Linear position sensor with means to eliminate spurians harmonic detections
US5325063A · kind A · utility
26Cited by
11References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1992 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | May 11, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/48
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus is adapted to detect the linear extension, velocity and acceleration of a hydraulic cylinder. The hydraulic cylinder defines a variable length coaxial resonant cavity Under the control of a controller, an RF transmitting section and an RF receiving section are used to determine the resonant frequency of the cavity. The receiving section includes a comparator circuit for increasing the sensor's sensitivity and eliminating spurious detections of the cylinder's resonant frequency. The linear extension of the cylinder is determined as a function of the resonant frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.