Engineering topics
Publications and source records attributed to Walker, R. R..
Simple circuit conditions output of 50 ohm sensor for readout on straingage recorder. It consists of resistors, switch, and "matching" network. Device saves time and reduced instrumentation costs when strain and temperature are measured in same setup.
Computerized pressure regulator controls gas pressure in fixed volume container, increasing, maintaining, and decreasing pressure according to programmed instructions. Controller is adaptable to any volume size or shape, and pressure variation may be synchronized.
Miniature pressure transducer responds to static or dynamic pressures acting against a structural surface without introducing errors caused by stresses in the structural surface. This is accomplished by a thin stainless steel pressure sensing diaphragm with an attached foil strain gage.
Web belt system measures belt or strap load. It is partially disassembled and installed on an existing belt without cutting or re-threading the belt. A strain gage, installed on one of the support beams, eliminates errors due to uneven loading.
Spiral springs equipped with strain gages which are hard-wired to readout instrumentation, measure deflection between two relatively inaccessible surfaces in a drop test that causes them to close to near flatness. This technique has been successfully used on Apollo drop tests to measure deflection between aft bulkhead and heatshield.