LVDT sensor detection method

The invention provides an LVDT sensor detection method, which belongs to the technical field of measurement and testing, and adopts an LVDT sensor detection device which comprises an AD conversion circuit, an MCU circuit, a DA conversion circuit, a first band-pass filter, a second band-pass filter, an LVDT sensor, a third band-pass filter and a feedback signal conditioning circuit. The method comprises the following steps: controlling a DA conversion circuit to generate a sinusoidal signal and a cosine signal as primary side basic signals; a third band-pass filter is adopted to filter signal interference of the secondary side signal; a first band-pass filter and a second band-pass filter are respectively arranged on sine and cosine signals of the LVDT sensor; the feedback signal conditioning circuit collects the filtered LVDT feedback signal and sine excitation signal, and performs differential sampling and subtraction to obtain a conditioning result; the MCU circuit controls the off-chip AD sampling time to