CN113418572A - Signal authenticity detection system and method of flowmeter and gas metering equipment - Google Patents
Signal authenticity detection system and method of flowmeter and gas metering equipment 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
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
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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
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Abstract
The invention discloses a signal authenticity detection system and method of a flowmeter and gas metering equipment, and the system mainly comprises the following steps: the ultrasonic transducer comprises two probes, and the probes are fixed on the flow channel and used for detecting the gas flow in the flow channel; the probe driving module is used for switching probe modes, and the probe modes comprise a probe transmitting mode and a probe receiving mode; the signal conditioning module is used for judging whether the echo signal received by the probe is a real signal; and conditioning the echo signal determined as a real signal to reach a threshold value. By judging whether the echo signal is a real signal or not, the real echo signal can be determined efficiently, and therefore the measurement accuracy of the flowmeter is improved.
Description
Technical Field
The invention relates to the technical field of flow measurement, in particular to a signal authenticity detection system and method of a flowmeter and gas metering equipment.
Background
The gas ultrasonic flowmeter (also called as gas ultrasonic flowmeter) has the advantages of high measurement precision, no pressure loss, large range ratio and the like, and is widely applied to the field of natural gas flow measurement. Ultrasonic gas flow meters offer unique advantages over other gas flow meters (e.g., orifice plates, turbine flow meters, etc.) in terms of metering accuracy, reliability, pressure loss, maintenance costs, and manufacturing costs. Among them, the gas ultrasonic flow meter with the difference of propagation time is most widely used. The gas ultrasonic flowmeter consists of two parts, namely a transducer part and a sensor part, wherein the transducer part comprises 1 or more pairs of ultrasonic transducers, a pressure sensor and a temperature sensor; the second is a transmitter which comprises a driving signal generating and conditioning part, an echo signal conditioning and digital processing part and a human-computer interaction part. The key point of the development of the gas ultrasonic flowmeter is to select a proper ultrasonic driving signal, overcome the influence of a noise signal mixed in an echo signal and respectively obtain the propagation time of the ultrasonic in a forward flow state and a reverse flow state according to a certain stable characteristic point of the echo signal. It is particularly important to determine whether the echo signal is a stable feature point.
Disclosure of Invention
Objects of the invention
In view of the above problems, an object of the present invention is to provide a signal authenticity detection system and method for a flow meter, and a gas metering device, so as to accurately and effectively detect whether an echo signal is an authentic signal, thereby improving the measurement accuracy of the flow meter.
(II) technical scheme
As a first aspect of the present invention, the present invention discloses a signal authenticity detection system of a flow meter, comprising:
the ultrasonic transducers comprise two probes, and the probes are fixed on the flow channel and used for detecting the gas flow in the flow channel;
the probe driving module is used for switching probe modes, and the probe modes comprise a probe transmitting mode and a probe receiving mode;
the signal conditioning module is used for judging whether the echo signal received by the probe is a real signal or not; and conditioning the echo signal determined as a real signal to reach a threshold value.
In one possible embodiment, the signal conditioning module comprises:
the signal conditioning unit is used for conditioning the echo signal;
the amplitude detection unit is used for judging whether the received echo signal is a real signal;
and the automatic gain control unit is used for carrying out gain adjustment on the real echo signal so as to enable the real echo signal to reach a set state.
In one possible embodiment, the signal conditioning unit performs impedance matching, band-pass filtering and amplification on the echo signal.
In a possible embodiment, the amplitude detection unit compares the amplitude threshold and the reaching time of the echo signal with the triggering threshold and the set time, and if the amplitude threshold and the reaching time of the echo signal match the triggering threshold and the set time, the echo signal is a real signal.
In one possible embodiment, the signal conditioning unit conditions the received echo signal of the oscillating wave.
In one possible embodiment, the probe driving module includes:
the pulse transmitting unit is used for transmitting a driving signal to the probe;
an amplifying unit for amplifying the driving signal;
and the mode switching unit is used for switching the probe module.
In one possible embodiment, the pulse transmitting unit transmits the driving signal to the probe as a square wave pulse signal.
In a possible implementation mode, the two probes of the ultrasonic transducer are respectively positioned on the opposite surfaces of the emission surface on the flow channel, and the two probes are arranged obliquely relative to each other, and the lower ends of the two probes face the center position of the emission surface.
In a possible embodiment, one of the probes emits ultrasonic waves, which are transmitted by the transmitting surface and then received by the other probe, and the transmitting angle of the ultrasonic waves on the transmitting surface is 90 °.
In a possible embodiment, two pairs of ultrasonic transducers form ultrasonic paths which are mutually staggered, and the projection included angle of the two sets of ultrasonic paths on the cross section of the flow channel body is 180 °.
In a possible embodiment, a square inner cavity is arranged in the flow channel, and a gas inlet and a gas outlet are respectively arranged at two ends of the inner cavity.
As a second aspect of the present invention, the present invention also discloses a signal authenticity detection method for a flow meter, including: sending an ultrasonic signal to the probe;
the other probe receives an echo signal;
judging whether the echo signal is a real signal;
and conditioning the echo signal of the real signal to enable the echo signal to reach a threshold value.
In a possible embodiment, the conditioning the echo signal of the real signal specifically includes:
and performing impedance matching, band-pass filtering and amplification on the echo signal.
In a possible embodiment, the conditioning of the echo signal that is a true signal specifically includes:
and conditioning the received echo signal of the oscillation wave.
In a possible implementation manner, the determining whether the echo signal is a real signal specifically includes:
comparing the amplitude threshold value and the reaching time of the echo signal with the triggering threshold value and the set time, and if the amplitude threshold value and the reaching time of the echo signal are in accordance with the triggering threshold value and the set time, the echo signal is a real signal.
In a possible embodiment, the sending an ultrasonic signal to the probe further includes:
transmitting a drive signal to the probe;
amplifying the driving signal;
and switching the probe modules.
In one possible embodiment, the emission driving signal to the probe is a square wave pulse signal.
In a possible implementation mode, the ultrasonic transducer comprises two probes, the two probes are respectively positioned on the opposite surfaces of the emission surface on the flow channel, the two probes are oppositely arranged in an inclined mode, and the lower ends of the two probes face the center position of the emission surface.
In a possible embodiment, one of the probes emits ultrasonic waves, which are transmitted by the transmitting surface and then received by the other probe, and the transmitting angle of the ultrasonic waves on the transmitting surface is 90 °.
In a possible embodiment, two pairs of ultrasonic transducers form ultrasonic paths which are mutually staggered, and the projection included angle of the two sets of ultrasonic paths on the cross section of the flow channel body is 180 °.
In a possible embodiment, a square inner cavity is arranged in the flow channel, and a gas inlet and a gas outlet are respectively arranged at two ends of the inner cavity.
As a third aspect of the present invention, the present invention also discloses a gas metering device comprising: the signal authenticity detection system comprises a shell and the flowmeter of any technical scheme;
the shell is provided with an air inlet and an air outlet, and the flow channel is arranged in the shell and fixedly communicated with the air outlet.
In one possible embodiment, the signal authenticity detection system comprises:
the ultrasonic transducers comprise two probes, and the probes are fixed on the flow channel and used for detecting the gas flow in the flow channel;
the probe driving module is used for switching probe modes, and the probe modes comprise a probe transmitting mode and a probe receiving mode;
the signal conditioning module is used for judging whether the echo signal received by the probe is a real signal or not; and conditioning the echo signal determined as a real signal to reach a threshold value.
In one possible embodiment, the signal conditioning module comprises:
the signal conditioning unit is used for conditioning the echo signal;
the amplitude detection unit is used for judging whether the received echo signal is a real signal;
and the automatic gain control unit is used for carrying out gain adjustment on the real echo signal so as to enable the real echo signal to reach a set state.
In one possible embodiment, the signal conditioning unit performs impedance matching, band-pass filtering and amplification on the echo signal.
In a possible embodiment, the amplitude detection unit compares the amplitude threshold and the reaching time of the echo signal with the triggering threshold and the set time, and if the amplitude threshold and the reaching time of the echo signal match the triggering threshold and the set time, the echo signal is a real signal.
In one possible embodiment, the signal conditioning unit conditions the received echo signal of the oscillating wave.
In one possible embodiment, the probe driving module includes:
the pulse transmitting unit is used for transmitting a driving signal to the probe;
an amplifying unit for amplifying the driving signal;
and the mode switching unit is used for switching the probe module.
In one possible embodiment, the pulse transmitting unit transmits the driving signal to the probe as a square wave pulse signal.
In one possible embodiment, the flow meter comprises: the ultrasonic transducer comprises two probes, the two probes are respectively positioned on the opposite surfaces of the transmitting surface on the flow channel, the two probes are arranged in an inclined mode, and the lower ends of the two probes face the center of the transmitting surface.
In a possible embodiment, one of the probes emits ultrasonic waves, which are reflected by the emitting surface and then enter the other probe for reception, and the emitting angle of the ultrasonic waves on the emitting surface is 90 °.
In a possible embodiment, two pairs of ultrasonic transducers form ultrasonic paths which are mutually staggered, and the projection included angle of the two sets of ultrasonic paths on the cross section of the flow channel body is 180 °.
In a possible embodiment, a square inner cavity is arranged in the flow channel, and a gas inlet and a gas outlet are respectively arranged at two ends of the inner cavity.
In a possible embodiment, the flow meter is connected to the air outlet through a connecting pipe, so that the included angle of the flow meter with the horizontal direction is 5-65 degrees.
(III) advantageous effects
The invention discloses a signal authenticity detection system and method of a flowmeter and gas metering equipment. The real signals can be determined efficiently, and therefore the measurement accuracy of the flowmeter is improved.
Drawings
The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining and illustrating the present invention and should not be construed as limiting the scope of the present invention.
FIG. 1 is a schematic diagram of a signal integrity detection system for a flow meter according to the present disclosure;
FIG. 2 is a schematic diagram of a transmitting driving signal and echo signal processing structure disclosed in the present invention;
FIG. 3 is a flow chart of a signal authenticity detection method of a flow meter according to the present disclosure;
FIG. 4 is a flow chart of the present disclosure for transmitting an ultrasound signal to a probe;
fig. 5 is a schematic structural diagram of a gas metering device disclosed by the invention.
Reference numerals:
100. an ultrasonic transducer; 110. a probe; 120. a flow channel; 200. a probe driving module; 210. a pulse transmitting unit; 220. an amplifying unit; 230. a mode switching unit; 300. a signal conditioning module; 310. a signal conditioning unit; 320. an amplitude detection unit; 330. an automatic gain control unit; 800. a housing.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.
It should be noted that: in the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are some embodiments of the present invention, not all embodiments, and features in embodiments and embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
A first embodiment of a signal authenticity detection system for a flow meter according to the present disclosure is described in detail below with reference to fig. 1-2. The embodiment is mainly applied to flow measurement, and can effectively detect whether the echo signal is a real signal or not, so that the measurement accuracy of the flowmeter is improved.
As shown in fig. 1-2, the present embodiment mainly includes at least one pair of ultrasonic transducers 100, a probe driving module 200, and a signal conditioning module 300.
Wherein, a pair of ultrasonic transducers 100 includes two probes 110, the probes 110 are fixed on the flow channel 120 for detecting the gas flow in the flow channel 120, the probe driving module 200 is used to switch the modes of the probes 110, the modes of the probes 110 include a transmitting mode of the probes 110 and a receiving mode of the probes 110, the probes 110 can both receive and transmit signals, and a complete measurement process is to transmit ultrasonic waves through one probe 110, the other probe 110 receives the transmitted ultrasonic waves, i.e. echo signals, the ultrasonic waves transmitted by one probe 110 are transmitted to the other probe 110 after passing through the reflecting surface, and the time required for the probe 110 to receive the ultrasonic waves is a propagation time of the ultrasonic waves, when the ultrasonic waves propagate along the gas in the flow channel 120, the time required is defined as the downstream propagation time of the ultrasonic waves, when the ultrasonic waves propagate against the gas in the flow channel 120, the time required is defined as the ultrasonic counter-current propagation time.
And calculating the flow rate of the fluid by using the time difference through the time difference between the forward flow propagation time and the backward flow propagation time of the ultrasonic wave, thereby calculating the flow rate of the fluid. Therefore, to obtain a precise fluid flow, a precise time difference between the forward and backward travel times of the ultrasonic wave is required, and the precision of the time difference is determined by the accuracy of the received echo signal.
The signal conditioning module 300 is configured to determine whether the echo signal received by the probe 110 is a real signal, so as to improve the measurement accuracy of the flow meter, and perform gain adjustment on the echo signal when the echo signal is determined to be the real signal, so that the echo signal is adjusted to a set state.
In one embodiment, the signal conditioning module 300 includes: the signal conditioning unit 310 is configured to condition an echo signal, the amplitude detection unit 320 is configured to determine whether the received echo signal is a real signal, and the automatic gain control unit 330 is configured to perform gain adjustment on the real echo signal to enable the real echo signal to reach a set state.
In one embodiment, the signal conditioning unit 310 impedance matches, band pass filters, and amplifies the echo signal.
In one embodiment, the amplitude detection unit 320 compares the amplitude threshold and the reaching time of the echo signal with the threshold and the set time of the trigger, and if the amplitude threshold and the reaching time of the echo signal match with the threshold and the set time of the trigger, the echo signal is a real signal.
In one embodiment, the signal conditioning unit 310 conditions the received oscillatory wave echo signal.
In the implementation of the present application, one of the probes 110 receives an echo signal in the form of an oscillating wave, because the energy of the oscillating wave signal is weak, the signal conditioning unit 310 conditions the echo signal, mainly performs operations such as impedance matching, band-pass filtering, and amplification on the echo signal, and then performs amplitude detection on the amplified echo signal by using the amplitude detection unit 320, to specifically detect the size of the echo signal and whether the echo signal is in place, compares the amplitude threshold and the arrival time of the echo signal with the set amplitude threshold and the set arrival time threshold, if the amplitude threshold and the arrival time of the echo signal trigger the threshold, the echo signal is a real signal, and if the threshold is not triggered, the echo signal is another signal.
After the echo signal is determined to be a real signal, if the echo signal does not reach a preset magnitude, an automatic gain control unit 330(AGC) is used to perform gain adjustment, so as to adjust the waveform signal of the echo signal to a set state.
Furthermore, a circuit formed by an operational amplifier and a resistance-capacitance is adopted to carry out impedance matching on the echo signal.
In one embodiment, the probe drive module 200 includes: a pulse transmitting unit 210, an amplifying unit 220 and a mode switching unit 230, wherein the pulse transmitting unit 210 is used for transmitting a driving signal to the probe 110; the amplifying unit 220 is used for amplifying the driving signal; the mode switching unit 230 is used for switching the modules of the probe 110.
In one embodiment, the pulse transmitting unit 210 transmits the driving signal to the probe 110 as a square wave pulse signal.
In the embodiment of the present application, a square wave pulse is transmitted to the probe 110 through the pulse transmitting unit 210, the probe 110 transmits the pulse, since the pulse energy is small, the square wave energy is amplified by the amplifying unit 220, the mode switching unit 230 switches the probe 110 to a currently required module as required, for example, the currently required module is ultrasonic wave forward flow propagation, the downstream probe 110 is in a transmitting mode, and the upstream probe 110 is in a receiving mode.
In one embodiment, the two probes 110 of the ultrasonic transducer 100 are respectively located on the flow channel 120 opposite to the emitting surface, and the two probes 110 are disposed obliquely with their lower ends facing the center of the emitting surface.
In one embodiment, the ultrasonic waves emitted from one probe 110 are reflected by the emitting surface and then received by the other probe 110, and the emitting angle of the ultrasonic waves on the emitting surface is 90 °.
In one embodiment, the two pairs of ultrasonic transducers 100, the ultrasonic paths formed by the two pairs of ultrasonic transducers 100 are staggered with each other, and the projection angle of the two sets of ultrasonic paths on the cross section of the flow channel 120 body is 180 °.
In one embodiment, the flow channel 120 has a square inner cavity, and the two ends of the inner cavity are respectively provided with a gas inlet and a gas outlet.
In this embodiment, a square inner cavity is disposed in the flow channel 120, so that the gas in the flow channel 120 forms a laminar flow, which is convenient for measurement, a pair of ultrasonic transducers 100 is disposed on two side walls of the flow channel 120, two probes 110 of the ultrasonic transducers 100 are respectively located on opposite surfaces of an emitting surface of the flow channel 120, the two probes 110 are disposed in an inclined manner, lower ends of the two probes face the center of the emitting surface, the ultrasonic wave emitted by one probe 110 is reflected by the emitting surface and then enters the other probe 110 to be received, and an emission included angle of the ultrasonic wave on the emitting surface is 90 °. The probes 110 can receive ultrasonic waves and transmit ultrasonic waves, when one probe 110 serves as a transmitting end to transmit ultrasonic waves, the other probe 110 serves as a receiving end to receive ultrasonic waves, and the two probes 110 alternately serve as the transmitting end and the receiving end. The pulse emitting unit 210 emits a square wave pulse to the probe 110, the probe 110 emits the pulse, an ultrasonic signal is transmitted to a sensor of another probe 110 through a medium, such as air or solid gas, after the echo signal is received by the probe 110, the echo signal is identified and conditioned by the signal conditioning module 300, the conditioned signal is converted into a digital signal, corresponding time difference calculation is performed, and finally, the flow rate of the fluid in the flow channel 120 can be obtained through calculation.
Referring to fig. 3-4, a first embodiment of a signal authenticity detection method for a flow meter is disclosed, and the present embodiment is a signal authenticity detection system suitable for implementing the flow meter.
As shown in fig. 3, the method disclosed in this embodiment includes the following steps:
In one embodiment, in step 700, conditioning the echo signal of the real signal includes:
and performing impedance matching, band-pass filtering and amplification on the echo signal.
In one embodiment, conditioning an echo signal that is a true signal specifically includes:
and conditioning the received echo signal of the oscillation wave.
In one embodiment, in step 600, determining whether the echo signal is a real signal specifically includes:
by comparing the amplitude threshold value and the reaching time of the echo signal with the triggering threshold value and the set time, if the amplitude threshold value and the reaching time of the echo signal are in accordance with the triggering threshold value and the set time, the echo signal is a real signal.
In one embodiment, as shown in fig. 4, in step 400, transmitting an ultrasound signal to the probe further comprises the steps of:
and 430, switching the probe modules.
In one embodiment, the drive signal is a square wave pulse signal transmitted to the probe.
In this embodiment, the driving signal transmitted to the probe is a square wave pulse signal, and the energy of the square wave pulse signal is amplified, so that the mode of the probe is switched to the transmitting end, the probe transmits a pulse, that is, the probe transmits an ultrasonic wave, the ultrasonic wave signal passes through a medium, such as air or solid gas, in this embodiment, the solid gas refers to weather, and is transmitted to another probe as a sensor of a receiving end, the received echo signal is in the form of an oscillating wave, and because the energy of the oscillating wave signal is weak, the echo signal is conditioned, mainly, impedance matching, band-pass filtering and amplification are performed on the echo signal, the amplified echo signal is judged to be a true signal, if the echo signal is a true signal, the size of the echo signal is detected, and if the echo signal is not a desired signal, gain adjustment is performed, and the waveform signal of the ultrasonic wave is adjusted to a set state.
In one embodiment, the ultrasonic transducer comprises two probes, the two probes are respectively positioned on the opposite surfaces of the transmitting surface on the flow channel, the two probes are arranged in an opposite inclined mode, and the lower ends of the two probes face the central position of the transmitting surface.
In one embodiment, the ultrasonic wave emitted by one probe is reflected by the emitting surface and then enters the other probe for receiving, and the emitting angle of the ultrasonic wave on the emitting surface is 90 degrees.
In one embodiment, the two pairs of ultrasonic transducers form ultrasonic paths which are staggered with each other, and the projection included angle of the two sets of ultrasonic paths on the cross section of the flow channel body is 180 °.
In one embodiment, a square inner cavity is arranged in the flow channel, and a gas inlet and a gas outlet are respectively arranged at two ends of the inner cavity.
Referring to fig. 5, a first embodiment of a gas metering device disclosed in this embodiment is described in detail below, and a signal authenticity detection system mainly including a housing 800 and a flow meter is disclosed in this embodiment. The signal authenticity detection system of the flow meter in this embodiment is identical in structure and function to the signal authenticity detection system of the flow meter shown in fig. 1-2 described above.
The housing 800 is provided with an air inlet and an air outlet, and the flow channel 120 is disposed in the housing 800 and fixedly communicated with the air outlet.
In one embodiment, a signal authenticity detection system comprises:
at least one pair of ultrasonic transducers 100, wherein the ultrasonic transducers 100 comprise two probes 110, and the probes 110 are fixed on the flow channel 120 and used for detecting the gas flow in the flow channel 120;
the probe driving module 200, the probe driving module 200 is used for switching the modes of the probe 110, and the modes of the probe 110 include a transmitting mode of the probe 110 and a receiving mode of the probe 110;
the signal conditioning module 300, the signal conditioning module 300 is configured to determine whether the echo signal received by the probe 110 is a real signal; and conditioning the echo signal determined as a real signal to reach a threshold value.
In one embodiment, the signal conditioning module 300 includes:
the signal conditioning unit 310, the signal conditioning unit 310 is used for conditioning the echo signal;
the amplitude detection unit 320, the amplitude detection unit 320 is used for judging whether the received echo signal is a real signal;
the automatic gain control unit 330, the automatic gain control unit 330 is configured to perform gain adjustment on the real echo signal to make it reach a set state.
In one embodiment, the signal conditioning unit 310 impedance matches, band pass filters, and amplifies the echo signal.
In one embodiment, the amplitude detection unit 320 compares the amplitude threshold and the reaching time of the echo signal with the threshold and the set time of the trigger, and if the amplitude threshold and the reaching time of the echo signal match with the threshold and the set time of the trigger, the echo signal is a real signal.
In one embodiment, the signal conditioning unit 310 conditions the received oscillatory wave echo signal.
In one embodiment, the probe drive module 200 includes:
a pulse transmitting unit 210, the pulse transmitting unit 210 being configured to transmit a driving signal to the probe 110;
an amplifying unit 220, the amplifying unit 220 amplifying the driving signal;
and the mode switching unit 230, wherein the mode switching unit 230 is used for switching the probe 110 module.
In one embodiment, the pulse transmitting unit 210 transmits the driving signal to the probe 110 as a square wave pulse signal.
In one embodiment, a flow meter comprises: ultrasonic transducer 100, ultrasonic transducer 100 include two probes 110, and two probes 110 are located the relative face of transmitting surface on runner 120 respectively, and two probes 110 relative slope settings, and both low ends all face transmitting surface central point and put.
In one embodiment, the ultrasonic waves emitted from one probe 110 are reflected by the emitting surface and then received by the other probe 110, and the emitting angle of the ultrasonic waves on the emitting surface is 90 °.
In one embodiment, the ultrasonic paths formed by the two pairs of ultrasonic transducers 100 are staggered, and the projection angles of the two sets of ultrasonic paths on the cross section of the body of the flow channel 120 are 180 °.
In one embodiment, the flow channel 120 has a square inner cavity, and the two ends of the inner cavity are respectively provided with a gas inlet and a gas outlet.
In one embodiment, the flow meter is connected to the outlet port by a connecting tube such that the flow meter is angled from 5 to 65 degrees from horizontal.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A signal authenticity detection system for a flow meter, comprising:
the ultrasonic transducers comprise two probes, and the probes are fixed on the flow channel and used for detecting the gas flow in the flow channel;
the probe driving module is used for switching probe modes, and the probe modes comprise a probe transmitting mode and a probe receiving mode;
the signal conditioning module is used for judging whether the echo signal received by the probe is a real signal or not; and conditioning the echo signal determined as a real signal to reach a threshold value.
2. The signal authenticity detection system according to claim 1, wherein the signal conditioning module comprises:
the signal conditioning unit is used for conditioning the echo signal;
the amplitude detection unit is used for judging whether the received echo signal is a real signal;
and the automatic gain control unit is used for carrying out gain adjustment on the real echo signal so as to enable the real echo signal to reach a set state.
3. The signal authenticity detection system for a flow meter according to claim 2, comprising: and the signal conditioning unit performs impedance matching, band-pass filtering and amplification on the echo signal.
4. The signal authenticity detection system for a flow meter according to claim 2, comprising: the amplitude detection unit compares the amplitude threshold value and the reaching time of the echo signal with the triggering threshold value and the set time, and if the amplitude threshold value and the reaching time of the echo signal are in accordance with the triggering threshold value and the set time, the echo signal is a real signal.
5. A method for detecting signal authenticity of a flow meter, comprising the steps of:
sending an ultrasonic signal to the probe;
the other probe receives an echo signal;
judging whether the echo signal is a real signal;
and conditioning the echo signal of the real signal to enable the echo signal to reach a threshold value.
6. The method for detecting the signal authenticity of the flow meter according to claim 5, wherein the conditioning of the echo signal of the true signal specifically comprises:
and performing impedance matching, band-pass filtering and amplification on the echo signal.
7. The method for detecting the signal authenticity of the flow meter according to claim 6, wherein the conditioning of the echo signal that is a true signal specifically comprises:
and conditioning the received echo signal of the oscillation wave.
8. A gas metering device, comprising: a signal authenticity detection system for the housing and the flow meter;
the shell is provided with an air inlet and an air outlet, and the flow channel is arranged in the shell and fixedly communicated with the air outlet.
9. Gas metering apparatus according to claim 8, characterized in that the signal authenticity detection system comprises:
the ultrasonic transducers comprise two probes, and the probes are fixed on the flow channel and used for detecting the gas flow in the flow channel;
the probe driving module is used for switching probe modes, and the probe modes comprise a probe transmitting mode and a probe receiving mode;
the signal conditioning module is used for judging whether the echo signal received by the probe is a real signal or not; and conditioning the echo signal determined as a real signal to reach a threshold value.
10. The gas metering device of claim 9, wherein the signal conditioning module comprises:
the signal conditioning unit is used for conditioning the echo signal;
the amplitude detection unit is used for judging whether the received echo signal is a real signal;
and the automatic gain control unit is used for carrying out gain adjustment on the real echo signal so as to enable the real echo signal to reach a set state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110677310.7A CN113418572A (en) | 2021-06-18 | 2021-06-18 | Signal authenticity detection system and method of flowmeter and gas metering equipment |
Applications Claiming Priority (1)
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| CN202110677310.7A CN113418572A (en) | 2021-06-18 | 2021-06-18 | Signal authenticity detection system and method of flowmeter and gas metering equipment |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030028334A1 (en) * | 2001-06-26 | 2003-02-06 | Tarek Ghaoud | Evaluating a vortex flow-meter signal |
| CN107084763A (en) * | 2017-04-27 | 2017-08-22 | 上海大学 | Transit-time ultrasonic flow meter signal processing system |
| CN107727176A (en) * | 2017-10-19 | 2018-02-23 | 西安安森智能仪器股份有限公司 | A kind of ultrasonic gas flowmeter and its flow-measuring method |
| CN108387278A (en) * | 2018-02-09 | 2018-08-10 | 杭州山科智能科技股份有限公司 | A kind of window time automatic adjusting method of ultrasound echo signal |
| CN109752056A (en) * | 2018-12-29 | 2019-05-14 | 杭州先锋电子技术股份有限公司 | A kind of flow passage structure and ultrasonoscope scale of ultrasonic gas metering device |
| CN110906995A (en) * | 2019-12-30 | 2020-03-24 | 杭州先锋电子技术股份有限公司 | Ultrasonic gas meter |
| CN213209159U (en) * | 2020-11-11 | 2021-05-14 | 浙江正泰燃气装备有限公司 | Ultrasonic wave metering device |
-
2021
- 2021-06-18 CN CN202110677310.7A patent/CN113418572A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030028334A1 (en) * | 2001-06-26 | 2003-02-06 | Tarek Ghaoud | Evaluating a vortex flow-meter signal |
| CN107084763A (en) * | 2017-04-27 | 2017-08-22 | 上海大学 | Transit-time ultrasonic flow meter signal processing system |
| CN107727176A (en) * | 2017-10-19 | 2018-02-23 | 西安安森智能仪器股份有限公司 | A kind of ultrasonic gas flowmeter and its flow-measuring method |
| CN108387278A (en) * | 2018-02-09 | 2018-08-10 | 杭州山科智能科技股份有限公司 | A kind of window time automatic adjusting method of ultrasound echo signal |
| CN109752056A (en) * | 2018-12-29 | 2019-05-14 | 杭州先锋电子技术股份有限公司 | A kind of flow passage structure and ultrasonoscope scale of ultrasonic gas metering device |
| CN110906995A (en) * | 2019-12-30 | 2020-03-24 | 杭州先锋电子技术股份有限公司 | Ultrasonic gas meter |
| CN213209159U (en) * | 2020-11-11 | 2021-05-14 | 浙江正泰燃气装备有限公司 | Ultrasonic wave metering device |
Non-Patent Citations (1)
| Title |
|---|
| 陈洁等: "基于双阈值比较法超声波流量计信号处理", 《电子测量与仪器学报》, vol. 27, no. 11, pages 1024 * |
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