阅读说明：本技术 一种基于tdc高分辨率集成芯片的超声波水表温度测量方法 (Ultrasonic water meter temperature measurement method based on TDC high-resolution integrated chip ) 是由 姚爽 张凯 杨明月 于 2021-01-12 设计创作，主要内容包括：本发明涉及一种基于TDC集成芯片的超声波水表温度测量方法。所述方法包括：用于支撑测量的超声波管道结构、一对超声波换能器、二个金属反射片、二个反射片支撑柱、两个密封圈、两个法兰盘以及TDC高分辨率芯片集成电路板。本发明基于TDC高分辨率集成芯片发送超声波脉冲信号激发上游超声波换能器,下游超声波换能器接收超声波包络回波信号计算时间t-(12)(或者发送超声波脉冲信号激发下游超声波换能器,上游超声波换能器接收超声波包络回波信号计算时间t-(21)),利用两个计算的时间值推导公式即可得到实时波速C,通过查询波速与液体温度的对应关系表得到实时温度。本发明无任何破坏性拆解,利用管道结构和高分辨率集成计时芯片推导公式来测量温度的方法,并且结构简单,集成度高,测量精度高,避免传统的温度传感器加复杂繁琐信号放大处理电路以及ADC采集电路的测温方法。(The invention relates to an ultrasonic water meter temperature measuring method based on a TDC integrated chip. The method comprises the following steps: the device comprises an ultrasonic pipeline structure for supporting measurement, a pair of ultrasonic transducers, two metal reflection sheets, two reflection sheet supporting columns, two sealing rings, two flange plates and a TDC high-resolution chip integrated circuit board. The invention is based on that a TDC high-resolution integrated chip sends an ultrasonic pulse signal to excite an upstream ultrasonic transducer, and a downstream ultrasonic transducer receives an ultrasonic envelope echo signal to calculate time t 12 (or sending an ultrasonic pulse signal to excite a downstream ultrasonic transducer, and receiving an ultrasonic envelope echo signal by an upstream ultrasonic transducer to calculate time t 21 ) And obtaining the real-time wave velocity C by using two calculated time value derivation formulas, and obtaining the real-time temperature by inquiring a corresponding relation table of the wave velocity and the liquid temperature. The invention has no destructive disassembly, utilizes the pipeline structure and the high-resolution integrated timing chip to deduce the formula to measure the temperature, and has simple structure and high integration levelThe temperature measurement method has high measurement precision, and avoids the temperature measurement method of a traditional temperature sensor and a complicated signal amplification processing circuit and an ADC acquisition circuit.)

1. An ultrasonic water meter temperature measuring method based on a TDC integrated chip. The method comprises the following steps: the device comprises an ultrasonic pipeline structure for supporting measurement, a pair of ultrasonic transducers, two metal reflection sheets, two reflection sheet supporting columns, two sealing rings, two flange plates and a TDC high-resolution chip integrated circuit board.

2. The ultrasonic pipe structure for supporting measurement according to claim 1, wherein the pipe is designed in a pipe structure with a diameter of D, two cavities are formed above the pipe, the distance between the centers of the cavities is L, and ultrasonic transducers are placed in the cavities.

3. The pair of ultrasonic transducers of claim 1, wherein the pair of ultrasonic transducers is capable of both transmitting ultrasonic signals and receiving ultrasonic envelope echo signals.

4. The metal reflection sheet according to claim 1, wherein the metal reflection sheet is disposed right below the ultrasonic transducers and forms an angle of 45 degrees with the horizontal axis, and an ultrasonic signal transmitted by the ultrasonic transducers is reflected by the reflection sheet and then received by another ultrasonic transducer.

5. The reflector support post of claim 1, wherein the reflector support post is perpendicular 90 degrees to the horizontal plane of the duct and fixedly supports the reflector structure.

6. A seal ring according to claim 1, wherein the seal ring is located in a cavity above the ultrasonic transducer and the ultrasonic pipe structure to ensure the tightness of the measuring device and at the same time to ensure the accuracy of the measurement.

7. The flange according to claim 1, wherein the flange is easy to install, the sealing performance of the connecting pipe is good, and the flange can be conveniently connected with outer pipes with different diameters.

8. The TDC high-resolution chip integrated circuit board as claimed in claim 1, wherein the TDC high-resolution chip is mainly used for transmitting a pulse square wave signal and calculating the arrival time of an ultrasonic echo signal, the TDC high-resolution chip is used for transmitting an ultrasonic pulse signal to excite an upstream ultrasonic transducer, a downstream ultrasonic transducer receives an ultrasonic envelope echo signal to calculate the downstream time as t₁₂Then sending an ultrasonic pulse signal to excite a downstream ultrasonic transducer, receiving an ultrasonic envelope echo signal by the upstream ultrasonic transducer to calculate the countercurrent time t₂₁And alternately triggering to generate pulse square waves and echo signals.

As shown in figure 1 of the drawings, in which,

the forward flow time equation represents:

the countercurrent time equation expresses:

the real-time sound velocity C of the ultrasonic wave can be deduced by the formula:

based on the strict corresponding relation between the sound velocity c and the temperature T, the ultrasonic downstream time T is measured₁₂Time of reverse flow t₂₁And the distance S between the center of the ultrasonic transducer and the center of the reflector plate, and the distance L between the centers of the two reflector plates, namely the temperature value can be obtained by looking up the table by the wave speed.

Technical Field

The invention relates to the field of liquid temperature measurement, in particular to an ultrasonic water meter temperature measurement method based on a TDC integrated chip.

Background

The wave speed of the ultrasonic wave in the liquid changes along with the temperature change of the liquid, and the instantaneous temperature of the liquid in the industrial field pipeline can be quickly and accurately measured by utilizing the characteristic feature. The ultrasonic temperature measurement method has no interference on the measurement of the measured liquid, has short response time and is suitable for various complex industrial environments, and compared with the traditional measurement method of the sensor signal amplification circuit and ADC acquisition, the ultrasonic temperature measurement method can achieve the requirements of rapidness, accuracy and wider temperature measurement range, and better meets and is suitable for the accurate measurement in industrial modern production and scientific research, particularly under the influence of high temperature and severe environment.

The ultrasonic temperature measuring method mainly utilizes the measuring principle of a U-shaped reflection type structure pipeline and a time difference method, and has the following basic principle: when the vector direction of ultrasonic wave propagation is the same as the flow vector of the liquid, the propagation speed of the ultrasonic wave is increased along with the increase of the flow speed of the liquid; when the vector direction of the ultrasonic wave propagation is opposite to the liquid flow vector, the ultrasonic wave propagation velocity decreases as the fluid velocity increases. The actual wave velocity of the ultrasonic wave is deduced according to the forward flow and backward flow propagation time of the ultrasonic wave signal in the liquid, and the actual temperature of the liquid is obtained by inquiring the corresponding relation of the sound velocity C-temperature T.

Disclosure of Invention

The invention aims to avoid the complicated method of the traditional temperature sensor and ADC acquisition, the precision of the temperature sensor and the precision of an ADC acquisition circuit in actual measurement need high requirements, and the circuit is complicated and complicated in process, the invention provides the ultrasonic water meter temperature measurement method based on the TDC high-resolution integrated chip, the technical means of the traditional temperature sensor is omitted, the time is accurately calculated by utilizing the TDC high-resolution integrated chip, the resolution of the calculation time of the TDC integrated chip is about 22ps, the temperature measurement precision is improved, the measured temperature result is displayed in real time by serial port data through a main controller of an integrated circuit board, and the specific technical scheme is as follows:

an ultrasonic water meter temperature measuring method based on a TDC integrated chip. The device comprises an ultrasonic pipeline structure for supporting measurement, a pair of ultrasonic transducers, two metal reflection sheets, two reflection sheet supporting columns, a sealing ring, a flange plate and a TDC high-resolution chip integrated circuit board.

In a preferred embodiment of the present invention, the support housing is an integral circular pipe structure, the pipe size is designed by a pipe structure with a diameter D, two cavities are formed above the pipe, the distance between the centers of the cavities is L, and a pair of ultrasonic transducers are respectively placed in the cavities.

In a preferred embodiment of the invention, a pair of ultrasonic transducers and a sealing ring are arranged in the cavity of the ultrasonic pipeline structure, the sealing ring ensures the sealing performance of the measuring device, and the pair of ultrasonic transducers can be used for transmitting an ultrasonic signal and receiving an ultrasonic envelope echo signal.

In a preferred embodiment of the invention, the flange plate is convenient to mount, the sealing performance of the connecting pipeline is good, and the flange plate is convenient to connect and measure with outer pipe diameters with different diameters.

In a preferred embodiment of the invention, the reflector plate support column is perpendicular to the horizontal plane of the pipeline by 90 degrees, and fixedly supports the reflector plate structure, the metal reflector plate is arranged right below the ultrasonic transducer and forms an included angle of 45 degrees with the horizontal axis, the ultrasonic signal in the vertical direction (horizontal direction) is mainly turned into the ultrasonic signal in the horizontal direction (vertical direction) so as to be in the same direction or opposite direction with the flow direction vector of the liquid, and the ultrasonic signal sent by the ultrasonic transducer is reflected by the reflector plate and then received by the other ultrasonic transducer.

In a preferred embodiment of the present invention, the specific usage is as follows:

the device adopts two ultrasonic transducers to measure the temperature, a pair of ultrasonic transducers and two sealing rings are vertically arranged in a cavity on the upper side of a pipeline at 90 degrees and are fixed, the surface of a probe of each ultrasonic transducer is contacted with liquid, a TDC high-resolution chip integrated circuit board alternately triggers an upstream ultrasonic transducer or a downstream ultrasonic transducer to generate pulse signals, and after a period of time, the upstream ultrasonic transducer or the downstream ultrasonic transducer receives ultrasonic echo signals, and the TDC high-resolution chip can automatically calculate the arrival time of the ultrasonic echo signals.

In a preferred embodiment of the invention, a TDC high-resolution integrated chip is used for sending an ultrasonic pulse signal to excite an upstream ultrasonic transducer, and a downstream ultrasonic transducer receives an ultrasonic envelope echo signalCalculating the downstream time as t₁₂Then sending an ultrasonic pulse signal to excite a downstream ultrasonic transducer, receiving an ultrasonic envelope echo signal by the upstream ultrasonic transducer to calculate the countercurrent time t₂₁And alternately triggering to generate pulse square waves and echo signals.

The time formula of the ultrasonic wave from upstream to downstream is as follows:

the time formula of the ultrasonic wave propagating from downstream to upstream is as follows:

the real-time sound velocity of the ultrasonic wave C can be deduced by the formula:

based on the strict corresponding relation between the sound velocity c and the temperature T, the ultrasonic downstream time T is measured₁₂Time of reverse flow t₂₁And the distance S between the center of the ultrasonic transducer and the center of the reflector plate and the distance L between the centers of the two reflector plates are used for calculating the real-time sound velocity c, storing 50 groups of wave velocity data and carrying out error correction, namely obtaining the real-time temperature by the corresponding relation between the temperature of the liquid and the wave velocity.

Compared with the prior art, the invention has the beneficial effects that: the invention utilizes the ultrasonic transducer pipeline structure which can be conveniently disassembled, utilizes the TDC high-resolution timing chip to send and calculate the arrival time of the ultrasonic echo signal, calculates the real-time wave velocity by calculating the downstream and upstream times, and obtains the real-time temperature by the corresponding relation between the wave velocity and the temperature.

Drawings

A better understanding of the present invention, and many of the attendant advantages thereof, will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, which form a part hereof, and which are illustrative embodiments and descriptions of the present invention which are to be considered as illustrative of the present invention and not restrictive, wherein:

FIG. 1 is a basic schematic diagram of an ultrasonic transducer installation of the method of the present invention.

FIG. 2 is a schematic view of the working flow of the measuring method of the present invention.

Detailed Description

The invention is further illustrated by the following examples in conjunction with the accompanying drawings. However, this embodiment is merely illustrative, and the scope of the present invention is not limited by this embodiment.

As shown in fig. 1, an ultrasonic water meter temperature measuring method based on a TDC high-resolution integrated chip includes an ultrasonic pipe structure 2 for supporting measurement, a pair of ultrasonic transducers 4 and 5, two metal reflectors 9 and 10, two reflector support posts 8 and 11, two seal rings 3 and 6, two flanges 1 and 7, and a TDC high-resolution chip integrated circuit board 12. A pair of ultrasonic transducers 4 and 5 and two sealing rings 3 and 6 are vertically arranged in a cavity on the upper side of an ultrasonic pipeline structure 2 for supporting measurement at 90 degrees and are fixed, the lower surfaces of probes of the ultrasonic transducers 4 and 5 are in contact with liquid, two reflecting columns 8 and 11 are vertical to the horizontal plane of the pipeline at 90 degrees, and two metal reflecting sheets 9 and 10 are respectively fixed on the reflecting sheet supporting columns 8 and 11 and form an included angle of 45 degrees with the horizontal axis. The two flange plates 1 and 7 can be connected with the outer pipe section, the TDC high-resolution chip integrated circuit board 12 alternately triggers the upstream ultrasonic transducer 5 or the downstream ultrasonic transducer 4 to generate pulse signals, after a period of time, the upstream ultrasonic transducer 5 or the downstream ultrasonic transducer 4 receives ultrasonic echo signals, and the TDC high-resolution chip integrated circuit board 12 can automatically calculate the arrival time of the ultrasonic echo signals.

As shown in FIG. 1, the TDC high-resolution chip integrated circuit board 12 transmits an ultrasonic pulse signalThe upstream ultrasonic transducer 5 is excited, and the downstream ultrasonic transducer 4 receives the ultrasonic envelope echo signal to calculate the time t₁₂The time formula for the ultrasonic wave to travel from upstream to downstream:

as shown in FIG. 1, the TDC high-resolution chip integrated circuit board 12 sends an ultrasonic pulse signal to excite the downstream ultrasonic transducer 4, and the upstream ultrasonic transducer 5 receives an ultrasonic envelope echo signal to calculate the time t₂₁The time formula for the ultrasonic wave to propagate from downstream to upstream is:

the formula can derive the ultrasonic real-time sound velocity C:

and obtaining the real-time wave velocity C by using two calculated time value derivation formulas, and obtaining the real-time temperature by inquiring a corresponding relation table of the wave velocity and the liquid temperature.

Step one) is explained by combining with the figure 2, the system is electrified and initialized, the TDC high-resolution chip integrated circuit board starts to work, a pair of ultrasonic transducers 4 and 5 and two sealing rings 3 and 6 are vertically arranged in a cavity at the upper side of the ultrasonic pipeline structure 2 for supporting and measuring at 90 degrees and are fixed, and two flange plates 1 and 7 are connected with an outer pipe section through flanges.

Step two) measurement process: as shown in fig. 2, after the flow rate of the liquid is stabilized, if the flow rate of the fluid is stabilized, the TDC high-resolution chip integrated circuit board 12 alternately triggers the upstream ultrasonic transducer 5 or the downstream ultrasonic transducer 4 to generate a pulse signal, and after a period of time, the upstream ultrasonic transducer 5 or the downstream ultrasonic transducer 4 receives the ultrasonic echo signal, and the TDC high-resolution chip integrated circuit board 12 may automatically calculate the arrival time of the ultrasonic echo signal.

Step three), data processing: the TDC high-resolution chip integrated circuit board 12 records the downstream time t of the measurement period at the moment respectively₁₂And a reverse flow time t21, a corresponding relation between the real-time wave velocity and the time value is deduced by using a formula, the central distance S between the ultrasonic transducer 5 and the reflector plate 9 and the distance L between the two reflector plates 9 and 10 are fixed values, and a plurality of numerical values can be measured by a vernier caliper and an average value can be calculated, so that the influence caused by errors is reduced. The method comprises the steps of utilizing serial port communication and a PC to interact data, collecting 50 groups of real-time wave velocity data, correcting real-time wave velocity errors, and calculating real-time temperature by utilizing a table look-up mode of the corresponding relation between the wave velocity C and the temperature T of liquid, so that the problem that the real-time temperature is collected by a traditional temperature sensor and a complex signal amplification circuit and ADC (analog-to-digital converter) collection circuit is avoided.

The above examples are only described to help understand the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.