A liquid flow velocity detection device and detection method based on positron technology and vortex street phenomenon

Abstract

The invention discloses a liquid flow velocity detection device and detection method based on positron technology and vortex street phenomenon. Firstly, the active positron nuclide is injected into the liquid, and then the liquid is injected from the access pipe of the detection component. The vortex generator causes the Kalman vortex street phenomenon to form when the liquid flows through the generator, forming a vortex, and then uses the gamma photon detection device to detect the gamma photons generated by the positron decay of the nuclide, and uses the number of gamma photon events detected The peak and valley changes of the vortex can get the shedding frequency of the vortex, so as to calculate the flow rate of the liquid through the pipeline per unit time. The invention can detect the gamma photon response line of the liquid that produces the Kalman vortex street phenomenon in a relatively harsh environment (such as high temperature, high pressure, corrosion, and impurities) in real time and non-destructively on-line or on-site, so as to realize the measurement of the flow rate of the liquid in the pipeline. Function.

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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