Diffractographic dynamometer.
A recent paper has described a new diffractographic sensor utilizing a changing single slit diffraction pattern to determine torque in rotating or stationary shafts (T. R. Pryor, O. L. Hageniers, and W. P. T. North, Soc. Exp. Stress Anal., in press). In that experiment, diffraction pattern fringe spacing was visually measured and found linearly related to torque. Described here isa simple and useful modification to the above device that produces a pulse burst whose frequency is linearly proportional to horsepower. Such a n output is quasi-digital and preserves the high resolution and other advantages previously obtained. Another version, producing a pulse burst whose count is linearly proportional to torque, is also discussed. The principal disadvantage of the disclosed electronic horsepower readout is a small dead zone of near zero values that cannot be measured.
Pryor
T R
TR
Hageniers
O L
OL
North
W P
WP