Self-calibrating sensor
First Claim
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1. A self-calibrating gas sensor, comprising:
- a flow channel;
a concentration modulator, positioned in the flow channel;
a gas generator adapted to self-generate a calibration gas for resetting a baseline without a known test gas, wherein the gas generator is integrated with and in contact with the flow channel having an inlet coupled to the flow channel to receive a sample gas, and an outlet to provide the received sample gas and calibration gas back into the flow channel downstream from the inlet in the flow channel;
one or more gas detectors, positioned downstream of the concentration modulator and gas generator; and
a pump.
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Abstract
Embodiments of the present invention relate to a gas sensor comprising a flow channel, a concentration modulator positioned in the flow channel, a gas generator in contact with the flow channel, one or more gas detectors positioned downstream of the concentration modulator and gas generator and a pump.
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Citations
27 Claims
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1. A self-calibrating gas sensor, comprising:
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a flow channel; a concentration modulator, positioned in the flow channel; a gas generator adapted to self-generate a calibration gas for resetting a baseline without a known test gas, wherein the gas generator is integrated with and in contact with the flow channel having an inlet coupled to the flow channel to receive a sample gas, and an outlet to provide the received sample gas and calibration gas back into the flow channel downstream from the inlet in the flow channel; one or more gas detectors, positioned downstream of the concentration modulator and gas generator; and a pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17)
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12. A gas self-calibrating sensor, comprising:
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a flow channel; a concentration modulator, positioned in the flow channel, the concentration modulator receiving a sample gas and providing the sample gas and an adsorbed gas into the flow channel; a gas generator adapted to generate a calibration gas in response to an adsorbed gas received from the concentration modulator, the gas generator having an input and an output spaced apart along and coupled to the flow channel to receive the sample gas flowing through the flow channel and to self-generate a calibration gas and add the calibration gas to the sample gas flowing through the flow channel at the output positioned downstream from the input; one or more gas detectors, positioned downstream of the concentration modulator and gas generator; and a pump. - View Dependent Claims (13, 14, 15, 16, 18, 19, 20)
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21. A self-calibrating sensor, comprising:
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a modulator, comprising; an adsorbing mechanism to adsorb at least a least a portion of a sample gas to provide an adsorbed sample and a flow-through sample; a releasing mechanism to periodically release the adsorbed sample from the modulator; a gas generator coupled to the concentration modulator and adapted to self-generate a calibration sample from the adsorbed sample received from the modulator; a detector coupled to the gas generator and the modulator to receive the flow-through sample from the modulator and the calibration sample from the gas generator; and a restrictor coupled between the modulator and the detector and adapted to restrict the flow-through sample when the detector is detecting the calibration sample. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification