Pyro/piezo sensor
US6491642B1 · kind B1 · utility
26Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 9, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | May 9, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/0204
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A combination thermal and vibration sensor for use in sleep monitoring equipment comprises a thin film of a plastic exhibiting both pyroelectric and piezoelectric properties. By providing a layer of foam material totally covering one major surface of the plastic film layer, it is found that the thermal mass of the sensor is changed to the point where the pyroelectric signal can more readily be isolated from the piezoelectric signal using conventional signal processing techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.