OSU Navigation Bar

The Ohio State University University Libraries Knowledge Bank

The Knowledge Bank is scheduled for regular maintenance on Sunday, April 20th, 8:00 am to 12:00 pm EDT. During this time users will not be able to register, login, or submit content.

PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/38240

Show full item record

Files Size Format View
abstract.gif 17.68Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
HovdePseudoRandom.ppt 645.5Kb Microsoft PowerPoint View/Open
Slide1.GIF 41.61Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide2.GIF 58.83Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide3.GIF 22.57Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide4.GIF 13.99Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide5.GIF 16.90Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide6.GIF 30.90Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide7.GIF 15.46Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide8.GIF 34.91Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide9.GIF 15.04Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide10.GIF 18.84Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide11.GIF 8.678Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Slide12.GIF 7.728Kb GIF image Thumbnail of PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION

Title: PSEUDO-RANDOM AMPLITUDE OR TONE BURST MODULATION COMBINED WITH CAVITY-ENHANCED DETECTION
Creators: Hovde, Chris; Massick, Steve M.; Bomse, David S.
Issue Date: 2009
Abstract: Combining pseudo random-modulation techniques with cavity enhanced spectroscopy allows the estimation of both optical path length and absorption while using a cw diode laser as the light source. Two pseudo-random modulation approaches are described, in each case combined with an off-axis cavity consisting of two cylindrical mirrors oriented to produce a dense pattern of cavity modes. In one approach, the amplitude of the laser is modulated; deconvolution results in an exponential ring-down decay curve. In the second approach, tone bursts that modulate the laser frequency are switched on and off with a pseudo-random code. Deconvolution yields the first derivative of an exponential whose amplitude is proportional to absorbance. With either approach the dynamic range of the transmitted intensity is much smaller than for a ring-down experiment, allowing high gain before the signal is digitized. Initial experimental results measuring carbon monoxide are presented, and the dependence of detection sensitivity on experimental parameters such as pseudo-random clock rate is discussed.
URI: http://hdl.handle.net/1811/38240
Other Identifiers: 2009-FD-02
Bookmark and Share