An acousto-optic coupled optical fiber liquid level sensor system

Abstract

The invention discloses a fiber-optic liquid-level sensor. The sensor is characterized in that an optical fiber stretching into the interior of a to-be-tested liquid is used as a measurement body; a structure used for simultaneously coupling light waves and sound waves into optical fiber is designed at one end of the optical fiber; the other end of the optical fiber is a free end and suspended in the to-be-tested liquid; and the surface of the optical fiber is covered with a coating layer which is not attached to the to-be-tested liquid. The acoustic-optic coupling fiber-optic liquid-level sensor has the following beneficial effects: the sensor is ultra-small in size; continuous measurement in a wide range is achieved; the sensor is non-metal and does not have conduction characteristics; the sensor is resistant to corrosion resistance and high and low temperature and is low in cost; and compared with a conventional liquid level sensor, the sensor has strong advantages in detection of liquid level under the extreme environment such as liquid hydrogen, liquid oxygen, liquid helium, water level in a nuclear reactor and conductive liquid.

Description

technical field [0001] The invention belongs to the intersecting field of optical fiber sensing technology, material science, optoelectronic technology and acoustic waveguide technology, relates to device packaging and photoelectric detection technology, and is specifically an optical fiber liquid level that uses acousto-optic coupling to realize large-range liquid level measurement sensor system. Background technique [0002] The liquid level sensor is a measuring instrument used to detect the height of the liquid. It is widely used in the production, storage, transfer and use of liquid, especially for extremely low temperature, high temperature, strong corrosive, highly toxic, volatile and flammable. For high-risk liquids, the sensing and monitoring of the liquid level is almost essential. Accurate liquid level monitoring is conducive to safe production and timely alarms when there is a risk of leakage. [0003] In liquid level sensors, optical fiber liquid level sensors ...

AI Technical Summary

Problems solved by technology

In addition, the existing technologies rarely provide universal solutions for use in extreme environments, which can measure liquid hydrogen, liquid oxygen, liquid helium, conductive liquids, and high-temperature nuclear reactor water levels, etc.

[0007] At the same time, there is no optical fiber liquid level sensor that introduces the acousto-optic optical fiber coupling method in the prior art

Check the global patent literature and authoritative journals, there is no relevant report

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