FPGA オ リヨウシタ ガゾウ ショリ ボード ノ カイハツ

FPGA (Field Programmable Gate Array) is a kind of logic IC, and users can reconfigure its internal circuit. We developed an image processing board by using FPGA. Image data is processed by hardware logic circuits in FPGA, and the circuits are reconfigureble for various image processing algorithms. This paper describes the hardware structure of the board and an application for real time image reversing

Thermoluminescence of chondrules in primitive ordinary chondrites,Semarkona and Bishunpur

The spatial distribution of the induced thermoluminescence (TL) and TL glow curves of the primitive ordinary chondrites, Semarkona (LL3.0) and Bishunpur (LL3.1), were investigated over a wide range of wavelengths using a TL spatial distribution readout system. Although bulk samples of Semarkona and Bishunpur have very low TL sensitivity, individual chondrules show a wide variety of induced TL intensity and glow curve shape. Chondrules with anorthite-normative mesostases have especially high induced TL intensity, and their TL is produced at wavelengths >480nm, compared with <480nm for the sensitivity range of the usual TL measuring systems. Some of the metamorphism-dependent TL sensitivity of type 3 ordinary chondrite therefore results in changes in the spectrum of the light produced