Dynamic mechanical analyzer

Details Dynamic mechanical analyzer Dynamic mechanical analyzer

G - Physics

01

N

73/83

G01N 3/32 (2006.01)

Patent

CA 1070138

ABSTRACT An instrument for determining the complex mechani- cal 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 on 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 re- latively insensitive to vibrational upset.

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