Sensor detection circuit

The utility model discloses a sensor detection circuit comprising a first oscillator, a first isolation circuit, a second oscillator, a second isolation circuit, a mixer circuit, a third isolation circuit, a low-pass filter, a first LC oscillation circuit, a second LC oscillation circuit, a timing resistor, and a timing capacitor. The first oscillator and the second oscillator are identical in structure. The first LC oscillation circuit, the first oscillator and the first isolation circuit are connected in sequence. The second LC oscillation circuit, the second oscillator and the second isolation circuit are connected in sequence. The output end of the first isolation circuit and the output end of the second isolation circuit are connected to the mixer circuit and then connected to the low-pass filter. The timing resistor and the timing capacitor are connected to the low-pass filter. The output end of the low-pass filter is used as the output of the whole circuit. The sensor detection circuit is highly stable, is not easily influenced by outside interference, and is simple in structure and practical. The problem of frequency stability of a variable-frequency detection circuit is solved.