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一、前言在水利水电科学试验中,尤其是水工结构的脆性材料模型试验中,普遍应用电阻应变片的电测技术来测量材料和结构模型的应变,从而求出应力.电阻应变仪是决定电测精度与速度的主要设备. YJ-5型电阻应变仪具有灵敏度高、稳定性好、容易操作、可外接多台预调平衡箱实行多点测量等优点,长期以来被广泛应用于水利水电科学试验中作为静态应变的测量仪器.但YJ-5型应变仪在测量中要人工调节读数电桥,从刻度盘上读出应变值,因此花费人力多,速度慢,测量结果不能自动记录.
I. Introduction In water conservancy and hydropower scientific experiments, especially hydraulic structure of the brittle material model tests, the general application of electrical resistance gauges to measure the strain of the material and structural model to calculate the stress resistance strain gauge is to determine YJ-5-type resistance strain gauge with high sensitivity, good stability, easy to operate, can be an external multi-point pre-balance tank to implement multi-point measurement, etc., has long been widely used in water conservancy and hydropower However, the YJ-5 strain gauge requires manual adjustment of the reading bridge in the measurement and reading of the strain value from the dial, so it takes a lot of manpower and slow speed, and the measurement result can not be automatically recorded.