【摘要】 在高精度测量中必须实时补偿空气折射率的影响。文中提出了等效合成波的概念,利用长度不等的两个真空管构成两个虚拟波长并推导出等效合成波测量公式,并由此建立了一种新型的双真空管空气折射率测量仪。该仪器具有结构紧凑、能实现实时测量的优点。系统测量分辨率为1×10-8,与Edlen公式方法进行的比对实验结果表明,其测量精度优于1×10-7,并具有很好的稳定性和抗干扰能力。更多还原

【Abstract】 The error resulted from air refractive index should be corrected in-situ for the high accuracy measurement. A concept named as an equivalent synthetic wave is presented, based on which a novel air refractometer is developed. It has two virtual waves by adopting two vacuum chambers with different lengths. This air refractometer takes the advantages of compact structure and the ability of real-time correction of air refractive index in high accuracy measurement. The resolution of the refractometer is 1×10^-8, and the experiment results comparing with the method of Edlen equation showing that the apparatus has good stability with an accuracy better than 1×10^-7.更多还原