精密离心机动态半径测试方法研究与实现

Research and Implement on Precision Centrifuge Dynamic Radius Test

摘要:

为了对精密离心机动态半径进行有效的测量,提出了一种基于外基准的定点定位测量方法,并利用电容测微仪、24位高精度PXI数据采集卡搭建了动态半径测试系统；在测试过程中,首先对离心机动态半径数据进行等角度采样,然后精确提取精密离心机定位平台所在的转盘外边缘的局部数据,再将不同转速下的局部数据进行点对点的比较,计算出动态半径；对测量结果的不确定度进行了评定,评定结果表明,文中提出的测试方法能够实现对精密离心机动态半径较高精度的测量,测量精度可达0.085 μm。

Abstract:

In order to measure the dynamic radius of precision centrifuge effectively, this paper proposes a fixed point and position measurement method based on the benchmark, and use the capacitance micrometer, 24 bits high-precision PXI data collection card set up a dynamic radius test system; In the process of test, uniform angular sampling the dynamic radius data of the centrifuge first, and accreting extraction the local date of precision centrifuge platform edge, then the dynamic radius can be calculated by comparing the local date between different speed point to point. The uncertainty evaluation of the measurement results show that the proposed test method can achieve high accuracy of precision centrifuge dynamic radius measurement, and the accuracy of precision can reach to 0.085 μm.