Linear position sensor using a coaxial resonant cavity
US5438274A · kind A · utility
27Cited by
15References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1991 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Dec 23, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus (102) is adapted to detect the linear extension (position), velocity and acceleration of a hydraulic cylinder (108). The hydraulic cylinder (108) defines a variable length coaxial resonant cavity (112). Under the control of a controller (228), an RF transmitting section (114) and an RF receiving section (116) are used to determine the resonant frequency of the cavity. The resonant frequency of the cavity (112) is determined by comparing a received signal with a threshold and detecting slope intercept conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.