Patent US5696762A successfully refreshed from Google Patents.
US3884583A
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US
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Method and apparatus for magnetically modulated resonance analysis of gas
Assignee: Motors Liquidation Co
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Filing: 1973-05-03
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Granted: 1975-05-20
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Expires: 1993-05-03
Abstract
Abstract An ultra-violet resonance absorption gaseous analyzer includes a radiation source comprising the gaseous specie being analyzed and means for exciting the gas to cause emission of spectral lines in resonance with the specie being analyzed. A varying magnetic field applied to the source effects Zeeman splitting of the spectral lines. The use of an AC magnetic field alone causes scanning of the peak of the absorption curve of the specie being analyzed to effect a second harmonic amplitude modulation of the radiation transmitted through the gas or scattered therefrom. By applying a combined DC and AC magnetic field to the source, the Zeeman shifted spectral lines are caused to scan the sides of the absorption curve to cause first harmonic amplitude modulation of the transmitted or scattered radiation.
Inventors
- 👤 Tom T Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:32
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/3103
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A resonance absorption analyzer for measuring the concentration of a predetermined gaseous specie in a sample comprising a line source of radiation fundamentally in resonance with the specie being measured including a quantity of gas of the predetermined specie and means for exciting the gas to produce radiation, means for directing the radiation through the sample for partial absorption thereby, means for detecting the radiation emitted from the sample, and means for producing second harmonic amplitude modulation of the emitted radiation including means for frequency modulating the source radiation for scanning the peak of the absorption cUrve of the specie being measured comprising means for establishing an AC magnetic field only across the source sufficient to produce modulated Zeeman splitting of the source radiation whereby second harmonic amplitude modulation of the emitted radiation occurs, the degree of amplitude modulation depending on the concentration of the predetermined specie in the sample.
Claim 2
Dependent Claim
150 words
A resonance absorption analyzer for measuring the concentration of a predetermined gaseous specie in a sample comprising a line source of radiation fundamentally in resonance with the specie being measured including a quantity of gas of the predetermined specie and means for exciting the gas to produce radiation, means for directing the radiation through the sample for partial absorption thereby, means for detecting the radiation emitted from the sample, and means for producing second harmonic amplitude modulation of the emitted radiation including means for frequency modulating the source radiation for scanning the peak of the absorption cUrve of the specie being measured comprising means for establishing an AC magnetic field only across the source sufficient to produce modulated Zeeman splitting of the source radiation whereby second harmonic amplitude modulation of the emitted radiation occurs, the degree of amplitude modulation depending on the concentration of the predetermined specie in the sample.
Claim 3
Dependent Claim
169 words
A resonance absorption analyzer for measuring the concentration of a predetermined gaseous specie in a sample comprising a line source of radiation fundamentally in resonance with the specie being measured including a quantity of gas of the predetermined specie and means for exciting the gas to produce radiation, means for directing the radiation through the sample for partial absorption thereby, means for detecting the radiation emitted from the sample, and means for frequency modulating the source radiation for scanning the sides of the absorption curve of the specie being measured including means for establishing a DC magnetic field across the source sufficient to effect Zeeman splitting of the source radiation to provide radiation frequencies coincident with the sides of the absorption curve and for superimposing an AC magnetic field across the source to effect scanning of the source radiation along the sides of the absorption curve whereby amplitude modulation of the emitted radiation occurs, the degree of modulation depending on the concentration of the predetermined specie in the sample.
Claim 4
Dependent Claim
169 words
A resonance absorption analyzer for measuring the concentration of a predetermined gaseous specie in a sample comprising a line source of radiation fundamentally in resonance with the specie being measured including a quantity of gas of the predetermined specie and means for exciting the gas to produce radiation, means for directing the radiation through the sample for partial absorption thereby, means for detecting the radiation emitted from the sample, and means for frequency modulating the source radiation for scanning the sides of the absorption curve of the specie being measured including means for establishing a DC magnetic field across the source sufficient to effect Zeeman splitting of the source radiation to provide radiation frequencies coincident with the sides of the absorption curve and for superimposing an AC magnetic field across the source to effect scanning of the source radiation along the sides of the absorption curve whereby amplitude modulation of the emitted radiation occurs, the degree of modulation depending on the concentration of the predetermined specie in the sample.
Claim 5
Independent Claim
136 words
The method of measuring the concentration of a gaseous specie by a resonance absorption technique comprising the steps of providing an absorption cell containing the gaseous specie to be measured, a line source of radiation fundamentally in resonance with the specie being measured, and a detector for measuring radiation emitted from the absorption cell, and effecting second harmonic amplitude modulation of the emitted radiation by modulating the frequency of the source radiation to scan the peak of the absorption curve of the specie being measured by applying an AC magnetic field to the radiation source to effect varying Zeeman splitting of the source radiation thereby modulating the emitted radiation measured by the detector as a second harmonic of the magnetic field frequency, the degree of modulation being dependent on the concentration of the specie being measured.
Claim 6
Independent Claim
136 words
The method of measuring the concentration of a gaseous specie by a resonance absorption technique comprising the steps of providing an absorption cell containing the gaseous specie to be measured, a line source of radiation fundamentally in resonance with the specie being measured, and a detector for measuring radiation emitted from the absorption cell, and effecting second harmonic amplitude modulation of the emitted radiation by modulating the frequency of the source radiation to scan the peak of the absorption curve of the specie being measured by applying an AC magnetic field to the radiation source to effect varying Zeeman splitting of the source radiation thereby modulating the emitted radiation measured by the detector as a second harmonic of the magnetic field frequency, the degree of modulation being dependent on the concentration of the specie being measured.
Claim 7
Independent Claim
153 words
The method of measuring the concentration of a gaseous specie by a resonance absorption technique comprising the steps of providing an absorption cell containing the gaseous specie to be measured, a line source of radiation fundamentally in resonance with the specie being measured, and a detector for measuring radiation emitted from the absorption cell, modulating the frequency of the source radiation to scan the sides of the absorption curve of the species being measured by applying a DC magnetic field to the radiation source to effect Zeeman splitting of the source radiation to provide radiation frequencies coincident with the sides of the absorption curve, and applying a superimposed AC magnetic field to the radiation source to effect modulation of the source radiation to scan the sides of the absorption curve thereby modulating the emitted radiation measured by the detector, the degree of modulation being dependent on the concentration of the specie being measured.
Claim 8
Independent Claim
153 words
The method of measuring the concentration of a gaseous specie by a resonance absorption technique comprising the steps of providing an absorption cell containing the gaseous specie to be measured, a line source of radiation fundamentally in resonance with the specie being measured, and a detector for measuring radiation emitted from the absorption cell, modulating the frequency of the source radiation to scan the sides of the absorption curve of the species being measured by applying a DC magnetic field to the radiation source to effect Zeeman splitting of the source radiation to provide radiation frequencies coincident with the sides of the absorption curve, and applying a superimposed AC magnetic field to the radiation source to effect modulation of the source radiation to scan the sides of the absorption curve thereby modulating the emitted radiation measured by the detector, the degree of modulation being dependent on the concentration of the specie being measured.
References Cited (Backward Citations)
US3449565A
Cited
US3676004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |