WO2019144318A1 - 一种佩戴状态的检测方法及其检测模块、可穿戴设备 - Google Patents

一种佩戴状态的检测方法及其检测模块、可穿戴设备 Download PDF

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Publication number
WO2019144318A1
WO2019144318A1 PCT/CN2018/074009 CN2018074009W WO2019144318A1 WO 2019144318 A1 WO2019144318 A1 WO 2019144318A1 CN 2018074009 W CN2018074009 W CN 2018074009W WO 2019144318 A1 WO2019144318 A1 WO 2019144318A1
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Prior art keywords
wearing state
wearable device
determining
difference
light
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PCT/CN2018/074009
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English (en)
French (fr)
Inventor
段红亮
杨旺旺
白颂荣
刘畅
刘致尧
Original Assignee
深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2018/074009 priority Critical patent/WO2019144318A1/zh
Priority to CN201880000091.5A priority patent/CN108337903B/zh
Priority to EP18880062.7A priority patent/EP3542711A4/en
Priority to US16/426,224 priority patent/US11172884B2/en
Publication of WO2019144318A1 publication Critical patent/WO2019144318A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6844—Monitoring or controlling distance between sensor and tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/684—Indicating the position of the sensor on the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6843—Monitoring or controlling sensor contact pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/20—Detecting, e.g. by using light barriers using multiple transmitters or receivers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
    • A61B2560/02—Operational features
    • A61B2560/0266—Operational features for monitoring or limiting apparatus function
    • A61B2560/0276—Determining malfunction
    • 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
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
    • 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
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6802—Sensor mounted on worn items
    • A61B5/681—Wristwatch-type devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7271—Specific aspects of physiological measurement analysis
    • A61B5/7275—Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor

Definitions

  • the present application relates to the field of smart wearable devices, and in particular, to a method for detecting a wearing state, a detecting module thereof, and a wearable device.
  • the wearing detection technology currently used has the disadvantages of a large probability of misjudgment or a long detection time, and the specific existing methods are as follows:
  • one way is to detect the signal quantity of the reflected light of the LED by adding an LED, and to detect whether to wear by using a simple optical threshold, but this technical error is large, and there is also an optical signal when there is non-skin tissue approaching. Reflection is very easy to cause misjudgment.
  • Another way is to monitor the heart rate signal when the device is worn close to the dense blood vessels in the human body. When the heart rate signal is detected, it is judged to be well worn. This method requires the system to keep working at all times, and the system consumes a large amount of power.
  • the purpose of some embodiments of the present application is to provide a method for detecting a wearing state, a detecting module thereof, and a wearable device, so that the wearing state of the wearing device can be determined more accurately.
  • An embodiment of the present application provides a method for detecting a wearing state, which is applied to a wearable device, where the wearable device includes a light generator and a light receiver; and the detecting method includes: controlling the light generator to emit at least a user Two kinds of optical signals; controlling the light receiver to receive the reflected light corresponding to the at least two kinds of optical signals after being reflected by the user; determining the wearing of the wearable device according to the received trend of the at least two kinds of reflected light status.
  • the embodiment of the present application further provides a wearing state detecting module, which is applied to a wearable device, the detecting module includes a light generator, a light receiver and a processor; and the processor is respectively connected to the light generator And the optical receiver; the processor is configured to control the light generator to transmit at least two optical signals to a user, and the processor is further configured to control the optical receiver to receive the at least two optical signals
  • the processor reflects the reflected light corresponding to the reflected light, and the processor is further configured to determine a wearing state of the wearable device according to a change trend of the at least two types of reflected light received by the optical receiver.
  • the embodiment of the present application further provides a wearable device, including: the detection module as described above.
  • the embodiment of the present application further provides a wearable device, including: at least one processor; and a memory communicably connected to the at least one processor; wherein the memory is stored and executable by the at least one processor An instruction executed by the at least one processor to enable the at least one processor to perform a detection method of a wearing state as described above.
  • the embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and when the computer program is executed by the processor, implements the above-described detection method of the wearing state.
  • the embodiment of the present application utilizes the principle of optical characteristics of human tissue to perform wear detection of the wearable device, and specifically utilizes the change of the distance between the detection module and the skin when worn, in the process of distance change, according to The detection of the change trend of the reflected light corresponding to the received at least two optical signals can determine the wearing condition of the wearable device. It can be seen that since the dynamic detection data detection result is adopted, it is dynamic detection, and the wearing state of the wearable device can be determined more accurately than the existing static detection.
  • At least two of the two light generators emit light signals having different wavelengths.
  • the wear detection results can be confirmed by using different wavelengths of light in different reflectances (transmittances) in the human tissue and the skin surface, and the implementation is simple and accurate.
  • control light generator emits at least two kinds of optical signals, specifically: controlling at least two light generators to emit the at least two optical signals, wherein the at least two illuminating devices are separated from the optical receiver The distance is different.
  • the wear detection result can be confirmed according to different light paths generated by the different distances of the generator and the receiver, and the signal attenuation of each light source after skin reflection and refraction is made, so that the detection is simple and the result is accurate.
  • control light receiver receives the reflected light corresponding to the at least two optical signals after being reflected by the user, specifically: controlling at least two optical receivers to receive the at least two optical signals respectively through the user Corresponding reflected light after reflection.
  • This embodiment uses different optical receivers to receive reflected light of different optical signals, and reduces mutual interference of the received reflected light.
  • control light generator transmits at least two kinds of optical signals to the user, specifically: controlling the light generator to transmit at least two kinds of optical signals to the user according to a preset transmission period.
  • the embodiment defines that the optical signal can be transmitted according to a preset transmission period, without real-time transmission, which can reduce power consumption while avoiding interference between different optical signals.
  • each of the transmission periods is divided into a plurality of transmission phases, and the number of transmission phases included in each of the transmission periods is the same as the number of types of the optical signals; the control light generator is according to a preset transmission period. Transmitting at least two kinds of optical signals to the user, specifically: controlling the light generator to emit an optical signal to the user in each of the transmitting stages according to a preset transmission period.
  • This embodiment further defines a transmission mechanism of the optical signal, and performs time-division transmission and reception on the two optical signals to reduce mutual interference of the optical signals.
  • the step of determining the wearing state of the wearable device according to the change trend of the received at least two kinds of reflected light includes: calculating a difference between the two reflected lights. a value, wherein the difference is a difference between a signal amount of one reflected light and a signal amount of another reflected light; and determining the relationship according to the relationship between the difference and the preset two first signal amount thresholds Wearable state of the wearable device. Further, the comparison of the difference between the signal amount and the threshold is used to determine the wearing state, the detection process is simple, and the detection result is accurate.
  • the step of determining the wearing state of the wearable device according to the change trend of the received at least two types of reflected light includes: determining a difference between the two reflected lights. The relationship between the change trend of the value and the pre-existing change trend, determining the wearing state of the wearable device according to the judgment result of the change trend; or combining all the reflected lights to determine the change trend of the reflected light difference value of each group respectively The relationship of the pre-stored change trend determines the wearing state of the wearable device according to the judgment result of the change trend. Further, the determination method when the optical signal exceeds two types is further limited, so that the determined wearing state is more accurate.
  • the method further includes: determining a relationship between the difference between the two reflected lights and the first signal amount threshold;
  • the determining result of the trend determining the wearing state of the wearable device comprises: determining, according to the determination result of the difference value and the first signal amount threshold relationship, the determination result of the change trend of the difference value Wearable state of the wearable device. The judgment is made by combining the magnitude of the difference and the trend of change, simplifying the judgment process.
  • the wearing state is divided into N levels, the first semaphore threshold has N-1, and the N is a natural number greater than 1.
  • the relationship between the number of preset thresholds and the number of wearing states is defined, so that the setting of the preset threshold is more targeted.
  • the wearing state is divided into three levels, and the higher the number of stages, the better the wearing quality;
  • the two kinds of optical signals are red light and green light, respectively, and the difference is equal to the reflected light corresponding to the green light.
  • the semaphore is subtracted from the signal amount of the reflected light corresponding to the red light, and the preset two first semaphore thresholds are a first threshold and a second threshold, and the first threshold is greater than the second threshold;
  • the step of determining the wearing state of the wearable device according to the relationship between the difference and the preset two first semaphore thresholds, specifically, if the difference is greater than or equal to the first threshold, Further determining a trend of the change of the difference; if the difference is continuously increasing, determining that the wearing state is a three-level wearing state, and if the difference is continuously decreasing or unchanged, returning to determining the difference a relationship between the first threshold and the second threshold; if the difference is greater than the second threshold and smaller than the first threshold, further
  • the pre-stored change trend is characterized by using a pre-stored change trend, wherein the feature curve includes a plurality of feature intervals; and the relationship between the change trend of the difference between the two reflected lights and the pre-existing change trend is determined.
  • the detection curve is drawn according to the difference between the two types of reflected light detected; determining which characteristic interval is pre-stored by the detection curve; and determining the wearing state of the wearable device according to the determination result of the change trend, specifically To: determine the wearing state of the wearable device according to the determination result.
  • the feature curve and the divided feature interval are used to determine the change trend of the reflected light difference value, and the curve can be used to more accurately know the wearing state, and provide a more abundant judgment method.
  • the wearing state is divided into N levels, the N is a natural number greater than 1, and at least one level of wearing state is wearing failure; the detecting method further includes: determining which characteristic interval is pre-stored when determining the detection curve, determining the last Whether the detected difference reaches a preset second semaphore threshold; if not, determining that the wearable state of the wearable device is a wear failure.
  • the wear detection is limited, once the detected difference is lower than a certain threshold, it is determined that the wearing state is a wearing failure, and the wearing detection process is further simplified.
  • the detection curve is drawn, specifically: the detection curve is drawn according to the difference between the two reflected lights detected in the last M detection periods.
  • the detection curve is limited to be drawn based on only a few recent detection data, and the latest data is used to make the determined state closer to the real-time situation on the premise of satisfying the judgment requirement.
  • determining, according to the relationship between the difference and the preset two first semaphore thresholds, determining a wearing state of the wearable device is: Determining, by the relationship between the preset two first semaphore thresholds and the status flag, determining a wearing state of the wearable device; the according to the difference and the preset two first semaphore thresholds After determining the wearing state of the wearable device, the method further includes: updating the status flag according to the determined wearing state. Further, the wearable device is further provided with a status flag indicating the current state of the wearable device, and the joint judgment is performed in conjunction with the current state at the time of the determination, so that the judgment result is more accurate.
  • the wearable device further includes an acceleration sensor; before the control light receiver receives the reflected light corresponding to the at least two kinds of optical signals reflected by the user, the method further includes: controlling the acceleration sensor to detect an acceleration change; Determining, according to the change trend of the received at least two types of reflected light, the wearing state of the wearable device, specifically: determining, according to a change trend of the received at least two kinds of reflected light and an acceleration change detected by the acceleration sensor The wearing state of the wearable device.
  • the acceleration sensor is added, and the optical signal detection is combined to make the detection result more accurate.
  • the method further includes: detecting a heart rate signal; and the changing trend according to the received at least two reflected lights Determining a wearing state of the wearable device, specifically: determining a wearing state of the wearable device according to a received trend of at least two reflected lights and a detection result of the heart rate signal.
  • the heart rate signal detection is further increased, and the optical signal detection result is further determined, so that the obtained detection result of the wearing state is accurate.
  • the detectable module further includes an optical isolation assembly coupled to the light generator.
  • the optical isolation component is added, and the shape of the light generated by the light generator can be limited to prevent a large amount of light leakage when the optical structure is in close contact with the skin, thereby affecting the wearing detection effect.
  • FIG. 1 is a schematic diagram of a detecting module according to a first embodiment of the present application.
  • FIG. 2 is a flowchart of a method for detecting a wearing state according to the first embodiment of the present application
  • FIG. 3 is a schematic diagram showing changes in reflected light detected by two optical signals in the first embodiment of the present application
  • FIG. 4 is a circuit diagram of a detection module in a first embodiment of the present application.
  • FIG. 5 is a schematic diagram of a detecting module according to a second embodiment of the present application.
  • FIG. 6 is a circuit diagram of a detecting module in a second embodiment of the present application.
  • FIG. 7 is a timing chart of operations in a method of detecting a wearing state in a second embodiment of the present application.
  • FIG. 8 is a schematic diagram of a detecting module according to a third embodiment of the present application.
  • FIG. 9 is a flowchart of a method for detecting a wearing state in a third embodiment of the present application.
  • FIG. 10 is a circuit diagram of a detecting module in a third embodiment of the present application.
  • FIG. 11 is a flowchart of a method for detecting a wearing state according to a fourth embodiment of the present application.
  • FIG. 12 is a flowchart of a method for detecting a wearing state according to a fifth embodiment of the present application.
  • FIG. 13a is a schematic diagram of a detection curve in a method for detecting a wearing state according to a fifth embodiment of the present application.
  • FIG. 13b is a schematic diagram of a characteristic curve in a method for detecting a wearing state according to a fifth embodiment of the present application.
  • FIG. 14 is an operation timing chart in a method of detecting a wearing state in a sixth embodiment of the present application.
  • FIG. 15 is a schematic diagram of a detection module according to an eighth embodiment of the present application.
  • Figure 16 is a schematic illustration of a wearable device in accordance with an eleventh embodiment of the present application.
  • the first embodiment of the present application relates to a method of detecting a wearing state.
  • the wearable device includes two light generators (LED 113 and LED 114, respectively) and one light receiver (hereinafter simply referred to as "PD") 115.
  • the wearable device in this embodiment further includes an optical isolation component 111 and a carrier 112.
  • the optical isolation component 111 is mainly used to isolate the LED light; the carrier 112 is mainly used for carrying and fixing the LED 113, the LED 114, the PD 115, and the optical isolation component 111.
  • Step 201 controlling the light generator to emit two kinds of optical signals to the user.
  • the user may be a person who uses the wearable device, that is, a person who wears the wearable device on the body. In this embodiment, it is required to detect the wearing state of the wearable device relative to the person.
  • the optical signals emitted by the two light generators have different wavelengths, and the green light signals (such as 525 nm) are respectively emitted by the LEDs 113, and the red light signals (such as 631 nm) are emitted by the LEDs 114.
  • the optical isolation assembly 111 is primarily used to control the shape of the beam of light emitted by the light generator.
  • an optical isolator can be used.
  • the optical isolator is a passive optical device that only allows unidirectional light to pass through. The working principle is based on the non-reciprocity of Faraday rotation, and the light reflected by the optical fiber echo can be Optical isolators are well isolated.
  • An optical isolator is a passive device that allows light to pass in one direction and prevents it from passing in the opposite direction.
  • the function is to limit the direction of light so that light can only be transmitted in one direction, and light reflected by the fiber echo can be used by the optical isolator. Very good isolation, improve light wave transmission efficiency. In the present embodiment, it is possible to prevent a large amount of light leakage when the optical structure is in close contact with the skin, thereby affecting the wearing detection effect.
  • Step 202 controlling the light receiver to receive the reflected light.
  • the control light receiver receives the reflected light corresponding to the two kinds of optical signals after being reflected by the user. More specifically, the red light signal and the green light signal are received by the PD. More specifically, in an actual application, the optical receiver may be configured to receive optical signals according to a preset detection period according to a preset detection period, and the optical receivers respectively receive optical signals from the two optical transmitters.
  • the detection period can be 100 microseconds.
  • Step 203 Determine a wearing state of the wearable device according to the received trend of the two reflected lights.
  • the wearing state of the wearable device is determined according to the difference between the received signal amount of the reflected light corresponding to the two kinds of optical signals and the preset two first signal amount thresholds.
  • the wearing state is divided into N levels, and the first signal amount threshold has N-1, and the N is a natural number greater than 1. More specifically, the wearing state is divided into three levels, and the higher the number of stages, the better the wearing quality; the two kinds of light signals are red light and green light, respectively, and the difference is the signal amount of the reflected light corresponding to the green light minus red.
  • the difference between the semaphores of the reflected light corresponding to the light, the preset two first semaphore thresholds are a first threshold and a second threshold, and the first threshold is greater than the second threshold; according to the difference and the preset two first
  • the step of determining the wearing state of the wearable device the method further includes: if the difference is greater than or equal to the first threshold, further determining a trend of the difference; if the difference is constant If it is increased, determining that the wearing state is a three-level wearing state, and if the difference is continuously decreasing or unchanged, returning to determine a relationship between the difference and the first threshold; if the difference is greater than Determining a change trend of the difference value when the second threshold is less than the first threshold; if the difference is constant or decreasing, determining that the wearing state is a second-level wearing state, if the difference is As the value continues to increase, return to determine the difference and Describe the relationship of the second threshold; if the difference is less than or equal to the second threshold, determine that
  • the three wearing states can be: falling off (first-level wearing state), wearing well (three-level wearing state), and wearing (second-level wearing state), and the two kinds of light signals are red light and green light, respectively.
  • the two first semaphore thresholds can be set by simulation or by the experience of the technician. When comparing the semaphore change of the reflected light corresponding to the two optical signals with the preset two first semaphore thresholds, the specific method is as follows:
  • the signal amount of the green light is subtracted from the signal amount of the red light to obtain the difference S.
  • the relationship between the difference S and the preset first threshold A1 and the second threshold A2 is compared, wherein A1 is greater than A2.
  • S ⁇ A1 further determine the trend of S. If S increases continuously, it determines that the wearing state is good. If S decreases or does not change, it returns to judge the relationship between S and A1; when A1>S>A2, Further, the change trend of S is further determined. If S is constant or decreased, it is determined that the wearing state is wearing, and if S is continuously increasing, the relationship between S and A2 is judged; when S ⁇ A2, the wearing state is determined to be falling off. .
  • the inventors of the present invention have found that since the optical characteristics of the human body and the green light are different, the absorption rate and the reflectance of the optical signals of the two wavelengths are different. Therefore, according to the received value of the PD, it can be determined whether the wearable device is being Close to the human body or away from the human body, the inventors of the present invention detect the red light signal and the green light signal, and classify the results according to gradually moving away and gradually approaching, and the obtained data feature map is as shown in FIG. It is worth mentioning that the trend of reflected light can be characterized by the following parameters: the intensity of light, the brightness of light or the illuminance of light. In practical applications, the above parameters may be used alternatively or in combination, and are not limited herein.
  • the curve 301 is a semaphore curve of the reflected light corresponding to the green light
  • the curve 302 is a semaphore curve of the reflected light corresponding to the red light, which is compared between the wearable device and the human body.
  • the pitch is dynamically changed (ie, during the detection process)
  • the curvature and peak appearance positions of the two are significantly different. Therefore, the wearable device and the human body can be determined according to whether the curvature changes of the two optical signals during the detection process are consistent. Whether the spacing between them is close to or far from.
  • the wavelength difference of the optical signals emitted by the LEDs is about 106 nm, and the difference between the wavelengths of the two LEDs used in practical applications may be other values, such as greater than or equal to 50nm. It should be noted here that the larger the wavelength difference, the more accurate the detection result will be.
  • step 203 specifically includes: calculating a difference between the two reflected lights, wherein the difference is a difference between the signal amount of one reflected light and the signal amount of the other reflected light; The relationship between the value and the preset two first semaphore thresholds determines the wearing state of the wearable device.
  • the wearable device in this embodiment may be different due to the optical structure and the brightness of the red LED and the green LED.
  • the absolute values of the red LED and the green LED are different, thereby causing the difference between the two.
  • the structure and brightness of the red LED and the green LED are fixed, the distance between the wearable device and the skin can be determined according to the received reflected light corresponding to the two LEDs, thereby determining the fit of the wearable device to the skin.
  • the wearing and falling detection of the wearable device can be determined according to the trend of the two.
  • steps 201 to 203 is to detect the wearing state when the semaphore threshold is used when a red LED and a green LED are used.
  • an optical signal generator that emits other wavelengths may also be used, and adjusted according to actual conditions.
  • the semaphore threshold is detected by wearing the state.
  • the circuit module (hereinafter referred to as "detection module”) in the wearable device in the present embodiment can be as shown in FIG. 4 , and specifically includes an MCU module 121 and an integrator module INT module. 122.
  • the MCU module 121 is used as a central processing unit, and is mainly used for data processing and control of the INT module 122, the DRV1 module 124, and the DRV2 module 123.
  • the INT module 122 is used to control the optical receiver PD115.
  • the DRV1 module 124 is used to control the red LED 114, specifically controlling the brightness and illumination time of the LED 114.
  • the DRV2 module 123 is used to control the green LED 113, specifically controlling the brightness and lighting time of the LED 113.
  • the MCU control module 121 indirectly controls the red LED 114 and the green LED 113 by controlling the DRV1 module 124 and the DRV2 module 123.
  • the MCU control module 121 acquires the optical signal received by the PD 115 through the INT module 122.
  • the present embodiment uses the optical characteristic principle of human tissue to detect the wear condition of the wearable device.
  • the absorption rate and the reflectance of the human body to different light are different, so the same distance
  • the reflected light of different kinds of optical signals will be different in signal strength, and when the distance changes, each optical signal will separately produce a change in signal strength, also due to the absorption rate of different kinds of light by human tissue.
  • the reflected light corresponding to different optical signals will have different trends of strength and weakness.
  • the trend of the signal has more stable characteristics and is less susceptible to external interference. According to the detection of this principle, the obtained test results are also more accurate.
  • the present embodiment specifically utilizes a change in the distance between the wearable device and the skin when worn, and can detect the change trend of the reflected light corresponding to the received at least two optical signals during the change of the distance.
  • Wearable wearables It can be seen that since the dynamic detection data detection result is adopted, it is dynamic detection, and the wearing state of the wearable device can be determined more accurately than the existing static detection.
  • it is further defined as two kinds of optical signals and three wearing states, and also defines a wearing rule of the wearing state, so that when comparing red light and green light, the determination rule of each state is clear and simple.
  • the number of the light generators may be different in actual applications, such as one, three, four, etc., and at the same time, one in the embodiment.
  • the optical receiver can be more in practical applications, and is not limited herein.
  • the number of optical signals in the present embodiment is two, and the wearing state is determined according to the changing trend of the difference of the reflected light corresponding to the two optical signals, and in actual applications, a larger number of optical signals can be used for judging.
  • the relationship between the change trend of the difference between the two reflected lights and the pre-existing change trend may be determined, and the wearing state of the wearable device may be determined according to the judgment result of the change trend; or, all the reflected light may be Combining, respectively determining the relationship between the change trend of the reflected light difference value of each group and the pre-existing change trend, and determining the wearing state of the wearable device according to the determination result of the change trend.
  • the second embodiment of the present application relates to a method of detecting a wearing state.
  • the present embodiment is similar to the first embodiment, and the main difference is that the wavelengths of the optical signals emitted by the two light generators in the first embodiment are different, and in the present embodiment, the two light generators are separated from the optical receiver. The distance is different.
  • the structure of the detecting module in the wearable device in this embodiment is as shown in FIG. 5 , and specifically includes: an optical isolating component 211 , a carrier 212 , an LED 213 , an LED 214 , and a PD 215 .
  • the optical isolation component 211 is mainly used for isolating the LED light;
  • the carrier 212 is mainly used for carrying and fixing the LED 213, the LED 214, the PD 215, and the optical isolation component 211;
  • the PD 215 is used as an optical receiver for receiving the optical signal.
  • the circuit frame adopted by the same wavelength wearing detection scheme is shown in FIG. 6.
  • the circuit mainly includes an MCU module 221, an INT module 222, a DRV1 module 224, a DRV2 module 223, and a red LED 214, a red LED 213, and a PD 215.
  • the MCU module 221 is mainly used as a central processing unit, mainly for data processing and control of the INT module 222, the DRV1 module, and the DRV2 module.
  • the INT module 222 is used to control the optical receiver PD215.
  • the DRV1 module 224 is used to control the red LED 214, specifically for controlling the brightness and illumination time of the LED 214.
  • the DRV2 module 223 is used to control the red LED 213, specifically for controlling the brightness and illumination time of the LED 213.
  • the MCU control module 221 indirectly controls the red LED 214 and the red LED 213 by controlling the DRV1 module 224 and the DRV2 module 223.
  • the MCU control module 221 acquires the optical signal received by the PD 215 through the INT module 222.
  • two red LEDs are used as the light generators (LEDs 213 and 214, respectively), but the distance between the two LEDs and the PD215 is different, and the LED 213 can be seen from FIG.
  • the distance of the PD215 is closer. It can be seen that since the distances of the LED 213, the LED 214 and the PD 215 are different, when the distance between the human skin tissue and the wearable device changes, the propagation path of the light emitted by the two changes, and the variation trend of the reflected light received by the PD 215 is also different. The distance between the wearable device and the skin can be determined based on the two reflected lights received.
  • the wearable device is used as a basis for judging the state in which the wearable device is attached to the skin.
  • the trend of the distance between the wearable device and the skin can be judged according to the trend of the light signal of the two, so that the dynamic detection of wearing and falling off can be made.
  • a method for time-sharing detection may be used. Specifically, one detection period is divided into several transmission phases, and the number of transmission phases included in each transmission period is the same as the number of optical signals.
  • the control light generator transmits at least two kinds of optical signals to the user according to a preset transmission period, specifically: the control light generator emits an optical signal to the user in each transmission phase according to a preset transmission period.
  • FIG. 7 shows a period T of system operation, and in one working period T1, two stages t1 and t2 are divided.
  • the red LED 213 emits light and the red LED 214 does not emit light.
  • the red LED 213 does not emit light, and the red LED 214 emits light.
  • the PD 215 is always in the working state, that is, in the t1 phase, the optical signal of the red LED 213 is received, and in the t2 phase, the optical signal of the red LED 214 is received. Thereafter, the PD 215 transmits the received optical signal to the MCU module 221 for processing.
  • t1 and t2 can be half a cycle, that is, 1/2T1, that is, if T1 is 100 microseconds, t1 and t2 can be 50 microseconds, respectively.
  • the distance between the light generator and the light receiver is different, so that the change trend of the received light is different, thereby realizing the detection of the wearing condition of the wearable device.
  • the present embodiment provides a method different from the first embodiment to implement the wear condition detection of the wearable device, so that the present invention has a variety of application scenarios, and the implementation in the actual application may select different implementation manners according to actual conditions.
  • the method of time sharing operation is superimposed, and the two light generators are set to different working timings, so that the two optical signals do not interfere with each other, thereby reducing false positives.
  • the technical solution mentioned in the first embodiment and the technical solution mentioned in the embodiment may be combined at the same time, that is, the two LEDs used are not only different in wavelength. And the distance from the light receiver is also different.
  • the third embodiment of the present application relates to a method of detecting a wearing state.
  • This embodiment is similar to the first embodiment, and the main difference is that one optical receiver is used in the first embodiment, and two optical receivers are used in the present embodiment.
  • the detection module in this embodiment may be as shown in FIG. 8 , and specifically includes: an optical isolation component 311 , a carrier 312 , a red LED 313 , a green LED 315 , a PD 314 , and a PD 316 .
  • the optical isolation component 311 is mainly used for isolating the LED light;
  • the carrier 312 is mainly used to carry the fixed red LED 313, the green LED 315, the PD314, the PD 316, and the optical isolation component 311;
  • the red LED 313 and the green LED 315 are used as a light generator for generating red light and Green light;
  • PD314 and PD316 act as optical receivers.
  • the method for detecting the wearing state in this embodiment is as shown in FIG. 9 , and the details are as follows:
  • Step 901 in this embodiment is similar to step 201 in the first embodiment, and details are not described herein again.
  • Step 902 Control two optical receivers to respectively receive reflected light corresponding to the two optical signals after being reflected by the user.
  • different optical receivers receive different optical signals.
  • the PD 314 is only sensitive to red light, and therefore only receives the red light signal
  • the PD 316 is only sensitive to green light, and thus only receives the green light signal.
  • Step 903 in this embodiment is similar to step 203 in the first embodiment, and details are not described herein again.
  • the circuit of the detection module in this embodiment may be as shown in FIG. 10, and mainly includes an MCU module 321, an INT1 module 324, an INT2 module 326, a DRV1 module 323, a DRV2 module 325, and a red LED 313, a green LED 315, a PD 314, and a PD 316.
  • the MCU module 321 is mainly used as a central processing unit, mainly for data processing and control of the INT1 module 324, the INT2 module 326, the DRV1 module 323, and the DRV2 module 325.
  • the INT1 module 324 is used to control the optical receiver PD 314 and the INT2 module 326 for controlling the optical receiver PD 316.
  • the DRV1 module 323 is used to control the red LED 313, specifically for controlling the brightness and illumination time of the LED 214.
  • the DRV2 module 325 is used to control the green LED 315, specifically for controlling the brightness and illumination time of the LED 315.
  • the MCU control module 321 indirectly controls the red LED 313 and the green LED 315 by controlling the DRV1 module 323 and the DRV2 module 325.
  • the MCU control module 321 acquires the red light signal received by the PD 314 through the INT1 module 324, and the MCU control module 321 acquires the green light signal received by the PD 316 through the INT2 module 326.
  • the optical signals received by the PD 314 and the PD 316 are different, and the difference between the two can be Judging the distance between the detection module and the skin, indirectly determining the wearing situation.
  • the propagation path of the light emitted by the two changes.
  • the distance between the detection module and the skin can be determined according to the received amount of the two light signals. Therefore, it serves as a basis for judging the state in which the detection module is attached to the skin.
  • the amount of the light signal of the two is changed, the trend of the distance between the detection module and the skin can be judged according to the change trend of the light signal amount of the two, so that the dynamic detection of wearing and falling off can be made.
  • optical receivers are used in the embodiment, a larger number of optical receivers can be used in practical applications, especially when the number of light generators is larger, that is, a larger amount of light can be used.
  • the receiver for example, is provided with a light receiver for each of the light generators, so the specific number of the light receivers is not limited herein.
  • the fourth embodiment of the present application relates to a method of detecting a wearing state.
  • the present embodiment is further improved on the basis of the first embodiment, and the main improvement is that the acceleration sensor (ie, Gsensor) is added in the embodiment, and the signal amount received by the optical receiver is combined and judged, so that The test results are more accurate.
  • the acceleration sensor ie, Gsensor
  • the method for detecting the wearing state in the present embodiment is as shown in FIG. 11 , and is specifically as follows:
  • Steps 1101 and 1102 in this embodiment are similar to steps 201 and 202 in the first embodiment, and are not described herein again.
  • Step 1103 When the received trend of the two reflected lights meets the preset condition, the acceleration sensor is controlled to detect the acceleration change.
  • the preset condition may be a change trend of the two reflected lights when the wearing state is wearing or wearing well, and may be specifically set by a technician according to simulation data or according to experience.
  • Step 1104 Determine a wearing state of the wearable device according to the acceleration change.
  • the inventors of the present invention have found that since there is a certain acceleration change when the wear is good, when the semaphore change satisfies the preset condition, the acceleration change is further determined, and it is possible to more accurately determine whether or not the wear is good. Reduce the rate of false positives. That is to say, the wearing state of the wearable device can be determined according to the change trend of the received two kinds of reflected light and the acceleration change detected by the acceleration sensor.
  • the change tendency of the reflected light is determined as the advance, and in the actual application, the acceleration sensor may be used for the advance determination or both.
  • the detection of the Gsensor is increased, so that the detection result is obtained.
  • the accuracy is greatly improved.
  • G sensor is detected first, and Gsensor is detected.
  • Gsensor detection may be used as an advance determination, and the acceleration change detected by Gsensor satisfies the preset. When the condition is met, the detection of the change trend of the reflected light is started.
  • the acceleration sensor is combined with the detection of the change trend of the reflected light.
  • the heart rate signal can be detected by the PPG (photoelectric volume map), and the detected heart rate signal is combined with the detection of the change trend of the reflected light, thereby The determination of the wearing state is performed. Since the wearable device is close to the human tissue after being properly worn, physiological signals such as heart rate, blood pressure, and blood oxygen can be detected. Therefore, the combined detection using PPG can also greatly improve the accuracy of the detection result. For example, firstly, the detection trend of the reflected light is performed. If the detection result is good wearing, the PPG detection is further adopted.
  • the output detection result is well worn, and the false positive rate can be effectively reduced.
  • the detection result is other wearing states such as not wearing, the heart rate detection function does not need to be activated, the running time of the heart rate detection is reduced, and the power consumption of the detection module is effectively reduced.
  • the detection of the acceleration change and the heart rate detection result can be combined with the detection of the change trend of the reflected light to further improve the accuracy of the detection result.
  • a fifth embodiment of the present application relates to a method of detecting a wearing state.
  • the present embodiment is similar to the first embodiment, and the main difference is that in the first embodiment, the wearing state of the difference is determined according to the comparison result of the reflected light difference value and the specific threshold value, and the wearing state is determined.
  • a certain feature interval of the pre-stored characteristic curve to which the curve formed by the difference belongs is used to determine the wearing state. Since the curve is more likely to retain the details of the trend change, it is more accurate to use the curve comparison to determine the wearing state.
  • Steps 1201 and 1202 in this embodiment are similar to steps 201 and 202 in the first embodiment, and are not described herein again.
  • Step 1203 Draw a detection curve according to the difference between the two detected reflected lights.
  • the detection curve can be drawn according to the difference between the two types of reflected light detected in the last 100 detection periods. A difference is obtained for each detection cycle, and then the data can be fitted to the curve based on the last 100 differences to obtain a detection curve.
  • a schematic diagram of the detection curve is shown in FIG. 13a.
  • curve 301 is a semaphore curve of reflected light corresponding to green light
  • curve 302 is a semaphore curve of reflected light corresponding to red light
  • curve 303 is a green light corresponding to detection curve. The reflected light is subtracted from the semaphore curve of the reflected light corresponding to the red light.
  • step 1204 the detection curve and the characteristic curve are compared.
  • the detection curve is the detection curve obtained in step 1203, and the characteristic curve may be drawn by the designer according to the wavelength of the used optical signal, and the characteristic curve may include several characteristic intervals, and the embodiment may be configured as shown in the figure.
  • the characteristic curve and the characteristic curve division manner shown in 13b wherein t0-t1 is divided into feature interval T1 according to chronological order, t0-t3 is divided into feature interval T2, and t2-t4 is divided into feature interval T3, t4 to division It is the feature interval T4.
  • the curve can be matched (or other methods) for matching.
  • the configuration index is represented by the squared R value of the fitting degree (other indicators can also be used), for example, the value of R is 0.8 (value) Can be other, not limited).
  • a matching parameter X may be added, and X represents a portion where the detection curve and the pre-stored curve are successfully fitted.
  • t0 ⁇ tx tx is between t1 and t2
  • t0 ⁇ t1 part accounts for 60% of the whole T2 (corresponding to X is 0.6)
  • t0 ⁇ The t2 part accounts for 80% of the whole T2 (corresponding to X is 0.8).
  • the detection curve can be successfully matched with t0 ⁇ tx (tx is between t1 and t2) (the R square is greater than 0.8)
  • the X value is between 0.6 and Between 0.8.
  • Step 1205 Determine, according to the comparison result, which feature interval the pre-stored detection curve belongs to.
  • each characteristic curve can be compared one by one according to the time sequence of the characteristic curve.
  • the detection curve is first compared with the curve in the T1 interval.
  • the comparison result reaches 0.8
  • the determination belongs to the characteristic interval T1; when the deviation is not reached, the comparison is continued, and the detection curve can be deformed first. Then, it is compared with the characteristic curve of the T1 interval. If it is not reached after a certain period of time, it is determined that the wearing fails, and the step of drawing the detection curve is returned. In this stage, once it is determined that it belongs to the feature interval T1, it continues to be compared with the feature interval T2.
  • the comparison method of the feature interval T2 is similar to the comparison method of the feature interval T1. It should be noted that, after a certain period of time, If the upper feature interval T2 cannot be matched, then the return is re-aligned with the feature interval T1.
  • the above-mentioned curve deformation can stretch or compress the drawn detection curve in the transverse direction, remove the difference in the wearing speed that the user may use, or partially stretch or compress the detection curve. Such a stretched or compressed curve will be easier to match the characteristic curve.
  • the detection curve of the new detection data will continue to be drawn, and at the same time, the detection curve at this time is compared with the characteristic curve in the T3 interval, and the determination here can be continued. Judgment, no limit on time. After it is determined that it belongs to the T3 interval, it is further compared with the T4 interval. After it is determined that it belongs to the T4 interval, the curve drawn later will be compared with the T1 curve again, and so on.
  • Step 1206 determining a wearing state of the wearable device according to the determination result.
  • the determination result belongs to the feature interval T1
  • the determination result belongs to the feature interval T2 it is determined that the wearing state is “wearing good”
  • the determination result belongs to the feature interval T3 It is determined that the wearing state is "gradually away”
  • the determination result belongs to the feature section T4 it is determined that the wearing state is "wearing failure”.
  • the present embodiment defines the feature curve and the divided feature interval to determine the change trend of the reflected light difference value, and can use the curve to more accurately know the wearing state, and provide a more abundant judgment method.
  • the present embodiment does not set a time limit in the T3 interval determination, which is more in line with the actual application scenario, so that the determination result is more accurate.
  • the sixth embodiment of the present application relates to a method of detecting a wearing state.
  • the present embodiment is further improved in the first embodiment, and the main improvement is that the transmission period is divided into two transmission phases, and an optical signal is transmitted to the user in each transmission phase. Different types of optical signals are used in a time-sharing mechanism to reduce optical signal interference during reception.
  • each transmission period is divided into a plurality of transmission phases, and the number of transmission phases included in each transmission period is the same as the number of types of optical signals; and the control light generator is configured according to a preset emission.
  • the control light generator emits an optical signal to the user in each transmission phase according to a preset transmission period.
  • FIG. 14 shows a period T2 of system operation.
  • two stages t3 and t4, t3 and green LED ie, green light
  • generator 4 corresponds to red LED (ie red light generator). Therefore, at the t3 stage, the green LED illuminates and the red LED does not illuminate.
  • the t4 phase the green LED does not emit light, and the red LED emits light.
  • the optical receiver is always in the working state, that is, in the t3 phase, the optical signal of the green LED is received, and in the t4 phase, the optical signal of the red LED is received. Thereafter, the optical signal received by the PD is processed.
  • the time-divisional optical signal is used, so that the two optical signals do not cause interference, so that the detection result is more accurate.
  • the seventh embodiment of the present application also relates to a method of detecting a wearing state.
  • This embodiment is further improved than the first embodiment.
  • the main improvement is that a new state flag is added, and the joint judgment of the state flag and the optical signal amount is utilized, so that the determination result is more accurate.
  • the status flag is updated each time the wearing status is determined. Determining the wearable according to the relationship between the difference value and the preset two first semaphore thresholds and the status flag when determining the wearing state of the wearable device according to the relationship between the difference and the preset two first semaphore thresholds The wearing status of the device.
  • the wearing state when the wearing state is being worn, it can be further divided into gradually approaching and gradually moving away, and when the state flag is clearly defined, the state of being worn can be further subdivided according to the trend of light change. If the status is marked as being worn well, combined with the characteristics that the amount of optical signal is continuously reduced, it can be determined that the wearing state is gradually away; if the state is marked as falling off, the characteristics of the optical signal are continuously increased, and the wearing state is gradually determined. near.
  • the detecting method in the embodiment further includes: presetting a status flag for the wearable device; determining, according to the relationship between the difference and the preset two first semaphore thresholds, determining a wearing state of the wearable device: The wearing state of the wearable device is determined according to the relationship between the difference and the preset two first semaphore thresholds and the status flag.
  • the method further includes: updating the status flag according to the determined wearing state.
  • the embodiment further defines that the wearable device is further provided with a status flag indicating the current state of the wearable device, and the joint determination is performed in conjunction with the current state at the time of the determination, so that the determination result of the wearing state is more accurate.
  • the eighth embodiment of the present application relates to a detection module.
  • the detection module in this embodiment is applied to a wearable device, and the detection module can include two light generators (LEDs 413 and 414), one optical receiver (PD415), and a processor (ie, MCU) as shown in FIG.
  • the processor is configured to control the light generator to emit two kinds of optical signals to the user, and the processor is further configured to control the light receiver to receive the reflected light corresponding to the two kinds of optical signals after being reflected by the user, and the processor is further configured to receive the received light according to the optical receiver.
  • the trend of the two reflected light changes determines the wearing state of the wearable device.
  • the tendency of the reflected light in the present embodiment can be characterized by the following parameters: the intensity of light, the brightness of light, or the illuminance of light. More specifically, one of the above parameters may be utilized, or multiple combinations of the above parameters may be utilized.
  • the detection module in this embodiment further includes: an optical isolation component 411 and a carrier 412.
  • the optical isolation component 411 is mainly used to isolate the LED light;
  • the carrier 412 is mainly used to carry and fix the LED 413, the LED 414, the PD 415, and the optical isolation component 411.
  • the present embodiment is an apparatus embodiment corresponding to the first embodiment, and the present embodiment can be implemented in cooperation with the first embodiment.
  • the related technical details mentioned in the first embodiment are still effective in the present embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related art details mentioned in the present embodiment can also be applied to the first embodiment.
  • the ninth embodiment of the present application relates to a detection module.
  • the present embodiment is a further improvement based on the sixth embodiment.
  • the main improvement is that the detection module further includes an acceleration sensor connected to the processor; the processor is further configured to receive at least two reflections according to the received The change trend of the light and the value detected by the acceleration sensor determine the wearing state of the wearable device.
  • This embodiment is an apparatus embodiment corresponding to the fourth embodiment, and the present embodiment can be implemented in cooperation with the fourth embodiment.
  • the related technical details mentioned in the fourth embodiment are still effective in the present embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related art details mentioned in the present embodiment can also be applied to the fourth embodiment.
  • a tenth embodiment of the present application relates to a wearable device, comprising: a detection module as mentioned in the eighth embodiment or the ninth embodiment.
  • the eleventh embodiment of the present application also relates to a wearable device, as shown in FIG. 16, comprising:
  • At least one processor and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform A method of detecting a wearing state as referred to in any one of the seventh to seventh embodiments.
  • the memory and the processor are connected in a bus manner, and the bus may include any number of interconnected buses and bridges that connect the various circuits of one or more processors and memories.
  • the bus can also connect various other circuits, such as peripherals, voltage regulators, and power management circuits, as is well known in the art, and therefore, will not be further described herein.
  • the bus interface provides an interface between the bus and the transceiver.
  • the transceiver can be an element or a plurality of elements, such as multiple receivers and transmitters, providing means for communicating with various other devices on a transmission medium.
  • the data processed by the processor is transmitted over the wireless medium via an antenna. Further, the antenna also receives the data and transmits the data to the processor.
  • the processor is responsible for managing the bus and normal processing, as well as providing various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the memory can be used to store data used by the processor when performing operations.
  • a twelfth embodiment of the present application relates to a computer readable storage medium storing a computer program that, when executed by a processor, implements a method of detecting a wearing state of any one of the first to seventh embodiments.
  • a program instructing related hardware can be completed by a program instructing related hardware, and the program is stored in a storage medium, and includes a plurality of instructions for making a device ( It may be a microcontroller, a chip, etc. or a processor to perform all or part of the steps of the various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本申请涉及智能穿戴设备技术领域，提供了一种佩戴状态的检测方法及其检测模块、可穿戴设备。佩戴状态的检测方法，应用于可穿戴设备上，可穿戴设备包括光发生器和光接收器；检测方法包括：控制光发生器向用户发射至少两种光信号；控制光接收器接收至少两种光信号经用户反射后对应的反射光；根据接收到的至少两种反射光的变化趋势确定可穿戴设备的佩戴状态。采用本申请的实施例，使得可以更为准确地确定穿戴设备的佩戴状态。

Description

一种佩戴状态的检测方法及其检测模块、可穿戴设备 技术领域
本申请涉及智能穿戴设备技术领域，特别涉及一种佩戴状态的检测方法及其检测模块、可穿戴设备。
背景技术
随着可穿戴产品丰富，和人们对日常健康监护的重视，可穿戴生物特征采集或检测传感器的应用越来越广泛。可穿戴产品采集生物信号的准确度严重依赖于可穿戴产品的佩戴质量。发明人发现现有技术存在以下问题：目前采用的佩戴检测技术存在误判概率较大或者检测时间较长等缺点，具体现有方法如下：
现有技术中，一种方式是通过添加LED，检测LED的反射光的信号量，利用简单的光学阈值检测是否佩戴，但是此种技术误差较大，而且当有非皮肤组织靠近时也有光信号反射，十分容易造成误判。另一种方式是采用设备穿戴后离人体中的密集血管较近的特性，监测心率信号，当监测到心率信号时，判定佩戴良好，此种方式需要系统时刻保持工作，系统功耗大。
发明内容
本申请部分实施例的目的在于提供一种佩戴状态的检测方法及其检测模块、可穿戴设备，使得可以更为准确地确定穿戴设备的佩戴状态。
本申请实施例提供了一种佩戴状态的检测方法，应用于可穿戴设备上，所述可穿戴设备包括光发生器和光接收器；所述检测方法包括：控制所述光发生器向用户发射至少两种光信号；控制所述光接收器接收所述至少两种光信号经所述用户反射后对应的反射光；根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态。
本申请实施例还提供了一种佩戴状态的检测模块，应用于一种可穿戴设备，所述检测模块包括光发生器、光接收器和处理器；所述处理器分别连接所述光发生器和所述光接收器；所述处理器用于控制所述光发生器向用户发射至少两种光信号，所述处理器还用于控制所述光接收器接收所述至少两种光信号经所述用户反射后对应的反射光，所述处理器还用于根据所述光接收器接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态。
本申请实施例还提供了一种可穿戴设备，包括：如上述的检测模块。
本申请实施例还提供了一种可穿戴设备，包括：至少一个处理器；以及，与所述至少一个处理器通信连接的存储器；其中，所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行如上述的佩戴状态的检测方法。
本申请实施例还提供了一种计算机可读存储介质，存储有计算机程序，所述计算机程序被处理器执行时实现上述的佩戴状态的检测方法。
本申请实施例相对于现有技术而言，利用人体组织的光学特性原理进行 穿戴设备的穿戴情况检测，具体利用在佩戴时检测模块与皮肤所产生的距离变化，在距离变化过程中，根据对接收到的至少两个光信号对应的反射光的变化趋势的检测即可判断出可穿戴设备的佩戴情况。可见，由于采用的是动态变化的数据检测结果，是动态检测，相比现有的静态检测，可以更为准确地确定穿戴设备的佩戴状态。
另外，至少两个所述两个光发生器发射光信号的波长不同。本实施例可以利用不同波长的光在人体组织内和皮肤表面的反射率(透射率)不同确认穿戴检测结果，实现时简便准确。
另外，所述控制光发生器发射至少两种光信号，具体为：控制至少两个光发生器发射所述至少两种光信号，其中，所述至少两个发光生器距所述光接收器的距离不同。本实施例可以根据发生器和接收器距离不同时所产生的不同光路，所造成各光源经过皮肤反射和折射后信号衰减不同的原理确认穿戴检测结果，使得检测简便，结果准确。
另外，所述控制光接收器接收所述至少两种光信号经所述用户反射后对应的反射光，具体为：控制至少两个光接收器分别接收所述至少两种光信号经所述用户反射后对应的反射光。本实施例利用不同的光接收器接收不同光信号的反射光，减少接收到的反射光的互相干扰。
另外，所述控制光发生器向用户发射至少两种光信号，具体为：控制所述光发生器根据预设的发射周期，向用户发射至少两种光信号。本实施例限定可以根据预设的发射周期发射光信号，无需实时发射，可以减少功耗，同时避免不同光信号之间的干扰。
另外，每个所述发射周期被分为若干个发射阶段，每个所述发射周期中 包含的发射阶段数与所述光信号的种类数相同；所述控制光发生器根据预设的发射周期，向用户发射至少两种光信号，具体为：控制所述光发生器根据预设的发射周期，在每个发射阶段中向用户发射一种光信号。本实施例进一步限定了光信号的发射机制，对两种光信号进行分时发送及接收，减少光信号的互相干扰。
另外，当所述光信号为两种，则所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态的步骤，具体包括：计算所述两种反射光的差值，其中，所述差值为一反射光的信号量减去另一反射光的信号量的差值；根据所述差值与预设的两个第一信号量阈值的关系，确定所述可穿戴设备的佩戴状态。进一步限定利用信号量的差值和阈值的比较结果确定佩戴状态，检测过程简便，检测结果准确。
另外，当所述光信号数量大于两种，则所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态的步骤，具体包括：判断其中两种反射光的差值的变化趋势和预存的变化趋势的关系，根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态；或者，将所有反射光两两组合，分别判断每组反射光差值的变化趋势和预存的变化趋势的关系，根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态。进一步限定在光信号超过两种时的判断方法，使得判定出的佩戴状态更为准确。
另外，所述判断两种反射光的差值的变化趋势和预存的变化趋势的关系之前，还包括：判断所述两种反射光的差值和第一信号量阈值的关系；所述根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态的步骤，具体包括：根据所述差值和所述第一信号量阈值关系的判断结果、所述差值的变化趋势的判 断结果确定所述可穿戴设备的佩戴状态。结合差值的大小和变化趋势进行判断，简化判断过程。
另外，所述佩戴状态分为N级，所述第一信号量阈值具有N-1个，所述N为大于1的自然数。本发明实施例中限定预设阈值的数量和佩戴状态的数量间的关系，使得预设阈值的设定更有针对性。
另外，所述佩戴状态分为三级，级数越高对应的佩戴质量越好；所述两种光信号分别为红光和绿光，所述差值等于所述绿光对应的反射光的信号量减去所述红光对应的反射光的信号量，所述预设的两个第一信号量阈值为第一阈值和第二阈值，所述第一阈值大于所述第二阈值；所述根据差值与所述预设的两个第一信号量阈值的关系，确定所述可穿戴设备的佩戴状态的步骤，具体包括：若所述差值大于或等于所述第一阈值，则进一步判断所述差值的变化趋势；若所述差值不断增大，则确定所述佩戴状态为三级佩戴状态，若所述差值不断减小或不变，则返回判断所述差值和所述第一阈值的关系；若所述差值大于所述第二阈值且小于所述第一阈值，则进一步判断所述差值的变化趋势；若所述差值不变或减小，则确定所述佩戴状态为二级佩戴状态，若所述差值不断变大，则返回判断所述差值和所述第二阈值的关系；若所述差值小于或等于所述第二阈值，则确定所述佩戴状态为一级佩戴状态。本实施例进一步限定利用两个第一信号量阈值可以分辨至少三种佩戴状态，利用阈值比较的方法确定佩戴状态，简便直接。
另外，所述预存的变化趋势利用预存的变化趋势利用特征曲线来表征，所述特征曲线包括若干个特征区间；所述判断两种反射光的差值的变化趋势和预存的变化趋势的关系，具体为：根据检测到的两种反射光的差值，绘制检测 曲线；判断所述检测曲线属于预存的哪个特征区间；所述根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态，具体为：根据判定结果确定所述可穿戴设备的佩戴状态。本实施例限定利用特征曲线及划分的特征区间来确定反射光差值的变化趋势，利用可以曲线更为准确地获知所处的佩戴状态，同时提供更为丰富的判断方法。
另外，所述佩戴状态分为N级，所述N为大于1的自然数，至少有一级佩戴状态为佩戴失败；所述检测方法还包括：在判断检测曲线属于预存的哪个特征区间时，判断最后检测到的差值是否达到预设的第二信号量阈值；若未达到，则判定所述可穿戴设备的佩戴状态为佩戴失败。本实施例限定佩戴检测时，一旦检测到差值低于特定阈值，则确定佩戴状态为佩戴失败，进一步简化佩戴检测流程。
另外，所述根据检测到的两种反射光的差值，绘制检测曲线，具体为：根据最后M个检测周期中检测到的两种反射光的差值，绘制检测曲线。本实施例限定检测曲线只根据最近的若干检测数据进行绘制，在满足判断需求的前提下，利用最新数据使得判断出的状态更接近实时情况。
另外，当所述可穿戴设备对应有状态标记，则所述根据差值与所述预设的两个第一信号量阈值的关系，确定所述可穿戴设备的佩戴状态具体为：根据差值与所述预设的两个第一信号量阈值的关系、以及所述状态标记，确定所述可穿戴设备的佩戴状态；所述根据差值与所述预设的两个第一信号量阈值的关系，确定所述可穿戴设备的佩戴状态之后，还包括：根据所确定的佩戴状态更新所述状态标记。进一步限定穿戴设备还设有状态标记，表示穿戴设备的当前状态，在判定时结合当前状态进行联合判断，使得判断结果更为准确。
另外，所述可穿戴设备还包括加速度传感器；在所述控制光接收器接收至少两种光信号经所述用户反射后对应的反射光前，还包括：控制所述加速度传感器检测加速度变化；所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态，具体为：根据接收到的至少两种反射光的变化趋势和所述加速度传感器检测到的加速度变化，确定所述可穿戴设备的佩戴状态。本实施例增加加速度传感器，与光信号检测联合判断，使得检测结果更为准确。
另外，所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态的步骤前，还包括：检测心率信号；所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态，具体为：根据接收到的至少两种反射光的变化趋势和所述心率信号的检测结果，确定所述可穿戴设备的佩戴状态。本实施例进一步增加心率信号检测，对光信号检测结果进行进一步确定，使得获得的佩戴状态的检测结果的准确性。
另外，所述可检测模块还包括光隔离组件，所述光隔离组件和所述光发生器连接。本实施例增加光隔离组件，可以限定光发生器发生的光的形状，防止在光学结构在贴紧皮肤时造成大量漏光，影响佩戴检测效果。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表示为类似的元件，除非有特别申明，附图中的图不构成比例限制。
图1是根据本申请第一实施例中的一检测模块的示意图；
图2是根据本申请第一实施例中的一佩戴状态的检测方法的流程图；
图3是根据本申请第一实施例中的两个光信号被检测到的反射光的变化示意图；
图4是根据本申请第一实施例中的一检测模块的电路图；
图5是根据本申请第二实施例中的一检测模块的示意图；
图6是根据本申请第二实施例中的一检测模块的电路图；
图7是根据本申请第二实施例中的一佩戴状态的检测方法中的工作时序图；
图8是根据本申请第三实施例中的一检测模块的示意图；
图9是根据本申请第三实施例中的一佩戴状态的检测方法的流程图；
图10是根据本申请第三实施例中的一检测模块的电路图；
图11是根据本申请第四实施例中的一佩戴状态的检测方法的流程图；
图12是根据本申请第五实施例中的一佩戴状态的检测方法的流程图；
图13a是根据本申请第五实施例中的一佩戴状态的检测方法中检测曲线绘制的示意图；
图13b是根据本申请第五实施例中的一佩戴状态的检测方法中特征曲线的示意图；
图14是根据本申请第六实施例中的一佩戴状态的检测方法中的工作时序图；
图15是根据本申请第八实施例中的一检测模块的示意图；
图16是根据本申请第十一实施例中的一可穿戴设备的示意图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请部分实施例进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
本申请第一实施例涉及一种佩戴状态的检测方法。应用于一种可穿戴设备上，如图1所示，可穿戴设备包括两个光发生器(分别是LED113和LED114)和一个光接收器(以下部分简称为“PD”)115。需要说明的是，本实施方式中的可穿戴设备还包括光隔离组件111和载板112。光隔离组件111主要用于隔离LED光；载板112，主要用于承载并固定LED113、LED114、PD115以及光隔离组件111。
本实施方式中的流程图如图2所示，具体如下：
步骤201，控制光发生器向用户发射两种光信号。
具体的说，用户可以是使用可穿戴设备的人，也就是说，是将可穿戴设备穿戴在身上的人，本实施方式需检测的就是可穿戴设备相对这个人的佩戴状态。
更具体的说，本实施方式中两个光发生器发射出的光信号的波长不同，分别由LED113发射绿光信号(如525nm)，由LED114发射红光信号(如631nm)。更具体的说，光隔离组件111主要用于控制光发生器发射的光束的形状。本实施方式中可以采用光隔离器，光隔离器是一种只允许单向光通过的无源光器件，其工作原理是基于法拉第旋转的非互易性，通过光纤回波反射的光能够被光隔离器很好的隔离。光隔离器是允许光向一个方向通过而阻止向相反方向通过的无源器件，作用是对光的方向进行限制，使光只能单方向传输， 通过光纤回波反射的光能够被光隔离器很好的隔离，提高光波传输效率。在本实施方式中可以防止在光学结构在贴紧皮肤时造成大量漏光，影响佩戴检测效果。
步骤202，控制光接收器接收反射光。
具体的说，控制光接收器接收两种光信号经用户反射后对应的反射光。更具体的说，由PD接收红光信号和绿光信号。更具体的说，实际应用中可以具体根据预设的检测周期，控制光接收器根据预设的检测周期接收光信号光接收器分别接收来自两个光发射器发出的光信号。其中的检测周期可以是100微秒。
步骤203，根据接收到的两种反射光的变化趋势确定可穿戴设备的佩戴状态。
具体的说，本实施方式中根据接收到的两种光信号对应的反射光的信号量的差值和预设的两个第一信号量阈值确定可穿戴设备的佩戴状态。其中，所述佩戴状态分为N级，所述第一信号量阈值具有N-1个，上述的N为大于1的自然数。更具体的说，佩戴状态分为三级，级数越高对应的佩戴质量越好；两种光信号分别为红光和绿光，差值为绿光对应的反射光的信号量减去红光对应的反射光的信号量的差值，预设的两个第一信号量阈值为第一阈值和第二阈值，第一阈值大于第二阈值；根据差值与预设的两个第一信号量阈值的关系，确定可穿戴设备的佩戴状态的步骤，具体包括：若所述差值大于或等于所述第一阈值，则进一步判断所述差值的变化趋势；若所述差值不断增大，则确定所述佩戴状态为三级佩戴状态，若所述差值不断减小或不变，则返回判断所述差值和所述第一阈值的关系；若所述差值大于所述第二阈值且小于所述第一阈值， 则进一步判断所述差值的变化趋势；若所述差值不变或减小，则确定所述佩戴状态为二级佩戴状态，若所述差值不断变大，则返回判断所述差值和所述第二阈值的关系；若所述差值小于或等于所述第二阈值，则确定所述佩戴状态为一级佩戴状态。
举例来说，三种佩戴状态可以分别是：脱落(一级佩戴状态)、佩戴良好(三级佩戴状态)和正在佩戴(二级佩戴状态)，两种光信号分别为红光和绿光，两个第一信号量阈值可以通过仿真或者技术人员的经验设定。在两种光信号对应的反射光的信号量变化和预设的两个第一信号量阈值的比较时，具体方法如下：
计算绿光的信号量减去红光的信号量，获得差值S。比较该差值S与预设的第一阈值A1、第二阈值A2的关系，其中A1大于A2。当S≥A1，进一步判断S的变化趋势，如果S不断增大，则判定佩戴状态为良好，如果S不断减小或不变，则返回判断S和A1的关系；当A1＞S＞A2，则进一步判断S的变化趋势，如果S不变或减小，则判定佩戴状态为正在佩戴，如果S不断增大，则返回判断S和A2的关系；当S≤A2，则判定佩戴状态为脱落。
值得一提的是，上述提到的不断变大、不断变小等趋势允许在一定的范围内出现抖动，实际可以利用算法去除，在此不再赘述。
本申请发明人发现，由于人体组织对红光和绿光的光学特性原理不同，对两种波长的光信号的吸收率和反射率不同，所以，根据PD的接收值即可确定穿戴设备是否正在靠近人体或远离人体，本发明的发明人对红光信号和绿光信号进行检测，并根据逐渐远离和逐渐靠近对结果分类，获得的数据特征图如图3所示。值得一提的是，反射光的变化趋势可以利用以下参数表征：光的强 度、光的亮度或光的照度。实际应用中，上述参数可以择一采用，也可结合采用，在此不做限定。
同时，从图3中可以看出，曲线301为绿光对应的反射光的信号量曲线，曲线302为红光对应的反射光的信号量曲线，两者相比，在可穿戴设备和人体间的间距动态变化时(即检测过程中)，两者的曲率和峰值出现位置具有明显的不同，所以，根据两种光信号在检测过程中的曲率变化是否一致即可判断出可穿戴设备和人体间的间距是否存在靠近或远离。
从图3中还可以看到在可穿戴设备逐渐远离皮肤的过程中，红LED和绿LED的数据都是先增大后减小的趋势，但是绿LED数据变化比较明显。在可穿戴设备逐渐靠近皮肤的过程中，红LED和绿LED的数据都是先增大后减小，但绿LED的曲线变化显然更为明显。红LED与绿LED数据的差值随着可穿戴设备与皮肤的距离不同而不同，因此可以根据红LED与绿LED的差值进行佩戴检测。具体的说，在采用了红光和绿光的LED时，其发出的光信号的波长差大约为106nm，而实际应用中采用的两个LED的波长之差可以为其他值，如大于或等于50nm。在此需要说明的是，波长差越大，其检测结果将更为准确。
可见，当光信号为两种，则步骤203具体包括：计算两种反射光的差值，其中，差值为一反射光的信号量减去另一反射光的信号量的差值；根据差值与预设的两个第一信号量阈值的关系，确定可穿戴设备的佩戴状态。
本实施方式中的可穿戴设备由于光学结构以及红LED和绿LED的亮度等可以不同，当可穿戴设备与皮肤距离一定时，红LED和绿LED的绝对值不同，从而造成两者差值不同。当固定红LED和绿LED的结构和亮度时，根据接收到的对应两个LED发出光信号的反射光可以判断出可穿戴设备与皮肤 的距离，从而判断出可穿戴设备与皮肤的贴合程度。当接收到的反射光发生变化时，可以根据两者变化趋势判断出可穿戴设备的佩戴与脱落检测。
以上对步骤201至步骤203的说明是对采用一个红光LED和一个绿光LED时信号量阈值对佩戴状态进行检测，实际应用中还可以采用发射其他波长的光信号发生器，并根据实际调整信号量阈值进行佩戴状态进行检测。另外，还可以结合信号量的峰值出现位置是否一致等特性进行判定，使得判断结果更为准确。
值得一提的是，本实施方式中可穿戴设备中实现检测功能部分的模块(下部分简称为“检测模块”)电路结构可以如图4所示，具体包括MCU模块121、积分器模块INT模块122、驱动模块DRV1模块124、DRV2模块123以及红LED(即红光发生器)114、绿LED(即绿光发生器)113和PD115。本实施方式中由MCU模块121作为中央处理单元，主要用于数据处理以及控制INT模块122、DRV1模块124和DRV2模块123。INT模块122用于控制光接收器PD115。DRV1模块124用于控制红LED114，具体控制LED114的亮度和发光时间。DRV2模块123用于控制绿LED113，具体控制LED113的亮度和发光时间。其中，MCU控制模块121，通过控制DRV1模块124和DRV2模块123来间接控制红LED114和绿LED113。MCU控制模块121通过INT模块122获取PD115接收到的光信号。
本实施例相对于现有技术而言，利用人体组织的光学特性原理进行可穿戴设备的穿戴情况检测，根据光学特性原理可知，人体组织对不同光线的吸收率和反射率不同，所以同样距离时不同种光信号的反射光被检测到的信号强弱也会不同，而在距离产生变化时，每种光信号又会分别产生信号强弱的变化， 同样由于人体组织对不同种光线的吸收率和反射率不同，所以不同光信号对应的反射光就会产生不同的强弱变化趋势，相对于静态某点的信号强弱绝对值，信号的变化趋势具有更稳定的特性，不易受外界干扰，据此原理进行的检测，获得的检测结果也更为准确。所以，本实施例具体利用在佩戴时可穿戴设备与皮肤所产生的距离变化，在距离变化过程中，根据对接收到的至少两个光信号对应的反射光的变化趋势的检测即可判断出可穿戴设备的佩戴情况。可见，由于采用的是动态变化的数据检测结果，是动态检测，相比现有的静态检测，可以更为准确地确定可穿戴设备的佩戴状态。另外，进一步地限定为两种光信号和三种佩戴状态，同时还限定了佩戴状态的佩戴规则，使得利用红光和绿光做比较时，各状态的判定规则明确简单。
值得一提的是，虽然第一实施方式中以两个光发生器为例，实际应用中光发生器的数量可以不同，如一个、三个、四个等，同时，本实施方式中以一个光接收器为例，实际应用中可以更多，在此均不作限定。
本实施方式中的光信号数量为两种，根据这两种光信号分别对应的反射光的差值的变化趋势来确定佩戴状态，而实际应用中也可以利用更多数量的光信号进行判断，具体判断时：可以判断其中两种反射光的差值的变化趋势和预存的变化趋势的关系，根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态；或者，可以将所有反射光两两组合，分别判断每组反射光差值的变化趋势和预存的变化趋势的关系，根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态。
本申请第二实施例涉及一种佩戴状态的检测方法。本实施方式和第一实 施方式相类似，主要区别在于：第一实施方式中的两个光发生器发出的光信号的波长不同，而本实施方式中，两个光发生器距光接收器的距离不同。
本实施方式中可穿戴设备中检测模块的结构如图5所示，具体包括：光隔离组件211、载板212、LED213，LED214、PD215。其中，光隔离组件211主要用于隔离LED光；载板212，主要用于承载并固定LED213、LED214、PD215以及光隔离组件211；PD215作为光接收器，用于接收光信号。
同波长佩戴检测方案采用的电路框架如图6所示，此电路中主要包括MCU模块221、INT模块222、DRV1模块224、DRV2模块223以及红LED214、红LED213和PD215。MCU模块221主要用作中央处理单元，主要用于数据处理以及控制INT模块222、DRV1模块和DRV2模块。INT模块222用于控制光接收器PD215。DRV1模块224用于控制红LED214，具体用于控制LED214的亮度和发光时间。DRV2模块223用于控制红LED213，具体用于控制LED213的亮度和发光时间。另外，MCU控制模块221，通过控制DRV1模块224和DRV2模块223来间接控制红LED214和红LED213。MCU控制模块221通过INT模块222获取PD215接收到的光信号。
从上述表述可知的是，本实施方式中采用了两个红光LED作为光发生器(分别是LED213和214)，但这两个LED与PD215的距离不同，从图5中可以看出LED213与PD215的距离更近。可见，由于LED213、LED214和PD215的距离不同，因此在人体皮肤组织与可穿戴设备距离改变时，两者发射的光的传播路径发生变化，PD215接收到的反射光的变化趋势也会不同。根据接收到的两个反射光可以判断出可穿戴设备与皮肤的距离。从而作为可穿戴设备与皮肤贴合状态的判断依据。当接收到两个光信号量发生变化时根据两者的光信号 量变化趋势可以判断出可穿戴设备与皮肤的距离变化趋势，从而可以做出佩戴与脱落的动态检测。
需要说明的是，本实施方式中可以采用分时检测的方法，具体的说，是将一个检测周期分为若干个发射阶段，每个发射周期中包含的发射阶段数与光信号的种类数相同；控制光发生器根据预设的发射周期，向用户发射至少两种光信号，具体为：控制光发生器根据预设的发射周期，在每个发射阶段中向用户发射一种光信号。
具体的说，本实施方式中的工作时序图可以如图7所示，图7所示的为系统工作的一个周期T，在一个工作周期T1中，分两个阶段t1和t2。在t1阶段，红LED213发光，红LED214不发光。在t2阶段，红LED213不发光，红LED214发光。同时在整个周期T中，PD215一直处于工作状态，即在t1阶段，接收到是红LED213的光信号，在t2阶段，接收到的是红LED214的光信号。之后，PD215将接收到的光信号发送至MCU模块221进行处理。其中，t1和t2可以分别是半个周期，即1/2T1，也就是说，如果T1为100微秒，t1和t2可以分别是50微秒。
可见，本实施方式中利用光发生器距光接收器的距离不同，使得接收到光的变化趋势不同，从而实现对可穿戴设备的穿戴情况的检测。本实施方式提供了与第一实施方式不同的方法实现可穿戴设备的穿戴情况检测，使得本发明具有多变的应用场景，实际应用中的实施可以根据实际情况选择不同的实施方案。另外，本实施方式中还叠加采用了分时工作的方法，将两个光发生器设置为不同的工作时序，使得两个光信号不会互相干扰，减少误判。
此外，还需要说明的是，实际应用中还可以同时对第一实施方式提到的 技术方案和本实施方式中提到的技术方案进行组合应用，也就是说，采用的两个LED不仅波长不同，而且与光接收器间的距离也不同。
本申请第三实施例涉及一种佩戴状态的检测方法。本实施方式和第一实施方式相类似，主要区别在于：第一实施方式中采用一个光接收器，而本实施方式中采用两个光接收器。
具体的说，本实施方式中检测模块可以如图8所示，具体包括：光隔离组件311，载板312，红LED313，绿LED315，PD314，PD316。光隔离组件311主要用于隔离LED光；载板312，主要用承载固定红LED313、绿LED315、PD314、PD316以及光隔离组件311；红LED313和绿LED315作为光发生器，用于产生红光和绿光；PD314和PD316作为光接收器。
本实施方式中佩戴状态的检测方法如图9所示，具体如下：
本实施方式中的步骤901与第一实施方式中的步骤201相类似，在此不再赘述。
步骤902，控制两个光接收器分别接收两种光信号经用户反射后对应的反射光。
具体的说，不同的光接收器接收的光信号不同。本实施方式中，PD314只对红光敏感，因此只接收红光信号，PD316只对绿光敏感，因此只接收绿光信号。
本实施方式中的步骤903与第一实施方式中的步骤203相类似，在此不再赘述。
本实施方式中的检测模块的电路可以如图10所示，主要包括MCU模块 321、INT1模块324、INT2模块326、DRV1模块323、DRV2模块325以及红LED313、绿LED315、PD314和PD316。MCU模块321主要用作中央处理单元，主要用于数据处理以及控制INT1模块324、INT2模块326、DRV1模块323和DRV2模块325。INT1模块324用于控制光接收器PD314、INT2模块326用于控制光接收器PD316。DRV1模块323用于控制红LED313，具体用于控制LED214的亮度和发光时间。DRV2模块325用于控制绿LED315，具体用于控制LED315的亮度和发光时间。MCU控制模块321，通过控制DRV1模块323和DRV2模块325来间接控制红LED313和绿LED315。MCU控制模块321通过INT1模块324获取PD314接收到的红光信号，MCU控制模块321通过INT2模块326获取PD316接收到的绿光信号。
可见，本实施方式中由于皮肤组织对红光和绿光的反射率和折射率不同，因此，在皮肤与检测模块距离不同时，PD314和PD316接受到的光信号不同，根据两者差值可以判断出检测模块与皮肤的距离，间接的判断出佩戴情况。皮肤与检测模块距离改变时，两者发射的光的传播路径发生变化。根据接收到的两者光信号量可以判断出检测模块与皮肤的距离。从而作为检测模块与皮肤贴合状态的判断依据。当接收到两者光信号量发生变化时根据两者的光信号量变化趋势可以判断出检测模块与皮肤的距离变化趋势，从而可以做出佩戴与脱落的动态检测。
值得一提的是，虽然本实施方式中采用两个光接收器，但实际应用中可以采用更多数量的光接收器，尤其当光发生器数量更多时，即可以采用更多数量的光接收器，如对应每个光发生器均设置一个光接收器，所以光接收器的具体数量在此不做限定。
本申请第四实施例涉及一种佩戴状态的检测方法。本实施方式是在第一实施方式的基础上做了进一步改进，主要改进之处在于：本实施方式中新增加速度传感器(即Gsensor)，与光接收器接收到的信号量进行结合判断，使得检测结果更为准确。
具体的说，本实施方式中佩戴状态的检测方法如图11所示，具体如下：
本实施方式中的步骤1101和1102与第一实施方式中的步骤201和202相类似，在此不再赘述。
步骤1103，在接收到的两种反射光的变化趋势满足预设条件时，控制加速度传感器检测加速度变化。
具体的说，预设条件可以是符合佩戴状态为正在佩戴或佩戴良好时两种反射光所呈现的变化趋势，具体可以由技术人员根据仿真数据或者根据经验设置。
步骤1104，根据加速度变化，确定可穿戴设备的佩戴状态。
具体的说，本申请发明人发现，由于在佩戴良好时，会存在一定的加速度变化，所以在信号量变化满足预设条件时，再进行加速度变化进行判定，可以更准确地判定是否穿戴良好，减少误判率。也就是说，可以根据接收到的两种反射光的变化趋势和加速度传感器检测到的加速度变化，确定可穿戴设备的佩戴状态。
另外，本实施方式中将反射光的变化趋势作为先行判断，而实际应用中也可以利用加速度传感器进行先行判断，或者两者同时判断。
具体的说，本实施方式在反射光的变化趋势检测之后，再结合Gsensor 的加速度变化检测，由于可穿戴设备被佩戴时，可穿戴设备本身会产生加速度变化，所以增加Gsensor的检测，使得检测结果的准确度大大提升。另外，本实施方式中虽然是先进行反射光的变化趋势的判断，再进行Gsensor的检测，但在实际应用中，也可以将Gsensor的检测作为先行判断，当Gsensor检测到的加速度变化满足预设条件时再启动反射光变化趋势的检测。
另外，本实施方式中利用加速度传感器与反射光的变化趋势检测结合，实际应用中，还可以通过PPG(光电容积图)检测心率信号，利用检测的心率信号与反射光变化趋势的检测结合，从而进行佩戴状态的判定。由于可穿戴设备在被穿戴正确后，与人体组织十分靠近，可检测出心率值、血压、血氧等生理信号，所以利用PPG进行结合检测同样可以大大提升检测结果的准确率。如，先进行反射光的变化趋势的检测，如果其检测结果为佩戴良好，那么进一步采用PPG检测，在PPG检测出心率信号时，输出检测结果为佩戴良好，可以有效降低误判率，同时，在检测结果为未佩戴等其他佩戴状态时，则无需启动心率检测功能，减少心率检测的运行时间，有效降低检测模块功耗。
再者，实际应用中，还可以将加速度变化的检测和心率检测结果同时结合反射光的变化趋势的检测，进一步提升检测结果的准确率。
本申请第五实施例涉及一种佩戴状态的检测方法。本实施方式和第一实施方式相类似，主要区别之处在于：第一实施方式中是根据反射光差值与特定阈值的比较结果结合差值的变化趋势来确定所处的佩戴状态，而本实施方式是利用差值形成的曲线所属预存的特征曲线的某一特征区间来确定所处的佩戴状态。由于曲线更易保留趋势变化的细节，所以利用曲线比对所确定的佩戴状态 更为准确。
本实施方式中的检测方法流程图如图12所示，具体如下：
本实施方式中的步骤1201和步骤1202与第一实施方式中的步骤201和步骤202相类似，在此不再赘述。
步骤1203，根据检测到的两种反射光的差值，绘制检测曲线。
具体的说，本实施方式中可以根据最后100个检测周期中检测到的两种反射光的差值，绘制检测曲线。每个检测周期对应获得一个差值，那么就可以根据最后100个差值，利用这些数据进行曲线拟合，获得一条检测曲线。检测曲线的示意图如图13a所示，图13a中曲线301为绿光对应的反射光的信号量曲线，曲线302为红光对应的反射光的信号量曲线，曲线303即检测曲线为绿光对应的反射光减去红光对应的反射光的信号量曲线。
步骤1204，比对检测曲线和特征曲线。
具体的说，检测曲线是步骤1203中获得的检测曲线，而特征曲线可以是设计人员预先根据所用的光信号的波长绘制的，且特征曲线可以包括若干个特征区间，本实施方式可以采用如图13b所示的特征曲线及特征曲线的划分方式，其中，根据时间顺序，将t0-t1划分为特征区间T1，t0-t3划分为特征区间T2，t2-t4划分为特征区间T3，t4～划分为特征区间T4。
更具体的说，比对时可以采用曲线拟合方式(也可以其他方式)进行匹配，配置指标采用拟合程度R平方值(也可以采用其他指标)表示，例如R平方取值0.8(取值可以为其它，不做限定)。
另外，还需说明的是，在曲线拟合时，无需整个特征区间中的曲线全部拟合，可以增加一个匹配参数X，X表示检测曲线与预存曲线拟合成功的部分。 举例来说，在拟合T2段时，可以在t0～tx进行拟合(tx介于t1与t2之间)，如t0～t1部分占整个T2的60％(对应X为0.6)，t0～t2部分占整个T2的80％(对应X为0.8)，当检测曲线能够与t0～tx(tx介于t1与t2之间)部分成功匹配(R平方大于0.8)时，X值介于0.6～0.8之间。
步骤1205，根据比对结果，判断所述检测曲线属于预存的哪个特征区间。
具体的说，可以根据特征曲线的时间顺序逐一对比各个特征曲线。
举例来说，首先将检测曲线和T1区间中的曲线进行比对，在比对结果达到0.8时，判定属于特征区间T1；在没有达到0.8时，继续比对，同时还可以将检测曲线先变形再和T1区间的特征曲线比对，如果在一段时间后，仍没有达到，则判定为佩戴失败，重新回到绘制检测曲线的步骤。这个阶段中，一旦判定属于特征区间T1，则继续和特征区间T2进行比对，特征区间T2的比对方法和特征区间T1的比对方法类似，需要说明的是，当持续一段时间后，仍无法匹配上特征区间T2，那么将返回重新和特征区间T1进行比对。
值得一提的是，上述提到的曲线变形，可以将绘制完成的检测曲线在横向拉伸或压缩，去除用户使用时可能的佩戴速度差别，也可以将检测曲线进行部分的拉伸或压缩，这样拉伸或压缩后的曲线将更易于特征曲线匹配上。
继续说明，一旦判定属于特征区间T2后，将继续以新的检测数据进行检测曲线的绘制，同时，此时的检测曲线和T3区间中的特征曲线相比对，而且此处的判定可以进行持续判定，不限时间上限。在判定为属于T3区间后，进一步和T4区间比对，在判定出属于T4区间后，之后绘制的曲线将再次和T1曲线对比，以此类推。
步骤1206，根据判定结果确定所述可穿戴设备的佩戴状态。
具体的说，如果判定结果为属于特征区间T1，则确定佩戴状态为“逐渐靠近”，如果判定结果属于特征区间T2，则确定佩戴状态为“佩戴良好”，如果判定结果属于特征区间T3，则确定佩戴状态为“逐渐远离”，如果判定结果属于特征区间T4，则确定佩戴状态为“佩戴失败”。
可见，本实施例限定利用特征曲线图及划分的特征区间来确定反射光差值的变化趋势，利用可以曲线更为准确地获知所处的佩戴状态，同时提供更为丰富的判断方法。另外，由于穿戴设备在佩戴后，可能不会很快摘下，所以本实施方式在T3区间判定时，不设时间上限，更符合实际应用场景，使得判定结果更为准确。
本申请第六实施例涉及一种佩戴状态的检测方法。本实施方式是在第一实施方式中做了进一步改进，主要改进之处在于：将发射周期划分为两个发射阶段，且每个发射阶段中向用户发射一种光信号。使得不同种类的光信号采用分时发送的机制，减少在接收时的光信号干扰。
本实施方式的佩戴状态的检测方法中，每个发射周期被分为若干个发射阶段，每个发射周期中包含的发射阶段数与光信号的种类数相同；控制光发生器根据预设的发射周期，向用户发射至少两种光信号，具体为：控制光发生器根据预设的发射周期，在每个发射阶段中向用户发射一种光信号。
本实施方式中的检测时序图如图14所示，图14所示的为系统工作的一个周期T2，在一个工作周期T2中，分两个阶段t3和t4，t3和绿LED(即绿光发生器)对应，t4和红LED(即红光发生器)对应。所以，在t3阶段，绿LED发光，红LED不发光。在t4阶段绿LED不发光，红LED发光。同时在整个 周期T中，光接收器一直处于工作状态，即在t3阶段，接收到是绿LED的光信号，在t4阶段，接收到的是红LED的光信号。之后，对PD接收到的光信号进行处理。
可见，本实施方式中采用分时发射光信号，使得两个光信号不会产生干扰，使得检测结果更为准确。
本申请第七实施例同样涉及一种佩戴状态的检测方法。本实施例比第一实施例做了进一步改进，主要改进之处在于新增状态标记，利用状态标记和光信号量的联合判断，使得判定结果更为准确。
具体的说，状态标记在每次判定出佩戴状态时被更新。在根据差值与预设的两个第一信号量阈值的关系确定可穿戴设备的佩戴状态时，根据差值与预设的两个第一信号量阈值的关系、以及状态标记，确定可穿戴设备的佩戴状态。
由于发明人发现，佩戴状态为正在佩戴时，可以进一步区分为逐渐靠近和逐渐远离，那么当明确状态标记时，就可以根据光的变化趋势进一步将正在佩戴的状态进行细分。如状态标记为佩戴良好时，结合光信号量不断减小的特性，即可确定佩戴状态为逐渐远离；如状态标记为脱落时，结合光信号量不断增加的特性，即可确定佩戴状态为逐渐靠近。
也就是说，本实施方式中的检测方法还包括：为可穿戴设备预设状态标记；根据差值与预设的两个第一信号量阈值的关系，确定可穿戴设备的佩戴状态具体为：根据差值与预设的两个第一信号量阈值的关系、以及状态标记，确定可穿戴设备的佩戴状态。
还可以进一步优化的是，本实施方式根据差值与预设的两个第一信号量 阈值的关系，确定可穿戴设备的佩戴状态之后，还包括：根据所确定的佩戴状态更新状态标记。
本实施方式在进一步限定可穿戴设备还设有状态标记，表示可穿戴设备的当前状态，在判定时结合当前状态进行联合判断，使得佩戴状态的判断结果更为准确。
上面各种方法的步骤划分，只是为了描述清楚，实现时可以合并为一个步骤或者对某些步骤进行拆分，分解为多个步骤，只要包括相同的逻辑关系，都在本专利的保护范围内；对算法中或者流程中添加无关紧要的修改或者引入无关紧要的设计，但不改变其算法和流程的核心设计都在该专利的保护范围内。
本申请第八实施例涉及一种检测模块。
本实施方式中的检测模块应用于一种可穿戴设备，检测模块可以如图15所示，包括两个光发生器(LED413和414)、一个光接收器(PD415)和处理器(即MCU)；处理器用于控制光发生器向用户发射两种光信号，处理器还用于控制光接收器接收两种光信号经用户反射后对应的反射光，处理器还用于根据光接收器接收到的两种反射光的变化趋势确定可穿戴设备的佩戴状态。
具体的说，本实施方式中的反射光的变化趋势可以利用以下参数表征：光的强度、光的亮度或光的照度。更具体的说，可以利用上述参数之一，也可以利用上述参数中的多个组合。
需要说明的是，本实施方式中的检测模块还包括：光隔离组件411和载板412。光隔离组件411主要用于隔离LED光；载板412，主要用于承载并固定LED413、LED414、PD415以及光隔离组件411。
另外，本实施方式中至少两个光发生器发射光信号的波长不同，或至少两个光发生器距光接收器的距离不同。实际应用中，可以既是两个光发生器发射光信号的波长不同，也是两个光发生器距光接收器的距离不同。另外，实际应用中光接收器的数量还可以为至少两个。需要说明的是，本实施方式是与第一实施方式相对应的装置实施例，本实施方式可与第一实施方式互相配合实施。第一实施方式中提到的相关技术细节在本实施方式中依然有效，为了减少重复，这里不再赘述。相应地，本实施方式中提到的相关技术细节也可应用在第一实施方式中。
本申请第九实施例涉及一种检测模块。本实施方式是在第六实施方式的基础上做的进一步改进，主要改进之处在于：检测模块还包括加速度传感器，加速度传感器与处理器连接；处理器还用于根据接收到的至少两种反射光的变化趋势和加速度传感器检测到的值，确定可穿戴设备的佩戴状态。
本实施方式是与第四实施方式相对应的装置实施例，本实施方式可与第四实施方式互相配合实施。第四实施方式中提到的相关技术细节在本实施方式中依然有效，为了减少重复，这里不再赘述。相应地，本实施方式中提到的相关技术细节也可应用在第四实施方式中。
本申请第十实施例涉及一种可穿戴设备，包括：如第八实施方式或第九实施方式中提到的检测模块。
本申请第十一实施例同样涉及一种可穿戴设备，如图16所示，包括：
至少一个处理器；以及，与至少一个处理器通信连接的存储器；其中，存储器存储有可被至少一个处理器执行的指令，指令被至少一个处理器执行，以使至少一个处理器能够执行如第一实施方式至第七实施方式中任意一个提到的佩戴状态的检测方法。
其中，存储器和处理器采用总线方式连接，总线可以包括任意数量的互联的总线和桥，总线将一个或多个处理器和存储器的各种电路连接在一起。总线还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路连接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口在总线和收发机之间提供接口。收发机可以是一个元件，也可以是多个元件，比如多个接收器和发送器，提供用于在传输介质上与各种其他装置通信的单元。经处理器处理的数据通过天线在无线介质上进行传输，进一步，天线还接收数据并将数据传送给处理器。
处理器负责管理总线和通常的处理，还可以提供各种功能，包括定时，外围接口，电压调节、电源管理以及其他控制功能。而存储器可以被用于存储处理器在执行操作时所使用的数据。
本申请第十二实施例涉及计算机可读存储介质，存储有计算机程序，计算机程序被处理器执行时实现第一实施方式至第七实施方式中任一种的佩戴状态的检测方法。
即，本领域技术人员可以理解，实现上述实施例方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序存储在一个存储介质中，包括若干指令用以使得一个设备(可以是单片机，芯片等)或处理器(processor) 执行本申请各个实施例方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
本领域的普通技术人员可以理解，上述各实施例是实现本申请的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的精神和范围。

Claims (19)

  1. 一种佩戴状态的检测方法，其特征在于，应用于可穿戴设备上，所述可穿戴设备包括光发生器和光接收器；
    所述检测方法包括：
    控制所述光发生器向可穿戴设备的用户发射至少两种光信号；
    控制所述光接收器接收所述至少两种光信号经所述用户反射后对应的反射光；
    根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态。
  2. 如权利要求1所述的佩戴状态的检测方法，其特征在于，
    当所述光信号为两种，则所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态的步骤，具体包括：
    判断所述两种反射光的差值的变化趋势和预存的变化趋势的关系；
    根据所述两种反射光的差值的变化趋势的判断结果确定所述可穿戴设备的佩戴状态；
    当所述光信号种类大于两种，则所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态的步骤，具体包括：
    判断其中两种反射光的差值的变化趋势和预存的变化趋势的关系，根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态；或者，
    将所有种类的反射光按种类两两组合，分别判断每组反射光差值的变化趋势和预存的变化趋势的关系，根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态。
  3. 如权利要求2所述的佩戴状态的检测方法，其特征在于，所述判断两种反射光的差值的变化趋势和预存的变化趋势的关系之前，还包括：
    判断所述两种反射光的差值和第一信号量阈值的关系；
    所述根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态的步骤，具体包括：
    根据所述两种反射光的差值和所述第一信号量阈值关系的判断结果、所述差值的变化趋势的判断结果确定所述可穿戴设备的佩戴状态。
  4. 如权利要求3所述的佩戴状态的检测方法，其特征在于，所述佩戴状态分为N级，所述第一信号量阈值具有N-1个，所述N为大于1的自然数。
  5. 如权利要求4所述的佩戴状态的检测方法，其特征在于，所述佩戴状态分为三级，级数越高对应的佩戴质量越好；
    所述两种光信号分别为红光和绿光，所述差值等于所述绿光对应的反射光的信号量减去所述红光对应的反射光的信号量，预设的两个第一信号量阈值为第一阈值和第二阈值，所述第一阈值大于所述第二阈值；
    所述根据差值与所述预设的两个第一信号量阈值的关系，确定所述可穿戴设备的佩戴状态的步骤，具体包括：
    若所述差值大于或等于所述第一阈值，则进一步判断所述差值的变化趋势；若所述差值不断增大，则确定所述佩戴状态为三级佩戴状态，若所述差值不断减小或不变，则返回判断所述差值和所述第一阈值的关系；
    若所述差值大于所述第二阈值且小于所述第一阈值，则进一步判断所述差值的变化趋势；若所述差值不变或减小，则确定所述佩戴状态为二级佩戴状态，若所述差值不断变大，则返回判断所述差值和所述第二阈值的关系；
    若所述差值小于或等于所述第二阈值，则确定所述佩戴状态为一级佩戴状态。
  6. 如权利要求2所述的佩戴状态的检测方法，其特征在于，所述预存的变化趋势利用特征曲线来表征，所述特征曲线包括若干个特征区间；
    所述判断两种反射光的差值的变化趋势和预存的变化趋势的关系，具体为：
    判断检测到的两种反射光的差值属于所述若干个特征区间的什么特征区间；
    所述根据变化趋势的判断结果确定所述可穿戴设备的佩戴状态，具体为：
    根据判定出的两种反射光的差值所属的特征区间确定所述可穿戴设备的佩戴状态。
  7. 如权利要求6所述的佩戴状态的检测方法，其特征在于，所述佩戴状态分为N级，所述N为大于1的自然数；
    所述检测方法还包括：在判断检测曲线属于所述若干个特征区间的什么特征区间时，判断所检测到的差值是否达到预设的第二信号量阈值；若未达到，则确定所述可穿戴设备的佩戴状态为佩戴失败。
  8. 如权利要求1所述的佩戴状态的检测方法，其特征在于，所述反射光的变化趋势至少利用以下参数之一进行表征：光的强度、光的亮度、光的照度。
  9. 如权利要求5所述的佩戴状态的检测方法，其特征在于，所述检测方法还包括：为所述可穿戴设备预设状态标记；
    所述根据差值与预设的两个第一信号量阈值的关系，确定所述可穿戴设备的佩戴状态具体为：根据差值与所述预设的两个第一信号量阈值的关系以及所述状态标记，确定所述可穿戴设备的佩戴状态。
  10. 如权利要求9所述的佩戴状态的检测方法，其特征在于，所述根据差值与所述预设的两个第一信号量阈值的关系，确定所述可穿戴设备的佩戴状态之后，还包括：根据所确定的佩戴状态更新所述状态标记。
  11. 如权利要求1所述的佩戴状态的检测方法，其特征在于，所述控制光发生器发射至少两种光信号，具体为：控制至少两个光发生器发射所述至少两种光信号，其中，所述至少两个发光生器距所述光接收器的距离不同。
  12. 如权利要求1所述的佩戴状态的检测方法，其特征在于，所述控制光发生器向用户发射至少两种光信号，具体为：控制所述光发生器根据预设的发射周期，向用户发射至少两种光信号；
    其中，每个所述发射周期被分为若干个发射阶段，每个所述发射周期中包含的发射阶段数与所述光信号的种类数相同；
    所述控制光发生器根据预设的发射周期，向用户发射至少两种光信号，具体为：
    控制所述光发生器根据预设的发射周期，在每个发射阶段中向用户发射一种光信号。
  13. 如权利要求1所述的佩戴状态的检测方法，其特征在于，所述可穿戴设备还包括加速度传感器；
    在所述控制光接收器接收至少两种光信号经所述用户反射后对应的反射光前，还包括：
    控制所述加速度传感器检测加速度变化；
    所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态，具体为：
    根据接收到的至少两种反射光的变化趋势和所述加速度传感器检测到的加速度变化，确定所述可穿戴设备的佩戴状态。
  14. 如权利要求1所述的佩戴状态的检测方法，其特征在于，所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态的步骤前，还包括：检测用户的心率信号；
    所述根据接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态，具体为：
    根据接收到的至少两种反射光的变化趋势和所述心率信号的检测结果，确定所述可穿戴设备的佩戴状态。
  15. 一种检测佩戴状态的检测模块，其特征在于，应用于一种可穿戴设备，所述检测模块包括光发生器、光接收器和处理器；
    所述处理器分别电连接所述光发生器和所述光接收器；
    所述处理器用于控制所述光发生器向用户发射至少两种光信号，所述处理器还用于控制所述光接收器接收所述至少两种光信号经所述用户反射后对应的反射光，所述处理器还用于根据所述光接收器接收到的至少两种反射光的变化趋势确定所述可穿戴设备的佩戴状态。
  16. 如权利要求15所述的佩戴状态的检测模块，其特征在于，所述处理器具体包括：
    第一判断子模块，用于在所述光信号为两种时，判断所述两种反射光的差值的变化趋势和预存的变化趋势的关系；
    第一状态确定子模块，用于根据所述第一判断子模块的判断结果确定所述可穿戴设备的佩戴状态；
    第二判断子模块，用于在所述光信号种类大于两种时，判断其中两种反射光的差值的变化趋势和预存的变化趋势的关系；或者，用于在所述光信号种类大于两种时，将所有种类的反射光按种类两两组合，分别判断每组反射光差值的变化趋势和预存的变化趋势的关系；
    第二状态确定子模块，用于根据所述第二判断子模块的判断结果确定所述可穿戴设备的佩戴状态。
  17. 如权利要求15所述的佩戴状态的检测模块，其特征在于，所述检测模块还包括加速度传感器，所述加速度传感器与所述处理器连接；
    所述处理器还用于根据接收到的至少两种反射光的变化趋势和所述加速度传感器检测到的值，确定所述可穿戴设备的佩戴状态。
  18. 一种可穿戴设备，其特征在于，包括：如权利要求15至17中任意一项所述的检测模块。
  19. 一种计算机可读存储介质，存储有计算机程序，其特征在于，所述计算机程序被处理器执行时实现权利要求1至14中任一项所述的佩戴状态的检测方法。
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