JISに準じたI.I.の相対変換係数の測定

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  • Study on Measurement Conformity to JIS of Relative Conversion Factor in Image Intensifier

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Relative convertsion factor(Gx)measurement with certain reappearance is necessary for the management of fatigue over the course of time in an image intensifier(I.I.). Therefore it is desirable to make the measurement method as close as possible to the Japanese Industrial Sandards(JIS). We studied a relative Gx measurement method on the premise that it is done by the user. Study of both output luminance and exposure rate indicated that Gx depends on radiation quality. The exposure rate increased by up to about 10% as a result of back scatter from the I.I. when measuring. We measured luminance through the first lens because it is difficult to measure I.I. output fluorescence by output luminance. When the distance between first lens and the luminance meter is within 30cm to 120cm, output luminance is not influenced by measurement distance. When measuring reflection luminance from the distributor mirror, we must pay attention to the distribution rate. A luminance measurement area within the cine iris diameter makes it possible to measure from the cine camera output.

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