Continuously tunable frequency-doubled CO2-laser-based photoacoustic spectrometer for trace gas detection

2002 ◽  
Author(s):  
Albert Romann ◽  
Markus W. Sigrist
Keyword(s):  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Photoacoustic Spectrometer ◽  
Tunable Frequency

An all-optical photoacoustic spectrometer for trace gas detection

2011 ◽  
Vol 153 (1) ◽  
pp. 214-218 ◽  
Author(s):  
Qiaoyun Wang ◽  
Jianwei Wang ◽  
Liang Li ◽  
Qingxu Yu
Keyword(s):  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Photoacoustic Spectrometer ◽  
All Optical

Kinetics of Ethanol and Acetaldehyde Production in Fermenting Wheat Dough by Laser-Based Trace Gas Detection

2001 ◽  
Vol 7 (4) ◽  
pp. 307-315 ◽  
Author(s):  
S. Tomás ◽  
F. J. M. Harren
Keyword(s):  
Gas Detection ◽  
Trace Gas ◽  
Enzymatic System ◽  
Trace Gas Detection ◽  
Yeast Saccharomyces Cerevisiae ◽  
Wheat Dough ◽  
Photoacoustic Spectrometer ◽  
On Line ◽  
Active Dry Yeast ◽  
Acetaldehyde Production

The fermentation process of wheat dough was studied by laser-based trace gas detection. A CO-laser-driven photoacoustic spectrometer was used to monitor simultaneously, in real time, the ethanol and acetaldehyde production rates of two commercial types of active dry yeast ( Saccharomyces cerevisiae) in wheat dough substrates. Both types of yeast, Oand B, produced ethanol for 5 hours. Acetaldehyde was yielded only during 100 minutes by the yeast O, whereas the yeast Bgenerated this compound for 3.5 hours. The total ethanol and acetaldehyde productions amounted to 1.50 mL/g dough and 4.5 µ L/g dough in the Ocase, and 0.84 mL/g dough and 14.75 µ L/g dough, in the Bcase, respectively. The yeasts were also tested for their ability tometabolize mixes consisting of the control wheat dough substrate and extra amounts of glucose or maltose. Both types of yeasts showed a similar ability to consume the added glucose, however, only the yeast Bwas found to possess an adapted enzymatic system to metabolize maltose. This work showed the efficiency of applying photoacoustic trace gas detection to food technology research for on-line monitoring of fermenting wheat dough.

Ultra-High Sensitive Photoacoustic Spectrometer for Trace Gas Detection Based on Fiber-Optic Acoustic Sensors

2018 ◽  
Vol 38 (3) ◽  
pp. 0328015
Author(s):  
陈珂 Chen Ke ◽  
袁帅 Yuan Shuai ◽  
宫振峰 Gong Zhenfeng ◽  
于清旭 Yu Qingxu
Keyword(s):  
Fiber Optic ◽  
Gas Detection ◽  
Trace Gas ◽  
Acoustic Sensors ◽  
Trace Gas Detection ◽  
Photoacoustic Spectrometer

Miniature fiber-tip photoacoustic spectrometer for trace gas detection

2013 ◽  
Vol 38 (4) ◽  
pp. 434 ◽  
Author(s):  
Yingchun Cao ◽  
Wei Jin ◽  
Hoi Lut Ho ◽  
Jun Ma
Keyword(s):  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Photoacoustic Spectrometer

A photoacoustic spectrometer for trace gas detection

2005 ◽  
Vol 125 ◽  
pp. 885-888 ◽  
Author(s):  
E. M. Telles ◽  
E. Bezerra ◽  
A. Scalabrin
Keyword(s):  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Photoacoustic Spectrometer

An auto-correction laser photoacoustic spectrometer based on 2f/1f wavelength modulation spectroscopy

The Analyst ◽  
2020 ◽  
Vol 145 (4) ◽  
pp. 1524-1530 ◽  
Author(s):  
Ke Chen ◽  
Shuai Liu ◽  
Liang Mei ◽  
Feng Jin ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Measurement Errors ◽  
Wavelength Modulation Spectroscopy ◽  
Concentration Measurement ◽  
Gas Detection ◽  
Trace Gas ◽  
Wavelength Modulation ◽  
Trace Gas Detection ◽  
Light Power ◽  
Modulation Spectroscopy ◽  
Photoacoustic Spectrometer

An auto-correction laser photoacoustic (PA) spectrometer based on 2f/1f wavelength modulation spectroscopy (WMS) has been proposed and demonstrated for trace gas detection to eliminate concentration measurement errors due to light power variations.

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