Non-contact high-sensitivity alarm, design and application method based on human body capacitive sensing

A non-contact, human body capacitance technology, applied in the direction of electric alarms, etc., can solve the problems of thieves not knowing where the alarms are hidden, the sensor sensitivity is not high enough, the sensor installation is obvious, etc., to achieve poor environmental adaptability and concealment. Good performance and wide detection range

Active Publication Date: 2021-02-12
JIANGSU UNIV
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these sensors have the following disadvantages: (1) The detection range is small; (2) The installation of the sensor is obvious and not concealed enough; (3) The sensitivity of the sensor detection is not high enough; (4) False alarms may occur
However, places like large museums, auctions, high-end jewelry stores, etc., where valuables are often displayed, hope to use non-contact induction alarms that are small and difficult to be found. When a thief enters a certain distance from the item, the alarm will be triggered immediately. , and the thieves don't know where the alarm is hidden

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Non-contact high-sensitivity alarm, design and application method based on human body capacitive sensing
  • Non-contact high-sensitivity alarm, design and application method based on human body capacitive sensing
  • Non-contact high-sensitivity alarm, design and application method based on human body capacitive sensing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] Below in conjunction with accompanying drawing and example the present invention will be further described:

[0044] figure 1 It is the circuit diagram of the LC parallel circuit connected with the metal plate. The circuit mainly includes a 10uH inductor and a 33pF capacitor. They are connected in parallel. A metal plate is connected in parallel at both ends of the capacitor and drawn out. Since the human body can be regarded as a charged body, the metal plate and the human body can be connected in parallel. Approximately regarded as a parallel plate capacitor. When the human body is close to the metal plate, the capacitance of the capacitor will change, thereby causing the frequency of the LC parallel resonance to change, and an alarm will be triggered to alarm. The above is the basic principle of the present invention.

[0045] figure 2 It is a system connection block diagram of the present invention. The figure includes five parts: LC parallel resonant circuit p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a non-contact high-sensitivity alarm based on human body capacitance induction, a design and a use method. Firstly, a formula between the sensitivity of a parallel plate capacitor and pole plate spacing is derived, and then the sensitivity of a variable pole spacing capacitor is obtained. An LC parallel circuit is constructed, the two ends of a capacitor of the circuit areconnected in parallel and a metal pole plate is led out, when the distance between a person and the metal pole plate changes, the value of the capacitance further changes, and the capacitance value ofthe capacitor is further determined by measuring the frequency of LC parallel resonance. Single linear interpolation is adopted to fit the linear relationship between induction capacitance and induction distance. When a human body is close to or far away from the metal pole plate, the capacitance value changes, so that the circuit resonance frequency changes, and thus an alarm is triggered. The non-contact high-sensitivity alarm adopts the LC parallel circuit resonance to measure resonance frequency and has the characteristics of high anti-interference capability, good environmental adaptability and the like, and the non-contact high-sensitivity alarm can be produced on a large scale and has great market potential.

Description

technical field [0001] The invention relates to a non-contact high-sensitivity induction alarm based on human body capacitance, its design and use method, which belongs to the field of electronic design and is used for anti-theft alarms on high-end exhibits. Background technique [0002] Anti-theft alarm has always been a necessary guarantee for maintaining social order. At present, with the development of televisions and cameras, closed-circuit monitoring systems have gradually grown. In the short decades of development of the closed-circuit monitoring system, along with the continuous impact of the new technology revolution, it has experienced one-to-one monitoring system, control circuit system, processor monitoring system, external multimedia monitoring system, transitional The stage of digital video surveillance system and digital media surveillance management system. [0003] The alarm detector is composed of a sensor and a signal processing circuit. It is used to de...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G08B13/26
Inventor 沈跃张建峰董毅超秦雯许一航朱亚铭
Owner JIANGSU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products