Device for measuring pressure, variation in acoustic pressure, a magnetic field, acceleration, vibration, or the composition of a gas
US8850893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2008 |
| Grant date | Oct 7, 2014 |
| Priority date | — |
| Expiry date | Feb 6, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0215
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a sensor (1) and a method for measuring pressure, variation in sound pressure, a magnetic field, acceleration, vibration, or the composition of a gas. The sensor (1) comprises an ultrasound transmitter (2), and a cavity (4) arranged in connection with it. According to the invention, the sensor (1) comprises a passive sensor element (3, 3′) located at the opposite end of the cavity (4) to the ultrasound transmitter (2), the distance of which from the ultrasound transmitter (2) is selected in such a way that the resonance condition is met at the ultrasound frequency used, the ultrasound transmitter (2) comprises a light-construction diaphragm oscillator (9), which is thus well connected to the surrounding medium, and the sensor includes means for measuring the interaction between the ultrasound transmitter (2) and the cavity (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.