摘? 要: 介紹了一套最新研制的功率計" title="功率計">功率計" title="光功率" title="光功率">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" 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title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" 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title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計" title="光功率計">光功率計">光功率計自動測試系統(tǒng)，該系統(tǒng)充分利用了計算機(jī)的現(xiàn)有資源，具有投資省,、自動化程度高等特點(diǎn),。對于利用計算機(jī)進(jìn)行數(shù)據(jù)采樣、實(shí)時通信、自動控制等應(yīng)用具有一定的參考價值。

　　關(guān)鍵詞: 光開關(guān)" title="光開關(guān)">光開關(guān)? 接口技術(shù)? 自動測試?

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　　光功率計是現(xiàn)代光通信中最基本的光纖測試儀器。隨著寬帶通信技術(shù)的快速發(fā)展,，通信網(wǎng)絡(luò)中大量使用光纖作為傳輸介質(zhì)，因此光功率計也就越來越多地被應(yīng)用于科研,、生產(chǎn)的各個部門,。對于計量檢測部門而言,，每年都要計量大量的光功率計，然而傳統(tǒng)的計量方法耗時長,、效率低,，計量的準(zhǔn)確性也極易受人為操作的影響。在這里我們介紹一套最新研制的光功率計自動測試系統(tǒng),，具有測試準(zhǔn)確性高,、投資省、自動化程度高等特點(diǎn),。

1 傳統(tǒng)光功率計的測試方法

　　傳統(tǒng)的光功率計測試框圖如圖1所示,。

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　　所用測試原理為比較法。首先將光衰減器" title="衰減器">衰減器與標(biāo)準(zhǔn)光功率計連接起來,，測試光從光源發(fā)出,，經(jīng)過衰減器后被標(biāo)準(zhǔn)光功率計讀出的數(shù)值為標(biāo)稱值。接著將光纖從標(biāo)準(zhǔn)光功率計上取下切換到待測光功率計上,，再測量待測光功率計讀出的數(shù)值,，該值為實(shí)測值。測試完第一個光功率下的數(shù)值后,，調(diào)節(jié)光衰減器使輸出光功率為下一值,，重復(fù)以上步驟進(jìn)行下一次測試。待所有光功率量程都測完后,，通過計算待測光功率計的相對誤差對其進(jìn)行標(biāo)定,。計量評定標(biāo)準(zhǔn)是:相對誤差在±10%以內(nèi)，待測光功率計標(biāo)定為合格,，超過這一范圍則為限用,，需重新校準(zhǔn)后才能使用。

　　測試時必須注意兩點(diǎn):①用光纖連接光器件時,，盡量旋緊光接頭以避免由于接入損耗而降低測量的準(zhǔn)確性;②為了將測試誤差降至最低,，在每一次光功率的測試過程中，需采用平均值測試法,，即在相同光功率下進(jìn)行多次的重復(fù)測試，然后去掉一個最大值和一個最小值,，再將其它數(shù)值取平均即為該光功率下最終的測試數(shù)值,。

　　采用以上方法進(jìn)行實(shí)際測試時，調(diào)節(jié)光衰減器,、切換光纖,、記錄測試數(shù)據(jù)、計算相對誤差等均需手工完成,，工作效率低下,。在測試過程中由于不斷地進(jìn)行光纖的切換工作,，使得接入損耗嚴(yán)重影響測試的準(zhǔn)確性。雖然測試人員可以旋緊光接頭以降低接入損耗,，但由于光信號本身非常弱,，將光纖反復(fù)多次地插入和拔出，會造成接入損耗有很大不同,，直接降低測試的準(zhǔn)確性,。

　　經(jīng)過以上分析發(fā)現(xiàn)，造成工作效率低下和測試準(zhǔn)確性低的主要原因是由于所有的測試工作均需人工完成,。解決這一問題的最好辦法就是采用計算機(jī)進(jìn)行自動化測試,。新的自動測試系統(tǒng)框圖如圖2所示。

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2 自動測試系統(tǒng)硬件設(shè)計

　　使用計算機(jī)進(jìn)行自動控制時,，在滿足功能的前提下應(yīng)該最大限度地利用計算機(jī)現(xiàn)有的資源,。這樣，一方面可以充分發(fā)揮計算機(jī)的作用,，另一方面也可以節(jié)省另外制作控制板卡所需的資金,、器材、時間和人力,。

　　在這套自動測試系統(tǒng)中,，光衰減器帶有串行接口，可直接與計算機(jī)通信,。待測光功率計中,，較新的帶有串行接口和GPIB接口，老一些的只有GPIB接口,。為了滿足兼容性和自動控制的要求,，增加了一塊基于計算機(jī)總線的GPIB接口卡，通過該卡控制待測光功率計,。標(biāo)準(zhǔn)光功率計自帶串行和GPIB兩種接口,，可通過任意一個接口與計算機(jī)通信。由于計算機(jī)上有兩個串行接口,，因此可分別通過這兩個接口控制光衰減器和標(biāo)準(zhǔn)光功率計,。為了解決接入損耗問題，系統(tǒng)增加了一個1×2的光開關(guān),。光開關(guān)的作用就是在計算機(jī)的控制下,，自動切換光纖，將接入損耗的影響降至最低,，類似于電子開關(guān)在電路切換中所起的作用,。我們利用計算機(jī)的并行接口對光開關(guān)進(jìn)行控制。

　　光開關(guān)采用電壓控制方式,，需自制一塊控制卡,，利用計算機(jī)的并行接口進(jìn)行控制,。控制卡的電路如圖3所示,。

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　　光開關(guān)由計算機(jī)的并口發(fā)控制信號進(jìn)行驅(qū)動,，即從計算機(jī)并口378H的“0”、“1”兩端發(fā)送高低電平信號,，使得控制電路A,、B兩端的電壓交替變化，達(dá)到光開關(guān)自動動作的目的,。當(dāng)“0”端為高電位時,，三極管Q3、Q4導(dǎo)通,，Q1,、Q2截止;同時“1”端為低電位，Q5,、Q6導(dǎo)通,，Q7、Q8截止,，這樣就構(gòu)成了導(dǎo)通回路+12V→Q6→B→A→Q3→GND,，則光開關(guān)向右運(yùn)動。同理,，“0”端為低電位而“1”端為高電位時,，光開關(guān)向左運(yùn)動。二極管D1~D4為保護(hù)二極管,，可避免光開關(guān)中的感性元件在極性切換時造成反向電壓而損壞功率三極管,。

3 自動測試系統(tǒng)軟件設(shè)計

　　自動測試系統(tǒng)軟件由系統(tǒng)自檢、硬件控制,、測試數(shù)據(jù)記錄及計算,、測試結(jié)果輸出等部分組成，其中最為關(guān)鍵的是硬件控制部分的程序,。下面重點(diǎn)介紹一下該部分的并,、串口控制程序以及GPIB接口程序的編寫方法。這些程序全部采用C++ Builder(簡稱BCB)編寫,，運(yùn)行在WIN9x操作系統(tǒng)下,。

3.1 光開關(guān)控制程序設(shè)計

　　光開關(guān)的控制程序采用直接嵌入?yún)R編語句的方法實(shí)現(xiàn)，程序如下:

　　void outportb(unsigned short port,，unsigned char value)

??? //port參數(shù)為輸出端口地址，value參數(shù)為輸出值

????{

??????? asm{

??????????? mov dx,， port?? 　　//把端口port地址送到DX寄存器中

??????????? mov al,， value? 　　//把value的數(shù)值送到AL寄存器中

??????????? out dx,， al???????? //把AL寄存器中的數(shù)值送到端口

　????????? }；

??? }

　　光開關(guān)的控制程序如下:

　　#define? PC 0x378??????????//PC機(jī)的并口地址

　　void_fastcall TForm2：：BitBtn_Left2RightClick(TObject *Sender)

??? {

　　outportb(PC,，0x01),；?????? // 378H的“0”端為高電位，“1”端為低電位,，光開關(guān)向右運(yùn)動?

??? }?

　　void_fastcall TForm2：：BitBtn_Right2LeftClick(TObject *Sender)

??? {

　　outportb(PC,，0x02)；?? 　　// 378H的“0”端為低電位,，“1”端為高電位,，光開關(guān)向左運(yùn)動?

????}

　　采用以上方式編制的程序可以非常方便地對原有的采用匯編語句編制的函數(shù)直接進(jìn)行使用，不需再另外編制相應(yīng)的程序,。

3.2 串行接口程序設(shè)計

　　我們使用Microsoft的MSComm32.ocx控件來編寫串行通信程序,。首先要進(jìn)行串口初始化，程序如下:

　　{

　　……

　　Mscomm1→CommPort=1,；????? 　　//選用COM1串行口

　　Mscomm1→Settings=″9600,，N，8,，1″,；??

　　//波特率9600，無奇偶校驗(yàn)位,，8位數(shù)據(jù)位,，1位停止位

　　Mscomm1→InputLen=0????? 　　　//讀取接收緩沖區(qū)的全部內(nèi)容

　　Mscomm1→InBufferSize=1024 　　//設(shè)置接收緩沖區(qū)的字節(jié)長度為1024

　　Mscomm1→PortOpen=True??? 　　 //打開串行口

　　……

　　}

　　串口初始化后就可以利用Input函數(shù)讀取標(biāo)準(zhǔn)光功率計的讀數(shù)了。通過串口1讀取標(biāo)準(zhǔn)光功率計讀數(shù)的程序如下:

　　{

　　　　double? buffer[1024],；????? //定義接收數(shù)據(jù)的緩沖區(qū)

　　　　int? ByteNum,；?????? ?????? //收到的字節(jié)數(shù)

　　　　int? BuffPtr；???????? ???? //接收緩沖區(qū)的指針

　　　　OleVariant? RxBuff,；????????//一個用于接收的OleVariant變量

　　……

　　if(MSComm1→InBuffCount>0)? //如果緩沖區(qū)有多于一個字節(jié)的數(shù)據(jù)則接收

??????? {

??????? RxBuff=Communica1->Input,；?????????

??????? ByteNum=RxBuff.ArrayHighBound(1)； //將實(shí)際的字節(jié)數(shù)取出

　　??????? for(int i=0,；i<=ByteNum,；i++)

??????????? buffer[BuffPtr++]=(double)RxBuff.GetElement(i)；

????　　　　　　　　　　???????????????? ?//將接收到數(shù)據(jù)讀入緩沖區(qū)

????????　　}

　　　　……

　　}

　　光衰減器的自動控制程序與此類似,，本文不再復(fù)述,。

3.3 GPIB接口程序設(shè)計

　　GPIB接口程序是使用NI公司的ActiveX控件編制的，方法如下:

　　打開BCB的ActiveX控件組,，將GPIB控件拖放到Form上,，在“Object Inspector”表框中對通信的時間間隔、目標(biāo)地址,、起始位,、校驗(yàn)位,、存放數(shù)據(jù)的緩沖區(qū)大小等進(jìn)行設(shè)置。

　　完成了以上設(shè)置后,，在程序中只要加上不多的幾行代碼即可實(shí)現(xiàn)待測光功率計的自動數(shù)值采樣,。程序代碼如下:

　　{

　　　　……

　　　　double? number;

　　　　Form2→CWGPIB1→Configure()； //初始化GPIB接口卡

　　　　……

　　　　number=Form2→CWGPIB1→Read (),；?? //自動讀取待測光功率計的讀數(shù)

　　　　……

????}

4 自動測試結(jié)果

　　利用以上自動測試系統(tǒng)測出的某一待測光功率計的計量標(biāo)定參數(shù)如表1所示,。?

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　　從以上測試數(shù)據(jù)來看，該待測光功率計在1.3μm測試波長下,，mW,、μW量程為合格，而nW量程為限用,，必須重新校準(zhǔn)后才能使用,，或僅用于指示光纖中有無光功率的一般性使用。

　　在這套光功率計自動測試系統(tǒng)中,，測試軟件采用圖形化操作界面,，每一步的操作都有直觀的提示，可使測試人員在很短的時間內(nèi)掌握系統(tǒng)的使用方法,。測試時,，測試人員只要將整個測試系統(tǒng)連接起來，然后正確地使用測試軟件即可,，其它的操作,，如光衰減器的調(diào)節(jié)、光纖的切換,、測試數(shù)據(jù)的輸入與計算,，以及最終測試結(jié)果的輸出全部由計算機(jī)完成。這使得整個測試工作的準(zhǔn)確性和靈活性都得到了加強(qiáng),，工作效率大為提高,，也極大地增強(qiáng)了測試的自動化水平和使用檔次。

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2 NI-488.2 User Manual for Windows[M]. National Instruments Corporation,，1998

3 FlUCK AT900型可調(diào)諧光濾波器使用手冊[M].美國FLUCK，1999

4 徐新華. C++ Builder 4 編程指南[M]. 北京：人民郵電出版社,，1997.10

5 姜 勇.微型PC機(jī)接口技術(shù)[M]. 西安：西北工業(yè)大學(xué)出版社,，1996.4