CN111297377A - Measuring device and method for flash fusion critical frequency - Google Patents

Measuring device and method for flash fusion critical frequency Download PDF

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Publication number
CN111297377A
CN111297377A CN201911250345.1A CN201911250345A CN111297377A CN 111297377 A CN111297377 A CN 111297377A CN 201911250345 A CN201911250345 A CN 201911250345A CN 111297377 A CN111297377 A CN 111297377A
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China
Prior art keywords
frequency
numbers
light source
stroboscopic
tested person
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CN201911250345.1A
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Chinese (zh)
Inventor
杜海龙
孙瑞山
陈婧
孙立斌
闫星辰
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Civil Aviation University of China
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Civil Aviation University of China
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Priority to CN201911250345.1A priority Critical patent/CN111297377A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
    • A61B5/161—Flicker fusion testing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
    • A61B5/165—Evaluating the state of mind, e.g. depression, anxiety
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/74—Details of notification to user or communication with user or patient ; user input means
    • A61B5/742—Details of notification to user or communication with user or patient ; user input means using visual displays
    • A61B5/7445—Display arrangements, e.g. multiple display units
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/74—Details of notification to user or communication with user or patient ; user input means
    • A61B5/746—Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2503/00—Evaluating a particular growth phase or type of persons or animals
    • A61B2503/20—Workers
    • A61B2503/22—Motor vehicles operators, e.g. drivers, pilots, captains

Abstract

The invention discloses a device and a method for measuring flash fusion critical frequency, wherein the method comprises the following steps: acquiring a high frequency and a low frequency; randomly acquiring any two numbers from 0 to 9, wherein one of the two numbers is displayed at a high frequency, and the other number is displayed at a low frequency; receiving a flashing number in two numbers selected by a tested person; interchanging the light-emitting frequencies corresponding to the two numbers; receiving a flashing digit in the two digits after the frequency selected by the tested person is interchanged; adjusting the high-frequency or the low-frequency according to the results of the two times of receiving, and skipping to randomly obtain any two digits in 0-9, wherein one of the two digits is displayed in the high-frequency mode, and the other digit is displayed in the low-frequency mode; and determining the flash fusion critical frequency of the tested person according to the light emitting frequency corresponding to the current two numbers until the tested person correctly selects the flash number in the two numbers twice. The invention can improve the detection precision of the fatigue degree of the operator.

Description

Measuring device and method for flash fusion critical frequency
Technical Field
The invention relates to the technical field of nerve fatigue testing, in particular to a device and a method for measuring flash fusion critical frequency.
Background
Fatigue is a complex psychophysiological phenomenon, is a comprehensive self-feeling or feeling of a human body to the reaction process made at this stage when the body is overloaded physically or mentally, and is a normal physiological activity rule of the human body. In the field of aviation, a pilot is a subject who operates an airplane and performs a flight task, and the flight operation capability (including physical conditions, psychological conditions and the like) of the pilot seriously affects the completion quality of the task and the flight safety of the pilot. When a pilot drives an airplane for a long time or keeps a nervous tension state for a long time, flight fatigue is generated, and is an important factor causing the reduction of flight operation capacity, and data show that: about 75% of aviation flight accidents are related to errors caused by the pilot's own flight fatigue.
Temporal visual acuity is an important index for evaluating the level of human vision, and is the ability of human eyes to distinguish the temporal characteristics of the movement changes of objects, and is often expressed by the maximum fusion frequency of a certain flash that human eyes can grasp. The human eyes are stimulated by light with a certain frequency, when the frequency is lower than the light-emitting frequency of the stroboscopic threshold limit value of the human eyes, the human eyes can generate a bright-dark flicker feeling, on the contrary, if the frequency is higher than the light-emitting frequency of the stroboscopic threshold limit value of the human eyes, the human eyes can not feel that the human eyes flicker but feel a completely stable or continuous light, the phenomenon is called as a flicker fusion phenomenon, and the frequency of light stimulation intermittence when the flicker just reaches fusion is called as a flicker critical fusion frequency. A higher flash threshold fusion frequency value indicates a higher temporal visual acuity for a person. Therefore, the flash critical fusion frequency value is a basic index of the temporal visual acuity. In the fatigue state, the central function tends to be inhibitory, and the arousal degree is reduced, and the temporal sensitivity of the human body is reduced, which means that the critical flicker fusion frequency is reduced. Research shows that the critical flicker fusion frequency is one of the accepted and generally adopted fatigue evaluation methods at home and abroad, and is an objective experimental index for the excitation state of central nerves.
In the prior art, a device for detecting the critical flicker fusion frequency is usually provided with only one flicker visual target and one knob, and a testee adjusts the knob to the critical frequency to complete the test, however, the test device designed in the way has the following disadvantages caused by subjective control of the testee: 1) whether the tested person is matched with the test or not cannot be judged, and whether the condition of disordered adjustment is possible to verify by carrying out multiple tests or not is possible; 2) because the adjustment is the frequency adjustment from high to low or reverse, and the knob is step-by-step adjusted, if the testee does not want to be verified as being in a fatigue state, the frequency reaches the frequency range of a non-fatigue state by hand feeling, or the adjustment is continued to reach the normal range even if the critical fusion frequency is reached. According to past experience, the measurement error of the prior art is large, and if the technique is used for actual mental fatigue detection, the accuracy of the result cannot be guaranteed, so that the fatigue degree of the operator cannot be objectively judged.
Disclosure of Invention
The invention aims to provide a device and a method for measuring flash fusion critical frequency, which can improve the detection precision of the fatigue degree of an operator.
In order to achieve the purpose, the invention provides the following technical scheme:
a flash fusion critical frequency measurement apparatus, comprising: the device comprises a controller, an input unit, a first stroboscopic luminous light source group, a second stroboscopic luminous light source group and a seven-segment digital tube;
the first stroboscopic luminous light source group, the second stroboscopic luminous light source group and the input unit are connected with the controller; the first stroboscopic luminous light source group and the second stroboscopic luminous light source group are positioned in the seven-segment digital tube;
the first stroboscopic luminous light source group and the second stroboscopic luminous light source group are used for displaying numbers;
the input unit is used for a tested person to input an observation result, and the observation result comprises a flashing number, a non-flashing number or no flashing;
the controller is used for controlling the first stroboscopic luminous light source group and the second stroboscopic luminous light source group to randomly display any two numbers from 0 to 9, the two numbers have different luminous frequencies, the number with the lower frequency in the two numbers is completely displayed, and the number with the higher frequency only displays the part which is not overlapped with the number with the lower frequency;
the controller is also used for judging whether the observation result input by the tested person is correct or not.
Optionally, the lighting system further comprises a frequency switching unit, the frequency switching unit is connected to the controller, and the frequency switching unit is configured to enable the lighting frequencies of the first stroboscopic lighting light source group and the second stroboscopic lighting light source group to be switched with each other.
Optionally, the system further comprises a display, the display is connected with the controller, and the display is used for displaying the test result of the tested person.
Optionally, the device further comprises a warning unit, the warning unit is connected with the controller, the warning unit is used for prompting the testing behavior of the tested person to the monitoring person, and the testing behavior of the tested person is not matched with the testing behavior and comprises the two digits input by the tested person and the digits except the digits formed by combining the two digits when the two digits are displayed.
Optionally, the lighting device further comprises a brightness adjusting unit, wherein the brightness adjusting unit is connected to the first stroboscopic light-emitting light source group and the second stroboscopic light-emitting light source group, and is used for adjusting the brightness of the first stroboscopic light-emitting light source group and the brightness of the second stroboscopic light-emitting light source group.
Optionally, a light shielding plate is further included for shielding the light of the external environment.
A method for measuring flash fusion critical frequency is applied to a device for measuring flash fusion critical frequency, and comprises the following steps:
acquiring a high frequency and a low frequency;
randomly acquiring any two numbers from 0 to 9, wherein one of the two numbers is displayed at the high frequency, and the other number is displayed at the low frequency;
receiving a flashing number in the two numbers selected by the tested person;
interchanging the light emitting frequencies corresponding to the two numbers;
receiving a flashing digit in the two digits after the frequency selected by the tested person is interchanged;
adjusting the high-frequency or the low-frequency according to the results of the two times of receiving, and skipping to the step of randomly acquiring any two numbers from 0 to 9, wherein one of the two numbers is displayed by the high-frequency, and the other number is displayed by the low-frequency;
until receiving the figure that the tested person correctly selects the flashing figure in the two figures twice;
and determining the flash fusion critical frequency of the tested person according to the light emitting frequencies corresponding to the current two numbers.
Optionally, if the results of the two selections of the detected person are received, the two numbers and the numbers except the numbers formed by combining the two numbers when the two numbers are displayed simultaneously, the uncooperative test behavior of the detected person is prompted to the monitoring person through the warning unit.
Optionally, the initial high-frequency or the initial low-frequency is adjusted by a bisection method.
Optionally, when the two numbers are displayed simultaneously, the result of the simultaneous display is any one of the numbers 0 to 9.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, the first stroboscopic luminous light source group and the second stroboscopic luminous light source group are nested in the same seven-segment digital tube and are displayed through two different frequencies, so that the fatigue degree of an operator can be accurately obtained without being influenced by the subjective purpose of a tested person, and the method is simple to operate and low in cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a block diagram of a flash fusion critical frequency measurement apparatus according to the present invention;
FIG. 2 is a flowchart of a method for measuring a flash fusion threshold frequency according to the present invention;
FIG. 3 is a schematic diagram of digital exclusion for the method of measuring the flicker fusion threshold frequency according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a device and a method for measuring flash fusion critical frequency, which can improve the detection precision of the fatigue degree of an operator.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
FIG. 1 is a block diagram of a flash fusion critical frequency measurement apparatus according to the present invention; as shown in fig. 1, a flash fusion critical frequency measuring apparatus includes: the device comprises a controller 101, an input unit 102, a first stroboscopic light-emitting light source group 103, a second stroboscopic light-emitting light source group 104, a seven-segment digital tube, a frequency switching unit 105, a display 106, a warning unit 107, a brightness adjusting unit 108 and a light shielding plate.
Wherein, the input unit 102, the frequency switching unit 105, the display 106 and the warning unit 107 are all connected with the controller 101; the input ends of the first stroboscopic light-emitting light source group 103 and the second stroboscopic light-emitting light source group 104 are connected with the controller 101 through the driving circuit; the first stroboscopic luminous light source group 103 and the second stroboscopic luminous light source group 104 are positioned in the seven-segment nixie tube; the luminance adjusting unit 108 is connected to the first stroboscopic light-emitting light source group 103 and the second stroboscopic light-emitting light source group 104.
Specifically, the input unit 102 is provided with "start" and "end" keys for initializing a program and ending a test, and the input unit 102 is further provided with "0-9" numerals, "no flashing at all" and "confirm" keys for the subject to input an observation result, which includes a flashing number or no flashing at all.
The first stroboscopic luminous light source group 103 and the second stroboscopic luminous light source group 104 comprise LED nixie tube light sources, the luminous frequency of the first stroboscopic luminous light source group 103 and the luminous frequency of the second stroboscopic luminous light source group 104 are 4-60HZ and are used for displaying numbers, the luminous frequency of the first stroboscopic luminous light source group 103 and the luminous frequency of the second stroboscopic luminous light source group 104 can be adjusted, the luminous frequency range is 4-60Hz, and the minimum interval of gear shifting is 0.1 Hz; the light emission color of the first stroboscopic light-emitting light source group 103 and the second stroboscopic light-emitting light source group 104 can be adjusted, and is preferably red.
The frequency switching unit 105 includes a frequency switch, and is configured to enable the light emitting frequencies of the first stroboscopic light emitting light source group and the second stroboscopic light emitting light source group to be switched with each other, that is, the light emitting frequencies of the same group are required to be observed by the person to be measured twice.
The controller 101 is configured to control the first stroboscopic light-emitting light source group 103 and the second stroboscopic light-emitting light source group 104 to randomly display any two numbers from 0 to 9, where the two numbers have different light-emitting frequencies and equal frequency difference, a lower frequency number of the two numbers is completely displayed, and a higher frequency number only displays a part that is not overlapped with the lower frequency number; the controller 101 is also used to determine whether the observation result input by the subject is correct.
The display 106 is a liquid crystal display screen and is used for displaying the test result, the test times and the abnormal conditions of the tested person.
The warning unit 107 includes an audio sound circuit for prompting the monitoring person of the test-unmatched test behavior of the tested person, which includes the input of the two numbers by the tested person and the numbers other than the numbers formed by the combination of the two numbers when the two numbers are displayed.
The brightness adjustment unit 108 includes a brightness adjustment knob, which is preferably a rotary encoder, for adjusting the brightness of the first and second stroboscopic light-emitting light source groups.
The shading plate is used for isolating light rays of the external environment.
FIG. 2 is a flowchart of a method for measuring a flash fusion threshold frequency according to the present invention; as shown in fig. 2, a method for measuring a flicker fusion critical frequency includes:
step 201: acquiring a high frequency and a low frequency;
step 202: randomly acquiring any two numbers from 0 to 9, wherein one of the two numbers is displayed at the high frequency, and the other number is displayed at the low frequency;
step 203: receiving a flashing number in the two numbers selected by the tested person;
step 204: interchanging the light emitting frequencies corresponding to the two numbers;
step 205: receiving a flashing digit in the two digits after the frequency selected by the tested person is interchanged;
step 206: adjusting the high-frequency or the low-frequency according to the results of the two times of receiving, and skipping to the step of randomly acquiring any two numbers from 0 to 9, wherein one of the two numbers is displayed by the high-frequency, and the other number is displayed by the low-frequency;
step 207: until receiving the figure that the tested person correctly selects the flashing figure in the two figures twice;
step 208: and determining the flash fusion critical frequency of the tested person according to the light emitting frequencies corresponding to the current two numbers.
Wherein, step 201 specifically includes: when the tested person presses the 'start' button, the device is initialized, and the controller randomly acquires a high frequency and a low frequency, wherein the high frequency is 30-35HZ, and the low frequency is 15-20HZ, and the stroboscopic threshold value of the ordinary person is a known value and is 35-37 HZ.
The two numbers in step 202 satisfy that when the two numbers are displayed simultaneously, the result of the simultaneous display is one number, i.e. considering the case of a full flash or no flash of the two numbers, the random selection of two numbers will exclude some cases like 1 and 2 that cannot be one number when displayed simultaneously, as shown in fig. 3.
In step 204, the light emitting frequencies of the first stroboscopic light emitting source group and the second stroboscopic light emitting source group are switched to each other by the frequency switch.
In step 203 and step 205, if the results of the two selections of the tested person are received and are numbers other than the two numbers and the numbers formed by combining the two numbers when the two numbers are displayed simultaneously, for example, the two numbers are 1 and 3 respectively, and the numbers formed by combining the two numbers when the two numbers are displayed simultaneously in the seven-segment digital tube are 3, when the results of the two selections of the tested person are neither 1 nor 3, it is indicated that the tested person is not matched with the test, and the warning unit prompts the monitoring person that the tested person is not matched with the test behavior.
In step 206-step 208, the initial high frequency or the initial low frequency is adjusted by using a dichotomy, and the specific frequency adjustment method is as follows:
if the two observation results of the tested person on the same group of frequencies are two same numbers which are correctly selected, namely the numbers formed by combining the two numbers, the initially set frequency is too low, the system automatically increases the high frequency of the next test to the greatest extent, preferably 50HZ, and the high frequency is observed again after being increased; if the second test result is that two different numbers are correctly selected, the system selects a value between the initial high-frequency and the heightened high-frequency through a dichotomy to serve as the high-frequency of the next test;
if the two observation results of the tested person on the same group of frequencies are correct to select two different numbers, the system selects the frequency of the next test between the high frequency and the low frequency of the test through a dichotomy;
if the two observations of the same group of frequencies by the tested person are all 'no flash', the initial set frequency is too high, the system automatically reduces the low frequency of the next test as much as possible, preferably 20HZ, and the low frequency is reduced and then observed again; if two different numbers are correctly selected in the second test result, the system selects a value between the initial low-frequency and the low-frequency after being reduced by a dichotomy as the high-frequency of the next test;
if the tested person correctly selects two different numbers in two observations of the same group of frequencies, the tested person can judge to continue testing or terminate testing according to the requirement of testing accuracy, and if the selection is terminated, an 'end' button is pressed, and a testing result interval is displayed on a display screen; if it is desired to continue the test, steps 102 to 106 are repeated until the desired accuracy is achieved and the minimum interval within which the frequency of the device can be stepped is 0.1 HZ.
If the tested person selects wrong numbers in two observations of the same group of frequencies, namely the numbers are different from two numbers and the numbers formed when the two numbers are displayed simultaneously, for example, the two numbers are respectively 1 and 3, the numbers formed when the two numbers are displayed simultaneously are also 3, if the tested person selects 5 or 4 and other numbers except 1 and 3, a sound alarm is started, and the monitored person is prompted to not cooperate with the test behavior.
The invention is supported by a theoretical relationship between critical flash fusion frequency and human body central excitation state, two groups of LED nixie tube light sources are utilized to randomly display numbers 0-9, the two groups of LED nixie tube light sources are different from each other but are embedded in the same seven-segment nixie tube, the frequencies of the two groups of LED nixie tube light sources are higher and lower, the frequency difference is fixed, the low-frequency display numbers are completely displayed, the high-frequency display numbers only display the parts which are not overlapped with the low-frequency display numbers, and after the first observation is finished, the high-frequency display and the low; the frequency change is controlled by a background program, so that the influence of subjective factors caused by self-frequency adjustment of a tested person is avoided, the accuracy of a test result is improved, and the minimum adjustable interval of frequency grading is 0.1Hz, so that the accuracy of the test result is improved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. A flash fusion critical frequency measurement device, comprising: the device comprises a controller, an input unit, a first stroboscopic luminous light source group, a second stroboscopic luminous light source group and a seven-segment digital tube;
the first stroboscopic luminous light source group, the second stroboscopic luminous light source group and the input unit are connected with the controller; the first stroboscopic luminous light source group and the second stroboscopic luminous light source group are positioned in the seven-segment digital tube;
the first stroboscopic luminous light source group and the second stroboscopic luminous light source group are used for displaying numbers;
the input unit is used for a tested person to input an observation result, and the observation result comprises a flashing number, a non-flashing number or no flashing;
the controller is used for controlling the first stroboscopic luminous light source group and the second stroboscopic luminous light source group to randomly display any two numbers from 0 to 9, the two numbers have different luminous frequencies, the number with the lower frequency in the two numbers is completely displayed, and the number with the higher frequency only displays the part which is not overlapped with the number with the lower frequency;
the controller is also used for judging whether the observation result input by the tested person is correct or not.
2. The apparatus for measuring critical frequency of flicker fusion according to claim 1, further comprising a frequency switching unit connected to the controller, wherein the frequency switching unit is configured to convert the light emission frequencies of the first and second stroboscopic light source sets to each other.
3. The apparatus for measuring critical frequency of flicker fusion according to claim 1, further comprising a display connected to the controller, wherein the display is used for displaying the test result of the tested person.
4. The apparatus for measuring critical frequency of flicker fusion according to claim 1, further comprising a warning unit, wherein the warning unit is connected to the controller, and is configured to prompt the monitoring personnel of the uncooperative testing behavior of the tested person, and the uncooperative testing behavior includes numbers other than the numbers formed by the input of the two numbers by the tested person and the display of the two numbers.
5. The apparatus for measuring critical frequency of flicker fusion according to claim 1, further comprising a brightness adjusting unit connected to the first and second stroboscopic light source sets for adjusting brightness of the first and second stroboscopic light source sets.
6. The apparatus for measuring critical frequency of flicker fusion according to claim 1, further comprising a light shielding plate for shielding light from the external environment.
7. A method for measuring a flash fusion critical frequency, applied to the apparatus for measuring a flash fusion critical frequency according to any one of claims 1 to 6, comprising:
acquiring a high frequency and a low frequency;
randomly acquiring any two numbers from 0 to 9, wherein one of the two numbers is displayed at the high frequency, and the other number is displayed at the low frequency;
receiving a flashing number in the two numbers selected by the tested person;
interchanging the light emitting frequencies corresponding to the two numbers;
receiving a flashing digit in the two digits after the frequency selected by the tested person is interchanged;
adjusting the high-frequency or the low-frequency according to the results of the two times of receiving, and skipping to randomly obtain any two digits in 0-9, wherein one of the two digits is displayed with the high-frequency, and the other digit is displayed with the low-frequency;
until receiving the figure that the tested person correctly selects the flashing figure in the two figures twice;
and determining the flash fusion critical frequency of the tested person according to the light emitting frequencies corresponding to the current two numbers.
8. The method for measuring the flicker fusion critical frequency according to claim 7, wherein if the results of the two selections of the tested person are received and are both the two numbers and the numbers other than the numbers combined by the two numbers when the two numbers are simultaneously displayed, the warning unit is used for prompting the testing behavior of the tested person to the monitoring person.
9. The method of claim 7, wherein the initial high frequency or the initial low frequency is adjusted by a dichotomy.
10. The method for measuring critical frequency of flicker fusion according to claim 7, wherein when the two numbers are displayed simultaneously, the result of the simultaneous display is any one of 0 to 9.
CN201911250345.1A 2019-12-09 2019-12-09 Measuring device and method for flash fusion critical frequency Pending CN111297377A (en)

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