Development of a Sensitive Couette Rheometer

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  • 高感度共軸二重円筒形回転粘度計型レオメータの開発
  • コウカンド キョウジュク ニジュウ エントウケイ カイテン ネンドケイガタ レオメータ ノ カイハツ

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Description

A rheometer that has an ability of sensitive torque measurement has been developed, which was installed the rheometer functions, such as vibration measurement, based on the coaxial-cylinder rotational viscometer with outer cylinder rotation system that had been developed in our laboratory. The outer cylinder rotation system (Couette style) should be chosen for the rheometry of low viscosity materials. It was necessary to improve the resolution of the motor rotation and the response speed of the torque measurement system. A custom-made stepping motor was employed for the rotation mechanism, which is driven by a high-resolution driving method. As for the torque measurement system, following alternation were made, that is, to decrease the moment of inertia, to improve mechanical strength of the voice coil motor that generates balancing torque against the measuring stress, and to increase the acquisition rate of measurements by using an AD converter. Four modes of driving method, steady flow, vibration, go-and-back rotation, and rectangular wave are programmed for the measurements. As an evaluation of the performance at present from some examination, the torque sensitivity about 3 nNm, and the frequency limit of the vibration measurement mode about 10Hz or higher were found. It was confirmed that this rheometer has advanced elemental abilities. <br>

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