前向散射式云滴粒子探测器散射光探测效率高、结构简单，是目前50 μm以内云滴粒子探测的重要仪器之一。建立了基于前向散射原理的云滴粒子探测器，利用固定于多维调整平台的微米量级的小孔光阑模拟周期性出现于探测区域的小粒子，并沿光轴方向前后平移小孔光阑的位置，获得系统的景深。使用5，10和30 μm 3种固定尺寸的标准粒子对系统进行了标定，获得了系统对不同尺寸标准粒子的响应曲线，利用米氏散射原理计算分析了系统对标准粒子与云滴粒子响应的对应关系，利用该关系得到系统对云滴粒子的响应曲线，该响应曲线可以用于云滴粒子粒径谱的测量。

Probe of cloud droplet (CDP) based on forward scattering is one of the most important instruments for small cloud particles, smaller than 50 μm in diameter, measurement because of its high efficiency and simple structure. A CDP based on forward scattering is constructed. To measure the depth of field, a pinhole adhered to a rotating disk which is fixed to multi-dimensional optical table is used to simulated as a particle appeared in the detection area periodically, as it moved along the laser beam, the depth of the field can be measured. Standard particles with size of 5, 10 and 30 μm are used to calibrate the system and the response curve to standard particles is obtained. Mie theory is used to study the corresponding relation between the system′s responses to standard particles and cloud droplet. The response curve to cloud droplets is obtained to measure the sizes of cloud droplets.