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Proceedings Paper

High-dynamic range DMD-based IR scene projector
Author(s): Julia Rentz Dupuis; David J. Mansur; Robert Vaillancourt; Ryan Benedict-Gill; Scott P. Newbry
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Paper Abstract

OPTRA is developing a next-generation digital micromirror device (DMD) based two-band infrared scene projector (IRSP) with infinite bit-depth independent of frame rate and an order of magnitude improvement in contrast over the state of the art. Traditionally DMD-based IRSPs have offered larger format and superior uniformity and pixel operability relative to resistive and diode arrays, however, they have been limited in contrast and also by the inherent bitdepth / frame rate tradeoff imposed by pulse width modulation (PWM). OPTRA’s high dynamic range IRSP (HIDRA SP) has broken this dependency with a dynamic structured illumination solution. The HIDRA SP uses a source conditioning DMD to impose the structured illumination on two projector DMDs – one for each spectral band. The source conditioning DMD is operated in binary mode, and the relay optics which form the structured illumination act as a low pass spatial filter. The structured illumination is therefore spatially grayscaled and more importantly is analog with no PWM. In addition, the structured illumination concentrates energy where bright object will be projected and extinguishes energy in dark regions; the result is a significant improvement in contrast. The projector DMDs are operated with 8-bit PWM, however the total projected image is analog with no bit-depth / frame rate dependency. In this paper we describe our progress towards the development, build, and test of a prototype HIDRA SP.

Paper Details

Date Published: 8 March 2013
PDF: 9 pages
Proc. SPIE 8618, Emerging Digital Micromirror Device Based Systems and Applications V, 86180R (8 March 2013); doi: 10.1117/12.2001871
Show Author Affiliations
Julia Rentz Dupuis, OPTRA, Inc. (United States)
David J. Mansur, OPTRA, Inc. (United States)
Robert Vaillancourt, OPTRA, Inc. (United States)
Ryan Benedict-Gill, OPTRA, Inc. (United States)
Scott P. Newbry, OPTRA, Inc. (United States)

Published in SPIE Proceedings Vol. 8618:
Emerging Digital Micromirror Device Based Systems and Applications V
Michael R. Douglass; Patrick I. Oden, Editor(s)

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