High-precision LVDT measuring circuit and measuring method

The invention discloses a high-precision LVDT measuring circuit and measuring method. The circuit comprises a displacement sensor LVDT, a single-chip microcomputer circuit, a reference circuit, an amplifier circuit, a voltage filter circuit, and a filter circuit. When the circuit is used, a sine wave excitation signal of the novel high-precision LVDT measuring circuit and method employs a 12-bit DA, the AD collects 14-bit, the reference precision is 0.5 per thousand, and the temperature drift is 10 ppm. The temperature drift of the whole hardware circuit is small, the precision is high, the DA and the AD of the whole circuit are integrated in the single-chip microcomputer, the main cost is the single-chip microcomputer and a peripheral operational amplifier, the whole cost is within 20 yuan, the main cost is basically equal to that of a traditional discrete device scheme and is far lower than that of an integrated circuit (IC) scheme, digital measurement is carried out through a software algorithm, different