To study the structure of telecentric beam path for zoom lens system, the axial displacement equation for the stop was deduced, which keep the system telecentric in all zoom position.
进一步研究变焦距系统远心光路的结构特征，得出了使系统在整个变焦过程中都处于远心位置的光阑轴向位移方程。
This paper uses an object telecentric beam path in a diameter measurement system, designs a data acquisition circuit , and presents a accuracy measure method with polynomial interpolation.
设计了数据采集电路 ，把物方远心光路应用在测径系统中 ，提出了一种利用多项式插值精确测量物体尺寸的方法。
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