System and method for characterizing a sample by low-frequency spectra
US6995558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2003 |
| Grant date | Feb 7, 2006 |
| Priority date | — |
| Expiry date | Jan 9, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/032
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for interrogating a sample that exhibits molecular rotation includes placing the sample in a container having both magnetic and electromagnetic shielding, where Gaussian noise is injected into the sample. An electromagnetic time-domain signal composed of sample source radiation superimposed on the injected Guassian noise is detected, and this signal is used to generate a spectral plot that displays, at a selected power setting of the Gaussian noise source, low-frequency spectral components characteristic of the sample in a selected frequency range between DC and 50 kHz. In one embodiment, the spectral plot that is generated is a histogram of stochastic resonance events over the selected frequency range. From this spectrum, one or more low-frequency signal components that are characteristic of the sample being interrogated are identified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.