CN207502743U - Passive concealed earphone detection device - Google Patents
Passive concealed earphone detection device Download PDFInfo
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- CN207502743U CN207502743U CN201721171272.3U CN201721171272U CN207502743U CN 207502743 U CN207502743 U CN 207502743U CN 201721171272 U CN201721171272 U CN 201721171272U CN 207502743 U CN207502743 U CN 207502743U
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- magnetic field
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- concealed earphone
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Abstract
Passive concealed earphone detection device.The concealed earphone that be used to cheat at one's exam further includes the rare-earth type concealed earphone that a kind of nd-fe-b magnet ferromagnetic material makes, and due to this kind of earphone build very little, is to be worn close to ear-drum, can not effectively be detected.The utility model composition includes the three axial vector magnetic field sensors for measuring external magnetic field tri- axial magnetic field vector components of X/Y/Z under sensor body space three-dimensional orthogonal coordinate system, three axial vector magnetic field sensors described in one group are mounted on different positions or posture in housing, and the three axial vector magnetic field sensors are and controller（3）It is connected by number bus, the controller is connect with alarm module.The utility model is applied to detect passive concealed earphone.
Description
Technical field：
The utility model is related to a kind of passive concealed earphone detection devices.
Background technology：
At this stage, generating self-oscillatory concealed earphone detection device using electromagnetic wave can be by all electron type stealth ear
Machine detects, but the concealed earphone for being used to cheat at one's exam further includes the rare earth that a kind of nd-fe-b magnet ferromagnetic material makes
Type concealed earphone due to this kind of earphone build very little, is to be worn close to ear-drum, can not effectively be detected.
Utility model content：
The purpose of this utility model is to provide a kind of passive concealed earphone detection device.
Above-mentioned purpose is realized by following technical scheme：
A kind of passive concealed earphone detection device, composition include：External magnetic field is measured in sensor body space three-dimensional
The three axial vector magnetic field sensors of tri- axial magnetic field vector components of X/Y/Z, three axial vectors described in one group under orthogonal coordinate system
Magnetic field sensor is mounted on different positions or posture in housing, and the three axial vector magnetic field sensors lead to controller
Number bus connection is crossed, the controller is connect with alarm module.
The passive concealed earphone detection device, the controller are with number bus acquisition capacity and numerical value meter
The chip or module of calculation ability, the controller are connect respectively with display, audio drive circuitry, PWM modulation circuit.
The passive concealed earphone detection device, the alarm module include audio drive circuitry, loudspeaker arrangement,
PWM modulation circuit, LED light, control circuit and vibrating motor.
The passive concealed earphone detection device, the loudspeaker arrangement are connect with the audio drive circuitry, institute
The controller stated is connect with the control circuit, and the control circuit is connect with the vibrating motor, the PWM tune
Circuit processed is connect with the LED light.
The beneficial effects of the utility model：
1. the utility model False Rate is low, high sensitivity is small, can accurately detect the presence of passive concealed earphone.
The operation principle of this passive concealed earphone detection device is as described below：Passive concealed earphone detection device is pacified in inside
In the case of filling Magnetic Sensor of the quantity more than one, moved when from away from object 50cm to be detected to close to object direction to be detected
When, controller adjusts the frequency and indicator light of loud speaker exports audio signal according to the magnetic vector difference that multiple Magnetic Sensors measure
Brightness.
Controller judges whether object to be detected is magnetic material according to following rule：When object to be detected is not magnetic material
During material, 1-n magnetic field vector sensor only measures magnetic-field vector of the earth, each sensor output data one in moving process
It causes；When object to be detected is magnetic material, 1-n magnetic field vector sensor measures magnetic-field vector of the earth in moving process
With the vector sum of magnetic material magnetic vector, each sensor output data has larger inconsistency.Controller is according to 1-n
The inconsistency degree of magnetic field vector sensor data controls the frequency of frequency modulation device.
Magnetic field vector sensor is connect by number bus with main control module.The supplementary module different electricity such as including acoustic-optic indicator
Road, for output invisible earphone result of detection.As shown in Figure 1, passive concealed earphone detector overall structure may include being more than one
Magnetic field vector sensor (N number of magnetic field vector sensor is shown in way)/controller/result of detection output device of a quantity,
In figure with controller according to multiple magnetic field vector sensors to the measurement result of extraneous magnetic vector, control voicefrequency circuit is sent out not
The sound of same frequency and the bright dark degree of indicator light in addition by measurement result digitize show.
Description of the drawings：
Attached drawing 1 is the structure diagram of the utility model.
Attached drawing 2 is the measurement earth's magnetic field principle signal that the utility model installs the different magnetic field vector sensor in two positions
Figure.
Attached drawing 3 is the detection extraneous magnetic field source principle that the utility model installs the different magnetic field vector sensor in two positions
Schematic diagram.In figure, 8 be magnetic material.
Attached drawing 4 is the detection extraneous magnetic field source principle that the utility model installs the different magnetic field vector sensor of two postures
Schematic diagram.
Specific embodiment：
Embodiment 1：
A kind of passive concealed earphone detection device, composition include：External magnetic field is measured in sensor body space three-dimensional
The three axial vector magnetic field sensors of tri- axial magnetic field vector components of X/Y/Z, three axial vectors described in one group under orthogonal coordinate system
Magnetic field sensor is mounted on different positions or posture in housing, the three axial vector magnetic field sensors with controller 3
It is connected by number bus, the controller is connect with alarm module.
Embodiment 2：
According to passive concealed earphone detection device described in embodiment 1, the controller is with number bus acquisition
The chip or module of ability and numerical computation, the controller respectively with display 7, audio drive circuitry, PWM modulation
Circuit connects.
Embodiment 3：
Passive concealed earphone detection device according to embodiment 2, the alarm module include audio drive circuitry
4th, loudspeaker arrangement 5, PWM modulation circuit, LED light 6, control circuit and vibrating motor.The loudspeaker arrangement with it is described
Audio drive circuitry connects, and the controller is connect with the control circuit, the control circuit and the vibration
Motor connects, and the PWM modulation circuit is connect with the LED light.
Embodiment 4：
Passive concealed earphone detection device according to embodiment 1 or 2 or 3, passive concealed earphone detection device include
The different magnetic field vector sensor of one or more installation sites or Installation posture has data acquisition and the control of processing function
Device processed, and include the supplementary module with acoustic-optic indicator.
As shown in Fig. 2, two position different magnetic field vector sensors of installation inside a kind of passive concealed earphone detection device,
Sensor (1) is with sensor (2) at a distance of 10cm.Except magnetic material magnetic fields range, sensor (1) and sensor (2)
Only measure magnetic-field vector of the earth.Since in local space, earth magnetic field can be approximately parallel magnetic vector space, therefore sense
The measurement result of device (1) sensor (2) output is unit direction and the magnetic field intensity of magnetic vector that is identical namely measuring
It is identical.
As shown in figure 3, two position different magnetic field vector sensors of installation inside a kind of passive concealed earphone detection device,
Sensor (1) is with sensor (2) at a distance of 10cm.Within the scope of magnetic material magnetic fields, sensor (1) sensor (2) is surveyed
Measure the resultant vector to earth magnetic field and magnetic material magnetic field, due to magnetic material magnetic vector in its sphere of action from N
S poles are directed toward in pole, and the magnetic vector has curl in local space, therefore can cause the conjunction in magnetic material magnetic fields space
Into the variation of magnetic vector, therefore, moving process of the magnetic field sensor (1) (2) in this section of space, output measurement data changes
Acutely.
As shown in figure 4, being installed inside a kind of passive concealed earphone detection device, two postures are different but relative distance is smaller
Magnetic field vector sensor when, according to fig. 2 to state content, the external magnetic field vector that sensor (1) and (2) measure.When only
In the presence of magnetic-field vector of the earth, when the passive concealed earphone detection device described in this patent is moved with non-rotating posture, sensor
(1) and (2) export external magnetic field unit vector direction and significant change does not occur for intensity；It is passive when the external world is there are during magnetic material
Headset detecting device moves in the same manner, and the external magnetic field direction vector and intensity that sensor (1) and (2) are obtained occur bright
Aobvious variation.
Claims (3)
1. a kind of passive concealed earphone detection device, composition includes：Measure external magnetic field in sensor body space three-dimensional just
The three axial vector magnetic field sensors of tri- axial magnetic field vector components of X/Y/Z under coordinate system are handed over, it is characterized in that：Three described in one group
Axial vector magnetic field sensor is mounted on different positions or posture in housing, the three axial vector magnetic field sensors with control
Device processed is connected by number bus, and the controller is connect with alarm module；
The controller is the chip or module for having number bus acquisition capacity and numerical computation, the controller
It is connect respectively with display, audio drive circuitry, PWM modulation circuit.
2. passive concealed earphone detection device according to claim 1, it is characterized in that：The alarm module includes raising one's voice
Device, LED light, control circuit and vibrating motor.
3. passive concealed earphone detection device according to claim 2, it is characterized in that：The loudspeaker arrangement with it is described
Audio drive circuitry connects, and the controller is connect with the control circuit, the control circuit and the vibration
Motor connects, and the PWM modulation circuit is connect with the LED light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721171272.3U CN207502743U (en) | 2017-09-13 | 2017-09-13 | Passive concealed earphone detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721171272.3U CN207502743U (en) | 2017-09-13 | 2017-09-13 | Passive concealed earphone detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207502743U true CN207502743U (en) | 2018-06-15 |
Family
ID=62498664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721171272.3U Active CN207502743U (en) | 2017-09-13 | 2017-09-13 | Passive concealed earphone detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207502743U (en) |
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2017
- 2017-09-13 CN CN201721171272.3U patent/CN207502743U/en active Active
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