| 摘要 |
A controlled-expansion structure has a controlled thermal expansion along a control axis extending between two marker locations over a temperature range. The controlled-expansion structure includes a first expansion element having a first marker location and a first contact surface, the first expansion element having a first coefficient of thermal expansion; and a second expansion element having a second marker location and a second contact surface. The second expansion element has a second coefficient of thermal expansion different from the first coefficient of thermal expansion. The controlled-expansion structure further includes a freely movable interface formed by a contact between the first contact surface and the second contact surface. The interface is oriented at an interface angle relative to the control axis of greater than 0 but less than 90 degrees.
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