Dr. Qi Wang Profile

Dr. Qi Wang

at Northeastern Univ

SPIE Involvement:

Author

Publications (2)

Proceedings Article | 25 October 2017 Paper

A glucose concentration and temperature sensor based on long period fiber gratings induced by electric-arc discharge

Chao Du, Qi Wang

Proceedings Volume 10464, 104642G (2017) https://doi.org/10.1117/12.2285534

KEYWORDS: Glucose, Temperature sensors, Fiber optics sensors

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As one of the key parameters in biological and chemical reactions, glucose concentration objectively reflects the characteristics of reactions, so the real-time monitoring of glucose concentration is important in the field of biochemical. Meanwhile, the influence from temperature should be considered. The fiber sensors have been studied extensively for decades due to the advantages of small size, immunity to electromagnetic interference and high sensitivity, which are suitable for the application of biochemical sensing.

A long period fiber grating (LPFG) sensor induced by electric-arc discharge has been fabricated and demonstrated for simultaneous measurement of glucose concentration and temperature. The proposed sensor was fabricated by inscribing a sing mode fiber (SMF) with periodic electric-arc discharge technology. During the fabrication process, the electric-arc discharge technology was produced by a commercial fusion splicer, and the period of inscribed LPFG was determined by the movement of translation stages. A serials of periodic geometrical deformations would be formed in SMF after the fabrication, and the discharge intensity and discharge time can be adjusted though the fusion splicer settings screen. The core mode can be coupled into the cladding modes at certain wavelength when they satisfy the phase-matching conditions, and there will be several resonance dips in the transmission spectrum in LPFG. The resonance dips formed by the coupling between cladding modes and core mode have different sensitivity responses, so the simultaneous measurement for multi-parameter can be realized by monitoring the wavelength shifts of the resonance dips. Compared with the LPFG based on conventional SMF, the glucose concentration sensitivity has been obviously enhanced by etching the cladding with hydrofluoric acid solution. Based on the independent measured results, a dual-parameter measurement matrix has been built for signal demodulation. Because of the easy fabrication, low cost, small size and high sensitivity, the sensor is promising to be used for the biochemical sensing field where simultaneous measurement of glucose concentration and temperature is required.

SPIE Journal Paper | 28 December 2015

Visual quality inspection of capsule heads utilizing shape and gray information

Qi Wang, Tie Zhang, Zhenlin Cai, Nan Jiang, Jiamei Wu, Xiangde Zhang

JEI, Vol. 24, Issue 06, 061121, (December 2015) https://doi.org/10.1117/12.10.1117/1.JEI.24.6.061121

KEYWORDS: Head, Inspection, Optical inspection, Visualization, Image filtering, Binary data, Databases, Image enhancement, Feature extraction, High speed cameras

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Conference Committee Involvement (1)

Optic Fiber Gyro

25 July 2023 | Beijing, China

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