Shafir E, Berkovic G
Electro-Optics Division, Soreq NRC, Yavne, Israel.
Appl Opt. 2006 Oct 20;45(30):7772-7. doi: 10.1364/ao.45.007772.
We describe a fiber optic confocal sensor (FOCOS) system that uses an optical fiber and a lens to accurately detect the position of an object at, or close to, the image plane of the fiber tip. The fiber characteristics (diameter and numerical aperture) and optics (lens F/# and magnification) define the span and precision of the sensor and may be chosen to fit a desired application of position and displacement sensing. Multiple measurement points (i.e., fiber-tip images) may be achieved by use of multiple wavelengths in the fiber, so that each wavelength images the fiber at a different plane due to the chromatic dispersion of the optics. Further multiplexing may be achieved by adding fibers on the optical axis. A FOCOS with multiplexed fibers and wavelengths may also be used for velocity measurements.
我们描述了一种光纤共焦传感器（FOCOS）系统，该系统使用光纤和透镜来精确检测位于光纤尖端图像平面处或其附近的物体的位置。光纤特性（直径和数值孔径）以及光学器件（透镜F/#和放大倍数）决定了传感器的量程和精度，并且可以根据位置和位移传感的预期应用进行选择。通过在光纤中使用多个波长，可以实现多个测量点（即光纤尖端图像），这样由于光学器件的色散，每个波长会在不同平面上对光纤进行成像。通过在光轴上添加光纤可以实现进一步的复用。具有复用光纤和波长的FOCOS也可用于速度测量。
