Journal ArticleDOI
Application of strongly overcoupled resonant modes of long-period fiber gratings to measure the adulteration of olive oil
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TLDR
The response characteristics of strongly overcoupled resonant modes of different orders to a surrounding medium, the refractive index (RI) of which is greater than that of the fiber cladding, and in the range where a preciseRefractive index measurement is immensely useful for inspecting the quality of olive oils and other edible oils are investigated.Abstract:
We have shown that strongly overcoupled resonant modes of long-period fiber gratings (LPFGs) can be used to assess the adulteration of olive oil. In this background, we investigate the response characteristics of strongly overcoupled resonant modes of different orders to a surrounding medium, the refractive index (RI) of which is greater than that of the fiber cladding, and in the range where a precise refractive index measurement is immensely useful for inspecting the quality of olive oils and other edible oils. A theoretical simulation that would help in designing a sensor with suitable sensitivity and range of measurement has been presented in detail and also validated with experimental results. It was interesting to observe that in a high RI surrounding, a lower order overcoupled resonant mode is much more sensitive as compared to a higher-order one having a similar coupling coefficient. A quantitative analysis demonstrates that for a particular LPFG, the sensitivity of a strongly overcoupled LP06 mode was found to be ∼2000 dB/RIU, while that of the LP07 mode having similar coupling strength was ∼550 dB/RIU in the surrounding refractive index range from 1.458 to 1.520. The results have been validated experimentally.read more
Citations
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Proceedings ArticleDOI
Sensitivity characteristics of long-period fiber gratings
TL;DR: In this article, the sensitivity of long-period fiber gratings as a function of processed parameters by high-frequency CO 2 laser pulses has been investigated and a theoretical and experimental investigation has been conducted.
Journal ArticleDOI
Design, fabrication and characterisation of silica-titania thin film coated over coupled long period fibre gratings: Towards bio-sensing applications
Palas Biswas,Francesco Chiavaioli,Sunirmal Jana,Nandini Basumallick,Cosimo Trono,Ambra Giannetti,Sara Tombelli,Aparajita Mallick,Francesco Baldini,Somnath Bandyopadhyay +9 more
TL;DR: In this paper, the authors report on the application of over coupled long period fiber gratings (OCLPFGs) for detecting small changes in the surrounding refractive index (SRI), and the optimization of a high RI overlay deposited over the fiber for the adhesion of biological species is described.
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New method for effective identification of adulterated Camellia oil basing on Camellia oleifera-specific DNA
Xuexiang Cheng,Xuexiang Cheng,Tao Yang,Yunhao Wang,Bingqian Zhou,Li Yan,Linzuo Teng,Fangbin Wang,Lili Chen,Yan He,Guo Kunpeng,Dangquan Zhang,Dangquan Zhang +12 more
TL;DR: In this paper, a complete identification system of Camellia oil adulteration was firstly established basing on the specific DNA of camellia oleifera, and it may provide a new idea and method for identification of adulterated Camella oil.
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Mini review: Recent advances in long period fiber grating biological and chemical sensors
Xin-Wu Zhao,Qi Wang +1 more
TL;DR: In this paper, an important member of the optical fiber sensor family, long period fiber gratings (LPFGs) have attracted increased attention due to their outstanding characteristics, and the LPFG is a transmission medium.
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A Fiber Optic Fabry–Perot Cavity Sensor for the Probing of Oily Samples
TL;DR: In this article, a micro-optical Fabry-Perot cavity fabricated by nonlinear laser lithography on the endface of a standard telecom fiber is tested as a microsensor for identifying oily liquids.
References
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TL;DR: A novel class of highly sensitive sensors based on long-period fiber gratings that can be implemented with simple and inexpensive demodulation schemes are presented.
Journal ArticleDOI
Cladding-mode resonances in short- and long-period fiber grating filters
TL;DR: In this article, the transmission of a mode guided by the core of an optical fiber through an ultraviolet-induced fiber grating when substantial coupling to cladding modes occurs is analyzed both experimentally and theoretically.
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Analysis of the response of long period fiber gratings to external index of refraction
TL;DR: In this article, the authors demonstrate that the change in wavelength of a long period fiber grating attenuation band with changes in external index of refraction can be enhanced by proper selection of the grating period.
Journal ArticleDOI
Sensitivity characteristics of long-period fiber gratings
Xuewen Shu,Lin Zhang,Ian Bennion +2 more
TL;DR: In this paper, the sensitivity of long-period fiber gratings (LPFGs) is investigated as a function of temperature, strain, and surrounding refractive index, with particular attention to the higher order cladding modes and the possibilities for ultrasensitive sensors.
Journal ArticleDOI
Optimization of sensitivity in Long Period Fiber Gratings with overlay deposition.
TL;DR: The deposition of an overlay of higher refractive index than the cladding in a Long Period Fiber Grating permits to improve the sensitivity to ambient refractiveIndex changes in a great manner, and henceforward fast shifts of the resonance wavelength of the attenuations bands in the transmission spectrum are studied.
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