WO2016045452A1 - 光电容积脉搏波光电检测传感器 - Google Patents

光电容积脉搏波光电检测传感器 Download PDF

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Publication number
WO2016045452A1
WO2016045452A1 PCT/CN2015/086177 CN2015086177W WO2016045452A1 WO 2016045452 A1 WO2016045452 A1 WO 2016045452A1 CN 2015086177 W CN2015086177 W CN 2015086177W WO 2016045452 A1 WO2016045452 A1 WO 2016045452A1
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light
photosensitive tube
light emitting
emitting module
filter
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PCT/CN2015/086177
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English (en)
French (fr)
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崔予红
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成都维客亲源健康科技有限公司
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Publication of WO2016045452A1 publication Critical patent/WO2016045452A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters

Definitions

  • the present invention relates to a photoelectric detecting sensor, and more particularly to a photoelectric volume pulse wave photoelectric detecting sensor.
  • Biomedical sensors are a key device for acquiring biological information and converting it into a signal that is easy to measure and process.
  • the photoelectric pulse sensor is a pulse sensor made by a photoelectric volume method, and the pulse signal is indirectly detected by monitoring the transmittance of the distal end of the finger.
  • most of the photoelectric sensors on the market are sensors for pulse and pulse oximetry.
  • red light and infrared light are used as a light source, and the photosensitive tube is received as an optical signal.
  • the two parts are separated, mainly through transmission. Test the finger to get the pulse and blood oxygen parameters of the human body.
  • these viewpoints detect that the sensor does not interfere with the light source, and the light is processed by the scattering and flashing, and then enters the photosensitive tube for processing, resulting in poor performance, sensitivity, and precision.
  • the object of the present invention is to overcome the deficiencies of the prior art, and provide a photoelectric volume pulse wave photoelectric detecting sensor, which uses green light and infrared light as a light source, has high green light reflectivity, and reflects light intensity is high.
  • the tube has high measurement sensitivity, and the signal detected by the photosensitive tube is processed by the amplifier, so that the sensor has higher precision and better sensitivity.
  • the photosensitive tube is provided with a nano-coated filter in front of the photosensitive tube, which can effectively filter the test source and Light outside the wavelength range of the photosensitive tube.
  • Photoelectric volume pulse wave photoelectric detecting sensor which comprises a first photodetecting component, a second photodetecting component and a third photodetecting component, the first photoelectric
  • the detecting component comprises a first light emitting module, a first mirror matched with the first light emitting module, a first filter and a first photosensitive tube, and the light signal emitted by the first light emitting module is reflected by the first mirror Passing through the first filter is received by the first photosensitive tube, and the first light emitting module includes a green LED light
  • the second photodetecting component includes a second light emitting module, a second mirror, a second filter, and a second photosensitive tube that cooperate with the second light emitting module, and the second light emitting module emits
  • the light signal is received by the second mirror through the second mirror and received by the second photosensitive tube, and the second light emitting module comprises a green LED light and an infrared light LED;
  • the third photodetecting component includes a third filter and a third photosensitive tube, and the optical signals emitted by the first light emitting module and the second light emitting module sequentially penetrate the nano-coating through the reflection of the blood of the subcutaneous tissue. And the third filter is received by the third photosensitive tube.
  • the first light emitting module includes a first green LED lamp D1
  • the second transmitting module includes a second green light 1E D light D2 and an infrared light D3, a first green light D1 and a second green light.
  • the lamp D2 is coupled to the same voltage, and the negative ends of the infrared first green light D1, the second green light D2, and the infrared light D3 are connected in parallel.
  • the anode of the first photosensitive tube is connected to the first output end of the sensor through a first current limiting resistor, and the cathode of the second photosensitive tube is connected to the second output end of the sensor through a second current limiting resistor, the third photosensitive tube
  • the anode is connected to the inverting input of the amplifier, the non-inverting input of the amplifier is connected to the main circuit, and the output of the amplifier is connected to the third output of the sensor; the anode of the first photosensitive tube, the anode of the second photosensitive tube, and
  • the anodes of the third photosensitive tubes are connected in parallel and grounded.
  • the surfaces of the first filter, the second filter and the third filter are coated with a high-tech nano coating.
  • the optical signals detected by the first and third photosensitive tubes that are not in the skin surface are mainly used to compensate for non-PPG signals in the second photosensitive tube.
  • the beneficial effects of the present invention are as follows:
  • the present invention provides a photoelectric volume pulse wave photoelectric detecting sensor which uses green light and infrared light as a light source, and has high reflectivity of green light and high intensity of reflected light, and photosensitive tube measurement Highly perceptible, the signal detected by the photosensitive tube is processed by the amplifier, which makes the sensor more accurate and sensitive.
  • the photosensitive tube is coated with a nano-coated filter, which can effectively filter the test source and the photosensitive tube. Light outside the wavelength range.
  • 1 is a structural view of a sensor
  • FIG. 2 is a circuit diagram of a sensor principle.
  • a photoplethysmographic pulse wave photoelectric detecting sensor includes a first photodetecting component, a second photodetecting component, and a third photodetecting component, wherein the first photodetecting component includes a light emitting module, a first mirror, a first filter and a first photosensitive tube that cooperate with the first light emitting module, and the light signal emitted by the first light emitting module passes through the reflection of the first mirror to penetrate the first The filter is received by the first photosensitive tube, and the first light emitting module comprises a green LED lamp;
  • the second photodetecting component includes a second light emitting module, a second mirror, a second filter, and a second photosensitive tube that cooperate with the second light emitting module, and the second light emitting module emits The light signal is received by the second mirror through the second mirror and received by the second photosensitive tube, and the second light emitting module comprises a green LED light and an infrared light LED;
  • the third photodetecting component includes a third filter and a third photosensitive tube, and the optical signals emitted by the first light emitting module and the second light emitting module sequentially penetrate the nano-coating through the reflection of the blood of the subcutaneous tissue. And the third filter is received by the third photosensitive tube.
  • the first light emitting module includes a first green LED lamp D1
  • the second transmitting module includes a second green light 1E D light D2 and an infrared light D3, a first green light D1 and a second green light
  • the lamp D2 is coupled to the same voltage, and the negative ends of the infrared first green light D1, the second green light D2, and the infrared light D3 are connected in parallel.
  • the anode of the first photosensitive tube D5 is connected to the first output terminal Vout1 of the sensor through the first current limiting resistor R1
  • the cathode of the second photosensitive tube D6 is connected to the second output terminal Vout2 of the sensor through the second current limiting resistor R2.
  • the anode of the third photosensitive tube D6 is connected to the inverting input end of the amplifier, the non-inverting input terminal of the amplifier is connected to the main circuit, and the output end of the amplifier is connected to the third output end Vout3 of the sensor;
  • the first photosensitive tube D5 is The negative electrode, the positive electrode of the second photosensitive tube D6, and the negative electrode of the third photosensitive tube D4 are connected in parallel and grounded.
  • the surfaces of the first filter, the second filter and the third filter are coated with a high-tech nano coating.
  • the optical signals detected by the first and third photosensitive tubes that are not in the skin surface are mainly used to compensate for non-PPG signals in the second photosensitive tube.
  • the invention integrates a 570 nm wavelength dual green LED and a 970 nm wavelength infrared LED as a light source of the PPG photoelectric detection sensor, and integrates three high-tech nano-coating photodetection photosensitive tubes and light mirrors and filters. Light film and primary signal amplifier.
  • light emitted by a double green LED having a higher red light emissivity and a higher measurement sensitivity is absorbed by human skin tissue, and a part thereof is absorbed by oxygenated hemoglobin Hb02 in the blood, and then diffused and reflected back to emit a human body surface.
  • the light returned by the diffuse reflection is measured by the photosensitive tube D4 through the filter, and converted into an electrical signal output, that is, a human body photoelectric volume pulse wave signal is obtained, and the return light signal can reflect the volume change of the blood vessel caused by the pulse of the artery.
  • the green photoelectric signal outputted by the photosensitive tube D4 calculates the heart rate of the human body and the physiological indexes such as breathing and blood pressure through the peripheral microprocessor algorithm; after the infrared light is absorbed by the human skin tissue, part of it is absorbed by the hemoglobin HbR in the human blood and is diffused and reflected out of the human body. On the surface, the light returned by the diffuse reflection is measured by the photosensitive tube D4 through the filter, and converted into an electrical signal output, that is, the human body photoelectric volume pulse wave signal is obtained.
  • the two photoelectric volume pulse signals generated by the green LED and the infrared LED can calculate the blood oxygen saturation of the human body through the human body rhythm characteristic signal algorithm of the peripheral microprocessor.
  • the invention drives the double green LED by an external driving circuit, so that the green LED emits a light source according to design requirements, and a part of the light reflects the light that does not enter the skin surface through the mirror, and the photosensitive tube detects the signal, mainly compensating the driving circuit.
  • the light emitted by the LED keeps a constant lumen; the other part of the light passes through the blood of the human body.
  • the blood pulse of the human body is pulsed from the blood.
  • the oxygenated hemoglobin Hb02 and the reduced hemoglobin HbR in the blood flow absorb and reflect, so that the two light signals change correspondingly.
  • the light signal After the high-tech nano-layer, and the filter filters out the light in the wavelength range of the photosensitive tube, the light signal enters the photosensitive tube, and the changed light signal received by the photosensitive tube is converted into a photo-volume pulse that causes the blood volume to change due to the pulsation of the arterial blood vessel.
  • Wave signal The product pulse wave signal enters the primary amplifier for processing, and the signal detection ends.

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  • Spectroscopy & Molecular Physics (AREA)
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  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
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Abstract

一种光电容积脉搏波光电检测传感器，包括第一光电检测组件、第二光电检测组件和第三光电检测组件，所述的第一光电检测组件包括第一光发射模块、与第一光发射模块相配合的第一反射镜、第一滤光片及第一光敏管(D5)，第一光发射模块发射的光信号经过第一反射镜的反射穿透第一滤光片由第一光敏管(D5)接收，第一光发射模块包括一个绿光LED灯(D1)。该传感器采用绿光和红外光作为光源，绿光反射率高、反射的光强度大，光敏管测量感知度高，光敏管检测到的信号经放大器处理，使得传感器精度高、灵敏性好，光敏管前设置有涂布有纳米涂层的滤光片，能有效滤除非测试光源和光敏管波长范围外的光。

Description

说明书 发明名称：光电容积脉搏波光电检测传感器 技术领域
[0001] 本发明涉及一种光电检测传感器， 特别是一种光电容积脉搏波光电检测传感器 背景技术
[0002] 人体心室周期性的收缩和舒张导致主动脉的收缩和舒张， 使血流压力以波的形 式从主动脉根部幵始沿着整个动脉系统传播， 这种波称为脉搏波。 脉搏波所呈 现出的形态、 强度、 速率和节律等方面的综合信息， 很大程度上反映出人体心 血管系统中许多生理病理的血流特征。 传统的脉搏测量采用脉诊方式， 中医脉 象诊断技术就是脉搏测量在中医上卓有成效的应用， 但是受人为的影响因素较 大， 测量精度不高。 无创测量又称非侵入式测量或间接测量， 其重要特征是测 量的探测部分不侵入机体， 不造成机体创伤， 通常在体外， 尤其是在体表间接 测量人体的生理和生化参数。
[0003] 生物医学传感器是获取生物信息并将其转换成易于测量和处理信号的一个关键 器件。 光电式脉搏传感器是根据光电容积法制成的脉搏传感器， 通过对手指末 端透光度的监测， 间接检测出脉搏信号。 目前市场上的绝大多数光电传感器为 脉搏和脉搏血氧测试的传感器， 一般为红光和红外光为一组作为发光源， 光敏 管作为光信号接收， 为分离的两部分， 主要通过透射方式测试手指而得到人体 的脉搏和血氧参数。 但这些观点检测传感器未对光源的干扰， 进行处理， 光经 过散射、 闪射后进入光敏管进行处理， 导致性能， 灵敏度、 精度不好。
技术问题
[0004] 本发明的目的在于克服现有技术的不足， 提供一种光电容积脉搏波光电检测传 感器， 该传感器采用绿光和红外光作为光源， 绿光反射率高、 反射的光强度大 ， 光敏管测量感知度高， 光敏管检测到的信号经放大器处理， 使得传感器精度 更高、 灵敏性更好， 光敏管前设置有涂布有纳米涂层的滤光片， 能有效滤除非 测试光源和光敏管波长范围外的光。 问题的解决方案
技术解决方案
[0005] 本发明的目的是通过以下技术方案来实现的： 光电容积脉搏波光电检测传感器 ， 它包括第一光电检测组件、 第二光电检测组件和第三光电检测组件， 所述的 第一光电检测组件包括第一光发射模块、 与第一光发射模块相配合的第一反射 镜、 第一滤光片及第一光敏管， 第一光发射模块发射的光信号经过第一反射镜 的反射穿透第一滤光片由第一光敏管接收， 第一光发射模块包括一个绿光 LED灯
[0006] 所述的第二光电检测组件包括第二光发射模块、 与第二光发射模块相配合的第 二反射镜、 第二滤光片及第二光敏管， 第二光发射模块发射的光信号经过第二 反射镜的反射穿透第二滤光片由第二光敏管接收， 第二光发射模块包括一个绿 光 LED灯和红外光 LED灯；
[0007] 所述的第三光电检测组件包括第三滤光片和第三光敏管， 第一光发射模块和第 二光发射模块发射的光信号经过皮下组织血液的反射依次穿透纳米涂层和第三 滤光片由第三光敏管接收。
[0008] 所述的第一光发射模块包括第一绿光 LED灯 D1， 第二发射模块包括第二绿光 1E D灯 D2和红外光灯 D3， 第一绿光灯 D1和第二绿光灯 D2并联接同一电压， 红外第 一绿光灯 D1、 第二绿光灯 D2和红外光灯 D3的负极并联接地。
[0009] 所述的第一光敏管的正极通过第一限流电阻连接传感器第一输出端， 第二光敏 管的负极通过第二限流电阻连接传感器的第二输出端， 第三光敏管的正极与放 大器的反相输入端连接， 放大器的同相输入端与主电路连接， 放大器的输出端 与传感器的第三输出端连接； 所述的第一光敏管的负极、 第二光敏管的正极和 第三光敏管的负极并联后接地。
[0010] 所述的第一滤光片、 第二滤光片和第三滤光片的表面涂布有高科技纳米涂层。
[0011] 所述的第一和第三光敏管所检测的未进入皮肤表层的光信号主要用于补偿第二 光敏管中的非 PPG信号。
发明的有益效果
有益效果 [0012] 本发明的有益效果是： 本发明提供一种光电容积脉搏波光电检测传感器， 该传 感器采用绿光和红外光作为光源， ， 绿光反射率高、 反射的光强度大， 光敏管 测量感知度高， 光敏管检测到的信号经放大器处理， 使得传感器精度更高、 灵 敏性更好， 光敏管前设置有涂布有纳米涂层的滤光片， 能有效滤除非测试光源 和光敏管波长范围外的光。
对附图的简要说明
附图说明
[0013] 图 1为传感器结构图；
[0014] 图 2为传感器原理电路图。
本发明的实施方式
[0015] 下面结合附图进一步详细描述本发明的技术方案， 但本发明的保护范围不局限 于以下所述。
[0016] 如图 1和图 2所示， 光电容积脉搏波光电检测传感器， 它包括第一光电检测组件 、 第二光电检测组件和第三光电检测组件， 所述的第一光电检测组件包括第一 光发射模块、 与第一光发射模块相配合的第一反射镜、 第一滤光片及第一光敏 管， 第一光发射模块发射的光信号经过第一反射镜的反射穿透第一滤光片由第 一光敏管接收， 第一光发射模块包括一个绿光 LED灯；
[0017] 所述的第二光电检测组件包括第二光发射模块、 与第二光发射模块相配合的第 二反射镜、 第二滤光片及第二光敏管， 第二光发射模块发射的光信号经过第二 反射镜的反射穿透第二滤光片由第二光敏管接收， 第二光发射模块包括一个绿 光 LED灯和红外光 LED灯；
[0018] 所述的第三光电检测组件包括第三滤光片和第三光敏管， 第一光发射模块和第 二光发射模块发射的光信号经过皮下组织血液的反射依次穿透纳米涂层和第三 滤光片由第三光敏管接收。
[0019] 所述的第一光发射模块包括第一绿光 LED灯 D1， 第二发射模块包括第二绿光 1E D灯 D2和红外光灯 D3， 第一绿光灯 D1和第二绿光灯 D2并联接同一电压， 红外第 一绿光灯 D1、 第二绿光灯 D2和红外光灯 D3的负极并联接地。 [0020] 所述的第一光敏管 D5的正极通过第一限流电阻 Rl连接传感器第一输出端 Voutl ， 第二光敏管 D6的负极通过第二限流电阻 R2连接传感器的第二输出端 Vout2， 第 三光敏管 D6的正极与放大器的反相输入端连接， 放大器的同相输入端与主电路 连接， 放大器的输出端与传感器的第三输出端 Vout3连接； 所述的第一光敏管 D5 的负极、 第二光敏管 D6的正极和第三光敏管 D4的负极并联后接地。
[0021] 所述的第一滤光片、 第二滤光片和第三滤光片的表面涂布有高科技纳米涂层。
[0022] 所述的第一和第三光敏管所检测的未进入皮肤表层的光信号主要用于补偿第二 光敏管中的非 PPG信号。
[0023] 本发明集成了 570nm波长的双绿光 LED和 970nm波长的红外光 LED作为 PPG光 电检测传感器的光源， 同吋集成了三个高科技纳米涂层光检测光敏管以及光反 射镜和滤光片以及一级信号放大器。
[0024] 本发明中比红光发射率高、 测量感度高的双绿光 LED发射的光经过人体皮肤组 织吸收后， 一部分经由血液中的氧合血红蛋白 Hb02吸收后漫反射返回， 射出人 体表面， 漫反射返回的光经滤光片后被光敏管 D4测得， 并转化为电信号输出， 即获得人体光电容积脉搏波信号， 该返回光信号可以反映动脉血管搏动引起的 血管容积变化。 光敏管 D4输出的绿光电信号通过外围微处理器算法计算出人体 的心率和呼吸以及血压等生理指标； 红外光经过人体皮肤组织吸收后， 一部分 经人体血液中的血红蛋白 HbR吸收后漫反射出人体表面， 漫反射返回的光经滤光 片后被光敏管 D4测得， 并转化为电信号输出， 即获得人体光电容积脉搏波信号 。 绿光 LED和红外光 LED产生的两路光电容积脉搏波信号通过外围微处理器的人 体心律特征信号算法可以计算出人体的血氧饱和度。
[0025] 本发明由外部驱动电路驱动双绿光 LED， 使得绿光 LED按照设计要求发出光源 ， 光一部分通过反射镜反射出未进入皮肤表层的光， 光敏管检测等到信号， 主 要补偿驱动电路使得 LED光出的光保持恒定流明； 另一部分光通过人体皮下血液 吋由人体脉搏搏动弓 I起血液流动中的含氧血红蛋白 Hb02和还原血红蛋白 HbR吸 收后反射使得两束光信号发生相应的变化， 在经过高科技纳米层， 且由滤光片 滤除非光敏管波长范围内的光后， 光信号进入光敏管， 光敏管接收的变化的光 信号转变为反应动脉血管搏动引起血容量变化的光电容积脉搏波信号， 光电容 积脉搏波信号进入一级放大器等待处理， 信号检测结束。

Claims

权利要求书
[权利要求 1] 光电容积脉搏波光电检测传感器， 其特征在于： 它包括第一光电检测 组件、 第二光电检测组件和第三光电检测组件， 所述的第一光电检测 组件包括第一光发射模块、 与第一光发射模块相配合的第一反射镜、 第一滤光片及第一光敏管， 第一光发射模块发射的光信号经过第一反 射镜的反射穿透第一滤光片由第一光敏管接收， 第一光发射模块包括 一个绿光 LED灯；
所述的第二光电检测组件包括第二光发射模块、 与第二光发射模块相 配合的第二反射镜、 第二滤光片及第二光敏管， 第二光发射模块发射 的光信号经过第二反射镜的反射穿透第二滤光片由第二光敏管接收， 第二光发射模块包括一个绿光 LED灯和红外光 LED灯；
所述的第三光电检测组件包括第三滤光片和第三光敏管， 第一光发射 模块和第二光发射模块发射的光信号经过皮下组织血液的反射依次穿 透纳米涂层和第三滤光片由第三光敏管接收。
[权利要求 2] 根据权利要求 1所述的光电容积脉搏波光电检测传感器， 其特征在于
： 所述的第一光发射模块包括第一绿光 LED灯 Dl， 第二发射模块包 括第二绿光 1ED灯 D2和红外光灯 D3， 第一绿光灯 D1和第二绿光灯 D2 并联接同一电压， 红外第一绿光灯 Dl、 第二绿光灯 D2和红外光灯 D3 的负极并联接地。
[权利要求 3] 根据权利要求 1所述的光电容积脉搏波光电检测传感器， 其特征在于
： 所述的第一光敏管的正极通过第一限流电阻连接传感器第一输出端 ， 第二光敏管的负极通过第二限流电阻连接传感器的第二输出端， 第 三光敏管的正极与放大器的反相输入端连接， 放大器的同相输入端与 主电路连接， 放大器的输出端与传感器的第三输出端连接； 所述的第 一光敏管的负极、 第二光敏管的正极和第三光敏管的负极并联后接地
[权利要求 4] 根据权利要求 1所述的光电容积脉搏波光电检测传感器， 其特征在于
： 所述的第一滤光片、 第二滤光片和第三滤光片的表面涂布有高科技 纳米涂层。
[权利要求 5] 根据权利要求 1所述的光电容积脉搏波光电检测传感器， 其特征在于
： 所述的第一和第三光敏管所检测的未进入皮肤表层的光信号主要用 于补偿第二光敏管中的非 PPG信号。
PCT/CN2015/086177 2014-09-28 2015-08-05 光电容积脉搏波光电检测传感器 WO2016045452A1 (zh)

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