CN116953073A - Gas measurement system and method based on ultrasonic transducer - Google Patents

Gas measurement system and method based on ultrasonic transducer Download PDF

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Publication number
CN116953073A
CN116953073A CN202310946962.5A CN202310946962A CN116953073A CN 116953073 A CN116953073 A CN 116953073A CN 202310946962 A CN202310946962 A CN 202310946962A CN 116953073 A CN116953073 A CN 116953073A
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gas
ultrasonic transducer
ultrasonic
sensor
data
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CN116953073B (en
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彭蒙
程燕龙
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Guangzhou Ancheng Electronic Technology Co ltd
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Guangzhou Ancheng Electronic Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
    • G01N29/341—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics
    • G01N29/343—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with time characteristics pulse waves, e.g. particular sequence of pulses, bursts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • G01N29/4418—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a model, e.g. best-fit, regression analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
    • G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
    • G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/021—Gases
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/02809—Concentration of a compound, e.g. measured by a surface mass change

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  • General Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The application relates to a gas measurement system and method based on ultrasonic transducer, it is a technical field of gas measurement, including remote command center and on-the-spot detection system, the remote command center includes monitor terminal and information center database, monitor terminal displays the gas measurement situation in real time, and can control the on-the-spot detection system in reverse; the on-site detection system comprises a collector, a sensor, an ultrasonic transducer and a controller, wherein the sensor comprises a temperature and humidity sensor and an oxygen sensor, and is connected with the collector; the collector receives and collects the environmental data collected by the sensor in real time and is in communication connection with the remote command center; the controller monitors and analyzes the gas data transmitted by the collector, and makes judgment and decision according to preset rules and logic. The problem of solving the concentration of the target gas into solving the phase difference of two ultrasonic signals is solved, and the problem that the ultrasonic signal front pulse wave is difficult to accurately detect due to improper selection of ultrasonic receiving points is avoided by detecting the phase.

Description

Gas measurement system and method based on ultrasonic transducer
Technical Field
The application belongs to the technical field of gas measurement, and particularly relates to a gas measurement system and method based on an ultrasonic transducer.
Background
In gas measurement, an ultrasonic transducer is usually installed as a sensor in a gas flow channel, and when the ultrasonic transducer emits an acoustic wave, the acoustic wave propagates in the gas, and after a certain distance, the acoustic wave is received by a receiver, and parameters such as a flow rate, a density and the like of the gas can be determined according to the propagation speed and the attenuation condition of the acoustic wave.
In practical applications of ultrasonic gas measurement, there are many factors causing gas measurement errors, and an extremely important factor is that distortion of ultrasonic waveforms can have a significant influence on detection of acoustic wave propagation speed, thereby causing degradation of ultrasonic phase measurement precision and accuracy.
Disclosure of Invention
The application provides a gas measurement system and a gas measurement method based on an ultrasonic transducer, which are used for solving the technical problems that in the background art, the ultrasonic wave waveform generates distortion, so that the detection of the propagation speed of the sound wave generates larger errors, and the precision and the accuracy of ultrasonic wave phase measurement are reduced.
The aim of the application can be achieved by the following technical scheme:
an ultrasonic transducer-based gas measurement system comprising a remote command center and a field detection system, wherein:
the remote command center comprises a monitoring terminal and an information center database, wherein the monitoring terminal displays the gas measurement condition in real time, and the on-site detection system is reversely controlled through the monitoring terminal;
the on-site detection system comprises a collector, a sensor, an ultrasonic transducer and a controller, wherein the sensor comprises a temperature and humidity sensor and an oxygen sensor, and is connected with the collector; the collector receives and collects the environmental data collected by the sensor in real time and is in communication connection with the remote command center;
the controller monitors and analyzes the gas data transmitted by the collector, and judges and makes a decision according to preset rules and logic.
Further, the collector comprises a plurality of sensor interfaces, a data processing unit and a communication module, wherein the sensor interfaces are RS485 and are used for receiving gas data collected by the sensor; the data processing unit receives the gas data and processes and analyzes the gas data; the communication module is used for transmitting the processed gas data to the controller.
Further, the data processing unit comprises a microprocessor, a computer chip, a memory and an algorithm module, wherein the microprocessor sends instructions and data to the computer chip through a bus, coordinates and controls each functional module in the computer chip, is connected with the algorithm module, and invokes and executes a specific algorithm through the transmission of the instructions and the data.
Further, the algorithm module comprises a two-channel differential phase detection model, wherein the two-channel differential phase detection model is used for detecting an estimated value of the phase difference of the airflow signals through differential operation by receiving the airflow signals of two channels.
Further, the field detection system further comprises a plurality of groups of same ultrasonic transducers, and input data of the two-channel differential phase detection model are obtained through the ultrasonic transducers.
The application also provides a gas measurement method based on the ultrasonic transducer, which is applied to the gas measurement system based on the ultrasonic transducer, and specifically comprises the following steps:
establishing a dual-channel differential phase detection model according to historical gas data;
acquiring temperature, humidity and oxygen concentration in a field environment through a sensor, measuring an airflow signal through an ultrasonic transducer, and detecting an estimated value of a phase difference of the airflow signal through differential operation;
determining a gas flow by calculating a phase difference estimate of the gas flow signal, calculating a flow value of the gas using the phase difference and the physical property parameter;
and carrying out data processing and analysis on the flow value of the gas, the temperature and humidity in the environment and the oxygen concentration through a collector to obtain an analysis result.
Further, measuring the airflow signal by the ultrasonic transducer specifically includes the steps of:
injecting air and gas to be detected into the detection cavity respectively by using a plurality of groups of same ultrasonic transducers;
the synchronous transmitting pulse driving signal drives the transducer, and the identical ultrasonic signals are received after passing through identical paths of the two chambers respectively;
and respectively measuring ultrasonic propagation parameters after passing through the detection cavity and the reference cavity, and calculating and inverting the concentration of the gas to be detected after difference.
Further, the expression formula of the phase difference is:
wherein c 0 Sound velocity for background gas; c t The propagation speed of ultrasonic waves in air and gas to be measured is obtained; f is the driving frequency of the ultrasonic transducer;
the relationship between the sound velocity and the phase difference in the gas to be measured is represented by the following relationship:
c t ＝g(θ)
the relationship between the ultrasound propagation speed and the gas concentration is represented by the following relationship:
n＝f(g(θ))。
further, substituting a calculation formula of the phase difference into the two-channel differential phase detection model to obtain the following calculation mode:
wherein n is the gas concentration; c (C) pα The constant pressure specific heat capacity of the gas to be measured; c (C) vα The specific heat capacity of the gas to be measured is determined; c (C) pβ The constant pressure specific heat capacity of the air; c (C) vβ The specific heat capacity is the fixed capacity of air; m is M α Is the relative molecular mass of the gas to be measured; m is M β Is the relative molecular mass of air; f is the driving frequency of the ultrasonic transducer; t is the propagation speed; gamma ray β Is air-borneIs a time difference of (c).
The application has the beneficial effects that:
1. according to the gas measurement system based on the ultrasonic transducer, on one hand, the on-site environment data are collected in real time through the on-site detection system, and in the process of collecting the on-site environment data, a collector in the on-site detection system adopts a differential idea, and a double-chamber detection method is utilized to respectively detect background gas and mixed gas. On the other hand, the design of the difference method detection can effectively eliminate errors caused by surrounding environment factors (such as temperature, pressure and the like), noise interference, electronic drift and the like on measurement.
2. The application discloses a gas measurement method based on an ultrasonic transducer, which is characterized in that a dual-channel differential phase detection model is established through historical gas data to calculate an estimated value of a phase difference, the gas flow is determined through the estimated value, and the temperature and humidity in the phase difference and the oxygen concentration in the environment are combined to calculate the flow value of the gas, so that the concentration of the gas is obtained through analysis.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall principle of a gas measurement system based on an ultrasonic transducer according to an embodiment of the present application;
FIG. 2 is a functional block diagram of a data processing unit in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of a dual-channel differential detection principle in an embodiment of the present application;
FIG. 4 is a flowchart showing the overall steps of an ultrasonic transducer-based gas measurement method according to an embodiment of the present application;
fig. 5 is a flowchart illustrating steps in step S2 according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1, the present embodiment provides a gas measurement system based on an ultrasonic transducer, including a remote command center and a field detection system, wherein:
the remote command center comprises a monitoring terminal and an information center database, wherein the monitoring terminal displays the gas measurement condition in real time, and the on-site detection system is reversely controlled through the monitoring terminal;
the on-site detection system comprises a collector, a sensor, an ultrasonic transducer and a controller, wherein the sensor comprises a temperature and humidity sensor and an oxygen sensor, and is connected with the collector; the collector receives and collects the environmental data collected by the sensor in real time and is in communication connection with the remote command center;
the controller monitors and analyzes the gas data transmitted by the collector, and judges and makes a decision according to preset rules and logic.
In the embodiment of the application, the system mainly comprises two parts, namely a remote command center and a field detection system, wherein the remote command center comprises a monitoring terminal and an information center database, and an operator can inquire data such as temperature and humidity, oxygen content, concentration of target measurement gas and the like transmitted from a field end in real time through the monitoring terminal in the remote command center so as to realize unified monitoring, control and management of each point on the field. The data transmitted back from the site end is stored in an information center database of a remote server, and operators can access and inquire the historical data at any time, so that whether the gas on the site is abnormal or not is judged. The historical data is also used for building a dual-channel differential phase detection model, and the content of the target gas is predicted through the dual-channel differential phase detection model.
Furthermore, in the embodiment of the application, the input data of the dual-channel differential phase detection model are the air flow signal data of the mixed gas and the background gas respectively detected by adopting a dual-chamber ultrasonic detection method, and the air flow signal data of the mixed gas and the air flow signal data of the background gas are respectively input into the dual-channel differential phase detection model, so that the dual-channel differential phase detection model has the advantages of high stability, simple structure, low cost, low concentration measurement and the like.
Further, the collector comprises a plurality of sensor interfaces, a data processing unit and a communication module, wherein the sensor interfaces are RS485 and are used for receiving gas data collected by the sensor; the data processing unit receives the gas data and processes and analyzes the gas data; the communication module is used for transmitting the processed gas data to the controller.
The on-site monitoring system mainly comprises a collector and a controller, wherein the collector is communicated with an upper computer monitoring center in real time through an RS485 bus and transmits the data frames, so that the reliability and stability of the transmission are ensured. The remote command center performs visual display on the received data, performs online analysis, recording and diagnosis on the processing result, stores the data monitored on site in a memory, and performs defect analysis on the follow-up of a public user.
Further, as shown in fig. 2, the data processing unit includes a microprocessor, a computer chip, a memory and an algorithm module, where the microprocessor sends instructions and data to the computer chip through a bus, coordinates and controls each functional module in the computer chip, and the microprocessor is connected with the algorithm module, and invokes and executes a specific algorithm through transmission of the instructions and the data.
In a data processing unit, a microprocessor, a computer chip, a memory, and an algorithm module are typically connected through a bus for information transmission and interaction.
Connection between microprocessor and computer chip:
the microprocessor is the core of the computer system and is responsible for controlling the operation of the computer and executing instructions. The computer chip is composed of a series of logic circuits for processing and coordinating the various functional modules of the system. The connections between the microprocessor and the computer chip are typically made through a system bus, a data bus, and an address bus. The microprocessor can send instructions and data through the bus to coordinate and control each functional module in the computer chip.
Connection between microprocessor and memory:
the memory is a device for storing data and program instructions, and includes Random Access Memory (RAM), read Only Memory (ROM), and the like. The microprocessor is connected to the memory through a bus, and can read data and instructions from the memory or write data to the memory. The microprocessor can specify the memory address to be read or written and transmit the corresponding data via the address bus and the data bus.
Connection between microprocessor and algorithm module:
an algorithm module is a software or hardware module for executing a specific algorithm that can process and analyze data to extract useful information and features. The microprocessor may interface with the algorithm modules and invoke and execute specific algorithms through the transmission of instructions and data. Typically, the microprocessor will transmit the data to be processed to the algorithm module and then receive the results processed by the algorithm module.
Further, the algorithm module comprises a two-channel differential phase detection model, wherein the two-channel differential phase detection model is used for detecting an estimated value of the phase difference of the airflow signals through differential operation by receiving the airflow signals of two channels.
The dual-channel differential phase detection model is a commonly used signal processing model for comparing the phase differences of two input signals. The model is typically used to measure and analyze phase information about the signal or waveform.
The basic principle of the two-channel differential phase detection model is to obtain the phase difference of an input signal and a reference signal by performing differential operation on the two signals. The model is typically composed of the following components:
input signal: the input signal is a signal or waveform to be measured and may be any form of signal, such as a voltage waveform, an optical signal, or an acoustic signal.
Reference signal: the reference signal is a signal or waveform used as a reference, and may be a fixed reference signal or a signal related to or synchronized with the input signal.
A differentiator: the differentiator is a key component of the dual-channel differential phase detection model and is used for carrying out differential operation on an input signal and a reference signal. The output of the differentiator is the difference of the two signals.
A phase detector: the phase detector is a component for analyzing the phase information output by the differentiator. It generally extracts phase difference information from differential signals by filtering, amplifying and processing them.
Display or output: the output of the phase detector may be displayed or output by a display or other means. Typically, the phase difference information is presented in numerical or graphical form for analysis and application by the user.
Advantages of the dual-channel differential phase detection model include high accuracy, stability and flexibility, and suitability for various signal processing and measurement applications. It is commonly used in the fields of real-time signal processing, communication systems, audio processing, image processing, etc., to obtain accurate phase information, and for applications such as timing adjustment, synchronization processing, etc.
Further, the field detection system further comprises a plurality of groups of same ultrasonic transducers, and input data of the two-channel differential phase detection model are obtained through the ultrasonic transducers.
The application also provides a gas measurement method based on the ultrasonic transducer, which is applied to the gas measurement system based on the ultrasonic transducer, as shown in fig. 4, and specifically comprises the following steps:
step S1, a dual-channel differential phase detection model is established according to historical gas data;
the phase measurement principle is to measure the phase difference between the ultrasonic wave receiving signal and a certain fixed signal to reflect the sound velocity variation, and the phase difference between the receiving signal and the fixed signal is changed and the variation is in a function relation with the gas concentration because the ultrasonic sound velocity is changed along with the gas concentration. The phase difference processing is carried out on the channel receiving signal and the reference channel receiving signal of the dual-channel system, the phase relation is needed to be detected, the receiving signal is continuous wave, the ringing effect and the receiving signal blanking area are avoided, compared with the time-of-flight measuring method, the phase difference measuring method has higher measuring precision, the measuring precision is not affected even if the output signal has larger attenuation because the signal intensity is not needed to be detected, and therefore the high-power excitation signal is not needed to be provided.
S2, acquiring temperature and humidity and oxygen concentration in a field environment through a sensor, measuring an airflow signal through an ultrasonic transducer, and detecting an estimated value of a phase difference of the airflow signal through differential operation;
further, as shown in fig. 5, in step S2, measuring the airflow signal by the ultrasonic transducer specifically includes the following steps:
step S210, injecting air and gas to be detected into the detection cavity by using a plurality of groups of same ultrasonic transducers;
step S220, synchronously transmitting pulse driving signals to drive the transducers, wherein the identical ultrasonic signals are received after passing through identical paths of the two chambers respectively;
and S230, respectively measuring ultrasonic propagation parameters after passing through the detection cavity and the reference cavity, and calculating and inverting the concentration of the gas to be detected after difference.
S3, determining the gas flow by calculating a phase difference estimated value of the gas flow signal, and calculating a flow value of the gas by using the phase difference and the physical parameters;
the principle of gas concentration measurement realized by the ultrasonic two-channel phase difference system is shown in figure 3. Ultrasonic waves are loaded at one end of two cavities close to the same path at the same time, two paths of receiving signals are taken at the other end of the cavities, one cavity is sealed with air, and the other cavity is filled with gas with concentration to be measured. When the ultrasonic signal passes through the two cavities, the sound wave transmission speeds are different due to different gas concentrations, and the two measuring ends receive unsynchronized sound wave signals, so that the fact that the received signals have phase differences is reflected. The phase difference is extracted by a phase detection technology and is sent to a subsequent signal processing unit for calculation processing to obtain the concentration of the gas to be detected. Acquiring the signal phase difference according to the two-channel structure can realize the system temperature compensation to a certain extent. The environment temperature can influence the sound velocity of ultrasonic waves, but the temperature change of the two channels is the same, the signal phase difference is affected by the temperature to a certain extent, and the temperature change is also the main reason for taking the two channels to measure the phase difference.
And S4, carrying out data processing and analysis on the flow value of the gas, the temperature and humidity in the environment and the oxygen concentration through a collector to obtain an analysis result.
Further, the expression formula of the phase difference is:
wherein c 0 Sound velocity for background gas; c t The propagation speed of ultrasonic waves in air and gas to be measured is obtained; f is the driving frequency of the ultrasonic transducer;
the relationship between the sound velocity and the phase difference in the gas to be measured is represented by the following relationship:
c t ＝g(θ)
the relationship between the ultrasound propagation speed and the gas concentration is represented by the following relationship:
n＝f(g(θ))。
further, substituting a calculation formula of the phase difference into the two-channel differential phase detection model to obtain the following calculation mode:
wherein n is the gas concentration; c (C) pα The constant pressure specific heat capacity of the gas to be measured; c (C) vα The specific heat capacity of the gas to be measured is determined; c (C) pβ The constant pressure specific heat capacity of the air; c (C) vβ The specific heat capacity is the fixed capacity of air; m is M α Is the relative molecular mass of the gas to be measured; m is M β Is the relative molecular mass of air; f is the driving frequency of the ultrasonic transducer; t is the propagation speed; gamma ray β Is the air-borne moveout.
The application also provides a relation model of gas concentration and ultrasonic wave phase difference, which comprises the following specific steps:
let the propagation speed of ultrasonic wave in background gas be C air The propagation speed in the gas to be measured in the measuring channel is C u The sound path of the measuring channel and the reference channel is L, and the time for transmitting sound waves in the gas to be measured of the measuring channel is t 1 The time taken in the air of the reference channel is t 2 The measured gas concentration u in the measuring channel is t 1 ＝L/C u ，t 2 ＝L/C air The propagation time difference of the ultrasonic wave in the two channels is deltat:
the relationship between the concentration u of the gas to be measured and the propagation time difference delta T in the two channels can be obtained as follows:
wherein: k (K) 1 ＝γ 2 /γ 1 -1；K 2 ＝M 2 /M 1 -1；
M 2 Is the molecular weight of air; m is M 1 Is the molecular weight of the purified measured gas.
The corresponding phase difference of two groups of received signals can be obtained by the ultrasonic transmission time difference delta T of two channelsThen according tof is the ultrasonic frequency loaded at the input end, and the concentration of the measured gas can be determined as follows:
from the formula, only the total phase difference between the measurement channel and the reference channel is needed to be knownThe concentration of the measured gas can be obtained.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM, random access memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean 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 application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the structures of this application and various modifications, additions and substitutions for those skilled in the art can be made to the described embodiments without departing from the scope of the application or from the scope of the application as defined in the accompanying claims.

Claims (9)

1. The utility model provides a gas measurement system based on ultrasonic transducer which characterized in that includes remote command center and on-the-spot detecting system, wherein:
the remote command center comprises a monitoring terminal and an information center database, wherein the monitoring terminal displays the gas measurement condition in real time, and the on-site detection system is reversely controlled through the monitoring terminal;
the on-site detection system comprises a collector, a sensor, an ultrasonic transducer and a controller, wherein the sensor comprises a temperature and humidity sensor and an oxygen sensor, and is connected with the collector; the collector receives and collects the environmental data collected by the sensor in real time and is in communication connection with the remote command center;
the controller monitors and analyzes the gas data transmitted by the collector, and judges and makes a decision according to preset rules and logic.
2. The gas measurement system based on the ultrasonic transducer according to claim 1, wherein the collector comprises a plurality of sensor interfaces, a data processing unit and a communication module, wherein the sensor interfaces are RS485 and are used for receiving gas data collected by the sensor; the data processing unit receives the gas data and processes and analyzes the gas data; the communication module is used for transmitting the processed gas data to the controller.
3. The ultrasonic transducer-based gas measurement system according to claim 2, wherein the data processing unit comprises a microprocessor, a computer chip, a memory and an algorithm module, the microprocessor sends instructions and data to the computer chip through a bus, coordinates and controls each functional module in the computer chip, and the microprocessor is connected with the algorithm module, and invokes and executes a specific algorithm through the transmission of the instructions and the data.
4. A gas measurement system based on an ultrasonic transducer according to claim 3, wherein the algorithm module comprises a two-channel differential phase detection model for detecting an estimated value of a phase difference of the gas flow signals by differential operation by receiving the gas flow signals of two channels.
5. The ultrasonic transducer-based gas measurement system of claim 4, wherein the field detection system further comprises a plurality of identical sets of ultrasonic transducers, and wherein the input data of the two-channel differential phase detection model is obtained by the ultrasonic transducers.
6. An ultrasonic transducer-based gas measurement method, characterized by being applied to the ultrasonic transducer-based gas measurement system according to any one of claims 1 to 5, comprising the following steps:
establishing a dual-channel differential phase detection model according to historical gas data;
acquiring temperature, humidity and oxygen concentration in a field environment through a sensor, measuring an airflow signal through an ultrasonic transducer, and detecting an estimated value of a phase difference of the airflow signal through differential operation;
determining a gas flow by calculating a phase difference estimate of the gas flow signal, calculating a flow value of the gas using the phase difference and the physical property parameter;
and carrying out data processing and analysis on the flow value of the gas, the temperature and humidity in the environment and the oxygen concentration through a collector to obtain an analysis result.
7. The ultrasonic transducer-based gas measurement method according to claim 6, wherein measuring the gas flow signal by the ultrasonic transducer comprises the steps of:
injecting air and gas to be detected into the detection cavity respectively by using a plurality of groups of same ultrasonic transducers;
the synchronous transmitting pulse driving signal drives the transducer, and the identical ultrasonic signals are received after passing through identical paths of the two chambers respectively;
and respectively measuring ultrasonic propagation parameters after passing through the detection cavity and the reference cavity, and calculating and inverting the concentration of the gas to be detected after difference.
8. The ultrasonic transducer-based gas measurement method according to claim 7, wherein the expression formula of the phase difference is:
wherein c 0 Sound velocity for background gas; c t The propagation speed of ultrasonic waves in air and gas to be measured is obtained; f is the driving frequency of the ultrasonic transducer;
the relationship between the sound velocity and the phase difference in the gas to be measured is represented by the following relationship:
c t ＝g(θ)
the relationship between the ultrasound propagation speed and the gas concentration is represented by the following relationship:
n＝f(g(θ))。
9. the ultrasonic transducer-based gas measurement method according to claim 8, wherein a calculation formula of a phase difference is substituted into the two-channel differential phase detection model to obtain the following calculation method:
wherein n is the gas concentration; c (C) pα The constant pressure specific heat capacity of the gas to be measured; c (C) vα The specific heat capacity of the gas to be measured is determined; c (C) pβ The constant pressure specific heat capacity of the air; c (C) vβ The specific heat capacity is the fixed capacity of air; m is M α Is the relative molecular mass of the gas to be measured; m is M β Is the relative molecular mass of air; f is the driving frequency of the ultrasonic transducer; t is the propagation speed; gamma ray β Is the air-borne moveout.
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