公开(公告)号：US4034602A

公开(公告)日：1977-07-12

申请号：US662269

申请日：1976-02-27

Applicant: Lecon Woo ,  John D. McGhee

Inventor： Lecon Woo ,  John D. McGhee

IPC: G01N19/00 ,  G01N3/24 ,  G01N3/32

CPC classification number: G01N3/32 ,  G01N2291/02827

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.

Abstract translation: 用于确定样品的复杂机械响应的仪器包括两个平行的样品臂，每个样品臂通过精确已知的弹簧常数的挠曲枢轴在其中心部分枢转地安装。 样品安装在每个样品的一端。 机电驱动器作用在一个臂的另一端，以使臂和样品围绕枢轴保持机械摆动。 位移传感器检测机械运动。 位移传感器和驱动器之间的反馈放大器将振荡保持在恒定幅度和主要由样本确定的谐振频率。 利用这种布置，驱动器和位移传感器从样品和其通常的热室中移除。 这提高了仪器的稳定性。 同时，臂对于枢轴是动态平衡的，因此对振动不适相对不敏感。