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US 4,391,338 AGranted
Microbalance and method for measuring the mass of matter suspended within a fluid medium
OwnerHarvey Patashnick, Georg Rupprechtinventors
Life of this patent
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Abstract
The oscillating element in a microbalance is provided with a filter on its oscillating end for the entrapment of matter whose mass is to be determined by passing the medium containing such matter therethrough. The oscillating element itself is hollow and the medium passes first through the filter and then through the oscillating element.
Claims14
Apparatus for measuring the mass of matter suspended in a medium comprising:
- an elongate elastic element having a first end which is anchored and a second end free to oscillate;
- filter means attached to the free end for receiving matter whose mass is to be measured;
- means for driving said element so that its second end with the filter means attached will oscillate at a resonant frequency;
- means for passing the medium containing the matter through the filter means as it oscillates in order to deposit the matter thereon;
- and
- means for sensing changes in the resonant frequency of oscillation of said element and filter as they oscillate.
3 more elements
A method for measuring the mass of matter suspended in a medium comprising the steps of:
- oscillating an elongate elastic element at a resonant frequency in a clamped-free mode, said element having a filter on said end;
- passing the medium through the filter as the elastic element oscillates so as to entrap the matter on the filter;
- and
- sensing changes in the resonant frequency of oscillation of said element and filter during the passing step.
1 more element
Dependencies are inferred from the claim text.