Selective gas detector
AssigneeAmetrek, Inc.
InventorEmilio Meyer
Life of this patent
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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.
Claims3
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.
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.
Dependencies are inferred from the claim text.