【摘要】 为了提高无导轨大尺寸测量系统的精度,以具有较强稳定度和抗干扰能力的双纵模热稳频He-Ne激光器为光源,采用数字滤波提高信噪比,利用小波变换具有空间局部化的特性和表征信号奇异性的能力,在适当尺度下刻画大尺寸测量信号的过零点,进行小波锐化,以提高节点对准精度。研究结果表明:室外时拍频频率稳定度可达10-7;系统节点对准误差小于30μm;小波锐化能把双纵模无导轨大尺寸拍频干涉仪的测量精度从60μm提高到30μm。更多还原

【Abstract】 The frequency-stabilized He-Ne laser with thermoregulation was used as the light source,which operates on the double longitudinal modes,has high frequency stability and good anti-disturbance performance. Numeral filter was used to raise signal-to-noise. Using the wavelet transform with the characteristic of spatial localization and signal singularity detection ability,the local zero point of single from the large size measurement system were accurately detected on appropriate scale and edged. The precision of ranger of laser no-guide larger size was raised. Experiment results show that the beat-frequency stability can reach 10-7 in open air,error of node orientation is lower than 30 μm and wavelet transform can increase non-guide beat-wave ranger’s precision from 60 μm to 30 μm.更多还原