US3902807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for operating an attenuated total reflection infrared system
Assignee: EIDP Inc
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Filing: 1973-10-25
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Granted: 1975-09-02
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Expires: 1993-10-25
Abstract
Abstract In a method for operating an attenuated total reflection infrared system for measuring the concentration of a constituent in a liquid process stream wherein a sample of the stream is irradiated with a beam of radiation at a wavelength, corresponding to the characteristic absorption wavelength of the constituent, the improvement comprises intentionally irradiating the sample with a beam of radiation at a wavelength longer than the characteristic absorption wavelength of the constituent.
Inventors
- 👤 Sydney Winn Fleming
- 👤 Wallace Wen-Chuan Yau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:03
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/55; G01N21/552
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
In a method for operating an attenuated total reflection infrared system for measuring the concentration of a constituent in a liquid process stream, said constituent having a characteristic absorption band with a peak wavelength, which when viewed by internal reflection is distorted towarad longer wavelengths as a consequence of refractive index dispersion and, wherein a sample of the stream is irradiated with a beam of radiation the improvement comprising: intentionally irradiating said sample with a beam of radiation offset to a range of wavelengths longer than the characteristic absorption band peak wavelength of said constituent in place of a beam centered at said peak wavelength thereby compensating for the distortion of the absorption band to improve the sensitivity of the system.
Claim 2
Dependent Claim
121 words
In a method for operating an attenuated total reflection infrared system for measuring the concentration of a constituent in a liquid process stream, said constituent having a characteristic absorption band with a peak wavelength, which when viewed by internal reflection is distorted towarad longer wavelengths as a consequence of refractive index dispersion and, wherein a sample of the stream is irradiated with a beam of radiation the improvement comprising: intentionally irradiating said sample with a beam of radiation offset to a range of wavelengths longer than the characteristic absorption band peak wavelength of said constituent in place of a beam centered at said peak wavelength thereby compensating for the distortion of the absorption band to improve the sensitivity of the system.
Claim 3
Dependent Claim
25 words
The method as defined in claim 1, said characteristic absorption band peak wavelength being in the range of from about 3 to about 10 micrometers.
Claim 4
Dependent Claim
29 words
The method as defined in claim 1, said constituent having a characteristic absorption band peak wavelength of 4.40 micrometers and being intentionally irradiated at a wavelength of 4.48 micrometers.
Claim 5
Dependent Claim
29 words
The method as defined in claim 1, said constituent having a characteristic absorption band peak wavelength of 4.40 micrometers and being intentionally irradiated at a wavelength of 4.56 micrometers.
Claim 6
Dependent Claim
124 words
In a method for operating an attenuated total reflection infrared system for measuring the concentration of a constituent in a liquid process stream, said constituent having a characteristic absorption band with a peak wavelength, which when viewed by internal reflection is distorted toward longer wavelengths as a consequence of refractive index dispersion and wherein a sample of the stream is irradiated with a beam of radiation, the improvement comprising: intentionally analyzing the beam of radiation emanating from the sample over a range of wavelengths longer than the characteristic absorption band peak wavelength of said constituent in place of analyzing over a range of wavelengths centered at said peak wavelength thereby compensating for the distortion of the absorption band to improve sensitivity of the system.
Claim 7
Dependent Claim
124 words
In a method for operating an attenuated total reflection infrared system for measuring the concentration of a constituent in a liquid process stream, said constituent having a characteristic absorption band with a peak wavelength, which when viewed by internal reflection is distorted toward longer wavelengths as a consequence of refractive index dispersion and wherein a sample of the stream is irradiated with a beam of radiation, the improvement comprising: intentionally analyzing the beam of radiation emanating from the sample over a range of wavelengths longer than the characteristic absorption band peak wavelength of said constituent in place of analyzing over a range of wavelengths centered at said peak wavelength thereby compensating for the distortion of the absorption band to improve sensitivity of the system.
References Cited (Backward Citations)
US3803384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |