Liquid flow rate detection device and detection method based on positive electron technology and vortex street phenomenon

Abstract

The invention discloses a liquid flow rate detection device and detection method based on positive electron technology and vortex street phenomenon. The detection method comprises the following steps:firstly injecting positive electron nuclide with activity into the liquid, and then injecting the liquid from an access pipe of a detection module, enabling the liquid to produce Kalman vertex streetphenomenon when flowing through a generating body through the vortex generating body, thereby forming the vortex; and then detecting the gamma photon produced by the positive photon decay of the nuclide by utilizing the gamma photon detection device, and obtaining the falling frequency of the vortex by utilizing the peak value and valley value of the detected gamma photon event number, thereby computing the flow rate passing through the pipeline by the liquid in the unit time. The gamma photon response line of the liquid for producing the Kalman vortex street phenomenon under a harsh environment (such as high temperature, high pressure, corrosion and impurity) can be real-time, nondestructively and online or in-place detected, thereby realizing the function of measuring the liquid flow rate in the measurement pipeline.

Description

technical field [0001] The invention relates to the technical field of liquid flow velocity detection in pipelines, in particular to a liquid flow velocity detection device and detection method based on positron technology and vortex street phenomenon. Background technique [0002] Positron imaging technology is a relatively advanced clinical examination imaging technology in the field of nuclear medicine, which is widely used in clinical and basic research. The basic process of positron imaging is generally as follows: use an accelerator to produce positron nuclides, or use a hand-held generator such as IGG100 Gallium-68 Generator to generate nuclides; use a positron emitter to label the carrier to be detected; use a detector to detect γ Decay of photons; process data and get online results for flow velocity. When a positron-emitting nuclide decays, the nucleus removes its excess positive charge by emitting positrons to achieve equilibrium. occur beta + During the decay ...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the existing liquid flow rate detection methods, such as poor anti-interference performance, vibration, strong electromagnetic field, high temperature environment, etc. will affect the final measurement effect

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