
6 Opto
Linear optical imager
This section describes an economical optical line imager with 64 point
resolution. Applications abound: with some arrangement for vertical
scanning, it would even make a rudimentary TV camera, with twice the
resolution of Baird's pre-second world war TV system!
Sensing
the
position
A common requirement in industry, especially with the advance of
automation, is position sensing, allied to position control actuators of
various kinds. For the simpler jobs, discrete photodetectors, vane switches
and the like suffice, but for critical applications, a progressive rather than
an on/off indication of position is required ...