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Signal processing method of propagation speed differential type ultrasonic flowmeter

A technology of propagation speed and signal processing, which is applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, measuring devices, etc. It can solve the problems of low signal processing accuracy and poor propagation speed, etc., and achieve simple and clear physical background, eliminate Ambiguity, the effect of reducing sources of error

Inactive Publication Date: 2006-07-19
TIANJIN UNIV
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Problems solved by technology

[0007] The main problem to be solved by the present invention is that the signal processing accuracy of the differential velocity ultrasonic flowmeter, especially the ultrasonic flowmeter used for gas flow detection is not high

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  • Signal processing method of propagation speed differential type ultrasonic flowmeter
  • Signal processing method of propagation speed differential type ultrasonic flowmeter
  • Signal processing method of propagation speed differential type ultrasonic flowmeter

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Embodiment Construction

[0023] The invention proposes a novel signal processing method of an ultrasonic flowmeter—code correlation measurement technology. An important and relatively early application of coding with excellent autocorrelation characteristics is ranging. Whether it is traditional radar ranging or today's most advanced satellite navigation Global Positioning System (GPS), its propagation time measurement accuracy can reach the level of an approximate atomic clock . The train of thought of the present invention originates from above-mentioned fact.

[0024] The principle of using coding correlation technology for high-precision measurement of ultrasonic gas flowmeter propagation time is as follows: According to relevant theories, such as figure 1 , the correlation function R of the upstream aa' transmitted signal x(t) and the downstream bb' received signal y(t) xy (τ) The time τ corresponding to the peak position 0 That is the transit time (that is, the propagation time of the signal)...

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Abstract

The invention relates to a signal processing method of propagation speed difference type ultrasonic flow meter used to measure the propagation time in measuring pipe of ultrasonic signal so as to measure the speed of the flow. The method comprises: (1) using coding modulating ultrasonic signal with self-relative character to generate the sending signal; (2) carrying the flow information by pipe flow field propagation by the sending signal; (3) receiving the sending signal with flow information and doing relative computing with the sending signal of the step one; (4) measuring the propagation time of the ultrasonic signal by the peak location of the relative function to compute the speed of the flow.

Description

technical field [0001] The invention belongs to the category of ultrasonic flowmeters, in particular to a signal processing method for ultrasonic flowmeters. Background technique [0002] For a long time, although orifice flowmeters and turbine flowmeters have been widely used in natural gas flow measurement, there are some shortcomings in their inherent structure and principle, such as small turndown range of orifice flowmeters, large pressure loss, and great influence on pulsating flow. Sensitive; compared with the former, although the turbine flowmeter has higher accuracy and wider range ratio, it has moving parts and requires high cleanliness of the medium. As people pay more and more attention to energy issues, the requirements for flow meters also increase. In particular, the transmission and measurement of natural gas has always been the main subject that people care about, and how to balance the accuracy of measurement and the convenience of instrument installation ...

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Application Information

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IPC IPC(8): G01F1/66
Inventor 张涛王超蒲诚
Owner TIANJIN UNIV
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