A microcavity interference flow velocity pressure difference sensitive structure and a microcavity interference fiber optic velocity flow sensor

Abstract

The invention discloses a microcavity interference flow velocity pressure difference sensitive structure and a microcavity interference optical fiber flow velocity flow sensor; it is used to solve the problem that the interference optical path of the existing optical fiber interferometer is very long, and there are serious polarization signal fading and signal temperature drift, which affect the measurement A question of precision. The microcavity interference flow rate pressure difference sensitive structure of the present invention includes a transmission optical fiber, a housing, an optical fiber collimator arranged in the housing, and a light beam splitting cube; the light beam splitting cube is connected and sleeved on the housing for sensing fluid The first pressure-sensitive diaphragm for static pressure and the second pressure-sensitive diaphragm for sensing fluid velocity pressure; the optical fiber collimator collimates the light wave signal in the transmission fiber and outputs it to the optical beam splitting cube, and the first 1. The interference light wave signal generated by the reflection of the second pressure-sensitive diaphragm is coupled into the transmission fiber; the light beam splitting cube divides the output light of the fiber collimator into two beams, and causes the reflected light of the first and second pressure-sensitive diaphragms to interfere An interference light wave signal carrying flow velocity and pressure difference information is formed.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a microcavity interference flow velocity differential sensitive structure for obtaining fluid velocity differential pressure light wave phase modulation information and a microcavity interference optical fiber velocity flow sensor for measuring fluid velocity and flow rate. Background technique [0002] The flow rate and flow rate of fluid are one of the most important monitoring parameters in the field of modern industrial control. There are many technologies and methods to realize fluid flow rate measurement (flow rate is usually realized by flow rate measurement), such as electronic flow rate flowmeter. However, for many special fluid velocity / flow measurements, such as crude oil flow testing of high-temperature and high-pressure oil wells, conventional electronic measuring instruments are limited by temperature limitations, electromagnetic interferen...

AI Technical Summary

Problems solved by technology

However, the interference optical path of the traditional fiber optic interferometer is very long, and there will inevitably be serious polarization signal fading and signal temperature drift, which will affect the measurement accuracy; at the same time, there is a certain distance between the two pressure sensitive points for obtaining the flow velocity and pressure difference, which will inevitably introduce serious static pressure. Interference, resulting in a decrease in measurement sensitivity

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