Optical particle counter system with coincidence recognition

摘要

In a counter system only impulse lengths (PL) within a tolerance region of (PxL) plus or minus (Tx) are counted for impulses of height (Hx), where x is set to correspond to the pulse height. As multiple small particles will not produce a pulse as wide as one large particle they can be discounted and the counter can then be used to accurately count individual particles of a certain size.