Ultrasonic lens cleaning system with impedance monitoring to detect faults or degradation
US10682675B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2017 |
| Grant date | Jun 16, 2020 |
| Priority date | — |
| Expiry date | Sep 4, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60S1/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Lens cleaning systems, drivers and methods to detect faults or degradation in a lens cleaning system, including a controller to control a lens transducer drive signal frequency to vibrate the lens in a frequency range of interest and measure frequency response values according to driver feedback signals, and to compare the measured frequency response values to baseline frequency response values for a healthy system, and to selectively determine the existence of a fault or degradation in the lens cleaning system according to dissimilarities between the measured frequency response values and the baseline frequency response values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.