Pedrini G, Fröning P, Tiziani H J, Gusev M E
Institut für Technische Optik, UniversitätStuttgart, Pfaffenwaldring 9, D-70569 Stuttgart, Germany.
Appl Opt. 1999 Jun 1;38(16):3460-7. doi: 10.1364/ao.38.003460.
A two-wavelength method for a fast shape measurement by use of a pulsed ruby laser is presented. The wavelength change is produced by alteration of the distance between the plates of the laser's output etalon. One plate of the etalon is mounted on a vibrating piezoelectric element; this allows a fast wavelength change. Two holograms at different wavelengths are recorded in a few microseconds by use of a CCD. The holograms are reconstructed digitally, and the wave-front phase is calculated. The shape is obtained by subtraction of the phases of the wave fronts recorded at different wavelengths. Environmental disturbances at low frequencies, such as air turbulence, vibrations, and object drift, have no influence on the measurement. Experimental results are presented.
提出了一种利用脉冲红宝石激光器进行快速形状测量的双波长方法。波长变化是通过改变激光输出标准具的板间距离产生的。标准具的一块板安装在一个振动的压电元件上；这允许快速改变波长。利用电荷耦合器件（CCD）在几微秒内记录两个不同波长的全息图。全息图进行数字重建，并计算波前相位。通过减去在不同波长记录的波前相位来获得形状。低频环境干扰，如空气湍流、振动和物体漂移，对测量没有影响。给出了实验结果。
