Method for the continuous measurement of the mass of aerosol particles in gaseous samples and a device for the implementation of the method
First Claim
1. A method for the continuous measurement of the mass of aerosol particles in gaseous samples, wherein a sample being traversed by electromagnetic radiation of a wavelength greater than the mean radius of said aerosol particles, and the absorption caused being measured for at least two different frequencies, and wherein the difference of the signals which have been received for the different frequencies and which are proportional to the respective absorption is used as a measurement value corresponding to the total mass of said aerosol particles.
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Accused Products
Abstract
For a continuous measurement of the mass of absorbing particles in a gaseous sample, the sample is traversed by electromagnetic radiation of a wavelength greater than the mean radius of the particles. The difference in absorption for at least two frequencies is determined and appointed to the particle mass sought after.
15 Citations
16 Claims
- 1. A method for the continuous measurement of the mass of aerosol particles in gaseous samples, wherein a sample being traversed by electromagnetic radiation of a wavelength greater than the mean radius of said aerosol particles, and the absorption caused being measured for at least two different frequencies, and wherein the difference of the signals which have been received for the different frequencies and which are proportional to the respective absorption is used as a measurement value corresponding to the total mass of said aerosol particles.
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12. A device for the continuous measurement of the mass of aerosol particles in a gaseous sample which includes a sample chamber for containing said gaseous sample;
- means for directing a beam of electromagnetic radiation through said sample chamber, said electromagnetic radiation having at least two different wavelengths which are longer than the expected means radius of the aerosol particles in the gaseous sample in said sample chamber;
a beam splitter for splitting said beam into partial beams after said beam has passed through said sample chamber;
means for inserting selectively transparent filters into the partial beams for selected frequencies;
a detector; and
a selector unit for enabling said detector to be exposed to said partial beams at a given periodicity. - View Dependent Claims (13, 14, 15)
- means for directing a beam of electromagnetic radiation through said sample chamber, said electromagnetic radiation having at least two different wavelengths which are longer than the expected means radius of the aerosol particles in the gaseous sample in said sample chamber;
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16. A method for the continuous measurement of the mass of aerosol particles in a gaseous sample, the aerosol particles having an expected mean radius, said method comprising the steps of
(a) passing a beam of electromagnetic radiation through said gaseous sample, said electromagnetic radiation having at least two different wavelengths which are longer than said expected mean radius, (b) measuring the absorption by said mass of aerosol particles in said gaseous sample at at least two of said different wavelengths to obtain two measurement signals, and (c) determining the difference between said two measurement signals so as to provide a measurement value which corresponds to the total mass of said aerosol particles in said gaseous sample.
Specification