Roos P A, Stephens M, Wieman C E
Appl Opt. 1996 Dec 1;35(34):6754-61. doi: 10.1364/AO.35.006754.
We describe a sensitive and inexpensive vibrometer based on optical feedback by diffuse scattering to a single-mode diode laser. Fluctuations in the diode laser's operating frequency that are due to scattered light from a vibrating surface are used to detect the amplitude and frequency of surface vibrations. An additional physical vibration of the laser provides an absolute amplitude calibration. The fundamental bandwidth is determined by the laser response time of roughly 10(-9)s. A noise floor of 0.23 nm/Hz(1/2) at 30 kHz with 5 × 10(-5) of the incident light returning is demonstrated. This instrument provides an inexpensive and sensitive method of noncontact measurement in solid materials with low or uneven reflectivity. It can be used as a vibration or velocity sensor.
我们描述了一种基于漫散射光反馈至单模二极管激光器的灵敏且低成本的振动计。由振动表面散射光引起的二极管激光器工作频率波动用于检测表面振动的幅度和频率。激光器的额外物理振动提供绝对幅度校准。基本带宽由约10^(-9)s的激光响应时间决定。在30kHz时展示了0.23nm/Hz^(1/2)的本底噪声，入射光返回率为5×10^(-5)。该仪器为低反射率或反射率不均匀的固体材料提供了一种低成本且灵敏的非接触测量方法。它可用作振动或速度传感器。
