Optical Sensors - Photo Detectors - CdS Cells, also known as cadmium sulfide cells, are pivotal components within the realm of sensor technology. Their primary function revolves around sensing light intensity and converting it into corresponding electrical signals. They are essentially photoresistors, which means their resistance decreases as the intensity of light they are exposed to increases. Among their notable traits is their excellent sensitivity to visible and infrared light, which makes them an optimal choice for a plethora of light-sensitive applications.
Particularly, these CdS Cells can be found serving distinct roles in various applications. They are often employed in light-dependent switches for outdoor lighting control, burglar alARM circuits, and light meters in photography, leveraged for their ability to respond to shifts in ambient light. Further, they are also relevant in some types of smoke, flame, and oil detectors due to their sensitivity to particular light wavelengths. Major manufacturers of these cells include Honeywell, Panasonic, and ROHM Semiconductor. The versatility, affordability, and high sensitivity of these CdS cells underscore their importance in sensor technology and beyond.