David S Bomse

US Patent:

6351309, Feb 26, 2002

Filed:

Nov 30, 1994

Appl. No.:

08/347814

Inventors:

David S. Bomse - Santa Fe NM
D. Christian Hovde - Santa Fe NM
Joel A. Silver - Santa Fe NM

Assignee:

Southwest Sciences Incorporated - Santa Fe NM

International Classification:

G01N 2135

US Classification:

356437, 250343

Abstract:

Disclosed are a method and apparatus for dual modulation of an optical spectroscopy laser. Demodulation is accomplished in a manner resulting in measurement of absorbance of a gas species, as well as stabilization of laser wavelength and baseline noise reduction.

US Patent:

6356350, Mar 12, 2002

Filed:

Jul 30, 1999

Appl. No.:

09/364806

Inventors:

Joel A. Silver - Santa Fe NM
David S. Bomse - Santa Fe NM

Assignee:

Southwest Sciences Incorporated - Santa Fe NM

International Classification:

G01N 2161

US Classification:

356437, 250343

Abstract:

A method and apparatus for demodulating a plurality of frequency components output from a photodetector in a wavelength modulation spectroscopy system and determining absorption line shapes from the demodulated data. Demodulation is performed with a homodyne demodulator. Line center magnitudes of selected even harmonics of the demodulated output frequency components are measured and the absorption line shape is calculated from the relationship between these magnitudes.

US Patent:

6552792, Apr 22, 2003

Filed:

Oct 13, 2000

Appl. No.:

09/687408

Inventors:

Jeffrey S. Pilgrim - Santa Fe NM
David S. Bomse - Santa Fe NM

Assignee:

Southwest Sciences Incorporated - Santa Fe NM

International Classification:

G01N 2161

US Classification:

356432

Abstract:

A wavelength modulated photoacoustic spectrometry system and method comprising: generating light from a light source; passing the light through a sample area; sampling sound produced by the light passing through the sample area with an acoustic detector; and controlling wavelength of the light with a wavelength controller, wherein the wavelength controller modulates the wavelength according to a waveform comprising square components.

US Patent:

6608683, Aug 19, 2003

Filed:

Feb 12, 2001

Appl. No.:

09/782137

Inventors:

Jeffrey S. Pilgrim - Santa Fe NM
David S. Bomse - Santa Fe NM
Joel A. Silver - Santa Fe NM

Assignee:

Southwest Sciences Incorporated - Santa Fe NM

International Classification:

G01N 2100

US Classification:

356432, 356437, 25033909

Abstract:

A photoacoustic spectroscopy method and apparatus for maintaining an acoustic source frequency on a sample cell resonance frequency comprising: providing an acoustic source to the sample cell to generate a photoacoustic signal, the acoustic source having a source frequency; continuously measuring detection phase of the photoacoustic signal with respect to source frequency or a harmonic thereof; and employing the measured detection phase to provide magnitude and direction for correcting the source frequency to the resonance frequency.

US Patent:

6618148, Sep 9, 2003

Filed:

Feb 12, 2001

Appl. No.:

09/782138

Inventors:

Jeffrey S. Pilgrim - Santa Fe NM
David S. Bomse - Santa Fe NM
Joel A. Silver - Santa Fe NM

Assignee:

Southwest Sciences Incorporated - Santa Fe NM

International Classification:

G01N 2100

US Classification:

356432, 356437, 25033909

Abstract:

A photoacoustic spectroscopy method and apparatus for maintaining an acoustic source frequency on a sample cell resonance frequency comprising: providing an acoustic source to the sample cell, the acoustic source having a source frequency; repeatedly and continuously sweeping the source frequency across the resonance frequency at a sweep rate; and employing an odd-harmonic of the source frequency sweep rate to maintain the source frequency sweep centered on the resonance frequency.

US Patent:

7126685, Oct 24, 2006

Filed:

Dec 31, 2003

Appl. No.:

10/749295

Inventors:

Mark E. Paige - Santa Fe NM, US
David S. Bomse - Santa Fe NM, US
Joel A. Silver - Santa Fe NM, US

Assignee:

Southwest Sciences incorporated - Santa Fe NM

International Classification:

G01J 3/02
G01J 3/42

US Classification:

356326, 356246, 356427

Abstract:

An absorption spectroscopy method comprising providing a sample in a container, rotating the container, while rotating the container, directing a beam of electromagnetic radiation through the container, the beam comprising one or more wavelengths selected from the group consisting of visible wavelengths, infrared wavelengths, and ultraviolet wavelengths, and measuring characteristics of the beam after it passes through the container. Also an absorption spectroscopy apparatus comprising a container holder, a drive rotating the container holder, means for, while rotating the container, directing a beam of electromagnetic radiation through the container, the beam comprising one or more wavelengths selected from visible wavelengths, infrared wavelengths, and ultraviolet wavelengths, and means for receiving the beam after passage through the container.

US Patent:

7616316, Nov 10, 2009

Filed:

Feb 27, 2007

Appl. No.:

11/679608

Inventors:

Joel A. Silver - Santa Fe NM, US
Mark E. Paige - Santa Fe NM, US
David S. Bomse - Santa Fe NM, US

Assignee:

Southwest Sciences Incorporated - Santa Fe NM

International Classification:

G01N 21/00

US Classification:

356437, 356409

Abstract:

An optical spectroscopy apparatus and method for measurement of species concentration, number density, or column density comprising emitting light from a laser light source, receiving light via a fixed length optical path from the source and containing a species to be detected, receiving light via a detector at an end of the path, determining one or more of species concentration, number density, and column density via signal processing electronics connected to the detector, and switching between a plurality of operational modes measuring a same absorption feature of the species depending on measured absorbance.

US Patent:

7800751, Sep 21, 2010

Filed:

Feb 26, 2007

Appl. No.:

11/678943

Inventors:

Joel A. Silver - Santa Fe NM, US
David S. Bomse - Santa Fe NM, US

Assignee:

Southwest Sciences Incorporated - Santa Fe NM

International Classification:

G01N 1/10
G01N 21/00

US Classification:

356246, 356440

Abstract:

An optical cell and a method of operating an optical cell comprising employing a first mirror comprising a first hole therein at approximately a center of the first mirror and through which laser light enters the cell, employing a second mirror comprising a second hole therein at approximately a center of the second mirror and through which laser light exits the cell, and forming a Lissajous pattern of spots on the mirrors by repeated reflection of laser light entering the cell.