Accession Number : ADD010392

Title :   An apparatus for A Method of Measuring the Intrinsic Time Constant of Liquids.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Fenneman,David B ; Rinehart,Larry F ; Hardesty,Leonard W , Jr

Report Date : 14 Jun 1983

Pagination or Media Count : 18

Abstract : The intrinsic time constant tau of liquids is measured directly by using the apparatus of the present invention termed a taumeter . The taumeter impresses a predetermined voltage, level between a pair of electrode immersed in the liquid to be measured. The taumeter then measures the time it takes for the foregoing voltage to decay from a predetermined value VA to a predetermined value VB. Comparator logic produces a gate pulse having a leading edge at a time TA corresponding to the occurrance of the predetermined voltage VA and a trailing edge at a time TB corresponding to the occurrance of the predetermined voltage VB. The gate pulse is used to gate a system counter which counts the zero crossings of a very accurate system clock to determine the intrinsic time constant of the liquid. The foregoing pulsing is repeated as determined by a duty cycle generator. (Author)

Descriptors :   *Patent applications, *Test equipment, *Electrodes, *Voltage, *Measurement, Generators, Liquids, Decay, Time, Trailing edges, Value, Pulses, Clocks, Inventions

Subject Categories : Physical Chemistry
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE