Optics: measuring and testing – Sample – specimen – or standard holder or support – Fluid containers
Patent
1975-12-15
1976-12-14
Corbin, John K.
Optics: measuring and testing
Sample, specimen, or standard holder or support
Fluid containers
259DIG46, 356196, G01N 110
Patent
active
039972720
ABSTRACT:
Improved magnetic stirring means for use with an optical absorption cell of the type characterized by a non-magnetic container for fluidic samples to be analyzed, which container has a rectangular cross-section of interior dimensions A .times. B, where A is relatively large compared with B. The stirrer comprises a magnetically responsive body positioned at the bottom of the container, for effecting agitation of the sample in response to a rotating magnetic field applied by field sources which rotate about a vertical axis beneath the container. The stirrer body is of generally cylindrical cross-section, of axial length slightly less than the dimension A, and of diameter slightly less than dimension B. The stirrer body is oriented with its axis in a horizontal plane, and thus its lateral periphery lies closely adjacent to the internal container walls. The body carries permanent magnet means toward one end thereof, which provide a pair of opposite magnetic poles displaced to alternate sides of the body axis. The externally applied rotating magnetic field, alternately attracts and repels the magnetic poles, and the body, by virtue of the constraints imposed by the cell walls, rotates about its horizontal axis. The body preferably carries surface portions which are parallel to the body axis, whereby rotation about said axis drives the surfaces through the sample, to promote the desired agitation. These surface portions may be defined at longitudinally extending notches formed into the cylinder.
Cole Stanley Z.
Corbin John K.
Fisher Gerald M.
Koren Matthew W.
Morrissey John J.
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