前向散射粒径探测器测量不确定度的校准

为了对粒径探测器的测量不确定度进行校准,基于衍射原理方法,研制了一套小孔圆盘校准装置。该方法对米氏散射与夫琅禾费衍射的功率进行计算和模拟,得到了衍射针孔孔径与气溶胶粒径转换的关系。通过该转换关系,计算得到校准装置的参量,并进行了理论分析和实验验证。通过实验将标准粒子的测量不确定度传递给云粒子粒径探测器,再通过旋转针孔圆盘进行实验,将测量不确定度传递给校准装置。取得了该校准装置的校准实验数据,验证了理论分析的正确性。结果表明,该校准装置效率高、校准方案的可行性好、校准范围大、测量离散性好、重复性高。这一结果对粒径探测器的校准技术研究是有帮助的。

Calibration of measurement uncertainty of forward-scattering spectrometer probes

For the purpose of calibration of a forward-scattering spectrometer probe ( FSSP ) , a pinhole-disc calibration apparatus was designed based on diffraction technology .After calculation and simulation of Mie scattering and Fraunhofer diffraction power , the conversion relationships between the pinhole diameter and aerosol particle size were gotten .Parameters of calibration apparatus were gained after calculation based on the conversion relationship . After theoretical analysis and experimental verification , measurement uncertainty of standard particles was delivered to cloud particle spectrometer probe .And then, after the experiment of rotating pinhole disc , measurement uncertainty was passed to the calibration apparatus . Experimental results of calibration apparatus verified theoretical analysis .The results show that calibration apparatus has feasible calibration scheme with high efficiency , large calibration range , good measurement discrete uniformity and good repeatability . The study is helpful for calibration technology of spectrometer probes .