What is the working principle of the camera?

In the closed-circuit monitoring system, the camera is also called a camera or CCD (charge coupled device), which is a charge coupled device. Strictly speaking, a camera is a general term for cameras and lenses.

The main sensitive element of the camera is CCD, which has the characteristics of high sensitivity, small distortion, long life, anti-vibration, anti-magnetic field, small size and no afterimage. CCD is a kind of electric coupling device, which is called charge coupling device for short. It can convert light into charge, store and transfer the charge, and take out the stored charge to change the voltage, so it is an ideal camera element.

The working principle of CCD is that the light reflected by the object is transmitted to the lens, and then gathered on the CCD chip through the lens. CCD accumulates corresponding charges according to the intensity of light, and generates electrical signals representing pictures after periodic discharge. After filtering and amplification, the standard composite video signal is output through the output end of the camera. This standard video signal is the same as the video output of home video recorder, VCD player and home video camera, so it can also be recorded or connected to TV set for viewing.