[PDF] Aero Optical Effects eBook

Author : Stanislav Gordeyev
Publisher : John Wiley & Sons
Page : 293 pages
File Size : 46,28 MB
Release : 2023-03-01
Category : Science
ISBN : 1119037174

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AERO-OPTICAL EFFECTS Explore the newest techniques and technologies used to mitigate the effects of air flow over airborne laser platforms Aero-Optical Effects: Physics, Analysis and Mitigation delivers a detailed and insightful introduction to aero-optics and fully describes the current understanding of the physical causes of aero-optical effects from turbulent flows at different speeds. In addition to presenting a thorough discussion of instrumentation, data reduction, and data analysis, the authors examine various approaches to aero-optical effect mitigation using both flow control and adaptive optics approaches. The book explores the sources, characteristics, measurement approaches, and mitigation means to reduce aero-optics wavefront error. It also examines the precise measurements of aero-optical effects and the instrumentation of aero-optics. Flow control for aero-optical applications is discussed, as are approaches like passive flow control, active and hybrid flow control, and closed-loop flow control. Readers will benefit from discussions of the applications of aero-optics in relation to fields like directed energy and high-speed communications. Readers will also enjoy a wide variety of useful features and topics, including: Comprehensive discussions of both aero-effects, which include the effects that air flow has over a beam director mounted on an aircraft, and aero-optics, which include atmospheric effects that degrade the ability of an airborne laser to focus a beam A treatment of air buffeting and its effects on beam stabilization and jitter An analysis of mitigating impediments to the use of high-quality laser beams from aircraft as weapons or communications systems Adaptive optics compensation for aero-optical disturbances Perfect for researchers, engineers, and scientists involved with laser weapon and beam control systems, Aero-Optical Effects: Physics, Analysis and Mitigation will also earn a place in the libraries of principal investigators in defense contract work and independent research and development.

Author : Stanislav Gordeyev
Publisher : John Wiley & Sons
Page : 293 pages
File Size : 46,79 MB
Release : 2023-01-04
Category : Science
ISBN : 1119037212

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AERO-OPTICAL EFFECTS Explore the newest techniques and technologies used to mitigate the effects of air flow over airborne laser platforms Aero-Optical Effects: Physics, Analysis and Mitigation delivers a detailed and insightful introduction to aero-optics and fully describes the current understanding of the physical causes of aero-optical effects from turbulent flows at different speeds. In addition to presenting a thorough discussion of instrumentation, data reduction, and data analysis, the authors examine various approaches to aero-optical effect mitigation using both flow control and adaptive optics approaches. The book explores the sources, characteristics, measurement approaches, and mitigation means to reduce aero-optics wavefront error. It also examines the precise measurements of aero-optical effects and the instrumentation of aero-optics. Flow control for aero-optical applications is discussed, as are approaches like passive flow control, active and hybrid flow control, and closed-loop flow control. Readers will benefit from discussions of the applications of aero-optics in relation to fields like directed energy and high-speed communications. Readers will also enjoy a wide variety of useful features and topics, including: Comprehensive discussions of both aero-effects, which include the effects that air flow has over a beam director mounted on an aircraft, and aero-optics, which include atmospheric effects that degrade the ability of an airborne laser to focus a beam A treatment of air buffeting and its effects on beam stabilization and jitter An analysis of mitigating impediments to the use of high-quality laser beams from aircraft as weapons or communications systems Adaptive optics compensation for aero-optical disturbances Perfect for researchers, engineers, and scientists involved with laser weapon and beam control systems, Aero-Optical Effects: Physics, Analysis and Mitigation will also earn a place in the libraries of principal investigators in defense contract work and independent research and development.

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Page : 0 pages
File Size : 32,42 MB
Release : 1998
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Aerooptical phenomena associated with the propagation of optical beams and imaging through turbulent index-of-refraction fields have been investigated. Using simultaneous imaging of optical-beam distortion and the turbulent index-or-refraction field, we have documented near-field behavior, following propagation through moderate-to-high Reynolds number jets and shear layers. For both flows, propagation through turbulence may result in the formation of caustics. Preliminary measurements using the Palomar 200" telescope confirm the formation of caustics in atmospheric propagation, using bright stars as sources. Spatial wavefront and wavefront-tilt measurements of beams emerging from jet and shear layer regions exhibit non-Kolmogorov behavior. Preliminary efforts to reconstruct images through turbulence indicate the need for both amplitude and wavefront-tilt measurements for reliable image reconstruction.

Author : Xinguo Zhang
Publisher : Springer
Page : 3068 pages
File Size : 22,79 MB
Release : 2019-06-08
Category : Technology & Engineering
ISBN : 981133305X

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This book is a compilation of peer-reviewed papers from the 2018 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2018). The symposium is a common endeavour between the four national aerospace societies in China, Australia, Korea and Japan, namely, the Chinese Society of Aeronautics and Astronautics (CSAA), Royal Aeronautical Society Australian Division (RAeS Australian Division), the Korean Society for Aeronautical and Space Sciences (KSAS) and the Japan Society for Aeronautical and Space Sciences (JSASS). APISAT is an annual event initiated in 2009 to provide an opportunity for researchers and engineers from Asia-Pacific countries to discuss current and future advanced topics in aeronautical and space engineering.

Author :
Publisher :
Page : 82 pages
File Size : 39,33 MB
Release : 1991
Category :
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The U.S. Army Strategic Defense Command (USASDC) has several ongoing and planned programs that utilize optical sensors aboard missiles traveling at hypersonic velocities in the atmosphere. Central to the missile homing problem are aero-optical effects upon a missile-born sensor/seeker which looks through both an electromagnetic window and the flow field about the vehicle. Aspects of the problem include modeling and simulation of the flow field on incident radiation from a target, and finally, predicting the resultant image imperfections and error in apparent object position as perceived by the sensor.

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Page : 0 pages
File Size : 13,68 MB
Release : 1999
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Hypersonic endo-atmospheric interceptors must maneuver over a variety of flight environments. Generally, these interceptor missions require flight below Mach 8 for some portion of the mission. Hypervelocity intercepts can occur at high altitudes but are more stressing at the lower altitude, high Reynolds number conditions. To obtain the high accuracy needed for hit-to-kill, endo-atmospheric interceptors use optically based seeker systems. These optical seekers rely on precise knowledge of the interceptor position to select an aimpoint. Optical aberrations caused by hypersonic flight can distort or shift the image position on the focal plane enough to add uncertainty in the position and cause the interceptor to miss. These image distortions are typically referred to as aero-optical effects. To lower risk to the program, the thermal and structural response and the optical aberrations on the seeker window should be assessed through ground testing. This type of ground testing is dependent on duplicating flight parameters. In addition, thermal/structural testing requires long run times consistent with end-game scenarios. Evaluation of interceptor performance in a ground test facility that can provide full flight duplication for seconds of run time will greatly reduce risk to these programs. An aero-optics test capability has been demonstrated in Hypervelocity Wind Tunnel 9 (Tunnel 9) at the Arnold Engineering Development Center (AEDC). In this facility, flight aerodynamic conditions can be matched for run times of 6 seconds, thereby duplicating the aerothermal/structural response of the window. This facility creates an ideal environment to characterize and evaluate seeker system aero-optical effects. This paper outlines the significant verification and validation processes developed for feasibility demonstration. It provides an overview of the important aspects and results of the program to date.