US3930728A
Expired / Lapsed
US
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Monochromator with concave grating
Assignee: Horiba Jobin Yvon Inc
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Filing: 1974-07-19
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Granted: 1976-01-06
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Expires: 1994-07-19
Abstract
Abstract Monochromator comprising a concave grating, the lines of which are situated at the intersection of the concave surface with a family of surfaces geometrically like the equiphasic surfaces obtained as loci of the luminous intensity maxima produced by the interference of two beams from two point sources C and D, an entry slit A and an exit slit B, wherein the polar coordinates of the points C and D and of the entry slit A and exit slit B in a system of polar coordinates having as its origin the apex of the grating and as reference axis the axis of the grating in a plane of reference passing through this axis are connected by the following relationships: ##EQU1## in which (α, l A ), (β, l B ), (β, l C ) and (δ, l D ) are the polar coordinates of A,B,C and D, respectively, R is the radius of curvature of the grating, ω=(α+β) /2 and φ=(α-β)/2.
Inventors
- 👤 Guy Pieuchard
- 👤 Jean Flamand
- 👤 Genevieve Passereau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/18; G01J3/1838
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
194 words
A monochromator comprising a concave grating the lines of which are situated at the intersection of the concave surface with a family of surfaces geometrically like the equiphasic surfaces obtained as loci of the luminous intensity maxima produced by the interference of two beams from two point sources C and D, means defining an entry slit A and means defining an exit slit B, wherein the polar coordinates of said points C and D and of said entry slit A said exit slit B in a system of polar coordinates having as its origin the apex of said grating and as reference axis the axis of said grating in a plane of reference passing through the axis are connected by the following relationships: ##EQU3## in which (α, l A ), (β, l B ), (γ, l C ) and (δ, l D ) are the polar coordinates of A, B, C and D, respectively, R is the radius of curvature of said grating, ω = (α+β)/2, ω being the angle of rotation of the grating, and φ=(α-β)/2, 2φ being the angle at which the two slits at the summit of the grating are viewed.
Claim 2
Dependent Claim
194 words
A monochromator comprising a concave grating the lines of which are situated at the intersection of the concave surface with a family of surfaces geometrically like the equiphasic surfaces obtained as loci of the luminous intensity maxima produced by the interference of two beams from two point sources C and D, means defining an entry slit A and means defining an exit slit B, wherein the polar coordinates of said points C and D and of said entry slit A said exit slit B in a system of polar coordinates having as its origin the apex of said grating and as reference axis the axis of said grating in a plane of reference passing through the axis are connected by the following relationships: ##EQU3## in which (α, l A ), (β, l B ), (γ, l C ) and (δ, l D ) are the polar coordinates of A, B, C and D, respectively, R is the radius of curvature of said grating, ω = (α+β)/2, ω being the angle of rotation of the grating, and φ=(α-β)/2, 2φ being the angle at which the two slits at the summit of the grating are viewed.
Claim 3
Dependent Claim
50 words
Monochromator according to claim 1, wherein1500 ≦ N ≦ 2000 (N being the number of51°≦ γ ≦ 76° lines per mm of said2°≦ δ ≦ grating)e.0.8R ≦ l O ≦ 1.1R3R ≦ l D ≦ 35R75°≦ 2 l ≦ 95°0.9R ≦ l A ≦ 1.1R0.4R ≦ l B ≦ 0.6.
Claim 4
Dependent Claim
40 words
Monochromator according to claim 2, wherein said grating is a concave spherical calotte having 1584 lines per mm, and: l.sub.C = 0.929R γ = 59.2°
l.sub.D = 6.630R δ = 5°
l.sub.A = 1.055R
l.sub.B = 0.536R 2φ = 85.7°.
Claim 5
Dependent Claim
41 words
Monochromator according to claim 2, wherein said grating is a concave spherical calotte having 1683 lines to the mm and: l.sub.C = 1.03R γ = 65.3°
l.sub.D = 9.68R δ = 5°
l.sub.A = 1.055R
l.sub.B = 0.536R 2φ = 85.7°.
References Cited (Backward Citations)
US3628849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |