High throughput nep measurement

Details High throughput nep measurement High throughput nep measurement

1997-10-06

1999-07-27

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25055901, 3562383, 73160, G01N 2100

Patent

active

059294604

ABSTRACT:
Apparatus and methods for measuring the quantity and size distribution of nep-like entities in a fiber sample. An individualizer presents entities, such as fibers and neps, to a laterally elongated acceleration/deceleration gas flow nozzle having a laterally-extending sensing volume defined within the nozzle perpendicular to gas flow through the nozzle. The feed rate is such that multiple individualized entities are simultaneously presented to the sensing volume. A sensor output device produces a signal indicating the total amount of material within the sensing volume at any given point in time, such that the sensor output signal has a background resulting from fibers, and occasional signal pulses representing neps. An analyzer samples the signal at a sampling rate at least approximating the transit time of a nep-like entity through the sensing volume, and employs pre-sample and post-sample averaging background suppression to recognize a signal amplitude indicative of a nep-like entity.

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