Research on Temperature Sensing Characteristics of Micro-Nano Fiber Interferometer Based on Different Configurations in Fiber Laser

Temperature sensor is a common piece of equipment in daily life. It is extensively employed in fields including biological sciences, oceanography and contemporary city planning. Among them, optical fiber is regarded as a superb example of a high-value sensing materials in practical use because of its compact size, light weight, resistance to corrosion, and ability to prevent electromagnetic interference in nano devices. The specific principle of temperature sensing via optical fiber is demonstrated. The three indicators for optical sensors are detection sensitivity, system stability, and response time. A very low level of sensitivity leads to a huge detection error, which will affect its practicality. Poor system stability results in a high rate of false positives, which cannot be tolerated for environmental surveillance. In the process of minute-by-minute modernization, response speed is also crucial. By avoiding unnecessary troubles in the actual temperature monitoring process, the feasibility of the system can be greatly improved.

The thesis will concentrate on the generation of laser and wavelength shift as the starting point, then introduce the fiber laser sensor working principle systematically, and thoroughly investigate the stimulated radiation amplified light sustained operation. The improvement of detection sensitivity will be the first major chapter of this thesis. The thermal-optical effects of some solutions will be fully exploited. With systematically studied, fully understand and reasonable application of unique high thermal-optical coefficient materials, particularly liquid crystal (LC) and isopropanol, the sensitivity of fiber senser will be increased by an order of magnitude.

One of the most fundamental indicators for the temperature monitoring of various real-world application situations in the process of contemporary urbanization is stability. The scope of application and duration of use of the sensor are determined by iii the system’s reliability. Therefore, another chapter carefully explains how to increase system reliability by streamlining the system architecture. The doped fiber functioning as a gain, filter, and sensing element in the system rather than just a straightforward gain medium is designed.

Additionally, the optical spectrum analyzer (OSA) demodulation instrument is almost exclusively used in the conventional optical fiber temperature demodulation system, which has a high cost and a slow reaction speed. In order to make the most fully utilize of theoretical potential of sensors as possible, a novel demodulation scheme is required. As a result, a time-domain demodulation method based on timestretching that uses a dispersive fiber to map interference on the wavelength domain into time domain is proposed. Moreover, the precision of the system and temperature measurement is simultaneously improved by the deployment of a one-dimensional (1D) Convolutional neural network (CNN). The fiber laser temperature sensing system is at the center of the discussion, and thanks to improvements in three-dimensional: sensitivity, system simplification, and response time, fiber temperature sensors are now much more practical. The technology will be crucial in the nurturing of cell life, the monitoring of deep-sea temperatures, and the monitoring of body temperatures.

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