometric measurement can be further realized.
As shown in fig. 9, the present embodiment further provides an output calibration method of a pressure sensor, including:
Parameter acquisition: in the process of applying a pressure value from zero to full range to a pressure sensor, amplifying and filtering an analog voltage signal output by the pressure sensor by using an ADC conversion chip, converting the analog voltage signal into a digital signal, drawing a first relation curve of the pressure value sensed by the pressure sensor and the voltage value represented by the digital signal obtained by amplifying and filtering the analog voltage signal output by the pressure sensor by using the ADC conversion chip, dividing the first relation curve into a plurality of line segments regarded as straight lines, and acquiring the slope of each line segment;
Changing the working temperatures of the pressure sensor and the ADC conversion chip and drawing a second relation curve of the temperature value and the temperature drift error of the pressure sensor and the ADC conversion chip;
Actual measurement stage: performing linear compensation on a digital signal obtained by amplifying and filtering an analog voltage signal output by a pressure sensor by using an ADC conversion chip based on a piecewise linear interpolation method to realize calibration, wherein input parameters based on the piecewise linear interpolation method are a voltage value represented by the digital signal and a temperature value sensed by using a temperature sensor;
And converting the digital signal after the linear compensation into an analog signal, amplifying the analog signal and outputting the amplified analog signal.
In specific implementation, a formula for performing linear compensation on a digital signal obtained by amplifying and filtering an analog voltage signal output by a pressure sensor by using an ADC conversion chip and then converting the analog voltage signal to a nonlinear error and a temperature drift error based on a piecewise linear interpolation method is as follows:
VQ＝K×(NS+TS)+A
wherein, VQ is the voltage value represented by the linear compensated digital signal; NS is the voltage value represented by the digital signal before linear compensation; k is the slope of a corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; a is the initial value of the corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; TS is a temperature compensation value obtained according to a temperature drift error corresponding to a temperature value sensed by a temperature sensor in the second relation.
In the implementation, the same power supply is used for supplying power to the ADC conversion chip and the pressure sensor in the parameter acquisition stage and the actual measurement stage.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It is further noted that in the description of the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (5)
1. An output calibration device for a pressure sensor, comprising: the device comprises an ADC conversion chip, a storage module, a data processing module, a temperature sensor, a DAC conversion chip and an operational amplifier;
the ADC conversion chip amplifies and filters an analog voltage signal output by the pressure sensor and converts the analog voltage signal into a digital signal;
The data stored by the storage module comprises: a first relation curve of a pressure value sensed by the pressure sensor and a voltage value represented by a digital signal obtained by amplifying and filtering an analog voltage signal output by the pressure sensor by utilizing the ADC conversion chip and then converting the analog voltage signal, and a second relation curve of a slope and a temperature value of each line segment after dividing the first relation curve into a plurality of line segments which are regarded as straight lines and temperature drift errors of the pressure sensor and the ADC conversion chip, wherein the second relation curve is a relation curve for changing working temperatures of the pressure sensor and the ADC conversion chip and drawing the temperature value and the temperature drift errors of the pressure sensor and the ADC conversion chip; the data processing module reads the data stored by the storage module, and performs linear compensation on the digital signal aiming at nonlinear errors and temperature drift errors based on a piecewise linear interpolation method so as to realize calibration;
the DAC conversion chip converts the digital signal after the linear compensation into an analog signal;
the operational amplifier amplifies the analog signal and outputs the amplified analog signal;
The formula of the data processing module for carrying out linear compensation on the digital signal aiming at nonlinear errors and temperature drift errors based on piecewise linear interpolation is as follows:
VQ＝K×(NS+TS)+A
Wherein, VQ is the voltage value represented by the linear compensated digital signal; NS is the voltage value represented by the digital signal before linear compensation; k is the slope of a corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; a is the initial value of the corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; TS is a temperature compensation value obtained according to a temperature drift error corresponding to a temperature value sensed by the temperature sensor in the second relation curve.
2. The output calibration device of claim 1, wherein the ADC conversion chip and the pressure sensor are powered by the same power supply.
3. The output calibration device of claim 1, wherein the memory module, the data processing module, and the temperature sensor are integrated into a single chip microcomputer.
4. A method of calibrating an output of a pressure sensor, comprising:
parameter acquisition: in the process of applying a pressure value from zero to full range to a pressure sensor, converting an analog voltage signal output by the pressure sensor into a digital signal after amplifying and filtering by using an ADC (analog to digital converter) conversion chip, drawing a first relation curve of the pressure value sensed by the pressure sensor and a voltage value represented by the digital signal obtained by converting the analog voltage signal output by the pressure sensor after amplifying and filtering by using the ADC conversion chip, dividing the first relation curve into a plurality of line segments regarded as straight lines, and acquiring the slope of each line segment;
Changing the working temperatures of the pressure sensor and the ADC conversion chip and drawing a second relation curve of temperature values and temperature drift errors of the pressure sensor and the ADC conversion chip;
Actual measurement stage: performing linear compensation aiming at nonlinear errors and temperature drift errors on digital signals obtained by converting analog voltage signals output by the pressure sensor after amplifying and filtering by using the ADC conversion chip based on a piecewise linear interpolation method so as to realize calibration;
Converting the digital signal after linear compensation into an analog signal, amplifying the analog signal and outputting the amplified analog signal;
The formula for performing linear compensation on the digital signal obtained by amplifying and filtering the analog voltage signal output by the pressure sensor by using the ADC conversion chip and then converting the analog voltage signal into the digital signal aiming at nonlinear errors and temperature drift errors based on the piecewise linear interpolation method is as follows:
VQ＝K×(NS+TS)+A
wherein, VQ is the voltage value represented by the linear compensated digital signal; NS is the voltage value represented by the digital signal before linear compensation; k is the slope of a corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; a is the initial value of the corresponding line segment of the voltage value represented by the digital signal before linear compensation in the first relation curve; TS is a temperature compensation value obtained according to a temperature drift error corresponding to a temperature value sensed by a temperature sensor in the second relation.
5. The method of calibrating output of a pressure sensor according to claim 4, wherein the same power source is used for powering the ADC conversion chip and the pressure sensor in both the parameter acquisition phase and the actual measurement phase.
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