A device and method for temperature measurement based on coated micro-nano optical fiber
A technology of micro-nano optical fiber and temperature measurement, which is applied in the direction of measuring devices, thermometers, measuring heat, etc., can solve the problems of stress sensitivity, temperature, stress cross sensitivity, fiber grating temperature sensitivity, etc., and achieve high sensitivity, simple principle, Effects that are easy to reuse on a large scale
Inactive Publication Date: 2015-10-28
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
However, fiber gratings are not only sensitive to temperature, but also sensitive to stress, and there is a problem of cross-sensitivity between temperature and stress.
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[0031] see figure 1 , the micro-nano fiber of the device in this embodiment is obtained by heating and stretching a common single-mode fiber (125 microns in diameter), and the final micro-nano fiber has a diameter of 1 micron to 10 microns. The micro-nano fiber includes a common single-mode fiber 1 , a transition region 2 and a uniform region 3 . Since the diameter of the micro-nano fiber is on the order of microns, a large part of the energy exists outside the physical boundary of the micro-nano fiber in the form of the evanescent field 4 . In order to make the micro-nano fiber sensitive to the temperature of the external environment, the surface of the micro-nano fiber is covered with a layer of coating material 5, which absorbs the energy of the evanescent field 4, so that light will be introduced when it is transmitted in the micro-nano fiber additional loss. When the external temperature rises, due to the enhanced thermal motion of molecules, the light absorption of the...
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Abstract
The invention discloses a conducting temperature measurement device and a method based on coating micro-nano optical fibers. The conducting temperature measurement device and the method based on the coating micro-nano optical fibers comprises a narrow linewidth laser device, an optical fiber isolator, an optical fiber coupler, micro-nano optical fibers, coating materials, a signal optical detector and a reference optical detector, wherein a coupled mode of the optical fiber coupler is 2*2. The output end of the laser device is connected to a first port of the optical fiber coupler after the output end of the laser device is connected to the optical fiber isolator through the optical fibers. The signal optical detector is connected with the coated micro-nano optical fibers and is connected to a third port of the optical fiber coupler. The reference optical detector is connected to a fourth port of the optical fiber coupler through the optical fibers. The conducting temperature measurement device and the method based on the coating micro-nano optical fibers have the advantages that temperature measurement is implemented by utilizing a micro-nano optical fiber large evanescent field feature. Absorption feature of the micro-nano optical fibers coating materials can be changed due to the fact that outer circumstance temperature is changed. Finally, output optical power is led to change. The defects that an original optical fiber temperature measurement structure is complex and signals are difficult to handle and the like are overcome. The conducting temperature measurement device and the method based on the coating micro-nano optical fibers is convenient to reuse and can conduct quasi-distributed measurement in an real-time online mode.
Description
technical field [0001] The invention relates to a device and method for temperature measurement based on coated micro-nano optical fiber. Background technique [0002] With the improvement of industrial automation and the expansion of continuous production scale, more and higher requirements are put forward for the measurement of temperature parameters. At present, the commonly used thermocouple is difficult to measure the temperature accurately. This kind of contact measurement is also difficult to guarantee the original characteristics of the temperature field, which is easy to cause errors. Moreover, the metal thermocouple must be in contact with the object to be measured, so it is damaged quickly and increases the cost. The development of optical fiber technology provides favorable prerequisites for the application of non-contact temperature measurement technology in industrial production, and solves many problems that cannot be solved by thermocouples and conventional...
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IPC IPC(8): G01K11/32
Inventor 宋章启卫正统张学亮阳明晔陈宇中李松洋孟洲
Owner NAT UNIV OF DEFENSE TECH