◦The feature of the dielectric optical coating filter is to have a steep decline of transmittance from the visible range to IR range. In addition to this; the heat absorption filter is efficient for transmitting at the visible range and cutting off the IR range. ◦It is frequently used as a IR cut filter on a CCD sensor. ◦It is also used as a filter to cut-off the heat from the illumination in a biological microscope to avoid heating up the specimen.
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