The Study On A 3D Colour Wild-Field Optical Coherence Tomograpgy System And Its Properties

Optical coherence tomography(OCT) is a non-immersion new optical diagnosis three dimensional reconstruction imaging technology which be can used for biological tissue and various materials. Wide Field optical coherence tomography(WFOCT) is an extention for the traditional OCT, whaterever system in OCT sample's nature colors are neglected and its pseudo-color images are obtained by image processing. Actually the information contained in a nature color image is more rich than that in a pseudo-color image with higher fidelity. It could provide more useful information for a professional medical diagnosis and other optical detections.Based on WFOCT technology, an color imaging method is proposed and a 3D WFOCT system is constucted. Three primary colors lights filtered out from broadband white source are used as light source. Three primary color images of a sample are obtained respectively using the primary color lights. A nature color image of the sample is synthesized by imaging processing. Prgram pertinent to the control uint in the system are designed, Which can implement auto filter selection, image acquisition, axial scanning. Imaging processing in the system has fulfilled sample's sectional image reconstruction, sample's nature color image synthesization with the primary color images and sample's 3D image rebuild. Using the method, The color imaging mechanism has been studied and the imaging using white light has been simulated, which are the foundation for directly obtaining color images using white light later.Using the 3D colore WFOCT system, correlative experiments have been carried out with glass slides,plastic surfaces and coin surfaces as samples. Corresponding monochromatic and color images have been acquired. Experimental results indicate that some transparent media and high reflection factor color samples could be imaged using this system.Finally the system performance has been investigated and tested. Influence factors effecting on system transverse resolution, axial resolution as well as imaging speed have been analyzed. The initial theoretical values and observed values of the system properties have been obtained. Influences on the system imaging by platform oscillation or vibration and experimental environments have been analyzed emphatically. Interference effects in the system with monochromatic light are simulated using ZEMAX software. By the experimental and emulational results, experimental conditions are given for acquiring a clearer sample image with a higher resolution.