第三章对此磁致偏振特性测量系统的搭建及工作原理（消光法）、影响测量结果的因素及解决方法、实验操作步骤等作了说明。

So the third chapter focuses on the measuring system. The operating principle (Light extinction method), the factors which influence the result and the resolvent to avoid them are explained.

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介绍了多波长消光法测尘的测量原理。分析了计算机辅助粉尘检测系统和工作原理。

A multi-wave-length extinction detection method for dust is put forward. Then the principle and a principal designing scheme are given.

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