CN209928435U

CN209928435U - Fall detection device based on RFID

Info

Publication number: CN209928435U
Application number: CN201921069959.5U
Authority: CN
Inventors: 周迎; 丁烈云; 骆汉宾; 彭小英
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2020-01-10
Anticipated expiration: 2029-07-09

Abstract

The utility model belongs to the RFID detection area to a detection device tumbles based on RFID is disclosed. The device includes body, RFID passive label, RFID antenna and read write line, wherein: the RFID passive tags are used for receiving electromagnetic wave signals sent by the RFID antenna and feeding back the received electromagnetic wave signals to the RFID antenna, the reader-writer is connected with the RFID antenna and used for reading the electromagnetic wave signals received by the RFID passive tags fed back by the RFID antenna, and when an object to be detected falls down, the falling state of the object to be detected is judged according to the number and the position of the RFID passive tags of the electromagnetic wave signals which are not read by the reader-writer. Through the utility model discloses, it is big to intervene nature among the solution prior art, lacks privacy protection and dresses inconvenient problem.

Description

Fall detection device based on RFID

Technical Field

The utility model belongs to the RFID detection area, more specifically relates to a detection device tumbles based on RFID.

Background

The aging of the population has become a prominent hot problem in the world today, where falls are important factors affecting the health of the elderly. Especially, if the old falls over, if no one is helped and the old is unable to save oneself, the old can keep the prone position for a long time, sequela is left, and the serious people can be paralyzed or endanger the life. The method not only influences the health of the old people, so that the old people are afraid of falling down to generate psychological burden, but also causes the increase of medical expenses and medical cost, therefore, the falling-down detection of the old people is beneficial to the physical and psychological health, and the shortage of medical resources can be relieved.

Currently, fall detection technologies are mainly classified into the following three types:

(1) detection method based on video image sequence. The method mainly arranges detection equipment in an environment, wherein the detection equipment mainly comprises a color camera and a depth camera. The color camera can shoot images of human body in motion, and change degrees of human body parts are calculated through simplified processing of the human body parts in the images so as to judge whether the human body falls down. The depth camera collects depth images of a human body, three-dimensional coordinates of human joint points are recorded in real time by using a skeleton tracking technology, and falling events are judged by using the coordinates. Although the detection method is high in accuracy rate and cannot influence the daily activities of the old, on one hand, the privacy of people can be invaded, and on the other hand, the detection method is also easily influenced by the surrounding environment, such as camera dead angles, object shielding and other factors, so that the report is missed; (2) a fall detection method based on wearable equipment. The method mainly comprises the steps of placing detection equipment on a human body part, and obtaining data such as acceleration, angular velocity and magnetic field intensity of the human body through sensors worn on the human body, such as a three-axis accelerometer, a three-axis gyroscope, a three-axis magnetometer and the like to identify the motion state and the posture of the worn part so as to judge the falling behavior. The method is not limited by space, does not infringe personal privacy, can accurately carry out fall detection in real time, has large human life intervention, reduces the comfort of a user, has larger influence on the detection result by the wearing position, and has large error once the wearing position is incorrect; (3) a detection method based on an environmental sensor. According to the method, equipment such as a pressure sensor and an audio sensor are distributed in the environment to capture activity information of a human body so as to identify falling behaviors. Because the sound source is wide and the number of interferents is large, the method is greatly interfered by external conditions, and the false alarm rate of the detection result is high.

SUMMERY OF THE UTILITY MODEL

To the above defect of prior art or improve the demand, the utility model provides a detection device tumbles based on RFID through set up intensive distribution's RFID passive label in the body, detects the position and the quantity of the RFID passive label that does not receive electromagnetic wave signal through the read write line, judges the position appearance that waits to detect the object and tumble, and it is big to solve intervenient nature among the prior art from this, lacks privacy protection and dresses inconvenient problem.

In order to achieve the above object, according to the utility model discloses, a fall detection device based on RFID is provided, the device includes body, RFID passive tag, RFID antenna and read write line, wherein:

the RFID passive tags are arranged above the body and used for transmitting electromagnetic wave signals, the RFID passive tags are used for receiving the electromagnetic wave signals transmitted by the RFID antennas and feeding the received electromagnetic wave signals back to the RFID antennas, the reader-writer is connected with the RFID antennas, on one hand, information of the electromagnetic wave signals to be transmitted is transmitted to the RFID antennas, so that the RFID antennas transmit the electromagnetic wave signals according to the information, on the other hand, the electromagnetic wave signals received by the RFID passive tags fed back by the RFID antennas are received and read, and when an object to be detected falls down, the falling state of the object to be detected is judged according to the number and positions of the RFID passive tags of the electromagnetic wave signals which are not read by the reader-writer.

Further preferably, among the plurality of RFID passive tags disposed in the body, a distance between two adjacent RFID passive tags is smaller than a width of the object to be detected.

Further preferably, the body includes two layers, the RFID passive tag being disposed between the layers.

Further preferably, the upper and lower surfaces of the RFID passive tag are covered with protective films for fixing the position of the RFID passive tag in the body while protecting the RFID passive tag.

Further preferably, the state of the object to be detected falling is judged by adopting a heuristic machine learning algorithm.

Further preferably, the number of the RFID antennas is not limited, and may be one or more.

Further preferably, the reader/writer is connected to an external PC terminal, and is configured to transmit the read electromagnetic wave signal to the PC terminal, and the PC terminal processes data.

Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:

1. the utility model discloses a set up the RFID passive label of intensive distribution in the body, detect the number of the RFID passive label that does not receive the electromagnetic wave signal and the profile shape that position formed through the read write line, judge the position appearance that the object to be detected tumbles, do not receive environmental interference, do not invade privacy, as long as in the detection zone, need not any operation, can realize the detection of tumbleing;

2. the device provided by the utility model simple structure, economy is suitable for, and RFID passive label need not the power supply, and it utilizes the radio frequency energy who radiates from the read write line to supply power for its self circuit, then returns the signal of digital identification code and gives the read write line.

Drawings

Fig. 1 is a schematic structural view of an RFID-based fall detection apparatus constructed in accordance with a preferred embodiment of the present invention;

fig. 2 is a block diagram of a fall detection device based on RFID technology constructed in accordance with a preferred embodiment of the present invention;

fig. 3 is a comparison graph of electromagnetic wave signals collected without falling and falling constructed in accordance with a preferred embodiment of the present invention.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:

the RFID tag comprises 1-an RFID passive tag, 2-an RFID antenna, 3-a reader-writer and 4-a body.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

A fall detection apparatus for detecting whether a crowd falls, referring to fig. 1 and 2, the fall detection apparatus comprising: RFID passive tag 1, RFID antenna 2, reader-writer 3 and body 4.

The RFID passive tag 1 is embedded in the body 4 of the detection area, the body in the embodiment adopts a carpet, the carpet is densely arranged, and signal transmission is generated in the tag by reading electromagnetic waves emitted by the RFID antenna.

When a person falls, some RFID passive tags 1 can be covered, so that the reader-writer 3 cannot acquire information of the covered tags, and therefore the falling outline shape of a falling object can be determined by the number of the covered tags and the positions of the passive tags, and the falling behavior can be judged. Based on the principle, the RFID passive tags 1 are arranged densely, and the arrangement interval is not more than the average width of a human body.

In this embodiment, the RFID passive tag 1 should be wrapped by two plastic films, so as to reduce the damage caused by long-term treading by personnel and also play a role in fixing the tag position. In addition, the body should have two layers: a base blanket in contact with the floor, a cover blanket covering the RFID passive tag. The bottom blanket is connected with the ground when being laid, the cover blanket covers all the RFID passive labels, and the size of the bottom film is similar to that of the cover blanket.

The RFID antenna 2 is arranged above the detection area and is used for transmitting signals to form an effective electromagnetic field coverage area; with this arrangement, the RFID passive tag 1 arranged in the carpet can be quickly detected in a short time, and also the probability that the boundary area is easily missed due to the limitation of the radiation range of the RFID antenna 2 can be reduced, considering the radiation range of the RFID antenna 2, a plurality of RFID antennas 2 can be used, and the upward inclination is fixed at a certain angle.

And the reader-writer 3 is used for acquiring the information of the RFID passive tag 1 and transmitting the data, the reader-writer 3 is connected with a USB-to-serial port, and the USB-to-serial port is connected with a PC (personal computer) end. The reader transmits the received data to the PC end through the USB-to-serial port, and the PC end performs analysis processing by using a falling detection algorithm to judge whether the human body falls down.

As shown in fig. 3, white in the left graph in the graph is an electromagnetic signal acquired when the person does not fall, a white area in the right graph in the graph represents a passive tag which cannot receive the electromagnetic signal when the person falls, the white area in the graph is increased, signals indicating more passive tags are shielded by the falling object, and the falling outline of the falling object can be obtained according to the outline of the white area.

The installation process of the fall detection device is as follows:

selecting a lower layer and an upper layer of the body with proper length and width according to the actual size of the detection area, wherein a bottom blanket and a cover blanket are adopted in the embodiment; covering the RFID label with a plastic film up and down, wherein the size of the plastic film is larger than that of the label; fixedly arranging the RFID passive tags in a carpet, wherein the number of the RFID passive tags is determined by the arrangement distance and the size of the carpet, and the arrangement distance is not more than the average width of a human body; two RFID antennas are upwards inclined by a certain angle and fixed above a detection area; the reader-writer is connected with the USB-to-serial port, the USB-to-serial port is connected with the PC end, and the PC end judges whether the tumble happens or not according to a heuristic machine learning algorithm. Thereby, a carpet device is obtained which can be fall-detected.

To sum up, the utility model discloses a fall detection device simple structure lays the convenience, and especially the passive label of RFID is wrapped up by plastic film, not only can reduce because of the personnel trample the harm that brings for a long time, and increase of service life also can play the effect of fixed label position simultaneously. And the used RFID passive tag does not need to be independently powered by a battery and works by means of radio frequency energy sent by a reader-writer. In addition, the falling detection device is not interfered by the environment, does not invade privacy, does not need any operation of any person, and can realize falling detection within the radiation range of the antenna.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. An RFID-based fall detection device, characterized in that the device comprises a body (4), an RFID passive tag (1), an RFID antenna (2) and a reader/writer (3), wherein:

a plurality of RFID passive tags (1) are arranged in the body (4), the RFID antenna (2) is arranged above the body, for emitting electromagnetic wave signals, the RFID passive tag (1) for receiving the electromagnetic wave signals emitted by the RFID antenna, meanwhile, the received electromagnetic wave signals are fed back to the RFID antenna, the reader-writer (3) is connected with the RFID antenna (2), on one hand, the information of the electromagnetic wave signals to be transmitted is transmitted to the RFID antenna (2), so that the RFID antenna (2) emits electromagnetic wave signals according to the information, on the other hand, receives and reads the electromagnetic wave signals received by the RFID passive tag (1) fed back by the RFID antenna (2), and judging the falling state of the object to be detected according to the number and the position of the RFID passive tags of the electromagnetic wave signals which are not read by the reader-writer.

2. An RFID-based fall detection apparatus as claimed in claim 1, wherein a plurality of RFID passive tags (1) are arranged in the body (4), the distance between two adjacent RFID passive tags being less than the width of the object to be detected.

3. An RFID-based fall detection device according to claim 1 or 2, wherein the body comprises two layers, the RFID passive tag (1) being arranged between layers.

4. An RFID-based fall detection apparatus as claimed in claim 1, wherein the upper and lower surfaces of the RFID passive tag (1) are covered with protective films for fixing the position of the RFID passive tag in the body while protecting the RFID passive tag.

5. An RFID-based fall detection device according to claim 1, wherein the number of RFID antennas (2) is not limited and can be one or more.

6. An RFID-based fall detection device as claimed in claim 1, wherein the reader/writer (3) is connected to an external PC terminal for transmitting the read electromagnetic wave signals to the PC terminal, and the PC terminal processes the data.