Author: Dallas T. Hayes
Publisher:
ISBN:
Category : Ablation (Aerothermodynamics)
Languages : en
Pages : 84
Book Description
To develop alternative solutions to Air Force problems relating to signal transmission in the presence of ionization, AFCRL undertook an extensive investigation of techniques for modifying reentry plasmas. The program included laboratory tests and a series of reentry flight experiments. This report describes the flight test of one successful technique, Teflon ablation, a passive approach that requires no internal support systems. A reentry vehicle fitted with a Teflon-coated nosecap was instrumented to measure antenna impedance mismatch, interantenna coupling, signal attenuation, and charged-particle density. The probe data showed that the local boundary-layer electron density decreased by as much as a factor of 200. The Teflon coating effected a 25-dB decrease in S-band signal attenuation. High-power antenna breakdown was modified by the presence of the ablation products. Details of the vehicle design, flight dynamics, and ablation, are presented, and the results of the Teflon-ablation technique are contrasted with those of a successful liquid-injection technique that was tested on a previous flight.
An Ablation Technique for Enhancing Reentry Antenna Performance; Flight Test Results
An Ablation Technique for Enhancing Reentry Antenna Performance; Flight Test Results
Author: Dallas T. Hayes
Publisher:
ISBN:
Category : Ablation (Aerothermodynamics)
Languages : en
Pages : 0
Book Description
To develop alternative solutions to Air Force problems relating to signal transmission in the presence of ionization, AFCRL undertook an extensive investigation of techniques for modifying reentry plasmas. The program included laboratory tests and a series of reentry flight experiments. This report describes the flight test of one successful technique, Teflon ablation, a passive approach that requires no internal support systems. A reentry vehicle fitted with a Teflon-coated nosecap was instrumented to measure antenna impedance mismatch, interantenna coupling, signal attenuation, and charged-particle density. The probe data showed that the local boundary-layer electron density decreased by as much as a factor of 200. The Teflon coating effected a 25-dB decrease in S-band signal attenuation. High-power antenna breakdown was modified by the presence of the ablation products. Details of the vehicle design, flight dynamics, and ablation, are presented, and the results of the Teflon-ablation technique are contrasted with those of a successful liquid-injection technique that was tested on a previous flight. (Author).
Publisher:
ISBN:
Category : Ablation (Aerothermodynamics)
Languages : en
Pages : 0
Book Description
To develop alternative solutions to Air Force problems relating to signal transmission in the presence of ionization, AFCRL undertook an extensive investigation of techniques for modifying reentry plasmas. The program included laboratory tests and a series of reentry flight experiments. This report describes the flight test of one successful technique, Teflon ablation, a passive approach that requires no internal support systems. A reentry vehicle fitted with a Teflon-coated nosecap was instrumented to measure antenna impedance mismatch, interantenna coupling, signal attenuation, and charged-particle density. The probe data showed that the local boundary-layer electron density decreased by as much as a factor of 200. The Teflon coating effected a 25-dB decrease in S-band signal attenuation. High-power antenna breakdown was modified by the presence of the ablation products. Details of the vehicle design, flight dynamics, and ablation, are presented, and the results of the Teflon-ablation technique are contrasted with those of a successful liquid-injection technique that was tested on a previous flight. (Author).
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
Book Description
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
Book Description
R & D Abstracts
Author: Technology Reports Centre (Great Britain)
Publisher:
ISBN:
Category :
Languages : en
Pages : 584
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 584
Book Description
Government Reports Annual Index
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 882
Book Description
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 882
Book Description
Catalogs of the Scripps Institution of Oceanography Library
Author: Scripps Institution of Oceanography. Library
Publisher:
ISBN:
Category : Marine biology
Languages : en
Pages : 980
Book Description
Publisher:
ISBN:
Category : Marine biology
Languages : en
Pages : 980
Book Description
Government Reports Announcements & Index
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1344
Book Description
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1344
Book Description
Government Reports Announcements
Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 182
Book Description
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 182
Book Description
Government reports annual index
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 880
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 880
Book Description
Government Reports Index
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 908
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 908
Book Description