| 摘要 |
<p>This invention describes a method and apparatus for the detection of airborne biological particles. The detection is based upon the measurement of fluorescence spectra produced by individual airborne particles when they are excited by a single or a sequence of two or more wavelengths of electromagnetic radiation. The apparatus in one aspect comprises a zone through which air to be analysed flows, in use; a source of illumination to illuminate / irradiate airborne particles present in the zone and to excite the particles to fluoresce, the source being a source of non-monochromatic light; and a detector to detect fluorescence from the particles as an indicator of the presence of biological particles. The source is suitably a pulsed xenon source and the detector an array that captures linear spectra for each particle in the airflow.</p> |
