Novel Fiber-Optic Sensing System for Detection of Methane

2013 ◽  
Vol 562-565 ◽  
pp. 1008-1015 ◽  
Author(s):  
Shu Tao Wang ◽  
Peng Wei Zhang ◽  
Quan Min Zhu
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Step Motor ◽  
Harmonic Detection ◽  
Distributed Feedback Laser ◽  
Gas Cell ◽  
Response Characteristics ◽  
The Stability ◽  
Application Fields ◽  
Methane Detection

Based on DFBLD (Distributed Feedback Laser Diode) and harmonic detection technique, a novel fiber-optic methane detection system is constructed. The system can be applied to broad-range concentration detection of methane. Based on the approximation express of the law of Beer-Lambert, detection of methane with various concentration from 0% to 20% is completed using subtraction of background and ratio processing method, as the atmosphere surroundings are treated as background noise. The direct absorption spectra for various concentration is measured using GRIN gas cell, combined with DFBLD. The R5 line of the 2v3 band of methane is selected as the absorption peak. The system is tested online during gas mixing process and the linear relationship between system indication and concentration variation is validated. Also the stability and dynamic response characteristics are confirmed by the experiments. The sensitivity of the system can be adjusted according to the concentration level of various field environments by changing the prism distance using step motor. In the range of 0% to 20% the sensitivity of methane detection can arrive at 0.001%. So the system can be applied to various application fields and adopted as monitoring instruments for coalmine tunnel and natural pipeline.

Pressure-dependent sensitivity of a single-pass methane detection system using a continuous-wave distributed feedback laser at 3270  nm

2019 ◽  
Vol 58 (25) ◽  
pp. 6906 ◽  
Author(s):  
Seyed Ghasem Razavipour ◽  
James A. Gupta ◽  
Graeme Sabiston ◽  
Nicaulas Sabourin ◽  
Andrew Bezinger ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Detection System ◽  
Distributed Feedback ◽  
Distributed Feedback Laser ◽  
Single Pass ◽  
Methane Detection

Research on fiber-optic sensors for methane detection based on Harmonic detection

2010 ◽  
Author(s):  
Shutao Wang ◽  
Liang Huang ◽  
Zhishuang Zhou ◽  
Zhihui Zhu
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensors ◽  
Harmonic Detection ◽  
Methane Detection

Dryer Effluent Monitoring in a Chemical Pilot Plant via Fiber-Optic Near-Infrared Spectroscopy

1998 ◽  
Vol 52 (5) ◽  
pp. 717-724 ◽  
Author(s):  
Charity Coffey ◽  
Alex Predoehl ◽  
Dwight S. Walker
Keyword(s):  
Real Time ◽  
Pilot Plant ◽  
Near Infrared ◽  
Fiber Optic ◽  
Tunable Filter ◽  
Calibration Model ◽  
Gas Cell ◽  
Rotary Dryer ◽  
Vapor Stream ◽  
Effluent Stream

The monitoring of the effluent of a rotary dryer has been developed and implemented. The vapor stream between the dryer and the vacuum is monitored in real time by a process fiber-optic coupled near-infrared (NIR) spectrometer. A partial least-squares (PLS) calibration model was developed on the basis of solvents typically used in a chemical pilot plant and uploaded to an acousto-optic tunable filter NIR (AOTF-NIR). The AOTF-NIR is well suited to process monitoring as it electrically scans a crystal and hence has no moving parts. The AOTF-NIR continuously fits the PLS model to the currently collected spectrum. The returned values can be used to follow the drying process and determine when the material can be unloaded from the dryer. The effluent stream was monitored by placing a gas cell in-line with the vapor stream. The gas cell is fiber-optic coupled to a NIR instrument located 20 m away. The results indicate that the percent vapor in the effluent stream can be monitored in real time and thus be used to determine when the product is free of solvent.

Application of distributed fiber optic sensing in mine for methane detection

1996 ◽  
Author(s):  
Hong-Tao Jiang ◽  
Yi-Wei Shi ◽  
Zhaohui Wang ◽  
Yao-Cai Wang
Keyword(s):  
Fiber Optic ◽  
Fiber Optic Sensing ◽  
Methane Detection

scholarly journals Early diagnosis of Lung Cancer with Probability of Malignancy Calculation and Automatic Segmentation of Lung CT scan Images

2020 ◽  
Vol 2 (4) ◽  
pp. 175-186
Author(s):  
Dr. Samuel Manoharan ◽  
Sathish
Keyword(s):  
Detection System ◽  
Automatic Segmentation ◽  
Pulmonary Nodules ◽  
Automated Image Analysis ◽  
Computer Aided Detection ◽  
Response Characteristics ◽  
Proposed Model ◽  
Neural Classifier ◽  
Diagnosis Of Lung Cancer ◽  
Lung Ct

Computer aided detection system was developed to identify the pulmonary nodules to diagnose the cancer cells. Main aim of this research enables an automated image analysis and malignancy calculation through data and CPU infrastructure. Our proposed algorithm has improvement filter to enhance the imported images and for nodule selection and neural classifier for false reduction. The proposed model is experimented in both internal and external nodules and the obtained results are shown as response characteristics curves.

Fiber Optic Delivery And Detection System For HpD Photodynamic Therapy

1984 ◽  
Author(s):  
Daniel R. Doiron ◽  
Gregory S. Keller ◽  
A. E. Profio ◽  
Stanley W. Fountain
Keyword(s):  
Photodynamic Therapy ◽  
Fiber Optic ◽  
Detection System

Sinusoidal AC-induced electrohydrodynamic direct-writing nanofibers on insulating collector

2021 ◽  
pp. 2140009
Author(s):  
Huatan Chen ◽  
Guoyi Kang ◽  
Jiaxin Jiang ◽  
Juan Liu ◽  
Xiang Wang ◽  
...  
Keyword(s):  
Electric Field ◽  
Flexible Electronics ◽  
Direct Writing ◽  
Printing Process ◽  
Ac Electric Field ◽  
Jet Printing ◽  
Voltage Frequency ◽  
Fiber Deposition ◽  
The Stability ◽  
Application Fields

Printing orderly patterns on the insulating collector is the key for the development and application of flexible electronics. However, electrospinning on the insulating collector still has the problem of unstable jet due to the charge accumulation. The alternating current (AC)-induced electrohydrodynamic direct-writing (EDW) technology is a good way to decrease the interferences of charge repulsion, which is beneficial to printing orderly micro/nanostructures on the insulating collector. In this work, the sinusoidal AC-induced EDW is used to enhance the stability of charged jet and the deposition behaviors under AC electric field are also studied. The reciprocation transferring of charges induced by the AC electric field decreased the density of the accumulating charges on the insulating collector. The effect of AC electric field parameters on the direct-written micro/nanostructures are investigated to optimize the printing process. As the voltage peak increases, the fiber deposition bandwidth shows a trend of decreasing first and then increasing. Increasing the voltage frequency appropriately is beneficial to decrease the bandwidth of fiber deposition and to increase the stability of the jet. By improving the stability and controllability of the jet printing process, precise micro/nanopatterns can be direct-written on the insulating collector. This research provides a good foundation for expanding the application fields of EDW.

COD detection system of full spectrum based on fiber-optic sensing

2015 ◽  
Vol 41 (3) ◽  
pp. 229-232
Author(s):  
沈建华 SHEN Jianhua ◽  
许键 XU Jian ◽  
黄杰 HUANG Jie ◽  
李本冲 LI Benchong ◽  
杨馥瑞 YANG Furui
Keyword(s):  
Fiber Optic ◽  
Detection System ◽  
Full Spectrum ◽  
Fiber Optic Sensing
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