Pulse edge measurement for determining particle dimensional char

Details Pulse edge measurement for determining particle dimensional char Pulse edge measurement for determining particle dimensional char

1979-04-20

1981-04-21

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250461B, 356335, G01N 2300, G01N 2164, G01N 1502

Patent

active

042635080

ABSTRACT:
Method and apparatus for analyzing pulses from optical devices such as flow cytometers to generate indicators of particle dimensional attributes, such as size and shape, as well as orientations in a flow stream of non-spherical particles. Particles are conveyed through a beam of electromagnetic radiation and a photodetector responds to radiation resulting from interaction of the particle with the beam to output a resultant signal in the form of a pulse as a particle enters and passes through the beam. Pulse edge width between two threshold values, preferably established as constant fractions of peak pulse amplitude, is measured as an indication of a particle dimensional attribute.

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