Physiological detection device capable of reducing action artifacts and wearable device

Abstract

A physiological detection device includes a first light source, a second light source, a first light detector, a second light detector, and a processor for detecting a physiological signal through a skin surface. The first light source emits light through an optical element, so that the first light detector and the second light detector receive light energy of different proportions of the first light source. The first light detector and the second light detector receive the same proportion of light energy of the second light source. The processor adjusts the luminous intensity of the first light source according to the intensity difference value of the two light energies received by the first light detector and the second light detector and the intensity change of the light energy received by the first light detector so as to reduce action artifacts in physiological signals.

Description

Technical Field

[0001] The present invention relates to a physiological detection device, and more particularly to an optical physiological detection device which uses a plurality of light sources and a plurality of light detectors of different wavelengths to eliminate motion artifacts, and a wearable device using the optical physiological detection device. Background Art

[0002] Physiological signals detected by optical devices, such as photoplethysmography (PPG) and blood oxygen saturation concentration (SPO2), have gradually found a wide range of applications, such as determining heart rhythm or performing identity recognition. At the same time, since the optical devices used are small in size and low in power consumption, they are easy to be combined with wearable electronic devices.

[0003] However, the wearable electronic device may move relative to the detection skin surface as the user moves, thereby generating motion artifacts in the light detection signal. The noise generated by the motion artifacts may reduce the detection accuracy.

[0004] At present, in order to eliminate the motion artifacts, an accelerometer or gyroscope is additionally configured on the wearable electronic device, which is used to provide relevant information about the user's motion. The motion information is compared with the light detection signal to eliminate the motion signal in the light detection signal. However, in motion or at low temperatures, the use of an accelerometer or gyroscope still cannot effectively eliminate motion artifacts and cannot improve detection accuracy.

[0005] In view of this, the present invention further provides a physiological detection device for reducing motion artifacts in an optical stage and an electronic device using the physiological detection device. Summary of the invention

[0006] The present invention provides an optical physiological detection device using multiple light sources of different wavelengths and multiple light detectors. The multiple light sources include at least two light wavelengths with relatively high and low motion responses, respectively, so as to directly reduce the interference of motion artifacts in the simulation stage.

[0007] The present invention provides an optical physiological detection device suitable for wearable devices and portable devices, which does not need to be equipped with an accelerometer or a gyroscope, thereby reducing system complexity and cost.

[0008] The present invention provides a physiological detection device comprising a first light source, a second light source, a first light detector, a second light detector and a processor. The first light source is used to emit light toward a skin surface through an optical element. The second light source is used to emit light toward the skin surface. The first light detector is used to receive a first intensity light related to the first light source and a second intensity light related to the second light source from the skin surface to generate first detection data. The second light detector is used to receive a third intensity light related to the first light source and a second intensity light related to the second light source from the skin surface to generate second detection data, wherein the optical element makes the third intensity light lower than the first intensity light. The processor is used to adjust the first light intensity of the first light source and fix the second light intensity of the second light source.

[0009] The present invention also provides a physiological detection device comprising a first light source, a second light source, a first light detector and a second light detector. The first light source is used to emit light toward a skin surface. The second light source is used to emit light toward the skin surface. The first light detector is used to receive the outgoing light from the skin surface to generate first detection data. The second light detector is used to receive the outgoing light from the skin surface to generate second detection data. The first light source, the second light source, the first light detector and the second light detector are configured so that the first light detector and the second light detector receive outgoing light of different intensities associated with the first light source, and so that the first light detector and the second light detector receive outgoing light of the same intensity associated with the second light source.

[0010] The present invention also provides an operating method of a wearable device. The wearable device is attached to the surface of the skin and includes an infrared light source, a green light source, a first light detector, a second light detector, and a processor. The operating method includes: lighting the infrared light source and the green light source; detecting the first intensity light of the infrared light source and the second intensity light of the green light source with the first light detector to generate first detection data; detecting the third intensity light of the infrared light source and the second intensity light of the green light source with the second light detector to generate second detection data, wherein the third intensity light is lower than the first intensity light; and adjusting the luminous intensity of the infrared light source according to the intensity difference between the first detection data and the second detection data and the intensity change of the first detection data by the processor.

[0011] In order to make the above and other purposes, features and advantages of the present invention more obvious, the following will be described in detail with reference to the accompanying drawings. In addition, in the description of the present invention, the same components are represented by the same symbols, which are hereby described together. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of the configuration of a light source and a light detector of a physiological detection device according to an embodiment of the present invention relative to a skin surface;

[0013] Figure 2 is a top view of the configuration of a light source and a light detector of a physiological detection device according to an embodiment of the present invention;

[0014] Figure 3 is another top view of the configuration of the light source and the light detector of the physiological detection device according to the embodiment of the present invention;

[0015] Figure 4 is a side view of the configuration of a light source and a light detector of a physiological detection device according to an embodiment of the present invention;

[0016] Figure 5A is a schematic diagram of absolute intensity difference of a physiological detection device according to an embodiment of the present invention;

[0017] Figure 5B and Figure 5C is a schematic diagram of the first detection data of the physiological detection device according to an embodiment of the present invention changing with the adjustment of the brightness of the light source;

[0018] Figure 6 is a detection light signal of the first light detector of the physiological detection device according to the embodiment of the present invention when denoising is not performed by adjusting the brightness of the light source;

[0019] Figure 7 is a detection light signal of the first light detector of the physiological detection device according to an embodiment of the present invention after denoising by adjusting the brightness of the light source; and

[0020] Figure 8 It is a flowchart of the operating method of the wearable device according to an embodiment of the present invention.

[0021] Description of Reference Numerals

[0022] 100 Physiological testing devices

[0023] 15 Processor

[0024] 20 Shell surface

[0025] LED1 first light source

[0026] LED2 Second light source

[0027] PD1 First Photo Detector

[0028] PD2 Second Photo Detector

[0029] S0 Skin surface DETAILED DESCRIPTION

[0030] The object of the present invention is to provide a physiological detection device comprising multiple light sources of different light wavelengths and multiple light detectors. The multiple light wavelengths include at least infrared light and green light, but are not limited thereto. The physiological detection device is used to detect physiological signals through the skin surface, such as photoplethysmographic (PPG) signals and blood oxygen saturation concentration. PPG signals can be used to detect the user's heart rate, respiratory rate, blood pressure, etc., because they are known and are not the main purpose of the present invention, they will not be repeated here. The object of the present invention is to reduce motion artifacts in physiological signals by optical means.

[0031] Please refer to Figure 1 , which is a schematic diagram of the configuration of the light source and the light detector of the physiological detection device 100 relative to the skin surface S0 according to an embodiment of the present invention. The physiological detection device 100 is configured, for example, on a portable electronic device or a wearable electronic device, and there is no specific limitation, as long as the electronic device has a housing surface (e.g. Figures 1 to 4 For example, when the electronic device is a watch or a bracelet, the housing surface 20 is the inner surface of the watch or the bracelet.

[0032] Please also refer to Figure 1 and 2 As shown, Figure 2 FIG. 1 is a top view of the housing surface 20 of the physiological detection device 100 of an embodiment of the present invention, which shows the two-dimensional positional configuration of the components. The physiological detection device 100 includes a first light source LED1, a second light source LED2, a first light detector PD1, a second light detector PD2, an optical element 11, and a processor 15. These components are all arranged below the housing surface 20, and the housing surface 20 preferably has a plurality of windows (for example, see FIG. Figure 4 ) respectively correspond to the first light source LED1, the second light source LED2, the first light detector PD1, and the second light detector PD2 to allow light to enter and exit. In another embodiment, the housing surface 20 has a single window to allow light to pass through and be emitted from the first and second light sources and illuminate the first and second light detectors.

[0033] In one embodiment, the light emitted by the first light source LED1 preferably has a wavelength that is more sensitive to detecting motion artifacts, such as a red light source and / or an infrared light source. The light emitted by the second light source LED2 preferably has a wavelength that is more sensitive to detecting PPG signals but less sensitive to detecting motion artifacts, such as a green light source. In the present invention, the first light source LED1 and the second light source LED2 preferably emit light simultaneously, so that the first light detector PD1 and the second light detector PD2 simultaneously detect the light energy related to the first light source LED1 and the second light source LED2. Figure 1 As shown, the light energy is the reflected light energy from the skin surface S0.

[0034] It must be noted that although the present invention is described by taking a reflective physiological detection device as an example, the present invention is not limited thereto. In other embodiments, the physiological detection device may be a penetrating physiological detection device, and its configuration may refer to U.S. Patent Application No. 17 / 462,622, co-owned by the same assignee of this case, filed on August 31, 2021, entitled “Cardiac Rhythm Detection Device for Reducing Motion Interference”, the entire contents of which are hereby incorporated by reference.

[0035] In one embodiment, the optical element 11 is, for example, a viewing angle control film (VCF) for controlling the penetrating light to have different intensities at different angles (such as incident angle or exit angle), but is not limited thereto. In another embodiment, the optical element 11 may also be a customized lens. In yet another embodiment, the same effect of configuring the optical element 11 may be achieved by directly designing the light-guiding structure of the first light source LED1. That is, the optical element 11 may be an element made separately from the first light source LED1, or an integrally formed structure, without specific limitations.

[0036] The first light source LED1 emits light with a first luminous intensity toward the skin surface S0 through the optical element 11. The second light source LED2 emits light with a second luminous intensity toward the skin surface S0. Since the purpose of configuring the first light source LED1 is mainly to detect motion artifacts, in one embodiment, the first luminous intensity is preferably less than 10% of the second luminous intensity. In one embodiment, the second light source LED2 can emit light through another optical element (such as a lens), but the other optical element does not allocate different light energies to different viewing angles. In another embodiment, according to different spatial configurations, another viewing angle control film (such as VCF2) is configured in the optical path of the second light source LED2, so that the first light detector PD1 and the second light detector PD2 receive approximately the same light intensity through VCF2.

[0037] The first light detector PD1 receives the emitted light ( Figure 1 The first intensity light shown as L1) and the outgoing light associated with the second light source LED2 ( Figure 1 The first detection data Da1 (eg, grayscale value) is generated by using a second intensity light of the outgoing light L1 and the outgoing light L2. That is, the first detection data Da1 is the total response of the outgoing light L1 and the outgoing light L2.

[0038] The second light detector PD2 receives the third intensity light ( Figure 1 The fourth intensity light (shown as L3) and the outgoing light associated with the second light source LED2 Figure 1 L4 is shown, L2 and L4 have substantially the same light intensity) to generate second detection data Da2 (eg, grayscale value). That is, the second detection data Da2 is the total response of the emitted light L3 and L4.

[0039] In the present invention, the optical element 11 makes the third intensity light lower than the first intensity light. In one embodiment, the first intensity light is more than twice the third intensity light, but not limited thereto, as long as the first intensity light is significantly greater than the third intensity light.

[0040] Please refer to Figure 2 As shown, in this embodiment, the optical element 11 is used to allocate different proportions of the light emitted by the first light source LED1 to the first light detector PD1 and the second light detector PD2. The first light source LED1 is arranged on the center line 20 between the first light detector PD1 and the second light detector PD2. CL The second light source LED2 is also arranged at the center line 20 CL The first photodetector PD1 and the second photodetector PD2 are positioned so that the first photodetector PD1 and the second photodetector PD2 receive the same proportion of the emitted light related to the second light source LED2. In this embodiment, VCF2 (if any) allocates the same light intensity to the first photodetector PD1 and the second photodetector PD2.

[0041] The processor 15 is, for example, a microprocessing unit (MCU), an application-specific integrated circuit (ASIC), or a programmable gate array (FPGA), which performs its operations and controls through software, hardware, and / or firmware. For example, the processor 15 is electrically connected to the first light source LED1, the second light source LED2, the first light detector PD1, and the second light detector PD2 to control the light source to emit light and receive detection data (such as grayscale values) from the detector. In one embodiment, the processor 15 adjusts the light intensity of one of the first light source LED1 and the second light source LED2, for example, adjusting the first light intensity of the first light source LED1 and fixing the second light intensity of the second light source LED2, but is not limited thereto.

[0042] For example, the processor 15 determines the adjustment value of the first luminous intensity according to the absolute value |Da1-Da2| of the intensity difference between the first detection data Da1 and the second detection data Da2. As mentioned above, in the example where the second luminous intensity of the second light source LED2 (mainly contributing to the PPG signal) is fixed, the information related to the PPG signal is roughly eliminated by calculating the intensity difference. The size of the intensity difference (i.e., |Da1-Da2|) can reflect the size of the noise (i.e., motion artifacts). In one embodiment, the larger the absolute intensity difference |Da1-Da2|, the larger the adjustment value is selected.

[0043] For example, the processor 15 also determines the adjustment direction of the first luminous intensity according to the intensity change of the first detection data Da1 over time. As mentioned above, since the second luminous intensity of the second light source LED2 is fixed, the intensity change of the first detection data Da1 can be considered to be caused by the change of noise (i.e., motion artifact).

[0044] Please refer to FIG. 5A to FIG. 5C As shown, it shows the operation mode of adjusting the first light source LED1 (displayed as adjustment steps) according to the absolute intensity difference |Da1-Da2| and the intensity change (e.g., slope) of the first detection data Da1. Since the light intensities of the emitted lights L1 and L3 are different, the first detection data Da1 and the second detection data Da2 themselves have a basic intensity difference, for example, displayed as 1Δ. When the absolute intensity difference |Da1-Da2|=1Δ, the processor 15 does not adjust the first light source LED1, that is, the adjustment step is 0.

[0045] FIG. 5A to FIG. 5C In the example, it is assumed that between time t0 and t1, the processor 15 obtains |Da1-Da2|=3Δ and the intensity change of the first detection data Da1 (the difference between the first detection data at t1 and the first detection data at t0) is stronger, indicating that the noise increases the value of the first detection data Da1. At this time, the processor 15 adjusts the first light intensity of the first light source LED1 downward by one step ( Figure 5B The display adjustment step is -1) or the first luminous intensity of the first light source LED1 is adjusted downward by two steps ( Figure 5C The display adjustment step is -2).

[0046] After adjustment, between time t1 and t2, the processor 15 obtains |Da1-Da2|=2Δ and the intensity change of the first detection data Da1 (the difference between the first detection data at t2 and the first detection data at t1) becomes stronger ( Figure 5B ) or weakened ( Figure 5C At this time, the processor 15 adjusts the first luminous intensity of the first light source LED1 downward by one step ( Figure 5B The display adjustment step is -1) or the first luminous intensity of the first light source LED1 is adjusted upward by one step ( Figure 5C The display adjustment step is +1).

[0047] In the present invention, the adjustment step corresponding to the obtained |Da1-Da2| can be set before leaving the factory.

[0048] After adjustment, between time t2 and t3, the processor 15 obtains |Da1-Da2|=1Δ and the intensity change of the first detection data Da1 (calculating the difference between the first detection data at t3 and the first detection data at t2) remains substantially unchanged, and the processor 15 stops adjusting the first luminous intensity of the first light source LED1.

[0049] In one embodiment, between time t2 and t3, when the intensity change of the first detection data Da1 is substantially unchanged, even if |Da1-Da2|>1Δ, the first luminous intensity of the first light source LED1 is not adjusted. In another embodiment, when |Da1-Da2|=1Δ, even if the first detection data Da1 has an intensity change (increase or decrease), the first luminous intensity of the first light source LED1 is not adjusted. In other words, the first luminous intensity of the first light source LED1 is adjusted only when the first detection data Da1 has an intensity change and |Da1-Da2|>1Δ.

[0050] In more detail, when the intensity change of the first detection data Da1 is greater than or equal to the positive threshold (for example, the slope is positive and greater than or equal to the preset threshold), the processor 15 reduces the adjustment value of the first luminous intensity of the first light source LED1, which is determined according to |Da1-Da2|; when the intensity change of the first detection data Da1 is less than or equal to the negative threshold (for example, the slope is negative and less than or equal to the preset threshold), the processor 15 increases the adjustment value of the luminous intensity of the first light source LED1, which is determined according to |Da1-Da2|; when the intensity change of the first detection data Da1 is between the positive threshold and the negative threshold or the intensity change remains unchanged, the processor 15 stops adjusting the first luminous intensity of the first light source LED1, indicating convergence.

[0051] For example, the physiological detection device 100 further includes a storage for pre-recording the adjustment values ​​(such as the above-mentioned steps) of the first light intensity corresponding to different |Da1-Da2| for access by the processor 15 .

[0052] It must be pointed out that FIG. 5A to FIG. 5C The displayed values ​​and changes are for illustration only and are not intended to limit the present invention. During operation, user actions may cause |Da1-Da2| to change randomly.

[0053] In another embodiment, the processor 15 may multiply Da2 by a multiplier RA so that RA×Da2 is approximately equal to Da1 when there is no action, that is, |Da1-RA×Da2|=0. In this way, when an action occurs, |Da1-RA×Da2| will be greater than 0. For example, Figure 5A In other words, in this embodiment, the first light intensity of the first light source LED1 is adjusted only when the first detection data Da1 has intensity variation and |Da1-RA×Da2|>0.

[0054] In the above embodiments, the optical element 11 is configured to make the light intensities of the emitted lights L1 and L3 different, but the present invention is not limited thereto. The present invention can also, through the spatial arrangement of the first light source LED1, the second light source LED2, the first light detector PD1, and the second light detector PD2, make the first light detector PD1 and the second light detector PD2 receive the emitted lights L1 and L3 with different intensities related to the first light source LED1, and make the first light detector PD1 and the second light detector PD2 receive the emitted lights L2 and L4 with the same intensity related to the second light source LED2.

[0055] Please refer to Figure 3 As shown, in one embodiment, the first light source LED1 is arranged to be relatively close to (for example, shown to be on the left side of the center line 20 CL ) the first light detector PD1 and relatively far from the second light detector PD2 (i.e., D1 < D2), so as to achieve the purpose that the light intensity of the emitted light L1 received by the first light detector PD1 related to the first light source LED1 is more than twice that of the emitted light L3 received by the second light detector PD2 related to the first light source LED1. At this time, the light intensity is not distributed by the optical element 11.

[0056] Alternatively, the optical element 11 is still used to finely adjust the light intensity distribution to ensure the predetermined intensity ratio of L1 and L3 received by the first light detector PD1 and the second light detector PD2, so as to compensate for the assembly errors of the first light detector PD1, the second light detector PD2, the first light source LED1, and the second light source LED2.

[0057] Please refer to Figure 4 As shown, in another embodiment, the first light source LED1 is arranged on the center line 20 CL , but the first light detector PD1 is relatively close to the housing surface 20 while the second light detector PD2 is relatively far from the housing surface 20, i.e., VD1 < VD2. At the same time, in order to make the light intensities of the emitted lights L2 and L4 the same, the second light source LED2 is arranged to be relatively close to (for example, shown to be on the right side of the center line 20 CL ) the second light detector PD2 and relatively far from the first light detector PD1. At this time, the light intensity is not distributed by the optical element 11.

[0058] Alternatively, the optical element 11 is still used to finely adjust the light intensity distribution to ensure the predetermined intensity ratio of L1 and L3 received by the first light detector PD1 and the second light detector PD2, so as to compensate for the assembly errors of the first light detector PD1, the second light detector PD2, the first light source LED1, and the second light source LED2.

[0059] The spatial arrangement of the first light source LED1, the second light source LED2, the first light detector PD1, and the second light detector PD2 is not limited to Figure 3 and Figure 4 The configuration of the plurality of light sources and the plurality of light detectors is such that different light detectors receive infrared and / or infrared light of different intensities but receive green light of the same intensity.

[0060] After the first light intensity of the first light source LED1 is adjusted so that the intensity change of the first detection data Da1 converges (ie, substantially unchanged), it indicates that the interference of the motion artifact has been eliminated. Figure 6 It is shown that during the period when the user's skin surface S0 is in motion, a signal of motion artifact will appear in the first detection data Da1; after adjusting the first light intensity of the first light source LED1 (for example FIG. 5A to FIG. 5C As shown), the signal strength of the motion artifact in the first detection data Da1 can be effectively reduced, such as Figure 7 At this time, the processor 15 also generates a photoplethysmographic waveform (PPG) signal based on the first detection data Da1 (after denoising) but not based on the second detection data Da2. The application of the PPG signal depends on different needs and is not specifically limited.

[0061] It must be noted that the above mentioned actions are not limited to the skin surface S0, but also include the activities of tissues (such as muscles, etc.) below the skin surface S0.

[0062] In another implementation, the processor 15 further generates a PPG signal according to a weighted combination of the first detection data Da1 and the second detection data Da2.

[0063] Please refer to Figure 8 As shown, it is a flow chart of the operating method of the physiological detection device 100 of an embodiment of the present invention when applied to a wearable electronic device, comprising the following steps: lighting up the infrared light source LED1 and the green light source LED2 (step S81); detecting the first intensity light of the infrared light source LED1 and the second intensity light of the green light source LED2 with the first light detector PD1 to generate the first detection data Da1 (step S83); detecting the third intensity light of the infrared light source LED1 and the second intensity light of the green light source LED2 with the second light detector PD2 to generate the second detection data Da2, wherein the third intensity light is lower than the first intensity light (step S85); and adjusting the luminous intensity of the infrared light source LED1 according to the intensity difference between the first detection data Da1 and the second detection data Da2 and the intensity change of the first detection data Da1 by the processor 15 (step S87).

[0064] The implementation of the operation method has been described above, for example, with reference to FIG. 5 , and will not be described here in detail. The method of adjusting the light intensity of the light emitting diode is known, such as changing the driving current, and will not be described here in detail. The operation method of the wearable device can also be said to be the operation method of the physiological detection device 100.

[0065] It must be noted that the numerical values ​​in the description of the present invention are only used for illustration and are not used to limit the present invention.

[0066] It must be noted that the infrared light and green light in the description of the present invention are not single wavelengths, but a wavelength range.

[0067] It must be noted that although the above embodiments use light emitting diodes (LEDs) and photodiodes (PDs) to illustrate the light source and the photodetector, the present invention is not limited thereto. In other embodiments, the light source may be an LED and / or a laser diode and the photodetector may be a PD and / or a single photon avalanche diode (SPAD), without any specific limitation.

[0068] In summary, conventional wearable electronic devices use additional accelerometers or gyroscopes to detect user movements, but the denoising effect under motion and low temperature is not ideal. Therefore, the present invention further provides an all-optical physiological detection device (refer to Figures 1 to 4 ) and a method for operating a wearable device (refer to FIG. 5 and Figure 8 ), which determines the intensity adjustment value of the first wavelength light by the intensity difference of the first wavelength light detected by different light detectors, and determines the adjustment direction (increase or decrease) of the first wavelength light by the intensity change of the first wavelength light detected by the same light detector over time, so as to reduce the interference of motion artifacts and improve the accuracy of physiological detection.

[0069] Although the present invention has been disclosed through the above examples, they are not intended to limit the present invention. Any person skilled in the art with ordinary knowledge in the art to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the appended claims.

Claims

1. A physiological detection device, comprising: a first light source, the first light source being used to emit light toward the skin surface through the optical element; a second light source, the second light source being used to emit light toward the skin surface; a first light detector, the first light detector being used to receive the first intensity light associated with the first light source and the second intensity light associated with the second light source from the skin surface to generate first detection data; a second light detector, the second light detector being used to receive a third intensity light associated with the first light source and the second intensity light associated with the second light source from the skin surface to generate second detection data, wherein the optical element makes the third intensity light lower than the first intensity light; as well as A processor is used to adjust a first luminous intensity of the first light source and fix a second luminous intensity of the second light source.

2. The physiological detection device according to claim 1, wherein: The optical element is a viewing angle control film.

3. The physiological detection device according to claim 1, wherein: The first light source is an infrared light source, and The second light source is a green light source.

4. The physiological detection device according to claim 3, wherein: The first light emission intensity is less than 10% of the second light emission intensity.

5. The physiological detection device according to claim 3, wherein: The first intensity light is more than twice the third intensity light.

6. The physiological detection device according to claim 1, wherein: The processor is used to determining an adjustment value of the first light intensity according to an intensity difference between the first detection data and the second detection data, and The adjustment direction of the first light emission intensity is determined according to the intensity change of the first detection data.

7. The physiological detection device according to claim 6, wherein: The processor is used to When the intensity change is greater than or equal to the positive threshold, the adjustment value of the first luminous intensity is reduced, When the intensity change is less than or equal to the negative threshold, the adjustment value of the first luminous intensity is increased, and When the intensity variation is between the positive threshold and the negative threshold, the adjustment of the first light intensity is stopped.

8. The physiological detection device according to claim 1, wherein: The processor is further configured to generate a photovolume variation description waveform based on the first detection data but not based on the second detection data.

9. The physiological detection device according to claim 1, wherein: The first light source and the second light source emit light simultaneously.

10. A physiological detection device, comprising: A first light source, the first light source is used to emit light toward the skin surface; a second light source, the second light source being used to emit light toward the skin surface; a first light detector, the first light detector being used to receive the emitted light from the skin surface to generate first detection data; as well as a second light detector, the second light detector being used to receive the emitted light from the skin surface to generate second detection data, The first light source, the second light source, the first light detector and the second light detector are configured as follows: The first light detector and the second light detector receive the emitted light of different intensities associated with the first light source, and The first light detector and the second light detector receive the emitted light of the second light source with the same intensity.

11. The physiological detection device according to claim 10, wherein: The first light source and the second light source emit light simultaneously.

12. The physiological detection device according to claim 10, wherein: The first light source is an infrared light source, and The second light source is a green light source.

13. The physiological detection device according to claim 12, wherein: A first light emission intensity of the first light source is less than 10% of a second light emission intensity of the second light source.

14. The physiological detection device according to claim 12, wherein: The light intensity of the outgoing light associated with the first light source received by the first light detector is more than twice that of the outgoing light associated with the first light source received by the second light detector. 15 . The physiological detection device according to claim 12 , further comprising a processor for generating a photovolume variation description waveform according to the first detection data but not according to the second detection data.

16. The physiological detection device according to claim 12, further comprising a processor for determining an adjustment value of a first luminous intensity of the first light source according to an intensity difference between the first detection data and the second detection data, and The adjustment direction of the first light emission intensity is determined according to the intensity change of the first detection data.

17. The physiological detection device according to claim 16, wherein: The larger the intensity difference is, the larger the adjustment value is.

18. The physiological detection device according to claim 16, wherein: When the intensity change shows that the first detection data becomes higher, the adjustment direction is to reduce the first luminous intensity, and When the time difference shows that the first detection data becomes lower, the adjustment direction is to increase the first luminous intensity.

19. The physiological detection device according to claim 16, wherein: The processor is further configured to fix a second light emitting intensity of the second light source.

20. A method for operating a wearable device, wherein the wearable device is attached to a skin surface and comprises an infrared light source, a green light source, a first light detector, a second light detector, and a processor, the method comprising: Lighting up the infrared light source and the green light source; Using the first light detector to detect the first intensity light of the infrared light source and the second intensity light of the green light source to generate first detection data; The second light detector detects the third intensity light of the infrared light source and the second intensity light of the green light source to generate second detection data, wherein: The third intensity light is lower than the first intensity light; and The processor adjusts the luminous intensity of the infrared light source according to the intensity difference between the first detection data and the second detection data and the intensity change of the first detection data.

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