G - Physics – 01 – N
Patent
G - Physics
01
N
324/45
G01N 15/10 (2006.01) G01N 15/12 (2006.01)
Patent
CA 1273059
ABSTRACT A circuit is used to provide data needed to measure the electrical opacity of a particle, such as a blood cell passing through a Coulter type transducer. The circuit includes a current source for providing a conventional d.c. current through the sensing aperture of the transducer, as well as an oscillator for providing a high frequency current through the aperture. The oscillator includes an active device and a resonant circuit, and the aperture is coupled in parallel with the resonant circuit of the oscillator. As a particle passes through the aperture, the resistance of the aperture increases, which in turn, increases the Q of the oscillator, whereby the oscillator output signal is amplitude modulated in accordance with the increases Q. Multiple oscillators of different frequencies can be coupled in parallel with the transducer through a coupling circuit, which connects each oscillator to the transducer through a low impedance path and isolates each oscillator from signals having frequencies of the other oscillators.
549689
Coulter Wallace H.
Rodriguez Carlos M.
Borden Ladner Gervais Llp
Coulter International Corp.
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