介绍一种支持可编程序控制器（PLC）的温度、电流和电压数据采集模块。该模块采用隔离标准异步输出接口，设计适合PLC开关量输入采集数据的时序。使用隔离、数字校零、软件滤波和看门狗等技术保证模块运行的稳定性和可靠性。由软件选择传感器类型，支持常用各种型号的热电阻、热电偶、电流和电压等。温度线性化采用分段4次拟后算法，所有传感器的全温度范围精度优于0.1℃。

This paper introduces the system of measuring the same state of temperature based on multisensor. Multisensor is connected with host computer through DUT series data acquisition module and RS485 to RS232 convertor. Comparing with the result of single sensor, more accurate estimation of temperature state is achieved by processing the data of multisensor based on data fusion.

Abstract: In weighted fusion algorithm for multisensor, the weights are only determined by noise variance and the precision of the variance estimation will affect the performance of the fusion algorithm. An approach of variance estimation for multisensor is presented and proves unbiased in this paper. The recurrence formula for the algorithm is also proposed, and moreover, there is no need for initial values, for which the approach is adaptive and can be used in real-time estimation. A numerical example is given to show the usefulness of the approach. Copyright