US4084100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generation of coherent rotational anti-Stokes spectra
Assignee: Honeywell International Inc
•
Filing: 1976-07-01
•
Granted: 1978-04-11
•
Expires: 1996-07-01
Abstract
Abstract A method and apparatus for spectroscopic gas analysis are provided. Two coherent beams of monochromatic radiation are directed through gaseous material. A tuning mechanism adjusts the frequency difference between the radiation beams to equal substantially the rotational frequency of a preselected constituent of the gaseous material. Radiation scattered by the gaseous material is received by a filtering mechanism adapted to transmit selectively an anti-Stokes signal generated coherently during scattering. The signal is received by a detecting mechanism which indicates the intensity thereof.
Inventors
- 👤 Richard F. Begley
- 👤 Joseph J. Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:28
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/105; H01S3/1055; G; G01; G01J; G01J3/00; G01J3/28; G01J3/44; H01S3/05; H01S3/08; H01S3/081; H01S3/082; H01S3/0823; H01S3/0826; H01S3/106; H01S3/108; H01S3/1086; H01S3/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
Apparatus for analyzing light, comprising: a. radiation source means for generating first and second coherent radiation beams of monochromatic light, said radiation source means comprising a fixed frequency laser adapted to produce said first radiation beam and a dye laser adapted to be pumped by said fixed frequency laser to produce said second radiation beam; b. tuning means for adjusting the frequency difference between said beams of light to equal substantially the rotational frequency of a preselected constituent of gaseous material; c. projecting means for directing said beams of light through said gaseous material to produce scattered radiation containing a detectable signal composed of an anti-Stokes component generated coherently during scattering; d. filtering means adapted to receive said scattered light and selectively transmit said signal; e. detecting means for indicating the intensity of said signal.
Claim 2
Dependent Claim
135 words
Apparatus for analyzing light, comprising: a. radiation source means for generating first and second coherent radiation beams of monochromatic light, said radiation source means comprising a fixed frequency laser adapted to produce said first radiation beam and a dye laser adapted to be pumped by said fixed frequency laser to produce said second radiation beam; b. tuning means for adjusting the frequency difference between said beams of light to equal substantially the rotational frequency of a preselected constituent of gaseous material; c. projecting means for directing said beams of light through said gaseous material to produce scattered radiation containing a detectable signal composed of an anti-Stokes component generated coherently during scattering; d. filtering means adapted to receive said scattered light and selectively transmit said signal; e. detecting means for indicating the intensity of said signal.
Claim 3
Dependent Claim
35 words
Apparatus as recited in claim 1, wherein said radiation source means comprises a dye laser including a dye material, means for exciting said dye material and a laser cavity for generating and transmitting laser radiation.
Claim 4
Dependent Claim
28 words
Apparatus as recited in claim 2, wherein said dye material emits radiation upon being excited, said radiation having a frequency within the transparency range of said gaseous material.
Claim 5
Dependent Claim
29 words
Apparatus as recited in claim 1, wherein said filtering means is a narrow band pass interference filter having its pass band centered at the frequency of said detectable signal.
Claim 6
Dependent Claim
64 words
Apparatus as recited in claim 1, wherein said radiation source means is associated with a time gated electronic detection system having (1) means for measuring the time interval required to send a pulse from said laser into a sample of said gaseous material and receive a return signal caused by radiation scattered therein and (2) means for measuring the amplitude of said return signal.
Claim 7
Independent Claim
105 words
A method for spectroscopically analyzing gas comprising the steps of: a. generating a coherent beam of monochromatic radiation; b. pumping a dye laser with said radiation beam to produce another coherent beam of monochromatic radiation; c. adjusting the frequency difference between the beams of radiation to equal substantially the rotational frequency of a preselected constituent of gaseous material; d. directing the beams of radiation through the gaseous material to produce scattered radiation that contains a detectable signal composed of an anti-Stokes component generated coherently during scattering; e. filtering the scattered radiation to selectively transmit the detectable signal; and f. indicating the intensity of the signal.
Claim 8
Independent Claim
105 words
A method for spectroscopically analyzing gas comprising the steps of: a. generating a coherent beam of monochromatic radiation; b. pumping a dye laser with said radiation beam to produce another coherent beam of monochromatic radiation; c. adjusting the frequency difference between the beams of radiation to equal substantially the rotational frequency of a preselected constituent of gaseous material; d. directing the beams of radiation through the gaseous material to produce scattered radiation that contains a detectable signal composed of an anti-Stokes component generated coherently during scattering; e. filtering the scattered radiation to selectively transmit the detectable signal; and f. indicating the intensity of the signal.
References Cited (Backward Citations)
US3802777A
Cited
US3973134A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |