A three-dimensional orthogonal laser velocimeter for the NASA Ames 7- by 10-foot wind tunnel

Dunagan, Stephen E.; Cooper, Donald L.

A three-component dual-beam laser-velocimeter system has been designed, fabricated, and implemented in the 7-by 10-Foot Wind Tunnel at NASA Ames Research Center. The instrument utilizes optical access from both sides and the top of the test section, and is configured for uncoupled orthogonal measurements of the three Cartesian coordinates of velocity. Bragg cell optics are used to provide fringe velocity bias. Modular system design provides great flexibility in the location of sending and receiving optics to adapt to specific experimental requirements. Near-focus Schmidt-Cassegrain optic modules may be positioned for collection of forward or backward scattered light over a large solid angle, and may be clustered to further increase collection solid angle. Multimode fiber optics transmit collected light to the photomultiplier tubes for processing. Counters are used to process the photomultiplier signals and transfer the processed data digitally via buffered interface controller to the host MS-DOS computer. Considerable data reduction and graphical display programming permit on-line control of data acquisition and evaluation of the incoming data. This paper describes this system in detail and presents sample data illustrating the system's capability.

Document ID

19950014906

Acquisition Source

Legacy CDMS

Document Type

Technical Memorandum (TM)

Authors

Date Acquired

September 6, 2013

Publication Date

February 1, 1995

Subject Category

Report/Patent Number

Accession Number

95N21323

Funding Number(s)

Distribution Limits

Public

Work of the US Gov. Public Use Permitted.

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