Multimode Fiber And Sapphire Fiber Fabry Perot Sensor Research

The emerging fiber-optic sensors represent a development trend of new generation sensor, with many advantages, such as simple structure, small size, light weight, free from electromagnetic interference, good stability, high accuracy, easy networking and so on, has been widely applied to industrial and military fields including energy, transportation, architecture, medicine, aerospace etc. Fiber optic sensor industry has been recognized as the most promising one of high-tech industry at home and abroad, and attracted worldwide attention due to its high content of science and technology, good economic returns, penetration ability, and broad market prospects etc. With China's rapid economic development and advancement of the internet of things development strategy, China's optical fiber sensor research and industrialization are also facing great opportunities and challenges. The fiber Fabry-Perot sensor is an important branch of optical fiber sensors, which mainly uses intensity demodulation and phase demodulation. The traditional single-wavelength intensity demodulation method is vulnerable to be affected by fluctuations in light intensity, optical path disturbance, optical fiber transmission loss changes, and the electrical parameter drift etc., making it less practical engineering application, generally only in the laboratory do some research and the like attempt. Therefore, to improve and perfect the fiber Fabry-Perot sensor production and demodulation method has a profound theoretical and practical significance. Based on this starting point, this paper completes a series of work, summarized as follows:(1) Referencing a large number of documents and patents, this paper analyzed domestic and foreign research status and development trends on optical fiber sensor to provide some reference for fiber optic sensor research and industrialization, at the same time summed up the current fiber optic sensor various structures, manufacturing method, demodulation method, and analyzed and compared their advantages and disadvantages.(2) Proposed the use of 157nm laser micromachining produced multimode fiber Fabry-Perot sensor and the pure silica fiber Fabry-Perot sensor, The experiment on the temperature and strain performance of multi-mode fiber Fabry-Perot sensor indicates that the sensor has excellent temperature and strain characteristics by using the 157nm laser micromachining produced multi-mode fiber Fabry-Perot sensor and the pure silica fiber Fabry-Perot sensor; meanwhile, the experiment concludes that this system can still conduct sensor measurements within 1000℃high temperature after pure silica fiber Fabry Perot sensor was tested in 1000℃high temperature.(3) The experiment researches the application of 157nm laser micromachining of sapphire fiber Fabry Perot temperature and pressure sensors. It develops a fiber sensing system to work in 1100℃or higher temperature in light of sapphire's heat-resistant characteristics; further more, the research provides an effective way to sense in harsh environments, like high temperature and pressure based on the studies concerning sapphire fiber pressure sensor.