نتایج جستجو برای: fiber optic chemical sensor

تعداد نتایج: 712100  

2014
Wenjuan Zeng Haibo Gao

The growth of the Internet of Things (IOT) industry has become a new mark of the communication domain. As the development of the technology of the IOT and the fiber-optical sensor, the combination of the both is a big question to be discussed, and the fiber-optical IOT also has a good development prospect. This article first introduces IOT’s current status, the key technology, the theoretical f...

Journal: :Optics express 2009
Bobo Gu Ming-Jie Yin A Ping Zhang Jin-Wen Qian Sailing He

A new fiber-optic pH sensor based on a thin-core fiber modal interferometer with electrostatic self-assembled nanocoating is presented. After inserting a segment of thin-core fiber into a standard single-mode fiber, high-order cladding modes are excited and interfere with the core mode to form an in-fiber modal interferometer. The side surface of the sensor is then deposited with poly(allylamin...

2014
Adolfo J. Rodríguez Carlos R. Zamarreño Ignacio R. Matías Francisco J. Arregui Rene F. Domínguez Cruz Daniel A. May-Arrioja

A universal pH indicator is used to fabricate a fiber optic ammonia sensor. The advantage of this pH indicator is that it exhibits sensitivity to ammonia over a broad wavelength range. This provides a differential response, with a valley around 500 nm and a peak around 650 nm, which allows us to perform ratiometric measurements. The ratiometric measurements provide not only an enhanced signal, ...

2008
A K Sharma G J Mohr

In the present work, a detailed theoretical analysis of a surface plasmon resonance (SPR)-based fiber optic sensor with an alternating dielectric multilayer system is carried out. The dielectric system consists of silica and titanium oxide layers. The effect of critical design parameters on the sensor’s sensitivity and detection accuracy is studied. The results are explained in terms of appropr...

2009
Hasan Seckin Efendioglu Tülay Yildirim Kemal Fidanboylu

Artificial neural network (ANN) based prediction of the response of a microbend fiber optic sensor is presented. To the best of our knowledge no similar work has been previously reported in the literature. Parallel corrugated plates with three deformation cycles, 6 mm thickness of the spacer material and 16 mm mechanical periodicity between deformations were used in the microbend sensor. Multil...

2011
Wook Jae Yoo Kyoung Won Jang Jeong Ki Seo Jinsoo Moon Ki-Tek Han Jang-Yeon Park Byung Gi Park Bongsoo Lee

A 2-channel embedded infrared fiber-optic temperature sensor was fabricated using two identical silver halide optical fibers for accurate thermometry without complicated calibration processes. In this study, we measured the output voltages of signal and reference probes according to temperature variation over a temperature range from 25 to 225 °C. To decide the temperature of the water, the dif...

Journal: :Optics express 2015
Duanni Huang Sudharsanan Srinivasan John E Bowers

A highly sensitive fiber optic current sensor using terbium doped fiber is presented. The Verdet constant of the terbium doped fiber at 1300nm is found to be 19.5μrad/A using both a polarimetric and interferometric type sensor. Measurements on a Sagnac-loop sensor using 10cm of terbium doped fiber placed inside a solenoid show over 40dB of open loop dynamic range as well as a minimum detectable...

2012
Tae-Sik Cho Ki-Sun Choi Dae-Cheol Seo Il-Bum Kwon Jung-Ryul Lee

The use of a fiber optic quasi-distributed sensing technique for detecting the location and severity of water leakage is suggested. A novel fiber optic sensor probe is devised with a vessel of water absorption material called as water combination soil (WCS) located between two highly reflected connectors: one is a reference connector and the other is a sensing connector. In this study, the sens...

2006
Juncheng Xu Ira Jacobs Ahmad Safaai-Jazi Yilu Liu Gary R. Pickrell Guy J Indebetouw

(Abstract) Pressure measurements are required in various industrial applications, including extremely harsh environments such as turbine engines, power plants and material-processing systems. Conventional sensors are often difficult to apply due to the high temperatures, highly corrosive agents or electromagnetic interference (EMI) noise that may be present in those environments. Fiber optic pr...

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