Optical fiber FP resonant cavity temperature sensor and manufacturing method thereof

Abstract

The invention discloses an optical fiber FP resonant cavity temperature sensor and a manufacturing method. The optical fiber FP resonant cavity temperature sensor comprises an optical fiber FP resonant cavity, the optical fiber FP resonant cavity is sleeved with a first protection tube, the end, close to the reflection end of the optical fiber FP resonant cavity, of the first protection tube is sealed, and the cavity of the first protection tube is filled with a heat-conducting medium. The first protection tube is fixedly connected to a connecting seat, a hollow second protection tube which sleeves the first protection tube is fixedly arranged on the connecting seat, the connecting seat is connected with an optical fiber protection sleeve, and an incident optical fiber of the optical fiber FP resonant cavity is arranged in the optical fiber protection sleeve. The sensor can realize long-term, high-precision, high-sensitivity and quick-response temperature monitoring of ocean, underground space and the like, and has the advantages of electromagnetic interference resistance, high stability and the like. According to the manufacturing method of the optical fiber FP cavity temperature sensor, the optical fiber FP cavity temperature sensor can be conveniently manufactured.

Description

technical field [0001] The invention relates to the field of temperature sensors, in particular to an optical fiber FP resonant cavity temperature sensor and a manufacturing method. Background technique [0002] For the ocean and underground space, temperature is a key parameter for environmental monitoring. Especially for the ocean, the change of seawater temperature has a significant impact on the organisms in the ocean and even the climate change on land. Accurate and rapid monitoring has far-reaching significance. [0003] Existing temperature sensors mostly use platinum resistors or negative temperature coefficient thermistors as sensitive elements, but for thermistors, the current is difficult to control, and heating often occurs during use, which will bring more serious problems to the measurement results. Large errors make it difficult to guarantee accuracy. In addition, in the face of the special environment of the ocean, electronic sensors generally cannot be use...

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Problems solved by technology

At present, the most common type of ocean temperature sensor is the fiber grating temperature sensor. Zhang Dengpan et al. used a metal sleeve to protect the fiber grating, and at the same time filled the metal tube with thermal fluid, which achieved fast response and high accuracy, but it was difficult to manufacture. Zhang Jing et al. also used fiber gratings as temperature sensing units, but the temperature measurement sensitivity and accuracy were not high; in addition to fiber gratings, Zhao Qiang et al. proposed a ship-borne disposable optical fiber using long-period fiber gratings for temperature measurement The seawater temperature and depth profile measurement system has improved temperature measurement accuracy, but it is still inferior to high-precision electronic sensors

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