Dynamic mechanical analyzer

Details Dynamic mechanical analyzer Dynamic mechanical analyzer

1976-02-27

1977-07-12

Myracle, Jerry W.

Measuring and testing

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

Content or effect of a constituent of a liquid mixture

73 156, G01N 332

Patent

active

040346021

ABSTRACT:
An instrument for determining the complex mechanical response of samples incorporates two parallel sample arms each pivotally mounted at their central portion by flexure pivots of precisely known spring constants. The sample is mounted on one end of each. An electromechanical driver acts on the other end of one arm to maintain the arms and sample in mechanical oscillation about the pivots. A displacement transducer senses the mechanical motion. A feedback amplifier between the displacement transducer and the driver maintains the oscillation at a constant amplitude and at a resonant frequency determined primarily by the sample. With this arrangement the driver and displacement sensor are removed from the sample and its usual thermal chamber. This improves the stability of the instrument. At the same time the arms are dynamically balanced about the pivots and hence are relatively insensitive to vibrational upset.

REFERENCES:
patent: 3295364 (1967-01-01), Van Dyke
patent: 3324714 (1967-06-01), Simon et al.
patent: 3751977 (1973-08-01), Schilling, Jr.

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