CN117516667A - Calibration checking device and method for thermopile type gas flowmeter transmitter - Google Patents
Calibration checking device and method for thermopile type gas flowmeter transmitter Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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Abstract
The invention relates to the technical field of thermopile type gas flow meters, in particular to a calibration and inspection device and method for a thermopile type gas flow meter transmitter. The device comprises a flow signal generating circuit, a checking circuit, a touch display screen and an MCU; the method comprises a calibration method and a test method. The conventional thermal mass flow meter requires an integral real flow calibration with a calibration coefficient kz=ks+ KTx, wherein neither the calibration coefficient KTx of the transmitter nor the coefficient Ks of the sensor can be independently found. The invention can directly calculate KTx, and can obtain the sensor calibration coefficient Ks after real-flow calibration, and by the method, the mutual replacement of the transmitters can be realized, the problem of repeated real-flow calibration is avoided, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of thermopile type gas flow meters, in particular to a calibration and inspection device and method for a thermopile type gas flow meter transmitter.
Background
The flow meter is used as a key device for measuring flow, and plays a vital role in the fields of industrial production, aerospace, automotive electronics, medical health and the like. The flow meters can be divided into various types according to different measurement principles, wherein the thermal flow meters have the advantages of simple structure, high measurement sensitivity, low power consumption, capability of measuring the mass flow of fluid and the like. Is widely paid attention to by research and development personnel. With the development of the MEMS technology, the thermal flow meter based on the MEMS technology is gradually applied to various industries because of the advantages of small size, low power consumption, high precision and the like. Particularly in the field of civil products with relatively large demand, such as respirators, oxygenerators and the like.
The working principle of the MEMS thermal mass instrument is that a fluid to be measured is heated by a heating resistor, and the temperature change of gas in a heating area is detected by a temperature sensitive element, so that the mass flow of the fluid to be measured is converted. In the production process of the MEMS thermal mass flow meter, real-flow calibration needs to be carried out on each product, and the MEMS thermal mass flow meter comprises two parts, namely a MEMS thermopile sensor and a transmitter. In the real-flow calibration process, the two parts are calibrated and verified simultaneously. This has the following drawbacks:
1. because of the integral calibration and verification, if the problem is in the transmitter part, it cannot be found in the early stage, which increases the production cost and the time cost.
2. After the transmitter is replaced, the calibration coefficient of the whole meter is changed, the process needs to be carried out again, and the production time cost is increased.
3. The transmitter exchange is realized, and the maintenance cost is reduced.
Disclosure of Invention
The invention provides a calibration checking device and a calibration checking method for a thermopile type gas flowmeter transmitter, which can solve the problem of data deviation of a flowmeter caused by transmitter errors.
To solve the above technical problems, in one aspect, the present invention provides a calibration checking device for a thermopile type gas flowmeter transmitter, comprising: a flow signal generation circuit;
the flow signal generating circuit is used for receiving excitation current generated by the transmitter, converting the excitation current into a voltage signal, amplifying the voltage signal, calculating a flow signal through partial pressure, inputting the flow signal into the transmitter, and completing calibration of the transmitter according to the flow signal.
An advantage of this embodiment is that conventional thermal mass flow meters require an integral real flow calibration with a calibration factor kz=ks+ KTx, where neither the calibration factor KTx of the transmitter nor the factor Ks of the sensor can be found independently. The invention can directly calculate KTx, and can obtain the sensor calibration coefficient Ks after real-flow calibration, and by the method, the mutual replacement of the transmitters can be realized, the problem of repeated real-flow calibration is avoided, and the production efficiency is improved.
As a preferable mode of the above technical solution, the current signal generating circuit includes a current sampling resistor Rs, the current sampling resistor is connected with an amplifying circuit, the amplifying circuit is connected with a precision resistor network through a first analog switch SW1, the precision resistor network is connected with an active low-pass filter, and the active low-pass filter is connected with a transmitter.
As a preferable mode of the above technical solution, the active low-pass filter is connected with the transmitter through a fifth analog switch SW5 and a sixth analog switch SW 6;
the device further comprises a checking circuit connected between the fifth analog switch SW5 and the sixth analog switch SW 6.
As the preferable choice of the technical scheme, the checking circuit is used for acquiring the actual flow value of the flow signal, comparing the actual flow value with the preset flow value and finishing calibration checking.
The checking circuit comprises a first integrating circuit and a second integrating circuit which are mutually connected in series, wherein the input end of the first integrating circuit is connected with the fifth analog switch SW5, and the output end of the second integrating circuit is connected with the sixth analog switch SW 6.
As an optimization of the technical scheme, the device further comprises a touch display screen and an MCU;
the MCU controls the flow signal generating circuit, the transmitter, the checking circuit and the touch display screen to work;
and the touch display screen provides an interactive interface with a user and displays the display information sent by the MCU.
In order to solve the technical problems, on the other hand, the invention provides a calibration and inspection method for a thermopile type gas flowmeter transmitter, which comprises the following steps:
controlling the transducer to generate an excitation current I RL ；
Converting the excitation current into a voltage signal;
calculating an actual flow value by dividing the voltage signal for a plurality of times;
linearly fitting the actual flow value and the preset flow value to obtain a calibration coefficient K TX 。
As a preferable mode of the technical scheme, the calibration coefficient K is calculated TX The calibration method of the transmitter further comprises the verification step, and the method specifically comprises the following steps:
through the calibration coefficient K TX Outputting a calibrated excitation current by the corrected transmitter;
converting the calibrated excitation current into a calibrated voltage signal;
calculating the actual flow value after calibration by dividing the voltage of the calibration voltage signal for a plurality of times;
and judging whether the calibration is effective or not according to the error between the actual flow value after the calibration and the preset flow value.
As a preferable mode of the above technical scheme, the method for inspecting the transmitter is as follows:
controlling the transmitter to preset frequency f e Generating an excitation current I RL ；
Converting excitation current to a frequency f e Is a voltage signal of (a);
frequency f e Is equal to tau in time constant 1 Generates sawtooth wave after passing through the first integrating circuit with time constant of tau 2 Generating a sinusoidal voltage signal, inputting the sinusoidal voltage signal to the transmitter;
and the transmitter respectively performs precision inspection, repeatability inspection, response time inspection and frequency inspection according to the sinusoidal voltage signals, and judges whether the transmitter is qualified.
As preferable of the above technical solutions, the specific methods of the accuracy test, the repeatability test, the response time test and the frequency test are as follows:
periodically and continuously sampling the sinusoidal voltage signal to obtain a maximum actual flow value Qmax, an actual minimum flow value Qmin, rise time Ttx, up and fall time Ttx, down;
calculating a maximum actual flow deviation and a minimum actual flow deviation according to a preset flow value, wherein the formula is as follows:
the time between the maximum actual flow value Qmax,1 and Qmax,2 of two adjacent sampling periods is calculated, and the formula is:
repeating the sampling for a plurality of times, and calculating an average maximum actual flow value, an average minimum actual flow value, an average rising time, an average falling time, a maximum actual flow deviation and a minimum actual flow deviation, wherein the formula is as follows:
in the process of calculating multiple times of sampling, the standard deviation of the maximum actual flow value and the minimum actual flow value is calculated according to the formula:
if it isA is an operational definition constant, the repeatability of the transmitter is judged to be qualified, and otherwise, the transmitter is not qualified;
order theIf D is less than or equal to b, wherein b is an arithmetic definition constant, judging that the precision of the transmitter is qualified, otherwise, disqualification;
order theIf delta t is less than or equal to c+tau, wherein c is a calculated definition constant, v is a time constant in the checking circuit, judging that the response time of the transmitter is qualified, otherwise, disqualification;
order theWherein t is Q max For the response time corresponding to the maximum flow value Qmax of the current sampling period, if +.>And lambda is less than or equal to +/-2%, judging that the frequency of the transmitter is qualified through inspection, and otherwise, judging that the frequency of the transmitter is unqualified.
The embodiment has the advantages that a specific method for separately checking the precision check, the repeatability check, the response time check and the frequency check of the transmitter is provided, the transmitter is made into data, and a theoretical basis is provided for improving the precision of the thermopile type gas flowmeter; the embodiment can realize simulating real-time thermal sensing voltage signals, and can set different voltage values to simulate different flow information, so that the thermal mass flow meter transmitter can be verified in batches. In combination with the programming of the transmitter. And the response speed of the transmitter is checked. The quality of the product is ensured, and the production efficiency is improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
FIG. 1 is a schematic diagram of the circuit principle of the calibration test device in embodiment 1;
fig. 2 is a schematic diagram showing a specific circuit configuration of the flow signal generating circuit in embodiment 1;
FIG. 3 is a schematic diagram showing a specific circuit configuration of the inspection circuit in embodiment 1;
FIG. 4 is a schematic flow chart of the test method in example 2;
FIG. 5 is a schematic flow chart of the standard test method in example 2.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions according to the embodiments of the present invention will be clearly described in the following with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
as shown in fig. 1, 2 and 3, an embodiment of the present invention provides a calibration and inspection device for a thermopile type gas flowmeter transmitter, which includes a flow signal generating circuit, an inspection circuit, a touch display screen and an MCU.
The flow signal generating circuit is used for receiving excitation current generated by the transmitter, converting the excitation current into a voltage signal, amplifying the voltage signal, calculating a flow signal through partial pressure, inputting the flow signal into the transmitter, and completing calibration of the transmitter according to the flow signal.
In this embodiment, the flow signal generating circuit, the excitation current I generated by the transducer RL A voltage signal Us1 is obtained through a current sampling resistor Rs, and the signal is input with high precision, low zero drift and high impedance,The precision instrument operational amplifier of low impedance output is amplified by a factor of G. The amplified signals are expressed as GUs1, the GUs1 enter a precision resistor network through an analog switch SW1, the SW1 analog switch is controlled by an IO port of an MCU, after the GUs1 signal enters the precision resistor network, the MCU controls SW2, SW3 and SW4 through digital signals of the IO port according to the selection of flow calibration points, and voltage signals flowing through the SW2, SW3 and SW4 correspond to preset flow values according to the voltage division principle of the resistor network. The voltage signal passes through an active low-pass filter LPF, and the amplification gain of the low-pass filter may be adjusted according to the actual situation. In the state through analog switch SW 5), state 1 of SW6 is output to signal input port Sg1 or Sg2 of the transmitter.
Specifically, the current signal generating circuit comprises a current sampling resistor Rs, the current sampling resistor is connected with an amplifying circuit, the amplifying circuit is connected with a precision resistor network through a first analog switch SW1, the precision resistor network is connected with an active low-pass filter, and the active low-pass filter is connected with a transmitter.
Specifically, the verification circuitry is connected between the fifth analog switch SW5 and the sixth analog switch SW6, and the active low pass filter is connected to the transmitter through the fifth analog switch SW5 and the sixth analog switch SW 6. The checking circuit comprises a first integrating circuit and a second integrating circuit which are mutually connected in series, wherein the input end of the first integrating circuit is connected with the fifth analog switch SW5, and the output end of the second integrating circuit is connected with the sixth analog switch SW 6.
In this embodiment, the verification circuitry is primarily to verify that the performance of the transmitter meets product requirements. At this point the transmitter enters a test mode, which is based primarily on frequency f e Switching on and off the excitation current I RL The output waveform is effectively of frequency f e A square wave which enters the flow signal generating circuit and outputs a frequency f according to the set flow according to the mode e The analog switch SW5 is switched to state 2, the signal is input to the input end of the response checking circuit, the sawtooth wave is generated after passing through the first integrating circuit, and the time constant is tau 1 Then through an integrating circuit, the time constant is tau 2 The method comprises the steps of carrying out a first treatment on the surface of the The sawtooth wave is converted to a sinusoidal voltage signal which is transmitted through state 2 of SW6 to signal inlet Sg1 or Sg2 of the transmitter. After the transmitter carries out analog-to-digital conversion on the signal, the MCU of the transmitter carries out processing analysis and analysis on the processed logic.
Specifically, the MCU controls the flow signal generating circuit, the transmitter, the checking circuit and the touch display screen to work;
specifically, the touch display screen provides an interactive interface with a user, and displays display information sent by the MCU.
In embodiment 1, the precision resistor network can be replaced by a digital potentiometer, the instrument operational amplifier for current sampling can be a differential amplifying circuit, and the MCU part can be replaced by a computer.
Example 2:
a calibration verification method for a thermopile gas flow meter transmitter, as shown in fig. 5, includes a calibration method and a verification method.
S1, the specific steps of the calibration method are as follows:
s11, controlling the transducer to generate exciting current I RL ；
S12, converting excitation current into a voltage signal;
s13, calculating an actual flow value by dividing the voltage signal for a plurality of times;
s14, linearly fitting the actual flow value and the preset flow value to obtain a calibration coefficient K TX 。
S15, verification step:
s151, through calibration coefficient K TX Outputting a calibrated excitation current by the corrected transmitter;
s152, converting the calibration excitation current into a calibration voltage signal;
s153, calculating the actual flow value after calibration by dividing the voltage of the calibration voltage signal for a plurality of times;
and S154, judging whether the calibration is effective according to the error between the actual flow value after the calibration and the preset flow value.
S2, the specific steps of the inspection method are as follows:
s21, controlling the transmitter to preset frequencyRate f e Generating an excitation current I RL ；
S22, converting the excitation current into frequency f e Is a voltage signal of (a);
s23, frequency f e Is equal to tau in time constant 1 Generates sawtooth wave after passing through the first integrating circuit with time constant of tau 2 Generating a sinusoidal voltage signal, inputting the sinusoidal voltage signal to the transmitter;
s24, respectively performing precision test, repeatability test, response time test and frequency test on the transmitter according to the sinusoidal voltage signal, and judging whether the transmitter is qualified.
The specific methods of accuracy test, repeatability test, response time test and frequency test are as follows:
s241, periodically and continuously sampling the sinusoidal voltage signal to obtain a maximum actual flow value Qmax, an actual minimum flow value Qmin, rise time Ttx, up and fall time Ttx, down;
calculating a maximum actual flow deviation and a minimum actual flow deviation according to a preset flow value, wherein the formula is as follows:
the time between the maximum actual flow value Qmax,1 and Qmax,2 of two adjacent sampling periods is calculated, and the formula is:
repeating the sampling for a plurality of times, and calculating an average maximum actual flow value, an average minimum actual flow value, an average rising time, an average falling time, a maximum actual flow deviation and a minimum actual flow deviation, wherein the formula is as follows:
in the process of calculating multiple times of sampling, the standard deviation of the maximum actual flow value and the minimum actual flow value is calculated according to the formula:
s242, ifA is an operational definition constant, the repeatability of the transmitter is judged to be qualified, and otherwise, the transmitter is not qualified;
order theIf D is less than or equal to b, wherein b is an arithmetic definition constant, judging that the precision of the transmitter is qualified, otherwise, disqualification;
order theIf delta t is less than or equal to c+tau, wherein c is a calculated definition constant, tau is a time constant in the checking circuit, judging that the response time of the transmitter is qualified, otherwise, disqualification;
order theWherein t is Q max For the response time corresponding to the maximum flow value Qmax of the current sampling period, if +.>And lambda is less than or equal to +/-2%, judging that the frequency of the transmitter is qualified through inspection, and otherwise, judging that the frequency of the transmitter is unqualified.
S243, all standards pass the test, the transmitter sends the test information to the inspection equipment through the serial port, and the test information is displayed through the display screen. If any one of the above tests does not meet the passing condition, a 'failed' message is sent to the display screen of the inspection device, and a dialog box is popped up for the user to select whether the inspection needs to be performed again. If the user selects no, the system stops running. If the user selects yes, return to initializing and repeat the above steps.
In embodiment 2, the sine signal can be replaced by a step signal or a sawtooth wave as a checking signal for checking the response of the transmitter, and calibration calculation and checking of the response speed can be completed at a computer end.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A calibration verification device for a thermopile gas flow meter transmitter, comprising: a flow signal generation circuit;
the flow signal generating circuit is used for receiving excitation current generated by the transmitter, converting the excitation current into a voltage signal, amplifying the voltage signal, calculating a flow signal through partial pressure, inputting the flow signal into the transmitter, and completing calibration of the transmitter according to the flow signal.
2. The calibration verification device for a thermopile gas flowmeter transmitter of claim 1, wherein the current signal generating circuit comprises a current sampling resistor Rs connected to an amplifying circuit, the amplifying circuit is connected to a precision resistor network via a first analog switch SW1, the precision resistor network is connected to an active low-pass filter, and the active low-pass filter is connected to the transmitter.
3. The calibration verification device for a thermopile gas flow meter transmitter of claim 2, wherein the active low pass filter is connected to the transmitter through a fifth analog switch SW5 and a sixth analog switch SW 6;
the device further comprises a checking circuit connected between the fifth analog switch SW5 and the sixth analog switch SW 6.
4. The calibration verification device for a thermopile gas flowmeter transmitter of claim 3, wherein the verification circuit is configured to obtain an actual flow value of the flow signal, compare the actual flow value with a preset flow value, and complete the calibration verification.
The checking circuit comprises a first integrating circuit and a second integrating circuit which are mutually connected in series, wherein the input end of the first integrating circuit is connected with the fifth analog switch SW5, and the output end of the second integrating circuit is connected with the sixth analog switch SW 6.
5. The calibration verification device for a thermopile gas flow meter transmitter of claim 4, further comprising a touch display and an MCU;
the MCU controls the flow signal generating circuit, the transmitter, the checking circuit and the touch display screen to work;
and the touch display screen provides an interactive interface with a user and displays the display information sent by the MCU.
6. A calibration and inspection method for a thermopile type gas flowmeter transmitter is characterized in that the specific calibration method of the transmitter is as follows:
controlling the transducer to generate an excitation current I RL ；
Converting the excitation current into a voltage signal;
calculating an actual flow value by dividing the voltage signal for a plurality of times;
linearly fitting the actual flow value and the preset flow value to obtain a calibration coefficient K TX 。
7. The calibration verification method for a thermopile gas flowmeter transmitter of claim 6, wherein the calibration factor K is calculated TX The calibration method of the transmitter further comprises the verification step, and the method specifically comprises the following steps:
through the calibration coefficient K TX Outputting a calibrated excitation current by the corrected transmitter;
converting the calibrated excitation current into a calibrated voltage signal;
calculating the actual flow value after calibration by dividing the voltage of the calibration voltage signal for a plurality of times;
and judging whether the calibration is effective or not according to the error between the actual flow value after the calibration and the preset flow value.
8. The calibration verification method for a thermopile gas flow meter transmitter of claim 6, wherein the transmitter verification method is as follows:
controlling the transmitter to preset frequency f e Generating an excitation current I RL ；
Converting excitation current to a frequency f e Is a voltage signal of (a);
frequency f e Is equal to tau in time constant 1 Generates sawtooth wave after passing through the first integrating circuit with time constant of tau 2 Generating a sinusoidal voltage signal, inputting the sinusoidal voltage signal to the transmitter;
and the transmitter respectively performs precision inspection, repeatability inspection, response time inspection and frequency inspection according to the sinusoidal voltage signals, and judges whether the transmitter is qualified.
9. The calibration verification method for a thermopile gas flow meter transmitter of claim 8, wherein the specific methods of accuracy verification, repeatability verification, response time verification, and frequency verification are as follows:
periodically and continuously sampling the sinusoidal voltage signal to obtain a maximum actual flow value Qmax, an actual minimum flow value Qmin, rise time Ttx, up and fall time Ttx, down;
calculating a maximum actual flow deviation and a minimum actual flow deviation according to a preset flow value, wherein the formula is as follows:
the time between the maximum actual flow value Qmax,1 and Qmax,2 of two adjacent sampling periods is calculated, and the formula is:
repeating the sampling for a plurality of times, and calculating an average maximum actual flow value, an average minimum actual flow value, an average rising time, an average falling time, a maximum actual flow deviation and a minimum actual flow deviation, wherein the formula is as follows:
in the process of calculating multiple times of sampling, the standard deviation of the maximum actual flow value and the minimum actual flow value is calculated according to the formula:
if it isA is an operational definition constant, the repeatability of the transmitter is judged to be qualified, and otherwise, the transmitter is not qualified;
order theIf D is less than or equal to b, wherein b is an arithmetic definition constant, judging that the precision of the transmitter is qualified, otherwise, disqualification;
order theIf delta t is less than or equal to c+tau, wherein c is a calculated definition constant, tau is a time constant in the checking circuit, judging that the response time of the transmitter is qualified, otherwise, disqualification;
order theWherein t is Qmax For the response time corresponding to the maximum flow value Qmax of the current sampling period, if +.>And lambda is less than or equal to +/-2%, judging that the frequency of the transmitter is qualified through inspection, and otherwise, judging that the frequency of the transmitter is unqualified.
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