| 摘要 |
<p>A fibre detector 210 comprises a scattering chamber, means 222 for drawing particles 220 through said chamber in a particle stream, said means 222 being adapted such that particles travel in single file with a longitudinal axis substantially aligned with the flow direction, means 212 for illuminating the particle stream within the chamber, an optical detector 236 adapted to collect a portion of light scattered by particles, data processing means adapted to process the signals from the detector, wherein the apparatus further comprises a means 224, 226 for perpendicularly applying a magnetic field across the particle stream. The detector may a radial detector array or linear arrays. A further detector 234 collects scattered light for particle sizing and to trigger the detector 236. A second light source may also be implemented with the first, and a means for providing a sheath of clean air with the particle flow may be included.</p> |
