Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Reexamination Certificate
2008-07-24
2010-10-19
LeDynh, Bot L (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
C324S067000, C324S228000
Reexamination Certificate
active
07816920
ABSTRACT:
An exemplary metal detector includes a detecting circuit, a SCM, a converting circuit, and a cymometer. The SCM cooperates with the detecting circuit to generate a current signal with a specific frequency, the converting circuit transforms the current signal received from the SCM to a voltage signal, and the cymometer displays a value of a frequency of the current signal according to the voltage signal. When the detecting circuit detects a metal nearby, the value of the frequency of the current signal displayed on the cymometer changes.
REFERENCES:
patent: 2008/0237003 (2008-10-01), Smith et al.
Li et al, Signal Detection Method for Magnetic Resonance, Derwent 2005-571866, Nov. 15, 2004.
Gong Lian-Zhong
Liu Tian-You
Qin Qiang
Hon Hai Precision Industry Co. Ltd.
Hong Fu Jin Precision Industry (Shen Zhen) Co., Ltd.
LeDynh Bot L
Ma Zhigang
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