Portable acoustic intensity measuring device
US4620445A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1984 |
| Grant date | Nov 4, 1986 |
| Priority date | — |
| Expiry date | Oct 19, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H3/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A portable acoustic intensity measuring device comprising a pair of electroacoustic transducers at a positioned predetermined distance from one another. The measuring device utilizes analog summing, subtraction, integration and multiplier means for measuring an acoustic intensity vector midway between the two electroacoustic transducers. The acoustic intensity measuring device further comprises error correction means connected in circuit with a preamplifier means and a meter means. The error correction means includes switching means comprising a first switch connected in circuit with the preamplifier and summing means and subtraction means and a second switch connected in circuit with the multiplier and the meter for simultaneously switching the first and second preamplified analog signals at the summing input and subtraction input and for simultaneously switching the polarity of the acoustic intensity signal at the meter. The error correction means eliminates any errors induced by phase mismatch and/or any inherent DC component of the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.