Optical fiber temperature measurement system based on fluorescence characteristics of erbium-doped optical fiber

Abstract

The invention discloses an optical fiber temperature measurement system based on fluorescence characteristics of an erbium-doped optical fiber. The system comprises a current driver, the current driver is connected with a laser diode, the laser diode is connected with an input port of an optical power divider, an output port of the optical power divider is respectively connected with an optical power meter A and a wavelength division multiplexer, the wavelength division multiplexer is respectively connected with a high-temperature-resistant erbium-doped optical fiber and an optical power meterB, the optical power meter A and the optical power meter B are respectively connected with a sampling circuit, and the sampling circuit is connected with a single-chip microcomputer. According to theoptical fiber temperature measurement system based on fluorescence characteristics of an erbium-doped optical fiber, 90% of the light energy input into the optical power divider from the laser diodeis output to a port A of the wavelength division multiplexer, 10% of the light energy enters the optical power meter A, the two groups of light intensities are linearly converted into current signalswhich are output and enter the sampling circuit at the same time, the single-chip microcomputer calculates the ratio of current signal output results of two channels of the sampling circuit, and the measured temperature can be accurately calculated through the result of the ratio.

Description

technical field [0001] The invention relates to the technical field of optical fiber temperature measurement systems, in particular to an optical fiber temperature measurement system based on the fluorescence characteristics of erbium-doped optical fibers. Background technique [0002] At present, most of the internal temperature detection methods of transformers on the market are based on bonding phosphor powder to the end face of ultraviolet quartz optical fiber through adhesive, and detecting the temperature by detecting the fluorescence intensity or fluorescence time of phosphor powder. When the temperature of the adhesive is too high, it is easy to decompose. It will affect the insulation performance of transformer oil and limit the temperature measurement range. The phosphor powder temperature measurement is point-type temperature measurement. The optical fiber transmission part has no temperature sensing capability. The ultraviolet quartz optical fiber is expensive, ha...

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Problems solved by technology

[0002] At present, most of the internal temperature detection methods of transformers on the market are based on bonding phosphor powder to the end face of ultraviolet quartz optical fiber through adhesive, and detecting the temperature by detecting the fluorescence intensity or fluorescence time of phosphor powder. When the temperature of the adhesive is too high, it is easy to decompose. It will affect the insulation performance of transformer oil and limit the temperature measurement range. The phosphor powder temperature measurement is point-type temperature measurement. The optical fiber transmission part has no temperature sensing capability. The ultraviolet quartz optical fiber is expensive, has a large bending radius, is easy to break, and is expensive. In view of these defects, it is necessary to design an optical fiber temperature measurement system based on the fluorescence characteristics of erbium-doped optical fiber

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