Gas solid two-phase flow granule density detection device and method based on terahertz transmission and detector

Abstract

The utility model relates to a device and a method for detecting the particle concentration of the gas-solid flow based on the terahertz (THz) electromagnetic emission and detection device, comprising a femto-second laser, a coupling transmission optical fiber, a photoconductive antenna type THz electromagnetic emitter, an optical delay unit, an off-axis parabolic mirror, a THz detector, a phase-lock amplifier, a high-frequency power amplifier and a data acquisition and processing system controlled by a computer. The utility model reflects the THz wave sent from the THz electromagnetic emitter in parallel via the off-axis parabolic mirror and the THz wave through the gas-solid flow is condensed to the THz detector via the off-axis parabolic mirror. The particle concentration of the gas-solid flow on the section of a pipeline can be calculated with different models according to the measured THz time domain signal. The utility model has the advantages of simple structure, convenient installation, high measuring accuracy, safe use, and wide application in fields of petroleum, chemical industry, energy, metallurgy and environment.

Description

technical field [0001] The invention belongs to the technical field of two-phase flow / multiphase flow detection, and in particular relates to a particle concentration detection device and method of a gas-solid two-phase flow based on a terahertz emission and detection device. Background technique [0002] Terahertz (1THz=10 12 Hz) radiation usually refers to electromagnetic wave radiation with a frequency range from 0.1THz to 10THz, and the electromagnetic wave in this band is just between microwave and infrared light. The terahertz wave has the following characteristics: (1) The photon energy of the terahertz radiation is very low, and the photon energy of the frequency around 1THz is about 4meV, which is 1 / 106 of the X-ray, and has no radiation hazard to the human body, so it is a kind of Very safe ray. (2) THz waves have a strong penetrating ability to most non-polar substances, and can pass through packaging materials to detect internal substances. (3) Sub-picosecond ...

AI Technical Summary

Problems solved by technology

Detection devices based on microwave radiation sources have disadvantages such as difficult installation and calibration, and the measurement results are easily affected by other chemical components in the fluid (such as water, ammonia, etc.)

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