Filter system countering laser dazzle

摘要

Laser dazzle countering apparatus comprises two optical channels 11, 12 containing respective rejection filters A,B. Filters A and B are complementary, one transmitting where the other does not. Filter A may pass radiation within a first sequence of spaced passbands whereas filter B passes radiation within a second sequence of spaced passbands, the first and second sequences of passbands alternating in wavelength ascendency order. It is preferred that the filters A,B have a common rejection band at or about 500 nm. The channels 11, 12 may also incorporate fast light switches S1, S2 respectively blocking passage of dazzle radiation through the channel if such radiation is incident on the switch.