公开(公告)号：US11002873B2

公开(公告)日：2021-05-11

申请号：US16233130

申请日：2018-12-27

Applicant: Tsinghua University

Inventor： Xiao-Ping Zheng ,  Li Yang ,  Hua Geng

IPC: G01R23/06 ,  G01V3/10 ,  G01V3/38

Abstract: A fluxgate detector for buried and abandoned chemical weapons is provided, comprising: a probe for sensing an external magnetic field, comprising a probe input and a probe output; an excitation module electrically connected to the probe input for inputting an excitation signal into the probe; a frequency selection module electrically connected to the probe output for isolating a second harmonic signal in an induced voltage generated by the probe; and a signal acquisition module electrically connected to the frequency selection module. The second harmonic signal in the induced voltage can be isolated by the frequency selection module, transmitted to the signal acquisition module, and converted to an intensity of the magnetic field by the signal acquisition module. The substance detected can be identified according to the intensity of the magnetic field, so that the buried ACWs can be found efficiently and accurately.