Optical fiber temperature sensor for rapid marine temperature measurement

Abstract

The invention provides an optical fiber temperature sensor for rapid marine temperature measurement, and the sensor comprises a long-period fiber bragg grating, a shell, a stretching structure and two plugs, wherein the shell is a cylinder and a circular hollow-shaped containing part is arranged in the middle of the shell; small holes are respectively arranged at centers of two ends of the containing part; open-shaped circular holes are arranged at the outer sides of the two small holes, wherein the diameter of the open-shaped circular holes is more than that of the small holes; the long-period fiber bragg grating is placed in the containing part of the shell and passes through the small holes though optical fibers at two ends of the long-period fiber bragg grating; the stretching structure is located in one end of the shell and is used for fixing the long-period fiber bragg grating and providing constant tensile force, so as to ensure that the long-period fiber bragg grating is at a stretched state all the time; the two plugs are cylinders and the diameter of each plug is the same as that of the circular holes at the two ends of the shell; a hole through which the optical fibers can pass is arranged at the center of each plug, and the optical fibers pass through the holes.

Description

technical field [0001] The invention relates to an optical fiber sensor technology, in particular to a temperature measuring sensor used for high-precision and rapid measurement of seawater temperature. Different from the traditional electronic temperature measurement technology, the sensor can work passively, without electronic insulation, seawater leakage and other problems, and the sensitive unit of the sensor is an optical fiber, which has a large surface area / volume ratio and the ability to respond quickly. This technology invented Provide a new high-precision temperature measurement method for the field of ocean temperature measurement. Background technique [0002] Seawater temperature is the most important physical parameter of seawater. Measuring seawater temperature plays an important role in scientific investigation, national defense, offshore oil and gas exploration, fishery production, etc. [0003] The core of the temperature sensor: high precision, fast resp...

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Problems solved by technology

[0008] In addition, the increasingly mature ordinary fiber grating temperature measurement technology cannot meet the needs of ocean temperature measurement.

Ordinary Fiber Bragg Grating (FBG) sensing technology has a wide range, generally from -30°C to 150°C, but the resolution is only 0.01°C. The sensitivity is generally only 10pm / °C, and often due to the metal armor protection The heat capacity of the structure and temperature-sensitizing substances is large, and the transient response time to temperature has not been paid enough attention, which is far from meeting the needs of ocean temperature measurement

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