Instrument with colorimeter and sensor inputs for interfacing with a computer
US7046347B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Mar 29, 2002 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Jun 19, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/0291
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An array of multiple light-emitting diodes each having a different wavelength are equally spaced around a tubular sample holder facing inwardly. A photo-diode light sensor that detects light transmitted through the sample is mounted to the tubular sample holder at a position directly opposite each light-emitting diode. By selectively turning on one of the LED's and selecting the associated photo-diode exactly opposite it, the light transmission through a solution can be ascertained. A computer is then used to plot the transmission and absorption on a graph for each of the different wavelengths. The circular array of sensors and LED's results in one sensor directly opposite each LED, one sensor off-axis on either side in the forward scatter direction, and one sensor off-axis on either side in the back scatter direction. The combination of back-scattered light and forward-scattered light and transmitted light permits measurements of the turbidity of the sample solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.