What is the main disadvantage of photoconductive cell?

What is the main disadvantage of photoconductive cell?

The major drawback of the photoconductive cells is that temperature variations cause substantial variations in resistance for a substantial variations in resistance for a particular light intensity. Therefore such a cell is unsuitable for analog applications.

What are the uses of photoconductive cell?

Photoconductive cells are generally inexpensive, and their small size and ease of use makes them popular in many applications. Some of the many uses include: making street lights turn on and off automatically according to the level of daylight. in point-of-sale and inventory bar code reading devices.

What are the advantages and disadvantages of LDR?

LDR disadvantages Hysteresis effect. Low temperature stability for the fastest materials. The variation of the value of the resistance has a certain delay, different if it goes from dark to illuminated or from illuminated to dark. This limits the use of LDRs in applications where the light signal varies rapidly.

Which type of sensor a photoconductive cell is?

The Photoconductive Cell. A Photoconductive light sensor does not produce electricity but simply changes its physical properties when subjected to light energy. The most common type of photoconductive device is the Photoresistor which changes its electrical resistance in response to changes in the light intensity.

What are advantages and disadvantages of Photoresistor?

➨It is replacement of variable resistance and also has dependency on the light. It’s resistance decreases when light falls on it and increases in the dark. ➨Photo resistors are cheap and available in various shapes and sizes. ➨They require very small power and voltage for its operation.

What is the photoconductive effect?

An internal photoelectric effect in which some nonmetallic materials exhibit a marked increase in electrical conductivity upon absorption of photon energy. The incident photons excite electrons into the conduction band where they move more freely, resulting in increased electrical conductivity.

What is a photoconductive cell?

Definition of photoconductive cell : a photoelectric cell utilizing photoconductivity (as in a layer of selenium) so that an increase in illumination causes a decrease in electrical resistance and permits the flow of a greater electrical current.

What are the advantages of light sensors?

Following are the advantages of Light sensor : ➨It is easy to integrate with lighting system such as automatic lighting system. ➨It is used for energy consumption or energy management by automatic control of brightness level in mobile phones and auto ON/OFF of street lights based on ambient light intensity.

What is the principle of photoconductive cell?

It is based on the principle that the resistance of certain semiconductors materials decreases when they are exposed to radiations. In others words such material have high dark resistance and low irradiated resistance.

What is the purpose of a photoresistor?

A photocell or photoresistor is a sensor that changes its resistance when light shines on it. The resistance generated varies depending on the light striking at his surface. A high intensity of light incident on the surface will cause a lower resistance, whereas a lower intensity of light will cause higher resistance.

Why is photoconductivity important?

Photoconductivity serves as a tool to understand the internal processes in these materials, and it is also widely used to detect the presence of light and measure its intensity in light-sensitive devices.