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Method for detecting flight time of ultrasonic wave in flow speed measurement

A time-of-flight, ultrasonic technology, applied in measurement devices, fluid velocity measurement, velocity/acceleration/shock measurement, etc., can solve the problems of staying in the theoretical stage, small measurement range, difficult to practical application, etc. Large range, reducing the effect of sensor phase drift

Inactive Publication Date: 2014-11-05
成都成电电子信息技术工程有限公司
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Problems solved by technology

If the phase difference of a single frequency is used to calculate the flight time, the variation range of the measured flight time can only be within one ultrasonic cycle, and the measurement range is small, which is difficult to meet the requirements of practical applications
There are also methods using the multi-frequency method for measurement, but they are still in the theoretical stage and are difficult to use in practical applications

Method used

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  • Method for detecting flight time of ultrasonic wave in flow speed measurement
  • Method for detecting flight time of ultrasonic wave in flow speed measurement
  • Method for detecting flight time of ultrasonic wave in flow speed measurement

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0041] In this scheme, the method of measuring ultrasonic flight time is adopted to transmit dual-frequency ultrasonic waves. The specific method of the scheme is as follows:

[0042] Ultrasonic sending transducer emits two frequencies f 1 and f 2 of ultrasound. When the ultrasonic waves propagate in the medium for a period of time, the received waveform is and . When the fluid is flowing, the received phase becomes and . Let the phase difference between the two frequencies be with , then from the trigonometric formula we can get:

[0043]

[0044] First, according to the phase difference The size range of k can determine the relationship between k and k', when and In the same cycle, then k=k'. In the actual measurement, the phase will have a certain offset error due to factors suc...

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Abstract

The invention discloses a method for detecting a flight time of an ultrasonic wave in flow speed measurement and belongs to the technical field of detection of an ultrasonic wave instrument. The technical scheme of the method is as follows: the flight time of the ultrasonic wave is calculated by a method of double-frequency ultrasonic wave phase detection so as to effectively increase the range of instrument measurement. In addition, the method for detecting the flight time of the ultrasonic wave in the flow speed measurement is different from other multi-frequency ultrasonic wave measuring methods, and a solution under a condition that the phase drifting exits in a sensor is provided, so that the method has better practicability in the detection of the flow speed or the flow rate of the ultrasonic wave.

Description

technical field [0001] The invention relates to a detection method of an ultrasonic instrument, in particular to a detection method of an ultrasonic flight time. Background technique [0002] When ultrasonic waves propagate in a medium, the propagation time will be affected by the fluid flow velocity. When the sound wave and the fluid travel in the same direction, the flight time of the sound wave will decrease; when the sound wave and the fluid travel in the opposite direction, the flight time of the sound wave will increase. The speed of sound, fluid velocity, and time-of-flight are related as follows: [0003] t = L c + v [0004] Where t is the flight time of the sound wave, c is the speed of sound, v is the fluid velocity, and L is the distance. As long as the time-of-flight of the sound wave is measured, the fluid velocity can be obtained. In turn, fluid f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P5/24
Inventor 姜雨廷朱小波罗钧周
Owner 成都成电电子信息技术工程有限公司
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