Piezoelectric sensor
US5739626A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1992 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Apr 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L23/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved piezoelectric sensor for detecting pressure, vibration, acceleration or the like physical quantity is disclosed. The pressure sensor to be attached to a cylinder block of an internal combustion engine includes a main body adapted to be attached to the cylinder and defining an axially extending hole therewithin, a diaphragm attached to one end of the main body for closing the hole; and a piezoelectric element disposed within the hole so that the pressure within the cylinder is transmitted to the piezoelectric element through the diaphragm. The piezoelectric element is a circular or polygonal disc with a thickness of 0.3-1.5 mm and is formed of a single crystal piezoelectric ceramic having a Curie temperature greater than 500.degree. C., such as LiNbO.sub.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.