US4068125A
Expired / Lapsed
US
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Laser absorption spectroscopy employing varying absorption conditions
Assignee: Diax Corp
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Filing: 1975-02-18
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Granted: 1978-01-10
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Expires: 1995-02-18
Abstract
Abstract In laser absorption spectroscopy a fluid sample is irradiated with a beam of coherent optical radiation preferably in the infrared band. A detector such as an acoustic detector or thermal detector is coupled in acoustic or thermal energy exchanging relation, respectively, with the fluid medium to detect the absorption of energy, if any, by the fluid from the beam of coherent radiation. One or more of the physical or chemical parameters of the fluid or substances interacting with the fluid are changed and resultant changes, if any, are detected in the absorption of energy by the fluid to yield information concerning the fluid or substances interacting with the fluid.
Inventors
- 👤 William E. Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:40
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/39
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
104 words
In a method of laser absorption spectroscopy, the steps of: irradiating a fluid sample medium with a beam of coherent infrared optical radiation; coupling a detector in energy exchanging relation with the fluid sample medium to detect the absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; changing an electrical field in the fluid medium to effect a corresponding change in the absorption of energy by the fluid medium from the beam of infrared radiation; and detecting resultant changes in the absorption of the infrared radiation by the fluid medium occasioned by the change in the electric field.
Claim 2
Dependent Claim
104 words
In a method of laser absorption spectroscopy, the steps of: irradiating a fluid sample medium with a beam of coherent infrared optical radiation; coupling a detector in energy exchanging relation with the fluid sample medium to detect the absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; changing an electrical field in the fluid medium to effect a corresponding change in the absorption of energy by the fluid medium from the beam of infrared radiation; and detecting resultant changes in the absorption of the infrared radiation by the fluid medium occasioned by the change in the electric field.
Claim 3
Dependent Claim
104 words
In a method of laser absorption spectroscopy, the steps of: irradiating a fluid sample medium with a beam of coherent infrared optical radiation; coupling a detector in energy exchanging relation with the fluid sample medium to detect the absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; changing a magnetic field in the fluid medium to effect a corresponding change in the absorption of energy by the fluid medium from the beam of infrared radiation; and detecting resultant changes in the absorption of the infrared radiation by the fluid medium occasioned by the change in the magnetic field.
Claim 4
Dependent Claim
104 words
In a method of laser absorption spectroscopy, the steps of: irradiating a fluid sample medium with a beam of coherent infrared optical radiation; coupling a detector in energy exchanging relation with the fluid sample medium to detect the absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; changing a magnetic field in the fluid medium to effect a corresponding change in the absorption of energy by the fluid medium from the beam of infrared radiation; and detecting resultant changes in the absorption of the infrared radiation by the fluid medium occasioned by the change in the magnetic field.
Claim 5
Dependent Claim
116 words
In a method of laser absorption spectroscopy, the steps of: irradiating a fluid sample medium with a beam of coherent infrared optical radiation; coupling a detector in energy exchanging relation with the fluid medium to detect the absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; changing a physical or chemical parameter effecting absorption of energy by the fluid medium from the beam of infrared radiation at a first rate and a second rate, said second rate being higher than said first rate, and detecting the resultant changes in the absorption of the energy by the sample fluid medium from the beam of coherent infrared radiation at said second rate.
Claim 6
Dependent Claim
116 words
In a method of laser absorption spectroscopy, the steps of: irradiating a fluid sample medium with a beam of coherent infrared optical radiation; coupling a detector in energy exchanging relation with the fluid medium to detect the absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; changing a physical or chemical parameter effecting absorption of energy by the fluid medium from the beam of infrared radiation at a first rate and a second rate, said second rate being higher than said first rate, and detecting the resultant changes in the absorption of the energy by the sample fluid medium from the beam of coherent infrared radiation at said second rate.
Claim 7
Dependent Claim
30 words
The method of claim 3 including the step of, detecting the resultant changes of the absorption of the energy by the fluid medium from the beam at the first rate.
Claim 8
Dependent Claim
120 words
In a method of laser absorption spectroscopy, the steps of: irradiating a fluid sample medium with a beam of coherent infrared optical radiation; coupling a detector in energy exchanging relation with the fluid sample medium to detect the absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; adjusting the pressure of the fluid medium so as to effect a substantial pressure broadening of the fluid sample infrared absorption spectrum; changing a physical or chemical parameter effecting absorption of energy by the fluid medium by modulating the pressure of the fluid medium; and synchronously detecting the changes in the absorption of the energy of the fluid medium at the pressure modulation frequency or harmonics thereof.
Claim 9
Dependent Claim
120 words
In a method of laser absorption spectroscopy, the steps of: irradiating a fluid sample medium with a beam of coherent infrared optical radiation; coupling a detector in energy exchanging relation with the fluid sample medium to detect the absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; adjusting the pressure of the fluid medium so as to effect a substantial pressure broadening of the fluid sample infrared absorption spectrum; changing a physical or chemical parameter effecting absorption of energy by the fluid medium by modulating the pressure of the fluid medium; and synchronously detecting the changes in the absorption of the energy of the fluid medium at the pressure modulation frequency or harmonics thereof.
Claim 10
Dependent Claim
102 words
In a laser absorption spectrometer: means for irradiating a fluid sample medium with a beam of coherent infrared optical radiation; detector means coupled in energy exchanging relation with the fluid sample medium to detect absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; means for changing an electric field in the fluid medium to effect a change in the absorption of energy by the fluid medium from the beam of infrared radiation; and means for detecting resultant changes in the absorption of the energy by the fluid medium occasioned by said change in said electric field.
Claim 11
Dependent Claim
102 words
In a laser absorption spectrometer: means for irradiating a fluid sample medium with a beam of coherent infrared optical radiation; detector means coupled in energy exchanging relation with the fluid sample medium to detect absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; means for changing an electric field in the fluid medium to effect a change in the absorption of energy by the fluid medium from the beam of infrared radiation; and means for detecting resultant changes in the absorption of the energy by the fluid medium occasioned by said change in said electric field.
Claim 12
Dependent Claim
102 words
In a laser absorption spectrometer: means for irradiating a fluid sample medium with a beam of coherent infrared optical radiation; detector means coupled in energy exchanging relation with the fluid sample medium to detect absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; means for changing a magnetic field in the fluid medium to effect a change in the absorption of energy by the fluid medium from the beam of infrared radiation; and means for detecting resultant changes in the absorption of the energy by the fluid medium occasioned by said change in said magnetic field.
Claim 13
Dependent Claim
102 words
In a laser absorption spectrometer: means for irradiating a fluid sample medium with a beam of coherent infrared optical radiation; detector means coupled in energy exchanging relation with the fluid sample medium to detect absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; means for changing a magnetic field in the fluid medium to effect a change in the absorption of energy by the fluid medium from the beam of infrared radiation; and means for detecting resultant changes in the absorption of the energy by the fluid medium occasioned by said change in said magnetic field.
Claim 14
Dependent Claim
116 words
In a laser absorption spectrometer: means for irradiating a fluid sample medium with a beam of coherent infrared optical radiation; detector means coupled in energy exchanging relation with the fluid sample medium to detect absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; means for changing a physical or chemical parameter effecting absorption of the energy by the fluid medium from the beam at a first and second rate, said second rate being higher than said first rate; and means for detecting changes in absorption of the energy by the fluid medium at said second rate occasioned by the change in the physical or chemical parameter at said second rate.
Claim 15
Dependent Claim
116 words
In a laser absorption spectrometer: means for irradiating a fluid sample medium with a beam of coherent infrared optical radiation; detector means coupled in energy exchanging relation with the fluid sample medium to detect absorption of energy by the fluid medium from the beam of coherent infrared optical radiation; means for changing a physical or chemical parameter effecting absorption of the energy by the fluid medium from the beam at a first and second rate, said second rate being higher than said first rate; and means for detecting changes in absorption of the energy by the fluid medium at said second rate occasioned by the change in the physical or chemical parameter at said second rate.
Claim 16
Dependent Claim
28 words
The apparatus of claim 8 including, means for detecting the resultant changes in the absorption of energy by the fluid medium from the beam at said first rate.
Claim 17
Dependent Claim
133 words
In a laser absorption spectrometer: means for irradiating a fluid sample medium with a beam of coherent optical infrared radiation; detector means coupled in energy exchanging relation with the fluid sample medium to detect absorption of energy by the fluid medium from the beam of coherent optical infrared radiation; means for adjusting the pressure of the fluid medium so as to effect a substantial pressure broadening of the fluid sample infrared absorption spectrum; means for modulating the pressure of the fluid medium; and means for detecting resultant changes in the absorption of the energy by the fluid medium occasioned by the modulation of the pressure by synchronously detecting the changes in the absorption of energy by the fluid medium from the beam of infrared radiation at the pressure modulation frequency or harmonics thereof.
Claim 18
Dependent Claim
133 words
In a laser absorption spectrometer: means for irradiating a fluid sample medium with a beam of coherent optical infrared radiation; detector means coupled in energy exchanging relation with the fluid sample medium to detect absorption of energy by the fluid medium from the beam of coherent optical infrared radiation; means for adjusting the pressure of the fluid medium so as to effect a substantial pressure broadening of the fluid sample infrared absorption spectrum; means for modulating the pressure of the fluid medium; and means for detecting resultant changes in the absorption of the energy by the fluid medium occasioned by the modulation of the pressure by synchronously detecting the changes in the absorption of energy by the fluid medium from the beam of infrared radiation at the pressure modulation frequency or harmonics thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |