What is pyroelectric vidicon camera?
Pyroelectric vidicons (PEV) are low-cost infrared TV camera tubes which operate at room temperature and image in any wavelength band within the 2-400-micron range. For the 8-14-micron band, the PEV has a typical minimum resolvable temperature (MRT) of less than 1 C at 250 TVL.
What is vidicon camera?
The vidicon is a storage-type camera tube in which a charge-density pattern is formed by the imaged scene radiation on a photoconductive surface which is then scanned by a beam of low-velocity electrons. The fluctuating voltage coupled out to a video amplifier can be used to reproduce the scene being imaged.
Which photoconductive material is used in vidicon?
This electrode consists of a photoconductive layer of selenium or antimony trisulphide towards the side of the electron gun. This conductive coating is also known as the target electrode.
What is used in solid state cameras?
solid-state imaging camera (SSI) In remote sensing, an instrument that operates in the visible spectrum and uses a chargecoupled device to enhance its images.
How did the image dissector work?
An image dissector, also called a dissector tube, is a video camera tube in which photocathode emissions create an “electron image” which is then scanned to produce an electrical signal representing the visual image.
Why do CCD and CID cameras are used?
Explanation: CCD or CID cameras are used to generate the electronic signal that represents the image. The camera collects light from the image scene via lens and uses a photosensitive target to converts it into electronic signal.
What is a solid state imager?
An imaging system that uses a mosaic of tiny light-sensitive semiconductors (phototransistors) to produce individual outputs that are then converted into a coherent video signal.
What are the different types of camera tubes?
Vidicon and Plumbicon are the two major types of photoconductive camera tubes. Basically, in the photoconductive type of target plate, the image that falls on its surface is changed into a charge distribution. Further, an electron beam scans it and changes it into an electrical signal.