GAS SENSOR
First Claim
1. A gas sensor comprising:
- a chamber for containing a gas sample in use;
a radiation source adapted to emit radiation within a first waveband;
within the chamber and positioned to receive radiation from the radiation source, a photoluminescent material which, upon absorption of radiation of a first wavelength within the first waveband, emits radiation of a second wavelength, the photoluminescent material being responsive to the presence of a target gas species in the gas sample such that the intensity of the emitted radiation varies according to the concentration of the target gas species in the gas sample;
a luminescence detector assembly positioned at a first location at which radiation emitted by the photoluminescent material can be received, the luminescence detector assembly being adapted to detect radiation of the second wavelength and output a corresponding measurement signal related to the concentration of the target gas species in the gas sample; and
an optics assembly adapted to receive radiation emitted by the radiation source and to converge the radiation towards a second location at which the luminescence detector assembly cannot receive radiation.
1 Assignment
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Accused Products
Abstract
In one aspect of the disclosure, a gas sensor is provided, comprising: a chamber for containing a gas sample in use, and a radiation source adapted to emit radiation within a first waveband. A photoluminescent material, upon absorption of radiation of a first wavelength within the first waveband, emits radiation of a second wavelength, the photoluminescent material being responsive to the presence of a target gas species in the gas sample. The gas sensor further comprises a luminescence detector assembly. The luminescence detector assembly is adapted to detect radiation of the second wavelength and output a corresponding measurement signal related to the concentration of the target gas species. An optics assembly is adapted to receive radiation emitted by the radiation source and to converge the radiation towards a location at which the luminescence detector assembly cannot receive radiation.
21 Citations
44 Claims
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1. A gas sensor comprising:
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a chamber for containing a gas sample in use; a radiation source adapted to emit radiation within a first waveband; within the chamber and positioned to receive radiation from the radiation source, a photoluminescent material which, upon absorption of radiation of a first wavelength within the first waveband, emits radiation of a second wavelength, the photoluminescent material being responsive to the presence of a target gas species in the gas sample such that the intensity of the emitted radiation varies according to the concentration of the target gas species in the gas sample; a luminescence detector assembly positioned at a first location at which radiation emitted by the photoluminescent material can be received, the luminescence detector assembly being adapted to detect radiation of the second wavelength and output a corresponding measurement signal related to the concentration of the target gas species in the gas sample; and an optics assembly adapted to receive radiation emitted by the radiation source and to converge the radiation towards a second location at which the luminescence detector assembly cannot receive radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A gas sensor comprising:
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a chamber for containing a gas sample in use; a radiation source adapted to emit radiation within a first waveband, the radiation being emitted across a first solid angle; within the chamber and positioned to receive radiation from the radiation source, a photoluminescent material which, upon absorption of radiation of a first wavelength within the first waveband, emits radiation of a second wavelength, the photoluminescent material being responsive to the presence of a target gas species in the gas sample such that the intensity of the emitted radiation varies according to the concentration of the target gas species in the gas sample; a luminescence detector assembly positioned at a first location at which radiation emitted by the photoluminescent material can be received, the luminescence detector assembly being adapted to detect radiation of the second wavelength and output a corresponding measurement signal related to the concentration of the target gas species in the gas sample; and a concave mirror assembly adapted to direct radiation from the radiation source towards the photoluminescent material, wherein the concave mirror assembly subtends a solid angle at the radiation source substantially equal to or greater than the first solid angle such that substantially all of the radiation emitted by the source is directed towards the photoluminescent material. - View Dependent Claims (36, 37, 38, 39, 40)
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41. A gas sensor comprising:
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a chamber for containing a gas sample in use; a radiation source adapted to emit radiation within a first waveband; within the chamber and positioned to receive radiation from the radiation source, a photoluminescent material which, upon absorption of radiation of a first wavelength within the first waveband, emits radiation of a second wavelength, the photoluminescent material being responsive to the presence of a target gas species in the gas sample such that the intensity of the emitted radiation varies according to the concentration of the target gas species in the gas sample; a luminescence detector assembly positioned to receive radiation emitted by the photoluminescent material, the luminescence detector assembly being adapted to detect radiation of the second wavelength and output a corresponding measurement signal related to the concentration of the target gas species in the gas sample; a source radiation detector assembly positioned to receive radiation emitted by the radiation source and adapted to detect radiation of the first waveband and output a corresponding reference signal; and a processor adapted to compute the ratio between the measurement signal and the reference signal and to output a normalised measurement signal based on the ratio. - View Dependent Claims (42, 43, 44)
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Specification