Research on SO2F2 gas detection in GIS combining interband cascade laser and second harmonic technology

2021 ◽  
Author(s):  
Jin Qian ◽  
Xiaobo Liu ◽  
Xianglian Yan ◽  
Qiang Yao ◽  
Shukai He ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Gas Detection ◽  
Interband Cascade Laser

scholarly journals The driver design for N2O gas detection system based on tunable interband cascade laser

2019 ◽  
Vol 78 ◽  
pp. 03002
Author(s):  
Lihuan Liao ◽  
Jingjing Zhang ◽  
Daming Dong
Keyword(s):  
Power Supply ◽  
High Efficiency ◽  
Detection System ◽  
Tunable Diode Laser ◽  
Circuit Board ◽  
Gas Detection ◽  
Electrolytic Capacitor ◽  
Negative Power ◽  
Interband Cascade Laser ◽  
Driver Circuit

In this paper, the driver circuit for N2O gas detection system based on tunable interband cascade laser (ICL) is developed. Considering the influence of power supply stability on the digital-analog hybrid drive circuit of tunable diode laser absorption spectroscopy (TDALS), the high-efficiency TPS5430 is used to design the positive and negative power supply circuit. The large electrolytic capacitor + post-stage LC filter combination filter is used to effectively filter out high and low frequency ripple and switching noise. The use of thick high current trace + via + multilayer printed circuit board (PCB) design makes the line temperature rise smaller, more stable and durable, and uses high frequency shielding inductance to effectively reduce radiation interference to ensure the stability of the drive. The STM32F407, a highperformance microcontroller based on the ARM Cortex-M4 core, is used as the master control chip and generates a sawtooth scanning signal. The direct digital synthesizer (DDS) chip ICL8038 is used to generate a sinusoidal modulated signal of a specific frequency. The two signals are superimposed by a reverse addition circuit, and the laser drive signal is generated by a developed positive feedback balanced voltagecurrent conversion circuit. Experimental results show that the driver circuit can well meet the drive development requirements of N2O gas detection systems based on tunable interband cascade laser.

scholarly journals A Trace C2H2 Sensor Based on an Absorption Spectrum Technique Using a Mid-Infrared Interband Cascade Laser

Micromachines ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 530 ◽  
Author(s):  
Ye Mu ◽  
Tianli Hu ◽  
He Gong ◽  
Ruiwen Ni ◽  
Shijun Li
Keyword(s):  
Absorption Spectroscopy ◽  
Second Harmonic ◽  
Harmonic Signal ◽  
Gas Absorption ◽  
Tunable Diode Laser ◽  
Integration Time ◽  
Detection Accuracy ◽  
Laser Absorption ◽  
Interband Cascade Laser ◽  
Diode Laser Absorption

In this study, tunable diode laser absorption spectroscopy (TDLAS) combined with wavelength modulation spectroscopy (WMS) was used to develop a trace C2H2 sensor based on the principle of gas absorption spectroscopy. The core of this sensor is an interband cascade laser that releases wavelength locks to the best absorption line of C2H2 at 3305 cm−1 (3026 nm) using a driving current and a working temperature control. As the detected result was influenced by 1/f noise caused by the laser or external environmental factors, the TDLAS-WMS technology was used to suppress the 1/f noise effectively, to obtain a better minimum detection limit (MDL) performance. The experimental results using C2H2 gas with five different concentrations show a good linear relationship between the peak value of the second harmonic signal and the gas concentration, with a linearity of 0.9987 and detection accuracy of 0.4%. In total, 1 ppmv of C2H2 gas sample was used for a 2 h observation experiment. The data show that the MDL is low as 1 ppbv at an integration time of 63 s. In addition, the sensor can be realized by changing the wavelength of the laser to detect a variety of gases, which shows the flexibility and practicability of the proposed sensor.

scholarly journals Analysis and Detection of a Target Gas System Based on TDLAS & LabVIEW

2019 ◽  
Vol 9 (3) ◽  
pp. 4196-4199 ◽  
Author(s):  
F. Alorifi ◽  
S. M. A. Ghaly ◽  
M. Y. Shalaby ◽  
M. A. Ali ◽  
M. O. Khan
Keyword(s):  
Absorption Spectrum ◽  
Second Harmonic ◽  
Detection System ◽  
Infrared Absorption Spectrum ◽  
Gas Absorption ◽  
Tunable Diode Laser ◽  
Gas Detection ◽  
Measured Signal ◽  
Gas Concentration ◽  
Detection Techniques

This paper introduces detection techniques of target gas concentration based on infrared absorption spectrum method and the simulation of the gas detection system using LabVIEW. In this work, the harmonic detection is performed by wavelength modulation technique with a related frequency signal to cover the measured signal and get the gas absorption coefficient that can be analysed to give a gas concentration. A series of simulations are carried out to scan weak absorption lines and extract the second harmonic curve of the absorption spectrum of the target gas. The absorption and second harmonic curves are acquired by changing the parameters of the target gas concentration and line width. This work claims to be a contribution to the study and the comprehension of gas detection system based on tunable diode laser absorption spectroscopy and can serve as a basis for practical data acquisition.

scholarly journals Second Harmonic Phase Angle Method Based on WMS for Background-Free Gas Detection

2021 ◽  
Vol 13 (5) ◽  
pp. 1-6
Author(s):  
Cunguang Zhu ◽  
Pengpeng Wang ◽  
Tongwei Chu ◽  
Feng Peng ◽  
Yongjie Sun
Keyword(s):  
Phase Angle ◽  
Second Harmonic ◽  
Gas Detection ◽  
Free Gas ◽  
Harmonic Phase ◽  
Angle Method

Giant increase of the second harmonic radiation's absorption during optical poling of oxide glass

2003 ◽  
Vol 50 (8) ◽  
pp. 1237-1244 ◽  
Author(s):  
M. K. Balakirev ◽  
V. A. Smirnov ◽  
L. I. Vostrikova ◽  
I. V. Kityk ◽  
J. Kasperczyk ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Oxide Glass

Test of directional photoionisation models of second harmonic generation in optical fibres

1992 ◽  
Vol 139 (2) ◽  
pp. 133 ◽  
Author(s):  
N.M. Lawandy ◽  
T.J. Driscoll ◽  
C.L. Adler ◽  
N.M. Lawandy
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Optical Fibres
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