All-fiber temperature, salt and depth sensor based on micro-nano fiber coupler interferometer
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A micro-nano optical fiber and sensor technology, applied in the field of optical fiber sensing, can solve the problems of being easily affected by pollution, weak mechanical strength, bulky, etc., and achieve convenient multiplexing, demodulation and array integration, low cost and high integration. Effect
Active Publication Date: 2021-11-12
NAT UNIV OF DEFENSE TECH
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[0008] The present invention aims at the defects of micro-nano optical fiber and micro-nano optical fiber coupler that are weak in mechanical strength and easily affected by pollution, and the existing temperature, salt and depth sensors are bulky and have low precision, and design an interferometer based on micro-nano optical fiber coupler All-fiber temperature, salt and depth sensor
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[0100] The sensor of the present invention adopts a reflective optical path design, and is based on a common wavelength tracking demodulation technology, which is convenient for array integration application. And the sensor has been filtered and structurally mechanically strengthened to meet the application requirements of shallow seas and deep seas. A specific implementation case of the full-sea array application of the optical fiber temperature, salt and depth sensor described in the present invention is as follows:
[0101] The seawater temperature will change with the depth. This vertical temperature change directly determines the internal wave and underwater acoustic transmission characteristics of seawater. Therefore, it is necessary to focus on monitoring to improve equipment safety and application efficiency. At present, the effective way to monitor and study the large-scale temperature field, hydroacoustic field and circulation characteristics in the ocean is to use t...
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Abstract
The present invention aims at the defects of micro-nano optical fiber and micro-nano optical fiber coupler that are weak in mechanical strength and easily affected by pollution, and the existing temperature, salt and depth sensors are bulky and have low precision, and design an interferometer based on micro-nano optical fiber coupler The all-fiber temperature, salt and depth sensor consists of micro-nano optical fiber coupler, sensor outer protective sleeve, sensor inner protective sleeve, two sensor inner protective sleeve caps, four sensor water inlet tank caps, four sensor water purification filter elements, Composed of two mirror films, sensor outer protective caps, optical fiber storage slots, and four filters, the sensor can simultaneously realize high-sensitivity sensing of three parameters of seawater temperature, salinity, and depth, with zero electronic components and a compact structure , high sensitivity, convenient integration and other performance advantages, and can block the influence of plankton, seaweed, sediment, etc. on sensor performance, and has good pressure resistance and stability.
Description
technical field [0001] The invention relates to an optical fiber sensing technology, in particular to an all-fiber temperature, salt and depth sensor based on a micro-nano fiber coupler (Opticalmicrofiber coupler, OMC) interferometer. Background technique [0002] The parameters of various elements of the marine environment directly affect marine economic development, marine environmental protection and global climate change, and are closely related to marine equipment, equipment operation efficiency and safety. For example, the distribution of seawater temperature and salinity directly determines the distribution of the oceanic layer, which in turn affects the safety of offshore and underwater platforms; in addition, dynamic environmental factors such as seawater temperature, salinity, depth, and flow velocity also directly determine the propagation of underwater sound. Features, which in turn determine the use and performance of sonar detection equipment. Therefore, real-...
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