scholarly journals Design of modulation frequency regulator to optimize the green laser photoacoustic spectroscopy

2019 ◽  
Author(s):  
Frida Agung Rakhmadi ◽  
Mitrayana ◽  
Muhammad Alif Alifin
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Modulation Frequency ◽  
Green Laser ◽  
Laser Photoacoustic Spectroscopy

scholarly journals Design of Data Acquisition System for Green Laser Photoacoustic Spectroscopy Using Audacity Software

2019 ◽  
Vol 2 ◽  
pp. 93-95
Author(s):  
Frida Agung Rakhmadi ◽  
Mitrayana Mitrayana ◽  
Gilang Kurniawan Dian Pangestu
Keyword(s):  
Data Acquisition ◽  
Photoacoustic Spectroscopy ◽  
Wood Sample ◽  
Modulation Frequency ◽  
Data Acquisition System ◽  
Green Laser ◽  
Acquisition System ◽  
Data Recording ◽  
Signal Detector ◽  
Laser Photoacoustic Spectroscopy

Research on design of data acquisition system for green laser photoacoustic spectroscopy has been done. The purpose of this research was to create and test data acquisition system for green laser photoacoustic spectroscopy. The system was created with ATR 3350iS microphone as signal detector and audacity software as data recording and processing. The testing was conducted in four phases, firstly testing the system without laser, secondly testing the system with non-modulated laser, thirdly testing the system with modulated laser without a sample, and finally testing the system with modulated laser to wood sample. The result showed that there weren not any photoacoustic signals detected in condition of without laser and with non-modulated laser. Meanwhile, in the condition of modulated laser without sample and with the sample of wood, the data acquisition system detected photoacoustic signals in the range of laser modulation frequency was 1000 – 9981 Hz.

Simultaneous detection of ammonia, methane and ethylene at 1.63 μm with diode laser photoacoustic spectroscopy

2005 ◽  
Vol 82 (3) ◽  
pp. 495-500 ◽  
Author(s):  
M. Scotoni ◽  
A. Rossi ◽  
D. Bassi ◽  
R. Buffa ◽  
S. Iannotta ◽  
...  
Keyword(s):  
Diode Laser ◽  
Photoacoustic Spectroscopy ◽  
Simultaneous Detection ◽  
Laser Photoacoustic Spectroscopy

CO2-laser photoacoustic spectroscopy of deuterated ammonia

1997 ◽  
Vol 38 (6) ◽  
pp. 331-336 ◽  
Author(s):  
Ljubica T. Petkovska ◽  
Šćepan S. Miljanić
Keyword(s):  
Co2 Laser ◽  
Photoacoustic Spectroscopy ◽  
Laser Photoacoustic Spectroscopy

Depth Profile Study of Large-Sized Coal Samples by Fourier Transform Infrared Photoacoustic Spectroscopy

1986 ◽  
Vol 40 (2) ◽  
pp. 214-217 ◽  
Author(s):  
Tiziana Zerlia
Keyword(s):  
Fourier Transform ◽  
Depth Profile ◽  
Photoacoustic Spectroscopy ◽  
Modulation Frequency ◽  
Fourier Transform Infrared ◽  
Qualitative Description ◽  
Difference Spectra ◽  
Compositional Depth Profile ◽  
Ft Ir ◽  
Infrared Photoacoustic Spectroscopy

A multidisciplinary approach is demonstrated to elucidate coal weathering at a molecular level. Fourier Transform Infrared Photoacoustic Spectroscopy (FT-IR/PAS) provides a technique for a compositional depth profile of coal by simply varying the modulation frequency (mirror velocity) of the light impinging upon the solid surface. In order that the potential of this technique in this field could be evaluated, large-sized coal samples were examined. The PA difference spectra obtained from the spectra taken at different modulation frequencies (i.e., different depths), on a sample aged in air, demonstrate the appearance of negative features in the CH infrared absorption which are indicative of a coal alteration. Therefore, different coal layers can be distinguished by FT-IR/PAS. The application of the same technique to the study of a coal sample heated in air at 200°C allows the detection of different oxidation mechanisms operating inside and outside the coal. Although quantitative results are difficult to obtain, the technique can be successfully proposed for a qualitative description of coal weathering.

Study of Gas Exchange in Insects by Sensitive Laser Photoacoustic Spectroscopy

2006 ◽  
Vol 34 (1-2) ◽  
pp. 85-96
Author(s):  
S. T. Persijn ◽  
F. J. M. Harren ◽  
I. Wijkamp ◽  
L. Mitrayana
Keyword(s):  
Gas Exchange ◽  
Photoacoustic Spectroscopy ◽  
Laser Photoacoustic Spectroscopy
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