Joint influences of aerodynamic flow field and aerodynamic heating of the dome on imaging quality degradation of airborne optical systems

Haosu Xiao; Baojun Zuo; Yi Tian; Wang Zhang; Chenglong Hao; Chaofeng Liu; Qi Li; Fan Li; Li Zhang; Zhigang Fan

doi:10.1364/AO.51.008625

Applied Optics
Vol. 51,
Issue 36,
pp. 8625-8636
(2012)
•https://doi.org/10.1364/AO.51.008625

Joint influences of aerodynamic flow field and aerodynamic heating of the dome on imaging quality degradation of airborne optical systems

Haosu Xiao, Baojun Zuo, Yi Tian, Wang Zhang, Chenglong Hao, Chaofeng Liu, Qi Li, Fan Li, Li Zhang, and Zhigang Fan

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Haosu Xiao, Baojun Zuo, Yi Tian, Wang Zhang, Chenglong Hao, Chaofeng Liu, Qi Li, Fan Li, Li Zhang, and Zhigang Fan, "Joint influences of aerodynamic flow field and aerodynamic heating of the dome on imaging quality degradation of airborne optical systems," Appl. Opt. 51, 8625-8636 (2012)

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Abstract

We investigated the joint influences exerted by the nonuniform aerodynamic flow field surrounding the optical dome and the aerodynamic heating of the dome on imaging quality degradation of an airborne optical system. The Spalart–Allmaras model provided by FLUENT was used for flow computations. The fourth-order Runge–Kutta algorithm based ray tracing program was used to simulate optical transmission through the aerodynamic flow field and the dome. Four kinds of imaging quality evaluation parameters were presented: wave aberration of the exit pupil, point spread function, encircled energy, and modulation transfer function. The results show that the aero-optical disturbance of the aerodynamic flow field and the aerodynamic heating of the dome significantly affect the imaging quality of an airborne optical system.

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Altitude (km)	10
Mach number (Mach)	3
Inlet total pressure (Pa)	26,435.8
Inlet total temperature (K)	223.15
Angle of attack (°)	0

Physical Properties	Performance Parameters
Density ( $kg \cdot m^{- 3}$ )	3980
Melting point (K)	2323
Expansion coefficient ( $10^{- 6} K^{- 1}$ )	5.3
Heat capacity ( $J \cdot {kg}^{- 1} \cdot K^{- 1}$ )	750
Young’s modulus ( $10^{9} Pa$ )	344
Thermal conductivity ( $W \cdot m^{- 1} \cdot K^{- 1}$ )	36
Poisson ratio	0.27
Mean strength ( $10^{6} Pa$ )	300

Point	$Δ n_{o}$	$Δ n_{e}$	$Δ n_{1}$	$Δ n_{2}$	$Δ n_{3}$	$Δ n_{4}$	$Δ n_{5}$	$Δ n_{6}$
1	$1.80 \times 10^{- 3}$	$2.02 \times 10^{- 3}$	$5.46 \times 10^{- 6}$	$6.87 \times 10^{- 6}$	$7.65 \times 10^{- 6}$	$- 2.32 \times 10^{- 7}$	$8.75 \times 10^{- 9}$	$2.93 \times 10^{- 9}$
2	$1.64 \times 10^{- 3}$	$1.84 \times 10^{- 3}$	$5.29 \times 10^{- 7}$	$1.28 \times 10^{- 6}$	$1.59 \times 10^{- 6}$	$- 1.25 \times 10^{- 7}$	$6.52 \times 10^{- 9}$	$2.19 \times 10^{- 9}$

Altitude (km)	10
Mach number (Mach)	3
Inlet total pressure (Pa)	26,435.8
Inlet total temperature (K)	223.15
Angle of attack (°)	0

Physical Properties	Performance Parameters
Density ( $kg \cdot m^{- 3}$ )	3980
Melting point (K)	2323
Expansion coefficient ( $10^{- 6} K^{- 1}$ )	5.3
Heat capacity ( $J \cdot {kg}^{- 1} \cdot K^{- 1}$ )	750
Young’s modulus ( $10^{9} Pa$ )	344
Thermal conductivity ( $W \cdot m^{- 1} \cdot K^{- 1}$ )	36
Poisson ratio	0.27
Mean strength ( $10^{6} Pa$ )	300

Abstract

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Figures (17)

Tables (3)

Equations (16)

Applied Optics