Convoluted diaphragm-type optical fiber Bragg raster liquid level sensor

Abstract

The invention relates to a convoluted diaphragm-type optical fiber Bragg raster liquid level sensor which consists of optical fiber Bragg rasters (9), a convoluted diaphragm (6), a transfer lever (7),a constant-strength cantilever girder (8), a leading-in and leading-out optical fiber (2), a fixed seat (4), a seal ring (5) and a protective barrel (8), wherein the convoluted diaphragm (6) is connected with the constant-strength cantilever girder (8) through the transfer lever (7), and the optical fiber Bragg rasters (9) are adhered on the constant-strength cantilever girder (8); in addition, the fixed seat (4) is used for fixing the constant-strength cantilever girder (8); the convoluted diaphragm (6) is fixed between the protective barrel (8) and the seal ring (5), and the leading-in andleading-out optical fiber (2) is respectively connected to both ends of two optical fiber Bragg rasters (9) connected in series. According to the sensitivity differences of the two sensing rasters topressure and temperature, well-known differential operation in the field is adopted to measure and compensate temperature fluctuation interference pressure, thereby realizing the accurate measurementon pressure generated by static liquid level.

Description

technical field [0001] The invention relates to the technical field of optoelectronic measurement, in particular to a corrugated membrane type optical fiber Bragg grating liquid level sensor. Background technique [0002] In the modern industrial production process, the liquid level refers to the accumulation height and surface position of the liquid in tanks, towers, tanks and other containers, as well as natural rivers and reservoirs. The purpose of liquid level measurement is to determine the amount of liquid in the container through liquid level measurement, so as to ensure the liquid balance in each link of the production process and provide a reliable basis for economic calculation; in the case of continuous production, through liquid level measurement, understand the liquid Whether the position is within the specified range is of great significance to maintaining normal production, ensuring the output and quality of products, and ensuring safe production. Therefore, ...

AI Technical Summary

Problems solved by technology

In this scheme, the fiber Bragg grating is directly pasted on the corrugated diaphragm, so there are problems such as small measurement range, poor linear response of the sensor, and grating chirp caused by the strain difference of the diaphragm; at the same time, the ambient temperature and the applied pressure will be simultaneously Acting on the sensing grating pasted on the corrugated diaphragm, which seriously reduces the measurement accuracy of the pressure

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