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Christopher J Crowley¹, Iosif I Shinder¹, Michael R Moldover¹

¹National Institute of Standards and Technology, Gaithersburg, MD 20899, United States of America.

Metrologia

|April 23, 2025

概括

我们使用光学刀片作为可追溯速度标准对激光多普勒气流计 (LDA) 进行了校准. 这种方法实现了高精度,确保可靠的流体速度测量.

科学领域:

流体动力学和计量学
光学测量技术的使用.

背景情况:

激光多普勒气流计 (LDA) 是用于测量流体速度的光学仪器.
直接追溯LDA测量到国际单位系统 (SI) 是一个挑战,因为复杂的,专有子系统.
现有的LDA校准方法往往是间接的或缺乏SI可追溯性.

研究的目的:

开发和验证一种用于SI可追溯的完整激光多普勒气流计系统的校准方法.
为 LDA 校准建立可靠的速度标准.
评估不同系统配置的LDA测量的准确性和一致性.

主要方法:

使用完整的激光多普勒气流计系统校准方法.
采用光学刀片作为准确的SI可追溯速度标准.
使用NIST的风洞对两个具有不同规格 (制造商,焦距,传感体积,方向) 的LDA进行了校准比较.

主要成果:

在95%的置信级别下,实现了0.094%的扩展速度不确定性.
校准的LDA显示出极好的一致性,在0.530 m s-1的空速范围内,差异最多为0.2%.
证明了光学刀片方法在校准各种LDA系统的有效性.

结论:

光学刀片方法为完整的LDA系统的SI可追溯校准提供了实用和准确的手段.
这种校准方法确保了从LDAs获得的流体速度测量的高可靠性.
这些发现支持使用这种方法来确保流体流量测量的计量可追溯性.

关键词:

测量空气速度的测量空气速度标准的标准.激光多普勒气流量计是什么?激光多普勒速度计的速度计.

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