Optical Sensors: Science, Technology and Applications - Hardcoverby Owen Moran (Editor) Optical sensors are a broad class of devices that are designed to detect and convert incident light rays into electrical signals. The most common types of optical sensors include transmission type photo interrupters, reflective photosensors, photoconductive devices, photodiodes, and phototransistors. Transmission type photo interrupters detect the presence of objects by intercepting light. These are used in position sensing and