| 摘要 |
<p>1,160,130. Particle analyzing apparatus. COULTER ELECTRONICS Ltd. Nov.22, 1966 [Feb. 14, 1966], No.52318/66. Heading G1N. [Also in Division G4] Apparatus for counting the number of particles per unit volume of a fluid comprises means for passing the fluid through a plurality of apertures 205-207 and deriving from the passage of each particle a signal related to the size of the particle. The invention is concerned with detecting a clogged aperture so that a false reading may be discounted. In simplest form Fig. 1 (not shown) two like-sized apertures are used and the two signal channels should produce similar results which are then averaged. If the difference between the two channels is sufficient the read-out circuit is disabled and an alarm given. In the case of three like-sized apertures the readings of pairs of channels are compared, whereby a defective channel is detected. The readings of correctlyoperating channels are averaged and fed to a readout. Three apertures of varied size may be employed and compensation made for these sizes whereby a distribution of particle size is obtained. Narrow bands of sized particle counts from the small and medium, and medium and large apertures are compared, substantial disagreement indicating which channel is faulty and disabling the appropriate read-out, Fig.3 (not shown).</p> |
