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US4308456A
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Method and apparatus for measuring the frequency of radiation
Assignee: VAN DER GAAG LEONARD C
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Filing: 1979-11-19
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Granted: 1981-12-29
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Expires: 1999-11-19
Abstract
Abstract A method and apparatus for measuring the frequency of radiation is described comprising a pair of filters (2,3) or a beam splitter (30) responsive to radiation from a source of radiation (4) for providing a first output having a magnitude which increases and a second output having a magnitude which decreases with an increase in the frequency of said radiation, a divider (11) for providing a ratio of the magnitudes of said first and second outputs and a comparator (14) and memory (17) responsive to the ratio from said divider (11) for providing an output corresponding to the frequency of said radiation.
Inventors
- 👤 Leonard C. van der Gaag
- 👤 Allen Hooker
- 👤 Gerald Puetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:30
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/46; G01J3/50; G01J3/51; G01J3/513; G01J9/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
92 words
A frequency measuring apparatus comprising: means responsive to radiation from a source of radiation for providing a first output having a magnitude which increases and a second output having a magnitude which decreases with an increase in the frequency of said radiation; means providing a third output corresponding to the ratio of the magnitudes of said first and said second outputs; and means responsive to said third output for providing a discrete output for each one of a plurality of discrete frequencies of said radiation as said frequency of said radiation changes.
Claim 2
Dependent Claim
92 words
A frequency measuring apparatus comprising: means responsive to radiation from a source of radiation for providing a first output having a magnitude which increases and a second output having a magnitude which decreases with an increase in the frequency of said radiation; means providing a third output corresponding to the ratio of the magnitudes of said first and said second outputs; and means responsive to said third output for providing a discrete output for each one of a plurality of discrete frequencies of said radiation as said frequency of said radiation changes.
Claim 3
Dependent Claim
32 words
A frequency measuring apparatus according to claim 1 wherein said means responsive to said third output comprises means for comparing said third output with values corresponding to predetermined frequencies of said radiation.
Claim 4
Dependent Claim
35 words
A frequency measuring apparatus according to claim 1 wherein said first and said second output providing means comprise a bandpass filtering means for blocking from said radiation responsive means predominantly nonvisible radiation from said source.
Claim 5
Dependent Claim
46 words
A frequency measuring apparatus according to claim 1 wherein said first and said second output providing means comprise a first filter means having a transmittance which increases and a second filter means having a transmittance which decreases with an increase in the frequency of said radiation.
Claim 6
Dependent Claim
42 words
A frequency measuring apparatus according to claim 1 wherein said first and said second output providing means comprise a frequency dependent beam splitter wherein the magnitude of transmitted and reflected radiation therefrom varies as a function of the frequency of said radiation.
Claim 7
Dependent Claim
37 words
A frequency measuring apparatus according to claim 2 wherein said comparing means comprises: means for storing said values corresponding to said predetermined frequencies of said radiation; and means for comparing said stored values and said third output.
Claim 8
Dependent Claim
51 words
A frequency measuring apparatus according to claim 1 wherein said first and said second output providing means comprise a first and a second photo-detecting apparatus and means for integrating the output of said photo-detecting apparatus; and said ratio providing means comprises means for dividing the integrated outputs of said photo-detecting apparatus.
Claim 9
Dependent Claim
49 words
A frequency measuring apparatus according to claim 7 wherein said photo-detecting apparatus comprises a first and a second photo-detecting means, and a first filter means having a transmittance which increases and a second filter means having a transmittance which decreases with an increase in the frequency of said radiation.
Claim 10
Dependent Claim
38 words
A frequency measuring apparatus according to claim 8 wherein said photo-detecting apparatus comprises means for directing radiation from said source of radiation to said first and said second photo-detecting means through said first and second filter means, respectively.
Claim 11
Dependent Claim
30 words
A frequency measuring apparatus according to claim 8 wherein said first and second filter means are selected from types of filter means known as interference, reflective and absorbing filter means.
Claim 12
Dependent Claim
18 words
A frequency measuring apparatus according to claim 9 wherein said radiation directing means comprises a beam splitting apparatus.
Claim 13
Dependent Claim
36 words
A frequency measuring apparatus according to claim 11 wherein said radiation-directing means comprises: third filter means; and means for directing radiation from said source of radiation through said third filter means to said beam splitting apparatus.
Claim 14
Dependent Claim
30 words
A frequency measuring apparatus according to claim 12 wherein said third filter means comprises filter means selected from the group of filter means consisting of bandpass and cutoff filter means.
Claim 15
Dependent Claim
22 words
A frequency measuring apparatus according to claim 12 wherein said means for directing radiation through said third filter means comprises lens means.
Claim 16
Dependent Claim
18 words
A frequency measuring apparatus according to claim 14 wherein said lens means comprises focusing and collimating lens means.
Claim 17
Independent Claim
89 words
A method of measuring the frequency of radiation from a source of radiation comprising the steps of: providing a first output having a magnitude which increases and a second output having a magnitude which decreases with an increase in the frequency of said radiation; providing a third output corresponding to the ratio of the magnitudes of said first and said second outputs; and comparing said third output with predetermined values corresponding to pre-selected known frequencies of said radiation for providing an output corresponding to the frequency of said radiation.
Claim 18
Independent Claim
89 words
A method of measuring the frequency of radiation from a source of radiation comprising the steps of: providing a first output having a magnitude which increases and a second output having a magnitude which decreases with an increase in the frequency of said radiation; providing a third output corresponding to the ratio of the magnitudes of said first and said second outputs; and comparing said third output with predetermined values corresponding to pre-selected known frequencies of said radiation for providing an output corresponding to the frequency of said radiation.
Claim 19
Dependent Claim
45 words
A method according to claim 16 comprising the step of pre-storing said predetermined values corresponding to said pre-selected known frequencies of said radiation in a storing means and wherein said step of comparing comprises the step of comparing said third output with said prestored values.
Claim 20
Dependent Claim
65 words
A method according to claim 16 wherein said step of pre-storing said values comprises the steps of: providing said first and said second outputs for a plurality of pre-selected known frequencies of said radiation within a predetermined band of said frequencies, providing said third output for each of said plurality of pre-selected known frequencies; and storing a value corresponding to each of said third outputs.
Claim 21
Dependent Claim
24 words
A method according to claim 17 comprising the step of illuminating said source of radiation for providing reflected or scattered radiation from said source.
References Cited (Backward Citations)
US4057146A
Cited
US4057352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |