| 摘要 |
1,088,219. Measuring displacement electrically. TRANSARC Inc. Aug.1, 1966 [Aug.6, 1965], No.34425/66. Heading G1N. Linear or angular displacement is measured by cementing a strain gauge to a thin steel tape which is moved over a pulley or other curved guide. In one embodiment, for measuring strain of a specimen undergoing tensile testing, movement of the specimen is transmitted by rod 51 to a steel tape 41 mounted on pulleys 33, 34. The tape carries two resistance strain gauges one of which is visible at 42, the other being on the far side of the tape so that as the rod 51 is moved downwards this strain gauge is pulled on to pulley 33 whilst gauge 42 moves off the pulley. The two strain gauges form two arms of a bridge to which a millivolt recorder or cathode ray oscilloscope is connected. In modifications, the tape may be moved by rack and pinion, Fig. 9 (not shown), may carry four strain gauges, Fig.4 (not shown); may have a spring return instead of being in a continuous loop. Figs. 12, 14 (not shown), may have a counter-weight and slide over a stationary, curved guide, Fig. 3A (not shown), or the tape may be moved by rotation of a pulley to which it is secured, Figs.10, 11 (not shown). |
