Non-fuzziness measuring method on ultrasonic transmission time

A technology of transmission time and measurement method, which is used in the measurement of ultrasonic/sonic/infrasonic waves, measurement devices, instruments, etc., to achieve the effect of high precision and good measurement stability

Inactive Publication Date: 2010-03-17
XIHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is applicable to all ultrasonic measurement objects

Method used

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  • Non-fuzziness measuring method on ultrasonic transmission time
  • Non-fuzziness measuring method on ultrasonic transmission time
  • Non-fuzziness measuring method on ultrasonic transmission time

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specific example

[0028] ④ Specific instance parameters:

[0029] The frequency of the signal sent for the first time is 40khz, the frequency of the signal sent for the second time is 41khz, the delay is 5us, and the test result is 5.014us. At this time, f 0 Δtmax =40.

[0030] The frequency of the signal sent for the first time is 400khz, the frequency of the signal sent for the second time is 320khz, the delay is 5.55us, the test result is 5.54us, f 0 Δt>1, and [f 0 Δt]=2,N max =-5.

[0031] Since the digitally controlled oscillators 12 and 15 are well-known technologies in the industry, only figure 2Make a brief description. The input of the frequency control word input port 19 and the data input by the numerically controlled oscillator frequency offset control word input port 20 are input in the digital adder 21 simultaneously, after adding in the digital adder 21, the output of the digital adder 21 is sent into The phase accumulator 22 continuously accumulates the input, and the out...

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Abstract

The invention aims at providing a method which removes phase fuzziness when measuring the ultrasonic transmission time through a phase method so as to accurately obtain the measuring value of the transmission time. The method is applicable to all ultrasonic measuring targets. The method emits two different frequency ultrasonic waves with a certain constraint relation and respectively measures thephase positions of two received frequency ultrasonic waves at the receiving terminal to finally obtain the non-fuzziness transmission time measuring value through operations such as subtracting, etc.

Description

Technical field: [0001] The invention relates to ultrasonic measurement technology, in particular to the measurement technology of ultrasonic propagation time. Background technique: [0002] Ultrasonic measurement technology is widely used in medical treatment, distance measurement, flaw detection, flow, gas concentration measurement and so on. The basic principle of ultrasonic measurement is to complete specific measurement tasks through the different speeds of ultrasonic propagation in the medium and the reflection of different medium interfaces. One very important aspect of this is the measurement of the time it takes for ultrasound waves to travel a certain distance in a particular medium. [0003] In the prior art, the precise measurement of the transmission time includes various measurement methods, and the method for obtaining the phase difference measurement of the transmitted and received signals is discussed here. Let the signal sent by the ultrasonic sensor be: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
Inventor 黄勇徐红
Owner XIHUA UNIV
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