Acoustic impedance system for pipette tip detection

Details Acoustic impedance system for pipette tip detection Acoustic impedance system for pipette tip detection

1988-06-08

1989-07-11

Levy, Stewart J.

Measuring and testing

Sampler, sample handling, etc.

Capture device

B01L 302

Patent

active

048460036

ABSTRACT:
A measuring system for use with automated pipettes for determining the presence or absence of a pipette tip. The central conduit of the pipette is connected to a source of pressure waves, such as a speaker and also connected to a pressure wave detector, such as a microphone. Changes in acoustic impedance between an open conduit when no tip is present, a partially constricted conduit when a tip is present, and a closed conduit when the liquid boundary layer is contacted determine the measured states of the apparatus.

REFERENCES:
patent: 3474902 (1969-10-01), Putman
patent: 4228831 (1980-10-01), Kerns
patent: 4341736 (1982-07-01), Drbal et al.
patent: 4478094 (1984-10-01), Salamaa et al.
patent: 4715413 (1987-12-01), Backlund et al.
patent: 4790183 (1988-12-01), Pfost et al.

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