研究了一种简单机械结构的周长和面积测量仪原理,并对其做了理论推导。其测量采用变换器原理,从而使得测量方法变得简捷,简单的数据记录方法精确、实用、有效。该理论推导为其实际运用打下理论基础。 The principle of perimeter and area measuring instrument with a simple mechanical structure was studied and the theory deduced. The measurement uses the transducer principle, which makes the measurement method simple and straightforward, and the simple data recording method is accurate, practical and effective. The theoretical derivation laid the theoretical foundation for its practical application.