CN103799999A - Wireless pulse meter device based on piezoelectric buzzer - Google Patents
Wireless pulse meter device based on piezoelectric buzzer Download PDFInfo
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- CN103799999A CN103799999A CN201210559749.0A CN201210559749A CN103799999A CN 103799999 A CN103799999 A CN 103799999A CN 201210559749 A CN201210559749 A CN 201210559749A CN 103799999 A CN103799999 A CN 103799999A
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Abstract
The invention discloses a wireless pulse meter device based on a piezoelectric buzzer. The wireless pulse meter device comprises the piezoelectric buzzer for measuring pulse, a signal conditioning circuit, a balloon, a pressure sensor for measuring balloon pressure, a master control data acquisition chip, a signal transmitting antenna, a data receiving chip, a receiving-end power supply and a signal receiving antenna, wherein the master control data acquisition chip is connected with the data receiving chip through a wireless network; the master control data acquisition chip acquires an output signal of the piezoelectric buzzer through the signal conditioning circuit; the master control data acquisition chip controls the balloon to generate required rated pressure; the master control data acquisition chip acquires an output signal of the pressure sensor; the data receiving chip receives a pulse signal transmitted by the master control data acquisition chip through a ZigBee network; and the signal transmitting antenna and the signal receiving antenna form a hardware interface for wireless network communication. The wireless pulse meter device based on the piezoelectric buzzer can measure the pulse signal rapidly and accurately and perform wireless transmission and reception.
Description
Technical field
The present invention relates to a kind of wireless pulse meter device based on piezoelectricity singing piece, be mainly used in sports heart rate statistics, the old man of community pulse monitoring and other medicine and hygiene fields.
Background technology
Flourish along with medical industry, the traditional Chinese medical science is widely used in worldwide, and the measurement of pulse signal has great application prospect in tcm clinical practice diagnosis, and the electronic sphygmograph of for this reason developing a low-cost and high-precision has a very big significance.Conventionally at present, the sensing element of electronic sphygmograph is divided into two classes, and a class is electro-optical pickoff, and another kind of is piezoelectric transducer.Conventionally the selected material of piezoelectric transducer is PVDF piezoelectric membrane, and this material is conventionally very expensive, and its output signal need to be equipped with sophisticated signal modulate circuit simultaneously, is unfavorable for the application of product.For this reason, find the simple sensing element that substitutes of a kind of low cost and exploitation to be extremely necessary, the wireless pulses measure instrument apparatus based on piezoelectric ceramics buzzing sheet just in time meets this requirement, can also carry out remote wireless transmission simultaneously.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is to provide a kind of wireless pulse meter device based on piezoelectricity singing piece, and it can measure pulse signal quickly and accurately, and carries out wireless transmission and reception.
(2) technical scheme
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
Based on a wireless pulse meter device for piezoelectricity singing piece, comprise piezoelectricity singing piece, signal conditioning circuit, air bag, the pressure transducer of the described gasbag pressure of measurement, major control data acquisition chip, signal transmitting antenna, data receiver chip, receiving terminal power supply, signal receiving antenna for measuring pulse; Described major control data acquisition chip is connected by wireless network with data receiver chip; Described major control data acquisition chip gathers the output signal of described piezoelectricity singing piece by described signal conditioning circuit; Described in the control of described major control data acquisition chip, air bag produces the rated pressure needing; Described major control data acquisition chip gathers the output signal of described pressure transducer; Described data receiver chip receives the pulse signal of described major control data acquisition chip transmission by ZigBee-network; Described major control data acquisition chip connects described signal transmitting antenna, and described data receiver chip connects described signal receiving antenna, and described signal transmitting antenna and signal receiving antenna form the hardware interface of described wireless communication.
Wherein, between described major control data acquisition chip and air bag, be also provided with micro air pump, the pressure that described micro air pump is produced described air bag by the control of described major control data acquisition chip is finely tuned.
Wherein, described major control data acquisition chip is also connected with LCD display and button, the systematic parameter of major control data acquisition chip described in described button operation, the pulse wave of the real-time display measurement of described LCD display and beat pulse frequency.
Wherein, described major control data acquisition chip is CC2530 major control data acquisition chip, and described data receiver chip is CC2530 data receiver chip.
Wherein, described signal conditioning circuit carries out after filtering, amplification, secondary filtering and secondary amplification the output signal of described piezoelectricity singing piece, be converted into the voltage signal changing within the scope of 0-3.3V, the voltage signal of output is by AD (AIN0～AIN7) the sampling pin sampling of described CC2530 major control data acquisition chip.
Wherein, described CC2530 data receiver chip is connected with display lamp and serial ports, and described indicating light sign shows transmission status, and described serial ports is connected to host computer and transmits data.
Wherein, described piezoelectricity singing piece is two electrode type vicarious circular piezoelectric buzzing sheets, comprise the internal layer of being made by piezoceramic material and the skin of being made by metal material, when beat pulse, can push piezoelectricity singing piece, and will produce the Voltage-output of 0.01～0.015V at its two electrode.
Wherein, described CC2530 data receiver chip connects the receiving terminal power supply of promising its power supply.
Wherein, described CC2530 data receiver chip is also connected with receiving terminal switch.
(3) beneficial effect
The present invention is compared to prior art, has following beneficial effect: the present invention, in order to reduce interfering signal, extracts useful signal, adopts different filtering and interference protection measure for different interference, can be good at eliminating noise; Piezoelectric ceramics buzzing sheet is a pressure sensor component cheaply, after the hardware and software Filtering Processing to its output signal, output signal can meet the needs of actual measurement, therefore it is feasible utilizing piezoelectric ceramics buzzing sheet to measure the carrying out of pulse signal, add ZigBee wireless transmission, making has good commercial application prospect based on the wireless pulse meter device of piezoelectricity singing piece.
Accompanying drawing explanation
Fig. 1 is the hardware block diagram of the embodiment of the present invention.
Fig. 2 is the schematic diagram of the main measurement component of the embodiment of the present invention.
Fig. 3 is the hardware connection layout of the signal conditioning circuit of the embodiment of the present invention.
Fig. 4 is the circuit block diagram of the signal conditioning circuit of the embodiment of the present invention.
Fig. 5 a is the measured waveform one of the pulse signal of the embodiment of the present invention.
Fig. 5 b is the measured waveform two of the pulse signal of the embodiment of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, based on a wireless pulse meter device for piezoelectricity singing piece, comprise piezoelectricity singing piece, signal conditioning circuit, air bag, the pressure transducer of the described gasbag pressure of measurement, major control data acquisition chip, signal transmitting antenna, data receiver chip, receiving terminal power supply, signal receiving antenna for measuring pulse; Described major control data acquisition chip is connected by wireless network with data receiver chip; Described major control data acquisition chip gathers the output signal of described piezoelectricity singing piece by described signal conditioning circuit; Described in the control of described major control data acquisition chip, air bag produces the rated pressure needing; Described major control data acquisition chip gathers the output signal of described pressure transducer; Described data receiver chip receives the pulse signal of described major control data acquisition chip transmission by ZigBee-network; Described major control data acquisition chip connects described signal transmitting antenna, and described data receiver chip connects described signal receiving antenna, and described signal transmitting antenna and signal receiving antenna form the hardware interface of described wireless communication.
Between described major control data acquisition chip and air bag, be also provided with micro air pump, the pressure that described micro air pump is produced described air bag by the control of described major control data acquisition chip is finely tuned.In the time that pressure is excessive, micro air pump will be exitted, and when pressure is too small, micro air pump will be given airbag aeration.
Described major control data acquisition chip is also connected with LCD display and button, the systematic parameter of major control data acquisition chip described in described button operation, the pulse wave of the real-time display measurement of described LCD display and beat pulse frequency.
Described major control data acquisition chip is CC2530 major control data acquisition chip, and described data receiver chip is CC2530 data receiver chip.
As shown in Figure 1, Figure 3 and Figure 4, described signal conditioning circuit carries out after filtering, amplification, secondary filtering and secondary amplification the output signal of described piezoelectricity singing piece, be converted into the voltage signal changing within the scope of 0-3.3V, the voltage signal of output is by AD (AIN0～AIN7) the sampling pin sampling of described CC2530 major control data acquisition chip.Here the AIN0 of the CC2530 selecting is as the input of AD sampling, analogue signal during due to sampling exists unstability of base line and other interference, CC2530 major control data acquisition chip need make further date processing to the data after sampling, data through Digital Signal Processing finally will be passed to CC2530 data receiver chip by ZigBee wireless network, and CC2530 data receiver chip can be passed to computer or other upper computer software by serial ports.
Described CC2530 data receiver chip is connected with display lamp and serial ports, and described indicating light sign shows transmission status, and in the time having transfer of data, display lamp will constantly glimmer, and described serial ports is connected to host computer and transmits data.
As shown in Figure 2, described piezoelectricity singing piece is two electrode type vicarious circular piezoelectric buzzing sheets, comprise the internal layer of being made by piezoceramic material and the skin of being made by metal material, when beat pulse, can push piezoelectricity singing piece, and will produce the Voltage-output of 0.01～0.015V at its two electrode.When piezoelectric ceramics buzzing sheet is applied in DC voltage, produces alternately repeated mechanical bend distortion, thereby in air, produce sound wave, be often used as microphone device; But piezoelectric ceramic piece is under the effect of external force, also can produce electric wave, and mechanical energy is converted into the signal of telecommunication, now just piezoelectric ceramics buzzing sheet can be used as to a kind of sensor and uses.As sensor its have highly sensitive, good reliability, the feature such as the life-span is long, and thin thickness is lightweight, and volume is little.Measure faint pulse signal in order to meet, through lot of experiment validation, select two electrode type vicarious circular piezoelectric buzzing sheets can better meet measurement requirement, this is wireless, and pulse transducer measurement critical piece buzzing sheet is made up of lead zirconate titanate or lead magnesio-niobate piezoceramic material.Two sides at potsherd plates silver electrode, after polarization and burin-in process, then sticks together with latten(-tin) or stainless steel substrates.Conventionally with finger extruding piezoelectricity singing piece, will produce the Voltage-output of 0.01～0.015V at its two electrode, in the situation that pressure is identical, the voltage value of buzzing sheet output is higher, and its sensitivity is also just higher.
The present invention is directed to piezoelectric ceramics buzzing sheet and designed signal conditioning circuit, the mechanical signal of beat pulse is converted into the signal of telecommunication through piezoelectric ceramics buzzing sheet, after amplifying circuit of differential type amplifies, be admitted in the wave trap of a 50Hz, after filtering power frequency interference signals, signal is again through a band pass filter circuit, and further other interfering signal of filtering, finally by within crossing a secondary amplifying circuit signal is amplified to the sampling voltage scope of AD converter and output.Piezoelectric ceramics buzzing sheet is in measuring beat pulse such small-signal, and its output voltage generally below 15mV, considers that the noise of various frequencies, on the impact of sensor output signal, taked different filterings and braking measure.Should select 0.1% high-precision metal membrane resistance for using resistance in trap circuit and time constant circuit, electric capacity should select tantalum electric capacity to make building-out capacitor.Should take the measure of hardware notch filter to 50Hz industrial frequency noise, experiment showed, that the method is better to the inhibition of power frequency interference signals; Electromagnetic signal is suppressed to take holding wire to shield and design the method such as 2 rank low pass filters that cut-off frequency is 40Hz.Although it is constant that people's body temperature keeps substantially, the temperature of wrist position skin surface is subject to impact that ambient temperature changes still very greatly, and the temperature difference of wrist position skin and sensor surface also can bring very large impact to measurement, in order to eliminate temperature effects noise.Can utilize between human pulse (1Hz left and right) and thermoelectricity noise signal (0.5Hz is following) and have frequency difference, design a high-pass digital filter that lower frequency limit is 0.5Hz, the harmful effect of having avoided temperature effects to bring to pulses measure.
Described CC2530 data receiver chip connects the receiving terminal power supply of promising its power supply.
Described CC2530 data receiver chip is also connected with receiving terminal switch.
As shown in Fig. 5 a and Fig. 5 b, what baseline correction method of the present invention adopted is a kind of non-linear low pass filter that can fine inhibit signal local edge.The key of the baseline correction method based on medium filtering is the selection of filtering window width.If window selects narrowly, useful wave may be by filtering, and, along with the part that reduces wave filter filtering of window width just increases, the information of loss has also increased with regard to corresponding; If select widely, the window treatment effect that not only do not have clear improvement, and increased operand, and even also likely do not reach treatment effect, do not reach the object that suppresses baseline drift.The sample frequency of selecting due to CC2530 chip is 100Hz, and the width of the window of known median filtering algorithm should be (80～90) Hz, and window width is 85.Wdata[170] be the pulse original data storage array gathering, mdata[85] be the storage array of the intermediate value after calculating, new_data is the storages of last samples data, the current deal with data index of i, f_pos is the index position of a legacy data will deleting in sequence array tmp_data after a new data is collected.Program can be revised data and upgrade demonstration one secondary data after 85 data of every sampling.In order to realize the quicksort to the wdata after new interpolation data, tmp_wdata sequence processing subprogram has realized the ranking function of wdata sequence.Fig. 5 a, for not using the measured pulse wave of median filtering algorithm, can find out that from Fig. 5 a the baseline of output waveform exists fluctuation.Fig. 5 b adopts median filtering algorithm pulse wave afterwards, can find out that pulse baseline is substantially on same axis.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the wireless pulse meter device based on piezoelectricity singing piece, is characterized in that: comprise piezoelectricity singing piece, signal conditioning circuit, air bag, the pressure transducer of the described gasbag pressure of measurement, major control data acquisition chip, signal transmitting antenna, data receiver chip, receiving terminal power supply, signal receiving antenna for measuring pulse; Described major control data acquisition chip is connected by wireless network with data receiver chip; Described major control data acquisition chip gathers the output signal of described piezoelectricity singing piece by described signal conditioning circuit; Described in the control of described major control data acquisition chip, air bag produces the rated pressure needing; Described major control data acquisition chip gathers the output signal of described pressure transducer; Described data receiver chip receives the pulse signal of described major control data acquisition chip transmission by ZigBee-network; Described major control data acquisition chip connects described signal transmitting antenna, and described data receiver chip connects described signal receiving antenna, and described signal transmitting antenna and signal receiving antenna form the hardware interface of described wireless communication.
2. the wireless pulse meter device based on piezoelectricity singing piece according to claim 1, it is characterized in that: between described major control data acquisition chip and air bag, be also provided with micro air pump, the pressure that described micro air pump is produced described air bag by the control of described major control data acquisition chip is finely tuned.
3. the wireless pulse meter device based on piezoelectricity singing piece according to claim 2, it is characterized in that: described major control data acquisition chip is also connected with LCD display and button, the systematic parameter of major control data acquisition chip described in described button operation, the pulse wave of the real-time display measurement of described LCD display and beat pulse frequency.
4. the wireless pulse meter device based on piezoelectricity singing piece according to claim 3, is characterized in that: described major control data acquisition chip is CC2530 major control data acquisition chip, described data receiver chip is CC2530 data receiver chip.
5. the wireless pulse meter device based on piezoelectricity singing piece according to claim 4, it is characterized in that: described signal conditioning circuit carries out after filtering, amplification, secondary filtering and secondary amplification the output signal of described piezoelectricity singing piece, be converted into the voltage signal changing within the scope of 0-3.3V, the voltage signal of output is sampled by the AD sampling pin of described CC2530 major control data acquisition chip.
6. the wireless pulse meter device based on piezoelectricity singing piece according to claim 5, it is characterized in that: described CC2530 data receiver chip is connected with display lamp and serial ports, described indicating light sign shows transmission status, and described serial ports is connected to host computer and transmits data.
7. the wireless pulse meter device based on piezoelectricity singing piece according to claim 6, it is characterized in that: described piezoelectricity singing piece is two electrode type vicarious circular piezoelectric buzzing sheets, comprise the internal layer of being made by piezoceramic material and the skin of being made by metal material, when beat pulse, piezoelectricity singing piece can be pushed, and the Voltage-output of 0.01～0.015V will be produced at its two electrode.
8. the wireless pulse meter device based on piezoelectricity singing piece according to claim 7, is characterized in that: described CC2530 data receiver chip connects the receiving terminal power supply of promising its power supply.
9. the wireless pulse meter device based on piezoelectricity singing piece according to claim 8, is characterized in that: described CC2530 data receiver chip is also connected with receiving terminal switch.
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| CN201210559749.0A CN103799999A (en) | 2012-12-21 | 2012-12-21 | Wireless pulse meter device based on piezoelectric buzzer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019010615A1 (en) * | 2017-07-10 | 2019-01-17 | 中国科学院微电子研究所 | Pulse wave sensor, sensor array and pulse wave measurement method |
| CN111134716A (en) * | 2020-01-03 | 2020-05-12 | 绵阳市中医医院 | Bowel sound collection system |
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Patent Citations (7)
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| GB2434509A (en) * | 2006-01-18 | 2007-07-25 | Seiko Instr Inc | Biometric information transmitter |
| CN101006918A (en) * | 2007-01-05 | 2007-08-01 | 哈尔滨工业大学 | Integrated test-equipment of blood pressure, pulse and electrocardiograms |
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| WO2019010615A1 (en) * | 2017-07-10 | 2019-01-17 | 中国科学院微电子研究所 | Pulse wave sensor, sensor array and pulse wave measurement method |
| CN111134716A (en) * | 2020-01-03 | 2020-05-12 | 绵阳市中医医院 | Bowel sound collection system |
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Application publication date: 20140521 |