首页>
外国专利>
Interferometry method based on changing frequency
Interferometry method based on changing frequency
展开▼
机译：基于频率变化的干涉测量方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
An interferometry method using a laser of nominally fixed—but unknown and changing—frequency and phase angle, for example, attributable to laser drift. The interference pattern is periodically sampled at a frequency considerably higher than the phase shift of the object. The wavelength is reconstructed from the sampled patterns using a correlation algorithm. The phase angle is determined using an n-bucket algorithm. After all of the complex information has been determined at all of the multiple wavelengths, the surface of the object is calculated using conventional interferometry techniques. Accordingly, laser drift—typically considered a negative attribute—is used positively.
展开▼
