Detection of particle characteristics
First Claim
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1. A method of detecting particles in an airflow including:
- receiving a signal indicative of light intensity scattered from the air flow at a plurality of wavelengths;
processing the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter to generate an output signal indicative of at least one characteristic of particles in the air flow, including fitting at least one function to the signals indicative of the intensity of received light and corresponding wavelength dependent parameters; and
determining an output signal indicative of at least one characteristic of particles in the air flow on the basis of a gradient at, at least one point on the at least one function, wherein the gradient is a ratio between the difference in intensity of received light at a plurality of wavelengths and the difference in the corresponding wavelength parameters at said plurality of wavelengths.
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Abstract
A method of detecting particles in an air flow is described. The method includes receiving a signal indicative of light intensity scattered from the air flow at a plurality of wavelengths and processing the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter to generate an output signal indicative of at least one characteristic of particles in the air flow. A particle detection system is also described.
12 Citations
23 Claims
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1. A method of detecting particles in an airflow including:
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receiving a signal indicative of light intensity scattered from the air flow at a plurality of wavelengths; processing the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter to generate an output signal indicative of at least one characteristic of particles in the air flow, including fitting at least one function to the signals indicative of the intensity of received light and corresponding wavelength dependent parameters; and determining an output signal indicative of at least one characteristic of particles in the air flow on the basis of a gradient at, at least one point on the at least one function, wherein the gradient is a ratio between the difference in intensity of received light at a plurality of wavelengths and the difference in the corresponding wavelength parameters at said plurality of wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of detecting particles in an airflow including:
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receiving a signal indicative of light intensity scattered from the air flow at a plurality of wavelengths; processing the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter to generate an output signal indicative of at least one characteristic of particles in the air flow, including fitting at least one function to the signals indicative of the intensity of received light and corresponding wavelength dependent parameters; and determining an output signal indicative of at least one characteristic of particles in the air flow on the basis of a gradient at, at least one point on the at least one function; wherein the step of processing the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter includes, applying a statistical method to the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter to generate an output signal indicative of a characteristic of particles in the air flow.
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23. A particle detection system including:
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a detection chamber adapted to receive an air sample; means for illuminating the air sample at a plurality of wavelengths; means for receiving light scattered from the air sample at the plurality of wavelengths and to output a signal indicative of the intensity of received light at each of the wavelengths; and processing means for processing the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter to generate an output signal indicative of at least one characteristic of particles in the air sample including fitting at least one function to the signals indicative of the intensity of received light and corresponding wavelength dependent parameters, and determining an output signal indicative of at least one characteristic of particles in the air flow on the basis of a gradient at, at least one point on the at least one function, wherein the gradient is a ratio between the difference in intensity of received light at a plurality of wavelengths and the difference in the corresponding wavelength parameters at said plurality of wavelengths.
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Specification