Biological information measuring apparatus
US7569821B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 2008 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | Oct 21, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/3148
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light emission section spread-spectrum modulates a base band signal at a chip frequency f to thereby generate a primary modulated signal, modulates the primary modulated signal at a frequency 2f to thereby generate a secondary modulated signal, and emits a near-infrared light beam having a specific wavelength into a living organism on the basis of the secondary modulated signal. A light detection section receives a reflected light beam from the interior of the living organism in an effective detection band 2f, converts it to an electrical detection signal, and converts the detection signal to a digital signal at a sampling frequency 4f. The light detection section then demodulates the digital signal at the frequency 2f to thereby generate a primary demodulated signal, and demodulates the primary demodulated signal through spectrum despreading to thereby generate a secondary demodulated signal. Thus, a biological information signal representing biological information is output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.