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Fluid flow velocity measurement method based on terahertz high-speed echo effect

A technology of fluid flow velocity and echo effect, applied in fluid velocity measurement, velocity/acceleration/shock measurement, radio wave measurement system, etc., can solve the problem of low precision and achieve the effect of strong penetration

Active Publication Date: 2021-06-25
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

[0006] The fluid flow velocity measurement method based on the terahertz high-speed echo effect provided by the present invention solves the technical problem of low precision of the existing non-contact fluid flow velocity measurement method in complex and harsh environments

Method used

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  • Fluid flow velocity measurement method based on terahertz high-speed echo effect
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  • Fluid flow velocity measurement method based on terahertz high-speed echo effect

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Embodiment 1

[0055] The fluid velocity measurement method based on the terahertz high-speed echo effect provided by Embodiment 1 of the present invention includes:

[0056] Step S101, generating a source signal and a reference signal;

[0057] Step S102, detecting the terahertz echo of the source signal reflected by the fluid;

[0058] Step S103, according to the terahertz echo and the reference signal, obtain the time-domain spectral brightness deviation value;

[0059] Step S104, according to the different time-domain spectral brightness deviation values ​​corresponding to different flow velocities, establish a time-domain spectral brightness deviation-flow velocity relationship model;

[0060] Step S105, according to the time-domain spectral brightness deviation-flow velocity relationship model and the corresponding time-domain spectral brightness deviation value of the fluid to be measured, the fluid flow rate is obtained.

[0061] The fluid flow rate measurement method based on the ...

Embodiment 2

[0063] The fluid velocity measurement method based on the terahertz high-speed echo effect provided by the embodiment of the present invention includes:

[0064] Step S201, positioning the fluid flow velocity detection device using the fluid flow velocity measurement method based on the terahertz high-speed echo effect, so that the fluid flow velocity detection device faces the target fluid.

[0065] Step S202, using a QCL emission source to generate a source signal and a reference signal.

[0066] Step S203, using a QWP echo detector to detect the terahertz echo reflected by the fluid of the source signal.

[0067] Step S204, amplifying the terahertz echo, and obtaining the time-domain spectral brightness of the terahertz echo according to the amplified terahertz echo.

[0068] Step S205, according to the reference signal, obtain the brightness of the time-domain spectrum of the reference signal.

[0069] Step S206, according to the deviation between the time-domain spectra...

Embodiment 3

[0074] refer to figure 1 , the terahertz echo flow velocity measurement method based on manifold servo positioning provided by the present invention is composed of two main modules: a terahertz echo positioning module and a terahertz echo flow velocity measurement module:

[0075] The terahertz echo positioning module is composed of manifold detection, camera positioning and pan / tilt servo. Its workflow is firstly according to the fluid image acquired by the camera, grayscale the image during manifold detection, and use the Sobel operator to extract the grayscale image Edge sequence, the extracted edge sequence is used as the input of the camera positioning, and the center of gravity of the gray edge image is calculated using the center of gravity method, and then the image deviation vector is obtained after making a difference with the center of gravity of the camera image, which is used as the error input signal of the pan / tilt servo, using The PID controller calculates the ...

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Abstract

The invention discloses a fluid flow velocity measurement method based on a terahertz high-speed echo effect. The method comprises the steps: generating a source signal and a reference signal, detecting the terahertz echo, reflected by a fluid, of the source signal, obtaining a time-domain spectrum brightness deviation value according to the terahertz echo and the reference signal, establishing a time-domain spectrum brightness deviation-flow velocity relation model according to different time-domain spectrum brightness deviation values corresponding to different flow velocities, and obtaining the flow velocity of the fluid according to the time-domain spectrum brightness deviation-flow velocity relation model and the time-domain spectrum brightness deviation value corresponding to the to-be-detected fluid. According to the invention, the technical problem that the existing non-contact fluid flow velocity device has low detection precision on the flow velocity of the fluid in a complex and severe environment is solved; the characteristic of high penetrability of terahertz waves is ingeniously utilized, and terahertz signals can be received in a complex environment, so that the flow velocity of the measured fluid can be accurately measured; and the non-contact characteristic is achieved, so that great significance is achieved for flow velocity measurement of the fluid in the complex environment.

Description

technical field [0001] The invention mainly relates to the technical field of fluid flow velocity measurement, in particular to a fluid flow velocity measurement method based on the terahertz high-speed echo effect. Background technique [0002] In the field of fluid flow rate measurement, measurement methods can basically be divided into direct measurement and indirect measurement. Indirect measurement is basically applied to calculate the instantaneous flow rate indirectly through the height pressure conversion method under the condition that the volume of the container can be measured. The direct measurement method can be divided into two measurement methods: contact measurement and non-contact measurement. The contact detection equipment is represented by the classic flow rate flow meter. The detection device moves, and then the sensor detection device changes to obtain the flow rate value. The contact method has the characteristics of high detection accuracy, short resp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/58G01S17/58G01S7/48G01S7/41G01P5/26G06T7/00G06T7/13G06T7/246G06T7/269G06T7/66
CPCG01S13/58G01S7/418G01P5/26G01S17/58G01S7/4802G06T7/0002G06T7/13G06T7/66G06T7/246G06T7/269
Inventor 陈致蓬阳春华桂卫华
Owner CENT SOUTH UNIV
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