CN104639579A - Method and system for transmitting energy of sensor network by using body surface channel - Google Patents
Method and system for transmitting energy of sensor network by using body surface channel Download PDFInfo
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- CN104639579A CN104639579A CN201310556493.2A CN201310556493A CN104639579A CN 104639579 A CN104639579 A CN 104639579A CN 201310556493 A CN201310556493 A CN 201310556493A CN 104639579 A CN104639579 A CN 104639579A
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Abstract
The invention discloses a method and a system for transmitting energy of a sensor network by using a body surface channel. The method comprises the following steps of (1) placing a passive sensor without batteries on a person to be measured, placing an electrode of the passive sensor on the body surface of the person to be measured or in the body of the person to be measured, placing a sensor controller with a battery and an electrode on the person to be measured, and placing the electrode controlled by the sensor on the body surface of the person to be measured; (2) transmitting signals to the sensor controller by using a remote wireless control end and starting the sensor controller; (3) transmitting carrier energy to the passive sensor by using the sensor controller through the electrode, which is adhered to the body surface of the person to be measured, of the sensor controller; (4) transmitting the carrier energy to the electrode of the passive sensor through the body surface channel of the person to be measured; and (5) converting the carrier energy into working voltage by using the passive sensor so as to provide energy for the passive sensor. The method and the system for transmitting the energy of the sensor network by using the body surface channel has the advantages of high transmitting efficiency, high convenience and safety, low cost, wide application range and the like.
Description
Technical field
The present invention relates to a kind of method and system utilizing body surface channel to carry out sensor network energy transmission, can be applicable to the sensor network of the animal comprising the mankind or wearable medical monitoring system, body surface channel is utilized to transmit the energy that the transmitter being affixed on skin surface is launched, and at the method and apparatus that terminal is collected energy.
Background technology
Sensor network and wearable medical monitoring system are collecting due to it health data comprising the animal of the mankind, and the important function in disease forecasting and early diagnosis is an important topic in medical electronics application study always.Based on low cost, the Radio Transmission Technology of low-power consumption and system schema contribute to the basic life parameters of patient's Real-time Collection health in routine work, life, by reducing the aspectant interrogation time between doctors and patients thus raising the efficiency, alleviate the contradiction of inadequate resource.For other animals, then facilitate every sign of human observer Real-Time Monitoring animal, increase work efficiency, reduce work difficulty.
Sensor network is made up of various wearable sensors and Network Central Controller, transducer detecting temperature, the virtual signals such as heart rate, and Network Central Controller collects storage and processing signals.Transducer can be distributed in each position of animal, and usual transducer can be divided three classes: active, and half is active, passive.Active sensor and half active sensor is battery-powered carries out work.The existence of chemical cell can produce several shortcoming: 1. the weight and the volume that add single-sensor; 2. reduce reliability and limit its life-span; 3. add device cost.And there is a large number of patient also to there is conflict for directly contacting chemical cell on skin, inevitably also there is chemical cell chemical spills, react with biological tissue and wait danger.And passive sensor is powered by external power source, avoid above Problems existing, therefore, passive sensor is for applying existence very large advantage future widely.
Traditional passive sensor is by far field antenna or near field antenna received RF signal for circuit provides signal and energy, and as Fig. 1, the mechanism of near field antenna transmitting energy is electromagnetic coupled, and distance is shorter; The transmission range of far field antenna is longer, but the aerial decay of electromagnetic wave be proportional to 1/d3(wherein d represent object to launch point to the distance of acceptance point), energy loss is very fast, and this is a severe problem for Energy Transfer conversion efficiency.
Human body sensor network (the Fan Zhang of super low-power consumption was once in the research group that Benton Calhoun teaches, Brian Otis, Benton Calhoun, " A Batteryless19 μ W MICS/ISM-Band Energy Harvesting Body Area Sensor Node SoC ", ISSCC2012, SESSION17), by far-field emission provide energy form achieve junction sensor passive, but larger path attenuation makes the energy hole of whole transducer in microwatt magnitude, limits the realization of sensor complex function.
To sum up, a kind of channel is needed compared with the Energy Transfer scheme of small path attenuation characteristic to improve the performance of whole system.
Summary of the invention
The invention provides a kind of method and system utilizing body surface channel to carry out sensor network energy transmission.Body surface channel refers to energy and signal using the biosphere of skin surface and nearly skin surface as the medium of transmission and passage, for human body, as shown in Figure 2.Skin corium under the cuticula and epidermal area of human body, it has higher conductivity to make the path attenuation of body surface channel less, less path attenuation will put forward high-octane efficiency of transmission greatly, compared to other wireless transmission methods, make the transmission range when transmitting power is fixing farther, or when received power is identical, only need less transmitting power.Test result as shown in Figure 3, as seen from the figure, in 10MHz to 100MHz frequency range, when energy one timing transmitted, the energy using traditional antenna transmission to receive is much smaller than the energy received by body surface channel, and along with the increase of transmission range, the energy attenuation received by body surface channel is very little.
Technical scheme of the present invention is:
Utilize body surface channel to carry out a method for sensor network energy transmission, the steps include:
1) arrange not containing the passive sensor of battery with it person to be measured, the electrode of this passive sensor be located at this person's body surface to be measured or
In body; The body of this person to be measured arranges sensor controller, and described sensor controller is provided with battery and electrode,
The electrode that this transducer controls is located on this person's body surface to be measured;
2) remote wireless control end sends signal to described sensor controller, starts described sensor controller;
3) electrode that described sensor controller is affixed on this person's body surface to be measured by it sends carrier energy to described passive sensor;
4) described carrier energy passes through the electrode of body surface transmission to described passive sensor of this person to be measured;
5) described carrier energy is converted to operating voltage and provides the energy for self by described passive sensor.
Further, described body surface channel is the skin corium of this person to be measured; The frequency range of described carrier energy is 10MHz ~ 100MHz.
Further, the electrode of described passive sensor is connected by described body surface channel with the electrode of described sensor controller; Described electrode is coat the electrode of elargol or the electrode with miniature pinpoint array.
Further, described passive sensor comprises the rectification circuit for described carrier energy being converted to direct voltage.
Further, described passive sensor is the vitro passive transducer that this person to be measured carries with or the passive sensor implanted in this person's body to be measured.
Further, described sensor controller comprises power amplifier and impedance matching circuit; The electrode of described sensor controller is connected with described power amplifier by described impedance matching circuit.
Further, the measuring-signal that described remote wireless control end sends over by described sensor controller sends to described passive sensor by described body surface channel; Described passive sensor gathers the signal of this person to be measured according to described measuring-signal, and gathered signal is sent to described sensor controller by described body surface channel; Then described sensor controller sends it to described remote wireless control end.
Utilize body surface channel to carry out a system for sensor network energy transmission, it is characterized in that comprising remote wireless control end, for be arranged at person to be measured sensor controller with it and for be arranged at person to be measured with it not containing the passive sensor of battery; The electrode of this passive sensor is located in this person's body surface to be measured or body, wherein, described remote wireless control end is communicated to connect by communication and described sensor controller, and described sensor controller is provided with battery and the electrode for being arranged at this person's body surface to be measured; During work, the electrode of this sensor controller is communicated to connect by the body surface channel of this person to be measured and described passive sensor.
To achieve these goals, principle of the invention schematic diagram as shown in Figure 4, utilize body surface channel to transmit the energy that the sensor controller being affixed on skin surface is launched, and at the method and apparatus that terminal is collected energy, comprise energy launch and accept interface and energy-transmission channel.The function that energy launches interface is by transmitter emitted energy signal, and can in energy signal modulate information, amplified by power amplifier, via impedance matching network and the emission electrode that is affixed on skin surface by energy with as far as possible with little loss input body surface channel.Input energy meets human-body safety standard, and under the prerequisite that can receive enough energy, supply current can not produce injury to human body or animal.Energy acceptance interface is to be affixed on skin surface or the electrode detection of passive sensor that implants by body surface transmission to the energy signal of far-end, the energy collected is passed through matching network, little as far as possible loss by passive sensor collecting electrode received energy and supply circuit settling signal gather, transmission, stores and other monitoring functions.The exchange interface of body surface channel and system is the contact position of electrode and skin, and body surface channel connects emission electrode and collecting electrode as the transmission medium of energy signal, completes transducer and is connected with the signal path of controller.
Compared with prior art, the present invention has the difference of essence on Power supply passage.Advantage of the present invention and good effect as follows:
1) efficiency of transmission is high: the supply power mode adopting air passage compared to conventional passive sensor, the present invention greatly improves efficiency of transmission, make the transmission range when transmitting power is fixing farther, or when received power is identical, only need less transmitting power.For biologic applications, this means that the corresponding raising of feedback efficiency is collected in system information process.Substantially increase the performance of whole system.
2) convenience fail safe is good: adopt body surface channel energy transmission means, for junction sensor, can meet simultaneously obtains larger Power supply and do not use chemical cell, reduce the volume and weight of junction sensor.And eliminate directly and the chemical cell that contacts of skin, avoid potential risks.Due to higher efficiency of transmission, the energy of transmission can reduce relatively, meets human body and animal body to the safety standard of electric current, ensures the safety of human body and animal body.
3) cost is low: the existence eliminating battery, greatly reduces the cost of individual node transducer.
4) applied widely: the contact interface of transducer and skin can adopt various types of electrode, can be placed in each position of organism.As long as channel exists, just can greater efficiency transmission signal.
Accompanying drawing explanation
Fig. 1 tradition by antenna received RF signal for circuit provides the schematic diagram of signal and energy.
Fig. 2 body surface is for radio channel schematic diagram.
Fig. 3 powers for arm body surface channel and compares schematic diagram with antenna for electrical test data.
The wearable medical monitoring system schematic diagram that Fig. 4 powers based on body surface.
Fig. 5 a specific embodiment of the present invention schematic diagram.
Embodiment
Below by embodiment also by reference to the accompanying drawings, the present invention is described in detail.
The present embodiment is a kind of electrocardiogram (ECG) system utilizing body surface channel to power.Traditional electrocardiogram needs 16 electrodes, and be connected by electrical wiring on recording assay device, detecting step is loaded down with trivial details, and a lot of lines is made troubles to patient, more impossiblely accomplishes real-time detection, and family uses also hardly may.
Adopt technology herein, the electrocardio real-time monitoring system of novel wireless power and transmission of wireless signals as shown in Figure 5.This system is worn on the controller containing battery with electrode on human body by one, 16 be integrated with microsensor circuit but containing battery, form with the passive sensor of electrode and Remote Data Analysis control terminal.Wherein, the controller be worn on human body by electrode, can send control command and energy via body surface channel to microsensor, and send data by sky alignment Remote Data Analysis control terminal; Microsensor receives the order and energy of being sent by controller by electrode, gather electrocardiosignal and by electrode via body surface transmission to controller; The controller with electrode that Remote Data Analysis control terminal is worn on human body by sky alignment sends order and receives its data-signal sended over, and analyzes and shows the people such as patient or doctor, as diagnosis basis.The Electrodes of passive sensor is the smaller the better, existing electrode can be continued to use, or the electrode (increase conductivity) of elargol or the electrode (the dead skin layer that miniature needle point can penetrate human epidermal arrives skin corium, increases conductivity) with miniature pinpoint array are coated in employing.
The course of work of this system is:
(1) controller that Remote Data Analysis control terminal is worn on human body by sky alignment sends the order starting to measure electrocardiosignal;
(2) controller be worn on human body have received order by antenna, and by being attached to the electrode of human epidermal, sends the carrier energy of measuring command and certain amplitude to microsensor;
(3) body surface channel is less for the decay of the signal of specific band, microsensor containing battery collects enough large measuring command of sending from controller and carrier energy by electrode, by rectification circuit, carrier energy is become direct voltage, for microsensor work provides the energy, and by measuring command that related circuit process receives;
(4) microsensor (passive sensor 1 and 2 is example as shown in Figure 5) gathers human ecg signal by electrode, and by electrode, sends to the controller be worn on human body via body surface channel;
(5) controller be worn on human body receives the inverse signal of microsensor by electrode, pass to Remote Data Analysis control terminal via antenna;
(6) Remote Data Analysis control terminal receives by antenna the signal that the microsensor that sends from the controller that is worn on human body detects, and through data processing, presents to patient or doctor etc.
Because microsensor is not containing battery, only have electrode and micro integrated circuit, it is very little that its volume can do, and be attached on human body skin, owing to not having electric wire to be connected, human body can voluntary activity.The controller be worn on human body only contains battery, and antenna and control chip, cumulative volume is also not too large, can tie up in the large arm of people or loins.The terminals such as Remote Data Analysis control terminal then can matching computer, smart mobile phone use, real time record analysis, share data.Native system is not containing live wire, and power supply and Signal transmissions, all by body surface and wireless mode, can not bring discomfort to measured, and measured can be freely movable, and supervisory control system can work at any time, brings great convenience to measured.
Above-described embodiment is only the principle in order to technical solution of the present invention is described, not in order to limit the present invention, all any equal changes done within the spirit and principles in the present invention and amendment, all should belong to protection scope of the present invention.
Claims (10)
1. utilize body surface channel to carry out a method for sensor network energy transmission, the steps include:
1) arrange with it not containing the passive sensor of battery person to be measured, the electrode of this passive sensor is located in this person's body surface to be measured or body; The body of this person to be measured arranges sensor controller, and described sensor controller is provided with battery and electrode, and the electrode of this sensor controller is located on this person's body surface to be measured;
2) remote wireless control end sends signal to described sensor controller, starts described sensor controller;
3) electrode that described sensor controller is affixed on this person's body surface to be measured by it sends carrier energy to described passive sensor;
4) described carrier energy passes through the electrode of body surface transmission to described passive sensor of this person to be measured;
5) described carrier energy is converted to operating voltage and provides the energy for self by described passive sensor.
2. the method for claim 1, is characterized in that described body surface channel is the skin corium of this person to be measured; The frequency range of described carrier energy is 10MHz ~ 100MHz.
3. the method for claim 1, is characterized in that the electrode of described passive sensor is connected by described body surface channel with the electrode of described sensor controller; Described electrode is coat the electrode of elargol or the electrode with miniature pinpoint array.
4. method as claimed in claim 3, is characterized in that described passive sensor comprises the rectification circuit for described carrier energy being converted to direct voltage; The implanted passive transducer that described passive sensor is vitro passive transducer or implants in this person's body to be measured.
5. the method for claim 1, is characterized in that described sensor controller comprises power amplifier and impedance matching circuit; The electrode of described sensor controller is connected with described power amplifier by described impedance matching circuit.
6. the method as described in as arbitrary in claim 1 to 5, is characterized in that the measuring-signal that described remote wireless control end sends over by described sensor controller sends to described passive sensor by described body surface channel; Described passive sensor gathers the signal of this person to be measured according to described measuring-signal, and gathered signal is sent to described sensor controller by described body surface channel; Then described sensor controller sends it to described remote wireless control end.
7. utilize body surface channel to carry out a system for sensor network energy transmission, it is characterized in that comprising remote wireless control end, for be arranged at person to be measured sensor controller with it and for be arranged at person to be measured with it not containing the passive sensor of battery; The electrode of this passive sensor is located in this person's body surface to be measured or body, wherein, described remote wireless control end is communicated to connect by communication and described sensor controller, and described sensor controller is provided with battery and the electrode for being arranged at this person's body surface to be measured; During work, the electrode of this sensor controller is communicated to connect by the body surface channel of this person to be measured and described passive sensor.
8. system as claimed in claim 7, is characterized in that described body surface channel is the skin corium of this person to be measured; The frequency range of described carrier energy is 10MHz ~ 100MHz.
9. system as claimed in claim 7 or 8, is characterized in that the electrode of described passive sensor is connected by described body surface channel with the electrode of described sensor controller; Described electrode is coat the electrode of elargol or the electrode with miniature pinpoint array.
10. system as claimed in claim 7 or 8, is characterized in that described passive sensor comprises the rectification circuit for described carrier energy being converted to direct voltage; Described sensor controller comprises power amplifier and impedance matching circuit; The electrode of described sensor controller is connected with described power amplifier by described impedance matching circuit.
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| CN101094606A (en) * | 2004-11-04 | 2007-12-26 | L&P100有限公司 | Medical devices |
| CN101977544A (en) * | 2008-01-09 | 2011-02-16 | 纳米识别技术股份公司 | Detection device for vital signs |
| CN201446077U (en) * | 2009-05-26 | 2010-05-05 | 常州碳酸钙有限公司 | Strickling board type flour sieving machine |
| US20130060098A1 (en) * | 2009-12-23 | 2013-03-07 | Delta, Dansk Elektronik, Lys Og Akustik | Monitoring device |
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