Method for accurately estimating propagation time of ultrasonic flowmeter under noise background

An ultrasonic flowmeter, time-of-flight technology, applied in the direction of liquid/fluid solid measurement, measurement device, test/calibration device, etc.

Active Publication Date: 2015-09-09
TIANJIN UNIV
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Problems solved by technology

[0006] In order to solve the problem of accurate measurement of ultrasonic propagation time in ultrasonic flowmeters under the background of noise, the present invention provides an accurate estimation method of ultrasonic propagation time based on the mixed index model of ultrasonic pulse receiving signals, so as to reduce measurement errors and improve the measurement accuracy of ultrasonic flowmeters.

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  • Method for accurately estimating propagation time of ultrasonic flowmeter under noise background
  • Method for accurately estimating propagation time of ultrasonic flowmeter under noise background
  • Method for accurately estimating propagation time of ultrasonic flowmeter under noise background

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Embodiment Construction

[0024] The following will take the gas ultrasonic receiving signal obtained by the experiment as the target object, and combine the steps and methods in the technical plan to give the parameter settings and implementation methods of each step:

[0025] Step 1: The center frequency of the ultrasonic transducer of the DN100 monophonic gas ultrasonic flowmeter is 120KHz. The Tektronix TBS 1102 oscilloscope is used in the experiment to collect the original signal received by the ultrasonic transducer. The time base is 10us / div, and the sampling time of the entire oscilloscope window is Be 10us / div*10 grid=100us, under 2500 data point storage depths, the time interval of adjacent sampling points is 100us / 2.5k=40ns, then in the supersonic pulse receiving signal mixing index model [2] (formula (1 )(2)) The related parameters are set as: sampling point serial number k=1,2,...2500, sampling time interval t s =40ns, transducer center frequency f c =120KHz, initial phase angle θ=0rad. ...

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Abstract

The invention relates to a method for accurately estimating propagation time of an ultrasonic flowmeter under a noise background. The method comprises the steps of experimenting the ultrasonic flowmeter; building an ultrasonic pulse receiving signal discrete model according to the experiment result; determining parameter vectors x including the ultrasonic propagation time; determining target functions according to an ultrasonic receiving signal and a model signal obtained by sampling in the experiment; creating a fitness function; performing the genetic algorithm; iterating to obtain an optimal solution to obtain the initial pheromone condition of the subsequent ant colony algorithm; initializing the ant colony pheromone through the optimal solution obtained by the genetic algorithm; determining the variation range of the parameter vectors x according to the ultrasonic receiving signal obtained in the experiment; determining whether ants are transferred and new optimal solution is obtained; volatilizing and updating the pheromone; iteratively calculating to obtain the optimal estimation value of the ultrasonic propagation time. The method can increase the accuracy of the parameter estimation.

Description

Technical field [0001] The invention belongs to the technical field of flow measurement and relates to an ultrasonic flowmeter. Background technique [0002] As a new flow instrument, ultrasonic flowmeter has developed rapidly in the past ten years, and has been widely used in large-scale water conservancy and hydropower projects and in the field of natural gas trade settlement, among which time-difference ultrasonic flowmeter is the most used as a metering instrument. Accurately determining the initial position of the ultrasonic transducer to receive the signal and obtaining accurate ultrasonic propagation time is the key to the accurate flow measurement of the time-of-flight ultrasonic flowmeter. At present, the double-threshold level method (referred to as the double-threshold method) is commonly used in the traditional measurement method. Firstly, through the non-zero-crossing comparison, determine which cycle signal is used as the timing start position, and then determi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F25/00G06N3/12
Inventor 郑丹丹侯惠让张涛
Owner TIANJIN UNIV
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