Dual head measuring techniques for radiation gaging of reinforcing bar

摘要

A continuously measuring on-line production gage calibrated to indicate bar weight per foot and unaffected by typical reinforcing bar shape variability utilizes two radiation gages with their measuring axes separated by 90 degrees and offset by 45 degrees from the rib plane of the reinforcing bar. Each gage is equipped with a shutter which may be adjusted electrically to simulate any required weight per foot standard and with the gage zeroing on a predetermined shutter setting, the shutter automatically opens and radiation detector signal variations from the zero point are amplified, linearized, averaged, and scaled electronically to produce a percent weight per foot output signal. Summation of detected radiation is also performed through use of optical fibers.