中文摘要：

针对目前《微弱信号检测》课程存在的实验资源有限和设备维护要求高的问题，提出了采用虚拟仪器技术与实验相结合的教学模式．该文以微弱信号检测技术中最重要的锁相放大器为例，利用LabVIEW软件设计了一种虚拟锁相放大器，通过对虚拟锁相放大器的学习，一方面可以让学生更好地掌握锁相放大器的结构和原理；另一方面熟悉虚拟仪器编程技术，了解虚拟锁相放大器的构建过程，通过自己动手开发虚拟锁相放大器，为下一步实验做好准备．

英文摘要：

To solve the problem of limited experimental resources and high equipment maintenance require- ments in the weak signal detection course, a combination of virtual instrument technology and experimental teach- ing mode was proposed. In this paper taking the lock-in amplifier which is the most important technology of the weak signal detection as an example, a virtual lock-in amplifier was developed using LabVIEW. With the virtual lock-in amplifier, students can master the structure and principle of the lock-in amplifier, furthermore they can be familiar with virtual instrument programming techniques and virtual lock-in amplifier building process by them- selves to develop a virtual lock-in amplifier and prepare for the next experiment.