FIRST PROPOSAL: ULTRA-FAST FIBER OPTIC DIGITAL IMAGING SYSTEM
Shyam Sunder Tiwari Safety Research & Health Physics Group Indira Gandhi Centre for Atomic Research Kalpakkam 603 102, Tamil Nadu, India
Keywords: Digital imaging, Ultra fast Fibre optic rapid image acquisition, optical fibers, NDT
ABSTRACT
We have designed a model scheme for the proposed ultra fast fiber optics based digital imaging system under indigenous technology development for NDT applications. System is for rapid image acquisition at a rate of one million frames per second and in future can be upgraded to a much higher image acquisition rate of ten million frames per second. System consists of mainly two parts; (I) optical assembly which consists of focusing lenses, and optical fibers, (ii) detector electronics and image acquisition hardware. Image frame consists of 625 pixels and needs equal number of optical fibers are detectors. Light detectors are ultra fast charge injection devices (CID) having response time less than 100 ns. Each image acquisition channel associated with individual pixel is independent, modular, and consists of optical fiber, CID detector, charge amplifier, signal filter, AGC, linear to log converter, 8 bit flash ADC, fast bit slice microcontroller with 32000 bytes of nonvolatile data storage memory. Core high speed state machine is used to control the image acquisition modules and to transfer image data to PC. At present our model scheme is designed for one stroke acquisition of 32000 image frames spaced at 1 mirosecond intervals. About 20 M byte space on the permanent storage media (hard disk) in PC is required to store the entire data from 32000 image frames storage of the image acquisition system.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.full paper not received Publisher:Ashgate Publishing Company
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