A Novel Weak Signal Detection Method of Electromagnetic LWD Based on a Duffing Oscillator

Figure 10

Diagram of the Duffing oscillator at a 2 MHz signal excitation phase state.

(a) No noise power ()

(b) No noise power ()

(c) Noise power = 12.5 nW ()

(d) Noise power = 125 nW ()

(e) Power noise = 989 nW ()

(f) Power noise = 990 nW ()