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Optica Publishing Group
  • Journal of the Optical Society of Korea
  • Vol. 15,
  • Issue 2,
  • pp. 174-181
  • (2011)

Imaging Performance Analysis of an EO/IR Dual Band Airborne Camera

Open Access Open Access

Abstract

An airborne sensor is developed for remote sensing on an aerial vehicle (UV). The sensor is an optical payload for an eletro-optical/infrared (EO/IR) dual band camera that combines visible and IR imaging capabilities in a compact and lightweight package. It adopts a Ritchey-Chrétien telescope for the common front end optics with several relay optics that divide and deliver EO and IR bands to a charge-coupleddevice (CCD) and an IR detector, respectively. The EO/IR camera for dual bands is mounted on a two-axis gimbal that provides stabilized imaging and precision pointing in both the along and cross-track directions. We first investigate the mechanical deformations, displacements and stress of the EO/IR camera through finite element analysis (FEA) for five cases: three gravitational effects and two thermal conditions. For investigating gravitational effects, one gravitational acceleration (1 g) is given along each of the +x, +y and +z directions. The two thermal conditions are the overall temperature change to 30℃ from 20℃ and the temperature gradient across the primary mirror pupil from -5℃ to +5℃. Optical performance, represented by the modulation transfer function (MTF), is then predicted by integrating the FEA results into optics design/analysis software. This analysis shows the IR channel can sustain imaging performance as good as designed, i.e., MTF 38% at 13 line-pairs-per-mm (lpm), with refocus capability. Similarly, the EO channel can keep the designed performance (MTF 73% at 27.3 lpm) except in the case of the overall temperature change, in which the EO channel experiences slight performance degradation (MTF 16% drop) for 20℃ overall temperate change.

© 2011 Optical Society of Korea

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