CROSSTALK MODEL OF A DEFORMABLE-MIRROR-BASED INFRARED SCENE PROJECTOR

An analytical model for crosstalk is developed for an infrared scene p rojector that utilizes a deformable-mirror device as an infrared spati al light modulator. Partial-coherence effects that result from the phy sical layout of the projection system are included. Crosstalk is deter mined by defining a crosstalk ratio in the projected image. Crosstalk- ratio calculations are carried out for monochromatic and blackbody pro jection sources over the 3- to 5-mum wavelength band. The results pred ict crosstalk ratios of 260:1, 1200:1, and 2400:1 for deformable-mirro r pixels of 50, 100, and 150 mum when a blackbody source is used in th e projection system. Crosstalk performance is improved at shorter wave lengths and for larger deformable-mirror pixels. The results of a proo f-of-principle experiment are included to verify the feasibility of a deformable-mirror device in the projection system.