US4192996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measurement of oxygen by differential absorption of UV radiation
Assignee: HP Inc
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Filing: 1978-07-12
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Granted: 1980-03-11
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Expires: 1998-07-12
Abstract
Abstract A device is provided for measuring the concentration of oxygen in a sample utilizing the differential absorption by oxygen (O 2 ) of two closely spaced ultraviolet (UV) radiation lines. The two UV lines are preferably isotope-shifted Hg lines in the vicinity of the Hg atomic transistion line at 1849.5A.
Inventors
- 👤 Melvyn N. Kronick
- 👤 Charles E. Bryson, III
- 👤 John A. Bridgham
- 👤 Sam H. Eletr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:34
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/33
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
191 words
A device for measuring the concentration of O 2 in a sample comprising: source means for providing a primary UV radiation beam from an atomic transition of an element at a nominal wavelength in a spectral region where the transmissivity of oxygen is rapidly varying, said beam including at least one transition line of a first isotope of said element at a wavelength higher than said nominal wavelength, and at least one transition line of a second isotope of said element at a wavelength lower than said nominal wavelength; shifting means for producing from said primary radiation beam a short-shifted radiation beam having an intensity distribution weighted toward said isotope line of wavelength lower than said nominal wavelength, and producing a long-shifted radiation beam having an intensity distribution weighted toward said isotope line of wavelength higher than said nominal wavelength; beam directing means for directing said long-shifted and short-shifted radiation beams through said sample; detection means for detecting the intensities of said long-shifted and short-shifted radiation beams having been transmitted through said sample; and processing means for calculating from said intensities an indication of the concentration of oxygen in said sample.
Claim 2
Independent Claim
191 words
A device for measuring the concentration of O 2 in a sample comprising: source means for providing a primary UV radiation beam from an atomic transition of an element at a nominal wavelength in a spectral region where the transmissivity of oxygen is rapidly varying, said beam including at least one transition line of a first isotope of said element at a wavelength higher than said nominal wavelength, and at least one transition line of a second isotope of said element at a wavelength lower than said nominal wavelength; shifting means for producing from said primary radiation beam a short-shifted radiation beam having an intensity distribution weighted toward said isotope line of wavelength lower than said nominal wavelength, and producing a long-shifted radiation beam having an intensity distribution weighted toward said isotope line of wavelength higher than said nominal wavelength; beam directing means for directing said long-shifted and short-shifted radiation beams through said sample; detection means for detecting the intensities of said long-shifted and short-shifted radiation beams having been transmitted through said sample; and processing means for calculating from said intensities an indication of the concentration of oxygen in said sample.
Claim 3
Dependent Claim
52 words
A device as in claim 1 wherein: said shifting means comprises a first cell containing said first isotope and a second cell containing said second isotope, said primary beam being directed through said first cell to produce said short-shifted beam and being directed through said second cell to produce said long-shifted beam.
Claim 4
Dependent Claim
69 words
A device as in claim 2 wherein: said shifting means further comprises filter means for altering said short-shifted and long-shifted beams by eliminating the emission line at said nominal wavelength during a portion of said measurement; and said processing means utilizes intensities derived from said altered short-shifted and long-shifted beams having passed through said sample as a correction in the calculation of the concentration of oxygen in said sample.
Claim 5
Dependent Claim
52 words
A device as in claim 3 further comprising: reference detection means for detecting the intensities of portions of each of said short-shifted and long-shifted beams which have not passed through said sample, these intensities being utilized by said processing means in calculating said indication of the concentration of oxygen in the sample.
Claim 6
Dependent Claim
21 words
A device as in claim 4 wherein: said primary UV radiation beam is from an atomic transition of the element mercury.
Claim 7
Dependent Claim
20 words
A device as in claim 5 wherein: said atomic transition of mercury produces an emission line at about 1849.5 A.
Claim 8
Dependent Claim
65 words
A device as in claim 4 wherein: said reference detection means comprises a silicon photodetector having a surface which is highly reflective to UV radiation in the vicinity of said nominal wavelength, said reference detection means being spatially positioned to direct reflected portions of said short-shifted and long-shifted radiation beams through said sample while absorbing other portions of said beams and detecting the intensities thereof.
Claim 9
Dependent Claim
21 words
A device as in claim 7 wherein: said primary UV radiation beam is from an atomic transition of the element mercury.
Claim 10
Dependent Claim
20 words
A device as in claim 8 wherein: said atomic transition of mercury produces an emission line at about 1849.5 A.
Claim 11
Dependent Claim
44 words
A device as in claim 2 further comprising: monochromator means in the path of said radiation between said source and said sample, for eliminating from said primary UV radiation beam all emission lines except those in a small bandwidth centered on said nominal wavelength.
Claim 12
Dependent Claim
52 words
A device as in claim 10 further comprising: reference detection means for detecting the intensities of portions of each of said short-shifted and long-shifted beams which have not passed through said sample, these intensities being utilized by said processing means in calculating said indication of the concentration of oxygen in the sample.
Claim 13
Dependent Claim
21 words
A device as in claim 11 wherein: said primary UV radiation beam is from an atomic transition of the element mercury.
Claim 14
Dependent Claim
20 words
A device as in claim 12 wherein: said atomic transition of mercury produces an emission line at about 1849.5 A.
Claim 15
Dependent Claim
21 words
A device as in claim 2 wherein: said primary UV radiation beam is from an atomic transition of the element mercury.
Claim 16
Dependent Claim
20 words
A device as in claim 14 wherein: said atomic transition of mercury produces an emission line at about 1849.5 A.
Claim 17
Independent Claim
125 words
A device for measuring the concentration of oxygen in a sample comprising: source means for providing a first UV radiation beam from an atomic transition line of a first isotope of an element, and a second UV radiation beam from an atomic transition line of a second isotope of said element, said first and second transition lines having wavelengths near a nominal wavelength in a spectral region where the transmissivity of oxygen is rapidly varying; directing means for directing said first and second radiation beams through the sample; detection means for detecting the intensities of said first and second radiation beams having been transmitted through said sample; and processing means for calculating from said intensities an indication of the concentration of oxygen in the sample.
Claim 18
Independent Claim
125 words
A device for measuring the concentration of oxygen in a sample comprising: source means for providing a first UV radiation beam from an atomic transition line of a first isotope of an element, and a second UV radiation beam from an atomic transition line of a second isotope of said element, said first and second transition lines having wavelengths near a nominal wavelength in a spectral region where the transmissivity of oxygen is rapidly varying; directing means for directing said first and second radiation beams through the sample; detection means for detecting the intensities of said first and second radiation beams having been transmitted through said sample; and processing means for calculating from said intensities an indication of the concentration of oxygen in the sample.
Claim 19
Dependent Claim
50 words
A device as in claim 16 wherein said source means comprises: a first cell containing said first isotope of said element, which is excited to provide said first radiation line; and a second cell containing said second isotope of said element, which is excited to provide said second radiation line.
Claim 20
Dependent Claim
50 words
A device as in claim 17 wherein said source means further comprises: beam combining means for combining said first and second radiation beams into a combined beam; and switching means for alternatingly directing said first and second radiation beams from said first and second cells into said beam combining means.
Claim 21
Dependent Claim
37 words
A device as in claim 18 further comprising: monochromator means in the path of said combined beam for eliminating from said combined beam all emission lines except those in a small bandwidth centered on said nominal wavelength.
Claim 22
Dependent Claim
18 words
A device as in claim 19 wherein: said first and second isotopes are isotopes of the element mercury.
Claim 23
Dependent Claim
20 words
A device as in claim 20 wherein: said atomic transition of mercury produces an emission line at about 1849.5 A.
Claim 24
Dependent Claim
18 words
A device as in claim 16 wherein: said first and second isotopes are isotopes of the element mercury.
Claim 25
Dependent Claim
20 words
A device as in claim 22 wherein: said atomic transition of mercury produces an emission line at about 1849.5 A.
References Cited (Backward Citations)
US3869613A
Cited
US4096388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |