scholarly journals Digital signal processor-based high-precision on-line Voigt lineshape fitting for direct absorption spectroscopy

2014 ◽  
Vol 85 (12) ◽  
pp. 123108 ◽  
Author(s):  
Lijun Xu ◽  
Chang Liu ◽  
Deyan Zheng ◽  
Zhang Cao ◽  
Weiwei Cai
Keyword(s):  
High Precision ◽  
Absorption Spectroscopy ◽  
Digital Signal Processor ◽  
Digital Signal ◽  
Direct Absorption ◽  
Direct Absorption Spectroscopy ◽  
On Line ◽  
Signal Processor

High Voltage Driver for RSFQ Digital Signal Processor

2007 ◽  
Vol 17 (2) ◽  
pp. 470-473 ◽  
Author(s):  
Igor I. Soloviev ◽  
M. Raihan Rafique ◽  
Henrik Engseth ◽  
Anna Kidiyarova-Shevchenko
Keyword(s):  
High Voltage ◽  
Digital Signal Processor ◽  
Digital Signal ◽  
Signal Processor

A constant intensity technique to improve the performances of devices based on direct absorption spectroscopy

2015 ◽  
Vol 23 (1) ◽  
Author(s):  
A. Montori ◽  
M. De Pas ◽  
M. Giuntini ◽  
M. Siciliani De Cumis ◽  
S. Viciani ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Direct Absorption ◽  
Background Signal ◽  
Constant Intensity ◽  
Gas Concentration ◽  
Direct Absorption Spectroscopy ◽  
Frequency Scan ◽  
Time Observation ◽  
Detection Processing ◽  
Real Time Observation

Abstract We describe an all−in−fibre apparatus for Constant Intensity Direct Absorption Spectroscopy (CIDAS) for gas concentration measurements which keeps the power of a diode laser constant along the frequency sweep. The reduction of the large variation of the laser power, connected to the frequency scan, enhances the ability of detecting small variations in a background signal, resulting in an increase of the sensitivity with respect to standard direct absorption techniques. Moreover, CIDAS allows for a real−time observation of the absorption signals without any kind of post−detection processing. The apparatus has been tested with carbon dioxide (CO

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