Patent ID: 8357918
Filing Date: 2013-01-22
Classification: G01N

Abstract:
1. An apparatus for analyzing a fluorescent sample disposed on a substrate, the apparatus comprising: a first processor for producing a first electrical signal derived from a first light signal component from the sample and a second electrical signal derived from a second light signal component from the substrate, wherein the apparatus is arranged to produce the first and second electrical signals such that there is a phase difference between phases of the first and second electrical signals; and a control circuit for producing an attenuation signal for attenuating the second signal, wherein the control circuit comprises a first phase generator and a variable gain module, the first phase generator being arranged to set a phase of the attenuation signal and the variable gain module being arranged to set an amplitude of the attenuation signal, the control circuit being arranged for the attenuation signal to cancel or cancel substantially the second electrical signal.