Photocell array sensor for projectile position detection
In accordance with the present invention a projectile sensor comprises a support means, a lens means and a photocell comprised of multiple parallel photosensitive elements interposed by one or more diagonal photosensitive elements on or of a substrate disposed so as to provide changes in their electrical response when objects passing linearly through the sensor's field of view form an image through a lens upon the photosensitive elements in sequence. In its simplest embodiment, the photosensitive elements of the sensor substantially form a forward or reversed English letter &#8220;N&#8221; shape, such that a projectile's image passing over the photosensitive elements produces a series of electrical responses, where the ratios of the times between such changes relate to the velocity and position of the object.
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Lawrence Raymond Thomas Edward
Davis Brown