CN214180021U

CN214180021U - Intelligent carpet based on electrode array

Info

Publication number: CN214180021U
Application number: CN202021336566.9U
Authority: CN
Inventors: 刘红星; 刘乐; 魏宏利
Original assignee: Suzhou Greede Medical Sensor Technology Co ltd
Current assignee: Suzhou Greede Medical Sensor Technology Co ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-09-14
Anticipated expiration: 2030-07-09

Abstract

An intelligent carpet is composed of a carpet body and a ground dynamic sensing system, and is characterized in that (1) the ground dynamic sensing system is composed of a sensor array, a signal conditioning circuit, an analog-to-digital converter (AD), a processor and other components which are arranged under the carpet, and (2) a pair of electrodes are arranged at the center of each monitoring area unit of a monitoring area under the carpet and used as sensors of the monitoring area unit to monitor the potential difference change of the electrodes; (3) determining a judgment threshold value for the action on the ground based on the basic noise condition of each monitoring area unit when the ground is not in action monitored by the ground dynamic sensing system; (4) and when the recorded potential difference signals of the monitoring area units are larger than the judgment threshold value, positioning the actor according to the sequencing of the magnitude of the potential difference signals of the monitoring area units, and judging one or more monitoring area units with the largest potential difference signals as the position of the actor.

Description

Intelligent carpet based on electrode array

Technical Field

The application relates to an intelligent carpet.

The house and the rest homes gradually develop towards the direction of intellectualization, and the intellectualization of carpets is one aspect. Compared with the traditional carpet, the intelligent carpet has more sensors to sense things happening on the ground, such as falling down of old people, burglary and the like.

Background

One implementation of smart carpet is to use smart pressure sensitive flooring under traditional carpet. As the name suggests, the intelligent pressure sensing floor uses a pressure sensor, and judges the condition on the ground by detecting the pressure from the ground, such as the fall of the old, the identification of ground personnel and the like. Its advantages are high response to pressure when the person is not moving, and low sensitivity to movement of person.

There is also an intelligent carpet based on electromagnetic tomography. Electromagnetic Tomography (EMT) is a process Tomography technique based on the principle of Electromagnetic induction, and aims to study the spatial distribution of substances with Electromagnetic properties; a typical EMT system can be divided into four parts: the device comprises a sensor array (namely a detection exciting coil), a system control circuit, a data acquisition and processing circuit and an image reconstruction and characteristic parameter extraction unit. The method is used for intelligent carpets, needs exciting coils and is complex in technology. Real-time performance is not high, and thus, human actions are relatively insensitive.

The literature also introduces an intelligent carpet, which is based on sensors to sense the electric field changes. However, it is unknown how the electric field comes, whether the electric field is used for active detection, what the sensor is, how the sensor is arranged, whether the positioning function exists, and the like.

Disclosure of Invention

The invention aims to provide a novel method.

A new intelligent carpet scheme is provided, which is easy to realize and is relatively sensitive to human actions.

The technical scheme is as follows.

The natural law utilized by the scheme is as follows: (1) when a person moves on the ground, including falling, walking, etc., static electricity is generated and changes along with the movement; (2) the inventor practice finds that the static electricity and the change thereof are large enough to be utilized; (3) electrostatic changes accompanying motion, including changes in the potential difference (i.e., voltage) between two points in its electrostatic field; (4) the closer the monitoring area unit is to the action source, namely the static electricity source, the larger the induced potential difference signal is.

Has the beneficial effects.

An intelligent simple carpet device based on the change of the induced potential difference of the electrode array is built, and the detailed embodiment is shown.

And (5) testing experiments. The testee tramples on 1#, 2#, 3#, 4# foam ground mat respectively, and the foam ground mat is as the carpet body, and the ground developments perception system of intelligent carpet gathers the potential difference signal data of four pairs of electrodes under four pieces of ground mats under four kinds of circumstances respectively. Obviously, when the floor mat is treaded, the signal of the corresponding channel on the computer display is much larger. This illustrates the effectiveness of the invention in monitoring the actions of ground people and locating people accordingly.

Drawings

FIG. 1 is a logic block diagram of a scheme for sensing potential difference change based on an electrode array.

Fig. 2 is a schematic view of a 1# floor mat treaded and the sensing result thereof.

Fig. 3 is a schematic view of the treading of a 2# floor mat and the sensing result.

Fig. 4 is a schematic diagram of the stepping on a 3# floor mat and the sensing result.

Fig. 5 is a schematic diagram of the stepping on a 4# floor mat and the sensing result.

Detailed Description

Splicing 4 foam ground mats to serve as a carpet, adhering a pair of sensing electrodes on the back surface of each ground mat, and leading out connecting wires of the 4 pairs of sensing electrodes to be connected to a signal conditioning module; the induction electrode is made into a two-layer PCB board with the length of 10cm multiplied by 10cm, and two rectangular areas of a top layer of the induction electrode are coated with copper to be used as electrodes; each pair of electrodes is connected to an analog input port of the NI USB 4431, the input mode is pseudo-differential, and the NI USB 4431 acquisition board card serves as a signal conditioning and analog-to-digital conversion (AD) module; the NI USB 4431 is connected to a notebook computer through a USB, the notebook computer is used as a processor, and potential difference signals recorded by each pair of electrodes are displayed on a display screen by programming a processing program for the notebook computer. Fig. 2, fig. 3, fig. 4 and fig. 5 are schematic diagrams illustrating the position and the result of the ground motion monitoring.

This embodiment is merely an example. When the system is specifically implemented, other forms of conditioning circuits and processors can be matched. The specific form of the carpet body and the ground dynamic sensing system can be different, for example, another film can be laid under the carpet body, and the electrode array can be arranged on the film.

Claims

1. An intelligent carpet is composed of a carpet body and a ground dynamic sensing system, and is characterized in that (1) the ground dynamic sensing system is composed of a sensor array, a signal conditioning circuit, an analog-to-digital converter (AD), a processor and other components which are arranged under the carpet, and (2) a pair of electrodes are arranged at the center of each monitoring area unit of a monitoring area under the carpet and used as sensors of the monitoring area unit to monitor the potential difference change of the electrodes; (3) determining a judgment threshold value for the action on the ground based on the basic noise condition of each monitoring area unit when the ground is not in action monitored by the ground dynamic sensing system; (4) and when the recorded potential difference signals of the monitoring area units are larger than the judgment threshold value, positioning the actor according to the sequencing of the magnitude of the potential difference signals of the monitoring area units, and judging one or more monitoring area units with the largest potential difference signals as the position of the actor.