Gas flow velocity measuring device and system

Abstract

The invention relates to a gas flow rate measuring device and system, in particular to the field of gas flow rate detection. The invention provides a gas flow velocity measuring device. When the flow rate of a gas to be measured needs to be detected, the gas to be measured is introduced into the gas cavity of the gas flow rate measuring device, and the shape of the graphene film is changed under the action of the pressure intensity of the gas, so that the distance between metal particles in the metal particle layer is changed, the resonance condition of the metal particles in the metal particle layer and an optical signal is changed, an optical signal generated by the light source resonates with the metal particles in the gas cavity, due to the fact that the resonance condition of the metal particles in the metal particle layer and the optical signal is changed, the amount of the optical signal reaching the optical detector is changed, and the change of the resonance wavelength of the optical signal emitted by the gas cavity is detected through the optical detector. The gas flow rate is obtained according to the relationship between the change of the resonant wavelength emitted by the gas cavity and the flow rate of the to-be-measured gas.

Description

technical field [0001] The present application relates to the field of gas flow rate detection, in particular, to a gas flow rate measurement device and system. Background technique [0002] Gas flow rate The flow rate of gas is expressed by the volume of gas passing through the column or detector per unit time. The common unit is ml / min. There are many methods to measure the gas flow rate. In gas chromatography, due to the small gas flow rate, the load Gas and hydrogen flow rates are 20-150ml / min, and air flow rates are 200-1000ml / min. The pressure of the gas is low where the flow velocity is high, and the pressure is high where the flow velocity is low. [0003] In the prior art, infrared sensors are generally used to measure the gas flow rate in the pipeline. In practical applications, infrared sensors are used to measure the gas flow rate in the pipeline, and the gas flow rate is realized by detecting the fingerprint spectrum of the gas. Take measurements. [0004] Ho...

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