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US5455673A
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Apparatus and method for measuring and applying a convolution function to produce a standard Raman spectrum
Assignee: Rosemount Inc
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Filing: 1994-05-27
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Granted: 1995-10-03
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Expires: 2014-05-27
Abstract
Abstract A Raman spectrometry apparatus that is capable of measuring and compensating for variabilities in the apparatus comprises a source of substantially monochromatic radiation, means for simultaneously interfacing the radiation with a sample and a reference material, means for simultaneously acquiring at more than one wavelength a convolved Raman spectrum of the sample and a convolved spectrum of the reference material, and means for determining the convolution function of the convolved spectra and applying the convolution function to adjust the convolved Raman spectrum of the sample to produce thereby the standard Raman spectrum of the sample. A method for obtaining the standard Raman spectrum of a sample comprises: (a) simultaneously irradiating the sample and a reference material with a substantially monochromatic radiation source; (b) simultaneously acquiring at more than one wavelength a convolved Raman spectrum of the sample and a convolved spectrum of the reference material; (c) choosing the standard spectrum of the reference material; (d) from the convolved Raman spectrum of the sample and the convolved spectrum of the reference material and the standard spectrum of the reference material, determining the convolution function of the convolved spectra; and (e) applying the convolution function to adjust the convolved Raman spectrum of the sample to produce thereby the standard Raman spectrum of the sample.
Inventors
- 👤 Daniel C. Alsmeyer
- 👤 Brinda A. Gala
- 👤 Vincent A. Nicely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:35
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/44; C; C08; C08F; C08F2400/00; C08F2400/02; G01J2003/2866
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
94 words
A Raman spectrometry apparatus that is capable of measuring and compensating for variabilities in the apparatus, comprising: a source of substantially monochromatic radiation, means for simultaneously interfacing said radiation with a sample and a reference material, means for simultaneously acquiring at more than one wavelength a convolved Raman spectrum of said sample and a convolved spectrum of said reference material, means for determining the convolution function of said convolved spectra and applying said convolution function to adjust said convolved Raman spectrum of said sample to produce thereby the standard Raman spectrum of said sample.
Claim 2
Dependent Claim
94 words
A Raman spectrometry apparatus that is capable of measuring and compensating for variabilities in the apparatus, comprising: a source of substantially monochromatic radiation, means for simultaneously interfacing said radiation with a sample and a reference material, means for simultaneously acquiring at more than one wavelength a convolved Raman spectrum of said sample and a convolved spectrum of said reference material, means for determining the convolution function of said convolved spectra and applying said convolution function to adjust said convolved Raman spectrum of said sample to produce thereby the standard Raman spectrum of said sample.
Claim 3
Dependent Claim
16 words
A Raman spectrometry apparatus according to claim 1 wherein said source of radiation is a laser.
Claim 4
Dependent Claim
15 words
A Raman spectrometry apparatus according to claim 2 wherein said laser is a diode laser.
Claim 5
Dependent Claim
17 words
A Raman spectrometry apparatus according to claim 3 wherein said diode laser is a multi-mode diode laser.
Claim 6
Dependent Claim
25 words
A Raman spectrometry apparatus according to claim 1 wherein the convolved Raman spectrum of said sample includes the convolved Raman spectrum of said reference material.
Claim 7
Dependent Claim
27 words
A Raman spectrometry apparatus according to claim 1 wherein said means for simultaneously interfacing said radiation with a sample and a reference material comprises an optical probe.
Claim 8
Dependent Claim
18 words
A Raman spectrometry apparatus according to claim 6 wherein said optical probe comprises at least one optical fiber.
Claim 9
Dependent Claim
22 words
A Raman spectrometry apparatus according to claim 7 wherein said optical probe further comprises a window or cell comprising said reference material.
Claim 10
Dependent Claim
44 words
A Raman spectrometry apparatus according to claim 1 wherein said means for simultaneously acquiring at more than one wavelength the convolved Raman spectrum of said sample and the convolved spectrum of said reference material comprises a spectrograph in combination with a multi-channel array detector.
Claim 11
Dependent Claim
31 words
A Raman spectrometry apparatus according to claim 9 wherein said multi-channel array detector is a photo-diode array, a charge-coupled device, a photographic film, a Vidicon tube, or a charge injection device.
Claim 12
Dependent Claim
17 words
A Raman spectrometry apparatus according to claim 10 wherein said multi-channel array detector is a charge-coupled device.
Claim 13
Dependent Claim
41 words
A Raman spectrometry apparatus according to claim 1 wherein said means for simultaneously acquiring at more than one wavelength the convolved Raman spectrum of said sample and the convolved spectrum of said reference material comprises an interferometer or a dispersion spectrometer.
Claim 14
Dependent Claim
48 words
A Raman spectrometry apparatus according to claim 1 wherein said means for determining the convolution function of said convolved Raman spectra and applying said convolution function to said convolved Raman spectrum of said sample to produce the standard Raman spectrum of said sample comprises a Fourier transform algorithm.
Claim 15
Dependent Claim
40 words
A Raman spectrometry apparatus according to claim 13 wherein said means comprises a Fourier transform algorithm applied to the convolved Raman spectrum of said sample, the convolved spectrum of said reference material, and the standard spectrum of said reference material.
Claim 16
Dependent Claim
20 words
A Raman spectrometry apparatus according to claim 1 that further comprises means for splitting radiation into at least two beams.
Claim 17
Dependent Claim
32 words
A Raman spectrometry apparatus according to claim 15 wherein said means for splitting radiation into at least two beams comprises a fused fiber optic beam splitter, a prism, or a half-silvered mirror.
Claim 18
Dependent Claim
18 words
A Raman spectrometry apparatus according to claim 16 wherein said means comprises a fused fiber optic beam splitter.
Claim 19
Independent Claim
118 words
A method for obtaining the standard Raman spectrum of a sample that comprises: (a) simultaneously irradiating said sample and a reference material with a substantially monochromatic radiation source; (b) simultaneously acquiring at more than one wavelength a convolved Raman spectrum of said sample and a convolved spectrum of said reference material; (c) choosing the standard spectrum of said reference material; (d) from the convolved Raman spectrum of said sample and the convolved spectrum of said reference material and the standard spectrum of said reference material, determining the convolution function of said convolved spectra; and (e) applying said convolution function to adjust the convolved Raman spectrum of said sample to produce thereby the standard Raman spectrum of said sample.
Claim 20
Independent Claim
118 words
A method for obtaining the standard Raman spectrum of a sample that comprises: (a) simultaneously irradiating said sample and a reference material with a substantially monochromatic radiation source; (b) simultaneously acquiring at more than one wavelength a convolved Raman spectrum of said sample and a convolved spectrum of said reference material; (c) choosing the standard spectrum of said reference material; (d) from the convolved Raman spectrum of said sample and the convolved spectrum of said reference material and the standard spectrum of said reference material, determining the convolution function of said convolved spectra; and (e) applying said convolution function to adjust the convolved Raman spectrum of said sample to produce thereby the standard Raman spectrum of said sample.
Claim 21
Dependent Claim
13 words
A method according to claim 18 wherein said radiation source is a laser.
Claim 22
Dependent Claim
13 words
A method according to claim 19 wherein said laser is a diode laser.
Claim 23
Dependent Claim
15 words
A method according to claim 20 wherein said diode laser is a multi-mode diode laser.
Claim 24
Dependent Claim
23 words
A method according to claim 18 wherein the convolved Raman spectrum of the sample includes the convolved Raman spectrum of the reference material.
Claim 25
Dependent Claim
24 words
A method according to claim 22 wherein the convolved Raman spectrum of the reference material comprises the convolved Raman spectrum of the sample solvent.
Claim 26
Dependent Claim
18 words
A method according to claim 18 wherein the convolved spectrum of the reference material comprises elastically scattered radiation.
Claim 27
Dependent Claim
12 words
A method according to claim 18 wherein said reference material comprises diamond.
Claim 28
Dependent Claim
45 words
A method according to claim 18 wherein the simultaneous acquiring at more than one wavelength of a convolved Raman spectrum of said sample and a convolved spectrum of said reference material is carried out using a first spectrograph in combination with a multi-channel array detector.
Claim 29
Dependent Claim
15 words
A method according to claim 26 wherein said multi-channel array detector comprises a charge-coupled device.
Claim 30
Dependent Claim
35 words
A method according to claim 18 wherein the choosing of the standard spectrum of said reference material is carried out by the averaging of a multiplicity of previously acquired convolved spectra of said reference material.
Claim 31
Dependent Claim
32 words
A method according to claim 18 wherein the choosing of the standard spectrum of said reference material is carried out by the adjusting of a previously acquired spectrum of said reference material.
Claim 32
Dependent Claim
21 words
A method according to claim 18 wherein the determining of said convolution function is carried out by a Fourier transform algorithm.
Claim 33
Dependent Claim
20 words
A method according to claim 26 wherein the standard spectrum of said reference material is acquired using a second spectrograph.
Claim 34
Dependent Claim
114 words
A Raman spectrometry apparatus that is capable of measuring and compensating for variabilities in the apparatus, comprising: a source of substantially monochromatic radiation, an optical waveguide, a radiation filter, an optical probe, a spectrograph, a detector that simultaneously monitors at more than one wavelength the convolved Raman spectrum of a sample and the convolved spectrum of a reference material, and a computer provided with mathematical routines to determine, from said convolved spectra together with a selected standard spectrum of said reference material, the convolution function of said convolved spectra, said convolution function thereafter being applied to adjust the convolved Raman spectrum of said sample to produce thereby the standard Raman spectrum of said sample.
Claim 35
Dependent Claim
114 words
A Raman spectrometry apparatus that is capable of measuring and compensating for variabilities in the apparatus, comprising: a source of substantially monochromatic radiation, an optical waveguide, a radiation filter, an optical probe, a spectrograph, a detector that simultaneously monitors at more than one wavelength the convolved Raman spectrum of a sample and the convolved spectrum of a reference material, and a computer provided with mathematical routines to determine, from said convolved spectra together with a selected standard spectrum of said reference material, the convolution function of said convolved spectra, said convolution function thereafter being applied to adjust the convolved Raman spectrum of said sample to produce thereby the standard Raman spectrum of said sample.
Claim 36
Dependent Claim
14 words
A Raman spectrometry apparatus according to claim 32 that further comprises a beam splitter.
Claim 37
Dependent Claim
16 words
A Raman spectrometry apparatus according to claim 32 wherein said source of radiation is a laser.
Claim 38
Dependent Claim
16 words
A Raman spectrometry apparatus according to claim 34 wherein said laser is a multi-mode diode laser.
Claim 39
Dependent Claim
18 words
A Raman spectrometry apparatus according to claim 32 wherein said optical probe comprises at least one optical fiber.
Claim 40
Dependent Claim
19 words
A Raman spectrometry apparatus according to claim 33 wherein said beam splitter comprises a fused fiber optic beam splitter.
Claim 41
Dependent Claim
18 words
A Raman spectrometry apparatus according to claim 32 wherein said spectrograph is a dispersion spectrograph or a FT-interferometer.
Claim 42
Dependent Claim
16 words
A Raman spectrometry apparatus according to claim 32 wherein said detector is a multi-channel array detector.
Claim 43
Dependent Claim
17 words
A Raman spectrometry apparatus according to claim 39 wherein said multi-channel array detector is a charge-coupled device.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-02 | 1999-04-03 | 1999-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-02 | 2003-04-03 | 2003-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-02 | 2007-04-03 | 2007-10-03 | $7700.00 | Window Closed / Lapsed |