Video & Camera Equipment

difference between IR Camera and CCD Camera in CCTV System?

Hi !
Can anyone help me in finding out the explanation between IR Camera & CCD Camera. I need to prepare a project report on this, please

IR = infrared, refers to the frequency spectrum of light (color). There are two commonly used IR bands for imaging. Near-IR is just outside the region of colors we can see. People use near IR to take interesting pictures and can be used to view an unlit area, as perceived by humans, that is illuminated by a near-IR light (humans can't see the near-IR light source). This has been used in wildlife photography and surveillance. Thermal-IR is a spectral band where heat is emitted. Thermal-IR is far away from our visual capability. This requires a special imaging sensor and lens. Thermal IR cameras image the heat radiated off surfaces. These cameras generally start off at $10,000 for cheap systems.

CCD = charge coupled device, a type of image sensor used in cameras. CCD sensors can sense light in the near UV down to near IR. CCD sensors can't be used to image thermal-IR. Filters are usually placed in front of the sensor to block UV and IR so just the visible spectrum is sensed.

There is lots of information about light spectra and CCD image sensors on the Web.

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