CN103162901A - Nonlinear calibrating method for multiple temperature points of pressure sensor - Google Patents

Nonlinear calibrating method for multiple temperature points of pressure sensor Download PDF

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CN103162901A
CN103162901A CN 201310103444 CN201310103444A CN103162901A CN 103162901 A CN103162901 A CN 103162901A CN 201310103444 CN201310103444 CN 201310103444 CN 201310103444 A CN201310103444 A CN 201310103444A CN 103162901 A CN103162901 A CN 103162901A
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pressure
value
adc
temperature
amp
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CN 201310103444
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郭兴玲
王迅生
宁玉笙
高飞
韩跃
余勇
雷卫武
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北京国浩传感器技术研究院(普通合伙)
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Priority to CN 201310103444 priority Critical patent/CN103162901A/en
Publication of CN103162901A publication Critical patent/CN103162901A/en

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Abstract

The invention relates to the relevant technical field of pressure characteristic value acquisition of pressure sensors, in particular to a method and a system for acquiring a pressure characteristic value of a pressure sensor with a nonlinear temperature compensation algorithm. The method includes the steps: sampling the pressure characteristic value of the pressure sensor to obtain a pressure characteristic value D; calculating a temperature drift correction coefficient delta t related with the outside temperature according to the outside temperature; and calculating a corrected value D+delta Dt of the pressure characteristic value. The sensor is calibrated by an upper computer, the upper computer makes a data sheet according to a series of data measured at different temperatures and under different pressures in calibration as the upper computer can execute large-scale computation, a calculating parameter for calculating the pressure value can be rapidly found in an EEProm (electrically erasable programmable read only memory) sheet according to signals measured by a temperature sensor and the pressure sensor when a lower computer is used for measurement, and an accurate pressure value is obtained by calculating. As the temperature drift correction coefficient is added, acquisition accuracy of the pressure characteristic value is remarkably and particularly improved by the aid of a one-step compensation method in a high-temperature area and a low-temperature area.

Description

A kind of many temperature spots gamma correction method of pressure transducer

Technical field

The present invention relates to pressure transducer pressure characteristic value and gather correlative technology field, particularly a kind of pressure transducer pressure characteristic value that contains the non-linear temperature compensation algorithm is converted into the method and system of force value.

Background technology

The manufacturer of pressure transducer provides the pressure transducer of strip resistance network building out mode mostly now, and this sensor has stable performance, circuit design characteristics simple, easy to use.Because the limitation of manufacture craft can't satisfy high precision and high conforming requirement, but precision generally can only satisfy 1% left and right to this sensor due to resistor network.

Although some sensor software compensations, because the imperfection of its computing method, precision can only accomplish 5 ‰, and the described algorithm of patent of the present invention can be accurate to 0.5 ‰ to measuring accuracy, totally can improve an order of magnitude.

In the fields such as early warning of military affairs, aviation, earthquake and disaster, the pressure transducer and the liquid level gauge that need, very strict to the requirement of precision, such as detecting the instrument of aircraft flight height on aircraft; Ensure the Boiler Steam control system that naval vessel energy high-speed smooth is travelled on warship and load water yield control system; System of the pre-police observation WATER LEVEL CHANGES of the disasteies such as reply earthquake etc.Use common pressure transducer in these applications, will because of the low precision of sensor, measure out of true inaccurate with control, the result that finally leads to errors.In the higher field of accuracy requirement, many temperature spots gamma correction method of the present invention is more important.

Summary of the invention

The invention provides a kind of pressure transducer pressure characteristic value acquisition method and system that contains the non-linear temperature compensation algorithm, to solve prior art in the pressure transducer detection system, because the making of algorithm imperfection or compensating circuit is coarse, and the inaccurate technical matters of pressure characteristic value sampling precision that causes.

The technical scheme that adopts is as follows:

Due to the inconsistency of the pressure transducer of actual production, be issued to high-precision pressure at wide temperature range and measure, need to demarcate each pressure transducer.The scaling method that uses is that pressure transducer is placed in temperature control box, and the pressure criteria that use can be traced to the source produces nominal pressure, provides different temperatures by incubator, provides the different pressures value by pressure controller for pressure transducer.Measure the A/D collection value P of the output voltage V p to obtain reflecting actual reception pressure by the A/D converter adcObtain simultaneously reflecting the A/D collection value T of the output voltage V t of environment temperature adc, in conjunction with the standard setting pressure P of pressure source setJust can reflect the non-linear and temperature characterisitic of pressure transducer comprehensively.In order to illustrate the process of demarcation, with 5 Temperature Settings, 5 pressure settings are example.

First pressure sensor temperature is set as minimum temperature spot T1, to the pressure transducer pressurization, from the pressure P of minimum Set (1)Be added to successively maximum pressure P Set (5), record simultaneously the A/D collection value P of the Vp of each spot pressure adc(1,1), P adc(2,1) ..., P adc(5,1); Also to record T corresponding to this temperature adc(1).

Again the pressure transducer environment temperature is set as time low temperature spot T2, to the pressure transducer pressurization, from the pressure P of minimum Set (1)Be added to successively maximum pressure P Set (5), record simultaneously the A/D collection value P of the Vp of each spot pressure adc(1,2), P adc(2,2) ..., P adc(5,2); Record equally T corresponding to this temperature adc(2).

Adjust successively temperature from T1 until T5 repeats to demarcate and records P adc(m, n) and T adc(n), wherein m represent pressure from low to high the order of order (m=1,2 ..., 5).N represent temperature from low to high the order of order (n=1,2 ..., 5).

Just obtained like this three arrays in our hand:

1 " 5 of pressure source standard setting pressure: Pset (m).

2 " 5 of different temperatures collection values: (n).

3 " under different temperatures, the collection value of different pressures is 5*5=25 altogether: (m, n).

These nominal datas are kept to prepare against in the host computer hard disk when being used for making the form of downloading to slave computer EEProm when host computer is demarcated slave computer use.

[005] the present invention due in pressure transducer management system, has adopted the correction of temperature drift algorithm, makes pressure characteristic value acquisition precision higher.Owing to having added the correction of temperature drift coefficient, take especially the method for single compensation at high and low warm area, significantly improved the precision that gathers the pressure characteristic value.Simultaneously, due to gaging pressure cell pressure eigenwert more accurately, therefore can better the detected pressures sensor.

Description of drawings

[006] Fig. 1 is the pressure transducer schematic diagram

Fig. 2 is the modular structure figure of the embodiment of the present invention;

Fig. 3 is that host computer of the present invention asks EEProm tables of data and slave computer usage data table to carry out the process flow diagram of calculation of pressure by interpolation;

Fig. 4 is that interpolation of the present invention obtains revised tonogram;

Embodiment

[007] below in conjunction with the drawings and specific embodiments, the present invention is described in further details, as shown in Figure 2.

[008] the computer control pressure controller is delivered to gas on solenoid valve with certain pressure, controlled by solenoid valve controller again and open that way solenoid valve, gas arrives on normal pressure meter and tested pressure transducer, then controls temperature by incubator by solenoid valve, orifice valve.

[009] at certain temperature, add testing pressure to pressure transducer, measure the A/D collection value P of current sensor output voltage Vp by the A/D converter adAnd the A/D collection value T of output voltage V t ad, the nominal data that the combined standard pressure gauge obtains just can obtain pressure measuring value P by correction, and the computation process of correction was divided into for two steps.

The first step is calculated, and is to the method for nominal data by cubic spline interpolation, from the A/D collection value T of current output voltage Vt adInterpolation obtains the A/D collection value P ' of the output voltage V p under all pressure calibration points adProcess successively the data under the different pressures set point, the explanation as an example of certain spot pressure order force order m' example, m'=1 here, 2,3,4,5.As shown in Figure 3, transverse axis is Tadc (m', the n) data under current pressure point order force order m', and one has 5 temperature spot data, and the longitudinal axis is Padc (m', n) data corresponding to each temperature spot.Obtain P ' (m ') data under current pressure point order m ' according to the Tad numerical interpolation of current measurement.Need to calculate successively corresponding P ' (m ') interpolated data to all 5 pressure set-point.

Because the variation of the A/D image data of uniform pressure, different temperatures is little, but larger on the correction impact, therefore adopt cubic spline functions method interpolation in the sampling point interval, so both can avoid the unsettled shortcoming of high order interpolation precision, and can guarantee again the slickness of interpolating function curve integral body.Cubic spline functions S (Tadc (m')) the expression formula in [Tadc (m', k), Tadc (m', k+1)] (k=0,1,2,3,4) here is:

S k ( T adc ( m ′ ) ) = P adc ( m ′ , k ) + [ P adc ( m ′ , k + 1 ) - P adc ( m ′ , k ) h k - h k 6 ( 2 a k + a k + 1 ) ] ( T abc ( m ′ ) - T abc ( m ′ , k ) ) + a k 2 ( T adc ( m ′ ) - T adc ( m ′ , k ) ) 2 + a k + 1 - a k 6 h k ( T adc ( m ′ ) - T adc ( m ′ , k ) ) 3 - - - ( 1 )

Use three-moment method can simplify the calculated amount of cubic spline functions, under natural boundary conditions, a0=a4=0 is arranged, other unknown quantity a1, a2, a3 satisfy following Diagonal Equation group:

2 μ 1 0 1 - μ 2 2 μ 2 0 1 - μ 3 2 a 1 a 2 a 3 = γ 1 γ 2 γ 3 - - - ( 2 )

Wherein: μ k = h k h k - 1 + h k

γ k = s h k - 1 + h k [ P adc ( mk + 1 ) h k - P adc ( m , k ) h k - P adc ( m , k ) h k - 1 + P adc ( m , k - 1 ) h k - 1 ] ;

h k = T adc ( m ′ , k + 1 ) - T adc ( m ′ , k ) K=0 wherein, 1,2,3.

This system of equations matrix of coefficients diagonal dominance is considered the ubiquity of algorithm, can use chasing method to find the solution.Determine between the location of interpolation T ad, with interpolation T ad substitution (1) formula, just can be in the hope of interpolation result P'(m').Interpolation outside sampling point is used linear interpolation.Cubic spline interpolation can obtain higher interpolation precision, but also brings more calculated amount simultaneously.Because calculated amount is very large, the single-chip microcomputer that sensor is used is difficult to realization, and these calculate all and must complete by host computer when sensor being carried out the linearization demarcation.

Second step calculates, and is that the A/D collection value P' to the output voltage V p under all pressure calibration points obtained in the previous step carries out interpolation, obtains revised pressure measuring value P from the A/D collection value Pad interpolation of current output voltage Vp.As shown in Fig. 4, transverse axis is the P'(m' under all spot pressure order m') data, one has 5 groups of data, and the longitudinal axis is each self-corresponding Pset (m') data of all spot pressure order m'.Carry out linear interpolation according to the Pad numerical value of current measurement and just can obtain the revised pressure P of current measurement data.This step calculates only needs to use linear interpolation can guarantee measuring accuracy.

After we obtain the AD of current temperature value and pressure transducer, by [010], [011], [012], [013] described algorithm, can obtain accurate force value.But the calculating that this process need is a large amount of due to the speed of single-chip microcomputer and the limitation of hardware resource, is completed this calculated amount very difficult.So also need this algorithm is done further processing.

When sensor being carried out linearization calibration, we are by test, the AD collection value when obtaining five temperature that under five spot pressures, each pressure is corresponding: P adc(m, n)., take first force value as example, from the minimum temperature value, how many AD collection values that computer software utilizes this algorithm can calculate 1 ℃ of correspondence of every rising should be.Calculate maximum temperature always.So we just obtain one when actual pressure is constant, the array of the pressure AD value that every degree temperature is corresponding: P adc(1, n ').Do same processing to remaining four force value, just obtain one to the new two-dimensional array after the amplification of test gained two-dimensional array: P adc(m, n '), n ' is that the value of going forward one by one is 1 ℃ from low temperature being begun the order to maximum temperature here.

Open up 5 data blocks in slave computer EEprom storage space, DD value corresponding to different temperatures when depositing respectively five spot pressures used during for measurement.

Computing machine is passed to sensor to the array that [015] is made by serial ports, and sensor stores these data into EEProm corresponding position.

Slave computer is as follows to the use step of temperature compensation algorithm:

The first step, when beginning to measure, first use the temperature sensor measurement temperature, obtain trying to achieve by tabling look-up after temperature this temperature value be maximum pressure value, minimum pressure values with maximum pressure value and downforce value between after the quartern value: the corresponding P0 of DD_Min(), the corresponding P1 of DD_M1(), the corresponding P2 of DD_M2(), the corresponding P3 of DD_M3(), the corresponding P4 of DD_Max().

Second step, measure DD value current and pressure core body force value, by seeing relatively the DD value is at which section of four sections pressure stages.

The 3rd step, to illustrate for example at minimum one section: i.e. DD_Min<DD<DD_M1, curve a: P=a*DD+b who asks at this section.

Asking equational a, b value: P0 and DD_Min, P1 and DD_M1 to bring formula into, to obtain the linear equation in two unknowns formula as follows:

P0=a*DD_Min+b

P1=a*DD_M1+b

P0, P1 are by artificial fixed in temperature compensation, and DD_Min, DD_M1 table look-up and obtain, and solving equations obtains a, b value.

The 4th step, this time, a and b became numerical value known, that the DD value gathers for AD.At this time just can calculate force value according to P=a*DD+b.

The 5th step, because P=ρ h, (ρ is the density of liquid) after obtaining pressure value P, just can go out liquid level according to this derivation of equation: h=P/ ρ.

If measure the DD value lower than DD_Min or higher than DD_Max, test specification has surpassed range, and software can carry out outrange and report to the police.If the DD value can be according to above-mentioned computing method within other scope, corresponding force value and the level value asked.

Above said method is just to have gathered AD value corresponding to five temperature spots under five spot pressures, explain orally host computer and make calibration with the algorithm of two-dimensional array, in the use of the array of slave computer with used a curve to explain orally to the computing method of force value.Do like this product of producing and accomplished 5/10000ths precision, reach domestic and international advanced level.If increase host computer needed number pressure and temperature number when making the calibration array, adopt quafric curve or cubic curve during slave computer calculating pressure value, just can obtain higher precision.

Claims (7)

1. many temperature spots of pressure transducer of the present invention gamma correction method is characterized in that: the pressure criteria that use can be traced to the source produces nominal pressure, provides different temperatures by incubator, provides the different pressures value by pressure controller for pressure transducer.
2. many temperature spots of pressure transducer of the present invention gamma correction method is characterized in that: measure by the A/D converter and can obtain reflecting that sensor probe bears the A/D collection value P of the output voltage V p of pressure adcObtain simultaneously reflecting the A/D collection value T of the output voltage V t of environment temperature adc, in conjunction with the standard setting pressure P of pressure source setJust can reflect the non-linear and temperature characterisitic of pressure transducer, in order to illustrate the process of demarcation, with 5 Temperature Settings, 5 pressure settings are example comprehensively;
First pressure sensor temperature is set as minimum temperature spot T1, to the pressure transducer pressurization, from the pressure P of minimum Set (1)Be added to successively maximum pressure P Set (5), record simultaneously the A/D collection value P of the Vp of each spot pressure adc(1,1), P adc(2,1) ..., P adc(5,1); Also to record T corresponding to this temperature adc(1);
Again the pressure transducer environment temperature is set as time low temperature spot T2, to the pressure transducer pressurization, from the pressure P of minimum Set (1)Be added to successively maximum pressure P Set (5), record simultaneously the A/D collection value P of the Vp of each spot pressure adc(1,2), P adc(2,2) ..., P adc(5,2); Record equally T corresponding to this temperature adc(2);
Adjust successively temperature from T1 until T5 repeats to demarcate and records P adc(m, n) and T adc(n), wherein m represent pressure from low to high the order of order (m=1,2 ..., 5); N represent temperature from low to high the order of order (n=1,2 ..., 5);
Just obtained like this three arrays in our hand:
1 " 5 of pressure source standard setting pressure: Pset (m);
2 " 5 of different temperatures collection values: (n);
3 " under different temperatures, the collection value of different pressures is 5*5=25 altogether: (m, n);
These nominal datas are kept to prepare against in the host computer hard disk when being used for making the form of downloading to slave computer EEProm when host computer is demarcated slave computer use.
3. based on the described algorithm of feature 2, from the A/D collection value T of current output voltage Vt adThe A/D collection value P ' that interpolation obtains the output voltage V p under all pressure calibration points processes the data under the different pressures set point successively, the explanation as an example of certain spot pressure order force order m' example, m'=1 here, 2,3,4,5; As shown in Figure 4, transverse axis is Tadc (m', the n) data under current pressure point order force order m', and one has 5 temperature spot data, and the longitudinal axis is Padc (m', n) data corresponding to each temperature spot; Obtain P ' (m ') data under current pressure point order m ' according to the Tad numerical interpolation of current measurement; Need to calculate successively corresponding P ' (m ') interpolated data to all 5 pressure set-point;
Because the variation of the A/D image data of uniform pressure, different temperatures is little, but larger on the correction impact, therefore adopt cubic spline functions method interpolation in the sampling point interval, so both can avoid the unsettled shortcoming of high order interpolation precision, and can guarantee again the slickness of interpolating function curve integral body; Cubic spline functions S (Tadc (m')) the expression formula in [Tadc (m', k), Tadc (m', k+1)] (k=0,1,2,3,4) here is:
S k ( T adc ( m ′ ) ) = P adc ( m ′ , k ) + [ P adc ( m ′ , k + 1 ) - P adc ( m ′ , k ) h k - h k 6 ( 2 a k + a k + 1 ) ] ( T abc ( m ′ ) - T abc ( m ′ , k ) ) + a k 2 ( T adc ( m ′ ) - T adc ( m ′ , k ) ) 2 + a k + 1 - a k 6 h k ( T adc ( m ′ ) - T adc ( m ′ , k ) ) 3 - - - ( 1 )
Use three-moment method can simplify the calculated amount of cubic spline functions, under natural boundary conditions, a0=a4=0 is arranged, other unknown quantity a1, a2, a3 satisfy following Diagonal Equation group:
2 μ 1 0 1 - μ 2 2 μ 2 0 1 - μ 3 2 a 1 a 2 a 3 = γ 1 γ 2 γ 3 - - - ( 2 )
Wherein: μ k = h k h k - 1 + h k
γ k = s h k - 1 + h k [ P adc ( mk + 1 ) h k - P adc ( m , k ) h k - P adc ( m , k ) h k - 1 + P adc ( m , k - 1 ) h k - 1 ] ;
h k = T adc ( m ′ , k + 1 ) - T adc ( m ′ , k ) K=0 wherein, 1,2,3;
This system of equations matrix of coefficients diagonal dominance, consider the ubiquity of algorithm, can use chasing method to find the solution, determine between the location of interpolation T ad, with interpolation T ad substitution (1) formula, just can be in the hope of interpolation result P'(m'), interpolation outside sampling point is used linear interpolation, cubic spline interpolation can obtain higher interpolation precision, but also brings more calculated amount simultaneously, can use optimized algorithm or operating speed single-chip microcomputer faster.
4. described based on feature 2, the A/D collection value P' of the output voltage V p under all pressure calibration points obtained in the previous step is carried out interpolation, obtain revised pressure measuring value P from the A/D collection value Pad interpolation of current output voltage Vp; As shown in Fig. 4, transverse axis is the P'(m' under all spot pressure order m') data, one has 5 groups of data, the longitudinal axis is each self-corresponding Pset (m') data of all spot pressure order m', carries out linear interpolation according to the Pad numerical value of current measurement and just can obtain the revised pressure P of current measurement data; This step calculates only needs to use linear interpolation can guarantee measuring accuracy; Open up 5 data blocks in slave computer EEprom storage space, DD value corresponding to different temperatures when depositing respectively five spot pressures used during for measurement.
5. described based on feature 2, feature 3 and feature 4, we are by test, the AD collection value when obtaining five temperature that under five spot pressures, each pressure is corresponding: P adc(m, n); , take first force value as example, from the minimum temperature value, how many AD collection values that computer software utilizes this algorithm can calculate 1 ℃ of correspondence of every rising should be; Calculate maximum temperature always, so we just obtain one when actual pressure is constant, the array of the pressure AD value that every degree temperature is corresponding: P adc(1, n '), do same processing to remaining four force value, just obtain one to the new two-dimensional array after the amplification of test gained two-dimensional array: P adc(m, n '), n ' is that the value of going forward one by one is 1 ℃ from low temperature being begun the order to maximum temperature here; Computing machine is by serial ports, array P adc(m, n ') passes to sensor, and sensor stores these data into EEProm corresponding position.
6. many temperature spots of pressure transducer of the present invention gamma correction method is characterized in that:
Slave computer is as follows to the use step of temperature compensation algorithm:
The first step, when beginning to measure, first use the temperature sensor measurement temperature, obtain asking by tabling look-up after temperature this temperature value be maximum pressure value, minimum pressure values with maximum pressure value and downforce value between value after the quartern: the corresponding P0 of DD_Min(), the corresponding P1 of DD_M1(), the corresponding P2 of DD_M2(), the corresponding P3 of DD_M3(), the corresponding P4 of DD_Max();
Second step, measure DD value current and pressure core body force value, by seeing relatively the DD value is at which section of four sections pressure stages;
The 3rd step, to illustrate for example at minimum one section: i.e. DD_Min<DD<DD_M1, curve a: P=a*DD+b who asks at this section;
Asking equational a, b value: P0 and DD_Min, P1 and DD_M1 to bring formula into, to obtain the linear equation in two unknowns formula as follows:
P0=a*DD_Min+b
P1=a*DD_M1+b
P0, P1 are by artificial fixed in temperature compensation, and DD_Min, DD_M1 table look-up and obtain, and solving equations obtains a, b value;
The 4th step, this time, a and b became numerical value known, that the DD value gathers for AD; At this time just can calculate force value according to P=a*DD+b;
The 5th step, because P=ρ h, (ρ is the density of liquid) after obtaining pressure value P, just can go out liquid level according to this derivation of equation: h=P/ ρ.
7. described based on feature 6, slave computer uses once curve to come the pressure of calculation pressure sensor, is going out liquid depth with calculation of pressure, if require more high-precision product, can calculate with quafric curve or cubic curve.
CN 201310103444 2013-03-28 2013-03-28 Nonlinear calibrating method for multiple temperature points of pressure sensor CN103162901A (en)

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CN105092145B (en) * 2015-05-27 2017-12-26 重庆川仪自动化股份有限公司 Applied to the temperature and pressure compensation linear correction method on intelligent transducer
CN104964790A (en) * 2015-06-12 2015-10-07 广东电网有限责任公司电力科学研究院 Method for correcting dynamic pressure in combustion chamber measured by pressure guiding tube
CN104964790B (en) * 2015-06-12 2017-12-12 广东电网有限责任公司电力科学研究院 The modification method of dynamic pressure in combustion chamber is measured using pressure guiding pipe
CN105258846A (en) * 2015-10-08 2016-01-20 歌尔声学股份有限公司 Method and device for calibrating pressure sensor
CN106610331A (en) * 2015-10-27 2017-05-03 沈阳中科奥维科技股份有限公司 Control method for pressure meter calibration for petroleum transmission pipelines in petroleum industry
CN106644193A (en) * 2017-01-27 2017-05-10 武汉立易方科技有限公司 Pressure intensity value determination method and system
CN106840516A (en) * 2017-03-02 2017-06-13 成都信息工程大学 A kind of pressure gauge temperature drift scaling method based on fitting of a polynomial
CN108362311A (en) * 2018-01-18 2018-08-03 上海兰宝传感科技股份有限公司 A kind of distance measuring sensor segmented compensated distance method
CN109323796A (en) * 2018-10-27 2019-02-12 哈尔滨工业大学 A kind of full warm area range pressure sensor scaling method

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