Optical analyzer
US9877368B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2016 |
| Grant date | Jan 23, 2018 |
| Priority date | — |
| Expiry date | Apr 17, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0695
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Provided is an optical analyzer for performing a feedback control on the amount of light emitted from an LED as a light source, in which the configuration of an optical system is made simple and the degree of freedom in optical system arrangement is secured. An optical member 2 for focusing most of light while discharging part of the light as unfocused light is provided on an optical path from a light casting unit 1 to a sample cell 3. The optical member 2 can be achieved with a simple configuration, for example, two ball lenses spaced apart by a predetermined distance from each other. The light focused by the optical member 2 is cast as measurement light into the sample cell 3. Meanwhile, a second photodetector 5 is arranged at a position where the unfocused light reaches. The second photodetector 5 generates a detection signal in accordance with the amount of light that has entered the second photodetector 5 as monitored light, and a drive current to be supplied to an LED is controlled through a drive current controlling unit 6 and a current source 7 such that the amount of light is maintained at a fixed level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.