Proximity detector
US11099122B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2020 |
| Grant date | Aug 24, 2021 |
| Priority date | — |
| Expiry date | May 16, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A proximity detector includes a sensor providing a proximity reading. The proximity detector is capable of comparing the reading to a rising threshold level and a falling threshold level, wherein the falling threshold level is less than the rising threshold level. The proximity detector filters the proximity reading through three low pass filters using a three different time constants to generate three filtered readings. While the proximity detector is in the no material present state, the proximity detector will enter the material present state when the second filtered reading is less than the difference between the first filtered reading and the falling threshold. While the proximity detector is in the material present state, the proximity detector enters the no material present state when the third filtered reading is greater than the sum of the first filtered reading and the rising threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.