Focus on challenging optical components


Role of Optical Coherent Tomography (OCT) for

by:ChangHui     2020-04-30
In the modern digital age, Biometric Identification has replaced all other protection security system like password, photo identity card. There are various methods of biometric recognition. Fingerprint recognition is the most popular among all the biometric recognition techniques. The following features are the advantage of the fingerprint identification. The fingerprint of a person remains the same throughout the life. The fingerprint of any two people cannot be identical. The result is very fast and accurate. The device is cost effective and portable. However, artificial finger is the potential threat to Fingerprint verification. Fake finger can be made in home using very low cost materials like gelatin and gum. It can easily fool the fingerprint scanner. During the last few years, the diligent efforts of the scientists have improved the robustness of the fingerprint scanners. One of the major achievements is the application of Optical Coherent Tomography (OCT) to identify the dummy fingerprint. The basic principle of Tomography is imaging the tissue structure of human body or other solid objects using low energy visible light. Optical Coherent Tomography (OCT) is an improved version of Tomography. It is a noninvasive technology to get a high resolution cross-sectional image of human tissues. Initially, the technique was used to measure the retinal nerve fiber layer thickness for the treatment of glaucoma and other diseases of eye nerve. The technology has now used in various fields of medical science, like clinical diagnostics and biometrical identifications. Two Scientists, Satish Kumar Dubey and Dalip Singh Mehta from Indian Institute of Technology, have developed a portable device that can identify the artificial finger. The system works using Optical Coherent Tomography (OCT). There are two steps of Optical Tomography. One is forward problem and the other is inverse problem. The main task of the forward problem is to explore and analyze the optical properties of the object. The inverse problem mathematically measures the properties of the object and filter out the undesired reflections. Low coherence infrared rays from a source passes through a beam that scatter the infrared particles and scattered rays propagate through the tissues of human body and returns with the image of precise measurements of displacement lengths in terms of the wavelength. The system provides high in-depth resolution and real time image of the object. In case of false finger, the technique detects the extra layer of foreign materials placed on the fingers analyzing the optical properties of the object. According to the forensic experts, OCT provides 3D image with better sensitivity and clarity. Therefore, identifying the artificial figure has become easier than the conventional technique of chemical processing to enhance the contrast of image. For more information, visit Fingerprint Scanner.
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