US4571074A
Expired / Lapsed
US
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Spectrometry device for analyzing polychromatic light
Assignee: Horiba Jobin Yvon SAS
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Filing: 1982-12-23
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Granted: 1986-02-18
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Expires: 2002-12-23
Abstract
Abstract Spectrometry device capable of splitting up, for analysis, polychromatic light, thus yielding a spectrum which extends into the ultraviolet, visible and near infra-red ranges. The device makes it possible to analyze the polychromatic light coming from an excitation source and comprises a polychromator provided with a concave grating, which receives the said polychromatic light through an inlet slit in order to diffract it into monochromatic bundles of the ultraviolet region, directed onto outlet slits that are associated with measuring detectors, the slits and grating being positioned on the Rowland circle, wherein, essentially, the order O bundle, which is symmetrical to the incident bundle, relative to the perpendicular on the grating (23), is taken up by a second optical device which disperses the said bundle into monochromatic bundles of the visible or near infra-red regions, at least one outlet slit (8) selecting one monochromatic bundle, measured by a measuring detector (28). The device is particularly intended for a direct reading emission spectrometry instrument.
Inventors
- 👤 Alain Thevenon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:58
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/18; G01J3/20; G01J3/28; G01J3/30; G01J3/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
306 words
A spectrometry device for spectrographic separation and analysis of a first polychromatic light produced by an excitation source in the ultra-violet, visible and near infra-red region, comprising: (I) a first spectrographic section, comprising: (a) first inlet slit means for receiving said first polychromatic light from said excitation source; (b) coupling means for coupling light from said polychromatic excitation source onto said first inlet slit means; (c) first grating means for receiving said polychromatic light passing through said first inlet slit means and diffracting light incident on said first grating means into at least one monochromatic bundle in the ultra-violet range and a second O order polychromatic bundle in the visible and near infra-red range, said O order bundle being symmetrical to the incident bundle about a perpendicular to said first grating, and said O order bundle being imaged at a O order focal point; (d) first outlet slit means positioned for receiving said ultra-violet range monochromatic bundles diffracted from said first grating means; and (e) first measuring detector means mounted behind the first outlet slit means for measuring the intensity of the ultra-violet range light passing through said first outlet slit means; and (II) a second spectrographic section for analyzing said O order bundle of light from said first grating means, said second spectrographic section, comprising: (f) second inlet slit means located at sid O order focal point; (g) second grating means for receiving said O order bundle passing through said second inlet slit means and diffracting it into at least one monochromatic bundle in the visible/near infra-red region; (h) second outlet slit means positioned for receiving visible and infra-red light bundles diffracted from said second grating means; and (i) second measuring detector means mounted behind said second outlet slit means for measuring the intensity of said monochromatic bundles in the visible and near infra-red range.
Claim 2
Dependent Claim
306 words
A spectrometry device for spectrographic separation and analysis of a first polychromatic light produced by an excitation source in the ultra-violet, visible and near infra-red region, comprising: (I) a first spectrographic section, comprising: (a) first inlet slit means for receiving said first polychromatic light from said excitation source; (b) coupling means for coupling light from said polychromatic excitation source onto said first inlet slit means; (c) first grating means for receiving said polychromatic light passing through said first inlet slit means and diffracting light incident on said first grating means into at least one monochromatic bundle in the ultra-violet range and a second O order polychromatic bundle in the visible and near infra-red range, said O order bundle being symmetrical to the incident bundle about a perpendicular to said first grating, and said O order bundle being imaged at a O order focal point; (d) first outlet slit means positioned for receiving said ultra-violet range monochromatic bundles diffracted from said first grating means; and (e) first measuring detector means mounted behind the first outlet slit means for measuring the intensity of the ultra-violet range light passing through said first outlet slit means; and (II) a second spectrographic section for analyzing said O order bundle of light from said first grating means, said second spectrographic section, comprising: (f) second inlet slit means located at sid O order focal point; (g) second grating means for receiving said O order bundle passing through said second inlet slit means and diffracting it into at least one monochromatic bundle in the visible/near infra-red region; (h) second outlet slit means positioned for receiving visible and infra-red light bundles diffracted from said second grating means; and (i) second measuring detector means mounted behind said second outlet slit means for measuring the intensity of said monochromatic bundles in the visible and near infra-red range.
Claim 3
Dependent Claim
14 words
A spectrometry device as in claim 1, wherein said coupling means comprises an objective.
Claim 4
Dependent Claim
32 words
A spectrometry device as in claim 2, wherein said first grating means has a line density which causes it to reflect said O order bundle in the same manner as a mirror.
Claim 5
Dependent Claim
44 words
A spectrometry device as in claim 3, wherein said first grating means comprises a concave focusing grating, said first inlet slit means, said first outlet slit means, and said first grating means being located on the Rowland circle defined by said first grating means.
Claim 6
Dependent Claim
30 words
A spectrometry device according to claim 4, wherein said O order bundle is folded by being reflected between said first grating means and said second grating means by a mirror.
Claim 7
Dependent Claim
35 words
A spectrometry device according to claim 4, wherein the number of lines per unit length on said first grating means is greater than the number of lines per unit length on said second grating means.
Claim 8
Dependent Claim
25 words
A spectrometry device according to claim 4, wherein the second grating is a concave holographic grating configued, positioned, and dimensioned to form a planar field.
Claim 9
Dependent Claim
29 words
A spectrometry device according to claim 7, wherein the parameters of the planar field holographic grating are selected so as to correct the astigmatism of the first grating means.
Claim 10
Dependent Claim
38 words
A spectrometry device according to claim 4, wherein the optical path defined by said O order bundle is folded by being reflected by at least one mirror disposed between said first grating means and said second grating means.
Claim 11
Dependent Claim
47 words
A spectrometry device as in claim 1 further comprising a monochromator for analyzing light coming from said excitation source, said light being analyzed by said monochromator representing a portion of the light emitted by said excitation source but not sent to said first or second spectrographic sections.
References Cited (Backward Citations)
US4250465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |