外来生物入侵已成为当前全球性的环境问题，为此迫切需要一种能实现现场检测的植物检验仪器。研究了一种用于幼虫现场检测的便携式图像分析仪，该仪器采用变焦显微物镜系统，能实现0.7～9倍的变焦；以发光二极管（LED）为光源，采用正交实验法进行反射式均匀照明系统的优化设计，使目标面上Ф50 mm的范围内照度均匀性达到83.7%；编写出专用的幼虫图像分析软件，对被检幼虫进行分析与识别。便携式幼虫图像分析仪的研制，为植物检验检疫在线检测提供了新的手段。

With the invasion of alien organisms becoming a global environmental problem, it needs a instrument for the on-line detection. A portable image analyzer which can realize on-line larva detection for plant quarantine is demostrated. The instrument adopts zooming optical system with a 0.7～9 zoom by rotating zoom ring. The apparatus has a light emitting diode(LED) reflective uniform illumination system optimized by using orthogonal experiment method. In the scope of Φ50 mm, the uniformity of illumination can reach up to 83.7%. A larva-recognition software is designed to identify and analyze the larvae. The proposed portable larvae image analyzer provides a new on-line detection method.