Patent US4647777A successfully refreshed from Google Patents.
US4647777A
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Selective gas detector
Assignee: Ametek Inc
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Filing: 1985-05-31
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Granted: 1987-03-03
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Expires: 2005-05-31
Abstract
Abstract A selective infra-red detector is used to determine the amount of a selected gas present in a gas sample. A beam of infra-red energy is passed through a gas sample and into the selective infra-red detector. An outer annular portion of the beam is reflected from a paraboloidal mirror onto a first focal point, while an inner annular portion of the beam passes through a chamber containing a fluid which will absorb the spectral wavelengths of the selected gas and is reflected by a spherical mirror onto a second focal point. Separate infra-red energy detectors are positioned near the first and second focal points to measure the infra-red energy. The difference or ratio between the infra-red energy measured by each infra-red energy detector is a measure of the amount of selected gas present in the gas sample.
Inventors
- 👤 Emilio Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:20
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/35; G01N21/3504; G01N21/3518; G01N2021/3522; G01N21/47; G01N21/49; G01N21/53; G01N21/534; G01N2021/536
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A selective gas detecting device for providing an indication of the presence of a selected gas in a gas sample comprising: a housing having an inlet opening for receiving a beam of infra-red energy; means comprising a parabolic mirror to reflect a first portion of said beam of infra-red energy to a first focal point; means comprising a spherical mirror to reflect a second portion of said beam of infra-red energy to a second focal point; means to absorb selected spectral wavelengths of said second portion f said beam; and first and second energy detectors positioned respectively proximate said first and second focal points to be exposed to infra-red energy and to provide signals which are indicative of the presence of a selected gas in the gas sample.
Claim 2
Dependent Claim
128 words
A selective gas detecting device for providing an indication of the presence of a selected gas in a gas sample comprising: a housing having an inlet opening for receiving a beam of infra-red energy; means comprising a parabolic mirror to reflect a first portion of said beam of infra-red energy to a first focal point; means comprising a spherical mirror to reflect a second portion of said beam of infra-red energy to a second focal point; means to absorb selected spectral wavelengths of said second portion f said beam; and first and second energy detectors positioned respectively proximate said first and second focal points to be exposed to infra-red energy and to provide signals which are indicative of the presence of a selected gas in the gas sample.
Claim 3
Dependent Claim
33 words
The selective gas detector of claim 1 further including means for moving at least one of said paraboloidal and spherical mirrors to change the position of the first or second focal point, respectively.
Claim 4
Dependent Claim
159 words
A selective gas detecting device comprising: a housing having a cylindrical bore therein with an inlet opening for receiving a beam of infra-red energy; a first mirror carrier mounted for axial movement in said housing; a paraboloidal mirror mounted in said first mirror carrier and positioned to reflect a first portion of said beam of infra-red energy to a first focal point; a second mirror carrier including a chamber mounted for axial movement in said housing; a spherical mirror mounted in said chamber of second mirror carrier and positioned to reflect a second portion of said beam of infra-red energy to a second focal point; first and second energy detectors mounted in said housing and positioned between said first and second mirror carriers and proximate said first and second focal points respectively; and absorbing means positioned in the chamber of said second mirror carrier to absorb selected spectral wavelengths of said second portion of said beam of infra-red energy.
Claim 5
Dependent Claim
159 words
A selective gas detecting device comprising: a housing having a cylindrical bore therein with an inlet opening for receiving a beam of infra-red energy; a first mirror carrier mounted for axial movement in said housing; a paraboloidal mirror mounted in said first mirror carrier and positioned to reflect a first portion of said beam of infra-red energy to a first focal point; a second mirror carrier including a chamber mounted for axial movement in said housing; a spherical mirror mounted in said chamber of second mirror carrier and positioned to reflect a second portion of said beam of infra-red energy to a second focal point; first and second energy detectors mounted in said housing and positioned between said first and second mirror carriers and proximate said first and second focal points respectively; and absorbing means positioned in the chamber of said second mirror carrier to absorb selected spectral wavelengths of said second portion of said beam of infra-red energy.
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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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |