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A fiber optic lever sensing technique that can be used to measure normal pressure as well as shear stresses is discussed. This method uses three unequal fibers combining small size and good sensitivity.Static measurements appear to confirm the theoretical models predicted by geometrical optics and dynamic tests performed at frequencies up to 10 kHz indicate a flat response within this frequency range. These sensors are intended for use in a low speed wind tunnel environment.

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The measurement of mean velocities, forces, pressures, and shear stresses can provide useful information about transition, separation, and turbulent friction in the study of fluid flow. In most cases, previous sensors have lacked some of the features necessary to satisfactorily establish the flow properties. This paper discusses the development of an optical fiber pressure sensor whose active dimensions, sensitivity, and frequency response have shown to improve the measuring capabilities presently available. The device is designed for flush mounting in a suitable aluminum plate installed in the test section of a wind tunnel. Details of the construction will be discussed and data, related to the dc and ac calibration methods used, will be presented. [Work supported by NASA and NUSC.]