Wireless transmission of shape signals, which transmit signals from inside the measuring roller to the outside receiving set by infrared, is implemented by the design of dynamic measurement device and dynamic measurement circuit, which overcomes a lot of shortcomings caused by slip-ring devices used before. 动态检测装置及动态检测电路的设计实现了板形信号的无线传输,即信号通过红外发送的方式从检测辊内传送到外部的接收装置,克服了以往所使用的滑环装置的诸多弊端。