Apparatus for measuring displacement by variation in frequency of an oscillator.
摘要
<p>A measuring head (1) measures displacement by variation in frequency of an oscillator due to movement of a core in a coil. The signal from the oscillator is used to gate a high frequency crystal clock (10) into a counter (12). The count is representative of the change in frequency of the oscillator and thus the displacement to be measured. The count is compared by a microprocessor (14) with a look-up table (16) stored in the memory during initial calibration. The operating and processing electronics connected to the sensor head (1) are mounted in a connector which can be directly coupled to connectors of other sensors to form a bus connecting multiple sensors to a host. <IMAGE></p>
申请公布号
EP0549285(A2)
申请公布日期
1993.06.30
申请号
EP19920311610
申请日期
1992.12.18
申请人
SCHLUMBERGER INDUSTRIES LIMITED
发明人
KUC, STEPHEN TONY;WELLER, DOUGLAS DENNIS;LEWIS, ADRIAN VIVIAN;SNOAD, KEVIN ANTHONY;BURRIDGE, ROBERT STUART