斩波器，将光依次切换到参比光路和样品光路，四扇区设计可以提供样品测试和参比测试中分别测试暗电流，增加准确性。
Switches between sample and reference beam. Four-segment design provides individual blank readings for sample and reference, increasing measurement accuracy.
斩波器，将光依次切换到参比光路和样品光路，四扇区设计可以提供样品测试和参比测试中分别测试暗电流，增加准确性。
Switches between sample and reference beam. Four-segment design provides individual blank readings for sample and reference, increasing measurement accuracy.
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