CN102973259A - Photoelectric heart rate measuring circuit - Google Patents
Photoelectric heart rate measuring circuit Download PDFInfo
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- CN102973259A CN102973259A CN2012105017334A CN201210501733A CN102973259A CN 102973259 A CN102973259 A CN 102973259A CN 2012105017334 A CN2012105017334 A CN 2012105017334A CN 201210501733 A CN201210501733 A CN 201210501733A CN 102973259 A CN102973259 A CN 102973259A
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Abstract
The invention discloses a photoelectric heart rate measuring circuit, relates to a heart rate measuring technique, and aims to provide a finger tip type photoelectric heart rate measuring circuit with the advantages that the carrying is convenient and the measurement is convenient according to a Lamber Beer rule. The photoelectric heart rate measuring circuit adopts the technical scheme that the photoelectric heart rate measuring circuit comprises a photoelectric sensor, a signal preprocessing unit and a data processing unit, wherein the photoelectric sensor comprises an infrared transmission circuit and an infrared receiving circuit, the signal output end of the infrared receiving circuit is connected with the input end of the signal preprocessing unit, and the output end of the signal preprocessing unit is connected with the input end of the data processing unit.
Description
Technical field
The present invention relates to the heart rate measurement technology, especially a kind of heart rate measurement circuit based on photosignal.
Background technology
Heart rate is an important parameter of reaction human health status.The method of existing measurement heart rate mainly comprises feels the pulse or stethoscope.Such measuring method all relies on heart beating or the pulsation number of times in the artificial statistics one minute, has larger error.In addition, when adopting stethoscope, stethoscope earpiece need to be pressed close to patient skin as much as possible, especially during winter, for the patient brings a lot of inconvenience.If the patient is the child, because receiver is ice-cold, the child often cries and screams, so that diagnosis is difficult to carry out.
According to lambert Bill (Lamber Beer) law, material is directly proportional at the absorbance at certain wavelength place and its concentration.We can legitimate inference so: when the illumination of constant wavelength is mapped on the tissue, the light intensity that absorbs, measures behind the reflection loss by tissue will reflect the architectural feature of illuminated position tissue to a certain extent.
Those skilled in the art all know heart rate and pulse is synchronous, are equivalent to the measurement pulse so measure the human heart rate.And pulse mainly contains human body artery diastole and contraction generation, and at the human body finger tip, the tremulous pulse component content of tissue is higher, and relative other people soma of finger tip thickness is thinner, and it is relatively large to see through the light intensity that detects behind the finger.
Summary of the invention
The objective of the invention is provides a kind of photo-electric heart rate measurement device for the human body finger tip according to defective and lambert Bill (Lamber Beer) law of prior art.
The technical solution used in the present invention is such: comprise electro-optical pickoff, Signal Pretreatment unit and data processing unit; Described electro-optical pickoff comprises infrared transmitter and infrared radiation receiving circuit; The signal output part of infrared radiation receiving circuit is connected with the input of Signal Pretreatment unit; The outfan of Signal Pretreatment unit is connected with the input of data processing unit.
Preferably, described electro-optical pickoff is arranged in and detects box, and the center of described detection box one side has the hole, and bore dia is 1.5 ~ 1.8cm; In the detection box, have upper spacer and lower clapboard; Upper spacer is positioned at the top in hole, and lower clapboard is positioned at the below in hole; And the identical through hole of size is all arranged on upper spacer and the lower clapboard, and described two through hole lines of centres straight down; Collecting lens also is installed on the through hole of upper spacer; Be fixed with infrared transmitter in the space of the inner upper spacer of detection box top; Be installed with infrared radiation receiving circuit in the space below detecting the inner lower clapboard of box.
Preferably, described infrared transmitter comprises switch, collective optics, light emitting diode, stabilivolt, the first current-limiting resistance and the second current-limiting resistance; The anode of described light emitting diode is connected with direct voltage source by switch; The negative electrode of light emitting diode is connected with ground by the first current-limiting resistance; The negative electrode of described stabilivolt is connected the plus earth of stabilivolt by the second current-limiting resistance with direct voltage source; Described light emitting diode be positioned at collecting lens directly over.
Preferably, infrared radiation receiving circuit comprises phototriode and the 3rd resistance; The colelctor electrode of described phototriode is connected grounded emitter with direct voltage source; Described phototriode be positioned at the lower clapboard through hole under.
Preferably, also be provided with collecting lens on the through hole of described lower clapboard.
Preferably, described signal processing unit comprises filter circuit and amplifying circuit; The input of described filter circuit is connected with the outfan of infrared radiation receiving circuit; The outfan of filter circuit is connected with the input of amplifying circuit; The outfan of amplifying circuit is connected with the input of data processing unit.
Preferably, described signal processing unit comprises filter circuit and amplifying circuit; The input of described amplifying circuit is connected with the outfan of infrared radiation receiving circuit; The outfan of amplifying circuit is connected with the input of filter circuit; The outfan of filter circuit is connected with the input of data processing unit.
Preferably, described data processing unit comprises enumerator and central processing unit; The pulse signal input terminal of enumerator is connected with any end of the 3rd resistance; The pulse number outfan of enumerator is connected with the input of central processing unit.
In sum, owing to adopted technique scheme, the invention has the beneficial effects as follows:
Easy to detect, circuit structure is simple, be easy to carry, and the present invention also provides a kind of improved detection box structure, so that accuracy of detection improves greatly.
Description of drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is principle of the invention block diagram.
Fig. 2 is that the present invention detects the box structural representation.
Fig. 3 is the infrared transmitter circuit diagram.
Fig. 4 is the infrared radiation receiving circuit circuit diagram.
Labelling among the figure: 1 for detecting the box housing; 2 is the hole on the sidewall; 3 is upper spacer; 4 is lower clapboard; 5 is the upper spacer through hole; 6 is the lower clapboard through hole; 7 is infrared transmitter; 8 is infrared radiation receiving circuit.
The specific embodiment
Disclosed all features in this description, or the step in disclosed all methods or the process except mutually exclusive feature and/or step, all can make up by any way.
Disclosed arbitrary feature in this description (comprising any accessory claim, summary and accompanying drawing) is unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, unless special narration, each feature is an example in a series of equivalences or the similar characteristics.
Such as Fig. 1, the present invention includes electro-optical pickoff, Signal Pretreatment unit and data processing unit; Described electro-optical pickoff comprises infrared transmitter and infrared radiation receiving circuit; The signal output part of infrared radiation receiving circuit is connected with the input of Signal Pretreatment unit; The outfan of Signal Pretreatment unit is connected with the input of data processing unit.
Wherein, the preferred structure of described infrared transmitter is such: comprise K switch, light emitting diode D1, stabilivolt D2, current-limiting resistance R1 and current-limiting resistance R2; The anode of described light emitting diode D1 is connected with direct voltage source by K switch; The negative electrode of light emitting diode D1 is connected with ground by current-limiting resistance R1; The negative electrode of described stabilivolt D2 is connected the plus earth of stabilivolt D2 by current-limiting resistance R2 with direct voltage source.
The preferred structure of infrared radiation receiving circuit can be like this: comprise phototriode Q1 and resistance R 3; The colelctor electrode of described phototriode Q1 is connected with direct voltage source, its grounded emitter.
In order to prevent that human finger produces displacement with respect to detection light source in measuring process, the invention allows for special-purpose detection box.Such as Fig. 2, the detection box structure among the present invention is such: described detection box can be the box of arbitrary shape, and the center of one side has hole 2, and bore dia is 1.5 ~ 1.8cm, is convenient to human finger and enters, but have certain limit effect.
In the detection box, have upper spacer 3 and lower clapboard 4, or upper limit platform and lower limit platform.Concrete, perforate 2 on the sidewall is as the boundary, and upper spacer 3 levels are installed on that to detect box inner and be positioned at the top in hole 2, aligns with the top edge in hole 2 or tangent, the horizontal installation and measuring boxes of lower clapboard 4 are inner and be positioned at the below in hole 2, align with the lower limb in hole 2 or tangent.And the identical through hole 5,6 of size is arranged all on upper spacer 3 and the lower clapboard 4, through hole 5,6 effect are that light is passed through, so described two through holes 5,6 lines of centres are because of straight down, to guarantee that Infrared can the through hole by upper spacer sees through finger and enters infrared receiver under the lower clapboard through hole, such as phototriode.
Preferably, can collecting lens be installed at the through hole 5 at upper spacer, so that infrared light is comparatively concentrated, improve light intensity.
Detect in the space of the inner upper spacer of box 3 tops and be fixed with infrared transmitter 7, photodiode be positioned at the upper spacer through hole directly over.Be installed with infrared radiation receiving circuit 8 in the space below detecting the inner lower clapboard 4 of box.Also can be provided with collecting lens on the through hole of described lower clapboard 4, thereby improve detection sensitivity.
Signal processing unit in this device comprises filter circuit and amplifying circuit; Described filter circuit is used for the High-frequency Interference of filtered signal; Concrete, filter circuit can be that a cut-off frequency is the low pass filter of 200Hz.The input of filter circuit is connected with the outfan of electro-optical pickoff, the outfan of filter circuit is connected with the input of amplifying circuit, the effect of amplifying circuit is that signal is suitably amplified, the effect of amplifying circuit is in order to realize Signal Matching, the setting of its gain depends on the size that DC voltage source size that the phototriode pipe collector connects and data processing unit can identification signals, if dc source is 3.3V, the range of signal that data processing unit can be processed is 0 ~ 9V, and the signal of then infrared radiation receiving circuit being exported amplifies 2 times and then can realize preferably Signal Matching.Under the instruction of this part, those skilled in the art are not difficult to know, when if the signal magnitude scope that the signal magnitude scope of infrared radiation receiving circuit output and data processing unit can receive is consistent, can remove amplifying circuit, thereby the heart rate measurement device of more being simplified.Under the instruction of this part, those skilled in the art can arrive by reasonable prediction equally, and the order of connection of amplifying circuit and filter circuit can be put upside down.
Described data processing unit among the present invention comprises enumerator and central processing unit; The pulse signal input terminal of enumerator is connected with any end of resistance R 3; The pulse number outfan of enumerator is connected with the input of central processing unit.Central processing unit further exports heart rate to higher level's circuit to be continued to process or show by display device.
The present invention is not limited to the aforesaid specific embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (8)
1. a photo-electric heart rate measurement device is characterized in that, comprising: electro-optical pickoff, Signal Pretreatment unit and data processing unit; Described electro-optical pickoff comprises infrared transmitter and infrared radiation receiving circuit; The signal output part of infrared radiation receiving circuit is connected with the input of Signal Pretreatment unit; The outfan of Signal Pretreatment unit is connected with the input of data processing unit.
2. photo-electric heart rate measurement device according to claim 1 is characterized in that, described electro-optical pickoff is arranged in and detects box, and the center on described detection box one sidewall has the hole, and bore dia is 1.5 ~ 1.8cm; In the detection box, have upper spacer and lower clapboard; The upper spacer level is fixed in the top of detecting in the box and being positioned at the hole, and upper spacer aligns with the top edge in hole; The lower clapboard level is fixed in the below of detecting in the box and being positioned at the hole, and lower clapboard aligns with the lower limb in hole; And the identical through hole of size is all arranged on upper spacer and the lower clapboard, and described two through hole lines of centres straight down; Collecting lens also is installed on the through hole of upper spacer; Be fixed with infrared transmitter in the space of the inner upper spacer of detection box top; Be installed with infrared radiation receiving circuit in the space below detecting the inner lower clapboard of box.
3. photo-electric heart rate measurement device according to claim 2 is characterized in that, described infrared transmitter comprises switch, light emitting diode, stabilivolt, the first current-limiting resistance and the second current-limiting resistance; The anode of described light emitting diode is connected with direct voltage source by switch; The negative electrode of light emitting diode is connected with ground by the first current-limiting resistance; The negative electrode of described stabilivolt is connected the plus earth of stabilivolt by the second current-limiting resistance with direct voltage source; Described light emitting diode be positioned at collecting lens directly over.
4. according to claim 2 or 3 described photo-electric heart rate measurement device, it is characterized in that infrared radiation receiving circuit comprises phototriode and the 3rd resistance; The colelctor electrode of described phototriode is connected grounded emitter with direct voltage source; Described phototriode be positioned at the lower clapboard through hole under.
5. photo-electric heart rate measurement device according to claim 4 is characterized in that, also is provided with collecting lens on the through hole of described lower clapboard.
6. photo-electric heart rate measurement device according to claim 4 is characterized in that, described signal processing unit comprises filter circuit and amplifying circuit; The input of described filter circuit is connected with the outfan of infrared radiation receiving circuit; The outfan of filter circuit is connected with the input of amplifying circuit; The outfan of amplifying circuit is connected with the input of data processing unit.
7. photo-electric heart rate measurement device according to claim 4 is characterized in that, described signal processing unit comprises filter circuit and amplifying circuit; The input of described amplifying circuit is connected with the outfan of infrared radiation receiving circuit; The outfan of amplifying circuit is connected with the input of filter circuit; The outfan of filter circuit is connected with the input of data processing unit.
8. photo-electric heart rate measurement device according to claim 7 is characterized in that, described data processing unit comprises enumerator and central processing unit; The pulse signal input terminal of enumerator is connected with any end of the 3rd resistance; The pulse number outfan of enumerator is connected with the input of central processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105017334A CN102973259A (en) | 2012-11-30 | 2012-11-30 | Photoelectric heart rate measuring circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105017334A CN102973259A (en) | 2012-11-30 | 2012-11-30 | Photoelectric heart rate measuring circuit |
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| CN102973259A true CN102973259A (en) | 2013-03-20 |
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| CN2012105017334A Pending CN102973259A (en) | 2012-11-30 | 2012-11-30 | Photoelectric heart rate measuring circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103156592A (en) * | 2013-03-29 | 2013-06-19 | 无锡盟欣智能科技有限公司 | Wireless optical electrocardio detecting instrument |
| CN104146720A (en) * | 2014-08-06 | 2014-11-19 | 华侨大学 | Detection equipment for fast detecting fatigue |
| WO2017166463A1 (en) * | 2016-04-01 | 2017-10-05 | 深圳市汇顶科技股份有限公司 | Conversion circuit, heartbeat current signal conversion device and method, and heartbeat detection system |
| CN113288552A (en) * | 2020-02-24 | 2021-08-24 | 白露 | Ankle guard |
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| US5339810A (en) * | 1993-05-03 | 1994-08-23 | Marquette Electronics, Inc. | Pulse oximetry sensor |
| EP0619880B1 (en) * | 1991-12-30 | 1997-04-09 | Futrex, Inc. | Improved non-invasive near-infrared quantitative measurement instrument |
| DE102005003678A1 (en) * | 2005-01-26 | 2006-08-03 | Biosign Gmbh | Blood pressure and pulse rate variability measurement device for a mammal has a blood pressure and pulse measurement device for connection to a limb extremity with a recording and analysis device connected to the measurement device |
| CN102395311A (en) * | 2009-03-05 | 2012-03-28 | 英戈·弗洛尔 | Diagnostic measuring device |
| CN202235355U (en) * | 2011-09-21 | 2012-05-30 | 刘元田 | Voice reading and alarming heart rate monitor |
| CN102647941A (en) * | 2009-10-06 | 2012-08-22 | 皇家飞利浦电子股份有限公司 | Method and system for carrying out photoplethysmography |
| CN203016941U (en) * | 2012-11-30 | 2013-06-26 | 刘庆国 | Photoelectric type heart rate measuring circuit |
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2012
- 2012-11-30 CN CN2012105017334A patent/CN102973259A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0619880B1 (en) * | 1991-12-30 | 1997-04-09 | Futrex, Inc. | Improved non-invasive near-infrared quantitative measurement instrument |
| US5339810A (en) * | 1993-05-03 | 1994-08-23 | Marquette Electronics, Inc. | Pulse oximetry sensor |
| DE102005003678A1 (en) * | 2005-01-26 | 2006-08-03 | Biosign Gmbh | Blood pressure and pulse rate variability measurement device for a mammal has a blood pressure and pulse measurement device for connection to a limb extremity with a recording and analysis device connected to the measurement device |
| CN102395311A (en) * | 2009-03-05 | 2012-03-28 | 英戈·弗洛尔 | Diagnostic measuring device |
| CN102647941A (en) * | 2009-10-06 | 2012-08-22 | 皇家飞利浦电子股份有限公司 | Method and system for carrying out photoplethysmography |
| CN202235355U (en) * | 2011-09-21 | 2012-05-30 | 刘元田 | Voice reading and alarming heart rate monitor |
| CN203016941U (en) * | 2012-11-30 | 2013-06-26 | 刘庆国 | Photoelectric type heart rate measuring circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103156592A (en) * | 2013-03-29 | 2013-06-19 | 无锡盟欣智能科技有限公司 | Wireless optical electrocardio detecting instrument |
| CN103156592B (en) * | 2013-03-29 | 2016-12-28 | 深圳英盟欣科技有限公司 | Wireless optical electrocardio survey meter |
| CN104146720A (en) * | 2014-08-06 | 2014-11-19 | 华侨大学 | Detection equipment for fast detecting fatigue |
| WO2017166463A1 (en) * | 2016-04-01 | 2017-10-05 | 深圳市汇顶科技股份有限公司 | Conversion circuit, heartbeat current signal conversion device and method, and heartbeat detection system |
| CN113288552A (en) * | 2020-02-24 | 2021-08-24 | 白露 | Ankle guard |
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Application publication date: 20130320 |