CN207679431U - A kind of double light path sensor module - Google Patents
A kind of double light path sensor module Download PDFInfo
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- CN207679431U CN207679431U CN201720527420.4U CN201720527420U CN207679431U CN 207679431 U CN207679431 U CN 207679431U CN 201720527420 U CN201720527420 U CN 201720527420U CN 207679431 U CN207679431 U CN 207679431U
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- light source
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- photelectric receiver
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Abstract
The utility model discloses a kind of double light path sensor modules, physiology signal is acquired for being based on photoplethysmographic graphical method, the module is comprising pedestal and installs photelectric receiver on the base and two light source modules, described two light source modules are symmetricly set on the both sides of the photelectric receiver, include the light source of at least two wavelength in each light source module, it is additionally provided with light shielding part on the pedestal, and the light shielding part surrounds the photelectric receiver, there is opening on the top of the light shielding part, so that the light that the light source is sent out is after tissue diffusing reflection, it is received by the photelectric receiver.
Description
Technical field
The utility model discloses a kind of double light path sensor modules, are related to photoelectricity physiological signal collection field, can apply
In a variety of places of the long-term progress blood oxygen saturation and rhythm of the heart etc. of needs.
Background technology
Include abundant physiologic information in human pulse wave, it can be personal for assessment by acquisition, the analysis to pulse wave
Physical condition provides foundation, with the proviso that can stablize, reliably get pulse wave signal.For example, detecting sphygmus and blood oxygen saturation
The content of oxygen in blood is reflected as pulse frequency, is all basic human body physiological parameter, has in clinical analysis of diagnosis
Important role.The non-invasive monitoring method of blood oxygen saturation is generally basede on photoplethysmographic graphical method, at least need 2 kinds not
The light source of co-wavelength is into row energization.
Currently, common monitoring device load is heavier on the market, wear comfort is poor, it is difficult to meet continuous pulse for a long time
The requirement of wave blood oxygen saturation and rhythm of the heart.The research of the country such as CN201585990 and CN102961144 is attempted on finger
Detection blood oxygen saturation is simultaneously designed, and also has the product of related notion, the principle of use to be based on the market at present
Transmission-type blood oxygen saturation detects, and is easy by motion artifacts, it is difficult to realize accurate physiological parameter overload alarm prompt and sheet
Ground Real-time Feedback.In CN204520642U, using two photoelectric receiving tubes to reduce the influence of dark current, however can not but it avoid
Signal quality is unstable as caused by shifting.
To solve the above-mentioned problems, a kind of double light path sensor module is designed, it is very that can stablize acquisition physiological signal
It is necessary to.
Utility model content
In view of the shortcomings of the prior art, the utility model designs a kind of double light path sensor module, the module packet
Containing a photelectric receiver and two pairs of symmetrical light sources, the stability of signal quality can be improved.
Tissue is high scatterer, and incident light is walked in uniform dielectric with " banana-shaped " path.Photon is in human body group
It knits an interior part to be absorbed by tissue, while also having by tissue scatter and spreading in the tissue.Assuming that tissue is uniformly same
Matter, it can be generally divided into following four part：Artery, capillary, vein and bone and fat etc. are free of the portion of blood
Point, the blood in artery and capillary has different optical characteristics from the blood in tissue.When the heart contracts, arterial blood
Pipe and the absorption in capillary and scattering coefficient increase, and resulting in the pharosage that photoelectric receiving tube receives reduces.
Being generated via tissue diffusing reflection for being received at langbobier law, reception pipe receives at reception pipe
Light intensity can be expressed from the next：
In formula (1-1), βc, β1, β2, β3It is the proportionality coefficient that langbobier law first order Taylor is unfolded, Δ led
(t) and Δ lbv(t) it is that light path caused by movement changes.As can be seen that body kinematics lead to the change of light path from the formula, to
Make changing for reception pipe light intensity.In addition, movement is so that β1Δcb(t) quiltIt is discrete.In this case, light path
Change and is mainly changed by the distance between luminous tube and reception pipe and deformation is organized to generate.
A kind of double light path sensor module of the utility model design, is adopted suitable for being based on photoplethysmographic graphical method
Collect physiology signal.The module is comprising pedestal and installs photelectric receiver on the base and two light source modules,
Described two light source modules are symmetricly set on the both sides of the photelectric receiver, include at least two wavelength in each light source module
Light source, light shielding part is additionally provided on the pedestal, and the light shielding part surrounds the photelectric receiver, in the light shielding part
Top have opening so that the light that the light source is sent out is received after tissue diffusing reflection by the photelectric receiver.
Wherein, the short light source of each light source die wavelength in the block is closer to the photelectric receiver.
Further, light shielding part is made of elastic material.
The double light path sensor module of the utility model design can more stably obtain physiological signal.The module can be grown
Time Continuous pulse wave blood oxygen saturation, rhythm of the heart have stronger anti-interference ability, have a extensive future.
Description of the drawings
Fig. 1 is the top view according to one embodiment of the utility model.
Fig. 2 is the front view according to one embodiment of the utility model.
Fig. 3 is light path schematic diagram of one case study on implementation of the module in skin surface.
Specific implementation mode
To make the technical means, creative features, achievement of purpose, and effectiveness of the utility model be easy to understand, below
In conjunction with the drawings and the specific embodiments, the utility model is expanded on further.
Referring to Fig.1, one embodiment according to the present utility model uses following technical scheme：A kind of double light path sensor die
Group, which includes a photelectric receiver 4 and two pairs of light source modules 1 and 2, between light source module 1 and 2 and photelectric receiver 4
There is light shielding part 3.The light source module 1 and 2 includes at least the light source of two kinds of wavelength, respectively light source 1 and light source 2, can basis
It needs, expansion light source.The wavelength of light source 1 in light source module 1 and 2 is less than the wavelength of light source 2, and light source 1 is apart from photoelectric receiving tube
Closer to.When expansion light source, the short light source distance photelectric receiver of wavelength closer to.Light source module 1 and 2 is located at photelectric receiver 4
Both sides, spatially symmetrically, the light source of different wave length reach photelectric receiver 4 after organizing diffusing reflection.
Fig. 2 shows that the front view of a case study on implementation according to the present utility model, light shielding part 3 surround photelectric receiver 4,
There are opening, the light that light source module 1 and 2 is sent out that can not be directly entered photelectric receiver 4 on the top of light shielding part 3.The design can
With the interference for effectively avoiding leakage problem from introducing, the light that light shielding part 3 makes two pairs of light source modules 1 and 2 send out is needed by diffusing reflection
After get to photelectric receiver 4.
Fig. 3 show one case study on implementation of the module skin surface light path schematic diagram.What light source 1 and light source 2 were sent out
Light has the property of reflection, projection and refraction, and in this module, it is example that light source 1, which generates effective optical path with light path 1, and light source 2 produces
Raw effective optical path is example with light path 2, and photon is via arrival photelectric receiver 4 after epidermis, corium and subcutaneous tissue diffusing reflection.Light
Son can not be directed through light shielding part 3 and directly reach photelectric receiver 4.It uses, therefore hides in view of the module is placed on human body
Light portion 3 can be made of elastic material.
The purpose reached of the utility model is stated with effect by formula (1-1), a kind of double light of the utility model design
Road sensor module, light source module 1 and 2 is located at 4 both sides of photoelectric receiving tube, symmetrical, and 1 wavelength of light source is less than the wave of light source 2
Long 2.The interference that displacement generates can be inhibited to a certain extent by light path.Light source module 1 and 2 with photoelectric receiving tube 4
Between have light shielding part 3, can effectively avoid leakage problem introducing interference.Light shielding part 3 is not limited to shown in attached drawing, in order to effectively keep away
Exempt from the interference of leakage problem introducing, as long as the structure that can block light source direct projection to the light of photoelectric receiving tube is all can be with
's.
Light source 1 and light source 2 can be introduced by the following method on the Distance Theory apart from photoelectric receiving tube 4.By human body skin
Skin tissue is approximately half infinite medium, and diffusing of being detected at a distance apart from incidence point d is analyzed, xz coordinates are established
System, using incidence point as origin, incidence point is x-axis with test point line, and light normally incident direction is z-axis.The coordinate of incidence point is
The coordinate of (0,0,0), receiving point is (d, 0,0), and in the research of this paper, LED light tube is located at incident point coordinates, intends placing
Receiving point be located at emergent light, coordinate be (d, 0,0).According to the definition of curve, z-axis coordinate value is defined as to the function z of x0
(x)：
It can be derived according to the characteristic in " banana-shaped " path,Place, the z-axis coordinate of curve, which has, to be most worth, according to formula
(1-3) can be obtained：
Wherein, μaFor the absorption coefficient of medium, μsFor the reduced scattering coefficient of medium.As can be seen that diameter from formula (1-3)
To there are certain relationships between the value and skin penetration depth of distance.Human skin tissue has apparent layered structure
Characteristic is divided into three layers from table to inner：Epidermis, skin corium and hypodermis layer, since in skin histology, skin corium is thicker,
Penetrate skin corium enter subcutaneous tissue near infrared light decaying it is larger, can return diffuse energy can approximation ignore,
Assuming that the probability density function of stable state optical transport is ρ (ρ, z), the thickness of epidermis, skin corium is respectively dep1, dep2, can obtain
Ratio to each layer of correspondence is：
Assuming that light diffusing reflection probability in each layer medium is evenly distributed, the average value of d can be calculated by (1-6)：
The value of radial distance can be prejudged there are one theoretical according to formula (1-6).
The advantages of basic principles and main features and the utility model of the utility model have been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the present utility model is not limited to the above embodiments, described in above embodiments and description
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model
Claimed range is defined by the appending claims and its equivalent thereof.
Claims (3)
1. a kind of double light path sensor module, special for acquiring physiology signal based on photoplethysmographic graphical method
Sign is that the module includes pedestal and installs photelectric receiver on the base and two light source modules, described two
Light source module is symmetricly set on the both sides of the photelectric receiver, and the light source of at least two wavelength is included in each light source module,
Light shielding part is additionally provided on the pedestal, and the light shielding part surrounds the photelectric receiver, on the top of the light shielding part
There is opening so that the light that the light source is sent out is received after tissue diffusing reflection by the photelectric receiver.
2. double light path sensor module according to claim 1, which is characterized in that each light source die wavelength in the block is short
Light source is closer to the photelectric receiver.
3. double light path sensor module according to claim 1, which is characterized in that the light shielding part is by elastic material system
At.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720527420.4U CN207679431U (en) | 2017-05-12 | 2017-05-12 | A kind of double light path sensor module |
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| CN201720527420.4U CN207679431U (en) | 2017-05-12 | 2017-05-12 | A kind of double light path sensor module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108852309A (en) * | 2017-05-12 | 2018-11-23 | 杭州兆观传感科技有限公司 | A kind of double light path sensor module |
| WO2021253446A1 (en) * | 2020-06-19 | 2021-12-23 | 深圳市汇顶科技股份有限公司 | Blood oxygen detection apparatus and intelligent wearable device |
-
2017
- 2017-05-12 CN CN201720527420.4U patent/CN207679431U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108852309A (en) * | 2017-05-12 | 2018-11-23 | 杭州兆观传感科技有限公司 | A kind of double light path sensor module |
| WO2021253446A1 (en) * | 2020-06-19 | 2021-12-23 | 深圳市汇顶科技股份有限公司 | Blood oxygen detection apparatus and intelligent wearable device |
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