CN101846572B - Method for decreasing basic error of pressure sensor - Google Patents
Method for decreasing basic error of pressure sensor Download PDFInfo
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- CN101846572B CN101846572B CN2010101714890A CN201010171489A CN101846572B CN 101846572 B CN101846572 B CN 101846572B CN 2010101714890 A CN2010101714890 A CN 2010101714890A CN 201010171489 A CN201010171489 A CN 201010171489A CN 101846572 B CN101846572 B CN 101846572B
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- pressure
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Abstract
The invention discloses a method for decreasing the basic error of a pressure sensor. The measuring range of a pressure calibration instrument is equally divided, the pressure sensor generates M pressure measurement data and the corresponding voltage, the measuring range of the pressure sensor is calibrated one by one to obtain M pressure calibration coefficients, the M pressure calibration coefficients are respectively multiplied by X times to obtain the calibration m of pressure calibration values C, the calibration m of the M pressure calibration values C is multiplied by the measurement m of M voltage measurement values V generated by the pressure sensor at the corresponding pre-calibrated air pressure to obtain M pressure values Pm, and the accuracy grades of a group of pressure values Pm are determined and are compared; and when the detected accuracy grades are not increased any more, the optimal value of the coefficients of the measuring range of the sensor is obtained. The invention can decrease the basic error of the pressure sensor and enhances the basic measurement accuracy of the measurement of the pressure sensor.
Description
Technical field
The present invention relates to pressure transducer calibration and field of measuring technique, especially a kind of method that reduces fundamental error in the pressure sensor systems error.
Background technology
All there is error for various reasons in various sensing systems, and pressure transducer is no exception.In measuring process, pressure transducer exists systematic error, finds out and reduce systematic error to help improving measuring accuracy, therefore studies the systematic error that how to reduce pressure transducer and seems extremely important.Chinese scholars has been done many researchs from different angles to reducing the pressure transducer error for this reason, and applied for a large amount of patents, and as: 1, application number is that the Chinese patent disclosed " error correcting method for pressure sensor " of CN200610088029.5 is revised the imbalance of pressure transducer zero-bit, temperature drift, non-linear three errors; 2, application number is that the difference that the Chinese patent disclosed " system and method that is used for compensating pressure sensor errors " of CN200910004648.5 is used between the force value of calibrating sensors and other pressure transducers compensates; 3, application number is that the Chinese patent disclosed " method of metering sensitivity of electronic pressure detector " of CN200810055512.2 carries out dynamic calibration to the electric voltage detector that is calibrated respectively under normal temperature, high temperature and low temperature environment, is mainly used in the temperature correction.These researchs and patent are applied to the each side error of sensor is revised or compensated mostly, but also have important error, i.e. a fundamental error in the pressure transducer error.The fundamental error of pressure transducer is meant the error when carrying out verification before the pressure transducer manufacturing is dispatched from the factory under rated condition.The fundamental error of pressure transducer is that sensor itself is intrinsic, therefore claim inherent error again, it is relevant with the factors such as structural principle, component quality and assembly technology of pressure transducer, and the accuracy class of the size of fundamental error sensor commonly used represents that it is a definite value.Fundamental error also is the important evidence that surveying instrument is divided accuracy.Prior art does not have directly to improve the sensor measurement precision by the solution that reduces the pressure transducer fundamental error, and is powerless to reducing the pressure transducer fundamental error simultaneously yet.
Summary of the invention
In order to overcome the deficiency that prior art can't reduce the pressure transducer fundamental error, the invention provides a kind of method that reduces the pressure transducer fundamental error, overcome prior art to the helpless shortcoming of fundamental error, reduce the fundamental error of pressure transducer, improve measuring accuracy.
Main thought of the present invention is: regulate M pre-calibration air pressure P of pressure calibration instrument output
Pre-calibration m, m=1,2 ... M is applied on the pressure transducer, pressure transducer is produced obtain M pressure data P
Measure m, use P
Calibration mReplace P
Measure m, and be used for the range of calibrating pressure sensor one by one, with M pressure calibration coefficient C
Calibration factor mMultiply by X separately doubly, obtain M pressure calibration value C
Calibration m, with corresponding M voltage measuring value V
Measure mMultiplying each other obtains one group of force value of M spot pressure, and force value is carried out accuracy class calibrating, finds out the optimum value of transducer range coefficient when satisfying accuracy class maximum by increasing and decreasing the X value repeatedly.Make and be in the highest state of precision when measuring the pressure that varies in size all the time.
The present invention specifically comprises the steps:
Step 1: the range of selection pressure prover, make its range that equals pressure transducer, the range of pressure calibration instrument is divided equally M pre-calibration air pressure P
Pre-calibration m, m=1,2 ... M, and be applied on the pressure transducer, M P of pressure calibration instrument output regulated
Pre-calibration m, make pressure transducer produce M pressure measurement data P
Measure mAnd corresponding voltage measuring value V
Measure m, and respectively with this M pressure data P
Measure mWith voltage measuring value V
Measure mStore successively by the sequencing of measuring.(M gets any natural number greater than 5.)
Step 2: with M P
Measure mAs the data that are used for calibrating, and with P
Measure mBe input to pressure calibration instrument sequentially one by one, the starting pressure prover is applied to pressure transducer once more, with M calibration data P
Measure mThe range of calibrating pressure sensor obtains M pressure calibration coefficient C one by one
Calibration factor m, i.e. C
Calibration factor m=P
Measure m/ V
Calibration m, wherein, V
Calibration mBe M the pairing magnitude of voltage of pressure transducer.
Step 3: find out the optimum value that satisfies the highest grade of relative accuracy transducer range coefficient the time by the value of increase and decrease transducer range coefficient X, get X=1 for the first time, M pressure calibration coefficient be multiply by X times separately, C
Calibration factor m* X=C
Calibration m, obtain pressure calibration value C
Calibration m, and store X span 0.85～1.25 one by one by the sequencing that multiplies each other.
Step 4: the calculating pressure value, with M pressure calibration value C
Calibration mM the voltage measuring value V that pressure transducer produces during with corresponding pre-calibration air pressure
Measure mMultiply each other and obtain M pressure value P
m, i.e. C
Calibration m* V
Measure m=P
m
Step 5: the grade calibrating, the pressure transducer calibration method of pressing national regulation is to M pressure value P
mCarry out the accuracy class calibrating, determine one group of pressure value P
mAccuracy class.
Step 6: to one group of pressure value P
mThe accuracy class verification result compare, improved if accuracy class is compared in this suborder calibrating with last time, then on existing transducer range coefficient X, increase Δ X as new transducer range coefficient X repeating step three to step 6; If accuracy class reduces, then on existing transducer range coefficient X, deduct Δ X as new transducer range coefficient X repeating step three to step 6.The span of Δ X is 0.01～0.011, every increase or reduce the primary transducer coefficient of ranger, and counter N adds 1, and the initial value of N is 1.
Step 7: when the accuracy class of step 6 calibrating no longer increased, the transducer range coefficient X of the N-1 time value multiply by the optimum value that the original sensor range is exactly the transducer range coefficient.
The invention has the beneficial effects as follows: at having the defective that there is fundamental error in pressure transducer now, with M calibration data P
Calibration MThe range of calibrating pressure sensor is one by one found out the optimum value that satisfies the highest grade of relative accuracy transducer range coefficient the time by the value of increase and decrease transducer range coefficient X.Can reduce the pressure transducer fundamental error, improve pressure transducer and measure the fundamental measurement precision.Method is simple, can be widely used in the pressure survey field.
The present invention is further described below in conjunction with drawings and Examples.
Description of drawings
Accompanying drawing 1 is a hardware block schematic diagram of the present invention;
Accompanying drawing 2 is flow chart of steps of the present invention;
Embodiment
Native system hardware comprises pressure transducer, conditioner and AD converter, computing machine, measurement operand store, pressure calibration coefficient memory, pressure calibration instrument and pressure data output as shown in Figure 1.Pressure transducer connects pressure calibration instrument by conditioner and AD converter, measurement operand store, pressure calibration instrument connects pressure transducer by gas circuit, pressure transducer connects the pressure calibration coefficient memory by conditioner and AD converter, computing machine, and computing machine connects measures operand store, pressure data output.
Method embodiment 1:
As shown in Figure 2, the present invention includes following steps:
1, the range=10KPa of the range=pressure transducer of selection pressure prover divides equally 10 { P with the range of pressure calibration instrument
Pre-calibration 1..., P
Pre-calibration 10Pre-calibration pressure is applied on the pressure transducer, regulate pressure calibration instrument output and make pressure transducer produce 10 pressure measurement data { P
Measure 1... P
Measure 10And corresponding voltage measuring value { V
Measure 1... V
Measure 10, and respectively 10 pressure datas and 10 voltage measuring values are stored successively by the sequencing of measuring.
2, with 10 { P
Measure 1... P
Measure 10As the data that are used for calibrating, being input to pressure calibration instrument sequentially one by one, the starting pressure prover is applied to pressure transducer once more, with 10 calibration data { P
Measure 1..., P
Measure 10The range of calibrating pressure sensor one by one, 10 pressure calibration coefficient { C obtained
Calibration factor 1..., C
Calibration system Several 10.
3, X=1 for the first time multiply by 1 times separately with 10 pressure calibration coefficients, { C
Calibration factor 1..., C
Calibration factor 10}={ C
Calibration 1..., C
Calibration 10, obtain 10 pressure calibration value C
Calibration m, and store one by one by the sequencing that multiplies each other.Change the transducer range coefficient, find out the optimum value that satisfies the highest grade of relative accuracy transducer range coefficient the time by the value of increase and decrease transducer range coefficient X, the value that at every turn increases and decreases the transducer range coefficient is 0.01.
4, calculating pressure value is with 10 pressure calibration value { C
Calibration 1..., C
Calibration 10And corresponding 10 voltage measuring value { V
Measure 1..., V
Measure 10Multiplying each other obtains 10 force value { P
1..., P
10.
5, press the pressure transducer calibration method of national regulation to 10 force value { P
1..., P
10Carry out the accuracy class calibrating, determine one group of force value { P
1..., P
10Accuracy class.
6, to first group of force value { P
1..., P
10The accuracy class verification result be 0.03000, X is increased to 1.01 repeating steps 3 to 6, obtaining accuracy class=0.02999 expression precision increases, and gets Δ X=0.01, and the X value is increased to 1.02 repeating steps 3 to 6 again.(explanation; Accuracy class is more little, and precision is high more)
7, accuracy class is 0.02987 when X is increased to 1.2.When X was increased to 1.21, accuracy class still was 0.02987.Illustrate that X=1.2 multiply by the optimum value that former range is exactly the transducer range coefficient, precision is the highest simultaneously.
Method embodiment 2:
As shown in Figure 2, the present invention includes following steps:
1, the range=2MPa of the range=pressure transducer of selection pressure prover divides equally 200 { P with the range of pressure calibration instrument
Pre-calibration 1..., P
Pre-calibration 200Pre-calibration air pressure is applied on the pressure transducer, regulate pressure calibration instrument output and make pressure transducer produce 200 pressure measurement data { P
Measure 1..., P
Measure 200And corresponding voltage measuring value { V
Measure 1..., V
Measure 200, and respectively 200 pressure datas and 200 voltage measuring values are stored successively by the sequencing of measuring.
2, with 200 { P
Measure 1..., P
Measure 200As the data that are used for calibrating, being input to pressure calibration instrument sequentially one by one, the starting pressure prover is applied to pressure transducer once more, with 200 calibration data { P
Measure 1..., P
Measure 200The range of calibrating pressure sensor one by one, 200 pressure calibration coefficient { C obtained
Calibration factor 1..., C
Calibration Coefficient 200.
3, X=1 for the first time multiply by 1 times separately with 200 pressure calibration coefficients, { C
Calibration is 1* 1 ..., C
Calibration factor 200* 1}={C
Calibration 1..., C
Calibration 200, obtain 200 pressure calibration value C
Calibration M, and store one by one by the sequencing that multiplies each other.Find out the optimum value that satisfies the highest grade of relative accuracy transducer range coefficient the time by the value of increase and decrease transducer range coefficient X, the value that at every turn increases and decreases the transducer range coefficient is 0.01.
4, calculating pressure value is with 200 pressure calibration value { C
Calibration 1..., C
Calibration 200And corresponding 200 voltage measuring value { V
Measure 1..., V
Measure 200Multiplying each other obtains 200 force value { P
1..., P
200.
5, press the pressure transducer calibration method of national regulation to 200 force value { P
1..., P
200Carry out the accuracy class calibrating, determine one group of force value { P
1..., P
200Accuracy class.
6, to first group of force value { P
1..., P
200The accuracy class verification result be 0.03000, X is increased to 1.01 repeating steps 3 to 6, obtaining accuracy class=0.03001 expression precision reduces, get Δ X=-0.01, X is reduced to 0.99 repeating step 3 to 6, the grade verification result is 0.02999, illustrates that the accuracy class raising is reduced to 0.98 repeating step 3 to 6 again with the X value.
7, accuracy class is 0.02997 when X is reduced to 0.91.When X was reduced to 0.90, accuracy class still was 0.02997.Illustrate that X=0.91 multiply by the optimum value that former range is exactly the transducer range coefficient, precision is the highest simultaneously.
Claims (1)
1. a method that reduces the pressure transducer fundamental error is characterized in that comprising the steps:
Step 1: the range of selection pressure prover, make its range that equals pressure transducer, the range of pressure calibration instrument is divided equally M pre-calibration air pressure P
Pre-calibration m, m=1,2 ... M, and be applied on the pressure transducer, M P of pressure calibration instrument output regulated
Pre-calibration m, make pressure transducer produce M pressure measurement data P
Measure mAnd corresponding voltage measuring value V
Measure m
Step 2: with M P
Measure mAs the data that are used for calibrating, and with P
Measure mBe input to pressure calibration instrument sequentially one by one, the starting pressure prover is applied to pressure transducer once more, with M calibration data P
Measure mThe range of calibrating pressure sensor obtains M pressure calibration coefficient C one by one
Calibration factor m, i.e. C
Calibration factor m=P
Measure m/ V
Calibration m, wherein, V
Calibration mBe that pressure transducer is corresponding to M calibration data P
Measure mM magnitude of voltage;
Step 3: M pressure calibration coefficient be multiply by X doubly separately, C
Calibration factor m* X=C
Calibration m, obtain pressure calibration value C
Calibration m, and store one by one by the sequencing that multiplies each other, X span 0.85～1.25, the X value is 1 during computing for the first time;
Step 4: the calculating pressure value, with M pressure calibration value C
Calibration mM the voltage measuring value V that pressure transducer produces during with corresponding pre-calibration air pressure
Measure mMultiply each other and obtain M pressure value P
m, i.e. C
Calibration m* V
Measure m=P
m
Step 5: the pressure transducer calibration method of pressing national regulation is to M pressure value P
mCarry out the accuracy class calibrating, determine one group of pressure value P
mAccuracy class;
Step 6: to one group of pressure value P
mThe accuracy class verification result compare, improved if accuracy class is compared in this suborder calibrating with last time, then on existing transducer range coefficient X, increase Δ X as new transducer range coefficient X repeating step three to step 6; If accuracy class reduces, then on existing transducer range coefficient X, deduct Δ X as new transducer range coefficient X repeating step three to step 6; The span of Δ X is 0.01～0.011, every increase or reduce the primary transducer coefficient of ranger, and counter N adds 1, and the initial value of N is 1;
Step 7: when the accuracy class of step 6 calibrating no longer increased, the transducer range coefficient X of the N-1 time value multiply by the optimum value that the original sensor range is exactly a transducer range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101714890A CN101846572B (en) | 2010-05-13 | 2010-05-13 | Method for decreasing basic error of pressure sensor |
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|---|---|---|---|
| CN2010101714890A CN101846572B (en) | 2010-05-13 | 2010-05-13 | Method for decreasing basic error of pressure sensor |
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| CN101846572B true CN101846572B (en) | 2011-11-30 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435391A (en) * | 2011-10-27 | 2012-05-02 | 西北工业大学 | Apparatus for detecting precision of pressure scan system sensor in real time |
| CN102680170B (en) * | 2012-05-29 | 2014-04-16 | 西北工业大学 | System for improving accuracy of pressure measuring equipment |
| CN108287633B (en) * | 2015-10-08 | 2021-06-01 | Oppo广东移动通信有限公司 | Calibration method and device of pressure sensor |
| CN105571777A (en) * | 2015-12-23 | 2016-05-11 | 努比亚技术有限公司 | Sensitivity calibration method and device, and mobile terminal |
| CN106153251B (en) * | 2016-08-31 | 2019-07-23 | 青岛金渊焊割设备有限公司 | A kind of digital pressure gauge calibration verification technical method |
| CN108007639B (en) * | 2016-10-31 | 2020-07-17 | 上海广茂达光艺科技股份有限公司 | Pressure data processing method and system |
| CN110045316B (en) * | 2019-04-10 | 2022-07-01 | 中国电力科学研究院有限公司 | Mutual inductor error calibration method and system for reducing inherent error influence |
| CN113340525B (en) * | 2021-06-07 | 2022-08-23 | 安徽工业大学 | Method for acquiring working characteristic parameters of piezoelectric pressure sensor for implementing quasi-static calibration |
| CN114235275A (en) * | 2021-12-15 | 2022-03-25 | 南京英锐创电子科技有限公司 | Calibration method and device of pressure sensor and electronic equipment |
| CN116164881A (en) * | 2022-12-17 | 2023-05-26 | 廊坊西波尔钻石技术有限公司 | Calibration system and calibration method of barometric instrument |
| CN116059490B (en) * | 2023-03-06 | 2023-08-04 | 苏州鱼跃医疗科技有限公司 | Pressure sensor self-correction method, system, breathing machine, controller and memory |
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| CN1487267A (en) * | 2002-06-13 | 2004-04-07 | 西南研究会 | System and method for calibrating distortion signal with another known calibrated signal |
| CN101089574A (en) * | 2006-06-14 | 2007-12-19 | 昆山双桥传感器测控技术有限公司 | Error correcting method for pressure sensor |
| CN101281074A (en) * | 2007-12-28 | 2008-10-08 | 奇瑞汽车股份有限公司 | Pressure sensor calibrating method for test system with calibration scale |
| CN101545819A (en) * | 2009-05-05 | 2009-09-30 | 西北工业大学 | Method of calibrating PVDF voltage coefficient when measuring gauge pressure of rotary body |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1487267A (en) * | 2002-06-13 | 2004-04-07 | 西南研究会 | System and method for calibrating distortion signal with another known calibrated signal |
| CN101089574A (en) * | 2006-06-14 | 2007-12-19 | 昆山双桥传感器测控技术有限公司 | Error correcting method for pressure sensor |
| CN101281074A (en) * | 2007-12-28 | 2008-10-08 | 奇瑞汽车股份有限公司 | Pressure sensor calibrating method for test system with calibration scale |
| CN101545819A (en) * | 2009-05-05 | 2009-09-30 | 西北工业大学 | Method of calibrating PVDF voltage coefficient when measuring gauge pressure of rotary body |
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