Particle detectors
AssigneeGarrett Thermal Systems Limited
InventorsRonald Knox, Kate Cooper, Kemal Ajay
Life of this patent
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Abstract
A beam detector including a light source, a receiver, and a target, acting in cooperation to detect particles in a monitored area. The target reflects incident light, resulting in reflected light being returned to receiver. The receiver is capable of recording and reporting light intensity at a plurality of points across its field of view. In the preferred form the detector emits a first light beam in a first wavelength band; a second light beam in a second wavelength band; and a third light beam in a third wavelength band, wherein the first and second wavelengths bands are substantially equal and are different to the third wavelength band.
Claims15
A particle detection system including;
- at least one light source adapted to illuminate a volume being monitored, said illumination including a pulse train including a plurality of pulses, said pulse train being repeated with a first period;
- a receiver having a field of view and being adapted to receive light from at least one light source after said light has traversed the volume being monitored and being adapted to generate signals indicative of the intensity of light received at regions within the field of view of the receiver, said receiver being configured to receive light from the at least one light source in a series defined by an exposure time and receiving frame rate;
- a processor associated with the receiver adapted to process the signals generated by the receiver and to detect particles based on a reduction in the intensity of light received from the at least one light source;
- wherein the pulses with the pulse train emitted within each plurality of pulses has a temporal position that is related to the receiving frame rate.
Dependencies are inferred from the claim text.