Using led harmonic wavelengths for near-infrared quantitative
US5218207A · kind A · utility
103Cited by
8References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 22, 1991 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Nov 22, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0621
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A near-infrared quantitative analysis instrument for measuring a constituent of a sample material is disclosed which effectively utilizes energy in the 1200 to 1800 nanometer wavelengths regions by isolating and employing harmonic wavelengths emitted by typical, low cost commercially available light emitting diodes (LEDs) or infrared emitting diodes (IREDs). The analysis instrument utilizes these very desirable wavelength regions for quantitative analysis measurements by interposing suitable narrow bandpass filters which permit passage of only the selected harmonic wavelengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.