Optoelectronic sensors
There are so many devices that are sensitive to light, and so many applications for them, that we are devoting a separate chapter to the optoelectronic sensors.
Light-dependent resistor
This consists of a disc or square block of semiconducting material, usually cadmium sulphide, with two electrodes printed on its surface (photograph above). The electrodes are shaped so that there is a narrow gap between them, but their edges are waved to make the length of the gap as great as possible. The whole is encapsulated in clear plastic. When a p.d. is applied to the electrodes, a current passes from one electrode to the other.
Under ...
Get Understand Electronics, 2nd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
