Miniaturized fiber taper reflective interferometer for high temperature measurement.
We present an ultra-small all-silica high temperature sensor based on a reflective Fabry-Perot modal interferometer (FPMI). Our FPMI is made of a micro-cavity (approximately 4.4 microm) directly fabricated into a fiber taper probe less than 10 mum in diameter. Its sensing head is a miniaturized single mode-multimode fiber configuration without splicing. The sensing mechanism of FPMI is the interference among reflected fundamental mode and excited high-order modes at the end-faces. Its temperature sensitivity is approximately 20 pm/degrees C near the wavelength of 1550 nm. This kind of sensor can work in harsh environments with ultra-large temperature gradient, but takes up little space because of its unique geometry and small size.
Kou
Jun-long
JL
College of Engineering and Applied Sciences and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, China.
Feng
Jing
J
Ye
Liang
L
Xu
Fei
F
Lu
Yan-qing
YQ
D000535:Aluminum; D005336:Fiber Optic Technology / Q000295:instrumentation*; D006358:Hot Temperature; D007368:Interferometry / Q000295:instrumentation*; D008904:Miniaturization / Q000295:instrumentation*; D008962:Models, Theoretical; D055100:Optical Fibers; D012822:Silicon Dioxide
D012822:Silicon Dioxide; D000535:Aluminum