Radio frequency particulate sensing system
US7253641B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2006 |
| Grant date | Aug 7, 2007 |
| Priority date | — |
| Expiry date | Jun 30, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A particulate sensing system for a particulate trap including a radio frequency transmit circuit and a radio frequency receive circuit is disclosed. The transmit circuit may include a wideband signal generator configured to produce a wideband radio frequency signal and a wideband radio frequency amplifier, coupled to the wideband signal generator. The transmit circuit may include a transmit antenna coupled to the wideband radio frequency amplifier and configured to propagate the wideband radio frequency signal through a filter medium. The receive circuit may include a receive antenna configured to receive the wideband radio frequency signal that has been propagated through the filter medium, and a bandpass filter coupled to the receive antenna and configured to limit a frequency range of the received wideband radio frequency signal. The receive circuit may include a radio frequency power sensing device coupled to the bandpass filter and configured to sense a power level of the received wideband radio frequency signal and configured to output a direct current voltage proportional to the total power received across an operating frequency range of the radio frequency power sensing dev…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.