Title:
CIRCUIT AND METHOD FOR DETECTING MEDIUM BELOW GYPSUM BOARD
Document Type and Number:
WIPO Patent Application WO/2018/001032
Kind Code:
A1
Abstract:
A circuit and method for detecting a medium below a gypsum board. The method comprises: first, providing a sensor which is composed of a group of PCB copper foils, namely two PCB copper foils which are in completely identical shapes form left and right electrode plates. Second, providing a detection driving signal ClK, which is applied to the left and right electrode plates, such that an electromagnetic field is formed between the left and right electrode plates and the ground. Next, providing a waveform shaping as well as a phase difference circuit, such that each individual electrode plate may generate a phase difference relative to a driving signal thereof. And then, providing a phase inverter circuit and achieving waveform inversion so as to facilitate filtering and amplification of a tiny signal; and MCU sampling direct current voltage signals of the two electrode plates. The method adopts an approach of determining a time point of signal inversion and determining an absolute value of a difference between two signals so as to determine whether a center signal has actually arrived. The detection method has characteristics such as being succinct, stable, and interference-resistant.
Inventors:
GUO MINGFENG (CN)
CHEN ZHIHONG (CN)
ZENG FANJIAN (CN)
HUANG HAILIN (CN)
CHEN ZHIHONG (CN)
ZENG FANJIAN (CN)
HUANG HAILIN (CN)
Application Number:
PCT/CN2017/086833
Publication Date:
January 04, 2018
Filing Date:
June 01, 2017
Export Citation:
Assignee:
ZHANGZHOU EASTERN INTELLIGENT METER CO LTD (CN)
International Classes:
G01V3/08; G01R27/26
Foreign References:
| CN106154336A | 2016-11-23 | |||
| CN105334538A | 2016-02-17 | |||
| US4099118A | 1978-07-04 | |||
| EP0749586A1 | 1996-12-27 | |||
| EP1975606A2 | 2008-10-01 | |||
| US20070210785A1 | 2007-09-13 |
Attorney, Agent or Firm:
BEIJING KUAIZHIHUI IP AGENCY CO., LTD (CN)
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