Apparatus for conducting measurements of...

G - Physics – 01 – N

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328/112, 73/51.5

G01N 21/76 (2006.01) G01N 21/66 (2006.01) H03K 4/02 (2006.01)

Patent

CA 2002100

ABSTRACT OF THE DISCLOSURE An apparatus for conducting measurements of electrochemiluminescent (ECL) phenomena includes a cell unit having an electrode configuration for inducing the emission of ECL light by the application of a selected voltage waveform to a sample fluid including an ECL moiety. The sample fluid is transported to and from the cell unit by a flow-through pump/tubing system. A photomultiplier tube detects the intensity of light emitted by the sample fluid during the ECL measurement process. A computer control unit both analyzes the detected data and provides digital control signals to the cell unit to generate effective voltage waveforms. The digital control signals are supplied to a novel pulse width modulated digital to analog converter which outputs a ramp voltage waveform having the desired slope.

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