Flexible lock-in detection system based on synchronized computer plug-in boards applied in sensitive diode-laser gas spectroscopy

2007 ◽  
Author(s):  
Mats Andersson ◽  
Linda Persson ◽  
Tomas Svensson ◽  
Marta Cassel-Engquist ◽  
Sune Svanberg
Keyword(s):  
Diode Laser ◽  
Detection System ◽  
Lock In

Weak Signal Detection System Based on Lock-in Amplifier Technology

2013 ◽  
Vol 389 ◽  
pp. 489-493
Author(s):  
Yong Lv ◽  
Chun Hui Niu ◽  
Yue Qiang Li ◽  
Qing Shan Chen ◽  
Xiao Ying Li ◽  
...  
Keyword(s):  
Signal Detection ◽  
Detection System ◽  
Signal To Noise Ratio ◽  
Weak Signal ◽  
Weak Signal Detection ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Phase Sensitive ◽  
Lock In

In order to detect the weak signal deeply buried in the noise, a weak signal detection system based on lock-in amplifier is proposed. The system includes the preamplifier circuit, active low pass filter circuit, AC amplifying circuit and phase sensitive demodulation circuit. Test results show that it can greatly increase the signal-to-noise ratio (SNR) up to 12.7db.

Optimization of Harmonic Detection System for Tunable Diode Laser Absorption Spectroscopy Based on Mathematical Algorithm

2018 ◽  
Vol 13 (10) ◽  
pp. 1533-1542 ◽  
Author(s):  
Danni Shen ◽  
Anji Yu
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Detection System ◽  
Rapid Development ◽  
Noise Removal ◽  
Tunable Diode Laser ◽  
Gas Detection ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption ◽  
Diode Laser Absorption

Traditional gas detection technology has a certain degree of defects in all aspects, and it has not been able to adapt to the rapid development trend. Tunable diode laser absorption spectroscopy (TDLAS) technology has some good performance and is gradually being used in various industries. First, a gas detection instrument is designed. Then, based on subsequent data processing techniques, a wavelet transform algorithm is proposed, and the noise removal and baseline correction functions of the detection system are implemented. The results show that the proposed method has good removal effect on the inherent noise of the system and high efficiency. During the selection of the absorption line, the selected line of some gases cannot avoid the interference of adjacent peaks. Therefore, a mathematical analysis method of differential fold back algorithm is proposed. The absorption peak shape is squeezed by the method of adjacent phase subtraction and displacement superposition. The problem is solved well, and the accuracy of concentration measurement of some gases is effectively improved.

Diode Laser Based Photoacoustic Water Vapor Detection System for Atmospheric Research

2004 ◽  
Vol 58 (7) ◽  
pp. 792-798 ◽  
Author(s):  
Miklós Szakáll ◽  
Zoltán Bozóki ◽  
Árpád Mohácsi ◽  
Attila Varga ◽  
Gábor Szabó
Keyword(s):  
Water Vapor ◽  
Diode Laser ◽  
Detection System ◽  
Vapor Detection ◽  
Atmospheric Research ◽  
Water Vapor Detection

scholarly journals An FPGA-based lock-in detection system to enable Chemical Species Tomography using TDLAS

2015 ◽  
Author(s):  
Andrea Chighine ◽  
Edward Fisher ◽  
David Wilson ◽  
Michael Lengden ◽  
Walter Johnstone ◽  
...  
Keyword(s):  
Detection System ◽  
Chemical Species ◽  
Lock In

scholarly journals Flexible lock-in detection system based on synchronized computer plug-in boards applied in sensitive gas spectroscopy

2007 ◽  
Vol 78 (11) ◽  
pp. 113107 ◽  
Author(s):  
Mats Andersson ◽  
Linda Persson ◽  
Tomas Svensson ◽  
Sune Svanberg
Keyword(s):  
Detection System ◽  
Lock In

scholarly journals Development of a Photoacoustic Gas Detection System with a Near-Infrared Diode Laser.

2002 ◽  
Vol 30 (4) ◽  
pp. 193-197
Author(s):  
Shigeki TOKITA ◽  
Hideaki NIKI ◽  
Iwao KITAZIMA
Keyword(s):  
Diode Laser ◽  
Near Infrared ◽  
Detection System ◽  
Gas Detection
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