铁电材料相变温度的测量一般采用电桥法,即测量铁电材料介电系数随温度的变化,由介电系数的转折温度来确定相变温度。但电桥法测量常常碰到一些困难:第一,有些铁电材料相变温度较高,在高温时电导较大;有些铁电材料在接近相变温度时损耗已超出电桥测量范围,使电桥无法平衡,不能确定其相变温度。第二,大部分手控电桥不备有线性电压输出, The measurement of phase transition temperature of ferroelectric materials generally adopts the bridge method, that is, measuring the dielectric constant of ferroelectric material with temperature, and determining the phase transition temperature from the transition temperature of dielectric coefficient. But the bridge method often encountered some difficulties: First, some ferroelectric materials, high phase transition temperature, high conductance at high temperature; some ferroelectric materials near the phase transition temperature loss has exceeded the bridge measurement range, so that Bridge can not be balanced, can not determine the phase transition temperature. Second, most of the manual control bridge is not equipped with a linear voltage output,