 Quote by russ_watters
Here is the Wereley's 1998 patent on the subject:
Here is Wereley's 2006 patent on the subject:
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From the 2006 patent:
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(b) applying a short pulse of light through an objective lens to the fluid body so as to broadly illuminate the fluid body, and then repeating the application of the light pulse after a known time delay;
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So the patented method is not applicable, as it requires active controlled illumination.