Remote vehicle emission sensing device with single detector
First Claim
1. A gas analysis device for remotely determining at least one characteristic of a vehicle emission plume comprising:
- a radiation source;
a plurality of moveable filters sequentially positionable to receive radiation from said radiation source after the radiation has passed through a vehicle emission plume, each of said filters being capable of filtering out radiation except for a predetermined wavelength band; and
a detector positioned such that radiation from said radiation source may be sequentially directed onto said detector via at least two filters to thereby produce a plurality of detector responses proportional to the intensity of radiation directed onto the detector via said at least two filters.
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Accused Products
Abstract
A remote sensing device for determining at least one characteristic of a vehicle emission plume includes a radiation source, a detector, and a plurality of filters. Either the filters or the detector are movable relative to the other such that different filters, each of which is capable of filtering out radiation except radiation of a predetermined wavelength band, can be used to filter the radiation directed to the detector. Also disclosed is a method for remotely determining at least one characteristic of a vehicle emission plume using a single detector and a plurality of filters wherein either the detector or the filters are positionable relative to one another.
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Citations
20 Claims
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1. A gas analysis device for remotely determining at least one characteristic of a vehicle emission plume comprising:
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a radiation source;
a plurality of moveable filters sequentially positionable to receive radiation from said radiation source after the radiation has passed through a vehicle emission plume, each of said filters being capable of filtering out radiation except for a predetermined wavelength band; and
a detector positioned such that radiation from said radiation source may be sequentially directed onto said detector via at least two filters to thereby produce a plurality of detector responses proportional to the intensity of radiation directed onto the detector via said at least two filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for remotely determining at least one characteristic of a vehicle emission plume comprising the steps of:
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a) providing a source of radiation and a plurality of filters each of which is capable of filtering out radiation except for radiation in a predetermined wavelength band;
b) directing radiation from the source through an emission plume of a moving vehicle to a first filter and then to a detector;
c) generating a first detector response indicative of the intensity of radiation received by the detector;
d) positioning a further filter such that the radiation from the source is directed through the exhaust plume of the moving vehicle to the further filter and then to the detector, e) generating a further detector response indicative of the intensity of light received by the detector via the filter positioned in step d);
f) optionally repeating a sequence of steps d)-e) to obtain an additional detector response for each repetition of the sequence; and
g) determining at least one characteristic of the vehicle emission plume from said detector responses. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for remotely determining at least one characteristic of a vehicle emission plume comprising the steps of:
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a) providing a source of radiation and a plurality of filters each of which is capable of filtering out radiation except for radiation in a predetermined wavelength band;
b) directing radiation from the source through an emission plume of a moving vehicle to a first filter and then to a detector;
c) generating a first detector response indicative of the intensity of radiation received by the detector;
d) positioning the detector such that the radiation from the source may be directed through the exhaust plume to a further filter and then to the detector, e) directing the radiation from the source to the filter positioned in step d) and then to the detector;
f) generating a second detector response indicative of the intensity of light received by the detector via the further filter;
g) optionally repeating a sequence of steps d)-f) to obtain an additional detector response for each repetition of the sequence; and
h) determining at least one characteristic of the vehicle emission plume from said detector responses. - View Dependent Claims (19, 20)
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Specification