350-00009

In the field of optical sensors photo detectors, CdS cells, also known as cadmium sulfide photo resistors, play an essential role. These devices are widely used in electronic circuits for light detection, voltage control, and exposure control. CdS cells are particularly valuable in the field of optoelectronics, due to their low cost and high reliability. In this article, we’ll discuss the application and working principles of 350-00009 CdS cells.

Applications

CdS cells are primarily used as light detectors in electronic and optical circuits. For example, they can be used to detect infrared and visible light, and to measure the light intensity. They are also used as exposure control devices, to control the intensity of a light source. CdS cells are also used in alarm systems, to detect human presence or to measure air quality.

Apart from being used in optoelectronics circuits, CdS cells are also used as current regulators, voltage regulators, and temperature sensors. They can be used as temperature sensors in solar heaters, and as current and voltage regulators in AC/DC power supplies. CdS cells are also used in photometers, to measure light intensity. They can be used in night vision devices, to detect low-level light.

Working Principles

CdS cells contain a cadmium sulfide semiconductor, which is the key component that enables light detection. This semiconductor changes its electrical resistance when exposed to light. This change is referred to as the photoconductive effect. Therefore, when light is incident on the cell, the cell’s resistance will decrease. Alternatively, when the light is removed, the cell’s resistance will increase.

The change in resistance is very linear and is dependent on the wavelength of the light incident on the cell. The sensitivity of the cell to different wavelengths varies, with infrared light being more readily detected than visible light. The response time of the cell is also relatively quick, typically a few microseconds.

Most CdS cells have a built in reverse-biased diode, which eliminates the need for a separate diode in the circuit. When this diode is forward biased, the cell’s resistance decreases and when it is reverse biased, the cell’s resistance increases. The diode also helps to protect the cell from high voltage transients.

Conclusion

CdS cells are widely used in optical sensor and optoelectronics circuits. They are low cost and reliable devices that can detect both infrared and visible light. The response time of the cell is quick and the sensitivity to different wavelengths of light can be adjusted. CdS cells are particularly valuable in the field of optoelectronics, due to their low cost and high reliability.