Accession Number:

ADP000236

Title:

A Laser-Interferometric Trajectory-Following System for Determining Forces on Freely Flying Models in a Shock-Tunnel,

Descriptive Note:

Corporate Author:

QUEEN MARY COLL LONDON (ENGLAND) DEPT OF AERONAUTICAL ENGINEERING

Personal Author(s):

Report Date:

1981-07-01

Pagination or Media Count:

9.0

Abstract:

A prototype, two-point trajectory-following system is described, which uses a pair of simple Michelson interferometers having the same He-Ne laser as a light source. Each interferometer provides a measurement arm which is used to follow the motion of a reference point on the model, a fringe-cycle being generated when the reference point moves a half-wavelength along the beam incident on the model. Each set of frequency-modulated pulse trains is detected by a photodiode and recorded by a transient recorder. The stored information is then played back to a two-pen recorder from which the displacements versus time and hence the accelerations of the reference points can be determined.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE