An Infrared Absorption Gas Detection System Applying Plane Blazed Grating

2011 ◽  
Vol 233-235 ◽  
pp. 2665-2668 ◽  
Author(s):  
Hai Rong Wang ◽  
Di Cen ◽  
Guang Fei Men ◽  
Jian Yun Wang
Keyword(s):  
Infrared Absorption ◽  
Detection System ◽  
Coal Industry ◽  
Gas Detection ◽  
Blazed Grating ◽  
Detection Technology ◽  
Reliable Detection ◽  
Co Concentration ◽  
Novel Method ◽  
Efficient Option

Quick, accurate and reliable detection of mash gas plays an important role in the coal industry. This paper presents a novel method to get the infrared absorption peak wavelength by light splitting using plane blazed grating, instead of using filter conventionally. The principle and setup of producing 3.433μm and 4.65μm wavelength lights for detecting CH4 and CO concentration are described in details. The work provides a simple, but efficient option to the infrared absorption gas detection technology.

A Gas Detection System Based on the Micro Light Splitting Principle

2012 ◽  
Vol 542-543 ◽  
pp. 57-65 ◽  
Author(s):  
Hai Rong Wang ◽  
Wei Zhang ◽  
Di Cen ◽  
Min Tian
Keyword(s):  
Carbon Monoxide ◽  
Signal Processing ◽  
Infrared Absorption ◽  
Detection System ◽  
Maximum Error ◽  
Coal Industry ◽  
Experimental Results ◽  
Gas Detection ◽  
Schematic Diagram ◽  
Blazed Grating

This paper presents a novel system for detecting concentration of the CH4 and CO gases, which exist widely in the coal industry. The system applies micro blazed grating to split the collimated light and may get the infrared absorption light with certain wavelength and bandwidth for the gases detection. The schematic diagram, calculation, signal processing, and setup were described in details. Experimental results indicate that the detection system has the ability to detect methane and carbon monoxide with maximum error of 0.169% and 58.3ppm, stability of 0.76% and 0.22%, respectively.

scholarly journals RESEARCH ON METHANE LEAK DETECTION TECHNOLOGY BASED ON INFRARED ABSORPTION PRINCIPLE

2021 ◽  
Vol 5 (11) ◽  
Author(s):  
X.Y. Chen ◽  
Y Peng ◽  
Q. Miao ◽  
L Ge ◽  
X.Y Zheng ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Natural Gas ◽  
Infrared Absorption ◽  
Methane Concentration ◽  
Detection System ◽  
Clean Energy ◽  
Gas Concentration ◽  
Consumption Structure ◽  
Gas Leakage ◽  
Detection Technology

As a clean energy, natural gas accounts for an increasing proportion of my country's energy consumption structure. Due to the flammable and explosive characteristics of natural gas, natural gas leakage can easily cause safety accidents. This paper has designed a gas concentration detection system based on the principle of infrared absorption, which can detect the methane concentration in natural gas, quickly determine whether there is a methane leak, and effectively protect people's lives and property.

scholarly journals Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique

2019 ◽  
Vol 10 ◽  
pp. 2182-2191 ◽  
Author(s):  
Tushar C Jagadale ◽  
Dhanya S Murali ◽  
Shi-Wei Chu
Keyword(s):  
Laser Scanning ◽  
Detection System ◽  
Nonlinear Behavior ◽  
Optical Nonlinearity ◽  
Research Area ◽  
Confocal Laser Scanning Microscope ◽  
Confocal Laser ◽  
Thin Sample ◽  
Channel Detection ◽  
Novel Method

Nonlinear nanoplasmonics is a largely unexplored research area that paves the way for many exciting applications, such as nanolasers, nanoantennas, and nanomodulators. In the field of nonlinear nanoplasmonics, it is highly desirable to characterize the nonlinearity of the optical absorption and scattering of single nanostructures. Currently, the common method to quantify optical nonlinearity is the z-scan technique, which yields real and imaginary parts of the permittivity by moving a thin sample with a laser beam. However, z-scan typically works with thin films, and thus acquires nonlinear responses from ensembles of nanostructures, not from single ones. In this work, we present an x-scan technique that is based on a confocal laser scanning microscope equipped with forward and backward detectors. The two-channel detection offers the simultaneous quantification for the nonlinear behavior of scattering, absorption and total attenuation by a single nanostructure. At low excitation intensities, both scattering and absorption responses are linear, thus confirming the linearity of the detection system. At high excitation intensities, we found that the nonlinear response can be derived directly from the point spread function of the x-scan images. Exceptionally large nonlinearities of both scattering and absorption are unraveled simultaneously for the first time. The present study not only provides a novel method for characterizing nonlinearity of a single nanostructure, but also reports surprisingly large plasmonic nonlinearities.

Domestic gas detection system using two SnO2 integrated sensors

1994 ◽  
Vol 19 (1-3) ◽  
pp. 658-660 ◽  
Author(s):  
V. Demarne ◽  
B. Romanowicz ◽  
A. Grisel ◽  
J. Fournier
Keyword(s):  
Detection System ◽  
Gas Detection ◽  
Integrated Sensors

Optical Fiber CO Concentration Measurement Prism of the Gas Chamber Variable Optical Path Automatic Adjustment System Research

2011 ◽  
Vol 109 ◽  
pp. 237-243
Author(s):  
Hong Xiu Zhu ◽  
Hao Zheng ◽  
Hong Bo Zhang ◽  
Xin Wang ◽  
Bo Xi Yang ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Optical Fiber ◽  
Light Sensitivity ◽  
Concentration Measurement ◽  
Harmonic Detection ◽  
Feedback Type ◽  
Detection Technology ◽  
Co Concentration ◽  
Adjustment System ◽  
Gas Chamber

According to the absorption spectrum, combined with CO distribution feedback type laser diode (DFB-LD) light source, we selected R a center for 1567.3 nm as the wavelength of the absorption spectrum line. Comprehensively using of prism of gas chamber and harmonic detection technology, we constructed the optical fiber CO concentration measurement system. Through the stepping motor regulation height, it changes indoor prism gas effective absorption process, adjusts the light sensitivity system.

Study on Driver's Unsafe Gaze Behavior Detection Technology

2013 ◽  
Vol 427-429 ◽  
pp. 1903-1906
Author(s):  
Peng Wang ◽  
Zhi Qiang Liu
Keyword(s):  
Detection System ◽  
Characteristic Curve ◽  
Abnormal Behavior ◽  
Gaze Behavior ◽  
Source Information ◽  
Eyelid Closure ◽  
Behavior Detection ◽  
Detection Technology ◽  
Level Information ◽  
Behavior Characteristics

A system for detecting and evaluating drivers gaze behavior was proposed. A system for recognizing the drivers unsafe gaze behavior was established using multi-level information and fusion decision method as well. The driving environment and condition is complex as well as the gaze behavior characteristics, and given that, a solution consists of patten classification and the multi-information decision-level fusion were put forward to estimate the different kind model of the driver's gaze behavior. In order to test the proposed strategies,the real time driver's gaze behavior detection system was established. The T characteristic curve proposed through the abnormal behavior parameters of the transverse width between the eyes and the vertical distance between mouth and the midpoint of two eyes, combined with the driver's eyelid closure and the proportion and location characteristics of iris - sclera were studied to get the characterization of the drivers gaze status information. The simulation results indicate that the adaptability and accuracy as well as the intelligent level is significantly improved by using the pattern classification and decision-making technology through multi-source information fusion.

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