Method for measuring oscillation frequency of a fluid jet in a fluidic oscillator
US6606915B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 2002 |
| Grant date | Aug 19, 2003 |
| Priority date | — |
| Expiry date | Aug 20, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/3273
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The oscillation frequency of a fluid jet in a fluidic oscillator is measured using a temperature sensor. The resistance of the temperature sensor varies as a function of the oscillation of frequency f0 of the jet. The method consists in feeding the temperature sensor with an AC voltage of frequency f, and then in determining the frequency components around the frequency 3×f in the output signal from the temperature sensor in order to determine the oscillation frequency f0 of the jet. The frequency components in the signal output by the temperature sensor are determined by measuring the measurement signal across the terminals of the temperature sensor, then by synchronously demodulating the measurement signal at the frequency 3×f, and finally by determining the frequency of the demodulated measurement signal, which frequency corresponds to the oscillation frequency f0 of the jet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.