| 摘要 |
A device for monitoring eye attention along an axis includes a telescope directed toward the eye, and a four quadrant photocell detector disposed at the image plane of the telescope. The four photocell outputs are summed to produce X, Y, and common mode signals. These signals are processed to form their absolute values, and are then summed to produce a voltage proportional to deviation of the direction of the eye from the desired axis. This voltage signal is compared with a background illumination signal by an adjustable threshold detector, which actuates a Schmitt trigger to indicate deviation of the attention of the eye.
|
