Patent ID: 8357888
Filing Date: 2013-01-22
Classification: G01J,G01N

Abstract:
1. A photoelectrical feedback sensing system comprising: a light-emitting unit arranged for emitting a first light signal; a sensing apparatus arranged for receiving the first light signal and outputting a second light signal corresponding to a characteristic of a sample within the sensing apparatus; a first photo detector arranged for receiving the first light signal and outputting a first electric signal corresponding to intensity of the first light signal; a second photo detector arranged for receiving the second light signal and outputting a second electric signal corresponding to intensity of the second light signal; a micro-processor arranged for generating a driving signal, being connected to the second photo detector to receive the second electric signal, and converting the second electric signal into a digital signal; and a feedback circuit connected to the light-emitting unit, the first photo detector and the micro-processor to modulate the driving signal for maintaining optical stability of the first light signal.