| 摘要 |
A differential dilatometer for simultaneously measuring the relative expansion of two different solid test samples, one of which can be a reference sample. The test sample and the reference are mounted in a support tube and suspended from a head, and the variation in length of the samples is transferred by two push rods connected respectively to the coil and core of a differential transformer. The support tube is inside a cryostat to permit circulation of a cryogenic fluid, during measurements. An electric heating sleeve inside the cryostat provides for further temperature regulation. Both the push rods and the support tube are of vitreous silica. The heating sleeve is supported by the head via thermal insulation, and the head is supported by a vibration absorbing mount.
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