CN107144400A - Differential pressure pickup and its calibration method, calibration check method - Google Patents
Differential pressure pickup and its calibration method, calibration check method Download PDFInfo
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- CN107144400A CN107144400A CN201710312688.0A CN201710312688A CN107144400A CN 107144400 A CN107144400 A CN 107144400A CN 201710312688 A CN201710312688 A CN 201710312688A CN 107144400 A CN107144400 A CN 107144400A
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- pressure difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
Abstract
The invention provides a kind of calibration method of differential pressure pickup, calibrated for the pressure difference that the pressure differential detection unit to the differential pressure pickup is detected, including：S11, continuous n times collection first zero measurement pressure difference；The first zero measurement pressure difference is the pressure difference detected under the conditions of zero point by the pressure differential detection unit, and the N is 5 to 20；S12, to N number of first zero measurement pressure difference carry out denoising, obtain N number of zero point denoising pressure difference；S13, the amount of bias according to N number of zero point denoising pressure difference calculating differential pressure pickup；S14, using the amount of bias measurement pressure difference of the pressure differential detection unit is calibrated, obtain calibrating value；The calibrating value=measurement pressure difference-amount of bias.Present invention also offers the calibration check method and differential pressure pickup of a kind of differential pressure pickup.The present invention realizes the real time calibration for measuring differential pressure pickup pressure difference；By being tested to calibration result, it is possible to increase the accuracy of calibration.
Description
Technical field
The present invention relates to metrological testing technology field, and in particular to a kind of differential pressure pickup and its calibration method, calibration inspection
Proved recipe method.
Background technology
Differential pressure pickup is to refer to the sensor for measuring the difference between two pressure, including but not limited to monofilm
The differential pressure pickup of the technical principles such as piece, double diaphragms, hot type.Differential pressure pickup is widely used in medical detection, industrial automatic control, iron
The various fields such as road traffic, Aero-Space, military project, petrochemical industry, oil well, electric power, the design principle based on differential pressure pickup, it is in inspection
The benchmark zero point of survey is by environmental factor（Such as humiture, atmospheric pressure, electromagnetic interference）Influence, can cause to measure obtained pressure difference
There is the situation for deviateing dead-center position, that is, zero drift error occur, so as to cause the equipment using this sensor, system to occur
Uncertain mistake.
The present invention easily produces the technological deficiency of zero drift error for existing differential pressure pickup in dead-center position, carries
A kind of differential pressure pickup is gone out, dynamic corrections is carried out to measurement pressure difference by software, without artificial input calibration parameter
The real time calibration to measuring pressure difference can be achieved；In addition, by being tested to calibration result, it is possible to increase calibration it is accurate
Property.
The content of the invention
It is existing to solve it is an object of the invention to provide a kind of differential pressure pickup and its calibration method, calibration check method
There is the problem of differential pressure pickup easily produces zero drift error.
It is an object of the present invention to provide a kind of calibration method of differential pressure pickup, for the differential pressure pickup
The pressure difference that detects of pressure differential detection unit calibrated, comprise the following steps：
S11, continuous n times collection first zero measurement pressure difference；First zero measurement pressure difference under the conditions of zero point by institute
The pressure difference that pressure differential detection unit is detected is stated, the N is 5 to 20；
S12, to N number of first zero measurement pressure difference carry out denoising, obtain N number of zero point denoising pressure difference；
S13, the amount of bias according to N number of zero point denoising pressure difference calculating differential pressure pickup；
S14, using the amount of bias measurement pressure difference of the pressure differential detection unit is calibrated, obtain calibrating value；Institute
State calibrating value=measurement pressure difference-amount of bias.
Wherein, the amount of bias is removed after a maximum and a minimum value for N number of zero point denoising pressure difference
Average value.
Further, the time interval of the double collection first zero measurement pressure difference is 250 milliseconds to 2 seconds.
Further, the step S13 comprises the following steps：
S131, calculated by the N number of zero point denoising pressure difference and obtain an effective pressure difference；Effective pressure difference is the N
Individual zero point denoising pressure difference removes the average value after a maximum and a minimum value；
S132, repeat step S11, S12, S131, calculating obtain M effectively pressure differences；The M is 10 to 100；
S133, the amount of bias according to the M effective pressure differences calculating differential pressure pickups；The amount of bias is the M
Effective pressure difference removes the average value after a maximum and a minimum value.
Further, the time interval being acquired to N number of first zero measurement pressure difference is 5 to 20 milliseconds.
Second object of the present invention is a kind of calibration check method for providing differential pressure pickup, for pressure difference sensing
The accuracy of device calibration method is tested, and is comprised the following steps：
S21, continuous K collection the second zero point measurement pressure difference；Second zero point examine pressure difference under the conditions of zero point by institute
The pressure difference that the pressure differential detection unit of differential pressure pickup is detected is stated, the K is 50 to 300；
S22, calculated by the K the second zero points measurement pressure differences and obtain K zero point correction pressure difference, the zero point correction pressure difference
It is worth the=the second zero point measurement pressure difference-amount of bias；The amount of bias is obtained according to the calibration method of any of the above-described kind of differential pressure pickup
；
S23, the accuracy for judging according to the K zero point correction pressure difference differential pressure pickup calibration method.
Further, the step S23 includes：
When the K zero point correction pressure difference is in range of tolerable variance, the calibration method accuracy of the differential pressure pickup is determined
It is high；In the K zero point correction pressure difference at least one exceed range of tolerable variance when, determine the calibration side of the differential pressure pickup
Method accuracy is low；The range of tolerable variance is -2Pa to 2Pa.
Third object of the present invention is to provide a kind of differential pressure pickup, including pressure differential detection unit, processor and deposits
Storage media, it is characterised in that
The processor receives and handled the pressure difference data that the pressure differential detection unit is detected；
Store a plurality of instruction in the storage medium, the instruction by the computing device when realize any pressure as described above
The step of calibration method of gap sensor.
Further, the instruction can also be made the processor realization any as described above during the computing device
The step of calibration check method of differential pressure pickup.
Further, the differential pressure pickup also includes pressure difference display unit, and the pressure difference display unit is used for will be described
The calibrating value obtained after processor processing carries out display output.
The differential pressure pickup that the present invention is provided, can carry out dynamic corrections, without artificial by software to measurement pressure difference
Input calibration parameter is the real time calibration that can be achieved to measure differential pressure pickup pressure difference；In addition, by being carried out to calibration result
Examine, it is possible to increase the accuracy of calibration.
Brief description of the drawings
Fig. 1 is the flow chart of the calibration method of differential pressure pickup in first embodiment of the invention.
Fig. 2 is the flow chart of the calibration method of differential pressure pickup in a specific embodiment of the invention.
Fig. 3 is the flow chart of the calibration method of differential pressure pickup in second embodiment of the invention.
Fig. 4 is the flow chart of the calibration method of differential pressure pickup in another specific embodiment of the present invention.
Fig. 5 is the flow chart of the calibration check method of differential pressure pickup in third embodiment of the invention.
Fig. 6 is the flow chart of the calibration check method of differential pressure pickup in still another embodiment of the present invention.
Fig. 7 is the structured flowchart of differential pressure pickup in four embodiment of the invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and the embodiments,
The present invention will be described in further detail.
As shown in figure 1, first embodiment of the invention provides a kind of calibration method of differential pressure pickup, for described
The pressure difference that the pressure differential detection unit of differential pressure pickup is detected is calibrated, and is comprised the following steps：
S11, continuous n times collection first zero measurement pressure difference；The first zero measurement pressure difference is zero point condition by described
The pressure difference that the pressure differential detection unit is detected, the N is 5 to 20；
S12, to N number of first zero measurement pressure difference carry out denoising, obtain N number of zero point denoising pressure difference；
S13, the amount of bias according to N number of zero point denoising pressure difference calculating differential pressure pickup；
S14, using the amount of bias measurement pressure difference of the pressure differential detection unit is calibrated, obtain calibrating value；Institute
State calibrating value=measurement pressure difference-amount of bias.
Wherein, the zero point condition refers to set described two ports of differential pressure pickup to be under same pressure condition.
For in present embodiment to pressure difference carry out n times collection total collection duration, it is preferred that be arranged on for 3 to
In 10 seconds；The time interval of i.e. double collection is 250 milliseconds to 2 seconds.This be due to collection duration it is too short, acquisition it is N number of
Zero point measurement pressure difference lacks representative；Collection duration is long, then influences the calibration efficiency of differential pressure pickup.
For in step S12 to N number of first zero measure pressure difference denoising method, the present invention have no it is specifically limited, compared with
Good, Kalman filtering algorithm denoising is used in present embodiment.
For the computational methods of the amount of bias, in present embodiment, the amount of bias is N number of zero point denoising pressure difference
Value removes the average value after a maximum and a minimum value.
A specific embodiment of the invention provides a kind of calibration method to differential pressure pickup, wherein first zero measurement pressure
The collecting quantity N of difference is 10, is 3 seconds, the time of double collection to total acquisition time of 10 collections in this programme
At intervals of 300 milliseconds.
Specifically, as shown in Fig. 2 the calibration method of the present embodiment differential pressure pickup comprises the following steps：
S111, setting differential pressure pickup zero point condition；Wherein zero point condition is in for described two ports of differential pressure pickup of setting
Under same pressure condition；
S112, collection first zero measurement pressure difference；First zero measurement pressure difference is by the pressure difference under the conditions of zero point
The pressure difference that detection unit is detected；
S113, judge whether the collecting quantity of first zero measured value of collection reaches 10；When adopting for first zero measured value
When collection quantity is not up to 10, repeat step S112；When the collecting quantity of first zero measured value reaches 10, step is carried out
S12；
S12, denoisings are carried out to 10 first zero measurement pressure differences, obtain 10 zero point denoising pressure differences；In the present embodiment, use
Kalman filtering algorithm carries out denoising to 10 first zero measurement pressure differences；
S13, the amount of bias according to 10 zero point denoising pressure differences calculating differential pressure pickups；In the present embodiment, the biasing
Measure and the average value after a maximum and a minimum value is removed for 10 zero point denoising pressure differences；
S14, using the amount of bias measurement pressure difference of the pressure differential detection unit is calibrated, obtain calibrating value；Institute
State calibrating value=measurement pressure difference-amount of bias.
As shown in figure 3, second embodiment of the invention provides a kind of calibration method of differential pressure pickup, for described
The pressure difference that the pressure differential detection unit of differential pressure pickup is detected is calibrated, and is comprised the following steps：
S11, continuous n times collection first zero measurement pressure difference；First zero measurement pressure difference under the conditions of zero point by institute
The pressure difference that pressure differential detection unit is detected is stated, the N is 5 to 20；
S12, to N number of first zero measurement pressure difference carry out denoising, obtain N number of zero point denoising pressure difference；
S131, calculated by the N number of zero point denoising pressure difference and obtain an effective pressure difference；Effective pressure difference is the N
Individual zero point denoising pressure difference removes the average value after a maximum and a minimum value；
S132, calculate M effectively pressure differences；The M is 10 to 100；
S133, the amount of bias according to the M effective pressure differences calculating differential pressure pickups；The amount of bias is the M
Effective pressure difference removes the average value after a maximum and a minimum value；
S14, using the amount of bias measurement pressure difference of the pressure differential detection unit is calibrated, obtain calibrating value；Institute
State calibrating value=measurement pressure difference-amount of bias.
It should be noted that compared with first embodiment, continuous n times collection first zero measurement pressure in present embodiment
The step of difference, has been carried out M times altogether, and when maintaining total collection a length of 3 to 10 seconds, the time interval of double collection is about 5
To 20 milliseconds.
Present embodiment measures the first zero collecting quantity of pressure difference compared with the calibration method of first embodiment
Increase, while also passing through multiple denoising and calculating, so that the calculating of amount of bias is more accurate.
The present invention is measured yet another embodiment provides a kind of calibration method to differential pressure pickup, the wherein first zero
The collection total duration of pressure difference is 3 seconds；The time interval of collection is 10 milliseconds；N is that 10, M is 30.
Specifically, as shown in figure 4, the calibration method of the present embodiment differential pressure pickup comprises the following steps：
S111, setting differential pressure pickup zero point condition；Wherein zero point condition is in for described two ports of differential pressure pickup of setting
Under same pressure condition；
S112, collection first zero measurement pressure difference；First zero measurement pressure difference is by the pressure difference under the conditions of zero point
The pressure difference that detection unit is detected；
S113, judge whether the collecting quantity of first zero measured value of collection reaches 10；When adopting for first zero measured value
When collection quantity is not up to 10, repeat step S112；When the collecting quantity of first zero measured value reaches 10, step is carried out
S12；
S12, denoisings are carried out to 10 first zero measurement pressure differences, obtain 10 zero point denoising pressure differences；In the present embodiment, use
Kalman filtering algorithm carries out denoising to 10 first zero measurement pressure differences；
S131, calculated by 10 zero point denoising pressure differences and obtain an effective pressure difference；Effective pressure difference is 10 zero points
Denoising pressure difference removes the average value after a maximum and a minimum value；
S132, judge whether the quantity of effective pressure difference reaches 30；When the quantity of effective pressure difference is not up to 30, repeat to walk
Rapid S112, S113, S12 and S131；When the quantity of effective pressure difference reaches 30, step S133 is carried out；
S133, the amount of bias according to described 30 effective pressure differences calculating differential pressure pickups；The amount of bias, which is 30, to be had
Imitate pressure difference and remove the average value after a maximum and a minimum value；
S14, using the amount of bias measurement pressure difference of the pressure differential detection unit is calibrated, obtain calibrating value；Institute
State calibrating value=measurement pressure difference-amount of bias.
As shown in figure 5, third embodiment of the invention provide a kind of differential pressure pickup calibration check method, for pair
The accuracy of differential pressure pickup calibration method is tested, and is comprised the following steps：
S21, continuous K collection the second zero point measurement pressure difference；Second zero point examine pressure difference under the conditions of zero point by institute
The pressure difference that the pressure differential detection unit of differential pressure pickup is detected is stated, the K is 50 to 300；
S22, calculated by the K the second zero points measurement pressure differences and obtain K zero point correction pressure difference, the zero point correction pressure difference
It is worth the=the second zero point measurement pressure difference-amount of bias；The amount of bias is obtained according to the calibration method of any of the above-described kind of differential pressure pickup
；
S23, the accuracy for judging according to the K zero point correction pressure difference differential pressure pickup calibration method.
It should be noted that the second zero point measurement pressure difference measures the acquisition time of pressure difference with the first zero
It is different.
For K value, when being gathered with total collection duration to the second zero point measurement pressure difference and adjacent both sides of the K
Between be spaced it is relevant；It is preferred that a length of 1 to 3 second when measuring the collection of pressure difference to the second zero point；Acquisition time is at intervals of 10 to 60
Millisecond.
This programme step is simple, the accuracy of differential pressure pickup calibration method can be judged, so as to effectively improve
The accuracy calibrated to differential pressure pickup.
Still another embodiment of the present invention is provided in a kind of calibration check method to differential pressure pickup, the present embodiment,
A length of 1 second during collection, acquisition time is at intervals of 10 milliseconds, and K is 100.
Specifically, as shown in fig. 6, comprising the following steps：
S211, setting differential pressure pickup zero point condition；Wherein zero point condition is in for described two ports of differential pressure pickup of setting
Under same pressure condition；
S212, collection the second zero point measurement pressure difference；Second zero point measurement pressure difference is by the pressure difference under the conditions of zero point
The pressure difference that the pressure differential detection unit of sensor is detected；
S221, according to the second zero point measure pressure difference calculate zero point correction pressure difference；The wherein zero point of zero point correction pressure difference=second
Measure pressure difference-amount of bias；The amount of bias is obtained according to the calibration method of any of the above-described kind of differential pressure pickup；
S222, judge whether the quantity of zero point correction pressure difference reaches 100；When the quantity of zero point correction pressure difference is not up to
At 100, repeat step S212 and S221；When the quantity of zero point correction pressure difference reaches 100, step S23 is carried out；
S23, judge 100 zero point correction pressure differences whether in range of tolerable variance；When 100 zero point correction pressure differences are in tolerance
In the range of when, determine that the calibration method accuracy of the differential pressure pickup is high；At least one in 100 zero point correction values
It is individual exceed range of tolerable variance when, determine that the calibration method accuracy of the differential pressure pickup is low；The range of tolerable variance be -2Pa extremely
2Pa。
It should be noted that the determination of range of tolerable variance needs to consider the resolution ratio of differential pressure pickup to be calibrated, using the biography
The factors such as the equipment of sensor, preferably, range of tolerable variance has preferable applicability in -2Pa to 2Pa.
For the calibration method accuracy that determines the differential pressure pickup it is low in the case of, it usually needs check pressure difference sensing
Whether device is properly set zero point condition, and sensor whether there is failure problems, calibration is then re-started again.
As shown in fig. 7, four embodiment of the invention provides a kind of differential pressure pickup, including pressure differential detection unit, place
Manage device and storage medium；The processor receives and handled the pressure difference data that the pressure differential detection unit is detected；
A plurality of instruction is stored in the storage medium, is realized when the instruction is as the computing device described in any of the above-described kind
The step of calibration method of differential pressure pickup.
The differential pressure pickup that present embodiment is provided, the instruction stored in storage medium is performed by processor automatically, from
And the calibration to pressure differential detection unit can be realized automatically.
Further, the instruction can also be made the processor realize any of the above-described kind of pressure during the computing device
The step of calibration check method of gap sensor.The differential pressure pickup of this programme can be verified to calibration result, be improved
The accuracy of differential pressure pickup calibration.
Further, the differential pressure pickup also includes pressure difference display unit, and the pressure difference display unit is used for will be described
The calibrating value obtained after processor processing carries out display output.
The better embodiment of the present invention is the foregoing is only, is not intended to limit the invention, it is all the present invention's
Any modifications, equivalent substitutions and improvements made within spirit and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of calibration method of differential pressure pickup, the pressure difference detected for the pressure differential detection unit to the differential pressure pickup
Value is calibrated, it is characterised in that comprised the following steps：
S11, continuous n times collection first zero measurement pressure difference；First zero measurement pressure difference under the conditions of zero point by institute
The pressure difference that pressure differential detection unit is detected is stated, the N is 5 to 20；
S12, to N number of first zero measurement pressure difference carry out denoising, obtain N number of zero point denoising pressure difference；
S13, the amount of bias according to N number of zero point denoising pressure difference calculating differential pressure pickup；
S14, using the amount of bias measurement pressure difference of the pressure differential detection unit is calibrated, obtain calibrating value；Institute
State calibrating value=measurement pressure difference-amount of bias.
2. the calibration method of differential pressure pickup according to claim 1, it is characterised in that the amount of bias is described N number of
Zero point denoising pressure difference removes the average value after a maximum and a minimum value.
3. the calibration method of differential pressure pickup according to claim 2, it is characterised in that double collection described first
The time interval of zero point measurement pressure difference is 250 milliseconds to 2 seconds.
4. the calibration method of differential pressure pickup according to claim 1, it is characterised in that the step S13 includes following
Step：
S131, calculated by the N number of zero point denoising pressure difference and obtain an effective pressure difference；Effective pressure difference is the N
Individual zero point denoising pressure difference removes the average value after a maximum and a minimum value；
S132, repeat step S11, S12, S131, calculating obtain M effectively pressure differences；The M is 10 to 100；
S133, the amount of bias according to the M effective pressure differences calculating differential pressure pickups；The amount of bias is the M
Effective pressure difference removes the average value after a maximum and a minimum value.
5. the calibration method of differential pressure pickup according to claim 4, it is characterised in that double collection described first
The time interval of zero point measurement pressure difference is 5 to 20 milliseconds.
6. a kind of calibration check method of differential pressure pickup, tests for the accuracy to differential pressure pickup calibration method,
It is characterised in that it includes following steps：
S21, continuous K collection the second zero point measurement pressure difference；Second zero point examine pressure difference under the conditions of zero point by institute
The pressure difference that the pressure differential detection unit of differential pressure pickup is detected is stated, the K is 50 to 300；
S22, calculated by the K the second zero points measurement pressure differences and obtain K zero point correction pressure difference, the zero point correction pressure difference
It is worth the=the second zero point measurement pressure difference-amount of bias；Amount of bias pressure difference sensing according to any one of claim 1 to 5
The calibration method of device is obtained；
S23, the accuracy for judging according to the K zero point correction pressure difference differential pressure pickup calibration method.
7. the calibration check method of differential pressure pickup according to claim 6, it is characterised in that the step S23 includes：
When the K zero point correction pressure difference is in range of tolerable variance, the calibration method accuracy of the differential pressure pickup is determined
It is high；In the K zero point correction pressure difference at least one exceed range of tolerable variance when, determine the calibration side of the differential pressure pickup
Method accuracy is low；The range of tolerable variance is -2Pa to 2Pa.
8. a kind of differential pressure pickup, including pressure differential detection unit, processor and storage medium, it is characterised in that
The processor receives and handled the pressure difference data that the pressure differential detection unit is detected；
Store a plurality of instruction in the storage medium, the instruction by the computing device when realize such as claim 1 to 5
Any one of differential pressure pickup calibration method the step of.
9. differential pressure pickup according to claim 8, it is characterised in that may be used also when the instruction is by the computing device
So that the step of processor realizes the calibration check method of differential pressure pickup as claimed in claims 6 or 7.
10. differential pressure pickup according to claim 8, it is characterised in that the differential pressure pickup is also shown including pressure difference
Unit, the pressure difference display unit is used to the calibrating value obtained after processor processing carrying out display output.
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| CN109238407A (en) * | 2018-08-09 | 2019-01-18 | 安徽省锐凌计量器制造有限公司 | A kind of Internet of Things big data acquisition processing system that can ensure accuracy |
| CN109579898A (en) * | 2018-12-25 | 2019-04-05 | 佛山科学技术学院 | A kind of intelligence manufacture sensing data spatial calibration method and device |
| CN109738049B (en) * | 2018-12-29 | 2020-11-06 | 南京畅物网络科技有限公司 | Method for calibrating dynamic weighing precision |
| CN109738049A (en) * | 2018-12-29 | 2019-05-10 | 南京畅物网络科技有限公司 | A method of calibration dynamic weighing precision |
| CN109884341A (en) * | 2019-03-25 | 2019-06-14 | 中煤科工集团重庆研究院有限公司 | The method and system that the pressure difference zero point value of measuring wind speed is calibrated automatically |
| CN110398316A (en) * | 2019-08-23 | 2019-11-01 | 山东福瑞德测控系统有限公司 | Differential pressure transmitter and automatic calibrating method for differential pressure transmitter |
| CN111721466A (en) * | 2020-06-28 | 2020-09-29 | 东风汽车集团有限公司 | Method and system for correcting zero drift of pressure sensor |
| CN111721466B (en) * | 2020-06-28 | 2021-08-06 | 东风汽车集团有限公司 | Method and system for correcting zero drift of pressure sensor |
| CN115655574A (en) * | 2022-09-29 | 2023-01-31 | 深圳天润控制技术股份有限公司 | Screening method and device of differential pressure type sensor and storage medium |
| CN115655574B (en) * | 2022-09-29 | 2023-09-15 | 深圳天润控制技术股份有限公司 | Screening method and device of differential pressure sensor and storage medium |
| CN116105925A (en) * | 2023-03-22 | 2023-05-12 | 潍柴动力股份有限公司 | Correction method and device for DPF differential pressure sensor measured value and vehicle |
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Application publication date: 20170908 |