Høgmoen K, Løkberg O J
Appl Opt. 1977 Jul 1;16(7):1869-75. doi: 10.1364/AO.16.001869.
We describe a new method for real-time detection and measurement of small vibrations, based on phase modulation in time-average electronic speckle pattern interferometry. The modulation frequency is shifted relative to the vibration frequency, which makes the intensity of the reconstructed image vary at the difference frequency. The amplitude detection limits are about 20 A by visual observation and 0.1 A by photoelectric measurement using a lockin technique. No auxiliary system for fringe stabilization is required. At higher amplitude levels we can study the deformation of the object in slow motion. Measurements on different objects, including human ear preparation, are presented.
我们描述了一种基于时间平均电子散斑图案干涉术中的相位调制来实时检测和测量微小振动的新方法。调制频率相对于振动频率发生偏移，这使得重建图像的强度以差频变化。通过目视观察，振幅检测极限约为20 Å，使用锁定技术进行光电测量时为0.1 Å。无需用于条纹稳定的辅助系统。在较高振幅水平下，我们可以研究物体的慢动作变形。文中展示了对包括人耳标本在内的不同物体的测量结果。
