CN103230270A - Capacitor electrode for detecting electrocardiogram signals of motorist - Google Patents
Capacitor electrode for detecting electrocardiogram signals of motorist Download PDFInfo
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- CN103230270A CN103230270A CN2013101792997A CN201310179299A CN103230270A CN 103230270 A CN103230270 A CN 103230270A CN 2013101792997 A CN2013101792997 A CN 2013101792997A CN 201310179299 A CN201310179299 A CN 201310179299A CN 103230270 A CN103230270 A CN 103230270A
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Abstract
The invention discloses a capacitor electrode for detecting electrocardiogram signals of a motorist. The capacitor electrode for detecting the electrocardiogram signals of the motorist comprises a supporting component, a signal detecting component and a buffer component, wherein the supporting component is composed of a metal plate; the signal detecting component is composed of a double-sided PCB (printed circuit board) with a voltage snubber circuit, the voltage snubber circuit is arranged on the bottom surface of the PCB and comprises CMOS (Complementary Metal-Oxide-Semiconductor Transistor) type double precision operational amplifiers with high input impedance and low noise; and the buffer component is composed of springs and is used for connecting the supporting component and the signal detecting component. The capacitor electrode for detecting the electrocardiogram signals of the motorist utilizes the double-sided PCB as the signal detecting component so that the structure is simple and the cost is low; utilizes springs as the buffer component so that the motion artifact caused by the body movement of a detected object during a signal detecting process is effectively restrained; and utilizes the mental plate as the supporting component so that not only a supporting function is achieved, but also an electromagnetic shielding function for the signal detecting component is achieved.
Description
Technical field
The invention belongs to bioelectrical signals detection technique field, relate to a kind of capacitance electrode for detection of driver's electrocardiosignal.
Background technology
Electrocardiosignal by the monitoring driver can detect its degree of fatigue, and then prevents fatigue driving.The skin that tradition electrocardio detection method adopts metal electrode directly to contact measurand more obtains signal, and the particularity of driving environment does not then allow to adopt this traditional detection method.
In recent years, contactless electrocardio detection technique begins fast development, makes just can detect its electrocardiosignal by the skin that need not to contact measurand.Contactless electrocardio detection technique is utilized the Capacitance Coupled principle, with the form detection electrocardiosignal of displacement current.
As shown in Figure 1, detect sketch map for contactless electrocardio.The clothes 2 that capacitance electrode 1, measurand are worn, the skin 3 of measurand form coupling capacitance C together
S, the electrocardiosignal of measurand is passed through C
SBe coupled to the input of signal processing circuit.Because the impedance of coupling capacitance is very big in the frequency band range of electrocardiosignal, so capacitance electrode should be designed to have the active electrode of voltage buffer circuit, to improve its input impedance; Because the input impedance of capacitance electrode is very big, cause its noise jamming to the outside especially responsive, therefore when the design capacitance electrode, must design corresponding shielding construction; In addition, when the health of measurand moved, the capacitance of coupling capacitance changed, and caused occurring in the output signal motion artifacts, how to suppress motion artifacts, also was the problem that need consider when the design capacitance electrode.
Existing capacitance electrode design adopts three kinds of methods to shield interference mostly: adopt pcb board structure more than 3 layers or 3 layers; In voltage buffer circuit, add complicated feedback network; Metallic shield is installed in bottom surface at capacitance electrode.First method has improved the cost of manufacture of capacitance electrode greatly; Second method makes the circuit structure of capacitance electrode become complicated, and too much electronic device can introduce much noise, if design unreasonablely, can reduce the interference free performance of capacitance electrode on the contrary; The third method makes the frame for movement of capacitance electrode become complicated, has influenced the application flexibility of capacitance electrode greatly.In addition, existing capacitance electrode design only comprises signal detecting part mostly, and does not have buffer unit, when being used for signal detection, and the capacitance electrode fixed placement, not movable, the light exercise of measurand health will cause tangible motion artifacts.When detecting driver's electrocardiosignal, road jolts and causes the vibrations of automobile, causes driver's health to move, and how suppressing the motion artifacts that body kinematics causes is the key issue that driver's electrocardiosignal detects needs consideration.
Summary of the invention
The object of the present invention is to provide a kind of simple in structurely, with low cost, and can suppress the capacitance electrode for detection of driver's electrocardiosignal of motion artifacts.
Capacitance electrode for detection of driver's electrocardiosignal of the present invention is made of support component, signal detecting part and buffering parts; Described support component is made of metallic plate; Described signal detecting part is made of the two-sided pcb board that has voltage buffer circuit, and voltage buffer circuit is arranged on the bottom surface of pcb board, is made up of high input impedance, low noise, CMOS type, double operational precision amplifier; Described buffer unit is made of spring, is used for connecting support component and signal detecting part.
The end face of described two-sided pcb board covers the copper film of one deck center hollow out, covers welding resistance printing ink on the copper film.
The bottom surface of described two-sided pcb board covers the copper film of one deck center hollow out, covers welding resistance printing ink on the copper film.
Described voltage buffer circuit is arranged on the hollow out place of pcb board bottom surface copper film, comprises operational amplifier A 1, operational amplifier A 2, input protection capacitor C 1, capacitance C2, the first isolation resistance R1, the second isolation resistance R3, biasing resistor R2; One end of input protection capacitor C 1 links to each other by the copper film of via hole with the pcb board end face, and the other end links to each other with the in-phase input end of operational amplifier A 1; The outfan of operational amplifier A 1 links to each other with its inverting input; The end of the first isolation resistance R1 links to each other with the copper film of pcb board bottom surface, and the other end links to each other with the outfan of operational amplifier A 1; The end of capacitance C2 links to each other with the outfan of operational amplifier A 1, and the other end links to each other with the in-phase input end of operational amplifier A 2; The outfan of operational amplifier A 2 links to each other with its inverting input; The end of biasing resistor R2 links to each other other end ground connection with the in-phase input end of operational amplifier A 2; The end of the second isolation resistance R3 links to each other with the outfan of operational amplifier A 2, and the other end is signal output part.
The present invention adopts two-sided pcb board as signal detecting part, and is simple in structure, with low cost; Adopt spring as buffer unit, effectively suppressed the motion artifacts that the body kinematics of measurand causes in the signal detection process; Adopt metallic plate as support component in addition, not only can provide a supporting role, also provide electromagnetic shielding action for signal detecting part.
Description of drawings
Fig. 1 is that contactless electrocardio detects sketch map;
Fig. 2 is the structure chart of one embodiment of the invention;
The two-dimentional longitudinal plane structure figure of the two-sided pcb board that Fig. 3 adopts for embodiment;
The top surface structure figure of the two-sided pcb board that Fig. 4 adopts for embodiment;
The bottom surface structure chart of the two-sided pcb board that Fig. 5 adopts for embodiment;
The circuit structure diagram of the voltage buffer circuit that Fig. 6 adopts for embodiment;
Fig. 7 is applied to the sketch map of driver's cardioelectric monitor for the present invention.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 2, be the structure chart of one embodiment of the invention, comprise support component 4, signal detecting part 5 and buffering parts, buffer unit is made of spring 6, spring 7, spring 8 and spring 9.
Support component 4 adopts aluminum plate, and it is sized to 15
12cm, thickness is chosen as 0.2cm.Aluminum plate is used to provide supporting role, provides electromagnetic shielding action for signal detecting part simultaneously.
Signal detecting part 5 is made of the two-sided pcb board that has voltage buffer circuit, and its two-dimentional longitudinal plane structure figure as shown in Figure 3.The pcb board that present embodiment adopts be sized to 15
12cm, thickness is chosen as 0.3cm.As shown in Figure 4, the top surface structure figure of the pcb board that adopts for present embodiment; The end face of pcb board covers the copper film 10 of one deck center hollow out, and copper film thickness is chosen as 50
M, hollow out 11 be sized to 3
3cm; Cover one deck welding resistance printing ink 12 on the copper film, ink thickness is chosen as 10
M.As shown in Figure 5, the bottom surface structure chart of the pcb board that adopts for present embodiment; The bottom surface of pcb board covers the copper film 13 of one deck center hollow out, and copper film thickness is chosen as 50
M, hollow out 14 be sized to 3
3cm; Cover one deck welding resistance printing ink on the copper film, ink thickness is chosen as 10
M.The end face copper film of pcb board is electrode surface, for detection of the electrocardiosignal of measurand; The bottom surface copper film of pcb board is ground plane, is used for the interference that shielding external environment noise counter electrode face produces.Voltage buffer circuit 16 is arranged on the hollow out place of pcb board bottom surface copper film, Fig. 6 is the circuit structure diagram of the voltage buffer circuit of present embodiment employing, chip used is CMOS type double operational precision amplifier LMP7708, comprises operational amplifier LMP7708A, operational amplifier LMP7708B, input protection capacitor C 1, capacitance C2, the first isolation resistance R1, the second isolation resistance R3, biasing resistor R2; One end of input protection capacitor C 1 links to each other with the copper film 10 of pcb board end face by via hole 17, and the other end links to each other with the in-phase input end of operational amplifier LMP7708A; The outfan of operational amplifier LMP7708A links to each other with its inverting input; The end of the first isolation resistance R1 links to each other with the copper film 13 of pcb board bottom surface, and the other end links to each other with the outfan of operational amplifier LMP7708A; The end of capacitance C2 links to each other with the outfan of operational amplifier LMP7708A, and the other end links to each other with the in-phase input end of operational amplifier LMP7708B; The outfan of operational amplifier LMP7708B links to each other with its inverting input; The end of biasing resistor R2 links to each other other end ground connection with the in-phase input end of operational amplifier LMP7708B; The end of the second isolation resistance R3 links to each other with the outfan of operational amplifier LMP7708B, and the other end is signal output part.The outfan of operational amplifier LMP7702A links to each other with the bottom surface copper film of pcb board, makes its magnitude of voltage follow the magnitude of voltage of pcb board end face copper film, forms active shielding, thereby effectively suppresses the interference of external environmental noise counter electrode face; Adopt aluminum plate as support component in addition, further strengthened shielding action.Capacitance C2, biasing resistor R2, operational amplifier LMP7708B constitute active high-pass filter, and it is 0.05Hz by frequency that present embodiment is selected filtering.Described pcb board takes the bottom surface downward, and the end face modes of emplacement that makes progress makes its bottom surface towards support component, and end face is towards the health of measurand.
In the present embodiment, spring 6, spring 7, spring 8 and spring 9 all adopt compression-type, the heavy spring of heavy burden, and concrete specification is: external diameter: 1.6cm; Internal diameter: 0.8cm; Freely long: 2.5cm; Coefficient of elasticity: 125.8N/mm; Decrement: 0.6cm; Loading: 755N.One end of spring 6 is fixed on the lower left corner of support component, and the other end is fixed on the lower left corner of pcb board bottom surface; One end of spring 7 is fixed on the lower right corner of support component, and the other end is fixed on the lower right corner of pcb board bottom surface; One end of spring 8 is fixed on the upper right corner of support component, and the other end is fixed on the upper right corner of pcb board bottom surface; One end of spring 9 is fixed on the upper left corner of support component, and the other end is fixed on the upper left corner of pcb board bottom surface.
As shown in Figure 7, the capacitance electrode 18 that the present invention realizes is placed on the driver's seat, as signal electrode, its support component down, signal detecting part is up; A common metal electrode is installed in the left half-turn outer of vehicle steering, links to each other with ground in the circuit, is used for the health ground connection with the driver.The driver wears common clothes normal driving, the ground electrode on its left hand contact steering wheel, and electrocardiosignal is coupled to the input of follow-up signal treatment circuit by the capacitance electrode on the driver's seat.Because the capacitance electrode that adopted buffer unit, the present invention to realize can effectively suppress the motion artifacts that produces in the driving procedure.
Claims (8)
1. capacitance electrode for detection of driver's electrocardiosignal, it is characterized in that: be made of support component, signal detecting part and buffering parts, described support component links to each other by buffer unit with signal detecting part.
2. the capacitance electrode for detection of driver's electrocardiosignal according to claim 1, it is characterized in that: described support component is made of metallic plate.
3. the capacitance electrode for detection of driver's electrocardiosignal according to claim 1, it is characterized in that: described signal detecting part is made of two-sided pcb board, and two-sided pcb board is provided with voltage buffer circuit.
4. the capacitance electrode for detection of driver's electrocardiosignal according to claim 1, it is characterized in that: described buffer unit is made of spring.
5. the capacitance electrode for detection of driver's electrocardiosignal according to claim 3 is characterized in that: the copper film of end face covering one deck center hollow out of described two-sided pcb board, covering welding resistance printing ink on the copper film.
6. the capacitance electrode for detection of driver's electrocardiosignal according to claim 3 is characterized in that: the copper film of covering one deck center, bottom surface hollow out of described two-sided pcb board, covering welding resistance printing ink on the copper film.
7. according to claim 3 or 5 or 6 described capacitance electrodes for detection of driver's electrocardiosignal, it is characterized in that: the shape of the end face copper film of described two-sided pcb board is identical with the shape of bottom surface copper film.
8. the capacitance electrode for detection of driver's electrocardiosignal according to claim 3, it is characterized in that: described voltage buffer circuit is arranged on the hollow out place of pcb board bottom surface copper film, comprises operational amplifier A 1, operational amplifier A 2, input protection capacitor C 1, capacitance C2, the first isolation resistance R1, the second isolation resistance R3, biasing resistor R2; One end of input protection capacitor C 1 links to each other by the copper film of via hole with the pcb board end face, and the other end links to each other with the in-phase input end of operational amplifier A 1; The outfan of operational amplifier A 1 links to each other with its inverting input; The end of the first isolation resistance R1 links to each other with the copper film of pcb board bottom surface, and the other end links to each other with the outfan of operational amplifier A 1; The end of capacitance C2 links to each other with the outfan of operational amplifier A 1, and the other end links to each other with the in-phase input end of operational amplifier A 2; The outfan of operational amplifier A 2 links to each other with its inverting input; The end of biasing resistor R2 links to each other other end ground connection with the in-phase input end of operational amplifier A 2; The end of the second isolation resistance R3 links to each other with the outfan of operational amplifier A 2, and the other end is signal output part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310179299.7A CN103230270B (en) | 2013-05-15 | 2013-05-15 | A kind of capacitance electrode for detecting driver's electrocardiosignal |
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| CN201310179299.7A CN103230270B (en) | 2013-05-15 | 2013-05-15 | A kind of capacitance electrode for detecting driver's electrocardiosignal |
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| CN103230270A true CN103230270A (en) | 2013-08-07 |
| CN103230270B CN103230270B (en) | 2016-03-30 |
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| CN201310179299.7A Expired - Fee Related CN103230270B (en) | 2013-05-15 | 2013-05-15 | A kind of capacitance electrode for detecting driver's electrocardiosignal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104414634A (en) * | 2013-08-22 | 2015-03-18 | 福特全球技术公司 | Sensor for contactless electrocardiographic measurement, sensor array and seat or bunk |
| WO2015160272A1 (en) | 2014-04-14 | 2015-10-22 | Novelic D.O.O. | Mm-wave radar driver fatigue sensor apparatus |
| CN105615880A (en) * | 2015-11-27 | 2016-06-01 | 电子科技大学 | Flexible graphene electroencephalogram capacitive electrode capable of inhibiting motion artifacts |
| CN107788968A (en) * | 2017-03-07 | 2018-03-13 | 中南大学 | A kind of contactless multi-lead electrocardiogram monitor system based on array type capacity electrode |
| CN110267592A (en) * | 2016-12-21 | 2019-09-20 | 通用电气公司 | ECG sensor with the protection of capacitor defibrillation |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104414634A (en) * | 2013-08-22 | 2015-03-18 | 福特全球技术公司 | Sensor for contactless electrocardiographic measurement, sensor array and seat or bunk |
| WO2015160272A1 (en) | 2014-04-14 | 2015-10-22 | Novelic D.O.O. | Mm-wave radar driver fatigue sensor apparatus |
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| DE112015001807B4 (en) | 2014-04-14 | 2019-04-18 | NovellC d.o.o. | MM Wave Driver Fatigue Detection Device and Operation |
| CN105615880A (en) * | 2015-11-27 | 2016-06-01 | 电子科技大学 | Flexible graphene electroencephalogram capacitive electrode capable of inhibiting motion artifacts |
| CN110267592A (en) * | 2016-12-21 | 2019-09-20 | 通用电气公司 | ECG sensor with the protection of capacitor defibrillation |
| CN110267592B (en) * | 2016-12-21 | 2022-02-11 | 通用电气公司 | ECG sensor with capacitive defibrillation protection |
| CN107788968A (en) * | 2017-03-07 | 2018-03-13 | 中南大学 | A kind of contactless multi-lead electrocardiogram monitor system based on array type capacity electrode |
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