Engineering topics
Publications and source records attributed to Greenwood, T. L..
Antenna loop direction finder, consisting of two separate loops mounted rigidly together at right angles to each other, requires single rotation for operation. The loops, one for bearing, the other for sensing, are rotated manually. Sensing loop, in conjunction with nondirectional antenna, produces signal with directional pattern.
Paractor design for accurate dc amplification and digital data transmission
Instrumentation research reviews at Marshall Space Flight Center
Electric network for monitoring temperatures, detecting critical temperatures, and indicating critical time duration
Direct current parametric amplifier for very low voltages - description and circuit applications
Determining sway of buildings by low frequency device using pendulum
Pendular seismic transducer mounted on base plate measures small horizontal displacements of structures subjected to vibration where no fixed reference point is available. Enclosure of transducer in transparent plastic case prevents air currents from disturbing the pendulum balance.
A series circuit was developed to check the continuity in thermocouple sensors. This method may be used in monitoring continuity in any dc voltage-operated control circuit.
A piezoelectric transducer provides accurate calibration of vibration amplitudes to 20 g. The calibration system uses an electromagnetically driven resonant beam to generate mechanical vibrations at a fixed frequency.