Method for investigating a scattering medium with intensity-modulated light
US5713352A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1995 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Dec 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/49
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns a method for investigating a scattering medium, especially a biological matrix, with intensity-modulated light. In order, in such a frequency-domain measuring procedure, to reduce the expenditure on electronics without restricting accuracy of measurement, a method is proposed, in which, in order to investigate a scattering medium, especially a biological matrix, with intensity-modulated light, a high-frequency modulation signal is generated by a frequency generator (18), the intensity of a light emitter (10) is modulated with a modulation signal and the light from the light emitter (10) is radiated into the medium, the modulation signal includes frequency chirps during which the modulation frequency is tuned from an initial frequency to a final frequency, the modulation signal is delivered from the frequency generator (18) via at least two different signal paths (23A, 24) to a signal mixer (31), so that during a frequency chirp the input signals of the signal mixer (31) differ by a differential frequency whose magnitude is a function of the difference between the signal transit times over the at least two signal paths (23A, 24) and of the rate of change of th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.