Essential explosion-proof liquid level detection device and method

Abstract

The invention discloses an essence explosion proof type liquid level height detecting device and aw method. The essence explosion proof type liquid level detecting device comprises a wavelength analyzer, an optical cable, and a fiber grating buoyancy drawing device, wherein the fiber grating buoyancy drawing device comprises a buoyancy pontoon, a fiber grating and a fixing end, the wavelength analyzer emits light wave with certain frequency range to the fiber grating through the optical cable and receives the light wave reflected back by the fiber grating, the reflected light is analyzed, and the liquid level height of the liquid to be detected is calculated. Compared with the prior art, the device and the method have the advantages that the detected point can have no power supply, the device can be widely applied to explosive and flammable environment or highfield powerful electromagnetic environment such as petrochemical industry, and the like, the detection in a long distance can be realized; meanwhile, the detection accuracy is high, the millimetre-sized accurate measurement can be realized; moreover, the device and the method can realize network interconnection to intensively monitor the liquid level height of a plurality of places.

Description

technical field [0001] The invention relates to a buoyancy pulling device, an intrinsic explosion-proof liquid level detection device and a method, in particular to a buoyancy pulling device and an intrinsic explosion-proof liquid level detection device for detecting the liquid level height of a liquid container by using a buoyancy stretching optical fiber grating Detection device and method. Background technique [0002] In 1989, POREY reported for the first time that Fiber Bragg Grating (FBG for short) was used as a sensor device. Fiber Bragg Grating is a kind of fiber optic passive device, which is actually a section of fiber, and its core has a structure with a periodically changing refractive index, or a Bragg reflector in the fiber core. It utilizes the ultraviolet photosensitivity of the fiber material to expose the bare fiber to the interference pattern of the ultraviolet beam from the side through the double-beam interference method and the phase mask method, write...

AI Technical Summary

Problems solved by technology

However, this liquid level measurement method requires the introduction of voltage and electrical signals on the one hand, which is usually restricted to use in flammable, explosive and other occasions. For example, in the oil storage (oil tank) industry, liquid level measurement is still used Manual method, measuring personnel climb to the top of the oil tank every day, and measure the liquid level with a ruler

On the other hand, due to the high speed of the radar beam and the relatively small distance from the liquid surface, it is difficult to achieve accurate measurement by this method. Usually, the measurement accuracy of the liquid level can only reach the level of 10cm

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