Method and apparatus for ejecting a metered amount of particulat

Details Method and apparatus for ejecting a metered amount of particulat Method and apparatus for ejecting a metered amount of particulat

1975-06-05

1976-08-03

Corbin, John K.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Erosion

73432PS, G01N 2700

Patent

active

039731960

ABSTRACT:
A particle study device wherein a non-diluted specific minute amount of fluid sample containing particles is ejected by an ejecting mechanism into a flow stream leading to a sensing zone in the particle study device. The ejecting mechanism includes a hollow body having a thermal expansion device mounted therein. The temperature of the thermal expansion device is monitored and stored. The device operation then is initiated and power is supplied to the thermal expansion device to raise its temperature and cause it to expand thereby to eject from the hollow body a fluid sample. The temperature rise of the thermal expansion device is monitored and when a predetermined temperature rise has occurred indicating ejection of a specific amount of fluid sample, the power supplied to the thermal expansion device is terminated thus terminating further temperature rise and expansion.

REFERENCES:
patent: 3165693 (1965-01-01), Isreeli et al.
patent: 3810010 (1974-05-01), Thom
patent: 3871770 (1975-03-01), von Behrens et al.

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