Laser Velocimeter Optical Traverse Scheme: An Investigation of a Proposed Optical Scanning Technique for Arnold Engineering and Development Center's Four-Foot Transonic Wind Tunnel
Laser Velocimeter Optical Traverse Scheme: An Investigation of a Proposed Optical Scanning Technique for Arnold Engineering and Development Center's Four-Foot Transonic Wind Tunnel

Author: G. S. Krajci

Publisher:

Published: 1983

Total Pages: 141

ISBN-13:

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This investigation analyzed a nonstandard laser velocimeter setup proposed for use in AEDC Wind Tunnel 4T. The setup uses a gimballed mirror to move the probe volume from point to point, and the translation of a lens to control the distance in the tunnel the probe volume reaches. Results show that for equal indices of refraction inside and outside the tunnel, the laser beams of a converging pair do not totally converge with its associated beam except under certain conditions, and the probe volumes created by each pair of overlapping laser beams do not always coincide. This work then provides the conditions necessary for total convergence of a pair of laser beams for this setup. A solution is then proposed to insure convergence of each laser beam pair and overlap of the two probe volumes. More than a solution to the above problems, a method is given to determine the azimuth and elevation angles for a mirror such that the reflected beam off the mirror passes through a given point in the tunnel after traversing a window. To carry out these investigations, a computer code was written to simulate the nonstandard laser velocimeter setup, and a second code was written to determine the azimuth and elevation angles for a mirror such that the reflected beam off the mirror passes through a given point in the tunnel after traversing a window. Both codes were written in FORTRAN 77, implemented on a CDC 6000-CYBER 74.

Masters Theses in the Pure and Applied Sciences
Masters Theses in the Pure and Applied Sciences

Author: Wade H. Shafer

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 407

ISBN-13: 1468451979

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 29 (thesis year 1984) a total of 12,637 theses titles from 23 Canadian and 202 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 29 reports theses submitted in 1984, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Government Reports Annual Index
Government Reports Annual Index

Author:

Publisher:

Published: 1984

Total Pages: 1316

ISBN-13:

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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.

Performance Test of Laser Velocimeter System for the Langley 16-foot Transonic Tunnel
Performance Test of Laser Velocimeter System for the Langley 16-foot Transonic Tunnel

Author: James F. Meyers

Publisher:

Published: 1985

Total Pages: 44

ISBN-13:

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And investigation has been conducted in which a laser velocimeter was used to measure free-stream velocities form Mach 0.1 to 1.0 and the flow velocities along the stagnating streamline of a hemisphere-cyclinder model at Mach 0.8 and 1.0. The flow velocity was also measured at Mach 1.0 along the line 0.533 model diameters below the model. These tests determined the performance characteristics of the dedicated two-component laser velocimeter at flow velocities up to Mach 1.0 and the effects of the wind tunnel environment on the particle-generating system and on the resulting size of the generated particles. To determine these characteristics, the measured particle velocities along the stagnating streamline at the two Mach numbers were compared with the theoretically predicted gas and particle velocities calculated using a transonic potential flow method. Through this comparison the mean detectable particle size (2.1 micrometers) along with the standard deviation of the detectable particle (0.76 micrometers) was determined; thus the performance characteritics of the laser velocimeter were established. Keywords: Laser velocity; Transonic flows; Particle sizing.

Design and Evaluation of a Laser Doppler Velocimeter for the AEDC-PWT 4-Foot Transonic Tunnel
Design and Evaluation of a Laser Doppler Velocimeter for the AEDC-PWT 4-Foot Transonic Tunnel

Author: F. L. Crosswy

Publisher:

Published: 1978

Total Pages: 62

ISBN-13:

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The design details and initial performance evaluation of a two-component Laser Doppler Velocimeter (LDV) system for a large transonic wind tunnel are presented. The two-color, backscatter LDV was specially developed for free-stream, pitch plane flow angle and velocity magnitude measurements using only intrinsic particulate matter as light scatterers. An environmental control system and remote optical alignment techniques were developed since the LDV was located in the hostile environment (vibration, vacuum, inaccessibility, etc.) of the tunnel plenum region. A new-type LDV signal processor was developed to process the low-level signals produced by the small intrinsic particles. A versatile, computer-based system was developed for high-speed data acquisition. LDV mean velocity and flow angle data are compared to free-stream velocity data and aerodynamic flow angle probe data. (Author).