Digital-speckle-pattern interferometer (DSPI) is a wide-used technology in fined-measure. Nowadays common DSPI system employs high-power laser source and great experimental facilities, which is only suitable for lab research work. In order to extend its application into fieldwork, a new optical layout for portable DSPI meter is proposed in this paper, which is suited for low-power laser and has some advantages such as optimized compact framework and small size, Driven by a He-Ne laser of 5 mW output power, it shapes fine interferogram whose contrast is as well as that shaped by laser of 20 mW power. Thus utilization efficiency of laser is promoted. Based on the study in theory and experiments, the paper demonstrates rationality of the portable DSPI meter.

数字散斑干涉(DSPI)是精密检测领域常用的一种测量技术,目前一般的DSPI系统使用大功率激光光源和大型光学实验平台,仅适用于实验室研究工作.为实现DSPI的工程现场应用,本文提出一种新的便携式数字散斑干涉仪的光路安排,它采用和小功率激光器相适应的光路配置,结构紧凑,体积小巧,在光源小型He-Ne激光器输出功率仅为5 mW的条件下,仍然能在实验中获得良好的干涉条纹图,其对比度可以和利用20 mW的激光得到的条纹图相比拟,有效的提高了激光的利用率.通过理论分析和实验验证,对该便携式数字散斑干涉仪的合理性进行了论证.