Guangdong Ocean University

Xiaoguang Mu

Yuqiang Yang

Ji Wang

Yuting Li

Mingxin Liu

Jiale Gao

Kun Song

Lei Bi

Yuying Zhang

Wenhu Yang

Lin Sun

An optical fiber sensing system for temperature and salinity synchronous measurement is provided, which includes a broad-spectrum light source, an optical fiber circulator, a coupler, a first interferometer, a second interferometer, a third interferometer and a spectrometer; the first interferometer is insensitive to temperature and salinity; the second interferometer is sensitive to both temperature and salinity, and the third interferometer is only sensitive to temperature; light emitted by the broad-spectrum light source passes through the optical fiber circulator and enters the first interferometer; reflected light of the first interferometer passes through the optical fiber circulator and the coupler sequentially, and then enters the second and the third interferometers respectively; the reflected light of the second and the third interferometers enters the spectrometer after passing through the coupler; the temperature and the salinity to be measured are simultaneously obtained by performing spectral analysis of the reflected light entering the spectrometer.

Optical fiber sensing system for temperature and salinity synchronous measurement

A fiber optic temperature sensor, a sensing head structure, and a manufacturing method are provided. The fiber optic temperature sensor includes a broad spectrum light source, a first fiber optic coupler, a spectrometer, a first sensing interferometer, and a second sensing interferometer. The first sensing interferometer and the second sensing interferometer have opposite temperature responses. A first free spectral range corresponding to the first sensing interferometer is close to but not equal to a second free spectral range corresponding to the second sensing interferometer. In the fiber optic temperature sensor, two sensing interferometers both sensitive to temperature are used, and the two sensing interferometers have opposite temperature responses, thereby achieving an enhanced vernier effect, and improving the sensitivity of temperature measurement.

Fiber optic temperature sensor and sensing head structure

A high-sensitivity high-temperature sensor based on dislocation welding of suspended optical fiber is provided and includes a broadband light source, an optical fiber circulator, a sensing head and a spectrometer. The optical fiber circulator is connected to the broadband light source, the sensing head and the spectrometer individually, the sensing head includes a first single-mode optical fiber, a multi-mode optical fiber, a suspended core optical fiber and a second single-mode optical fiber which are connected in sequence. The high-sensitivity high-temperature sensor has the following advantages: simple to manufacture, no need for expensive special equipment; small sizes, compact structure, easy to use; full optical fiber structure, which can measure high temperatures up to 1000 degrees; no need for adhesive, good sensor stability; double cavities in parallel can generate vernier effects with high sensitivity.

High-sensitivity high-temperature sensor based on dislocation welding of suspended optical fiber

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Zhanjiang, China

Xiaoguang Mu