Quartz enhanced photoacoustic spectroscopy with a 338 μm antimonide distributed feedback laser

2012 ◽  
Vol 37 (13) ◽  
pp. 2502 ◽  
Author(s):  
Mohammad Jahjah ◽  
Sofiane Belahsene ◽  
Lars Nähle ◽  
Marc Fischer ◽  
Johannes Koeth ◽  
...  
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Distributed Feedback ◽  
Distributed Feedback Laser

scholarly journals Dual Path Lock-In System for Elimination of Residual Amplitude Modulation and SNR Enhancement in Photoacoustic Spectroscopy

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4255 ◽  
Author(s):  
Qinduan Zhang ◽  
Jun Chang ◽  
Zhenhua Cong ◽  
Zongliang Wang ◽  
Fupeng Wang
Keyword(s):  
Amplitude Modulation ◽  
Photoacoustic Spectroscopy ◽  
Second Harmonic ◽  
Signal To Noise Ratio ◽  
Reference Signal ◽  
Distributed Feedback ◽  
Distributed Feedback Laser ◽  
Gas Concentration ◽  
Residual Amplitude Modulation ◽  
Lock In

A technique for elimination of residual amplitude modulation (ERAM) in photoacoustic spectroscopy based on dual path lock-in was proposed and experimentally demonstrated. There are two lock-in amplifiers, one is for gas concentration demodulation and another for residual amplitude modulation (RAM) measurement by tuning the reference signal in different phases, and then a dual path lock-in technique based on subtraction is applied to RAM removal, improving the second harmonic profile significantly. In this system, the signal to noise ratio (SNR) increases about two times based on our dual path lock-in technique compared to one distributed feedback laser diode (DFB-LD). The system achieved a good linear response (R-square = 0.99887) in a concentration range from 100 ppmv to 2400 ppmv and a minimum detection limit (MDL) of 1.47 ppmv.

scholarly journals Monolithic Double Resonator for Quartz Enhanced Photoacoustic Spectroscopy

2021 ◽  
Vol 11 (5) ◽  
pp. 2094
Author(s):  
Roman Rousseau ◽  
Diba Ayache ◽  
Nicolas Maurin ◽  
Wioletta Trzpil ◽  
Michael Bahriz ◽  
...  
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Distributed Feedback ◽  
Acoustic Excitation ◽  
Distributed Feedback Laser ◽  
Water Vapor Absorption ◽  
New Approach ◽  
Vapor Absorption ◽  
Printing Techniques

A new approach for Quartz Enhanced Photoacoustic Spectroscopy is presented, based on an acoustic excitation from the outside of the prongs of a quartz tuning fork, to increase the sensitivity of the sensor. For this purpose, we introduce a monolithic acoustic double-resonator (double-mR) in a T-shape configuration, using 3D printing. It was modelized and experimentally characterized using a 1392 nm distributed feedback laser diode, targeting a water vapor absorption line. The setup showed a two-factor enhancement of the signal, compared to a classical off-beam QEPAS approach and confirmed the strong interest of photolithographic printing techniques for acoustic developments.

1.5μm λ/4 shifted multiple quantum well distributed feedback laser diodes

1988 ◽  
Vol 24 (23) ◽  
pp. 1408 ◽  
Author(s):  
T. Sasaki ◽  
S. Takano ◽  
N. Henmi ◽  
H. Yamada ◽  
M. Kitamura ◽  
...  
Keyword(s):  
Quantum Well ◽  
Multiple Quantum Well ◽  
Laser Diodes ◽  
Distributed Feedback ◽  
Multiple Quantum ◽  
Distributed Feedback Laser
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