Each month, NTB highlights tech briefs related to a particular area of technology in a special section called Technology Focus. Here are some of the technologies featured in the February issue focus on Test and Measurement.

-Optical Measurement of Mass Flow of a Two-Phase Fluid

The Marshall Space Flight Center has developed an optoelectronic system that utilizes wavelength- dependent scattering of light to measure the density and mass of a two-phase liquid in a pipe. The apparatus was originally developed to measure mass flow of a two-phase cryongenic fluid, but the operating principle can be adapted to non-cryogenic two-phase fluids. (Page 18)

-Piezoelectric Bolt Breakers and Bolt Fatigue Testers

NASA's Jet Propulsion Laboratory has developed a family of devices for inducing fatigue in bolts in order to break the bolts would incorporate piezoelectric actuators in resonant fixtures as in ultrasonic/sonic

drills/corers and similar devices previously described in NASA Tech Briefs. These device were originally intended to be used as safe, reliable alternatives to explosive bolts used to fasten spacecraft structures, that must subsequently be separated from each other quickly on command during flight. (Page 20)

Read previously published tech briefs on Test and Measurement and other technologies here .