CN210300958U - Built-in surrounding type signal detection structure of illuminating part of PPG sensor - Google Patents
Built-in surrounding type signal detection structure of illuminating part of PPG sensor Download PDFInfo
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- CN210300958U CN210300958U CN201920577384.1U CN201920577384U CN210300958U CN 210300958 U CN210300958 U CN 210300958U CN 201920577384 U CN201920577384 U CN 201920577384U CN 210300958 U CN210300958 U CN 210300958U
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Abstract
The utility model discloses a built-in surrounding type signal detection structure of a light emitting part of a PPG sensor, which comprises a basal disc, a plurality of light emitting parts and a plurality of light sensing parts, wherein the light emitting parts and the light sensing parts are arranged on the basal disc; the light-emitting pieces are distributed in an annular array; the photosensitive pieces surround the luminous pieces and are distributed in an annular array mode, the photosensitive pieces coincide with the centers of the luminous piece arrays, and the photosensitive pieces receive light rays emitted by the luminous pieces. Breaks the medical value of current single wavelength photoelectric sensor to human physiological signal monitoring and the restriction of detection signal object scope, utilizes the utility model discloses can monitor physiological indexes such as human rhythm of the heart, blood oxygen, blood pressure, blood sugar, blood lipid simultaneously. The signal-to-noise ratio of the PPG signal in a motion state or a static state can be effectively improved, the rear-end PPG signal processing device can process the signal conveniently, and more accurate human body parameters can be obtained.
Description
Technical Field
The utility model relates to a bio-signal sensor field especially relates to a built-in surrounding type signal detection structure of LED of PPG sensor.
Background
The detection of human body motion heart rate by using a photoplethysmography (PPG) technology is an application of an infrared nondestructive detection technology in biomedicine. The heart rate is calculated from the obtained pulse waveform by utilizing a photoelectric sensor to detect the difference of the reflected light intensity after the absorption of blood and tissues of a human body, tracing the change of the volume of a blood vessel in a cardiac cycle.
Currently, photoelectric structures with single wavelength are mature in the market, for example, most heart rate photoelectric detection sensors adopt a single 520nm LED and photoelectric receiving tube combined structure, blood oxygen photoelectric detection sensors adopt a single 650nm LED and photoelectric receiving tube combined structure, and other wavelength photoelectric monitoring is still under search. The current technical means is difficult to realize the integration of the multi-wavelength photoelectric transceiving module at the chip level, and under the limitation of the condition, the correlation among various human physiological indexes has to be ignored, so that the medical value of the monitored physiological signals is limited, and the monitoring object range of the photoelectric sensor is also limited.
Meanwhile, the combined structure of the LED lamp and the photoelectric receiving tube of most of PPG photoelectric detection sensors in the current market has the problems of unreasonable optical structure design and low light energy utilization efficiency, so that the PPG signal intensity and effective signal components in the PPG signals received by the photoelectric receiving tube are low.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a surrounding signal detection structure with a built-in light emitting element for a PPG sensor, which comprises a base plate, and a plurality of light emitting elements and a plurality of light sensing elements arranged on the base plate; the light-emitting pieces are distributed in an annular array; the photosensitive pieces surround the luminous pieces and are distributed in an annular array mode, the photosensitive pieces coincide with the centers of the luminous piece arrays, and the photosensitive pieces receive light rays emitted by the luminous pieces.
Further, each of the light emitting members emits light at a different wavelength, and each of the light sensing members is provided with a filter device for the different wavelength.
Preferably, the light emitting member is an LED lamp, and the light sensing member is a photo-receiving tube.
Preferably, the plurality of light emitting elements are 4 LED lamps, the plurality of light sensing elements are 4 photoelectric receiving tubes, and a connecting line of two opposite LED lamps and a connecting line of two opposite photoelectric receiving tubes form an angle of 45 degrees.
Preferably, the plurality of light emitting elements are 4 LED lamps, the plurality of light sensing elements are 8 photoelectric receiving tubes, and 4 of the 8 photoelectric receiving tubes are disposed on an extension line of a connecting line of the two opposite LED lamps.
The beneficial effects of the utility model reside in that: breaks the medical value of current single wavelength photoelectric sensor to human physiological signal monitoring and the restriction of detection signal object scope, utilizes the utility model discloses can monitor physiological indexes such as human rhythm of the heart, blood oxygen, blood pressure, blood sugar, blood lipid simultaneously. The signal-to-noise ratio of the PPG signal in a motion state or a static state can be effectively improved, the rear-end PPG signal processing device can process the signal conveniently, and more accurate human body parameters can be obtained.
Drawings
Fig. 1 is a schematic view of a first embodiment of the present invention;
fig. 2 is a schematic view of a second embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a built-in surrounding type signal detection structure of a light emitting part of a PPG sensor, which comprises a basal disc, a plurality of light emitting parts and a plurality of light sensing parts, wherein the light emitting parts and the light sensing parts are arranged on the basal disc; the light-emitting pieces are distributed in an annular array; the photosensitive pieces surround the luminous pieces and are distributed in an annular array mode, the photosensitive pieces coincide with the centers of the luminous piece arrays, and the photosensitive pieces receive light rays emitted by the luminous pieces.
Utilize the illuminating part to embed, the structure of illuminating part is surrounded to the sensitization piece, enables make full use of illuminating part's transmission light, avoids light to cause the waste to the peripheral scattering, improves the light energy utilization ratio. The light-sensitive piece can effectively improve the intensity of light signals transmitted by a human body and received by the light-sensitive piece, can add the intensity of received PPG signals, increases the signal-to-noise ratio of the PPG signals, and can facilitate the processing of the rear-end PPG signal processing device on the signals to obtain more accurate human body parameters.
Further, each of the light emitting members emits light at a different wavelength, and each of the light sensing members is provided with a filter device for the different wavelength. Aiming at the requirement of an acquisition scheme, the components of the luminous piece and the photosensitive piece under different wavelengths are configured.
Based on a multi-wavelength photoelectric integrated structure, a plurality of wavelength light sources and a photosensitive part with a plurality of wavelength filtering devices are integrated inside the photoelectric integrated structure, a plurality of physiological characteristics are synchronously monitored by utilizing the multi-wavelength photoelectric integrated structure, and the monitoring results are integrated to give a human physiological characteristic value with more medical value.
Preferably, the light emitting member is an LED lamp, and the light sensing member is a photo-receiving tube.
As shown in fig. 1, in a preferred embodiment of the present invention, the light emitting elements are 4 LED lamps, the light receiving elements are 8 photo-receiving tubes, and the 4 LED lamps are distributed in an annular array; 8 photoelectric receiving tubes surround the light emitting piece and are distributed in an annular array, and the photoelectric receiving tubes are coincided with the center of the LED lamp array; 4 of the 8 photoelectric receiving tubes are arranged on the extension line of the connecting line of the two opposite LED lamps. The centers of the 4 LED lamp arrays are used as the original points of the plane rectangular coordinate system, the connecting lines of the 4 LED lamps and the original points form 90 degrees with each other, and form 45 degrees with the abscissa axis and the ordinate axis. Based on the above, 8 photoelectric receiving tubes surround the LED lamp to form an annular array, wherein 4 photoelectric receiving tubes are disposed on the coordinate axis, and the other four photoelectric receiving tubes are disposed on the extension line of the LED lamp and the origin. The light that the LED lamp was launched back through human skin, and 8 photoelectric receiving tubes can evenly receive the light of reflection back, have guaranteed the effective utilization of the light of reflection back, do not waste the light signal. The photoelectric receiving tube can be provided with a light filtering device to receive light with specific wavelength, so that the accuracy of a detection signal is improved.
As shown in fig. 2, in a second embodiment of the present invention, the light emitting elements are 4 LED lamps, the light sensing elements are 4 photo-electricity receiving tubes, and the 4 LED lamps are distributed in an annular array; the 4 photoelectric receiving tubes surround the light emitting piece and are distributed in an annular array, and the photoelectric receiving tubes are coincided with the center of the LED lamp array; the connecting line of the two opposite LED lamps and the connecting line of the two opposite photoelectric receiving tubes form an angle of 45 degrees. The centers of the 4 LED lamp arrays are used as the original points of the plane rectangular coordinate system, the connecting lines of the 4 LED lamps and the original points form 90 degrees with each other, and form 45 degrees with the abscissa axis and the ordinate axis. Based on this, 4 photoelectric receiving tubes surround the LED lamp to form an annular array, and the 4 photoelectric receiving tubes are disposed on the coordinate axis.
In the third embodiment, the plurality of light emitting elements are 3 LED lamps, the plurality of light sensing elements are 6 photoelectric receiving tubes, and the 3 LED lamps are distributed in an annular array; the 6 photoelectric receiving tubes surround the light emitting piece and are distributed in an annular array, and the centers of the 6 photoelectric receiving tubes and the LED lamp array coincide.
The method for detecting signals by using the embodiment comprises the steps of enabling the light emitting element and the light sensing element with the same wavelength to form an acquisition group, setting the acquisition groups with different wavelengths, and acquiring a PPG signal of the physiological characteristics of heart rate, blood oxygen or blood sugar of a human body.
Preferably, a 520nm light source is adopted to acquire a heart rate physiological characteristic PPG signal; collecting a blood oxygen physiological characteristic PPG signal by adopting a 650nm light source; and collecting a blood sugar physiological characteristic PPG signal by adopting a 800-950 nm light source.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (7)
1. A surrounding type signal detection structure with a built-in light emitting part of a PPG sensor is characterized by comprising a base plate, a plurality of light emitting parts and a plurality of light sensitive parts, wherein the plurality of light emitting parts and the plurality of light sensitive parts are arranged on the base plate; the light-emitting pieces are distributed in an annular array; the photosensitive pieces surround the luminous pieces and are distributed in an annular array mode, the photosensitive pieces coincide with the centers of the luminous piece arrays, and the photosensitive pieces receive light rays emitted by the luminous pieces.
2. The structure of claim 1, wherein each of the light-emitting members emits light at a different wavelength.
3. The structure of claim 1, wherein each of the light-sensitive members has a filter device for different wavelengths.
4. The structure of claim 1, wherein the light emitter is an LED lamp.
5. The structure of claim 1, wherein the light-sensing element is a photo receiver tube.
6. The structure of claim 1, wherein the plurality of light emitting elements are 4 LED lamps, the plurality of light sensing elements are 4 photo-receiving tubes, and a connection line between two opposite LED lamps and a connection line between two opposite photo-receiving tubes form an angle of 45 degrees.
7. The structure of claim 1, wherein the light emitting elements are 4 LED lamps, the light sensing elements are 8 photo-receivers, and 4 of the 8 photo-receivers are disposed on an extension of a connecting line between two opposing LED lamps.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114376532A (en) * | 2020-10-02 | 2022-04-22 | 柯尼卡美能达株式会社 | Reflection-type photoplethysmography sensor and biological information measuring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114376532A (en) * | 2020-10-02 | 2022-04-22 | 柯尼卡美能达株式会社 | Reflection-type photoplethysmography sensor and biological information measuring device |
| CN114376532B (en) * | 2020-10-02 | 2024-03-15 | 柯尼卡美能达株式会社 | Reflection type photoplethysmography sensor and biological information measuring device |
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Address after: No. 518, unit 1, building 10, poly champagne international, No. 77, Tianmu Road, hi tech Zone (West), Chengdu, Sichuan 610000 Patentee after: Chengdu weikexin Microelectronics Co.,Ltd. Address before: 610000, No. 6, 1, 1, Renhe street, 39 hi tech Zone, Sichuan, Chengdu Patentee before: Chengdu weikexin Microelectronics Co.,Ltd. |