Ultrasonic wave sensor for flowmeter

An ultrasonic and flowmeter technology, applied in the direction of volume measurement, flow measurement/mass flow, liquid/fluid solid measurement, etc., can solve the problems of non-uniformity, uneven ultrasonic signal strength, and signal asymmetry.

Inactive Publication Date: 2014-05-07
HARBIN INST OF TECH AT WEIHAI
View PDF8 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The function of the ultrasonic sensor is to convert mechanical energy into electrical energy, that is to say, to convert the ultrasonic signal in the form of pulse into electrical pulse signal, and the received energy is not concentrated enough , Mainly because there is a difference in received signal strength between the central part and the surrounding part, so the sensor has non-uniformity in received signal strength, which will reduce the signal-to-noise ratio of the received signal;
[0006] (2) Although there is non-uniformity in the forward and reverse directions, the non-uniformity in the forward and reverse directions is incon

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ultrasonic wave sensor for flowmeter
  • Ultrasonic wave sensor for flowmeter
  • Ultrasonic wave sensor for flowmeter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] An ultrasonic sensor for a flowmeter according to the present invention, its structure includes a piezoelectric element 2, a housing 3, a base 4, an adhesive layer 5, a buffer layer 6, a ground electrode 7, a drive electrode 8, a ground electrode lead wire 9, a drive electrode Lead wires 10, ground electrode terminals 11, and drive electrode terminals 12; the base is provided with a housing 3, a cavity is formed between the base 4 and the housing 3, and a buffer layer is provided in the cavity from the base to the housing in sequence 6. A piezoelectric element 2 and an adhesive layer 5 with a driving electrode and a ground electrode are provided on the surface; the driving electrode terminal 12 is connected to the driving electrode 8 through the driving electrode lead wire 10, and the driving electrode terminal 12 penetrates the base 4 and is formed with the base 4. An integrated structure; the ground electrode terminal 11 is connected to the ground electrode 7 through t...

Embodiment 2

[0059] An ultrasonic sensor for a flowmeter according to the present invention, its structure includes a piezoelectric element 2, a housing 3, a base 4, an adhesive layer 5, a buffer layer 6, a ground electrode 7, a drive electrode 8, a ground electrode lead wire 9, a drive electrode Lead wires 10, ground electrode terminals 11, and drive electrode terminals 12; the base is provided with a housing 3, a cavity is formed between the base 4 and the housing 3, and a buffer layer is provided in the cavity from the base to the housing in sequence 6. A piezoelectric element 2 and an adhesive layer 5 with a driving electrode and a ground electrode are provided on the surface; the driving electrode terminal 12 is connected to the driving electrode 8 through the driving electrode lead wire 10, and the driving electrode terminal 12 penetrates the base 4 and is formed with the base 4. An integrated structure; the ground electrode terminal 11 is connected to the ground electrode 7 through t...

Embodiment 3

[0062] An ultrasonic sensor for a flowmeter according to the present invention, its structure includes a piezoelectric element 2, a housing 3, a base 4, an adhesive layer 5, a buffer layer 6, a ground electrode 7, a drive electrode 8, a ground electrode lead wire 9, a drive electrode Lead wires 10, ground electrode terminals 11, and drive electrode terminals 12; the base is provided with a housing 3, a cavity is formed between the base 4 and the housing 3, and a buffer layer is provided in the cavity from the base to the housing in sequence 6. A piezoelectric element 2 and an adhesive layer 5 with a driving electrode and a ground electrode are provided on the surface; the driving electrode terminal 12 is connected to the driving electrode 8 through the driving electrode lead wire 10, and the driving electrode terminal 12 penetrates the base 4 and is formed with the base 4. An integrated structure; the ground electrode terminal 11 is connected to the ground electrode 7 through t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to an ultrasonic wave sensor for a flowmeter. The ultrasonic wave sensor comprises a piezoelectric element consisting of a piezoelectric module and a virtual piezoelectric element module, a shell, a base, a sound emitting surface grounding electrode, a side face grounding electrode, a back grounding electrode, a driving electrode, a grounding electrode lead, a driving electrode lead, a grounding electrode terminal and a driving electrode terminal. A working principle is that ultrasonic wave sensors are arranged on the upstream and the downstream of a fluid passage with a specified sectional area respectively, one of the ultrasonic wave sensors on the upstream and the downstream emits ultrasonic waves, the other receives the ultrasonic waves, the two ultrasonic wave sensors alternately work, and the ultrasonic waves are overlapped with fluid velocity when the ultrasonic waves are transmitted forwards and backwards, so that time difference exits between the forward ultrasonic wave transmission time and the backward ultrasonic wave transmission time, and the fluid velocity can be calculated sequentially. Compared with the prior art, the ultrasonic wave sensor has the advantages that asymmetry of an ultrasonic wave receiving sensitivity characteristic is improved by adjusting the intensity distribution of the ultrasonic waves output by the piezoelectric element, a signal to noise ratio (S/N) of an ultrasonic flowmeter inspection signal can be improved and the flow measuring accuracy is improved.

Description

technical field [0001] The invention relates to an ultrasonic sensor, in particular to an ultrasonic sensor for a flow meter. Background technique [0002] As we all know, an ultrasonic flowmeter is a device for measuring the flow of fluids such as gas and liquid, and an ultrasonic sensor is one of the key components of an ultrasonic flowmeter. When the time difference method is used to measure the fluid flow velocity, the working principle is to install an ultrasonic sensor on the downstream and downstream of the fluid flow path with a specified cross-sectional area. One of the upstream and downstream ultrasonic sensors emits ultrasonic waves and the other receives ultrasonic waves. They work alternately. During transmission, its propagation velocity is superimposed on the fluid velocity, so there is a time difference in the propagation time of forward and reverse ultrasonic waves, based on which the fluid velocity can be calculated, and then the flow value can be obtained....

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01F1/66G01F15/00
Inventor 王翥佟晓筠佟少强郭茂林
Owner HARBIN INST OF TECH AT WEIHAI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products