Reflective fiber sensor for liquid temperature measurement

Abstract

The invention discloses a reflective fiber sensor for liquid temperature measurement. The reflective fiber sensor comprises a fiber probe, a light source, a photoelectric conversion and filter-amplifier module, a division circuit, and an acquisition and display module. The fiber probe includes a transmitting fiber TF and two receiving fibers, namely, a first receiving fiber RF1 and a second receiving fiber RF2. The axis spacing between one receiving fiber and the transmitting fiber is different from the axis spacing between the other receiving fiber and the transmitting fiber. The first receiving fiber RF1 is arranged between the transmitting fiber RF and the second receiving fiber RF2, and the axes of the three fibers are in the same plane. The fiber probe further includes a sensor body, a reflector, and a liquid inlet sleeve, wherein the reflector and the sensor body are connected by the liquid inlet sleeve. The liquid inlet sleeve is provided with a plurality of liquid inlet holes. An incident fiber is connected with the light source. The output ends of the receiving fibers are connected with the acquisition and display module through the photoelectric conversion and filter-amplifier module and the division circuit in sequence.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, in particular to a reflective optical fiber sensor for liquid temperature measurement. Background technique [0002] Equipment such as transformers, steam turbine sliding bearings, and hydraulic oil tanks contain fluids, and the temperature range of the fluids in these equipments is very important for the normal operation of the equipment. When these devices are working, most of them are in harsh environments, such as high voltage, strong electromagnetic environment, narrow available space, and wide range of temperature changes. Traditional resistance temperature sensors and fiber optic temperature sensors are limited in these environments, such as the influence of electromagnetic fields on resistance temperature sensors and the influence of optical power changes on fiber optic temperature sensors. At the same time, the existing optical fiber temperature sensors are mainly based on...

AI Technical Summary

Problems solved by technology

Traditional resistance temperature sensors and fiber optic temperature sensors are limited in these environments, such as the influence of electromagnetic fields on resistance temperature sensors, the impact of optical power changes on fiber optic temperature sensors, etc.

At the same time, the existing optical fiber temperature sensors are mainly based on temperature-sensitive materials for detection, which has a certain hysteresis and the dynamic response is affected.

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