基于F-P腔形式的圆柱形声学共鸣腔自动化特征长度测量模型研究

Research on Automatic Characteristic Length Measurement Model of Cylindrical Acoustic Resonator Based on F-P Cavity

开尔文作为热力学基本单位,其基准值由固定实物作为标准,故常会受到物理性质的影响,因此,决定开发新的定义方式以摆脱物理性质的依赖。玻尔兹曼常数作为新的定义元素其腔长应为绝对值,所以研究将选用F-P腔形式的圆柱形声学共鸣腔作为常数来源,并由此建立一套自动化测量腔长的模型,该模型基于小数重合法对腔体的等倾干涉形成环的直径进行测量,从而计算出腔体的特征长度,该自动化系统可以自动操控激光器、测量模块及计算模块等实现成本控制。研究进行9组重复实验,结果表明该系统能将重复实验的结果波动控制40254167 nm附近,且范围极小。以环境变量为研究对象的实验结果表明,同温度下的测量结果相差不大,腔体随温度增加而增加,最后为了提高精度,研究将不确定度来源及产生情况进行测量,结果将作为系统改进依据,从而提高精度。

Kelvin is the basic unit of thermodynamics,and its reference value is based on the fixed object,so it is often affected by physical properties.Therefore,it is decided to develop a new definition to get rid of the dependence on physical properties.Boltzmann constant,as a new definition element,its cavity length should be an absolute value,so the research will select the cylindrical acoustic resonance cavity in the form of F-P cavity as the constant source,and therefore establish a set of automatic measurement model of cavity length.This model measures the diameter of the equal inclination interference ring of the cavity based on the decimal weight method,so as to calculate the characteristic length of the cavity.The automatic system can automatically control the laser The measurement module and calculation module realize cost control.Nine groups of repeated experiments were carried out.The results show that the system can control the fluctuation of repeated experiments around 40254167 nm,and the range is very small.The experimental results of taking environmental variables as the research object show that the measurement results at the same temperature have little difference,and the cavity increases with the increase of temperature.Finally,in order to improve the accuracy,the source and generation of uncertainty are measured,and the results will be used as the basis for system improvement,so as to improve the accuracy.