CN102274015A - Method and device for wrist strap type pulse signal extraction based on optical fiber vibration period analysis - Google Patents

Abstract

Translated fromChinese

本发明涉及光学生物信息监测。为提供抗干扰能力强，能采集脉搏等细小振动，使用简便的装置，本发明采取的技术方案是，基于光纤震动周期分析的腕带式脉搏信号提取装置，包括有：激光光源；光纤传输系统，由两段长度相等的光纤构成，一根紧贴手背皮肤，另一根紧贴手腕皮肤环绕成手腕粗细的环，并由包层保护，封装在纤维束带内；光信号数据初步处理与传输系统，接收到的来自光纤的信号通过数据的初步处理，形成信号波形，并传输到进一步的分析系统中；分析系统，使用减法器对两信号的相移进行减法操作，得出相移的时间分布函数。本发明主要应用于脉搏检测。

The invention relates to optical biological information monitoring. In order to provide a device with strong anti-interference ability, capable of collecting small vibrations such as pulse, and easy to use, the technical solution adopted by the present invention is a wristband-type pulse signal extraction device based on optical fiber vibration cycle analysis, including: a laser light source; an optical fiber transmission system , consisting of two sections of optical fiber of equal length, one close to the skin of the back of the hand, the other close to the skin of the wrist to form a wrist-thick ring, protected by a cladding, and encapsulated in a fiber bundle; the preliminary processing of optical signal data and In the transmission system, the received signal from the optical fiber undergoes preliminary data processing to form a signal waveform and transmits it to the further analysis system; the analysis system uses a subtractor to perform subtraction operations on the phase shifts of the two signals to obtain the phase shifted time distribution function. The invention is mainly applied to pulse detection.

Description

Wrist carried pulse signal extracting method and device based on optical fiber vibrations cycle analysis

Technical field

The present invention relates to the optical bio information monitoring, specifically relate to wrist carried pulse signal extraction element based on optical fiber vibrations cycle analysis.

Background technology

Fibre Optical Sensor is applied to medical domain, what mainly use is the method for diffused light tomography, be about to low injury light beam and inject comparatively weak skin surface such as finger, by the mensuration of optical parametric and the algorithm of a large amount of molding are handled, finally the number and the intravital blood oxygen saturation of pulse are monitored in real time by the cyclically-varying of blood oxygen saturation in the blood.

In a large amount of occasions, we need the more information of measuring pulse, by analysis to pulse information, and the quantitative rule of finding out wherein, and corresponding with the feeling the pulse in the traditional Chinese medical science by this, with the method for physics and the analysis of algorithm disease is carried out quantitative judgement.Also rarely has pertinent literature on the one hand at this at present.

Summary of the invention

For overcoming the deficiencies in the prior art, a kind of wrist carried pulse signal extraction element based on optical fiber vibrations cycle analysis is provided, its capacity of resisting disturbance is strong, can gather tiny vibrations such as pulse, easy to use, for reaching above-mentioned purpose, the technical scheme that the present invention takes is, wrist carried pulse signal extraction element based on optical fiber vibrations cycle analysis includes:

LASER Light Source is chosen monochromaticity light source preferably, is coupled into the optical fiber of equal in length by the mode of grating coupling or prism-coupled;

Fibre-optic transmission system (FOTS), the optical fiber that is equated by two segment length constitutes, and is close to skin of dorsum of hand for one, and another root is close to the ring that wrist skin encompasses the wrist thickness, and by the covering protection, is encapsulated in the fiber band;

Optical signal data preliminary treatment and transmission system, receive from the preliminary treatment of the signal of optical fiber by data, form signal waveform, and be transferred in the further analytical system;

Analytical system uses subtractor that subtraction is carried out in the phase shift of two signals, draws the time distribution function of phase shift, promptly carries out the conversion of pulse vibrations time distribution function by phase shift, with the vibrations cycle of the detected live body pulse of this real-time monitoring, amplitude.

Wrist carried pulse signal extracting method based on optical fiber vibrations cycle analysis comprises the steps:

Choose monochromaticity LASER Light Source preferably, the mode by grating coupling or prism-coupled is coupled into the optical fiber that two segment length equate;

With the optical fiber that two segment length equate, be close to skin of dorsum of hand for one, another root is close to the ring that wrist skin encompasses the wrist thickness, and by the covering protection, is encapsulated in the fiber band;

With receive from the preliminary treatment of the signal of two optical fiber by data, form two signal waveforms;

Use subtractor that subtraction is carried out in the phase shift of two signals, draw the time distribution function of phase shift, promptly carry out the conversion of pulse vibrations time distribution function, with the vibrations cycle of the detected live body pulse of this real-time monitoring, amplitude by phase shift.

The present invention has following technique effect:

The present invention adopts the processing method of Fibre Optical Sensor acquired signal, phase shift difference to obtain pulse signal, have simple in structure, obtain data accurately, be subjected to the little characteristics of external interference.

Description of drawings

Fig. 1 is a principle assumption diagram of the present invention.

The specific embodiment

Fibre Optical Sensor is widely used in perimeter alarm, and its sensitivity to small vibrations is high.In addition, between the diffused light tomography by blood oxygen saturation and the live body only the mode by clamping be connected, drop easily at the volley, the monitoring effect of personnel's health that needs are moved in a large number is also not obvious.Particularly be applied in the individual combat occasion, many factor relations such as battlefield soldier's physical consumption, pulse parameter are to personnel's standard configuration of fight.Another aspect, fibre system have the function of natural anti-electromagnetic interference.

Usually used sensor fibre adopts the communications optical cable of armouring, and it can guarantee still can gather tiny vibrations under the influence that is not subjected to extraneous changeable climate and adverse circumstances.

When optical signal was delivered into optical fiber via laser instrument, detector can be handled the optical signal that receives.And real-time reflecting receives the phase place of optical signal.Generally sensing optic cable is not subjected to the not variation of transmission of any interference or light, and the phase place of optical signal will not change yet so; Corresponding on the detector being a metastable waveform.When sensor fibre is moved or during the interference that shakes, the transmission mode of optical signal will change.

For following application scenario, sensor fibre does not have fixed phase place as reference, therefore carries out following correction from using method.

System is made of four parts, is respectively LASER Light Source, Transmission Fibers, data preliminary treatment and transmission system, peripheral fibres band four parts.

First, LASER Light Source, the LASER Light Source kind of Sheng Chaning is more in the market, chooses and should suitably lay particular stress on monochromaticity light source preferably.The mode of LASER Light Source by grating coupling or prism-coupled is coupled and counts optical fiber.

Second portion, fibre-optic transmission system (FOTS).The optical fiber that is equated by two segment length constitutes, and is close to skin of dorsum of hand for one, and another root is close to the ring of wrist skin two ends fiber optic loop coiled wrist thickness, and by the covering protection, is encapsulated in the fiber band.

Third part is optical signal data preliminary treatment and transmission system.The signal that receives forms signal waveform by the preliminary treatment of data, analyzes and produces pulse signal, and be transferred in the further analytical system.

The 4th part was mentioned just now, and main effect has two, 1, can be subjected to good protection through the optical fiber cable of fiber band parcel.2, the fiber band can make optical fiber be fixed on preferably on the detected live body wrist, and can make it well to press close to the pulse position by the elasticity scaling, obtains final signal.

Wherein applied to the subtraction principle, be described below.

In the motion of detected live body, can produce the natural error of system, for example detected live body can produce absolute phase deviation to optical fiber in the absolute movement of carrying out, and what the signal processing method of this moment should be with periphery monitoring is different than quiet environment relatively.So processing method is the subtraction principle.Two ends optical fiber keeps static mutually, so have identical phase deviation respectively at wrist pulse place and the back of the hand place with respect to absolute movement system.Use subtractor that subtraction is carried out in the phase shift of two signals at accepter one end, draw the time distribution function of phase shift, can carry out the conversion of pulse vibrations time distribution function by phase shift, with the vibrations cycle of the detected live body pulse of this real-time monitoring, amplitude, and the relation of the change in topology by wherein, being the pulse in later stage---the support on the hardware has been done in the tcm signal analysis.It should be noted that needs signal subtraction process system more accurately in the whole process, so that extract useful pulse information from complicated background.

The whole system principle as shown in drawings.

Claims (2)

1. the wrist carried pulse signal extraction element based on optical fiber vibrations cycle analysis is characterized in that, includes:

LASER Light Source is chosen monochromaticity light source preferably, is coupled into the optical fiber of equal in length by the mode of grating coupling or prism-coupled;

Fibre-optic transmission system (FOTS), the optical fiber that is equated by two segment length constitutes, and is close to skin of dorsum of hand for one, and another root is close to the ring that wrist skin encompasses the wrist thickness, and by the covering protection, is encapsulated in the fiber band;

Optical signal data preliminary treatment and transmission system, receive from the preliminary treatment of the signal of optical fiber by data, form signal waveform, and be transferred in the further analytical system;

Analytical system uses subtractor that subtraction is carried out in the phase shift of two signals, draws the time distribution function of phase shift, promptly carries out the conversion of pulse vibrations time distribution function by phase shift, with the vibrations cycle of the detected live body pulse of this real-time monitoring, amplitude.

2. the wrist carried pulse signal extracting method based on optical fiber vibrations cycle analysis is characterized in that, comprises the steps:

Choose monochromaticity LASER Light Source preferably, the mode by grating coupling or prism-coupled is coupled into the optical fiber that two segment length equate;

With the optical fiber that two segment length equate, be close to skin of dorsum of hand for one, another root is close to the ring that wrist skin encompasses the wrist thickness, and by the covering protection, is encapsulated in the fiber band;

With receive from the preliminary treatment of the signal of two optical fiber by data, form two signal waveforms;

Use subtractor that subtraction is carried out in the phase shift of two signals, draw the time distribution function of phase shift, promptly carry out the conversion of pulse vibrations time distribution function, with the vibrations cycle of the detected live body pulse of this real-time monitoring, amplitude by phase shift.

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