Multi-point gas detector
First Claim
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1. An apparatus comprising:
- a housing that is configured to carry a multiple diode source, a first sensor having an axis, and a second sensor, wherein the housing defines;
an internal channel that extends along a central axis, anda gas responsive tape port centered about the axis of the first sensor;
the multiple diode source comprising multiple diodes that are configured to emit radiant energy at substantially the same wavelength,wherein the multiple diode source is carried by the housing at a selected radiant energy emitting orientation such that radiant energy emitted from the multiple diode source is directed through the internal channel along the central axis and output towards the gas responsive tape port;
wherein the first sensor is configured to sense radiant energy along the axis of the first sensor due to the emitted radiant energy from the multiple diode source being reflected from the central axis via the gas responsive tape port andthe second sensor is configured tosense radiant energy emitted from the multiple diode source, andis responsive to emitted radiant energy from the multiple diode source; and
wherein the second sensor provides input to control circuitry that maintains output of the radiant energy from the multiple diode source.
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Abstract
A gas detection apparatus includes a housing which carries a plurality of light emitting diodes which are coupled in parallel and which emit substantially the same wavelength of radiant energy. A closed loop control circuit maintains the radiant energy output of the diodes at substantially a predetermined value. The radiant light radiant light and a sample of a gas of interest are directed to a sensing position at which a gas responsive tape is positioned. Reflected light from the tape is detected at a sensor displaced from the tape. A light collecting element can be positioned between the coupled diodes and the sensing position.
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Citations
20 Claims
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1. An apparatus comprising:
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a housing that is configured to carry a multiple diode source, a first sensor having an axis, and a second sensor, wherein the housing defines; an internal channel that extends along a central axis, and a gas responsive tape port centered about the axis of the first sensor; the multiple diode source comprising multiple diodes that are configured to emit radiant energy at substantially the same wavelength, wherein the multiple diode source is carried by the housing at a selected radiant energy emitting orientation such that radiant energy emitted from the multiple diode source is directed through the internal channel along the central axis and output towards the gas responsive tape port; wherein the first sensor is configured to sense radiant energy along the axis of the first sensor due to the emitted radiant energy from the multiple diode source being reflected from the central axis via the gas responsive tape port and the second sensor is configured to sense radiant energy emitted from the multiple diode source, and is responsive to emitted radiant energy from the multiple diode source; and wherein the second sensor provides input to control circuitry that maintains output of the radiant energy from the multiple diode source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus comprising:
a housing that is configured to carry a plurality of radiant energy sensors and a plurality of radiant energy sources, wherein the housing defines; a plurality of substantially identical gas responsive tape ports, where each gas responsive tape port is centered about an axis from one of the radiant energy sensors, a plurality of internal radiant energy paths that extends along a central axis that is at an angle of forty-five degrees to the axis from one of the radiant energy sensors, and a second plurality of paths that extends parallel to the axis of the radiant energy sensors, where each of the second plurality of paths is configured to receive one of the plurality of radiant energy sensors; wherein the plurality of radiant energy sources are carried by the housing such that radiant energy emitted from each radiant energy source is directed through one of the internal radiant energy paths along a central axis and output towards one of the gas responsive tape ports, and the plurality of radiant energy sensors are configured such that each radiant energy sensor senses radiant energy along one of the second plurality of paths due to emitted radiant energy from one of the plurality of radiant energy sources being reflected from one of the internal radiant energy paths via one of the gas responsive tape ports. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
Specification