lukijasensorit

Lukijasensorit, also known as light-dependent resistors or photoresistors, are passive electronic components that exhibit a change in resistance in response to varying light intensity. They are commonly used in applications where light detection is required, such as in light-sensitive switches, automatic lighting controls, and camera exposure systems.

The basic principle behind lukijasensorit is the photovoltaic effect, where the absorption of photons by the semiconductor material increases the conductivity of the device. This change in resistance can be measured and used to determine the level of light present.

Lukijasensorit are typically made from materials such as cadmium sulfide (CdS) or cadmium selenide (CdSe), which are sensitive to visible and near-infrared light. These materials are chosen for their high sensitivity to light and their ability to operate over a wide range of light intensities.

The resistance of a lukijasensorit decreases as the light intensity increases, making it a useful component in circuits where the output signal needs to be inversely proportional to the light level. This characteristic is exploited in various applications, including automatic street lighting systems, where the resistance of the sensor controls the activation of lights based on ambient light conditions.

In summary, lukijasensorit are versatile and widely used sensors that convert light intensity into a measurable electrical signal. Their simplicity, reliability, and cost-effectiveness make them a popular choice in numerous light-sensitive applications.