Production Of Optical Fiber Fabry-perot Laser Micromachining High Temperature And Refractive Index Sensors

Measurement of refractive index and temperature are of great importance in the field of metallurgy, electricity, chemical industry, aerospace and so on. Optic Fiber Sensing technology was gained more and more attention because of its inherent advantages and had insurmountable competitiveness over electric sensors in these fields.This paper deals with the manufacture process and characteristics of laser processed and miniaturized fiber optic Fabry-Perot temperature sensors and phosgene Fabry-Perot refractive index sensors. And the research results will be summarized as follows.A novel miniature fiber-optic Fabry-Perot refractive-index sensor machined by 157nm laser is proposed. The sensor head consists of a micro air F-P cavity near the tip of a single-mode fiber and have a micro channel on the fiber tip. The micro channel is used as the entrance for liquid under test. Two thin films that are coated at reflective interfaces of the F-P cavity as mirrors are ensure high optical contrast, respectively. in experiment. A RI resolution of 1130.887nm/RI unit (RIU) is achieved. Such a sensor has a lot of outstanding advantages compared with other fiber-optic RI sensors, for example. very small, rigid, high resolution, excellent linearity, wide measurement range, et al. It is anticipated that this miniature sensor could meet the requirements for practical applications and find important applications in any case where small sensor size is essential, such as in biomedical diagnostic.Laser processed quartz fiber optic Fabry-Perot temperature sensors. A method manufacturing miniature fiber optic Fabry-Perot high-temperature sensors is provided. The sensor is manufactured by laser beam grooving one end of common single mode fiber and then welding the notch section to silicon single mode fiber. Fringes of the miniaturized fiber optic Fabry-Perot high-temperature sensor manufactured in the experiment are smooth and its contrast ratio achieves 25dB. The experiment of the temperature sensing on the sensor shows that from 40℃to 1100℃the sensitivity of the movement of the trough that changes with temperature is 14pm/℃, and the degree of linearity is 0.9969. The high-temperature sensor would be hard to be damaged after being packaged with metal capillary tube.Laser processed sapphire fiber optic Fabry-Perot temperature sensors. Here I utilize the method manufacturing miniaturized fiber optic Fabry-Perot temperature sensors:laser beam grooving one end of common single mode fiber and then welding . the notch section to silicon single mode fiber. The experiment of the temperature sensing on the sensor shows that from 40℃to 1100℃the sensitivity of the movement of the trough that changes with temperature is 16.7pm/℃, and the degree of linearity is 0.999.