Apparatus for Continuous Recording of Internal Friction
- 1 August 1962
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 33 (8), 850-853
- https://doi.org/10.1063/1.1717989
Abstract
An internal friction apparatus based upon the principle of the torsion pendulum is described. Attached to the inertia member of the pendulum are two coaxial coils which are located in the field of a permanent magnet. Oscillations of the pendulum induce an emf in one coil (the pick‐up coil). The signal is amplified and converted into a square wave of constant amplitude which is used to energize the other coil (the driver coil). Interaction between the driver coil and the magnetic field maintains the system in oscillation, the amplitude being proportional to Q. The output of the pickup coil is measured on a strip chart recorder. After a straightforward calibration procedure, the Q of the system is quantitatively related to the output. The device has been used from 4°K to 150°C.Keywords
This publication has 8 references indexed in Scilit:
- The internal friction of tantalum and columbium foils at ultrasonic frequenciesActa Metallurgica, 1953
- Grain Boundary Relaxation and the Mechanism of Embrittlement of Copper by BismuthJournal of Applied Physics, 1949
- Nouvelle méthode dynamique pour la mesure des constantes d’élasticitéRevue de Métallurgie, 1949
- A Review of Supersonic Methods for Measuring Elastic and Dissipative Properties of SolidsThe Journal of the Acoustical Society of America, 1944
- Intercrystalline Thermal Currents as a Source of Internal FrictionPhysical Review B, 1939
- An Electrostatic Method of Measuring Elastic ConstantsReview of Scientific Instruments, 1938
- The Variation of Young's Modulus with Magnetization and Temperature in NickelPhysical Review B, 1936
- On the Experimental Determination of the Viscosity of Vibrating SolidsPhysical Review B, 1925