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In view of the demand for seawater temperature profile measurement, this article propose a new approach- system for continuous measurement of temperature profile with fiber bragg grating sensor, after analyzing the advantages and disadvantages of existing methods. In this measurement system, the fiber grating sensor is a measurement unit, and the distributed real-time measurement is realized by using a drag chain with the wavelength division multiplexing. At the same time, we can read the physical parameters in real time by the demodulation terminal on the deck. This method can be used to obtain high resolution seawater temperature profile at low cost, and to provide a rich and effective data for the ocean survey. In this article, we design and manufacture the deck demodulation terminal and 60m long chain of towed chain system, and carry out the experiment  in Qingdao which provide a large amount of data. The results prove that the equipment has practical value.

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In [order to meet China's] demand for seawater temperature profile measurement, this [paper proposed] a new approach- [the continuous measurement system] of temperature profile [based on] fiber bragg grating sensor after analyzing the advantages and disadvantages of existing methods. In this measurement system, the fiber grating sensors [serve as] measurement units, [which are connected into the shipborne dragging chain by the method of wavelength division multiplexing] .[Then the measured physical parameters can be real-time displayed by the demodulation terminal on the deck, thus realizing the distributed real-time measurement.] [With this method, we can  obtain high resolution seawater temperature profile with higher efficiency and lower cost, providing abundant and effective data for the ocean survey]
In this [paper], [our research team designed and manufactured the deck machinery] and [a 60m long dragging chain of the drag chain system], and [carried] out the [testing experiment] in Qingdao [offshore] [for obtaining the real time experimental data, which proved our expected outcomes.]
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