Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-03-07
2006-03-07
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S2140AG, C250S574000
Reexamination Certificate
active
07009170
ABSTRACT:
A system for sensing a characteristic of a sample may include a tunable source configured to emit optical radiation that varies over a wavelength range at a sweep frequency and a reference source configured to emit optical radiation at a reference wavelength. A first modulator may be configured to modulate the first optical radiation at a first frequency, and a second modulator may be configured to modulate the second optical radiation at a second frequency that is different from the first frequency and the sweep frequency. A science detector may be configured to detect the optical radiation from the first modulator and the second modulator after interaction with the sample and generate a science signal. A number of lock-in amplifiers may be respectively configured to generate components of the science signal that are present at the first and second frequencies. A processor may be configured to determine a characteristic of the sample based on the components of the science signal that are present at the first and second frequencies.
REFERENCES:
patent: 3676005 (1972-07-01), Chance
patent: 5339155 (1994-08-01), Partridge et al.
patent: 5550636 (1996-08-01), Hagans et al.
patent: 6064488 (2000-05-01), Brand et al.
patent: 6473181 (2002-10-01), Oakberg
patent: 6594003 (2003-07-01), Horiuchi et al.
patent: 2004/0212804 (2004-10-01), Neff et al.
K. Namjou et al.: “Sensitive absorption spectroscopy with a room-temperature distributed-feedback quantum-cascade laser,” Feb. 1, 1998, vol. 23, No. 3, OPTIC LETTERS, pp. 219-221.
“Alpes Lasers: Applications,” http://www.alpeslasers.ch/application/Application.htm, 4 pages.
Co-pending U.S. Appl. No. 10/419,797 entitled, “Active Remote Sensing Using Spectral Lock-In Technique,” filed Apr. 22, 2003, 26 page specification, 6 sheets of drawings.
“Application Note 7, FM Spectroscopy With Tunable Diode Lasers,” New Focus, San Jose, California, 2001, pp. 1-10.
European Search Report of Applications No. 08250489EP dated Oct. 25, 2004.
Michael Dobbs “Validation of Design for Space Based Tunable Diode Laser Absorption Spectroscopy Payload”, Proceedings of the SPIE—The International Society for Optical Engineering SPIE-Int. Soc. Opt. Eng. USA, vol. 4817, Jul. 10, 2002, pp. 123-128.
International Search Report and the Written Opinion of the International Searching Authority of Application No. PCT/US2004/012379 dated Aug. 30, 2004.
I. Dubinsky et al., “Frequency-Modulation-Enhanced Remote Sensing”, Applied Physics B (Lasers and Optics), Oct. 1998, Springer-Verlag, Germany, vol. B67, No. 4, Oct. 1, 1998, pp. 481-492.
Liang-guo Wang “A H/sub 2/0(v) Sensor System for Combustion Diagnostics Using Both Direct Absorption and Frequency Modulation Spectroscopy”, 1995, New York, NY, USA, IEEE, USA, Oct. 30, 1995, pp. 329-333 vol. 2.
Daniel B. Oh et al., “Frequency Modulation Multiplexing for Simultaneous Detection of Multiple Gases by Use of Wavelength Modulation Spectroscopy with Diode Laswers”, Applied Optics, Apr. 20, 1998, Optical Sociey of America, USA, vol. 37, No. 12, Apr. 20, 1998, pp. 2499-2501.
A. M. Bullock et al, “Measurement of Absorption Line Wing Structure by Wavelength Modulation Spectroscopy” Applied Physics Letters, American Institute of Physics., New York, US, vol. 70, No. 10, Mar. 10, 1997, pp. 1195-1197.
Dobbs Michael E.
Gypson Matthew L.
Neff Benjamin R.
Pruitt Jeff D.
ITT Manufacturing Enterprises Inc.
Lee Patrick J.
Porta David
RatnerPrestia
LandOfFree
Active remote sensing using a simultaneous spectral sampling... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Active remote sensing using a simultaneous spectral sampling..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active remote sensing using a simultaneous spectral sampling... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3597389