Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-09-27
2005-09-27
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S2140AG, C250S574000
Reexamination Certificate
active
06949734
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 first frequency and a reference source configured to emit optical radiation that varies in amplitude at a second frequency. A science detector may be configured to detect the optical radiation from the tunable source and the reference source 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: 5339155 (1994-08-01), Partridge et al.
patent: 6064488 (2000-05-01), Brand et al.
patent: 6473181 (2002-10-01), Oakberg
patent: 6594003 (2003-07-01), Horiuchi et al.
International Search Report and the Written Opinion of the International Searching Authority of Application No. PCT/US2004/012379 dated Aug. 30, 2004.
M. Dobbs et al., “Validation of Design for Space Based Tunable Diode Laser Absorption Spectroscopy Payload”, Proc. Spie—Int. Soc. Opt. Eng. (USA), Proceedings of the Spie—The International Society for Optical Engineering, 2002, Spie-Int. Soc. Opt. Eng., USA, vol. 4817, Jul. 10, 2002, pp. 123-128.
I. Dubinsky et al., “Frequency-Modulation-Enhanced Remote Sensing”, Applied Physics B (Lasers and Optics), Oct. 1998, Springer-Verlag, Germany, vol. 867, 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”, 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 Society of America, USA, vol. 37, No. 12, 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.
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. 10/603,695, entitled, “Active Remote Sensing Using a Simultaneous Spectral Sampling Technique,” filed Jun. 26, 2003, 33 page specification and 8 sheets of drawings.
“Application Note 7, FM Spectroscopy With Tunable Diode Lasers,” New Focus, San Jose, California, 2001, pp. 1-10.
Dobbs Michael E.
Gypson Matthew L.
Neff Benjamin R.
Pruitt Jeff D.
ITT Manufacturing Enterprises Inc.
Lee Patrick J.
Porta David
LandOfFree
Active remote sensing using a spectral lock-in technique 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 spectral lock-in technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active remote sensing using a spectral lock-in technique will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3372917