A quasi-distributed optical fiber liquid level sensor device and method for measuring liquid level

Abstract

The invention relates to a liquid level sensor, in particular to a sensor capable of remotely measuring and monitoring multiple liquid levels in different positions at the same time. A device of a quasi-distributed fiber optic liquid level sensor comprises a broadband light source, a wavelength division multiplexer, a fiber optic amplifier, a coupler, a circulator, one or multiple sensing strips, two photoelectric detectors, a data collection module, a relevant calculation module and a display module. According to the device, the Fresnel reflection effect of a fiber optic cross section is actively introduced and fully used, combined with the technology of cross correlation detection, simultaneous remote detection of multiple liquid levels in different positions in range of tens of kilometers is achieved; the device is passive in sensing link, safe in essence and resistant to electromagnetic interference; the structure is simple, and laying is flexible; by means of the broadband light source, measuring precision reaches the magnitude order of millimeter; liquid level measurement can be conducted in multiple positions at the same time; liquid level measurement can be conducted in long distance.

Description

technical field [0001] The invention relates to a liquid level sensor, in particular to a sensor capable of remotely measuring and monitoring liquid levels at multiple different positions simultaneously. Background technique [0002] In petrochemical, sugar refining, pharmaceutical, environmental monitoring and other occasions, there is often a need for measurement or monitoring of liquid levels. However, most of the existing measurement and monitoring technologies are sampling and measuring liquid levels at close range or on-site, which is easy to cause personal injury. Safety poses a threat, affects the production process, and the workload is heavy. How to provide a long-distance and simultaneous measurement and monitoring of liquid levels in multiple different positions, and has flexible laying, simple structure, multi-point simultaneous measurement, and long-distance large-scale measurement. The liquid level sensor is very necessary. Contents of the invention [0003]...

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Problems solved by technology

[0002] In petrochemical, sugar refining, pharmaceutical, environmental monitoring and other occasions, there is often a need for measurement or monitoring of liquid levels. However, most of the existing measurement and monitoring technologies are sampling and measuring liquid levels at close range or on-site, which is easy to cause personal injury. Safety poses a threat, affects the production process, and the workload is heavy. How to provide a long-distance and simultaneous measurement and monitoring of liquid levels in multiple different positions, and has flexible laying, simple structure, multi-point simultaneous measurement, and long-distance large-scale measurement. The liquid level sensor is very necessary

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