Linear position sensor using a coaxial resonant cavity
US5491422A · kind A · utility
19Cited by
14References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1995 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Mar 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus (102) is for detecting 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.