| 摘要 |
A rheometer for studying the elastic properties of a material has two coaxial shafts (23, 29), the mutually adjacent ends of which are provided each with one measuring probe (25, 32) adapted to engage with a sample (P) of the material. One shaft is rotatable and the other is stationary, and at least on the latter magnetoelastic ribbons are fixed whose permeability is changed upon transmission of a rotary force from said rotary shaft to said stationary shaft via the sample between said measuring probes (25, 32). The change in permeability can be read by means of primary and secondary coils surrounding said shaft in a contactless manner and connected to a voltage source and a measuring equipment, respectively. To drive the rotary shaft, use is made of an electric motor (21), but it is also possible to replace the entire shaft by a magnetoelastic tape or rod surrounded by a coil connectible to a voltage and current source. This arrangement can be used also as a stationary shaft for checking the torque thereof. |
