US3865490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter spectrograph
Assignee: McDonnell Douglas Corp
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Filing: 1973-08-29
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Granted: 1975-02-11
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Expires: 1993-08-29
Abstract
Abstract A filter spectrograph unit for use in a micro-Raman spectrometer system or a remote sensing system is formed by combining an infinitely variable spectral line rejection filter (having appropriate entrance optics) functionally and operatively with a dispersing spectrograph. The line rejection filter is a modified form of a zero-dispersion double monochromator having an input light signal including laser light scattered from, for examle, minute Raman-active particles. The modified double monochromator includes an acylindrical mirror positioned so that the laser line will exit through an aperture in the mirror and all other spectral lines will be reflected and reformed by the modified double monochromator into an output light signal containing all of the original spectral information, less the rejected laser line. The dispersing spectrograph is integrally coupled to the modified double monochromator and produces from the output light signal a display of the entire Raman spectrum suitable for parallel readout and rapid data analysis.
Inventors
- 👤 Jack J Grossman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:00
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/02; G01J3/0205; G01J3/0208; G01J3/0243; G01J3/0256; G01J3/0291; G01J3/12; G01J3/18; G01J3/1804; G01J3/28; G01J3/44; G02; G02B; G02B5/00; G02B5/08; G02B5/09
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
145 words
A filter spectrograph unit comprising: a rejection filter including means for producing a first spectrum from input light entering an entrance aperture of said rejection filter, means for rejecting at least one selected spectral line of said first spectrum, and means for reforming the remaining spectral lines of said first spectrum into output light containing all of the original spectral information, less said at least one rejected spectral line, at an exit aperture of said rejection filter; and a dispersing spectrograph including means for producing a second spectrum from input light entering an input aperture of said dispersing spectrograph, said second spectrum being formed at an output aperture of said dispersing spectrograph, and said dispersing spectrograph being coupled to said rejection filter whereby said output light of said rejection filter from said exit aperture thereof is directed into said input aperture of said dispersing spectrograph.
Claim 2
Dependent Claim
145 words
A filter spectrograph unit comprising: a rejection filter including means for producing a first spectrum from input light entering an entrance aperture of said rejection filter, means for rejecting at least one selected spectral line of said first spectrum, and means for reforming the remaining spectral lines of said first spectrum into output light containing all of the original spectral information, less said at least one rejected spectral line, at an exit aperture of said rejection filter; and a dispersing spectrograph including means for producing a second spectrum from input light entering an input aperture of said dispersing spectrograph, said second spectrum being formed at an output aperture of said dispersing spectrograph, and said dispersing spectrograph being coupled to said rejection filter whereby said output light of said rejection filter from said exit aperture thereof is directed into said input aperture of said dispersing spectrograph.
Claim 3
Dependent Claim
36 words
The invention as defined in claim 1 wherein said dispersing spectrograph is integralLy coupled to said rejection filter whereby said exit aperture of said rejection filter also serves as said input aperture of said dispersing spectrograph.
Claim 4
Dependent Claim
74 words
The invention as defined in claim 1 wherein said rejecting means includes an acylindrical mirror having at least one rejection aperture therein and positioned so that said at least one selected spectral line will exit through said at least one rejection aperture in said mirror, and said remaining spectral lines will be reflected by said mirror and reformed by said reforming means into said output light at said exit aperture of said rejection filter.
Claim 5
Dependent Claim
45 words
The invention as defined in claim 1 wherein said input light entering said entrance aperture of said rejection filter includes laser light scattered from material under analysis, and said rejecting means is adapted to reject at least the laser spectral line from said first spectrum.
Claim 6
Dependent Claim
47 words
The invention as defined in claim 4 wherein said exit aperture of said rejection filter is a generally point aperture, and said remaining spectral lines of said first spectrum are reformed by said reforming means at said rejection filter exit aperture into a generally point light source.
Claim 7
Dependent Claim
73 words
The invention as defined in claim 5 wherein said rejecting means includes an acylindrical mirror having at least one rejection aperture therein and positioned so that at least said laser spectral line will exit through said at least one rejection aperture in said mirror, and said remaining spectral lines will be reflected by said mirror and reformed by said reforming means at said rejection filter exit aperture into said generally point light source.
Claim 8
Dependent Claim
45 words
The invention as defined in claim 1 further comprising mask means aligned with and positioned at said output aperture of said dispersing spectrograph, said mask means including at least one aperture therein to pass at least one selected spectral line of said second spectrum therethrough.
Claim 9
Dependent Claim
143 words
In a filter spectrograph unit, a spectral line rejection filter comprising: means for producing a spectrum from input light entering an entrance aperture of said rejection filter; means for rejecting at least one selected spectral line of said spectrum; and means for reforming the remaining spectral lines of said spectrum into output light containing all of the original spectral information, less said at least one rejected spectral line, at an exit aperture of said rejection filter, said rejecting means including a mirror means having at least one rejection aperture therein and positioned so that said at least one selected spectral line will exit through said at least one rejection aperture in said mirror means, and said remaining spectral lines will be reflected by said means and reformed by said reforming means into said output light at said exit aperture of said rejection filter.
Claim 10
Dependent Claim
143 words
In a filter spectrograph unit, a spectral line rejection filter comprising: means for producing a spectrum from input light entering an entrance aperture of said rejection filter; means for rejecting at least one selected spectral line of said spectrum; and means for reforming the remaining spectral lines of said spectrum into output light containing all of the original spectral information, less said at least one rejected spectral line, at an exit aperture of said rejection filter, said rejecting means including a mirror means having at least one rejection aperture therein and positioned so that said at least one selected spectral line will exit through said at least one rejection aperture in said mirror means, and said remaining spectral lines will be reflected by said means and reformed by said reforming means into said output light at said exit aperture of said rejection filter.
Claim 11
Dependent Claim
44 words
The invention as defined in claim 8 wherein said input light entering said entrance aperture of said rejection filter includes laser light scattered from material under analysis, and said rejecting means is adapted to reject at least the laser spectral line from said spectrum.
Claim 12
Dependent Claim
142 words
In a filter spectrograph unit, a spectral line rejection filter comprising: means for producing a spectrum from input light entering an entrance aperture of said rejection filter; means for rejecting at least one selected spectral line of said spectrum; and means for reforming the remaining spectral lines of said spectrum into output light containing all of the original spectral information, less said at least one rejected spectral line, at an exit aperture of said rejection filter, said rejecting means including an acylindrical mirror having at least one rejection aperture therein and positioned so that said at least one selected spectral line will exit through said at least one rejection aperture in said mirror, and said remaining spectral lines will be reflected by said mirror and reformed by said reforming means intO said output light at said exit aperture of said rejection filter.
Claim 13
Dependent Claim
142 words
In a filter spectrograph unit, a spectral line rejection filter comprising: means for producing a spectrum from input light entering an entrance aperture of said rejection filter; means for rejecting at least one selected spectral line of said spectrum; and means for reforming the remaining spectral lines of said spectrum into output light containing all of the original spectral information, less said at least one rejected spectral line, at an exit aperture of said rejection filter, said rejecting means including an acylindrical mirror having at least one rejection aperture therein and positioned so that said at least one selected spectral line will exit through said at least one rejection aperture in said mirror, and said remaining spectral lines will be reflected by said mirror and reformed by said reforming means intO said output light at said exit aperture of said rejection filter.
Claim 14
Dependent Claim
176 words
In a filter spectrograph unit, a spectral line rejection filter comprising: means for producing a spectrum from input light entering an entrance aperture of said rejection filter, said input light entering said entrance aperture of said rejection filter including laser light scattered from material under analysis; means for rejecting at least one selected spectral line of said spectrum, said rejecting means being adapted to reject at least the laser spectral line from said spectrum; and means for reforming the remaining spectral lines of said spectrum into output light containing all of the original spectral information, less said at least one rejected spectral line, at an exit aperture of said rejection filter, said rejecting means including an acylindrical mirror having at least one rejection aperture therein and positioned so that at least said laser spectral line will exit through said at least one rejection aperture in said mirror, and said remaining spectral lines will be reflected by said mirror and reformed by said reforming means at said rejection filter exit aperture into a generally point light source.
Claim 15
Dependent Claim
176 words
In a filter spectrograph unit, a spectral line rejection filter comprising: means for producing a spectrum from input light entering an entrance aperture of said rejection filter, said input light entering said entrance aperture of said rejection filter including laser light scattered from material under analysis; means for rejecting at least one selected spectral line of said spectrum, said rejecting means being adapted to reject at least the laser spectral line from said spectrum; and means for reforming the remaining spectral lines of said spectrum into output light containing all of the original spectral information, less said at least one rejected spectral line, at an exit aperture of said rejection filter, said rejecting means including an acylindrical mirror having at least one rejection aperture therein and positioned so that at least said laser spectral line will exit through said at least one rejection aperture in said mirror, and said remaining spectral lines will be reflected by said mirror and reformed by said reforming means at said rejection filter exit aperture into a generally point light source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |