Instrument with colorimeter and sensor inputs for...

Details Instrument with colorimeter and sensor inputs for... Instrument with colorimeter and sensor inputs for...

2006-05-16

2006-05-16

Evans, F. L. (Department: 2877)

Optics: measuring and testing

Plural test

C356S338000, C356S402000

Reexamination Certificate

active

07046347

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.

REFERENCES:
patent: 3553462 (1971-01-01), Johnson
patent: 5140168 (1992-08-01), King
patent: 5313267 (1994-05-01), MacFarlane et al.

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