USE OF SCHLIEREN OPTICS WITH LOW GAS PRESSURES
JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB
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A series of experiments has been conducted using schlieren apparatus at low gas pressures. The experience here gained will be applied in the design of optical equipment for a projected Mach 5 wind tunnel. Lenses and mirrors of various focal lengths and aperture ratios were used for collimating the beam and for collecting the deviated light. Among other experiments, a trial was made with mirrors in which an axial secondary mirror was used similar to the diagonal in the Newtonian telescope. The test phenomena were shock waves produced in a partially evacuated gas chamber either by passage of a condenser discharge across a gap or by air flow from a special nozzle. The beam of the schlieren system crossed this chamber to display the refractive effects upon the screen of a camera.
- Test Facilities, Equipment and Methods