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WiFS camera consists of two bands and are named as B3 and B4, because
these bands are similar to Band 3 and Band 4 of IRS-1A/1B/P2. The total swath is
covered using two optical heads ie., two lenses and two CCDs are used per band. They
are mounted at an angular separation of 26 deg generated by a single Electro Optic
Module (EOM). WiFS camera uses refractive collecting optics consisting of eight
refractive lens elements with interference filter and neutral density (ND) filter
in the front. A 2048 element linear array CCD with a pixel size of 13 micron by 13
micron is used. It has separate readouts for even and odd pixels on two channels.
The data for each device will be readout four times during the
line scan time period. Only one out of every four readouts is transmitted.
Four independently selectable gains are provided for each band/CCD.
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