Sato T, Sasaki O
Appl Opt. 1978 Dec 15;17(24):3890-4. doi: 10.1364/AO.17.003890.
A new 3-D laser Doppler velocimeter, which is not sensitive to any random Gaussian noise, is proposed. The information required of the velocity vector under observation is extracted from signals detected simultaneously by three appropriately arranged detectors through their cross-bispectral analysis. This system can detect fairly faint information even when much extraneous noise is present, since the cross-bispectral analysis of simultaneously detected signals works for the effective derivation of the required information and is completely free from any random Gaussian noise. This method is especially suitable for accurate measurement of velocity vectors in a specified plane. The principle, theoretical discussion, construction of the system, and some experimental results are reported.
提出了一种对任何随机高斯噪声都不敏感的新型三维激光多普勒测速仪。通过对三个适当布置的探测器同时检测到的信号进行互双谱分析，提取观测速度矢量所需的信息。即使存在大量外部噪声，该系统也能检测到相当微弱的信息，因为同时检测到的信号的互双谱分析有助于有效地推导所需信息，并且完全不受任何随机高斯噪声的影响。该方法特别适用于在指定平面内精确测量速度矢量。报道了该方法的原理、理论探讨、系统构造及一些实验结果。
