Which college is better USICT or LNMIIT

How do electronic devices detect light?

Computer scanners, digital cameras that can see, store and process data are the end product of a technological development that began with a single photocell called a photodiode or photovoltaic cell. The cell is one of millions etched into the surface of a silicon chip.

The cell is made by joining two pieces of silicon crystal, one being a photodiode and the other being a charge coupled device.

Electric charges that are built up from one diode to another when light strikes the photodiode.

Charges travel from the device with coupled charge through an amplifier, which converts the charges into electrical current using different voltages. This is an analog representation of the various intensities of light collected by diodes.

Then the current is passed through the A / D converter. A microchip translates undulating voltages into a series of numbers. Another microchip uses numbers for pictures.

Light detection chips built on the charge coupling device and the CMOS switch on a variety of computer peripherals, from digital cameras to scanners, copiers, fax machines and biometric identification devices that visually identify people based on their fingerprints, iris and facial features can.

There is no such thing as an electronic device that can capture light.

Initiate line in case of photodiode light

The resistances vary with LDR light

In solar cells, light generates electricity