US3832061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrometers
Assignee: National Research Development Corp UK
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Filing: 1973-02-13
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Granted: 1974-08-27
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Expires: 1993-02-13
Abstract
Abstract In a spectrometer using a tunable pulsed spin-flip Raman laser as the radiation source, the output of the laser is split into sample and reference beams which are arranged to fall on separate detectors. The ratio of the outputs of the two detectors is computed for each pulse from the laser by means of an electronic system triggered by pulses derived from one of the detectors.
Inventors
- 👤 S Smith
- 👤 R Wood
- 👤 R Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:53
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/39; H; H01; H01S; H01S3/00; H01S3/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
118 words
A spectrometer comprising a tunable pulsed spin-flip Raman laser, means for splitting the output of the laser into sample and reference beams and for directing the sample beam on to a sample under investigation, a first detector for detecting the intensity of the reference beam, a second detector for detecting the intensity of the sample beam after its interaction with the sample, and computing means, for performing a separate computation of the ratio of the outputs of the two detectors in respect of each output pulse from the laser, said computing means including triggering means, operative in response to the reception of a pulse of radiation by one of the detectors, for controlling the performance of each computation.
Claim 2
Dependent Claim
118 words
A spectrometer comprising a tunable pulsed spin-flip Raman laser, means for splitting the output of the laser into sample and reference beams and for directing the sample beam on to a sample under investigation, a first detector for detecting the intensity of the reference beam, a second detector for detecting the intensity of the sample beam after its interaction with the sample, and computing means, for performing a separate computation of the ratio of the outputs of the two detectors in respect of each output pulse from the laser, said computing means including triggering means, operative in response to the reception of a pulse of radiation by one of the detectors, for controlling the performance of each computation.
Claim 3
Dependent Claim
90 words
A spectrometer according to claim 1, in which said computing means comprises two sample-and-hold circuits, means for applying to the respective inputs of the sample-and-hold circuits two synchronous pulses corresponding to each output pulse from the laser and respectively having magnitudes proportional to the detected intensities of the sample and reference beams for that output pulse, means for triggering the sample-and-hold circuits in response to the reception of a pulse of radiation by said first detector, and means for computing the ratio of the respective outputs of the sample-and-hold circuits.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |