The Development Of The Fiber-based Optical Coherence Tomography

Diabetes and its complications are major threats to human beings. Since thenoninvasive blood glucose detecting technique has many advantages such as freefrom pain and no risk of infection, it brings great improvements in pain relief and thus glucose-concentration monitoring in real time. Because of the strong diffuse properties of the human layered skin tissue, we use dermal difuse reflectance spectroscopy to monitor the glucose. But the skin thickness and optical properties' difference between the different place result in the variety of the optical diffuse character. So it is important to know the tissue optics characters. For its ability of imaging the internal microstructure noninvasively in real time based on the measurement of the echo time delay and magnitude of back-scattered light, Optical Coherence Tomography(OCT) can be very useful in noninvasive blood glucose detecting.This paper introduces the OCT's structure and the theory of its high resolution. The process of OCT building together with the light source, Michelson interferometer, optical heterodyne detection, the Rapid Scanning Delay Line(RSOD) and the system influence factors are discused.The OCT's axial resolution is about 22um, which meets the expect precision through the optimize design and debugging of the optics, electronics, and software module.A lot of works have to be done te meet the demand of the tissue measurement in noninvasive glucose detecting. The system improvement scheme and the application are introduced in the end.