Introduction to Characteristics of Camera Tubes - Light Transfer Characteristics
It is not anything but, the output current of the camera tube is relies on the light falls on the glass face plate.
SPECTRAL RESPONSE
The camera tube could capable to sense the light variation which our eyes could capable to sense.
SENSITIVITY
Sensitivity is the capacity of converting video signal of extremely small image. The camera tube should contain this to a needed level.
DARK CURRENT
The output signal received while no light falls on the glass face plate is termed as Dark current.
LAG CHARACTERISTICS
While the camera tube could not capable to sense the high speed light variation, it is termed as Lag characteristics.
RESOLVING POWER
The power of sensing the White and Black portions of the picture and providing the output consequently is termed as Resolving power.
IMAGE ORTHICON CAMERA TUBE
Image orthicon camera tube makes use of or the high photo emissive sensitivity available from photo cathodes, images multiplication at the target that caused through secondary emission and an electron multiplier. A sectional view of an image orthicon is displayed in the diagram. It contain three major sections: They are
i) Image Section
ii) Scanning Section
iii) Multiplier Section
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within of the glass face plate at the front is coated by a silver-antimony coating sensitized with caesium, to serve like photocathode.
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