华东电子仪器厂生产了一种 PBD 型半导体应变片。这种应变片利用了半导体材料的压阻效应,在承受应变时,电阻值会产生很大的变化。与一般的金属丝式或箔式应变片相比,其灵敏度要高出60～80倍以上,从而排除了处理微小信号的困难。此外,由于它的机械滞后极小,因而可以测量静态应变、低频应变、以至 East China Electronic Instrument Factory produced a PBD semiconductor strain gauge. This strain gage takes advantage of the piezoresistive effect of semiconductor materials, which undergo a large change in resistance when subjected to strain. Compared with the general wire or foil strain gauge, its sensitivity is higher than 60 to 80 times, thus eliminating the difficulty of handling small signals. In addition, because of its minimal mechanical hysteresis, it is possible to measure static strain, low-frequency strain,