CN203647333U - Photoelectric heart rate measuring instrument - Google Patents
Photoelectric heart rate measuring instrument Download PDFInfo
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- CN203647333U CN203647333U CN201320877597.9U CN201320877597U CN203647333U CN 203647333 U CN203647333 U CN 203647333U CN 201320877597 U CN201320877597 U CN 201320877597U CN 203647333 U CN203647333 U CN 203647333U
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- heart rate
- measuring instrument
- rate measuring
- comparison circuit
- chip microcomputer
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Abstract
The utility model discloses a photoelectric heart rate measuring instrument characterized by orderly comprising a detection head, a block filter, a two-staged see-saw amplifier, a second order active filter, a comparison circuit and a one-chip microcomputer all in a serial connection. An optical signal with heart rate information is converted into an electric signal via photo-electricity by the detection head; the second order active filter is provided with a low pass filter; the comparison circuit is formed by a single threshold voltage comparison circuit output end in a parallel connection with a Schottky diode, so that sidelobe noise can be filtered and a square signal is acquired; the heart rate is calculated via the one chip microcomputer; the measuring instrument conducts a non-contact measurement, so stable performance and high reliability are provided; and the photoelectric heart rate measuring instrument is simply structured with easy carrying, low cost and convenient operation, thereby being suitable for various heart rate measuring occasions.
Description
Technical field
This utility model belongs to technical field of photoelectric detection, more specifically, relates to a kind of photoelectricity heart rate measuring instrument.
Background technology
Heart rate is the evaluating of the human health status that medically extensively adopts, and traditional heart rate measurement mode is stethoscope, but this mode is very inconvenient and error is larger.Occurred subsequently changing and then measuring by measuring pulse pressure the piezoelectric type heart rate measuring instrument of heart rate, but the measuring instrument of piezoelectric type is contact, troublesome poeration, sensitivity can not be guaranteed.Along with social development, the quickening of rhythm of life, design is a kind of taking easy to use as prerequisite, can quick and precisely measure human heart rate's heart rate measuring instrument, be not only clinical person, the demand of aged health monitoring in the person that is also athletic training, tourist and average family.
Utility model content
For above defect or the Improvement requirement of prior art, this utility model provides a kind of photoelectricity heart rate measuring instrument, efficiently solve the problem that heart rate measuring instrument inconvenient operation and error are large, for non-contact measurement, stable performance, reliability is high, and device structure simple, be easy to carry, cost is low, easy to operate, can be widely used in various heart rate measurement occasions.
For achieving the above object, this utility model provides a kind of photoelectricity heart rate measuring instrument, it is characterized in that, comprises successively the detecting head of serial connection, every straight wave filter, two-stage inverting amplifier, Second-Order Active Filters, comparison circuit and single-chip microcomputer; Described detecting head is for being converted to the signal of telecommunication by opto-electronic conversion by the optical signal that carries heart rate information; Described Second-Order Active Filters is low pass filter; Described comparison circuit is made up of an outfan Schottky diode in parallel of simple gate voltage limit comparison circuit, for filter side lobes noise, obtains square-wave signal; Described single-chip microcomputer is used for calculating heart rate.
Preferably, described detecting head is provided with the husk of cylindrical recesses in the middle of being, groove diameter is 1～2cm, in the housing at groove middle part just to infrared light emission pipe and infrared acceptor are set.
Preferably, also comprise the first driver, the second driver and display; Described display is made up of three charactrons, for showing in real time heart rate; Described single-chip microcomputer is connected described display by described the first driver with described the second driver respectively, for driving negative electrode and the anode of described charactron.
Preferably, also comprise alarm, described alarm connects described the second driver.
In general, the above technical scheme of conceiving by this utility model compared with prior art, has following beneficial effect:
1, realizing the measurement to heart rate by the mode of optical detection, just can measure heart rate value by finger, is non-contact measurement, device structure simply, be easy to carry, cost is low, and easy to operate, can be widely used in various heart rate measurement occasions.
2, stable performance, and reliability is high.First, be provided with two-stage and amplify, significantly improved the peak value of signal, processing and adjudicate for follow-up signal provides reliable guarantee.Secondly, be provided with every straight filtering and second-order active filter, fully filtering noise, and introduce comparison circuit, by rational decision threshold is set, further filtering noise, avoids filtered signal to be directly inputted to and in enumerator, causes error.
Brief description of the drawings
Fig. 1 is the structural representation of the photoelectricity heart rate measuring instrument of this utility model embodiment;
Fig. 2 is the structural representation of detecting head.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain this utility model, and be not used in restriction this utility model.In addition,, in each embodiment of described this utility model, involved technical characterictic just can combine mutually as long as do not form each other conflict.
Tissue is translucent to infrared light, and blood is opaque to infrared light, and the physiological characteristics of therefore utilizing the blood volume of blood vessel in finger to change with heartbeat can be changed and be measured human heart rate by the light intensity of the HONGGUANG through finger tip.This utility model utilizes the method for photodetection to measure human heart rate, design a photo-electric heart rate measuring instrument, what detector was used is infrarede emitting diode and infrared receiving tube, when infrared light is through finger, infrared receiving tube can receive infrared light, and a little less than the light receiving has and has by force, strong and weak variation is exactly frequency, namely heart rate can show the heart rate value recording by display after a series of signal is processed.
As shown in Figure 1, the photoelectricity heart rate measuring instrument of this utility model embodiment comprise detecting head, every straight wave filter, two-stage inverting amplifier, Second-Order Active Filters, comparison circuit and single-chip microcomputer.Detecting head, be connected in series successively every straight wave filter, two-stage inverting amplifier, Second-Order Active Filters, comparison circuit and single-chip microcomputer.
Wherein, detecting head is for being converted to the signal of telecommunication by opto-electronic conversion by the heart rate signal perceiving.Be electric capacity every straight wave filter, for isolated DC component.Two-stage inverting amplifier is for the ultra-weak electronic signal (being generally tens millivolts) of detecting head output is fully amplified, to ensure the accuracy of follow-up counting.Second-Order Active Filters is for filtering noise.Compared with passive filtering, active power filtering can compensate each harmonic, suppresses flickering, and filtering characteristic is not subject to the impact of system impedance etc., and controllability is good, and response is fast.Particularly, because palmic rate is lower, Second-Order Active Filters is that upper cut-off frequency is the low pass filter of 10Hz.Comparison circuit is used for obtaining square-wave signal.Particularly, comparison circuit obtains by the Schottky diode in parallel of the outfan at simple gate voltage limit comparison circuit, by threshold voltage is rationally set, and filter side lobes noise, by signal height standardization, the counting erroneous judgement of avoiding side lobe noise to cause.
Single-chip microcomputer is used for calculating heart rate.Square-wave signal, by the external interrupt mouth input of single-chip microcomputer, in the time that a positive pulse occurs, all can trigger the external interrupt of single-chip microcomputer.In the time that external interrupt occurs for the first time, start 16 digit counter T0, now T0 can constantly add counting, and while overflowing, interruption is overflowed in flip-flop number.With variable k(initial value be 0) record overflows the number of times of interruption, often overflows once, k value adds 1.By the time, when external interrupt arrives next time, calculate t=k* (n interval time between two subpulses
t-n
0) * T, wherein, n
tfor counter overflow value, n
0for enumerator initial value, the cycle that T is count pulse.Therefore, real-time heart rate N=60/t.
In addition, single-chip microcomputer also shows heart rate in real time for driving display, and display is made up of three charactrons, shows respectively hundred, ten and the individual position of heart rate N.For charactron can normally be shown, as shown in Figure 1, single-chip microcomputer is connected display by the first driver with the second driver respectively, for driving negative electrode and the anode of charactron, to ensure the reliability of measurement and the stability of demonstration.
Single-chip microcomputer also connects alarm by the second driver, and while exceeding certain limit (as) drives alarm equipment alarm for occurring at heart rate N when abnormal.
As shown in Figure 2, detecting head is provided with the husk of cylindrical recesses in the middle of being, groove diameter is 1～2cm, is as the criterion to admit a finger.In the housing at groove middle part, just to infrared light emission pipe 202 and infrared acceptor 204 are set, wherein, the two ends of infrared light emission pipe 202 apply forward voltage, and the two ends of infrared acceptor 204 apply backward voltage.
For making those skilled in the art understand better this utility model, below in conjunction with specific embodiment, the operation principle of photoelectricity heart rate measuring instrument of the present utility model is elaborated.
Finger is put into the cylindrical recesses of detecting head, the infrared light that infrared light emission pipe 202 sends penetrates finger, and in blood vessel, the variation of blood volume causes that transillumination light intensity changes, and after being received, obtains the strong and weak signal of telecommunication changing through opto-electronic conversion by infrared acceptor 204.The signal of telecommunication is through after straight wave filter isolated DC component, and peak value is about 20mV, then amplifies through two-stage inverting amplifier, and wherein, the peak value after the first order is amplified is about 200mV, and the peak value after amplify the second level is about 1.6V.Signal after amplification enters comparison circuit after Second-Order Active Filters filtering noise, comparison circuit obtains by the Schottky diode in parallel of the outfan at simple gate voltage limit comparison circuit, by threshold voltage is rationally set, filter side lobes noise, obtain fairly regular square-wave signal, high level is+5V that low level is 0V, to ensure to reach the response lag voltage of single-chip microcomputer, guarantee that each pulse can be by record effectively.Square-wave signal input single-chip microcomputer, each high level signal can trigger the external interrupt of single-chip microcomputer, and starts rolling counters forward, thereby obtains heart rate and show by display.When heart rate occurs when abnormal, Micro Controller Unit (MCU) driving alarm equipment alarm.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present utility model; not in order to limit this utility model; all any amendments of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (4)
1. a photoelectricity heart rate measuring instrument, is characterized in that, comprises successively the detecting head of serial connection, every straight wave filter, two-stage inverting amplifier, Second-Order Active Filters, comparison circuit and single-chip microcomputer;
Described detecting head is for being converted to the signal of telecommunication by opto-electronic conversion by the optical signal that carries heart rate information;
Described Second-Order Active Filters is low pass filter;
Described comparison circuit is made up of an outfan Schottky diode in parallel of simple gate voltage limit comparison circuit, for filter side lobes noise, obtains square-wave signal;
Described single-chip microcomputer is used for calculating heart rate.
2. photoelectricity heart rate measuring instrument as claimed in claim 1, is characterized in that, described detecting head is provided with the husk of cylindrical recesses in the middle of being, groove diameter is 1～2cm, in the housing at groove middle part just to infrared light emission pipe and infrared acceptor are set.
3. photoelectricity heart rate measuring instrument as claimed in claim 1 or 2, is characterized in that, also comprises the first driver, the second driver and display;
Described display is made up of three charactrons, for showing in real time heart rate;
Described single-chip microcomputer is connected described display by described the first driver with described the second driver respectively, for driving negative electrode and the anode of described charactron.
4. photoelectricity heart rate measuring instrument as claimed in claim 3, is characterized in that, also comprises alarm, and described alarm connects described the second driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877597.9U CN203647333U (en) | 2013-12-27 | 2013-12-27 | Photoelectric heart rate measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320877597.9U CN203647333U (en) | 2013-12-27 | 2013-12-27 | Photoelectric heart rate measuring instrument |
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| Publication Number | Publication Date |
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| CN203647333U true CN203647333U (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320877597.9U Expired - Fee Related CN203647333U (en) | 2013-12-27 | 2013-12-27 | Photoelectric heart rate measuring instrument |
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| CN (1) | CN203647333U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105251089A (en) * | 2015-10-30 | 2016-01-20 | 西安交通大学 | Breath controller-based on heartbeat monitoring |
| CN106527293A (en) * | 2016-12-24 | 2017-03-22 | 北京糖护科技有限公司 | Circuit for automatically identifying and analyzing insulin pen injection sound |
| CN106725408A (en) * | 2016-12-02 | 2017-05-31 | 重庆软汇科技股份有限公司 | Heart rate method of estimation and device based on adaptive digital filtering |
| WO2017113909A1 (en) * | 2015-12-29 | 2017-07-06 | 深圳贝特莱电子科技股份有限公司 | Integrated chip for measuring heart rate of human body by means of photoelectricity |
-
2013
- 2013-12-27 CN CN201320877597.9U patent/CN203647333U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105251089A (en) * | 2015-10-30 | 2016-01-20 | 西安交通大学 | Breath controller-based on heartbeat monitoring |
| WO2017113909A1 (en) * | 2015-12-29 | 2017-07-06 | 深圳贝特莱电子科技股份有限公司 | Integrated chip for measuring heart rate of human body by means of photoelectricity |
| CN106725408A (en) * | 2016-12-02 | 2017-05-31 | 重庆软汇科技股份有限公司 | Heart rate method of estimation and device based on adaptive digital filtering |
| CN106527293A (en) * | 2016-12-24 | 2017-03-22 | 北京糖护科技有限公司 | Circuit for automatically identifying and analyzing insulin pen injection sound |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20151227 |
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| EXPY | Termination of patent right or utility model |