Resonant Amplification of the Probing Signals in Optical Coherence Tomography (OCT)

摘要

Optical coherence tomography (OCT) is a method of high-resolution imaging originally developed for the transparent tissue of the eye. Recently, the technology has been advanced to such an extent that imaging of nontransparent tissues has become feasible as well. However, new challenges have surfaced: one of them-detection of the weak signal with high intensity background noise. The common approach of using Lock-in amplifiers (as well as some other techniques proposed) is not sufficiently effective or not effective at all. A solution to this problem has risen in the form of a resonant amplifier when the frequency of the response is known. The principle of such an amplifier and its application are discussed below.