CN112729430B - MSP430 single-chip microcomputer-based ultrasonic water meter measurement compensation method - Google Patents
MSP430 single-chip microcomputer-based ultrasonic water meter measurement compensation method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
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Abstract
The invention discloses an ultrasonic water meter measurement compensation method based on an MSP430 single chip microcomputer, which relates to the technical field of ultrasonic measurement, and adopts the scheme that: adjusting the programmable pulse generator and the physical interface PHY to minimize the zero flow drift; acquiring an NTC thermistor through an analog-to-digital converter, and converting the temperature; measuring the propagation TIME of the ultrasonic wave in a static state through an oscilloscope, and correcting an ADC _ SAMP _ TIME value of a ussSwlib.h file to obtain the optimal propagation TIME; measuring low power consumption to obtain upstream and downstream time, and calling a USS _ runAlgorithmsFixedPoint method to obtain volume flow; carrying out interpolation calculation on the obtained time difference and temperature through a fuzzy-interpolation algorithm so as to keep the error of the whole flow interval within a qualified range; and calling a USS _ calibresSignaLGain function at regular time, and adjusting the optimal gain reference to obtain the optimal propagation time in the long-term measurement process. The invention can compensate the influence of fluid temperature, transducer aging and water quality difference on ultrasonic measurement.
Description
Technical Field
The invention relates to the technical field of ultrasonic measurement, in particular to an ultrasonic water meter measurement compensation method based on an MSP430 single chip microcomputer.
Background
In the prior art, most domestic ultrasonic water meters using TDC-GP22 time-to-digital converters acquire upstream time and downstream time, wherein the TDC-GP22 time-to-digital converter adopts a zero-crossing comparison method for measurement, which is influenced by fluid temperature, transducer aging and poor water quality and may cause peak offset in acquisition.
The MSP430 series single chip microcomputer is a 16-bit ultra-low power consumption Mixed Signal Processor (Mixed Signal Processor) with Reduced Instruction Set (RISC) which is marketed by Texas Instruments (TI) in the United states in 1996. Aiming at the actual application requirements, the MSP430 series single chip microcomputer integrates a plurality of analog circuits with different functions, a digital circuit module and a microprocessor on one chip so as to provide a 'single chip microcomputer' solution. The MSP430 series single-chip microcomputer is mostly applied to portable instruments and meters which need to be powered by batteries.
Disclosure of Invention
The invention provides an ultrasonic water meter measurement compensation method based on an MSP430 single chip microcomputer, aiming at compensating the influence of fluid temperature, transducer aging and poor water quality on ultrasonic measurement.
The invention relates to an ultrasonic water meter measurement compensation method based on an MSP430 single chip microcomputer, which adopts the following technical scheme for solving the technical problems:
an ultrasonic water meter measurement compensation method based on an MSP430 single chip microcomputer comprises the following operation steps of:
(1) adjusting a programmable pulse generator and a physical interface PHY with a low impedance output driver to match the length of the pulse excitation according to the length of the acoustic channel at the measurement location to achieve optimal sensor excitation and accurate impedance matching, minimizing zero flow drift;
(2) acquiring an NTC thermistor through an analog-to-digital converter, and converting the temperature to correct the influence on ultrasonic wave transmission at different temperatures;
(3) measuring the propagation TIME of the ultrasonic wave in a static state by using an oscilloscope, and correcting an ADC _ SAMP _ TIME numerical value in a ussSwlib.h file to obtain the optimal propagation TIME;
(4) when low power consumption measurement is carried out, the amplitude is automatically amplified to a set amplitude value through a programmable gain amplifier, and the volume flow is obtained by calling a 'USS _ RunAlgorithmsFixedPoint' method;
(5) carrying out interpolation calculation on the measured time difference and temperature through a fuzzy-interpolation algorithm so as to keep the error of the whole flow interval within a qualified range;
(6) and calling a USS _ calibresitesignalalgan function of the USSLibGUIAPc.c file at regular time to adjust the optimal gain reference so as to obtain the optimal propagation time in the long-term measurement process.
Optionally, the step (3) is executed, and the specific operation of obtaining the optimal propagation time is as follows:
(3.1) acquiring the propagation time of the ultrasonic wave measured by the oscilloscope in a static state, and fitting to obtain a formula A: τ 0.5144 θ 2 16.002 theta +1148.7+ k, where tau is the delay time of the enabling stop pulse, theta is the fluid temperature, and k is the delay time correction factor;
(3.2) according to the acquired propagation TIME, correcting an ADC _ SAMP _ TIME value in a ussSwLib.h file, and shielding the TIME period from the transmission of the ultrasonic waves to the reception of the ultrasonic waves so as to reduce the interference before the echo does not reach the ultrasonic transducers and finally obtain the optimal propagation TIME.
Preferably, the "ADC _ SAMP _ TIME" value in the "ussswlib.h" file is corrected once.
Further alternatively, "ussswlib. h" is a file in the MSP430FR6007 library function, and ADC _ SAMP _ TIME is a variable in the file, representing the sampling on-TIME.
Optionally, when the step (4) is executed, the "ussibguiappc.c" file in the MSP430FR6007 library function is called, the ultrasonic wave is excited through the "autostart lowpowerultrasoundonicevaluation" function of the "ussibguiappc.c" file, and low power consumption measurement is performed.
Further optionally, in the measurement process, once the amplitude of the envelope acquired by the analog-to-digital converter is captured to be low, the programmable gain amplifier automatically amplifies the amplitude to a set amplitude value to obtain upstream and downstream times, and then a cross-correlation algorithm is performed by calling a "USS _ runalcogorithmsfixedpoint" method in an MSP430FR6007 library function to obtain the volume flow.
Further optionally, when step (5) is performed,
and (3) carrying out interpolation calculation on the measured time difference and temperature through a fuzzy-interpolation algorithm to obtain a formula B: q is (theta/S +1712) × delta t/2048, wherein q is flow error compensation, theta is temperature, delta t is upstream and downstream time difference, and S is a segmented empirical coefficient and is obtained from time difference at different flow rates;
based on the resulting flow error compensation, the flow volume is integrated such that the error over the entire flow interval remains within a qualified range.
Further optionally, step (6) is executed, and the specific operation of obtaining the optimal propagation time in the long-term measurement process is:
(6.1) calling the USS _ calibreS associated Gain regularly to obtain the gainRange;
(6.2) setting a gain value, judging whether the variation of the gainRange exceeds 5% of the last set gain value, if so, not performing calibration, and if not, performing calibration once per hour, so that the optimal propagation time is obtained in the long-term measurement process.
Compared with the prior art, the ultrasonic water meter measurement compensation method based on the MSP430 single chip microcomputer has the beneficial effects that:
the ultrasonic wave measuring device is based on the MSP430 single chip microcomputer, accurate measuring errors are achieved, ultrasonic wave measuring time is compensated, influences of fluid temperature, transducer aging and water quality difference on ultrasonic wave measurement are made up, and peak collection errors are avoided.
Drawings
FIG. 1 is a schematic diagram of an implementation state of a first embodiment of the present invention;
fig. 2 is a schematic diagram of the ultrasonic wave propagation time TOF measured in the first embodiment of the invention.
Detailed Description
In order to make the technical scheme, the technical problems to be solved and the technical effects of the present invention more clearly apparent, the following technical scheme of the present invention is clearly and completely described with reference to the specific embodiments.
The first embodiment is as follows:
referring to fig. 1, taking the ultrasonic transducers Transducer1 and Transducer2 as examples, the center distance from Transducer1 to Transducer2 is L.
The embodiment provides an ultrasonic water meter measurement compensation method based on an MSP430 single chip microcomputer, and the operation steps for realizing compensation comprise:
(1) based on L, the programmable pulse generator and the physical interface PHY with low impedance output driver are adjusted to achieve optimal sensor excitation and accurate impedance matching, minimizing zero flow drift. The operation can improve the consistency of the ultrasonic water meter and is also beneficial to the subsequent batch production of the ultrasonic water meter.
(2) The NTC thermistor is collected through the analog-to-digital converter, the temperature is converted, the influence on ultrasonic wave propagation at different temperatures is corrected, and meanwhile, the error of the whole flow interval is further corrected, so that the error is closer to zero.
This step is carried out by placing the base watch equipped with the ultrasonic Transducer in a container of constant temperature, adjusting the temperature to 20 ℃, and connecting the two measurement terminals of the oscilloscope to the positive and negative electrodes of Transducer1 and Transducer2, respectively, as shown in fig. 2, in which the ultrasonic propagation time TOF is 180 us.
(3) Measuring the ultrasonic wave propagation TIME TOF of the ultrasonic wave in a static state through an oscilloscope, correcting an ADC _ SAMP _ TIME numerical value in a ussSwLib.h file, obtaining the optimal propagation TIME, ensuring that the measured TIME is more ready, and avoiding the phenomenon of peak staggering. The specific operation process of the step is as follows:
(3.1) acquiring the propagation time of the ultrasonic wave measured by the oscilloscope in a static state, and fitting to obtain a formula A: τ 0.5144 θ 2 16.002 θ +1148.7+ k, where τ is the delay time to enable stop pulses, θ is the fluid temperature, and k is the delay time correction factor;
(3.2) according to the acquired propagation TIME, correcting the value of ADC _ SAMP _ TIME in the 'ussSwlib.h' file for once, and shielding the TIME period from the transmission of the ultrasonic waves to the reception of the ultrasonic waves so as to reduce the interference before the echo does not reach the ultrasonic transducer, thereby finally obtaining the optimal propagation TIME.
And correcting the value of ADC _ SAMP _ TIME in a "ussSwLib.h" file, wherein the "ussSwLib.h" is a file in the MSP430FR6007 library function, and the ADC _ SAMP _ TIME is a variable in the file and represents the sampling start TIME.
(4) Calling a USSLibGUIADCC.c file in the MSP430FR6007 library function, exciting ultrasonic waves through an 'autostartLowPowerUltrasonicMeasure' function of the 'USSLibGUIADCC.c' file, and measuring low power consumption.
When low power consumption measurement is carried out, the amplitude is automatically amplified to a set amplitude value through a programmable gain amplifier, and the volume flow is obtained by calling a 'USS _ runAlgorithhmsFixedPoint' method.
In the measuring process, once the amplitude of an envelope curve acquired by the analog-to-digital converter is captured to be low, the programmable gain amplifier automatically amplifies the amplitude to a set amplitude value to obtain upstream and downstream time, and then a cross-correlation algorithm is carried out by calling a 'USS _ runAlgorithhms FixedPoint' method in an MSP430FR6007 library function to obtain volume flow so as to effectively avoid the problem of inaccurate measurement when the ultrasonic transducer is aged.
(5) And (3) carrying out interpolation calculation on the measured time difference and temperature through a fuzzy-interpolation algorithm to obtain a formula B: q is (theta/S +1712) × delta t/2048, wherein q is flow error compensation, theta is temperature, delta t is upstream and downstream time difference, and S is a segmented empirical coefficient and is obtained from time difference at different flow rates;
based on the resulting flow error compensation, the flow volume is integrated such that the error over the entire flow interval remains within a qualified range.
(6) And calling a USS _ calibresitesignalalgan function of the USSLibGUIAPc.c file at regular time to adjust the optimal gain reference, so that the optimal propagation time is obtained in the long-term measurement process, and the influence of poor water quality and transducer aging on measurement is reduced. The specific operation of this step is:
(6.1) calling the USS _ calibreS associated Gain regularly to obtain the gainRange;
(6.2) setting a gain value, judging whether the variation of the gainRange exceeds 5% of the set gain value last time, if so, not performing calibration, and if not, performing calibration once per hour, so that the optimal propagation time is obtained in the long-term measurement process.
In conclusion, the ultrasonic water meter measurement compensation method based on the MSP430 single chip microcomputer can accurately measure errors, compensate ultrasonic measurement time, make up the influence of fluid temperature, transducer aging and water quality difference on ultrasonic measurement, and avoid peak collection error.
The principles and embodiments of the present invention have been described in detail using specific examples, which are provided only to aid in understanding the core technical content of the present invention. Based on the above embodiments of the present invention, those skilled in the art should make any improvements and modifications to the present invention without departing from the principle of the present invention, and therefore, the present invention should fall into the protection scope of the present invention.
Claims (7)
1. An ultrasonic water meter measurement compensation method based on an MSP430 single chip microcomputer is characterized in that the operation steps for realizing compensation comprise:
(1) adjusting the programmable pulse generator and the physical interface PHY with low impedance output driver to match the length of the pulse excitation according to the channel length of the measurement location to minimize zero flow drift;
(2) acquiring an NTC thermistor through an analog-to-digital converter, and converting the temperature to correct the influence on ultrasonic wave transmission at different temperatures;
(3) measuring the propagation TIME of the ultrasonic wave in a static state by using an oscilloscope, and correcting an ADC _ SAMP _ TIME numerical value in a ussSwlib.h file to obtain the optimal propagation TIME;
(4) when low power consumption measurement is carried out, the amplitude is automatically amplified to a set amplitude value through a programmable gain amplifier, and the volume flow is obtained by calling a 'USS _ RunAlgorithmsFixedPoint' method;
(5) and carrying out interpolation calculation on the measured time difference and the measured temperature through a fuzzy-interpolation algorithm, and obtaining an empirical formula B according to the result of the interpolation calculation: q = (theta/S +1712) × delta t/2048, wherein q is flow error compensation, theta is temperature, delta t is upstream and downstream time difference, and S is a segmented empirical coefficient and is obtained from time difference at different flow rates; then, based on the obtained flow error compensation, the flow volume is integrated, so that the error of the whole flow interval is kept in a qualified range;
(6) and calling a USS _ calibresiteSgnalGain function of the USSLibGUIAppc.c file at regular time to adjust the optimal gain reference so as to obtain the optimal propagation time in the long-term measurement process.
2. The MSP430 single chip microcomputer-based ultrasonic water meter measurement compensation method of claim 1, wherein the step (3) is performed by performing the following operations to obtain the optimal propagation time:
(3.1) acquiring the propagation time of the ultrasonic wave measured by the oscilloscope in a static state, and fitting to obtain a formula A: τ = 0.5144 θ 2 16.002 θ +1148.7+ k, where τ is the delay time to enable stop pulses, θ is the fluid temperature, and kA delay time correction factor;
(3.2) according to the acquired propagation TIME, correcting an ADC _ SAMP _ TIME value in a 'ussSwLib.h' file, and shielding the TIME period from the transmission of ultrasonic waves to the reception of the ultrasonic waves so as to reduce the interference before the echo reaches the ultrasonic transducer and finally obtain the optimal propagation TIME.
3. The MSP430 single-chip microcomputer-based ultrasonic water meter measurement compensation method as claimed in claim 2, wherein the ADC _ SAMP _ TIME value in the ussSwLib.h file is corrected once.
4. The MSP430 single chip microcomputer based ultrasonic water meter measurement compensation method of claim 2, wherein the "ussSwLib. h" is a file in the MSP430FR6007 library function, and the ADC _ SAMP _ TIME is a variable in the file, which represents the sampling turn-on TIME.
5. The MSP430 single-chip microcomputer-based ultrasonic water meter measurement compensation method of claim 2, wherein in the step (4), the USSLibGUIADCC.c file in the MSP430FR6007 library function is called, ultrasonic waves are excited through the USSLibGUIADCC.c file 'autostartLowPowerUltrasonicomeasurement' function, and low power consumption measurement is performed.
6. The MSP430 singlechip-based ultrasonic water meter measurement compensation method of claim 5, wherein in the measurement process, once the amplitude of the envelope acquired by the analog-to-digital converter is captured to be low, the programmable gain amplifier automatically amplifies the amplitude to a set amplitude value to obtain the upstream and downstream time, and then the cross-correlation algorithm is performed by calling the "USS _ RunAlgorithhms FixedPoint" method in the MSP430FR6007 library function to obtain the volume flow.
7. The MSP430 single chip microcomputer-based ultrasonic water meter measurement compensation method of claim 6, wherein the step (6) is performed by the following steps of obtaining the optimal propagation time during the long-term measurement:
(6.1) calling the USS _ calibreS associated Gain regularly to obtain the gainRange;
(6.2) setting a gain value, judging whether the variation of the gainRange exceeds 5% of the set gain value last time, if so, not performing calibration, and if not, performing calibration once per hour, so that the optimal propagation time is obtained in the long-term measurement process.
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