CN205338939U - Pulse measurement appearance based on infrared photoelectric sensor - Google Patents
Pulse measurement appearance based on infrared photoelectric sensor Download PDFInfo
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- CN205338939U CN205338939U CN201521046372.4U CN201521046372U CN205338939U CN 205338939 U CN205338939 U CN 205338939U CN 201521046372 U CN201521046372 U CN 201521046372U CN 205338939 U CN205338939 U CN 205338939U
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Abstract
The utility model provides a pulse measurement appearance based on infrared photoelectric sensor, includes the signal acquisition circuit who is used for converting the infrared light that the pulse that detects is beated to the signal of telecommunication, and with signal amplification and the shaping circuit that signal acquisition circuit links to each other, the signal amplification is connected with the singlechip with shaping circuit, and the singlechip is connected with liquid crystal display module. The utility model discloses a setting up signal acquisition circuit, gathering the signal, the signal amplification and the shaping circuit that link to each other with signal acquisition circuit carry out enlargeing and plastic processing of signal, will through again enlargeing with plastic processing after signal transmission give the singlechip, at last with the result at the enterprising line display of liquid crystal display module, the utility model has the characteristics of on the basis of realizing the measuring accuracy, has the simple and convenient more and low cost of operation process. The utility model discloses simple structure uses and enlargies interference and the error that reaches shaping circuit and reduce the collection signal to realize the accuracy of result.
Description
Technical field
This utility model relates to a kind of electronic sphygmograph, is specifically related to a kind of electronic sphygmograph based on infrared photoelectric sensor.
Background technology
Along with the development of science and technology, heart rate measurement technology is also increasingly advanced, and the certainty of measurement of heart rate is also more and more higher, have developed both at home and abroad successively different types of cardiotachometer, and wherein it is crucial that research to heart rate sensor.Originally concentrate on the research to touch sensor for the heart rate test of gym survey, utilize the measuring instruments such as finger arteries and veins, ear arteries and veins that sensors with auxiliary electrode develops to be respectively arranged with its pluses and minuses.Referring to that arteries and veins is measured more convenient, simple, but because the sweat gland on finger is more, refer to press from both sides long-term use, pollution may make measurement sensitivity decline: ear arteries and veins is measured relatively cleaner, and sensor uses low in the pollution of the environment, it is easy to safeguard.But because ear arteries and veins is more weak, especially when seasonal variations, measured signal is influenced by ambient temperature substantially, causes measurement result inaccurate.
The daily monitor occurred in hospital clinical monitoring and daily health care for the middle and old aged at present, such as Portable Electronic Blood Pressure Monitor, although the measurement of heart rate can be completed, but this Portable Electronic Blood Pressure Monitor utilizes micro air pump pressurized rubber air bag, measure the process being required for a pressurization and decompression every time, exist bulky, add decompression process and have the shortcomings such as degree of accuracy is low of discomfort, heart rate detection.
Concrete, in currently available technology, the shortcoming existed mainly have following some:
(1), when application TCRT5000 infrared photoelectric sensor detects signal, the position of pipe blue in TCRT5000 and clarinet be there are certain requirements.And obtained signal need to carry out two-stage amplifying circuit when amplifying, and adds the complexity of circuit and error.
(2) existing measurement human pulse technology, mostly adopts the peripheral circuit of relative complex, faint pulse signal is amplified and shaping, the even multistage amplification having, and is more the increase in the complexity of circuit.And when adopting pressure transducer, it is necessary to add pressue device, for instance inflator pump and the fixing air valve of connection, gas storage cuff, add cost and the difficulty of whole device undoubtedly.
(3) traditional finger arteries and veins measurement is easier to contaminated, and sensitivity is measured in impact；Ear arteries and veins is measured easy temperature influence and is caused bigger error；The shortcomings such as conventional Portable Electronic Blood Pressure Monitor has bulky, measurement result inaccuracy.
Utility model content
For overcoming the problems of the prior art, the purpose of this utility model is in that to provide a kind of electronic sphygmograph based on infrared photoelectric sensor, realizing on the basis of accuracy of measurement, has the advantages that operating process is easier and with low cost.
For achieving the above object, this utility model adopts the following technical scheme that:
A kind of electronic sphygmograph based on infrared photoelectric sensor, including the signal acquisition circuit for the infrared light of the beat pulse of detection being converted to the signal of telecommunication, the signal being connected with signal acquisition circuit amplifies and shaping circuit, signal amplifies and shaping circuit is connected to single-chip microcomputer, and single-chip microcomputer is connected to LCD MODULE.
Described signal acquisition circuit includes power supply VCC, infrared light emitting diode D2, light sensitive diode D3, resistance R7, resistance R8, resistance R9 and electric capacity C8, one end of wherein said resistance R7 connects power supply VCC, the other end of resistance R7 is connected with the positive pole of infrared light emitting diode D2, the minus earth of infrared light emitting diode D2；One end of resistance R8 is connected with power supply VCC, and the other end of resistance R8 is connected with one end of electric capacity C8 and the negative pole of light sensitive diode D3, the plus earth of light sensitive diode D3；The other end of electric capacity C8 is connected with shaping circuit with one end of resistance R9 and signal amplification respectively, the other end ground connection of resistance R9.
Described signal amplifies and shaping circuit includes double, two integrated transporting discharging LM358, electric capacity C6, electric capacity C7, slide rheostat R6, resistance R5, resistance R4, slide rheostat R3, and the signal of telecommunication of light sensitive diode D3 output is connected with 5 pins of LM358, 6 pins of LM358 are connected with slide rheostat R6, and one end ground connection of slide rheostat R6, the other end is connected respectively at one end of one end of electric capacity C6 and resistance R5, the other end of electric capacity C6 and the other end of resistance R5 are connected with 7 pins of LM358 respectively, 7 pins of LM358 are also connected with one end of electric capacity C7, the other end of electric capacity C7 is connected with 3 pins of LM358, 2 pins of LM358 are connected with slide rheostat R3, one end of slide rheostat R3 is through resistance R4 ground connection, the other end connects power supply VCC；1 pin of LM358 is connected with single-chip microcomputer.
Described single-chip microcomputer is 89C51 single-chip microcomputer.
Described LCD MODULE is LCD1602 LCDs.
Compared with prior art, this utility model has the advantages that
This utility model is by being arranged to convert the infrared light of the beat pulse of detection to the signal acquisition circuit of the signal of telecommunication, it is acquired signal, the signal amplification and the shaping circuit that are connected with signal acquisition circuit carry out amplification and the Shape correction of signal, again the signal after amplification with Shape correction is sent to single-chip microcomputer, finally result is displayed in LCD MODULE, this utility model has realizing on the basis of accuracy of measurement, has the advantages that operating process is easier and with low cost.This utility model simple in construction, application is amplified and shaping circuit reduces the interference and error that gather signal, to realize the accuracy of result.
Further, during measurement, it is only necessary to place a digit in the middle of the infrared light emitting diode D2 in signal acquisition circuit and light sensitive diode D3, owing in finger, the concentration of blood can change along with the change of heart beating, intercept the phenomenon of infrared receiver when will appear from.Due to light sensitive diode D3 reversal connection, light sensitive diode D3 is constantly in reverse breakdown state, and now the experienced infra-red intensity of light sensitive diode D3 is constant and both sides have a stable voltage.If the infra-red intensity that light sensitive diode D3 accepts on this basis changes, the voltage of its both sides can produce trickle fluctuation along with the change of infra-red intensity, it is then passed through electric capacity C8 and resistance R9 elimination direct current, collects the peak value raw voltage signals at about 50mV.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is signal acquisition circuit of the present utility model.
Fig. 3 is that signal amplifies and shaping circuit.
Wherein, 1 is signal acquisition circuit, and 2 amplify and shaping circuit for signal, and 3 is single-chip microcomputer, and 4 is LCD MODULE.
Detailed description of the invention
Below in conjunction with accompanying drawing, this utility model is described in detail.
Referring to Fig. 1, this utility model includes pulse transducer 5, be connected with pulse transducer 5 and the infrared light of beat pulse for being detected by pulse transducer converts the signal acquisition circuit 1 of the signal of telecommunication to, the signal being connected with signal acquisition circuit amplifies and shaping circuit 2, signal amplifies and shaping circuit 2 is connected to single-chip microcomputer 3, and single-chip microcomputer 3 is connected to LCD MODULE 4.
Referring to Fig. 2, described signal acquisition circuit includes power supply VCC, infrared light emitting diode D2, light sensitive diode D3, resistance R7, resistance R8, resistance R9 and electric capacity C8, one end of wherein said resistance R7 connects power supply VCC, the other end of resistance R7 is connected with the positive pole of infrared light emitting diode D2, the minus earth of infrared light emitting diode D2；One end of resistance R8 is connected with power supply VCC, and the other end of resistance R8 is connected with one end of electric capacity C8 and the negative pole of light sensitive diode D3, the plus earth of light sensitive diode D3；The other end of electric capacity C8 is connected with shaping circuit 2 with one end of resistance R9 and signal amplification respectively, the other end ground connection of resistance R9.
Referring to Fig. 3, described signal amplifies and shaping circuit includes double, two integrated transporting discharging LM358, electric capacity C6, electric capacity C7, slide rheostat R6, resistance R5, resistance R4, slide rheostat R3, and the signal of telecommunication of light sensitive diode D3 output is connected with 5 pins of LM358, 6 pins of LM358 are connected with slide rheostat R6, and one end ground connection of slide rheostat R6, the other end is connected respectively at one end of one end of electric capacity C6 and resistance R5, the other end of electric capacity C6 and the other end of resistance R5 are connected with 7 pins of LM358 respectively, 7 pins of LM358 are also connected with one end of electric capacity C7, the other end of electric capacity C7 is connected with 3 pins of LM358, 2 pins of LM358 are connected with slide rheostat R3, one end of slide rheostat R3 is through resistance R4 ground connection, the other end connects power supply VCC；1 pin of LM358 is connected with single-chip microcomputer 3；5 pins of LM358 are connected with electric capacity C8.
Single-chip microcomputer 3 described in this utility model is 89C51 single-chip microcomputer, and described LCD MODULE 4 is LCD1602 LCDs.
The electronic sphygmograph based on infrared photoelectric sensor of this utility model institute utility model is to utilize photoelectric sensor as conversion original paper, and the infrared light for detecting beat pulse collected is converted to the signal of telecommunication, with the device of electronic instrument measurement and display.It mainly includes the parts such as signals collecting and amplifying circuit, single-chip microcomputer, LCD MODULE.
Specifically described below:
1. photoelectric sensor
Photoelectric sensor is made up of infraluminescence diode and light sensitive diode D3.Adopting GaAs infrarede emitting diode as light source, light sensitive diode D3 can produce electric energy under the irradiation of infrared light, and its characteristic is to convert optical signals to the signal of telecommunication.
In this utility model, the light sensitive diode D3 directional property putting obtain the best relative to infrared-emitting diode.
2. signal acquisition circuit
Signal acquisition circuit is as shown in Figure 2.The infrared ray of continuous-stable is launched by infrared light emitting diode D2, by light sensitive diode D3 receiving infrared-ray, when placing a finger between infrared light emitting diode D2 and light sensitive diode D3, owing in finger, the concentration of blood can change along with the change of heart beating, when will appear from, intercept the phenomenon of infrared receiver.Due to light sensitive diode D3 reversal connection, light sensitive diode D3 is constantly in reverse breakdown state, and now the experienced infra-red intensity of light sensitive diode D3 is constant and both sides have a stable voltage.If the infra-red intensity that light sensitive diode D3 accepts on this basis changes, the voltage of its both sides can produce trickle fluctuation along with the change of infra-red intensity, it is then passed through electric capacity C8 and resistance R9 elimination direct current, collects the peak value raw voltage signals at about 50mV.
3. signal amplifies and shaping circuit
The signal of telecommunication owing to being exported by light sensitive diode D3 is very faint, not disposable, it is necessary to it is amplified.So, this utility model arranges signal amplification circuit, is amplified by the signal that signal acquisition circuit exports, makes a suitable signal of amplitude, it is simple to the amplification of subsequent conditioning circuit and shaping.
Utilizing double; two integrated transporting discharging LM358, this signal is given 5 pins of LM358, as it is shown on figure 3, wherein, amplification can be determined (amplification in this utility model is 100 times) by the resistance of R5, R6.
Owing to this pulse signal is simply close to sine wave, there is a certain amount of error ripple, utilize electric capacity C7, by these error signal eliminations so that it is closer to sine wave.
Followed by Shape correction.Now utilize the 2 of LM358,3 pins, composition is as shown in Figure 3.Wherein the magnitude of voltage of the 2 pin inputs of LM358 is adjustable reference voltage, and its big I is determined by the resistance of slide rheostat R3.Filtered signal and this reference voltage relatively after, just export high level at 1 pin more than reference voltage, less than reference voltage just in 1 pin output low level.Therefore, after this shaping circuit, original sine wave become the square wave output of easily counting.The square wave of output is re-fed into single-chip microcomputer 3.
4. single-chip microcomputer
This utility model adopts 89C51 single-chip microcomputer, monolithic function is used faster and more accurately data to be carried out computing, owing to there being two programmable 16 bit timing devices/enumerator T0 and T1 inside 51 single-chip microcomputers, they both can as intervalometer, again can as the enumerator of external event.At this, utilizing its tally function, the pulse signal received is counted, peripheral cell used is few, light and handy power saving, failure rate is low.
From the P3.2 pin of the impulse level input single-chip microcomputer amplified with shaping circuit, single-chip microcomputer is set to rising edge down trigger pattern, therefore triggers single-chip microcomputer when each rising edge of a pulse arrives and produce interrupt and carry out timing, carrys out a pulse frequency of pulse and just adds one；One rising edge of single-chip microcomputer identification square-wave signal, starts timing, and internal timer interrupts once until the rising edge of next square wave is come every 50ms, and timing stops.Now calculating the time between two square wave rising edges (timing time that the number of times * 50ms+ internal timer of internal interrupt is last) is the time used by a heart beating, this time is stored in array, continue to calculate the time needed for heart beating next time, treat array is stored in the time of the individual heartbeat of certain number of times, start to calculate meansigma methods.Now the value of heart rate is exactly the meansigma methods of 60s/ individual heartbeat, finally by P0, P1 mouth, result is delivered to LCD MODULE and displays.
5. LCD MODULE
Owing to LCD1602 liquid crystal display has the advantages such as display quality interface high, digital, volume are little, lightweight, low in energy consumption as output device, so LCD MODULE selects LCD1602 LCDs, pulse signal is shown.
When this utility model is measured: when placing a finger between infrared light emitting diode D2 and light sensitive diode D3, owing in finger, the concentration of blood can change along with the change of heart beating, intercept the phenomenon of infrared receiver when will appear from.Due to light sensitive diode D3 reversal connection, light sensitive diode D3 is constantly in reverse breakdown state, and now the experienced infra-red intensity of light sensitive diode D3 is constant and both sides have a stable voltage.If the infra-red intensity that light sensitive diode D3 accepts on this basis changes, the voltage of its both sides can produce trickle fluctuation along with the change of infra-red intensity, it is then passed through electric capacity C8 and resistance R9 elimination direct current, collects the peak value raw voltage signals at about 50mV.This signal amplifies through signal and after shaping circuit, is transported to single-chip microcomputer, after single-chip microcomputer counting, displays measurement result by LCD MODULE.
Electronic sphygmograph of the present utility model uses singlechip technology, and principle is simple, easy to use, only need to be put gently on a sensor by finger end, can demonstrate your frequency of pulse per minute in real time, is particularly suitable for the occasion such as athletic training and out on tours and uses.Compared with prior art, this utility model adopts a pair infrared-emitting diode and light sensitive diode D3 as the sensor gathering pulse signal, plus a series of subsequent process circuits, these circuit utility models are easy, it is easily achieved, the composition cost making whole electronic sphygmograph is low, and certainty of measurement is high, and substantially increases the convenience of measurement.
1., in signals collecting part, except infrarede emitting diode of the present utility model and light sensitive diode D3 serve as sensor, also can be selected for other sensor, such as pressure transducer etc..
2. signal processing, this utility model has mainly been selected LM358 that faint pulse signal is exaggerated, has been filtered and shaping.Herein can with the corresponding amplification of other chip composition, shaping circuit, such as can use four high guaily unit integrated circuit LM324 chip, high-precision single operational amplifier OP07 chip, or combine with resistance capacitance with CD4069, constitute low-pass amplifier, Schmidt trigger and circuit is amplified and filters.
The photoelectric sensor that this utility model is constituted mainly through a pair infrared-emitting diode and light sensitive diode D3, is acquired human body finger tip pulse signal.Signal utilizes the tally function of single-chip microcomputer after treatment, is measured frequency of pulse and send display module to show.Compared with cardiotachometer traditional before, realizing on the basis of accuracy of measurement, the feature that operating process is easier and with low cost.
Electronic sphygmograph of the present utility model has used singlechip technology, and it is easy to use, only need to be put gently on a sensor by finger end, can demonstrate your frequency of pulse per minute in real time.
The purpose of this utility model mainly has some feature following:
(1) the novel part of this electronic sphygmograph is to adopt infrarede emitting diode and light sensitive diode D3 to gather signal, and when Ink vessel transfusing blood volume changes, the absorbability of light also will be changed by infrared tube.Adopting infrared-emitting diode and light sensitive diode D3 to gather in the process of signal, this position is not strict with, also more succinct in hardware circuit design.
(2) finger end only need to be put on a sensor by this utility model in operation gently, can demonstrate patient's frequency of pulse per minute in real time, easy and simple to handle, easy to carry.To some crowds needing to measure heart rate in real time, use is especially prominent.And simple in construction, application is amplified and shaping circuit reduces the interference and error that gather signal, to realize the accuracy of result.
(3) adopting infrared optics detection method is the change utilizing photosignal to measure pulse capacity, when Ink vessel transfusing blood volume changes, organizing the degree of absorption to light relatively to change, utilize photoelectric sensor can measure this change, this kind of method accuracy is higher.By adopting the single-chip microcomputer of existing program can realize tally function, there is little, the result feature accurately of interference.Electronic sphygmograph also has real-time update and the function automatically saved simultaneously, adds practicality.
Claims (5)
1. the electronic sphygmograph based on infrared photoelectric sensor, it is characterized in that, including the signal acquisition circuit (1) for the infrared light of the beat pulse of detection being converted to the signal of telecommunication, the signal being connected with signal acquisition circuit amplifies and shaping circuit (2), signal amplifies and shaping circuit (2) is connected to single-chip microcomputer (3), and single-chip microcomputer (3) is connected to LCD MODULE (4).
2. a kind of electronic sphygmograph based on infrared photoelectric sensor according to claim 1, it is characterized in that, described signal acquisition circuit includes power supply VCC, infrared light emitting diode D2, light sensitive diode D3, resistance R7, resistance R8, resistance R9 and electric capacity C8, one end of wherein said resistance R7 connects power supply VCC, the other end of resistance R7 is connected with the positive pole of infrared light emitting diode D2, the minus earth of infrared light emitting diode D2；One end of resistance R8 is connected with power supply VCC, and the other end of resistance R8 is connected with one end of electric capacity C8 and the negative pole of light sensitive diode D3, the plus earth of light sensitive diode D3；The other end of electric capacity C8 is connected with shaping circuit (2) with one end of resistance R9 and signal amplification respectively, the other end ground connection of resistance R9.
3. a kind of electronic sphygmograph based on infrared photoelectric sensor according to claim 1, it is characterized in that, described signal amplifies and shaping circuit includes double, two integrated transporting discharging LM358, electric capacity C6, electric capacity C7, slide rheostat R6, resistance R5, resistance R4, slide rheostat R3, and the signal of telecommunication of light sensitive diode D3 output is connected with 5 pins of LM358, 6 pins of LM358 are connected with slide rheostat R6, and one end ground connection of slide rheostat R6, the other end is connected respectively at one end of one end of electric capacity C6 and resistance R5, the other end of electric capacity C6 and the other end of resistance R5 are connected with 7 pins of LM358 respectively, 7 pins of LM358 are also connected with one end of electric capacity C7, the other end of electric capacity C7 is connected with 3 pins of LM358, 2 pins of LM358 are connected with slide rheostat R3, one end of slide rheostat R3 is through resistance R4 ground connection, the other end connects power supply VCC；1 pin of LM358 is connected with single-chip microcomputer (3).
4. a kind of electronic sphygmograph based on infrared photoelectric sensor according to claim 1, it is characterised in that described single-chip microcomputer (3) is 89C51 single-chip microcomputer.
5. a kind of electronic sphygmograph based on infrared photoelectric sensor according to claim 1, it is characterised in that described LCD MODULE (4) is LCD1602 LCDs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201521046372.4U CN205338939U (en) | 2015-12-14 | 2015-12-14 | Pulse measurement appearance based on infrared photoelectric sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521046372.4U CN205338939U (en) | 2015-12-14 | 2015-12-14 | Pulse measurement appearance based on infrared photoelectric sensor |
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| CN205338939U true CN205338939U (en) | 2016-06-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664979A (en) * | 2017-11-09 | 2018-02-06 | 顺德职业技术学院 | Novel lower limb joint recovering Setup Controller |
| CN107802246A (en) * | 2017-11-24 | 2018-03-16 | 陕西高华知本化工科技有限公司 | Sphygmus measurement system |
| CN109480810A (en) * | 2018-10-09 | 2019-03-19 | 江西师范大学 | Pulse signal error correction method based on circular queue |
-
2015
- 2015-12-14 CN CN201521046372.4U patent/CN205338939U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107664979A (en) * | 2017-11-09 | 2018-02-06 | 顺德职业技术学院 | Novel lower limb joint recovering Setup Controller |
| CN107802246A (en) * | 2017-11-24 | 2018-03-16 | 陕西高华知本化工科技有限公司 | Sphygmus measurement system |
| CN109480810A (en) * | 2018-10-09 | 2019-03-19 | 江西师范大学 | Pulse signal error correction method based on circular queue |
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| CF01 | Termination of patent right due to non-payment of annual fee |