Device for torsional oscillation testing

Details Device for torsional oscillation testing Device for torsional oscillation testing

1974-12-19

1976-05-11

Gill, James J.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

73 673, G01N 332

Patent

active

039554090

ABSTRACT:
A device is described for the torsional testing of test bodies which avoids reference to the zero point of oscillation and, accordingly, is independent of zero point shifts. The device is of the type wherein a torsional pendulum can be made to undergo damped torsional oscillation and has a transducer for producing a potential corresponding to torsional oscillation. The duration of oscillation between two reversal points of the oscillation and also the damping are measured by the use of an electrical circuit including first, second, third and fourth series circuits. Each circuit includes a condenser and half-wave rectifier and the circuits are connected in parallel through switches to a transducer. Each rectifier is connected to an auxiliary circuit which, when a potential arises in the blocking direction of the rectifier, supplies a signal to a control circuit. The control circuit, after causing a damped oscillation of the pendulum, connects the first series circuit to the transducer, and after the occurrence of a signal in the auxiliary circuit of one of the series circuits, connects the next series circuit to the transducer. A gate opens and closes upon the occurrence of the two signals to pass pulses from a time pulse emitter to an impulse counter. The charging potentials of the condensers are used by a calculation means to determine the damping factor.

REFERENCES:
patent: 3313148 (1967-04-01), Dautreppe et al.
patent: 3696664 (1972-10-01), Moser
patent: 3718028 (1973-02-01), Moser et al.

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