Subminiature Hot-Wire Sensor Construction
NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL ENGINEERING
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The detailed procedure for constructing subminiature hot-wire sensors is given. The wire used is 0.625 um diameter, 90 per cent platinum10 per cent rhodium, plated with 30-40 um diameter of silver. For construction, the plated wire is first bent into the appropriate shape, and then soldered onto stainless steel prongs. Portions of the silver are then etched, removing it entirely from a 200-400 mm length of platinumrhodium wire. Small portions of copper plating are then added to give the desired platinumrhodium wire sensing length, and to insure that good mechanical and electrical connections exist to the sensor. With this procedure, subminiature hot wire sensors have been constructed which operate with minimal drift, and are mechanically robust for long periods of time. The sensors have been demonstrated to be a useful research tool for turbulence research because they provide a more accurate means to measure energy levels of small-scale turbulent motions than is possible with other measurement devices.
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- Test Facilities, Equipment and Methods