Armitage P R, Wright C D
Theta Technologies Ltd., The Innovation Centre, University of Exeter, Exeter EX4 4RN, England.
Rev Sci Instrum. 2010 Oct;81(10):106109. doi: 10.1063/1.3495964.
The design of a simple, robust, low-cost, and bidirectional displacement sensor with subangstrom resolution is described. A small gold plate is attached to the object, whose displacement is to be measured, and a small gold tip is brought into contact with the plate, establishing a reference current between the two. Movements of the gold plate away from the tip lead to a change in the tip-plate current; the reference current is then re-established by moving the tip using a simple magnetic actuator. The resolution of the sensor has been calibrated using an interferometer and was shown to be as high as 0.3 Å per system count. Potential applications of the sensor are numerous, including microbar air pressure measurement, motion and infrasound detection, thermal sensing, and gravitational field and relativistic gravity wave measurement.
本文描述了一种设计简单、坚固、低成本且具有亚埃分辨率的双向位移传感器。将一个小金板附着在待测量位移的物体上，并使一个小金尖端与该金板接触，从而在两者之间建立参考电流。金板远离尖端的运动会导致尖端 - 金板电流发生变化；然后通过使用简单的磁致动器移动尖端来重新建立参考电流。该传感器的分辨率已使用干涉仪进行校准，结果表明每个系统计数高达0.3 Å。该传感器的潜在应用众多，包括微巴气压测量、运动和次声检测、热传感以及引力场和相对论引力波测量。
