Tunable electro-optic filter stack
First Claim
1. A switchable optical shielding system comprising a visor integrated with a holographic polymer dispersed liquid crystal tunable filter, the holographic polymer dispersed liquid crystal tunable filter capable of switching between respective transparent and reflective states in no more than 20 microseconds.
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Abstract
A holographic polymer dispersed liquid crystal (HPDLC) tunable filter exhibits switching times of no more than 20 microseconds. The HPDLC tunable filter can be utilized in a variety of applications. An HPDLC tunable filter stack can be utilized in a hyperspectral imaging system capable of spectrally multiplexing hyperspectral imaging data acquired while the hyperspectral imaging system is airborne. HPDLC tunable filter stacks can be utilized in high speed switchable optical shielding systems, for example as a coating for a visor or an aircraft canopy. These HPDLC tunable filter stacks can be fabricated using a spin coating apparatus and associated fabrication methods.
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Citations
18 Claims
- 1. A switchable optical shielding system comprising a visor integrated with a holographic polymer dispersed liquid crystal tunable filter, the holographic polymer dispersed liquid crystal tunable filter capable of switching between respective transparent and reflective states in no more than 20 microseconds.
- 9. A switchable optical shielding system comprising a canopy mounted to an aircraft, at least a portion of the canopy integrated with a holographic polymer dispersed liquid crystal tunable filter, the holographic polymer dispersed liquid crystal tunable filter capable of switching between respective transparent and reflective states in no more than 20 microseconds.
Specification