Measuring and testing – Ductility or brittleness
Patent
1975-06-09
1976-10-26
Gill, James J.
Measuring and testing
Ductility or brittleness
346 79, G01B 716
Patent
active
039876675
ABSTRACT:
The deflection of a subterranean tunnel is measured with a rod-like, self-contained instrument that is adapted to be inserted into a radially extending bore of the tunnel adjacent an end of the tunnel where the tunnel is being dug. One end of the instrument is anchored at the end of the bore remote from the tunnel wall, while the other end of the instrument is anchored adjacent the end of the wall in proximity to the tunnel wall. The two ends of the instrument are linearly displaceable relative to each other; the displacement is measured by a transducer means mounted on the instrument. Included in the instrument is a data storage means including a paper tape recorder periodically responsive to a parallel binary signal indicative of the measured displacement. In response to an operator command, a visual indicator including a pair of different colored light emitting diodes, at a face of the rod adjacent the tunnel wall, is responsive to a serial binary signal indicative of the measured displacement. The operator commands the unit by momentarily shining a light on a photodetector at the face of the tube adjacent the tunnel wall. The relative position of the two ends of the instrument is adjustable so that both of the light emitting diodes are substantially simultaneously activated while the instrument is in a calibrate mode; the device is activated into the calibration mode by illuminating the photodetector for a longer time interval than that utilized to provide a visual reading of the transducer measurement.
REFERENCES:
patent: 1708333 (1929-04-01), Smith
patent: 3416230 (1968-12-01), Oleson et al.
patent: 3427632 (1969-02-01), Vahs et al.
patent: 3826128 (1974-07-01), McVey et al.
Hof, Jr. Peter John
Rasmussen Donald Edgar
Ciarlante Anthony V.
Fraser Donald R.
Gill James J.
Sadowsky Gersten
The United States of America as represented by the Secretary of
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