Method of and apparatus for in-situ measurement of changes in fluid composition by electron spin resonance (ESR) spectrometry
US7868616B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2007 |
| Grant date | Jan 11, 2011 |
| Priority date | — |
| Expiry date | Nov 26, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P7/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A miniaturized instrument and method of using electron spin resonance spectrometry for measuring the degradation of lubricating fluids, and the like, that includes continuously passing a sample of such fluid through a resonating RF microwave cavity resonator during the application therethrough of a uniform slowly varying uniform magnetic field that is rapidly modulated and measuring the resulting phase modulation or amplitude modulation thereof to derive an electron spin resonance signal that directly senses the molecular changes in the fluid sample resulting from fluid degradation during operation of the vehicle, such as peroxy radicals in vehicle engine oil and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.