WO2015051743A1 - 传感眼动的方法、柔性接触体、外置传感线圈及系统 - Google Patents

传感眼动的方法、柔性接触体、外置传感线圈及系统 Download PDF

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Publication number
WO2015051743A1
WO2015051743A1 PCT/CN2014/088183 CN2014088183W WO2015051743A1 WO 2015051743 A1 WO2015051743 A1 WO 2015051743A1 CN 2014088183 W CN2014088183 W CN 2014088183W WO 2015051743 A1 WO2015051743 A1 WO 2015051743A1
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Prior art keywords
eye movement
coils
magnetic field
sensing
flexible contact
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PCT/CN2014/088183
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English (en)
French (fr)
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胡琨
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胡琨
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Publication of WO2015051743A1 publication Critical patent/WO2015051743A1/zh
Priority to US15/095,222 priority Critical patent/US10111587B2/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/113—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining or recording eye movement
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0016—Operational features thereof
    • A61B3/0025—Operational features thereof characterised by electronic signal processing, e.g. eye models
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1103—Detecting eye twinkling
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
    • A61B5/1126—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb using a particular sensing technique
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/48—Other medical applications
    • A61B5/4863—Measuring or inducing nystagmus
    • 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
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6814—Head
    • A61B5/6821—Eye
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/204—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils
    • G01D5/2046—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the mutual induction between two or more coils by a movable ferromagnetic element, e.g. a core
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/02—Details of sensors specially adapted for in-vivo measurements
    • A61B2562/0223—Magnetic field sensors

Definitions

  • the invention relates to the field of eye movement detection technology, in particular to a method for sensing eye movement, a flexible contact body, an external sensing coil and a system.
  • commonly used eye movement detection methods may include an imaging detection method and a coil detection method.
  • the imaging detection method uses a high-speed camera to take a pupil image to analyze eye movements, which is a large error.
  • the coil detection method a double induction phenomenon can be used, and two sets of right-angle coils are placed, one is an excitation coil that passes a high-frequency current, and the other is a detection coil. Since the two are orthogonal, the induced potential in the detection coil is zero.
  • An inductive coil connected to the tail end is attached to the eyeball, and if an eye movement occurs, a high-frequency current is induced in the induction coil, and the high-frequency magnetic field generated by the induced current is sensed to the detection coil, thereby realizing eye movement detection;
  • this secondary induction phenomenon is weak, the measurement accuracy is low, and the anti-interference ability is also poor.
  • the main object of the present invention is to provide a method for sensing eye movement, which improves the accuracy and stability of eye movement detection.
  • the invention provides a method for sensing eye movement, comprising:
  • the permanent magnet Inducing eye movement by a follow-up signal of a permanent magnet implanted in the flexible contact body caused by eye movement; the permanent magnet is distributed around a periphery of the corresponding contact area of the flexible contact body;
  • the follow-up of the permanent magnets is monitored according to the electromotive force in the coil; the center lines of the four coils are respectively in four directions of the plane coordinate axes, and the two coils on the same axis are wound in opposite directions. And connected in series;
  • the electromotive force is converted to restore the eye movement signal.
  • the direction of the magnetic field of the induced magnetic field coincides with the plane of the cornea; the plane of the coil is perpendicular to the direction of the magnetic field.
  • the converting comprises performing a conversion operation on the electromotive force by a trigonometric function, and then performing compensation.
  • the method further includes:
  • the restored eye movement signal is saved and uploaded to the data server.
  • the invention also provides a flexible contact body, which cooperates with an external sensing coil to sense eye movement, the flexible contact body is in contact with the eye and is implanted with a permanent magnet, and the permanent magnet is distributed in the corresponding pupil area of the flexible contact body. In the periphery, an induced magnetic field that causes the permanent magnet to generate a follow-up signal by eye movement is formed.
  • the direction of the magnetic field of the induced magnetic field coincides with the plane of the cornea.
  • the invention also provides an external sensing coil, which cooperates with a flexible contact body to sense eye movement, the external sensing coil includes at least four coils in the same plane, and monitors the follow-up of the permanent magnet according to the electromotive force in the coil;
  • the center lines of the four coils are respectively in four directions of the plane coordinate axis, and the two coils on the same axis are wound oppositely and connected in series.
  • the coil plane is perpendicular to the direction of the magnetic field.
  • the invention also proposes a system for sensing eye movement, comprising:
  • the sensing coil uses at least four coils whose peripheral devices are in the same plane, and monitors the follow-up of the permanent magnet according to the electromotive force in the coil; the center lines of the four coils are respectively in four directions of the plane coordinate axis, and two on the same axis The coils are wound in opposite directions and connected in series;
  • the conversion and reduction device converts the electromotive force and restores the eye movement signal.
  • the direction of the magnetic field of the induced magnetic field coincides with the plane of the cornea; the plane of the coil is perpendicular to the plane of the cornea.
  • the converting comprises performing a conversion operation on the electromotive force by a trigonometric function, and then performing compensation.
  • the system further comprises:
  • the uploading device is stored, and the restored eye movement signal is saved and uploaded to the data server.
  • the invention can detect the electromotive force generated by the movement of the flexible contact body due to the eye movement by the sensing coil distributed around the eyelid, and analyze the electromotive force, thereby objectively analyzing the micro-eye sac, the blinking eye and/or the stimuli caused by the conscious task.
  • Actions such as nystagmus can also analyze important information such as behavior patterns of the brain, explicit changes due to defects or training.
  • FIG. 1 is a schematic flow chart of steps in an embodiment of a method for sensing eye movement according to the present invention
  • FIG. 2 is a schematic flow chart of steps in another embodiment of the method for sensing eye movement of the present invention.
  • FIG. 3 is a schematic view showing the combination of a flexible contact body and an external sensing coil according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of functional modules in an embodiment of the system for sensing eye movement of the present invention.
  • FIG. 5 is a schematic diagram of functional modules in another embodiment of the system for sensing eye movement of the present invention.
  • the above method for sensing eye movements may include:
  • Step S10 inducing eye movement by a follow-up signal of a permanent magnet implanted in the flexible contact body caused by eye movement; the permanent magnet is distributed around the corresponding contact area of the flexible contact body;
  • Step S11 using at least four coils whose peripheral devices are in the same plane, and monitoring the follow-up of the permanent magnet according to the electromotive force in the coil; the center lines of the four coils are respectively in four directions of the plane coordinate axis, and two coils on the same axis Circumscribed opposite and connected in series;
  • Step S12 Converting the electromotive force to restore the eye movement signal.
  • the above method for sensing eye movement can form an induced magnetic field by implanting a ring-shaped magnetic permanent magnet in a flexible contact body.
  • the permanent magnets are distributed in the periphery of the corresponding pupil region in the flexible contact body and do not hinder the subject's line of sight.
  • the flexible contact body may be an eye contact device such as a contact lens.
  • the ring The permanent magnets may constitute an induced magnetic field that produces a magnetic field that is aligned with the plane of the cornea. After the flexible contact body contacts the eye, when there is eye movement, the permanent magnet (induced magnetic field) will be caused to follow.
  • the sensing coil is used to monitor the induced magnetic field, and according to the electromotive force induced by the induced magnetic field, the following magnetic field generated by the induced magnetic field is captured.
  • the sensing coil may be disposed on a worn eyeglass frame or other support fixed around the eyelid, and the sensing coil may include at least four coils in the same plane, and the center lines of the four coils are respectively In the four directions of the plane coordinate axis, the center line is extended to form a cross, and the four coils are respectively located in the four directions of the cross.
  • the two coils on the same coordinate axis are wound in opposite directions and connected in series, which can be beneficial for eliminating external electromagnetic interference and sensing the electromotive force generated by the permanent magnets in the middle portion of the two coils.
  • the direction of the magnetic field of the induced magnetic field may coincide with the plane of the cornea; the plane of the coil may be perpendicular to the direction of the magnetic field.
  • the electromotive forces induced by the two sets of coils that form the cross perpendicularly to each other are trigonometrically converted, and with appropriate compensation, the eye movement signal can be restored.
  • the electromotive force may include information such as intensity and direction; the eye movement signal may include information such as speed and direction.
  • the direction and speed of the eye movement can be calculated by vector summation of the ratio and direction of the induced electromotive force.
  • the sign of the X axis determines the movement to both sides of the Y axis, that is, when the X-week data is positive, the direction of motion is the direction of the arrow along the X-axis, and vice versa, the direction of motion is the direction of the arrow away from the X-axis; for the same reason, the Y-axis If the value is positive, it means that the eyeball moves from bottom
  • the method for sensing eye movement may further include:
  • Step S13 Save and upload the restored eye movement signal to the data server.
  • the above-mentioned eye movement signal storage and transmission can be realized by devices such as a microcontroller, a memory, and a communication device.
  • the transmission technology may include wired transmission and wireless transmission, and also includes short-distance transmission and long-distance transmission. Thereby, it is possible to store and upload an eye movement signal closely related to the perceptual task, the above-mentioned eye movement letter
  • the number may include detailed information such as microscopic saccades, nystagmus, and/or blinks.
  • the above method for sensing eye movements accomplishes a specific perceptual task by allowing the object to be detected to wear a flexible contact body having a special magnetic field distribution, such as a task requiring attention, memory, and perceptual participation, through a distribution distributed around the eyelids.
  • the sense coil detects the electromotive force generated by the movement of the flexible contact body due to the eye movement, and analyzes the electromotive force, thereby objectively analyzing the micro eye jump, the blink eye and/or the eye movement caused by the above-mentioned sensory task, thereby Analyze important information such as brain behavior patterns, explicit changes due to defects or training.
  • the flexible contact body 10 can cooperate with an external sensing coil to sense eye movement.
  • the flexible contact body 10 is in contact with the eye and is implanted with a permanent magnet 11 distributed around the corresponding pupil area of the flexible contact body 10.
  • An induced magnetic field that causes the permanent magnet 11 to generate a follow-up signal by eye movement is formed.
  • an induced magnetic field can be constructed by implanting a ring-shaped magnetic permanent magnet 11 in the flexible contact body 10.
  • the permanent magnets 11 are distributed in the periphery of the corresponding pupil region in the flexible contact body 10 without hindering the subject's line of sight.
  • the flexible contact body 10 can be an eye contact device such as a contact lens.
  • the annular permanent magnet 11 can constitute an induced magnetic field that produces a magnetic field that is aligned with the plane of the cornea. After the flexible contact body 10 contacts the eye, when there is eye movement, the permanent magnet (induced magnetic field) will be caused to follow.
  • the sensing coil is used to monitor the induced magnetic field, and according to the electromotive force induced by the induced magnetic field, the following magnetic field generated by the induced magnetic field is captured.
  • the sensing coil may be disposed on a worn eyeglass frame or other support fixed around the eyelid, and the sensing coil may include at least four coils 21 in the same plane, and centerlines of the four coils 21 They are respectively in four directions of the plane coordinate axis, and the center lines are respectively extended to form a cross, and the four coils 21 are respectively located in four directions of the cross.
  • the windings of the two coils 21 on the same coordinate axis are opposite to each other and connected in series, which is advantageous for eliminating external electromagnetic interference and sensing the electromotive force generated by the permanent magnets 11 in the middle portion of the two coils 21.
  • the direction of the magnetic field of the induced magnetic field may coincide with the plane of the cornea; the plane of the coil 21 may be perpendicular to the direction of the magnetic field.
  • the two sets of coils 21 that form a cross perpendicularly to each other (each set of coils 21 is aligned by two directions but
  • the electromotive force induced by winding the opposite coils 21 in series is converted by a trigonometric function, and with appropriate compensation, the eye movement signal can be restored.
  • the electromotive force may include information such as intensity and direction; the eye movement signal may include information such as speed and direction.
  • the direction and speed of the eye movement can be calculated by vector summation of the ratio and direction of the induced electromotive force.
  • the intensity of the X-axis coil 21 is +1.5
  • the intensity of the Y-axis is -1.5
  • the sign of the X axis determines the movement to both sides of the Y axis, that is, when the X-week data is positive, the direction of motion is the direction of the arrow along the X-axis, and vice versa, the direction of motion is the direction of the arrow away from the X-axis; for the same reason, the Y-axis If the value is positive, it means that the eyeball moves from bottom to
  • the external sensing coil can cooperate with the flexible contact body 10 to sense eye movement.
  • the external sensing coil includes at least four coils 21 in the same plane, and the follow-up of the permanent magnet 11 is monitored according to the electromotive force in the coil 21;
  • the center lines of the coils 21 are respectively in four directions of the plane coordinate axes, and the two coils 21 on the same axis are wound in opposite directions and connected in series.
  • an induced magnetic field can be constructed by implanting a ring-shaped magnetic permanent magnet 11 in the flexible contact body 10.
  • the permanent magnets 11 are distributed in the periphery of the corresponding pupil region in the flexible contact body 10 without hindering the subject's line of sight.
  • the flexible contact body 10 can be an eye contact device such as a contact lens.
  • the annular permanent magnet 11 can constitute an induced magnetic field that produces a magnetic field that is aligned with the plane of the cornea. After the flexible contact body 10 contacts the eye, when there is eye movement, the permanent magnet (induced magnetic field) will be caused to follow.
  • the sensing coil is used to monitor the induced magnetic field, and according to the electromotive force induced by the induced magnetic field, the following magnetic field generated by the induced magnetic field is captured.
  • the sensing coil may be disposed on a worn eyeglass frame or other support fixed around the eyelid, and the sensing coil may include at least four coils 21 in the same plane, and centerlines of the four coils 21 In the four directions of the plane coordinate axis, the center line is extended to form a cross, and the four coils 21 are respectively located on the cross. The four directions.
  • the windings of the two coils 21 on the same coordinate axis are opposite to each other and connected in series, which is advantageous for eliminating external electromagnetic interference and sensing the electromotive force generated by the permanent magnets 11 in the middle portion of the two coils 21.
  • the direction of the magnetic field of the induced magnetic field may coincide with the plane of the cornea; the plane of the coil 21 may be perpendicular to the direction of the magnetic field.
  • the electromotive force induced by the two sets of coils 21 which form the cross perpendicularly to each other are converted by a trigonometric function, and with appropriate compensation, the eye movement can be restored.
  • the electromotive force may include information such as intensity and direction; the eye movement signal may include information such as speed and direction.
  • the system for sensing eye movements may include: an induced magnetic field 31, a sensing coil 32, and a conversion reduction device 33; the induced magnetic field 31, a follow-up signal of the permanent magnet 11 implanted in the flexible contact body 10 by eye movement
  • the permanent magnet 11 is distributed around the corresponding pupil area of the flexible contact body 10; the sensing coil 32 is configured to monitor the permanent magnet 11 according to the electromotive force in the coil 21 by using at least four coils 21 in which the peripheral devices are in the same plane.
  • the center lines of the four coils 21 are respectively in four directions of the plane coordinate axis, and the two coils 21 on the same axis are wound oppositely and connected in series; the conversion reduction device 33 converts the electromotive force and restores the eye movement signal .
  • the above-described system for sensing eye movement can constitute an induced magnetic field by implanting a ring-shaped magnetic permanent magnet 11 in the flexible contact body 10.
  • the permanent magnets 11 are distributed in the periphery of the corresponding pupil region in the flexible contact body 10 without hindering the subject's line of sight.
  • the flexible contact body 10 can be an eye contact device such as a contact lens.
  • the annular permanent magnet 11 can constitute an induced magnetic field 31 which produces a magnetic field direction which coincides with the plane of the cornea. After the flexible contact body 10 contacts the eye, when the eye movement occurs, the permanent magnet 11 (induced magnetic field 31) will be caused to follow.
  • the induced magnetic field 31 is monitored by the sensing coil, and the induced magnetic field generated by the induced magnetic field 31 is captured according to the electromotive force induced by the induced magnetic field 31.
  • the sensing coil 32 can be disposed on a worn eyeglass frame or other support fixed around the eyelid, and the sensing coil 32 can include at least four coils 21 in the same plane, four coils 21
  • the center lines are respectively in four directions of the plane coordinate axis, and the center line is extended to form a cross, and the four coils 21 are respectively located in four directions of the cross.
  • the winding phase of the two coils 21 on the same coordinate axis Conversely, in series with each other, it is advantageous to eliminate external electromagnetic interference and to sense the electromotive force generated by the permanent magnet 11 in the middle portion of the two coils 21.
  • the direction of the magnetic field of the induced magnetic field 31 may coincide with the plane of the cornea; the plane of the coil may be perpendicular to the direction of the magnetic field.
  • the electromotive force induced by the two sets of coils 21 which form the cross perpendicularly to each other are converted by a trigonometric function, and with appropriate compensation, the eye movement can be restored.
  • the electromotive force may include information such as intensity and direction; the eye movement signal may include information such as speed and direction.
  • the direction and speed of the eye movement can be calculated by vector summation of the ratio and direction of the induced electromotive force.
  • the intensity of the X-axis coil 21 is +1.5
  • the intensity of the Y-axis is -1.5
  • the sign of the X axis determines the movement to both sides of the Y axis, that is, when the X-week data is positive, the direction of motion is the direction of the arrow along the X-axis, and vice versa, the direction of motion is the direction of the arrow away from the X-axis; for the same reason, the Y-axis If the value is positive, it means that the eyeball moves from bottom to
  • the system for sensing eye movements 30 further includes: a storage uploading device 34 that saves and uploads the restored eye movement signal to the data server.
  • the above-mentioned eye movement signal storage and transmission can be realized by devices such as a microcontroller, a memory, and a communication device.
  • the transmission technology may include wired transmission and wireless transmission, and also includes short-distance transmission and long-distance transmission. Thereby, it is possible to store and upload eye movement signals closely related to the perceptual task, and the eye movement signals may include detailed information such as micro-eyes, eye movements, and/or blinks.
  • the above-described system for sensing eye movements performs specific conscious tasks by allowing the object to be detected to wear a flexible contact body 10 having a special magnetic field distribution, such as tasks requiring attention, memory, and perceptual participation, distributed around the eyelids.
  • the sensing coil detects the electromotive force generated by the flexible contact body 10 due to the eye movement, and analyzes the electromotive force, thereby objectively analyzing the micro-eye sac, the blinking eye, and/or the nystagmus caused by the above-mentioned sensory task. This can also analyze important information such as behavior patterns of the brain, explicit changes due to defects or training.

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Abstract

提供了一种传感眼动的方法，柔性接触体、外置传感线圈及系统。该方法包括：通过眼动引起的植入柔性接触体（10）中的永磁体（11）的随动信号，感应眼动；所述永磁体（11）分布于柔性接触体对应瞳孔区域的周边；利用外设处于同一平面的至少四个线圈（21），根据线圈（21）内电动势监测永磁体（11）的随动；所述四个线圈（21）的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈（21）绕向相反且互相串联；对电动势进行转换，还原眼动信号。通过分布在眼眶周围的传感线圈（21）检测由于眼动导致柔性接触体（20）从动而产生的电动势，分析该电动势，即可据此客观分析由知觉任务引发的眼动。

Description

传感眼动的方法、柔性接触体、外置传感线圈及系统 技术领域
本发明涉及到眼动检测技术领域，特别是涉及到一种传感眼动的方法、柔性接触体、外置传感线圈及系统。
背景技术
现有技术中，常用的眼动检测方式可包括成像探测法和线圈探测法。成像探测法使用高速摄像机拍摄瞳孔图像分析眼动，此方式误差较大。线圈探测法中可利用双感应现象，放置两组直角的线圈，一组为通高频电流的激励线圈，另一组为检测线圈，由于二者正交，检测线圈中的感应电势为零。设置一首尾相接的感应线圈，附着于眼球上，如果出现眼动则感应线圈中将感应出高频电流，该感应电流产生的高频磁场又会感应至检测线圈，如此实现眼动检测；但此种二次感应现象较为微弱，测量精度较低且抗干扰能力也较差。
发明内容
本发明的主要目的为提供一种传感眼动的方法，提升了眼动检测准确性及稳定性。
本发明提出一种传感眼动的方法，包括：
通过眼动引起的植入柔性接触体中的永磁体的随动信号，感应眼动；所述永磁铁分布于柔性接触体对应瞳孔区域的周边；
利用外设处于同一平面的至少四个线圈，根据线圈内电动势监测永磁体的随动；所述四个线圈的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈绕向相反且互相串联；
对电动势进行转换，还原眼动信号。
优选地，所述感应磁场的磁场方向与角膜平面一致；所述线圈平面与所述磁场方向垂直。
优选地，所述转换包括通过三角函数对所述电动势进行转换运算，再进行补偿。
优选地，所述方法还包括：
将所述还原的眼动信号保存并上传至数据服务器。
本发明还提出一种柔性接触体，与外置传感线圈配合传感眼动，所述柔性接触体与眼睛接触并植入有永磁体，所述永磁体分布于柔性接触体对应瞳孔区域的周边，形成通过眼动使得永磁体产生随动信号的感应磁场。
优选地，所述感应磁场的磁场方向与角膜平面一致。
本发明还提出一种外置传感线圈，与柔性接触体配合传感眼动，所述外置传感线圈包括处于同一平面的至少四个线圈，根据线圈内电动势监测永磁体的随动；所述四个线圈的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈绕向相反且互相串联。
优选地，所述线圈平面与所述磁场方向垂直。
本发明还提出一种传感眼动的系统，包括：
感应磁场，通过眼动引起的植入柔性接触体中的永磁体的随动信号，感应眼动；所述永磁铁分布于柔性接触体对应瞳孔区域的周边；
传感线圈，利用外设处于同一平面的至少四个线圈，根据线圈内电动势监测永磁体的随动；所述四个线圈的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈绕向相反且互相串联；
转换还原设备，对电动势进行转换，还原眼动信号。
优选地，所述感应磁场的磁场方向与角膜平面一致；所述线圈平面与所述角膜平面垂直。
优选地，所述转换包括通过三角函数对所述电动势进行转换运算，再进行补偿。
优选地，所述系统还包括：
存储上传设备，将所述还原的眼动信号保存并上传至数据服务器。
本发明可通过分布在眼眶周围的传感线圈检测由于眼动导致柔性接触体从动而产生电动势，分析该电动势，即可据此客观分析由知觉任务引发的微眼跳、瞬眼和/或眼震等动作，由此还可以分析出一些诸如大脑的行为模式、由于缺陷或训练引起的外显的改变等重要信息。
附图说明
图1是本发明传感眼动的方法一实施例中的步骤流程示意图；
图2是本发明传感眼动的方法另一实施例中的步骤流程示意图；
图3是本发明一实施例中柔性接触体与外置传感线圈的组合示意图；
图4是本发明传感眼动的系统一实施例中的功能模块示意图；
图5是本发明传感眼动的系统另一实施例中的功能模块示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
参照图1，提出本发明一种传感眼动的方法一实施例。上述传感眼动的方法可包括：
步骤S10、通过眼动引起的植入柔性接触体中的永磁体的随动信号，感应眼动；所述永磁铁分布于柔性接触体对应瞳孔区域的周边；
步骤S11、利用外设处于同一平面的至少四个线圈，根据线圈内电动势监测永磁体的随动；所述四个线圈的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈绕向相反且互相串联；
步骤S12、对电动势进行转换，还原眼动信号。
上述传感眼动的方法，可通过在柔性接触体中植入环形的磁性较强的永磁体，构成感应磁场。该永磁体磁性越强，信号越容易取得，具体可根据需要而定。该永磁体分布在柔性接触体中对应瞳孔区域的周边，不会防碍受试者的视线。本实施例中，该柔性接触体可为隐形眼镜等眼睛接触设备。该环 形永磁体可构成感应磁场，其产生的磁场方向可与角膜的平面一致。在该柔性接触体接触到眼睛后，当有眼动产生时，将使得该永磁铁(感应磁场)产生随动。
再利用传感线圈监测上述感应磁场，根据该感应磁场随动所感生的电动势，捕捉眼动产生时该感应磁场产生的随动。本实施例中，该传感线圈可设置于佩戴的眼镜框架或其它固定在眼眶周围的支撑物上，该传感线圈可包括至少四个在同一平面的线圈，四个线圈的中心线分别处于平面坐标轴四个方向，中心线分别延长即可构成一个十字架，四个线圈分别位于十字架的四个方向。且，该位于同一坐标轴上的两个线圈的绕向相反，互相串联，既可有利于消除外界的电磁干扰，又能感应两个线圈的中间部分的永磁体随动产生的电动势。上述感应磁场的磁场方向可与角膜平面一致；上述线圈平面可与该磁场方向垂直。
上述互相垂直构成十字架的两组线圈(每组线圈由两个方向一致但绕向相反的线圈串联)所感应的电动势通过三角函数转换，加上适当的补偿，就可以还原出眼动的信号。上述电动势可包括：强度和方向等信息；上述眼动信号可包括：速度和方向等信息。
上述感应的电动势的强度的比例和方向，通过矢量求和，可以计算出眼动的方向和速度。关于眼动的方向和速度：比如X轴线圈的强度是+1.5，Y轴的强度是－1.5，则眼动的角度为：a＝arctan(1.5/1.5)＝315(－45度就是360-45度即315度)，在第4象限；速度为:S＝两轴强度的平方和再开方，即
Figure PCTCN2014088183-appb-000001
X轴的符号决定了向Y轴的两边运动，即当X周数据为正的时候，运动方向为沿着X轴箭头方向，反之则运动方向为背离X轴箭头方向；同理，Y轴的值为正，则表明眼球由下向上运动，反之则反；所以，计算角度可以简化，就是取两个值的反正切函数即可；依据两个值的符号可以判断运动的方向，求平方和再开方就表达速度了。
参照图2，在本发明的另一实施例中，上述传感眼动的方法还可包括：
步骤S13、将上述还原的眼动信号保存并上传至数据服务器。
上述眼动信号的保存及传输可由微控制器、存储器及通讯设备等设备实现。该传输技术可包括有线传输和无线传输，也包括近距离传输及远距离传输等。从而可实现存储和上传跟知觉任务密切相关的眼动信号，上述眼动信 号可包括微眼跳、眼震和/或瞬眼等的详细信息。
上述传感眼动的方法，通过让被检测的对象佩戴具有特殊磁场分布的柔性接触体，完成特定的知觉任务，比如需要注意力、记忆、感知觉参与的任务，通过分布在眼眶周围的传感线圈检测由于眼动导致柔性接触体从动而产生电动势，分析该电动势，即可据此客观分析由上述知觉任务引发的微眼跳、瞬眼和/或眼震等动作，由此还可以分析出一些诸如大脑的行为模式、由于缺陷或训练引起的外显的改变等重要信息。
参照图3，提出本发明一种柔性接触体的一实施例。该柔性接触体10可与外置传感线圈配合传感眼动，该柔性接触体10与眼睛接触并植入有永磁体11，该永磁体11分布于柔性接触体10对应瞳孔区域的周边，形成通过眼动使得永磁体11产生随动信号的感应磁场。
本实施例中，可通过在柔性接触体10中植入环形的磁性较强的永磁体11，构成感应磁场。该永磁体11磁性越强，信号越容易取得，具体可根据需要而定。该永磁体11分布在柔性接触体10中对应瞳孔区域的周边，不会防碍受试者的视线。本实施例中，该柔性接触体10可为隐形眼镜等眼睛接触设备。该环形永磁体11可构成感应磁场，其产生的磁场方向可与角膜的平面一致。在该柔性接触体10接触到眼睛后，当有眼动产生时，将使得该永磁铁(感应磁场)产生随动。
再利用传感线圈监测上述感应磁场，根据该感应磁场随动所感生的电动势，捕捉眼动产生时该感应磁场产生的随动。本实施例中，该传感线圈可设置于佩戴的眼镜框架或其它固定在眼眶周围的支撑物上，该传感线圈可包括至少四个在同一平面的线圈21，四个线圈21的中心线分别处于平面坐标轴四个方向，中心线分别延长即可构成一个十字架，四个线圈21分别位于十字架的四个方向。且，该位于同一坐标轴上的两个线圈21的绕向相反，互相串联，既可有利于消除外界的电磁干扰，又能感应两个线圈21的中间部分的永磁体11随动产生的电动势。上述感应磁场的磁场方向可与角膜平面一致；上述线圈21平面可与该磁场方向垂直。
上述互相垂直构成十字架的两组线圈21(每组线圈21由两个方向一致但 绕向相反的线圈21串联)所感应的电动势通过三角函数转换，加上适当的补偿，就可以还原出眼动的信号。上述电动势可包括：强度和方向等信息；上述眼动信号可包括：速度和方向等信息。
上述感应的电动势的强度的比例和方向，通过矢量求和，可以计算出眼动的方向和速度。关于眼动的方向和速度：比如X轴线圈21的强度是+1.5，Y轴的强度是－1.5，则眼动的角度为：a＝arctan(1.5/1.5)＝315(－45度就是360-45度即315度)，在第4象限；速度为:S＝两轴强度的平方和再开方，即
Figure PCTCN2014088183-appb-000002
X轴的符号决定了向Y轴的两边运动，即当X周数据为正的时候，运动方向为沿着X轴箭头方向，反之则运动方向为背离X轴箭头方向；同理，Y轴的值为正，则表明眼球由下向上运动，反之则反；所以，计算角度可以简化，就是取两个值的反正切函数即可；依据两个值的符号可以判断运动的方向，求平方和再开方就表达速度了。
参照图3，提出本发明一种外置传感线圈的一实施例。该外置传感线圈可与柔性接触体10配合传感眼动，该外置传感线圈包括处于同一平面的至少四个线圈21，根据线圈21内电动势监测永磁体11的随动；该四个线圈21的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈21绕向相反且互相串联。
本实施例中，可通过在柔性接触体10中植入环形的磁性较强的永磁体11，构成感应磁场。该永磁体11磁性越强，信号越容易取得，具体可根据需要而定。该永磁体11分布在柔性接触体10中对应瞳孔区域的周边，不会防碍受试者的视线。本实施例中，该柔性接触体10可为隐形眼镜等眼睛接触设备。该环形永磁体11可构成感应磁场，其产生的磁场方向可与角膜的平面一致。在该柔性接触体10接触到眼睛后，当有眼动产生时，将使得该永磁铁(感应磁场)产生随动。
再利用传感线圈监测上述感应磁场，根据该感应磁场随动所感生的电动势，捕捉眼动产生时该感应磁场产生的随动。本实施例中，该传感线圈可设置于佩戴的眼镜框架或其它固定在眼眶周围的支撑物上，该传感线圈可包括至少四个在同一平面的线圈21，四个线圈21的中心线分别处于平面坐标轴四个方向，中心线分别延长即可构成一个十字架，四个线圈21分别位于十字架 的四个方向。且，该位于同一坐标轴上的两个线圈21的绕向相反，互相串联，既可有利于消除外界的电磁干扰，又能感应两个线圈21的中间部分的永磁体11随动产生的电动势。上述感应磁场的磁场方向可与角膜平面一致；上述线圈21平面可与该磁场方向垂直。
上述互相垂直构成十字架的两组线圈21(每组线圈21由两个方向一致但绕向相反的线圈21串联)所感应的电动势通过三角函数转换，加上适当的补偿，就可以还原出眼动的信号。上述电动势可包括：强度和方向等信息；上述眼动信号可包括：速度和方向等信息。
参照图4，提出本发明一种传感眼动的系统30的一实施例。该传感眼动的系统30可包括：感应磁场31、传感线圈32以及转换还原设备33；该感应磁场31，通过眼动引起的植入柔性接触体10中的永磁体11的随动信号，感应眼动；该永磁铁11分布于柔性接触体10对应瞳孔区域的周边；该传感线圈32，利用外设处于同一平面的至少四个线圈21，根据线圈21内电动势监测永磁体11的随动；该四个线圈21的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈21绕向相反且互相串联；该转换还原设备33，对电动势进行转换，还原眼动信号。
上述传感眼动的系统，可通过在柔性接触体10中植入环形的磁性较强的永磁体11，构成感应磁场。该永磁体11磁性越强，信号越容易取得，具体可根据需要而定。该永磁体11分布在柔性接触体10中对应瞳孔区域的周边，不会防碍受试者的视线。本实施例中，该柔性接触体10可为隐形眼镜等眼睛接触设备。该环形永磁体11可构成感应磁场31，其产生的磁场方向可与角膜的平面一致。在该柔性接触体10接触到眼睛后，当有眼动产生时，将使得该永磁铁11(感应磁场31)产生随动。
再利用传感线圈监测上述感应磁场31，根据该感应磁场31随动所感生的电动势，捕捉眼动产生时该感应磁场31产生的随动。本实施例中，该传感线圈32可设置于佩戴的眼镜框架或其它固定在眼眶周围的支撑物上，该传感线圈32可包括至少四个在同一平面的线圈21，四个线圈21的中心线分别处于平面坐标轴四个方向，中心线分别延长即可构成一个十字架，四个线圈21分别位于十字架的四个方向。且，该位于同一坐标轴上的两个线圈21的绕向相 反，互相串联，既可有利于消除外界的电磁干扰，又能感应两个线圈21的中间部分的永磁体11随动产生的电动势。上述感应磁场31的磁场方向可与角膜平面一致；上述线圈平面可与该磁场方向垂直。
上述互相垂直构成十字架的两组线圈21(每组线圈21由两个方向一致但绕向相反的线圈21串联)所感应的电动势通过三角函数转换，加上适当的补偿，就可以还原出眼动的信号。上述电动势可包括：强度和方向等信息；上述眼动信号可包括：速度和方向等信息。
上述感应的电动势的强度的比例和方向，通过矢量求和，可以计算出眼动的方向和速度。关于眼动的方向和速度：比如X轴线圈21的强度是+1.5，Y轴的强度是－1.5，则眼动的角度为：a＝arctan(1.5/1.5)＝315(－45度就是360-45度即315度)，在第4象限；速度为:S＝两轴强度的平方和再开方，即
Figure PCTCN2014088183-appb-000003
X轴的符号决定了向Y轴的两边运动，即当X周数据为正的时候，运动方向为沿着X轴箭头方向，反之则运动方向为背离X轴箭头方向；同理，Y轴的值为正，则表明眼球由下向上运动，反之则反；所以，计算角度可以简化，就是取两个值的反正切函数即可；依据两个值的符号可以判断运动的方向，求平方和再开方就表达速度了。
参照图5，在本发明另一实施例中，上述传感眼动的系统30还可包括：存储上传设备34，将该还原的眼动信号保存并上传至数据服务器。
上述眼动信号的保存及传输可由微控制器、存储器及通讯设备等设备实现。该传输技术可包括有线传输和无线传输，也包括近距离传输及远距离传输等。从而可实现存储和上传跟知觉任务密切相关的眼动信号，上述眼动信号可包括微眼跳、眼震和/或瞬眼等的详细信息。
上述传感眼动的系统30，通过让被检测的对象佩戴具有特殊磁场分布的柔性接触体10，完成特定的知觉任务，比如需要注意力、记忆、感知觉参与的任务，通过分布在眼眶周围的传感线圈检测由于眼动导致柔性接触体10从动而产生电动势，分析该电动势，即可据此客观分析由上述知觉任务引发的微眼跳、瞬眼和/或眼震等动作，由此还可以分析出一些诸如大脑的行为模式、由于缺陷或训练引起的外显的改变等重要信息。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (12)

  1. 一种传感眼动的方法，其特征在于，包括：
    通过眼动引起的植入柔性接触体中的永磁体的随动信号，感应眼动；所述永磁铁分布于柔性接触体对应瞳孔区域的周边；
    利用外设处于同一平面的至少四个线圈，根据线圈内电动势监测永磁体的随动；所述四个线圈的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈绕向相反且互相串联；
    对电动势进行转换，还原眼动信号。
  2. 根据权利要求1所述的传感眼动的方法，其特征在于，所述感应磁场的磁场方向与角膜平面一致；所述线圈平面与所述磁场方向垂直。
  3. 根据权利要求1所述的传感眼动的方法，其特征在于，所述转换包括通过三角函数对所述电动势进行转换运算，再进行补偿。
  4. 根据权利要求1至3中任一项所述的传感眼动的方法，其特征在于，所述方法还包括：
    将所述还原的眼动信号保存并上传至数据服务器。
  5. 一种柔性接触体，其特征在于，与外置传感线圈配合传感眼动，所述柔性接触体与眼睛接触并植入有永磁体，所述永磁体分布于柔性接触体对应瞳孔区域的周边，形成通过眼动使得永磁体产生随动信号的感应磁场。
  6. 根据权利要求5所述的柔性接触体，其特征在于，所述感应磁场的磁场方向与角膜平面一致。
  7. 一种外置传感线圈，其特征在于，与柔性接触体配合传感眼动，所述外置传感线圈包括处于同一平面的至少四个线圈，根据线圈内电动势监测永磁体的随动；所述四个线圈的中心线分别处于平面坐标轴四个方向，同一轴 上的两个线圈绕向相反且互相串联。
  8. 根据权利要求7所述的外置传感线圈，其特征在于，所述线圈平面与所述磁场方向垂直。
  9. 一种传感眼动的系统，其特征在于，包括：
    感应磁场，通过眼动引起的植入柔性接触体中的永磁体的随动信号，感应眼动；所述永磁铁分布于柔性接触体对应瞳孔区域的周边；
    传感线圈，利用外设处于同一平面的至少四个线圈，根据线圈内电动势监测永磁体的随动；所述四个线圈的中心线分别处于平面坐标轴四个方向，同一轴上的两个线圈绕向相反且互相串联；
    转换还原设备，对电动势进行转换，还原眼动信号。
  10. 根据权利要求9所述的传感眼动的系统，其特征在于，所述感应磁场的磁场方向与角膜平面一致；所述线圈平面与所述角膜平面垂直。
  11. 根据权利要求9所述的传感眼动的系统，其特征在于，所述转换包括通过三角函数对所述电动势进行转换运算，再进行补偿。
  12. 根据权利要求9至11中任一项所述的传感眼动的系统，其特征在于，所述系统还包括：
    存储上传设备，将所述还原的眼动信号保存并上传至数据服务器。
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