System for determining position of normal shock in supersonic fl

Details System for determining position of normal shock in supersonic fl System for determining position of normal shock in supersonic fl

1990-08-07

1991-12-17

Woodiel, Donald O.

Measuring and testing

Simulating operating condition

Marine

73147, 356129, G01M 1900

Patent

active

050726129

ABSTRACT:
Light from a plurality of light emitting diodes is transmitted through optical cables (12) to a lens system. The lenses (56, 58) expand and collimate the light and project it in a sheet (16) across the supersonic inlet of an aircraft power plant perpendicular to incoming airflow. A normal shock bends a portion of the sheet of light (16). A linear array of a multiplicity of optical fiber ends collects discrete samples of light. The samples are processed and compared to a predetermined profile to determine the shock location.

REFERENCES:
patent: 2971330 (1961-02-01), Clark
patent: 3623361 (1969-11-01), Funk, Jr.
patent: 3642017 (1972-02-01), Homes
patent: 3693015 (1972-09-01), Funk, Jr.
patent: 3714827 (1973-02-01), Batts
Bandef et al., "An Improved Laser-Schlierem System for Measurement of Shock-Wave Velocity", Rev. Sci. Instrum., vol. 7, Jul. 1974.

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