φ-OTDR vibration detection based on dual-channel sensing of a two-mode fiber

2021 ◽  
Author(s):  
Longtao Yang ◽  
Jiangjiang Gao ◽  
Zujun Qin
Keyword(s):  
Dual Channel ◽  
Vibration Detection ◽  
Channel Sensing

Binaphthyl-derived salicylidene Schiff base for dual-channel sensing of Cu, Zn cations and integrated molecular logic gates

2010 ◽  
Vol 145 (2) ◽  
pp. 826-831 ◽  
Author(s):  
Shichao Wang ◽  
Guangwen Men ◽  
Liyan Zhao ◽  
Qiufei Hou ◽  
Shimei Jiang
Keyword(s):  
Schiff Base ◽  
Logic Gates ◽  
Dual Channel ◽  
Molecular Logic ◽  
Molecular Logic Gates ◽  
Channel Sensing

Nanomolar-level selective dual channel sensing of Cu2+and CN−from an aqueous medium by an opto-electronic chemoreceptor

2018 ◽  
Vol 47 (4) ◽  
pp. 1082-1091 ◽  
Author(s):  
Suparna Paul ◽  
Pritam Ghosh ◽  
Samuzal Bhuyan ◽  
Subhra Kanti Mukhopadhyay ◽  
Priyabrata Banerjee
Keyword(s):  
Aqueous Medium ◽  
Molecular Electronics ◽  
Dual Channel ◽  
Channel Sensing

A novel chromogenic and fluorogenic chemoreceptor exhibiting a proclivity towards Cu2+and CN−, with applications in bioimaging and molecular electronics, was developed.

scholarly journals Dual-channel sensing by combining geometric and dynamic phases with an ultrathin metasurface

2020 ◽  
Vol 28 (19) ◽  
pp. 28612
Author(s):  
Qilong Tan ◽  
Hongchao Liu ◽  
Shuang Zhang
Keyword(s):  
Dual Channel ◽  
Channel Sensing

Dual-channel sensing of CO2: Reversible solution-gel transition and gelation-induced fluorescence enhancement

2018 ◽  
Vol 255 ◽  
pp. 2764-2778 ◽  
Author(s):  
Xin Zhang ◽  
Huifang Mu ◽  
Haimiao Li ◽  
Yu Zhang ◽  
Meng An ◽  
...  
Keyword(s):  
Fluorescence Enhancement ◽  
Dual Channel ◽  
Channel Sensing ◽  
Gel Transition

scholarly journals Optical and electrochemical dual channel sensing of Cu2+ using functionalized furo[2,3-d]pyrimidines-2,4[1H,3H]-diones

2017 ◽  
Vol 181 ◽  
pp. 73-81 ◽  
Author(s):  
Manoj Kumar ◽  
Lokesh Kumar Kumawat ◽  
Priyanka Bhatt ◽  
Anjali Jha ◽  
Shilpi Agarwal ◽  
...  
Keyword(s):  
Dual Channel ◽  
Channel Sensing

scholarly journals Vibration Detection Based on Multipath Information Fusion in Dual-Channel ϕ-OTDR System

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 20318-20330
Author(s):  
Zujun Qin ◽  
Jiangjiang Gao ◽  
Wangchun Zhu ◽  
Wentao Zhang
Keyword(s):  
Information Fusion ◽  
Dual Channel ◽  
Vibration Detection

Ferrocene-Based Small Molecules for Dual-Channel Sensing of Heavy- and Transition-Metal Cations

2008 ◽  
Vol 73 (14) ◽  
pp. 5489-5497 ◽  
Author(s):  
Antonio Caballero ◽  
Arturo Espinosa ◽  
Alberto Tárraga ◽  
Pedro Molina
Keyword(s):  
Transition Metal ◽  
Small Molecules ◽  
Metal Cations ◽  
Transition Metal Cations ◽  
Dual Channel ◽  
Channel Sensing

scholarly journals Monitoring Vehicles on Highway by Dual-Channel φ-OTDR

2020 ◽  
Vol 10 (5) ◽  
pp. 1839 ◽  
Author(s):  
Shaohua Xu ◽  
Zujun Qin ◽  
Wentao Zhang ◽  
Xianming Xiong
Keyword(s):  
Noise Suppression ◽  
Single Channel ◽  
Strong Dependence ◽  
Vibration Signal ◽  
Differential Method ◽  
Step Size ◽  
Distributed Sensor ◽  
Optical Time Domain Reflectometer ◽  
Dual Channel ◽  
Vibration Detection

As a fully distributed sensor, the phase-sensitive optical time domain reflectometer (φ-OTDR) has attracted remarkable attention in real-time vibration detection. We present a dual-channel φ-OTDR (DC-φ-OTDR), formed by two single-channel φ-OTDRs (SC-φ-OTDR), to monitor running vehicles on a highway. In the double-channel system, an improved algorithm (will be referred to as the CDM&V) is proposed to alleviate the strong dependence of vibration detection on the differential step as in the widely used conventional differential method (CDM). The DC-φ-OTDR is first tested over campus road before applying it to locate moving vehicles on the highway. For comparison purposes, both the DC-φ-OTDR and SC-φ-OTDR are used to monitor the vehicles with respective signal processing methods of the CDM and CDM&V. The experimental results at campus show that the dual-path scheme can undoubtedly reduce vibration misjudgment relative to the single one due to the very small possibility of false measurements occurred simultaneously at the same location in both channels. In signal demodulation, the CDM&V greatly relaxes the constraints on the differencing interval for identifying the vehicle-caused vibration. With a step size of 5 or lower, the CDM fails to locate the running vehicle at z=~8.5 km, but the CDM&V successfully demonstrates the feasible capability of locating the vibration. With an increase in the differential interval, both the CDM and CDM&V are able to detect the vibration signal, but with the latter showing a much better noise suppression performance and hence a larger SNR. Importantly, in comparison with the SC-φ-OTDR system, the DC-φ-OTDR exhibits a considerable enhanced SNR for the detection signal regardless of which processing algorithm (i.e., CDM, CDM&V) is used. The vehicle locations positioned by the DC-φ-OTDR are confirmed by the monitoring cameras.

Integrated dual-channel sensing utilizing polarized dissimilation based on photonic spin-orbit interaction

2019 ◽  
Vol 44 (15) ◽  
pp. 3757 ◽  
Author(s):  
Xuguang Huang ◽  
Xiaoting Ou ◽  
Zhilie Tang ◽  
Hong-Chao Liu ◽  
Qilong Tan
Keyword(s):  
Orbit Interaction ◽  
Spin Orbit ◽  
Spin Orbit Interaction ◽  
Dual Channel ◽  
Channel Sensing
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