Two-tone frequency-modulation spectroscopy for low-absorption tomographic imaging

2005 ◽  
Author(s):  
P. Kauranen ◽  
H.M. Hertz ◽  
S. Svanberg
Keyword(s):  
Frequency Modulation ◽  
Tomographic Imaging ◽  
Tone Frequency ◽  
Modulation Spectroscopy

scholarly journals Recent Developments in Modulation Spectroscopy for Methane Detection Based on Tunable Diode Laser

2019 ◽  
Vol 9 (14) ◽  
pp. 2816 ◽  
Author(s):  
Fei Wang ◽  
Shuhai Jia ◽  
Yonglin Wang ◽  
Zhenhua Tang
Keyword(s):  
Semiconductor Lasers ◽  
Frequency Modulation ◽  
Near Infrared ◽  
Infrared Region ◽  
Tunable Diode Laser ◽  
Tone Frequency ◽  
Modulation Spectroscopy ◽  
Methane Absorption ◽  
Recent Developments ◽  
Methane Detection

In this review, methane absorption characteristics mainly in the near-infrared region and typical types of currently available semiconductor lasers are described. Wavelength modulation spectroscopy (WMS), frequency modulation spectroscopy (FMS), and two-tone frequency modulation spectroscopy (TTFMS), as major techniques in modulation spectroscopy, are presented in combination with the application of methane detection.

Measurement of high overtone intensities of HBr by two-tone frequency-modulation spectroscopy

1988 ◽  
Vol 130 (2) ◽  
pp. 395-406 ◽  
Author(s):  
C.B. Carlisle ◽  
H. Riris ◽  
L.G. Wang ◽  
G.R. Janik ◽  
T.F. Gallagher ◽  
...  
Keyword(s):  
Frequency Modulation ◽  
Tone Frequency ◽  
Modulation Spectroscopy ◽  
High Overtone

Two-tone frequency-modulation spectroscopy in off-axis cavity

2013 ◽  
Vol 38 (22) ◽  
pp. 4625 ◽  
Author(s):  
P. Malara ◽  
M. F. Witinski ◽  
G. Gagliardi ◽  
P. De Natale
Keyword(s):  
Frequency Modulation ◽  
Tone Frequency ◽  
Modulation Spectroscopy
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