US4619528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase resolved modulation Raman spectrometer
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-01-26
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Granted: 1986-10-28
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Expires: 2004-01-26
Abstract
Abstract A system for measuring fluorescence-suppressed Raman Scattering using intensity-modulated laser excitation, electro-optic demodulation of the emitted and scattered light, and a means to adjust the phase of optical transmission of the demodulator relative to the laser modulation.
Inventors
- 👤 Azriel Z. Genack
- 👤 Bruce N. Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:02
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/44; G01J2003/4424
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A system for measuring fluorescencesuppressed Raman scattering from a sample comprising: (a) a continuous wave laser beam means, whose intensity is modulated by a first modulator said modulated beam striking said sample so as to produce fluorescent and Raman radiation, wherein said fluorescent radiation is out of phase with Raman radiation by the angle φ; (b) an optical modulator means positioned so that said fluorescent and Raman radiation passes through a second modulator; (c) a phase shifter means for adjusting the phase of said second modulator by φ±φ o relative to said modulated laser beam where φ o is an arbitrary phase; (d) spectrometer means for dispersing said radiation passing through said second modulator into spectra as a function of wavelength; (e) means for detecting said dispersed radiation, said spectra obtained at φ-φ o then being subtracted from said spectra obtained at φ+φ o .
Claim 2
Independent Claim
145 words
A system for measuring fluorescencesuppressed Raman scattering from a sample comprising: (a) a continuous wave laser beam means, whose intensity is modulated by a first modulator said modulated beam striking said sample so as to produce fluorescent and Raman radiation, wherein said fluorescent radiation is out of phase with Raman radiation by the angle φ; (b) an optical modulator means positioned so that said fluorescent and Raman radiation passes through a second modulator; (c) a phase shifter means for adjusting the phase of said second modulator by φ±φ o relative to said modulated laser beam where φ o is an arbitrary phase; (d) spectrometer means for dispersing said radiation passing through said second modulator into spectra as a function of wavelength; (e) means for detecting said dispersed radiation, said spectra obtained at φ-φ o then being subtracted from said spectra obtained at φ+φ o .
Claim 3
Dependent Claim
11 words
The system of claim 1 wherein said φ is substantially 90°.
Claim 4
Dependent Claim
14 words
The system of claim 1 wherein said detecting means is an optical multichannel analyzer.
Claim 5
Dependent Claim
16 words
The system of claim 1 wherein either of said modulators are electro or acousto optical modulators.
Claim 6
Dependent Claim
21 words
The system of claim 1 wherein either of said first and second modulator comprises a Pockels cell and a polarizer means.
Claim 7
Dependent Claim
24 words
The system of claim 1 wherein said detecting means is a slow detector that is unresponsive to the modulation frequency of said modulator means.
Claim 8
Dependent Claim
11 words
The system of claim 1 wherein the arbitrary angle is π/2.
References Cited (Backward Citations)
US3807862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |