PSD Sensor Decomposing Multiple Light Spots
Hiroshima R&D Center, Mitsubishi Heavy Industries, ltd., 4-6-22 Kanon-shimmachi, Nishi-ku, Hiroshima 733-8553, Japan
Position-sensitive detectors (PSDs) detect light spots point and total lights focused on it. The PSD provides high-speed response and precision due to its simple working principle. Inexpensive one-dimensional (1D) PSDs are commercially available, but when multiple lights focus on the PSD, it can only the center of multiple light positions making it unable to detect individual light positions separately. We propose a sensor that breaks down multiple light spots individua1ys by combing the rotation of a polygon mirror and two 1D PSDs. We consider how many light spots is broken down. We designed and developed a PSD sensor consisting of two 1D PSDs, a polygon mirror, and an actuator for rotating the polygon mirror. We broke down multiple light spots into individuals in scanning at 50.8Hz.
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