CN106859664A - A kind of noninvasive blood oxygen detector - Google Patents
A kind of noninvasive blood oxygen detector Download PDFInfo
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- CN106859664A CN106859664A CN201510914958.6A CN201510914958A CN106859664A CN 106859664 A CN106859664 A CN 106859664A CN 201510914958 A CN201510914958 A CN 201510914958A CN 106859664 A CN106859664 A CN 106859664A
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Abstract
It is made up of CPU, light source driving circuit, detection amplifying circuit, switching split circuit, filter circuit, display storage, infrared module the invention discloses a kind of noninvasive blood oxygen detector.Using LPC1114 as central processing unit, LPC1114 has high processing rate, while the complicated mathematical operation of hardware supported, main in systems to complete to be acquired external data, calculates, control function.Light source drive part point is responsible for the driving to feux rouges and infrared light tube, and infrared module completes the collection to feux rouges and infrared light, and the analog signal of collection is changed through A/D, calculated by LPC1114, and result is shown and stored again by amplifying after filtering.And then accurate, noninvasive, efficient detection blood of human body oxygen content.
Description
Technical field
The present invention relates to a kind of blood oxygen detector, especially a kind of noninvasive blood oxygen detector.
Background technology
Blood oxygen saturation is a very important Human Physiology index, is applied to the various aspects such as athletic physiology, clinical medicine, real-time monitoring, for being detected to function of human body and being evaluated.Traditional human body blood oxygen detection is invasive, that is, need to be detected by taking a blood sample, and its testing result is more accurate, but invasive and can not continuously be detected.It is our problems currently in the urgent need to address so a noninvasive, accurate, efficient human body blood device containing oxygen saturation of design.With the high speed development of infrared spectrum technology, the AAS with Lambert-beer's law (TheLambert-BeerLaw) as theoretical foundation can be used for measuring blood oxygen saturation.There are reflected light acquisition method and transmitted light acquisition method, both main distinctions are that the installation site of sensor is different.The general position enriched in the arteries such as finger or ear-lobe in the measuring point of transmission-type, the signal quality of measurement is preferable；And reflective riding position is relatively random, but in measurement, light loss of energy is relatively large, and the signal quality of measurement is bad, and the degree of accuracy is not high.Therefore, from for reliability perspectives, transmission-type oxygen saturation measurement device has good application value.
Infrared spectrum technology is to produce feux rouges and the different spectrum of two kinds of infrared light to be irradiated human finger to pipe by luminous, due to oxyhemoglobin and the difference of the absorption Spectrum characteristic of reduced hemoglobin, will produce two current signals of alternating current and direct current.The rhythmic bounce of heart drives the change of CBF, and this change can indirectly affect extinction amount, so as to generate AC compounent.Non-blood tissue, such as skin, muscle, the extinction amount of bone are constant, form DC component.Then according to Lambert-Beer laws, it is determined for blood oxygen saturation.
The content of the invention
For noninvasive, accurate, efficient detection blood of human body contains oxygen saturation, the present invention devises a kind of noninvasive blood oxygen detector.
The technical solution adopted for the present invention to solve the technical problems is：
Noninvasive blood oxygen detector is made up of CPU, light source driving circuit, detection amplifying circuit, switching split circuit, filter circuit, display storage, infrared module.
Using LPC1114 as central processing unit, LPC1114 has high processing rate, while the complicated mathematical operation of hardware supported, main in systems to complete to be acquired external data, calculates, control function.Light source drive part point is responsible for the driving to feux rouges and infrared light tube, and infrared module completes the collection to feux rouges and infrared light, and the analog signal of collection is changed through A/D, calculated by LPC1114, and result is shown and stored again by amplifying after filtering.
The light source driving circuit uses single-chip microcomputer output pulse signal, two triodes of driven to make two luminous tube light on and off according to certain rules using modulation light.
The detection amplifying circuit receives optical signal using the good current-output type photocell sensor of the linearity, and due to photocell output is current signal, and treatment for convenience increases current-voltage conversion circuit.But because the voltage signal is fainter, and feux rouges, infrared light and ambient light signal are included again, so needing signal pre-amplification.
The switching split circuit is made up of an amplifier and analog switch CD4052.Red signal light, infrared signal and natural light required for for extracting is washed, by Single-chip Controlling.
It is the bivalent high-pass filter of 0.1Hz for the low pass filter and cut-off frequency of 50Hz that the filter circuit uses cut-off frequency.Integral action from two signals of opposite in phase device after filtering, red light component and infrared light component will cancel each other with ambient light, eliminate the interference of ambient light and circuit noise, improve signal to noise ratio.This signal can follow the change of the change of light intensity and equal proportion.Mixed signal has the larger direct current signal of amplitude and faint AC signal after flowing through low pass filter, and weaker AC signal is amplified again from suitable amplifier, is gathered to single-chip microcomputer after precision rectifying.In addition, infrared light circuit is substantially completely identical with infrared circuit.
The beneficial effects of the invention are as follows：Noninvasive blood oxygen detector eliminates the high-frequency signal interference of volume pulsation wave signal using low pass filter, farthest reduce the decay of useful signal, suppress the interference of external world EMI, also human body clothes friction, the error that body kinematics brings, the reliability of data is improve, can accurate, noninvasive, efficient detection blood of human body oxygen content.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is noninvasive blood oxygen detector system construction drawing.
Fig. 2 is light source driving circuit.
Fig. 3 is detection amplifying circuit.
Fig. 4 is switching split circuit.
Fig. 5 is feux rouges 40Hz low-pass filter circuits.
Fig. 6 is feux rouges 0.1Hz second order high-pass filtering circuits.
Specific embodiment
In Fig. 1, noninvasive blood oxygen detector is made up of CPU, light source driving circuit, detection amplifying circuit, switching split circuit, filter circuit, display storage, infrared module.Using LPC1114 as central processing unit, LPC1114 has high processing rate, while the complicated mathematical operation of hardware supported, main in systems to complete to be acquired external data, calculates, control function.Light source drive part point is responsible for the driving to feux rouges and infrared light tube, and infrared module completes the collection to feux rouges and infrared light, and the analog signal of collection is changed through A/D, calculated by LPC1114, and result is shown and stored again by amplifying after filtering.
In fig. 2, the light source driving circuit uses single-chip microcomputer output pulse signal, two triodes of driven to make two luminous tube light on and off according to certain rules using modulation light.Two-way pwm pulse signal is produced by single-chip microcomputer, it is 660nm feux rouges and the infrared light of 940nm to drive two light emitting diodes to produce wavelength respectively.Train pulse is produced by single-chip microcomputer, drives two wavelength to be respectively the light emitting diode (LED) of 660nm and 940nm.The glow frequency of light emitting diode selects the integral multiple (being here 2KHz) of power frequency to reduce Hz noise.It is the pwm signal of 2KHz that single-chip microcomputer produces frequency, by controlling two ON times of light emitting diode, can form feux rouges, three time zones of infrared light and ambient light, and electric current is gathered when feux rouges, infrared light are produced.Within the ambient light time period, the equal no current of two luminous tubes passes through.
In figure 3, the detection amplifying circuit receives optical signal using the good current-output type photocell sensor of the linearity.
In fig. 4, the switching split circuit is made up of an amplifier and analog switch CD4052.Red signal light, infrared signal and natural light required for for extracting is washed, by the A of Single-chip Controlling CD4052, B ends, while gating a certain passage outputs of X and Y.When selecting Y0 or Y3 to export, amplifier works as sign-changing amplifier, gain is 1, the ambient light signal opposite polarity of input signal and the reverse of output signal after separating switching circuit, then the computing of subsequent conditioning circuit is carried out so as to eliminate the interference effect of useful signal ambient light with red signal light and infrared signal containing useful signal.When Y1 or Y2 is exported, the in-phase input end of amplifier is high impedance input, and input signal is input into without decay, makes its anti-phase input terminal potential for positive potential, and input is identical with output current potential, equivalent to a non-inverting buffer；X0, X1, X2, X3 sequence number corresponding with Y are strobed simultaneously, so by the natural light output after reversely, and separate feux rouges and infrared light, feux rouges and infrared light is processed in respective signalling channel respectively.
In fig. 5 and fig., it is the bivalent high-pass filter of 0.1Hz for the low pass filter and cut-off frequency of 50Hz that the filter circuit uses cut-off frequency.Integral action from two signals of opposite in phase device after filtering, red light component and infrared light component will cancel each other with ambient light, eliminate the interference of ambient light and circuit noise, improve signal to noise ratio.This signal can follow the change of the change of light intensity and equal proportion.Mixed signal has the larger direct current signal of amplitude and faint AC signal after flowing through low pass filter, and weaker AC signal is amplified again from suitable amplifier, is gathered to single-chip microcomputer after precision rectifying.In addition, infrared light circuit is substantially completely identical with infrared circuit.
Claims (6)
1. a kind of noninvasive blood oxygen detector is made up of CPU, light source driving circuit, detection amplifying circuit, switching split circuit, filter circuit, display storage, infrared module.
2. a kind of noninvasive blood oxygen detector according to claim 1, it is characterized in that the CPU uses LPC1114 single-chip microcomputers.
3. a kind of noninvasive blood oxygen detector according to claim 1, it is characterized in that the light source driving circuit uses modulation light, uses single-chip microcomputer output pulse signal, two triodes of driven to make two luminous tube light on and off according to certain rules.
4. a kind of noninvasive blood oxygen detector according to claim 1, it is characterized in that the detection amplifying circuit receives optical signal using the good current-output type photocell sensor of the linearity, increases current-voltage conversion circuit.
5. a kind of noninvasive blood oxygen detector according to claim 1, it is characterized in that the switching split circuit is made up of an amplifier and analog switch CD4052, washes, by Single-chip Controlling for extracting required red signal light, infrared signal and natural light.
6. a kind of noninvasive blood oxygen detector according to claim 1, it is characterized in that it is the bivalent high-pass filter of 0.1Hz for the low pass filter and cut-off frequency of 50Hz that the filter circuit uses cut-off frequency.
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| CN201510914958.6A CN106859664A (en) | 2015-12-13 | 2015-12-13 | A kind of noninvasive blood oxygen detector |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108245174A (en) * | 2018-01-15 | 2018-07-06 | 西安交通大学 | The analog circuit front-end module and detection method of a kind of reflecting light Power Capacity wave |
| CN109171764A (en) * | 2018-10-24 | 2019-01-11 | 重庆科技学院 | A kind of SCM Based blood oxygen detection method |
| CN109846492A (en) * | 2017-11-30 | 2019-06-07 | 深圳先进技术研究院 | Acquisition Circuit, blood oxygen saturation acquisition chip and device |
| CN111248889A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Pulse wave measuring device and method based on LED diode and LED display matrix |
| CN111493889A (en) * | 2020-05-19 | 2020-08-07 | 重庆市计量质量检测研究院 | Detection simulation device for blood oxygen saturation monitor |
-
2015
- 2015-12-13 CN CN201510914958.6A patent/CN106859664A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109846492A (en) * | 2017-11-30 | 2019-06-07 | 深圳先进技术研究院 | Acquisition Circuit, blood oxygen saturation acquisition chip and device |
| CN109846492B (en) * | 2017-11-30 | 2021-02-19 | 深圳先进技术研究院 | Acquisition circuit, oxyhemoglobin saturation acquisition chip and device |
| CN108245174A (en) * | 2018-01-15 | 2018-07-06 | 西安交通大学 | The analog circuit front-end module and detection method of a kind of reflecting light Power Capacity wave |
| CN108245174B (en) * | 2018-01-15 | 2019-11-08 | 西安交通大学 | A kind of the analog circuit front-end module and detection method of reflecting light Power Capacity wave |
| CN109171764A (en) * | 2018-10-24 | 2019-01-11 | 重庆科技学院 | A kind of SCM Based blood oxygen detection method |
| CN111248889A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Pulse wave measuring device and method based on LED diode and LED display matrix |
| CN111493889A (en) * | 2020-05-19 | 2020-08-07 | 重庆市计量质量检测研究院 | Detection simulation device for blood oxygen saturation monitor |
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Application publication date: 20170620 |