CN105043665B - A kind of pressure detection system and its calibration method with automatic calibration function - Google Patents
A kind of pressure detection system and its calibration method with automatic calibration function Download PDFInfo
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- CN105043665B CN105043665B CN201510532005.3A CN201510532005A CN105043665B CN 105043665 B CN105043665 B CN 105043665B CN 201510532005 A CN201510532005 A CN 201510532005A CN 105043665 B CN105043665 B CN 105043665B
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Abstract
The present invention provides a kind of pressure detection system and its calibration method with automatic calibration function, pressure detection system includes that error writing module, error memory module and error read module, the error information that error writing module obtains periodically is stored to error memory module, error reads module calls error information, the pressure values of actual measurement add the error information, as exact pressure value.Pressure detection system of the invention realizes high-precision pressure measurement function by calibrating automatically under the premise of using inexpensive pressure transducer.
Description
Technical field
The present invention relates to pressure detection techniques, and in particular to a kind of pressure detection system with automatic calibration function and its
Calibration method.
Background technique
The automation field (such as air pressure therapeutic equipment) for accurately detecting atmospheric pressure is needed to need to carry out pressure detection,
Pressure detection at present mainly carries out pressure detection using following two:
One is by pressure transducer circuit plus the method for potentiometer calibrates pressure transducer, but this pressure
The method precision detected by force is poor, and calibration process is excessively complicated, and the time is longer, and human cost is excessively high, in the application error compared with
Greatly；
Another kind is to use directly to complete pressure detection using high-precision pressure transducer, although this method precision
Height, but cost is obviously obvious excessively high.
Summary of the invention
In view of this, the present invention provides a kind of pressure detection system and its calibration method with automatic calibration function, purport
Under the premise of guaranteeing detection accuracy, the cost of detection pressure is farthest reduced.
The technical solution adopted by the present invention specifically:
A kind of pressure detection system with automatic calibration function, including error writing module, error memory module and mistake
Difference reads module, and the error information that error writing module obtains periodically is stored to error memory module, and error reads module
Error information is transferred, the pressure values of actual measurement add the error information, as exact pressure value.
In the above-mentioned pressure detection system with automatic calibration function, the error writing module specifically:
Single-chip microcontroller control standard gas source pressurizes simultaneously to pressure transducer and normal pressure sensor, and the normal pressure passes
Pressure measurement is transmitted to single-chip microcontroller by sensor, and the pressure transducer, will by interface circuit through signal amplifying and conditioning circuit
Pressure measurement is transmitted to single-chip microcontroller, and the single-chip microcontroller is sensed according to the pressure transducer received and the normal pressure
The pressure measurement of device calculates error between the two.
In the above-mentioned pressure detection system with automatic calibration function, the error memory module specifically:
The single-chip microcontroller from which further follows that error information according to error between the two, described in the single-chip microcontroller will obtain
Error is continuously written into storage unit by interface circuit, and with the variation of standard gas source output pressure, the storage unit is deposited
All error informations between the pressure transducer and the normal pressure sensor are stored up.
In the above-mentioned pressure detection system with automatic calibration function, the error reads module specifically:
The error information stored in the pressure measurement reference memory unit of the pressure transducer, can be obtained the pressure
The exact pressure value that strong sensor should be measured.
In the above-mentioned pressure detection system with automatic calibration function, the single-chip microcontroller passes through control gas source control circuit
Change the output pressure of the standard gas source periodically in the measurement range of the pressure transducer.
A kind of automatic calibrating method of pressure detection system, including error write step, error storing step and error are read
Step out, the error information that error write step obtains periodically are stored to error storing step, and error reading step is transferred
The pressure values of error information, actual measurement add the error information, as exact pressure value.
In the automatic calibrating method of above-mentioned pressure detection system, the error write step specifically:
Single-chip microcontroller control standard gas source pressurizes simultaneously to pressure transducer and normal pressure sensor, and the normal pressure passes
Pressure measurement is transmitted to single-chip microcontroller by sensor, and the pressure transducer, will by interface circuit through signal amplifying and conditioning circuit
Pressure measurement is transmitted to single-chip microcontroller, and the single-chip microcontroller is sensed according to the pressure transducer received and the normal pressure
The pressure measurement of device calculates error between the two.
In the automatic calibrating method of above-mentioned pressure detection system, the error storing step specifically:
The single-chip microcontroller from which further follows that error information according to error between the two, described in the single-chip microcontroller will obtain
Error is continuously written into storage unit by interface circuit, and with the variation of standard gas source output pressure, the storage unit is deposited
All error informations between the pressure transducer and the normal pressure sensor are stored up.
In the automatic calibrating method of above-mentioned pressure detection system, the error reading step specifically:
The error information stored in the pressure measurement reference memory unit of the pressure transducer, can be obtained the pressure
The exact pressure value that strong sensor should be measured.
In the automatic calibrating method of above-mentioned pressure detection system, the single-chip microcontroller makes institute by controlling gas source control circuit
The output pressure for stating standard gas source periodically changes in the measurement range of the pressure transducer.
The beneficial effect comprise that:
Pressure detection system of the invention is mainly used for needing accurately detecting the automatic control occasion of atmospheric pressure, such as air
Pressure therapy instrument and the detection of the pressure of similar field, compared with prior art, have easy to operate, automatic calibration accuracy high and
Feature at low cost；Specifically:
Compared with the first scheme in background technique, the prior art using the common pressure transducer in market, with amplification
When device carries out signal condition, in the high-end of measured value, low side or entirety, there are 5~20% mistakes for semiconductor transducer output
Difference, and also not identical with the error of batch products, the linearity, adjust it is time-consuming and laborious, each sensor averagely need 5min with
On adjustment time, and the present invention realize its calibrate automatically function when, regulating time is minimum can be reduced to less than 1min,
And the operation adjusted can carry out in batches；
Compared with the first scheme in background technique, the prior art uses commercially available high-precision sensor, and each is sold
Nearly hundred yuan of valence and the supply of material it is highly unstable, and the present invention realize its calibrate automatically function when, realizing with high-precision pass
Under the premise of sensor same calibration precision, the cost of each pressure module reduces by 70% or more, and cost is substantially reduced.
Detailed description of the invention
When considered in conjunction with the accompanying drawings, the present invention can be more completely and better understood.Attached drawing described herein is used to provide
A further understanding of the present invention, examples and descriptions thereof are used to explain the present invention, does not constitute improper limitations of the present invention.
Fig. 1 is a kind of structural schematic diagram of the pressure detection system with automatic calibration function of the present invention；
Fig. 2 is the calibration flow diagram of pressure detection system of the invention.
Specific embodiment
The technical scheme of the present invention will be explained in further detail with reference to the accompanying drawings and embodiments.
A kind of pressure detection system with automatic calibration function as shown in Figure 1, was manufactured in sensor module
Cheng Zhong is calibrated in the following ways:
Pressure transducer and normal pressure sensor are connected into standard gas source simultaneously, single-chip microcontroller (MCU) controls standard gas source
It pressurizes simultaneously to pressure transducer and normal pressure sensor, MCU obtains pressure transducer and normal pressure sensor to standard
Simultaneously error between the two is calculated in the measurement result of air pressure pressure, in which: normal pressure sensor is by as calibration function
Pressure transducer and signal amplifying and conditioning circuit the integration composition of energy, therefore undesired signal amplifies；But pressure transducer is examined
The signal measured then need signal amplifying and conditioning circuit to amplify after through interface circuit (connecting line either winding displacement and socket contact pin
Combination) it is sent to MCU, in fact, obtained error amount is often multiple groups numerical value since sample magnitude is too many and initial value is indefinite
Perhaps multiple groups numerical value or difference are obtained one group of slope as error information by difference after MCU is calculated, it may be assumed that MCU is sampled simultaneously
After sampling, normal pressure sensor and pressure transducer is calculated in the value of normal pressure sensor and pressure transducer
Error, and convert error to the data being made of zero point value and multiple groups linearity slope, be saved in and deposited by interface circuit
In reservoir, after the output pressure of standard gas source changes a cycle in the measurement range of pressure module, depositing in pressure module
Reservoir is all error informations stored in the period between pressure transducer and normal pressure sensor.
Standard gas source therein is by the solenoid valve block of a pressure pump, pressure vessel and an output pressure at passing through
By the way of electronic signal control (i.e. gas source control circuit in Fig. 2), the pressure values of output are gently adjusted.
As a kind of preferred embodiment, the pressure applied to the standard gas source in pressure detection system of the invention adjusts model
It encloses for 0~100KPa, adjusting step-length is 1KPa, and a cycle of standard gas source refers to that output pressure is gradually increased to maximum by 0
The process of value, maximum value therein are the arbitrary values being set according to actual conditions as less than 100KPa, such as: according to the speed of 1KPa/s
Spend the process that the pressure of pressure transducer and standard brick pressure transducer is incremented to 40KPa by 0.
Calibration circuit mainly includes by MCU, high-precision normal pressure sensor and gas source control circuit and is gas
The accessory power supply (alternating current of 12V DC or 220V, determined by gas source) etc. of source control circuit power supply, working principle is specific
It is as shown in Figure 2:
MCU control gas source control circuit makes standard gas source output pressure (stop or start by the key being set on MCU
Output, the pressure values of output are observed by display screen in real time), pressure transducer to be calibrated (after signal amplifies) and high-precision
Normal pressure sensor measure the pressure respectively and it be transmitted to MCU by interface circuit, MCU calculates pressure transducer
Pressure error between normal pressure sensor is written by interface circuit by the error information that pressure error obtains and is stored
Device.
So, in the application process of sensor module, user only needs to measure the output valve of pressure transducer, then
In conjunction with the error information stored in memory, so that it may the pressure data after obtaining accurate calibration.
As can be seen that the link of manual adjustment amplifier circuit is omitted in calibration method of the invention, without being intended
It is total to calculate to realize calibration, under the premise of greatly improving production efficiency, calibration error is reduced, so that the stabilization of system
Property is improved.
In general, the precision of the normal pressure sensor of calibration module is higher than the pressure transducer of pressure module at least
An order of magnitude；That is: according to the pressure transducer being calibrated can be with the pressure of precise measurement 1KPa, normal pressure passes at this time
Sensor then should can be with the pressure of precise measurement 0.1KPa.
In practical projects, storage unit of the memory as error information can also be replaced using the MCU of low cost, directly
Output digit signals are connect, so, user can further save the cost of A/D conversion when using sensor module, will
The error of A/D conversion reduces.
In conjunction with attached drawing, embodiments of the present invention are described in detail above, and attached drawing herein is for providing to this
Invention is further understood.Obviously, the foregoing is merely the preferable specific embodiment of the present invention, but protection scope of the present invention
Be not limited thereto, it is any be to one skilled in the art can readily occur in, essentially without be detached from it is of the invention
Change or replacement are also all included in the scope of protection of the present invention.
Claims (2)
1. a kind of pressure detection system with automatic calibration function, which is characterized in that stored including error writing module, error
Module and error read module, and the error information that error writing module obtains periodically is stored to error memory module, error
Module calls error information is read, the pressure values of actual measurement add the error information, as exact pressure value；
The error writing module specifically:
Single-chip microcontroller control standard gas source pressurizes simultaneously to pressure transducer and normal pressure sensor, the normal pressure sensor
Pressure measurement is transmitted to single-chip microcontroller, the pressure transducer is through signal amplifying and conditioning circuit, by interface circuit by pressure
Measured value is transmitted to single-chip microcontroller, and the single-chip microcontroller is according to the pressure transducer and the normal pressure sensor received
Pressure measurement calculates error between the two；
The error memory module specifically:
The single-chip microcontroller from which further follows that error information, the error that the single-chip microcontroller will obtain according to error between the two
It is continuously written into storage unit by interface circuit, with the variation of standard gas source output pressure, the storage unit is stored
All error informations between the pressure transducer and the normal pressure sensor；
The error reads module specifically:
The error information stored in the pressure measurement reference memory unit of the pressure transducer can be obtained the pressure and pass
The exact pressure value that sensor should be measured；
The single-chip microcontroller makes the output pressure of the standard gas source in the pressure transducer by controlling gas source control circuit
Measurement range periodically changes；
During sensor module is manufactured, calibrate in the following ways:
Pressure transducer and normal pressure sensor are connected into standard gas source simultaneously, single-chip microcontroller controls standard gas source to pressure sensing
Device and normal pressure sensor pressurize simultaneously, and MCU obtains pressure transducer and normal pressure sensor to standard pressure pressure
Simultaneously error between the two is calculated in measurement result, in which: normal pressure sensor is by the pressure biography as calibration function
Sensor and signal amplifying and conditioning circuit integration composition, therefore undesired signal amplifies；But the signal that pressure transducer detects
MCU is sent to through interface circuit after then needing signal amplifying and conditioning circuit to amplify；The interface circuit is that connecting line is either arranged
The combination of line and socket contact pin；Since sample magnitude is too many and initial value is indefinite, obtained error amount be often multiple groups numerical value or
Multiple groups numerical value or difference are obtained one group of slope as error information, it may be assumed that MCU samples mark simultaneously by person's difference after MCU is calculated
After sampling, normal pressure sensor and pressure transducer is calculated in the value of quasi- pressure transducer and pressure transducer
Error, and convert error to the data being made of zero point value and multiple groups linearity slope, storage is saved in by interface circuit
Storage in device, after the output pressure of standard gas source changes a cycle in the measurement range of pressure module, in pressure module
Device is all error informations stored in the period between pressure transducer and normal pressure sensor；
Standard gas source is by the solenoid valve block of a pressure pump, pressure vessel and an output pressure at by using e-mail
Number control mode, gently adjust the pressure values of output；
The pressure adjustable range of standard gas source in pressure detection system is 0~100KPa, and adjusting step-length is 1KPa, standard gas source
A cycle refer to the process of that output pressure is gradually increased to maximum value by 0, maximum value therein is to set according to the actual situation
It is set to the arbitrary value less than 100KPa；
Calibration circuit mainly includes by MCU, high-precision normal pressure sensor and gas source control circuit and is gas source control
The accessory power supply of circuit power supply processed；The accessory power supply is 12V DC or the alternating current of 220V, is determined by gas source；It is realizing
When its function of calibrating automatically, regulating time is minimum to be reduced to less than 1min, and the operation batch adjusted carries out；
MCU control gas source control circuit makes standard gas source output pressure, stops or starts defeated by the key being set on MCU
Out, the pressure values of output are observed in real time by display screen, pressure transducer to be calibrated is after signal amplifies and high-precision mark
Quasi- pressure transducer measures the pressure respectively and it is transmitted to MCU by interface circuit, and MCU calculates pressure transducer and mark
Memory is written by interface circuit by the error information that pressure error obtains in pressure error between quasi- pressure transducer；
The pressure detection system is mainly used for needing accurately detecting the automatic control occasion of atmospheric pressure；
In practical projects, storage unit of the memory as error information, directly output number are replaced using the MCU of low cost
Signal.
2. a kind of automatic calibrating method of pressure detection system, which is characterized in that including error write step, error storing step
With error reading step, the error information that error write step obtains periodically is stored to error storing step, and error is read
Step transfers error information, and the pressure values of actual measurement add the error information, as exact pressure value；
The error write step specifically:
Single-chip microcontroller control standard gas source pressurizes simultaneously to pressure transducer and normal pressure sensor, the normal pressure sensor
Pressure measurement is transmitted to single-chip microcontroller, the pressure transducer is through signal amplifying and conditioning circuit, by interface circuit by pressure
Measured value is transmitted to single-chip microcontroller, and the single-chip microcontroller is according to the pressure transducer and the normal pressure sensor received
Pressure measurement calculates error between the two；
The error storing step specifically:
The single-chip microcontroller from which further follows that error information, the error that the single-chip microcontroller will obtain according to error between the two
It is continuously written into storage unit by interface circuit, with the variation of standard gas source output pressure, the storage unit is stored
All error informations between the pressure transducer and the normal pressure sensor；
The error reading step specifically:
The error information stored in the pressure measurement reference memory unit of the pressure transducer can be obtained the pressure and pass
The exact pressure value that sensor should be measured；
The single-chip microcontroller makes the output pressure of the standard gas source in the pressure transducer by controlling gas source control circuit
Measurement range periodically changes；
During sensor module is manufactured, calibrate in the following ways:
Pressure transducer and normal pressure sensor are connected into standard gas source simultaneously, single-chip microcontroller controls standard gas source to pressure sensing
Device and normal pressure sensor pressurize simultaneously, and MCU obtains pressure transducer and normal pressure sensor to standard pressure pressure
Simultaneously error between the two is calculated in measurement result, in which: normal pressure sensor is by the pressure biography as calibration function
Sensor and signal amplifying and conditioning circuit integration composition, therefore undesired signal amplifies；But the signal that pressure transducer detects
MCU is sent to through interface circuit after then needing signal amplifying and conditioning circuit to amplify；The interface circuit is that connecting line is either arranged
The combination of line and socket contact pin；Since sample magnitude is too many and initial value is indefinite, obtained error amount be often multiple groups numerical value or
Multiple groups numerical value or difference are obtained one group of slope as error information, it may be assumed that MCU samples mark simultaneously by person's difference after MCU is calculated
After sampling, normal pressure sensor and pressure transducer is calculated in the value of quasi- pressure transducer and pressure transducer
Error, and convert error to the data being made of zero point value and multiple groups linearity slope, storage is saved in by interface circuit
Storage in device, after the output pressure of standard gas source changes a cycle in the measurement range of pressure module, in pressure module
Device is all error informations stored in the period between pressure transducer and normal pressure sensor；
Standard gas source is by the solenoid valve block of a pressure pump, pressure vessel and an output pressure at by using e-mail
Number control mode, gently adjust the pressure values of output；
The pressure adjustable range of standard gas source in pressure detection system is 0~100KPa, and adjusting step-length is 1KPa, standard gas source
A cycle refer to the process of that output pressure is gradually increased to maximum value by 0, maximum value therein is to set according to the actual situation
It is set to the arbitrary value less than 100KPa；
Calibration circuit mainly includes by MCU, high-precision normal pressure sensor and gas source control circuit and is gas source control
The accessory power supply of circuit power supply processed；The accessory power supply is 12V DC or the alternating current of 220V, is determined by gas source；It is realizing
When its function of calibrating automatically, regulating time is minimum to be reduced to less than 1min, and the operation batch adjusted carries out；
MCU control gas source control circuit makes standard gas source output pressure, stops or starts defeated by the key being set on MCU
Out, the pressure values of output are observed in real time by display screen, pressure transducer to be calibrated is after signal amplifies and high-precision mark
Quasi- pressure transducer measures the pressure respectively and it is transmitted to MCU by interface circuit, and MCU calculates pressure transducer and mark
Memory is written by interface circuit by the error information that pressure error obtains in pressure error between quasi- pressure transducer；
The pressure detection system is mainly used for needing accurately detecting the automatic control occasion of atmospheric pressure；
In practical projects, storage unit of the memory as error information, directly output number are replaced using the MCU of low cost
Signal.
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| CN108151932A (en) * | 2017-12-25 | 2018-06-12 | 扬州电力设备修造厂有限公司 | A kind of electric operator tests system temperature drift compensation method |
| CN116007824B (en) * | 2022-12-29 | 2024-03-15 | 北京自动化控制设备研究所 | Error correction method and module of silicon piezoresistance type air pressure sensing module |
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| CN2639869Y (en) * | 2003-06-10 | 2004-09-08 | 北京市海淀区中航机电研究所 | Electric pressure checking table |
| CN101655406A (en) * | 2009-09-11 | 2010-02-24 | 中国铁道科学研究院机车车辆研究所 | Method and device for zero point calibration of gas pressure sensor |
| CN102494841A (en) * | 2011-12-26 | 2012-06-13 | 潍柴动力股份有限公司 | Pressure sensor calibration system |
| CN202614463U (en) * | 2012-05-09 | 2012-12-19 | 齐齐哈尔大学 | A temperature drift calibration device of a piezoresistive pressure sensor |
| CN204439276U (en) * | 2015-02-11 | 2015-07-01 | 中国神华能源股份有限公司 | A kind of pressure sensor calibrating equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130118264A1 (en) * | 2010-08-30 | 2013-05-16 | Ifm Electronic Gmbh | Resistive pressure measuring cell having diagnostic capabilities |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2639869Y (en) * | 2003-06-10 | 2004-09-08 | 北京市海淀区中航机电研究所 | Electric pressure checking table |
| CN101655406A (en) * | 2009-09-11 | 2010-02-24 | 中国铁道科学研究院机车车辆研究所 | Method and device for zero point calibration of gas pressure sensor |
| CN102494841A (en) * | 2011-12-26 | 2012-06-13 | 潍柴动力股份有限公司 | Pressure sensor calibration system |
| CN202614463U (en) * | 2012-05-09 | 2012-12-19 | 齐齐哈尔大学 | A temperature drift calibration device of a piezoresistive pressure sensor |
| CN204439276U (en) * | 2015-02-11 | 2015-07-01 | 中国神华能源股份有限公司 | A kind of pressure sensor calibrating equipment |
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