Interrogation method for passive sensor monitoring system
US7065459B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2002 |
| Grant date | Jun 20, 2006 |
| Priority date | — |
| Expiry date | Aug 23, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0675
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method of determining the frequency of a plurality of resonant devices (for example three SAW devices) includes determining optimal interrogation frequencies for each of the devices, the optimal interrogation frequencies having maximum power spectral densities, accumulating a plurality of responses for each sensor, performing discrete Fourier transforms on the sampling results to estimate the three resonant frequencies, and averaging the results of the Fourier transforms to provide an indication of resonant frequencies. The averaging step may include the calculation of a standard deviation and the rejection of any results which fall more than a pre-determined multiple of the standard deviation from the average frequency result. The frequency determined by the method may be employed to calculate the pressure and temperature of the sensor devices. The sensor devices may be located in a vehicle tire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.