System and method for characterizing a sample by low-frequency spectra
US7081747B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2004 |
| Grant date | Jul 25, 2006 |
| Priority date | — |
| Expiry date | Jan 13, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N37/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for interrogating a sample that exhibits molecular rotation are disclosed. In practicing the method, the sample is placed in a container having both magnetic and electromagnetic shielding, and 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 cross-correlated with a second time-domain signal produced by the same or similar sample, to produce a cross-correlated signal with frequency domain components. The latter is plotted in the frequency domain by a fast Fourier transform to produce a frequency domain spectrum in a frequency range within DC to 50 KHz. 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.