Electronic particle detector of the coulter type having conductivity change independence circuitry
Abstract
Abstract APPARATUS AND CIRCUITRY FOR ANALYZING PARTICLES SUSPENDED IN A FLUID MEDIUM, INCLUDING A FIRST INSULATED VESSEL HAVING A SMALL APERTURE OPENING INTO A SECOND INSULATED VESSEL, THE FLUID BEING IN BOTH VESSELS AND CAUSED TO PASS THROUGH THE APERTURE. AN EXCITATION POWER SUPPLY SOURCE OF A.C. OR D.C. TYPE PRODUCES AN ELECTRIC CURRENT BETWEEN THE TWO VESSELS, THE ELECTRICAL IMPEDANCE OF THE SUSPENSION BEING DIFFERENT FROM THAT OF THE PARTICLES, SO THAT A PARTICLE PASSING THROUGH THE APERTURE CHANGES THE IMPEDANCE OF THE APERTURE CONTENTS, THEREBY MODULATING THE CURRENT IN THE APERTURE CONTENTS, AND CAUSING A SIGNAL WHICH IS APPLIED TO THE INPUT OF A DETECTOR CIRCUIT COMPRISING AN AMPLIFIER. THE IMPEDANCE OF THE EXCITATION POWER SUPPLY SOURCE, THE IMPEDANCE OF THE EXCITATION AND THE IMPEDANCE OF THE APERTURE CONTENTS ARE DIMENSIONED AND ARRANGED IN SUCH A MANNER AS TO MAKE THE MAGNITUDES OF THE SIGNALS INDEPENDENT OF SLOW CHANGES IN ELECTRICAL CHARACTERISTICS OF THE SUSPENSION.
Inventors
- 👤 Robert I Klein
- 👤 Walter R Hogg
Bibliographic Details
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