UHT纸盒奶检测仪是基于流体力学的运动原理,利用电子、物理方法设计研制的,适用于不同砖型纸盒包装的超高温灭菌牛奶产品的虚拟检测仪器。本文介绍了在UHT纸盒奶检测仪中,在LabVIEW环境下,如何使用USB接口的数据采集卡,进行数据采集以及控制步进电机。通过试验证明该系统达到了设计要求。 UHT carton milk detector is based on the principle of fluid dynamics, the use of electronic and physical methods designed for different brick-shaped carton packaging of ultra-high temperature sterilization of milk products, virtual test equipment. This article describes how to use the data acquisition card of the USB interface for data acquisition and control of stepper motors in a UHT carton milk detector in a LabVIEW environment. The experiment proves that the system meets the design requirements.