Optical effects of shock front on nose-mounted optics

Area of Science:

• Aerospace Engineering
• Optical Physics
• Fluid Dynamics

Background:

• Shock waves generated during supersonic flight create density discontinuities.
• These discontinuities can interfere with optical systems, impacting performance.
• Nose-mounted optical systems are particularly susceptible to these effects.

Purpose of the Study:

• To evaluate the impact of shock wave density discontinuities on optical system performance.
• To quantify performance degradation for f/2 optics under Mach 1.5 conditions.
• To provide data for designing optical systems for supersonic vehicles.

Main Methods:

• Simulated shock wave optical conditions as an optical element.
• Utilized a computer ray trace program for optical analysis.
• Calculated the modulation transfer function (MTF) with and without the shock wave present.

Main Results:

• The presence of the shock wave significantly reduced the modulation transfer function (MTF).
• Performance degradation was quantified for f/2 optics at Mach 1.5.
• Ray trace analysis confirmed the detrimental optical effects of the shock discontinuity.

Conclusions:

• Density discontinuities in supersonic shock waves degrade optical system performance.
• The study quantifies performance loss, essential for optical system design in supersonic applications.
• Further research may explore mitigation strategies for shock wave-induced optical distortions.