The development of mechanical spectroscopy for extreamlly low frequency and very high temperature and the application for the ceramics

将扭摆应用于极低频极高温度下的机械光谱分析。扭转应力是由放置在扭转棒上的磁铁施加的磁力施加的。该系统采用赫姆霍兹型磁体，因为应力与应变无关。将相位分析仪产生的正弦波信号放大为磁线圈的电流。通过扭杆放置的涡流式位移传感器检测试件的应变。探测器灵敏度小于1/6000弧度。利用频响分析仪（NF5090）对应力应变信号进行分析，计算出误差在1/6000弧度范围内的相位角。该系统受大气噪声的影响；绝缘体可以控制噪音。对于高达极高温度的测量，我使用了用于高温内耗测量的碳炉。炉周围设置了保护磁铁和传感器的隔热罩。该系统用于陶瓷的高温力学光谱测量。利用新发展的力学光谱技术获得了晶界的可变信息。

Torsion pendulum was applied to the mechanical spectroscopy for extremely low frequency and very high temperatures. torsion stress was applied by the magnetic force using by the magnet placed on the torsion bar. Hermholtz type magnet was used in the system, because the stress is independent for the strain. Sin wave signal, which generated by the phase analyzer, was amplified for the current of magnet coil. The eddy current type displacement sensor placed by the torsion bar detected the strain of the specimen. The sensitivity of the detector is less than 1/6000 radian. The stress and strain signal was analyzed by the frequency response analyzer (NF5090), and then the phase angle was calculated within the error of 1/6000 radian. This system is affected by the atmospheric noise ; the insulator can control the noise. For the measuring up to very high temperature, I used the carbon furnace, which is used for high temperature internal friction measurement. Thermal shield for protection of magnets and the sensor was set around the furnace. This system is applied for the measurement of high temperature mechanical spectroscopy of the ceramics. The variable information from the grain boundary was obtained by using newly developed mechanical spectroscopy.