Engine detonation sensor with double shielded case
US4096735A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1977 |
| Grant date | Jun 27, 1978 |
| Priority date | — |
| Expiry date | Sep 1, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/223
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detonation sensor adapted for mounting on a vehicle engine component has a cylindrical outer case with an open end. An inner cylindrical case has an open end facing in the opposite direction as that of the outer case and is so disposed coaxially within the outer case that it is held slightly axially separated therefrom by at least one rod of a magnetostrictive material and a magnet axially in line therewith. The edges of the open end of the outer case are crimped over a washer which abuts the closed end of the inner case to exert an axial stress on the magnetostrictive rod. Axial mounting means are provided on the outer case; and a pickup coil surrounds the magnetostrictive rod within the inner case. Both inner and outer cases are formed from a magnetic material to shield the coil from external electromagnetic signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.