CN117442192B - Head-mounted head movement data measurement method - Google Patents
Head-mounted head movement data measurement method Download PDFInfo
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- 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
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- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
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Abstract
The invention discloses a head-wearing head movement data measurement method, which belongs to the technical field of electronic application sensors of the Internet of things, and comprises the steps of arranging one or more movement data measurement devices on a helmet, judging whether a dressing mode is a thick-clothing mode or a single-clothing mode through collected data of an infrared sensor, and correspondingly adjusting the transmitting power and the sampling frequency of the infrared sensor; the method comprises the steps of acquiring angle data and acceleration data, judging whether to stop or transmit the data through interruption, after eliminating illumination interference, calculating acquired data in the singlechip through a comparison algorithm, obtaining and storing head movement state data, and carrying out data conversion on the head movement state data, so that the technical problem of acquiring the head movement data rapidly and with low cost is solved, and the method is simple and reliable, small in size, simple to deploy, good in economy, smaller in electromagnetic radiation, more beneficial to health of users, low in power consumption and beneficial to energy conservation and environmental protection.
Description
Technical Field
The invention belongs to the technical field of electronic application sensors of the Internet of things, and relates to a head-mounted head movement data measurement method.
Background
With the rapid development of artificial intelligence technology and internet of things technology, wearable sensors are increasingly commonly used. At present, the wearable head movement data measuring device mostly adopts wireless measurement positioning technology, video identification positioning technology and the like, and the two devices have higher computing power, have complex system and large volume, and cause adverse effects on human body due to electromagnetic waves.
A. The wearable head movement data measuring device adopting the wireless positioning technology needs to construct a relatively stable reference system and an anti-interference algorithm; the head movement data measuring device adopting video recognition needs to coordinate a plurality of cameras, and the two technologies are applied to different environments, so that custom optimization is often needed.
B. The sensor technology adopting the wireless three-dimensional positioning technology has high complexity, high calculation capacity, complex device and high cost.
C. The head-mounted measuring device adopting the wireless positioning mode inevitably faces the situation that electromagnetic waves are harmful to the health of a human body (particularly the brain). The measuring device adopting video recognition has the risk hidden trouble in the aspect of personal biological information safety.
Disclosure of Invention
The invention aims to provide a head-mounted head movement data measurement method, which solves the technical problem of acquiring head movement data rapidly at low cost.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method of head mounted head movement data measurement, comprising the steps of:
Step 1: one or more movement data measuring devices are arranged on the helmet, the movement data measuring devices comprise a plurality of infrared sensors, a plurality of acceleration sensors and a data processing unit, when the helmet is worn on the head of a tester, the top of the head is set to be above, the irradiation direction of the infrared sensors is downward and used for collecting the rotating angle data of the head of the tester, meanwhile, the acceleration sensors are also used for collecting the clothing data of the tester, the acceleration sensors are used for collecting the acceleration data of the head during movement, and the data processing unit respectively obtains the angle data and the acceleration data collected by the infrared sensors and the acceleration sensors through different data lines and transmits the data to external equipment through an external data interface in the data processing unit;
Step 2: after wearing the helmet, the tester presses a start button on the data processing unit, the data processing unit starts working, self-checks the working state and establishes communication with external equipment;
step 3: the data processing unit judges whether the dressing mode is a thick-garment mode or a single-garment mode according to the acquired clothing data, and correspondingly adjusts the transmitting power and the sampling frequency of the infrared sensor;
step 4: the data processing unit acquires angle data and acceleration data, and the angle data and the acceleration data are cached in a singlechip in the data processing unit;
Step 5: the data processing unit delays a preset time and judges whether external communication interruption occurs or not: if yes, the stored state data of the head movement is sent to external equipment, and step 5 is executed; if not, executing the step 6;
Step 6: after the data processing unit eliminates illumination interference, the collected data in the singlechip is calculated through a comparison algorithm to obtain and store head movement state data, and the head movement state data is subjected to data conversion and is used for being output to external equipment.
Preferably, the infrared sensors are all arranged on the helmet, the acceleration sensor is arranged at the top of the helmet, the infrared sensors are divided into 4 groups, namely a left group, a right group, a rear group and a clothes mode group, the left group and the right group are symmetrically arranged at the left side and the right side of the brim of the helmet respectively, the clothes group is arranged between the left group and the right group and is positioned at the rear side of the brim of the helmet, and the rear group is arranged above the clothes group;
The angles of the orientations of the infrared sensors of the left side group and the right side group with the vertical line of the human body are 25 degrees, the angles of the orientations of the infrared sensors of the clothing mode group with the vertical line of the human body are 15 degrees, and the angles of the orientations of the infrared sensors of the rear side group with the vertical line of the human body are 45 degrees;
The left side group, the right side group and the rear side group all comprise a plurality of infrared sensors which are sequentially arranged at intervals along the hat brim, and one or a plurality of infrared sensors of the clothing mode group are arranged.
Preferably, the collecting of the angle data of the head rotation of the tester is specifically that a reflecting belt is worn on the shoulder of the tester, after the infrared sensors of the left side group and the right side group send out measuring light, the reflected light reflected by the reflecting belt is collected in real time, and the infrared sensors output high level after receiving the reflected light, otherwise, output low level;
The data processing unit acquires output signals of all the infrared sensors, establishes truth tables corresponding to the groups according to group classification of the left group, the right group, the rear group and the clothing group, and defines motion states represented by the truth tables of the groups, wherein the motion states comprise motion states of the left group and the right group in the horizontal direction of the head, and the truth tables corresponding to the rear group represent motion states of the head in the vertical direction;
the truth table of the clothing group indicates the kind of clothing the tester is wearing.
Preferably, the distance between the infrared sensors is adjusted according to the collection range of the infrared sensors and the preset data collection range, the data collection range comprises a human body basic state data collection range and an effective data collection range, the effective data collection range comprises a horizontal state effective data collection range in which the head horizontally rotates 40 degrees to 90 degrees and a pitching state effective data collection range in which the head vertically rotates 30 degrees to 60 degrees, and the human body basic state data collection range comprises a range in which the horizontal rotation angle of the head is 0 degrees to 90 degrees and a range in which the pitching angle is 0 degrees to 60 degrees.
Preferably, the comparison algorithm includes, after acquiring the acquired data output by the encoder, grouping and classifying the acquired data to obtain a group of the acquired data, and then comparing the acquired data with a truth table corresponding to the group of the acquired data to obtain a motion state corresponding to the acquired data.
Preferably, the acceleration data is used to determine whether an impact event has occurred, and if so, the data processing unit generates emergency stop data.
Preferably, when excluding the light interference, the method comprises the following steps:
step 6-1: judging whether one group of infrared sensor outputs of the left group or the right group are all high level: if yes, executing the step 6-2; if not, executing the step 6-3;
step 6-2: at the moment, the group with the output of all high level is judged to be interfered by illumination, the output data of the infrared sensors in the group are shielded, and only the output data of the infrared sensors in the group which is not interfered by illumination are adopted to judge horizontal movement;
step 6-3: and judging that the left group or the right group is not interfered by illumination.
Preferably, all the infrared sensors are provided with polarized lenses, and angles of the polarized lenses of the adjacent infrared sensors are mutually perpendicular.
Preferably, the data processing unit comprises an encoder, a single chip microcomputer, a clock module, a sensor driving module, a power interface and an external data interface, wherein the encoder, the clock module, the sensor driving module and the external data interface are all connected with the single chip microcomputer, a plurality of infrared sensors and acceleration sensors are all connected with the encoder, and the driving module is connected with the infrared sensors and is used for driving the infrared sensors.
Preferably, the encoder comprises a first encoder and a second encoder, wherein the first encoder is connected with a plurality of infrared sensors, and the second encoder is connected with the acceleration sensor.
The head-mounted head movement data measurement method solves the technical problem of quickly acquiring head movement data at low cost, is simple and reliable, small in size, simple to deploy and good in economy, and compared with the prior art, electromagnetic radiation is smaller, health of a user is better facilitated, power consumption is low, and energy conservation and environmental protection are facilitated.
Drawings
FIG. 1 is a schematic block diagram of a motion data measurement device of the present invention;
FIG. 2 is a left side view of the athletic data measurement device of the present invention after it is mounted on a helmet;
FIG. 3 is a top view of the athletic data measurement device of the present invention after it is mounted on a helmet;
FIG. 4 is a front view of the athletic data measurement device of the present invention after it has been mounted on a helmet;
FIG. 5 is a schematic view of the illumination directions of the rear side set and the clothing set of the present invention;
Fig. 6 is a schematic view showing the irradiation direction of the infrared sensor A1 in the left group from the front view of the present invention;
FIG. 7 is a schematic view of the illumination directions of the left side group from the left view perspective of the present invention;
Fig. 8 is a schematic view of an irradiation area of an infrared sensor when a head of the present invention is not rotated;
Fig. 9 is a schematic view of an irradiation area of an infrared sensor after head rotation according to the present invention;
Fig. 10 is a flow chart of the present invention.
In the figure: the infrared sensor A1, the infrared sensor A2, the infrared sensor A3, the infrared sensor B1, the infrared sensor B2, the infrared sensor B3, the infrared sensor C1, the infrared sensor C2, the infrared sensor C3, the helmet 1, the acceleration sensor D1 and the data processing unit M.
Detailed Description
A method of head mounted head movement data measurement as described in figures 1-10, comprising the steps of:
step 1: one or more motion data measuring devices are arranged on the helmet 1, the motion data measuring devices comprise a plurality of infrared sensors, a plurality of acceleration sensors D1 and a data processing unit M, when the helmet 1 is worn on the head of a tester, the top of the head is set to be above, the irradiation direction of the infrared sensors is downward, the infrared sensors are used for collecting angle data of the head of the tester, meanwhile, the acceleration sensors D1 are used for collecting acceleration data of the head of the tester when the tester moves, the data processing unit M is used for respectively acquiring the angle data and the acceleration data collected by the infrared sensors and the acceleration sensors D1 through different data lines, and the data are transmitted to external equipment through an external data interface in the data processing unit M;
The infrared sensors are all arranged on the helmet 1, the acceleration sensor D1 is arranged at the top of the helmet 1, the infrared sensors are divided into 4 groups, namely a left group, a right group, a rear group and a clothes mode group, the left group and the right group are respectively symmetrically arranged at the left side and the right side of the brim of the helmet 1, the clothes group is arranged between the left group and the right group and is positioned at the rear side of the brim of the helmet 1, and the rear group is arranged above the clothes group;
The brim refers to the brim of the helmet 1.
The angles of the orientations of the infrared sensors of the left side group and the right side group with the vertical line of the human body are 25 degrees, the angles of the orientations of the infrared sensors of the clothing mode group with the vertical line of the human body are 15 degrees, and the angles of the orientations of the infrared sensors of the rear side group with the vertical line of the human body are 45 degrees;
The left side group, the right side group and the rear side group all comprise a plurality of infrared sensors which are sequentially arranged at intervals along the hat brim, and one or a plurality of infrared sensors of the clothing mode group are arranged.
In the embodiment, the left side group and the right side group both comprise 3 infrared sensors, the rear side group comprises 2 infrared sensors, and the left side group, the right side group and the rear side group provide horizontal and vertical movement condition data; the accelerometer provides emergency stop data in this embodiment upon the occurrence of an impact event to address an emergency situation such as a collision, impact, fall, etc.
The invention can be removably secured to the helmet 1/head gear.
In the embodiment, the infrared sensor works at a frequency not less than 50Hz, the effective data adopted per second is not less than 5 times, the effective data are matched with the normal head rotation speed of an adult, and the working frequency of the infrared sensor can be adjusted according to the requirement. When the left turn or the right turn of the head is larger than a set angle, the device outputs left turn or right instruction data; the head is leaned back for 1 time beyond the set angle, and the device outputs a speed maintaining instruction; the device outputs a deceleration instruction after continuously leaning backwards for 2 times; forward nodding for 2 times, and outputting an acceleration instruction; when a trigger is impacted or a fall event occurs, the trigger acceleration sensor D1 issues a braking instruction.
According to the invention, 3 infrared sensors are arranged on each group on the left side and the right side, so that the performance of the device in the aspects of reliability, accuracy and redundancy can be greatly improved.
When the infrared sensor is arranged on the head-mounted motion data measuring device, the infrared sensor is basically arranged close to the lower edge, has a certain included angle with the vertical direction of the human body in sitting posture, and is obliquely and fixedly arranged relative to the vertical line of the human body.
When 3 infrared sensors are arranged on each of the left side and the right side, the included angle between each infrared sensor and the vertical line of the human body is 25 degrees. Calculated from the normal human basic size data of an adult, the size of the effective reflective area of the shoulder is a square with a length and width of about 10 cm.
The method comprises the steps that angle data of head rotation of a tester are collected, namely, a reflective belt is worn on the shoulder of the tester, after measuring light is emitted by infrared sensors of a left side group and a right side group, reflected light reflected by the reflective belt is collected in real time, and the infrared sensors output high level after receiving the reflected light, and otherwise, output low level;
The data processing unit M acquires output signals of all the infrared sensors, establishes truth tables corresponding to all the groups according to group classification of a left group, a right group, a rear group and a clothing group, and defines motion states represented by all the truth tables, wherein the motion states comprise motion states represented by the left group and the right group in the horizontal direction of the head, and the truth tables corresponding to the rear group represent motion states in the vertical direction of the head;
the truth table of the clothing group indicates the kind of clothing the tester is wearing.
In this embodiment, a mode of 3 infrared sensors in each group may be adopted, where the infrared sensors A1, A2 and A3 are left groups, the infrared sensors B1, B2 and B3 are right groups, coverage areas of the infrared sensors are shown in fig. 8 and 9, and in the case that the face does not rotate forward, the infrared sensors A2 and B2 modules output high level; the infrared sensor A1, the infrared sensor A3, the infrared sensor B1 and the infrared sensor B3 module output the infrared sensor C1, the infrared sensor C2 and the infrared sensor C3 data at the rear part of the low level, which are not included in the horizontal movement calculation range. When the head rotates horizontally by 40 °, taking left turn as an example as shown in fig. 9, the infrared sensors A1, A2, B2, and B3 may all detect the reflected signals due to the wearing error; when the rotation amplitude is more than 50 degrees, the infrared sensor A1 and the infrared sensor B3 can detect the reflected signals. Thus, the rotation can be determined by comparing the model data of the detection of the A, B infrared sensors. The comparative model values for the motor state results are shown in table 1 below.
| Items | Sensor A1 output | Sensor A2 output | Sensor A3 output | Sensor B1 output | Sensor B2 output | Sensor B3 output | Determination result |
| 1 | 0 | 1 | 0 | 0 | 1 | 0 | Before just, not rotate |
| 2 | 1 | 1 | 0 | 0 | 1 | 1 | Left turn |
| 3 | 1 | 0 | 0 | 0 | 0 | 1 | Left turn |
| 4 | 0 | 0 | 1 | 1 | 0 | 0 | Right turn |
| 5 | 0 | 1 | 1 | 1 | 1 | 0 | Right turn |
TABLE 1
In this embodiment, the photodetection device is easily interfered by sunlight during sunrise and sunset. At this time, the sensors on the sunlight side are all at high level. In this case, the calculation unit determines that the sunlight interference mode shields the data on the side of the light interference; the data on the other side is taken as sampling data.
The pitch motion detection in this embodiment employs 2 sets of infrared sensors. The infrared sensors C1 are individually set, i.e., a clothing set, for measuring whether the clothing is wide or not; one set of infrared sensors C2, C3 is used for pitch state detection, i.e., a rear side set.
According to basic dynamic size data of a human body, the pitching angle range of the head is 0-60 degrees, in the embodiment, the pitching rotation of the head is 30-60 degrees as the effective data acquisition range of a pitching state instruction, the pitching infrared sensor C1 is arranged at the edge of the loading device, and the infrared sensors C2 and C3 are arranged at positions higher than the upper positions. The angle between the central line of the emission angle of the infrared sensor C1 and the vertical line of the body is about 15 degrees; the angles between the midlines of the angles of emission of the infrared sensors C2 and C3 and the vertical line of the body are about 45 DEG
In the case that the head remains level without pitching, none of the infrared sensor C1, the infrared sensor C2, and the infrared sensor C3 detection modules output. When the device is started initially, in the time of 0-10 seconds, the sampling frequency is 50Hz when the high level number detected by the infrared sensor C1 is smaller than 2000 times/10 seconds, and the normal clothing is judged; when the number of detected output high levels is larger than 2000 times/10 s, the clothing is judged to be large, at the moment, the system reduces the output power threshold of the infrared sensor, and the user is prompted to use the reflecting device through an external interface and an external device. After the reflecting device is used, the intensity of reflected light can be increased by more than 20 times, and interference of wide clothes can be effectively eliminated by matching with the angle adjustment of the polarized lens.
According to the acquisition range of the infrared sensors and the preset data acquisition range, the distance between the infrared sensors is adjusted, the data acquisition range comprises a human body basic state data acquisition range and an effective data acquisition range, the effective data acquisition range comprises a horizontal state effective data acquisition range in which the head horizontally rotates 40 degrees to 90 degrees and a pitching state effective data acquisition range in which the head vertically rotates 30 degrees to 60 degrees, and the human body basic state data acquisition range comprises a range in which the horizontal rotation angle of the head is 0 degrees to 90 degrees and a range in which the pitching angle is 0 degrees to 60 degrees.
In this embodiment, the infrared sensor is used to measure the state quantity of the horizontal rotation angle and the pitching rotation angle; the acceleration sensor D1 module is used for measuring acceleration triggering state quantity in the pitching direction; the reflective belt is matched with the infrared sensor for use, and is used for improving the anti-interference performance by adopting a mode of reducing the transmitting power and pasting the reflective device when wearing the wide garment; the data processing unit M carries out data calculation on output data of the infrared sensor and the acceleration sensor D1 to obtain motion state data of the device; the data interface module converts the motion state data into 232/485 standard interface for transmission and dry contact output, and is connected with external equipment or system.
The working power required by the invention is provided by an external power supply.
Step 2: after wearing the helmet 1, a tester presses a start button on the data processing unit M, the data processing unit M starts working, self-checks the working state and establishes communication with external equipment;
Step 3: the data processing unit M judges whether the dressing mode is a thick-garment mode or a single-garment mode according to the acquired clothing data, and correspondingly adjusts the transmitting power and the sampling frequency of the infrared sensor;
Step 4: the data processing unit M acquires angle data and acceleration data, and the angle data and the acceleration data are cached in the singlechip in the data processing unit M;
Step 5: the data processing unit M delays the preset time and judges whether external communication interruption occurs or not: if yes, the stored state data of the head movement is sent to external equipment, and step 5 is executed; if not, executing the step 6;
The acceleration data is used for judging whether an impact event occurs, and if so, the data processing unit M generates emergency stop data.
In this embodiment, the interrupt includes two types, one is an impact event generated by the acceleration data, and the other is an external device acquisition data event.
Step 6: after the data processing unit M eliminates illumination interference, the acquired data in the singlechip is calculated through a comparison algorithm to obtain and store head movement state data, and the head movement state data is subjected to data conversion and is used for being output to external equipment.
When excluding the illumination interference, the method comprises the following steps:
step 6-1: judging whether one group of infrared sensor outputs of the left group or the right group are all high level: if yes, executing the step 6-2; if not, executing the step 6-3;
step 6-2: at the moment, the group with the output of all high level is judged to be interfered by illumination, the output data of the infrared sensors in the group are shielded, and only the output data of the infrared sensors in the group which is not interfered by illumination are adopted to judge horizontal movement;
step 6-3: and judging that the left group or the right group is not interfered by illumination.
The comparison algorithm comprises the steps of firstly grouping and classifying the acquired data after acquiring the acquired data output by the encoder to obtain a group of the acquired data, and then comparing the acquired data with a truth table corresponding to the group of the acquired data to obtain a motion state corresponding to the acquired data.
All the infrared sensors are provided with polarized lenses, and angles of the polarized lenses of the adjacent infrared sensors are mutually perpendicular.
The data processing unit M comprises an encoder, a single chip microcomputer, a clock module, a sensor driving module, a power interface and an external data interface, wherein the encoder, the clock module, the sensor driving module and the external data interface are all connected with the single chip microcomputer, a plurality of infrared sensors and acceleration sensors D1 are all connected with the encoder, and the driving module is connected with the infrared sensors and used for driving the infrared sensors.
The encoder comprises a first encoder and a second encoder, wherein the first encoder is connected with a plurality of infrared sensors, and the second encoder is connected with the acceleration sensor D1.
In this embodiment, the first encoder is an HT6026 encoder, which may be connected to 9 infrared sensors at a time, and the second encoder may also be an HT6026 encoder.
The singlechip adopts STM32F030 singlechip, and the clock module adopts DS3231 calendar chip, and external data interface is 485 or 232 interface, and external data interface is connected with the serial ports of singlechip, and infrared sensor can adopt GP2Y0A21YK0F infrared range finding sensor, drive circuit is the power supply circuit to infrared sensor, can control infrared sensor's opening or closing by field effect transistor.
The power interface is connected with an external power supply and is used for supplying power to the encoder, the singlechip, the clock module, the sensor driving module and the external data interface.
In this embodiment, after initialization, when the outputs of the infrared sensor C1, the infrared sensor C2, and the infrared sensor C3 are all at high levels, it is determined that the pitch-back instruction is mainly used for providing a deceleration signal.
According to the basic dynamic size of the human body and the data, the acceleration generated when the head pitch angle is 45 ° in 0.2 seconds is substantially the same as the impact acceleration generated by the external object at a speed of 10 km/hour, and the acceleration sensor D1 in the present embodiment performs threshold setting with this data.
When the head moves in a pitching mode, whether the head is at a head point or at a head elevation can be determined according to the output time difference of the acceleration sensor D1 in the front-rear direction, and an event can be determined according to the time interval of the acquired data after the trembling is removed.
And whether the forward trigger or the reverse trigger is judged by judging the time sequence of the output of the acceleration sensor D1. Whether forward triggering or reverse triggering is carried out, when the time interval between the two triggering is less than 0.6 seconds, a judging value can be set according to the use requirement of the carrier, the collision event is judged, and the calculating unit sends out a stop instruction to output; and if the forward trigger is firstly generated and then the reverse trigger is generated, and the 2 time interval time is longer than 1 second, the state of nodding is judged, and the computing unit sends out a forward running instruction of the external equipment. When an acceleration output event occurs, an external interrupt instruction of the computing module is triggered, the data of the acceleration sensor D1 are preferentially read, and the data are preferentially computed and output.
The data processing unit M can be integrated on 1 circuit board or split into 2 parts so as to be better integrated on the wearing device. When the clock module, the power management module and the data interface module are split, the clock module, the power management module and the data interface module are integrated into one part, and the other part is the other part.
In this embodiment, a connector is used as a physical interface with an external system, for example: the RJ45 crystal head mode is adopted, and an interface is made of 8 wires. Wherein, RS232/485 interface occupies 4 cores at most, and dry contact output occupies 2 cores, and the power occupies 2 cores. Further, the line physical interface is arranged at the left or right side near the forearm, and the power switch in the present embodiment is arranged in addition to the data interface.
The invention can realize the data measurement and output of the head movement state and provides an operation means for the driving assistance, intelligent care, medical care, remote control operation of sports toys and the like of the electric wheelchair. The device has the advantages of good economy, simplicity, reliability and small wireless radiation.
The head-mounted head movement data measurement method solves the technical problem of quickly acquiring head movement data at low cost, is simple and reliable, small in size, simple to deploy and good in economy, and compared with the prior art, electromagnetic radiation is smaller, health of a user is better facilitated, power consumption is low, and energy conservation and environmental protection are facilitated.
Claims (10)
1. A method of head-mounted head movement data measurement, characterized by: the method comprises the following steps:
Step1: one or more movement data measuring devices are arranged on the helmet (1), each movement data measuring device comprises a plurality of infrared sensors, a plurality of acceleration sensors (D1) and a data processing unit (M), when the helmet (1) is worn on the head of a tester, the top of the head is set to be above, the irradiation direction of each infrared sensor faces downwards and is used for collecting angle data of the head of the tester, meanwhile, clothing data of the tester are also collected, each acceleration sensor (D1) is used for collecting acceleration data of the head when the head moves, and the data processing units (M) respectively obtain the angle data and the acceleration data collected by the corresponding infrared sensors and the corresponding acceleration sensors (D1) through different data lines and transmit the data to external equipment through an external data interface in the data processing unit (M);
Step 2: after wearing the helmet (1), a tester presses a start button on the data processing unit (M), the data processing unit (M) starts to work, self-checks the working state and establishes communication with external equipment;
Step 3: the data processing unit (M) judges whether the dressing mode is a thick-garment mode or a single-garment mode according to the acquired clothing data, and correspondingly adjusts the transmitting power and the sampling frequency of the infrared sensor;
Step 4: the data processing unit (M) acquires angle data and acceleration data, and the angle data and the acceleration data are cached in the singlechip in the data processing unit (M);
step 5: the data processing unit (M) delays for a preset time and judges whether external communication interruption occurs or not: if yes, the stored state data of the head movement is sent to external equipment, and step 5 is executed; if not, executing the step 6;
Step 6: after the data processing unit (M) eliminates illumination interference, the collected data in the singlechip is calculated through a comparison algorithm to obtain and store head movement state data, and the head movement state data is subjected to data conversion and is used for being output to external equipment.
2. A method of head mounted head movement data measurement as claimed in claim 1, wherein: the infrared sensors are all arranged on the helmet (1), the acceleration sensor (D1) is arranged at the top of the helmet (1), the infrared sensors are divided into 4 groups, namely a left group, a right group, a rear group and a clothes mode group, the left group and the right group are symmetrically arranged at the left side and the right side of the brim of the helmet (1) respectively, the clothes group is arranged between the left group and the right group and is positioned at the rear side of the brim of the helmet (1), and the rear group is arranged above the clothes group;
The angles of the orientations of the infrared sensors of the left side group and the right side group with the vertical line of the human body are 25 degrees, the angles of the orientations of the infrared sensors of the clothing mode group with the vertical line of the human body are 15 degrees, and the angles of the orientations of the infrared sensors of the rear side group with the vertical line of the human body are 45 degrees;
The left side group, the right side group and the rear side group all comprise a plurality of infrared sensors which are sequentially arranged at intervals along the hat brim, and one or a plurality of infrared sensors of the clothing mode group are arranged.
3. A method of head mounted head movement data measurement as claimed in claim 2, wherein: the method comprises the steps that angle data of head rotation of a tester are collected, namely, a reflective belt is worn on the shoulder of the tester, after measuring light is emitted by infrared sensors of a left side group and a right side group, reflected light reflected by the reflective belt is collected in real time, and the infrared sensors output high level after receiving the reflected light, and otherwise, output low level;
The data processing unit (M) acquires output signals of all the infrared sensors, establishes truth tables corresponding to all groups according to group classification of a left group, a right group, a rear group and a clothing group, and defines motion states represented by all the truth tables, wherein the motion states comprise motion states of the left group and the right group in the horizontal direction of the head, and the truth tables corresponding to the rear group represent motion states of the head in the vertical direction;
the truth table of the clothing group indicates the kind of clothing the tester is wearing.
4. A method of head mounted head movement data measurement as claimed in claim 1, wherein: according to the acquisition range of the infrared sensors and the preset data acquisition range, the distance between the infrared sensors is adjusted, the data acquisition range comprises a human body basic state data acquisition range and an effective data acquisition range, the effective data acquisition range comprises a horizontal state effective data acquisition range in which the head horizontally rotates 40 degrees to 90 degrees and a pitching state effective data acquisition range in which the head vertically rotates 30 degrees to 60 degrees, and the human body basic state data acquisition range comprises a range in which the horizontal rotation angle of the head is 0 degrees to 90 degrees and a range in which the pitching angle is 0 degrees to 60 degrees.
5. A method of head mounted head movement data measurement as claimed in claim 3, wherein: the comparison algorithm comprises the steps of firstly grouping and classifying the acquired data after acquiring the acquired data output by the encoder to obtain a group of the acquired data, and then comparing the acquired data with a truth table corresponding to the group of the acquired data to obtain a motion state corresponding to the acquired data.
6. A method of head mounted head movement data measurement as claimed in claim 1, wherein: the acceleration data is used to determine whether an impact event has occurred, and if so, the data processing unit (M) generates emergency stop data.
7. A method of head mounted head movement data measurement as claimed in claim 1, wherein: when excluding the illumination interference, the method comprises the following steps:
step 6-1: judging whether one group of infrared sensor outputs of the left group or the right group are all high level: if yes, executing the step 6-2; if not, executing the step 6-3;
step 6-2: at the moment, the group with the output of all high level is judged to be interfered by illumination, the output data of the infrared sensors in the group are shielded, and only the output data of the infrared sensors in the group which is not interfered by illumination are adopted to judge horizontal movement;
step 6-3: and judging that the left group or the right group is not interfered by illumination.
8. A method of head mounted head movement data measurement as claimed in claim 1, wherein: all the infrared sensors are provided with polarized lenses, and angles of the polarized lenses of the adjacent infrared sensors are mutually perpendicular.
9. A method of head mounted head movement data measurement as claimed in claim 1, wherein: the data processing unit (M) comprises an encoder, a singlechip, a clock module, a sensor driving module, a power interface and an external data interface, wherein the encoder, the clock module, the sensor driving module and the external data interface are all connected with the singlechip, a plurality of infrared sensors and acceleration sensors (D1) are all connected with the encoder, and the driving module is connected with the infrared sensors and is used for driving the infrared sensors.
10. A method of head mounted head movement data measurement as claimed in claim 9, wherein: the encoder comprises a first encoder and a second encoder, wherein the first encoder is connected with a plurality of infrared sensors, and the second encoder is connected with the acceleration sensor (D1).
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