CN105866846A - Hand-held iron weapon detector - Google Patents

Abstract

The invention discloses a hand-held iron weapon detector, which comprises a main body structure, a host, a transmitting coil and a receiving coil, wherein the transmitting coil and the receiving coil are connected with the host, and the hand-held iron weapon detector is characterized in that: the host also comprises a phase characteristic acquisition module, an alarm database, a judgment module and an alarm module; the phase characteristic acquisition module is connected with the receiving coil and used for acquiring a phase characteristic value detected when the measured object passes through the induction area of the receiving coil; the alarm database stores an iron weapon phase characteristic table; the judging module is used for searching the iron weapon phase characteristic table of the alarm database, judging whether the phase characteristic value R of the measured object meets the judging condition in the iron weapon phase characteristic table or not, and sending a suspected signal if the phase characteristic value R of the measured object meets the judging condition in the iron weapon phase characteristic table; and the alarm module is used for receiving the suspected signal. By using the iron weapon detector, the inspection time is shortened, and the detection efficiency is improved.

Description

A hand-held iron weapon detector

technical field

The invention relates to the field of metal detection, in particular to a hand-held iron weapon detection device.

Background technique

For security reasons, metal detectors are widely used in urban subways, railway stations, large-scale event sites, etc. The purpose is to detect whether people are carrying prohibited iron weapons, such as iron knives and guns. Current metal detectors can only detect whether people carry metal, but cannot distinguish whether people carry iron or metal products. Most guns and knives contain iron components, which can be distinguished from the daily use items on the human body that are generally made of other metals such as copper and aluminum.

In addition, the detection device needs to be convenient for the detection personnel to carry around, so as to solve the problem that the detection personnel cannot inspect during the patrol process. To sum up, the current market urgently needs a hand-held iron weapon detector, which can detect iron weapons more accurately. , and reduce the probability of false positives.

Contents of the invention

The task of the present invention is to overcome that metal detectors have been unable to classify and detect iron weapons, and to provide a hand-held iron weapon detector that is different from the daily-use items generally made of metal materials such as copper and aluminum, including a main structure , a host and a transmitting coil and a receiving coil connected thereto, characterized in that: the host also includes a phase feature acquisition module, an alarm database, a judging module and an alarm module; the phase feature acquisition module is connected to the receiving coil for obtaining the measured The phase characteristic value detected when the object passes through the sensing area of the receiving coil; the phase characteristic table of iron weapons is stored in the alarm database; the judgment module is used to search the phase characteristic table of iron weapons in the alarm database, and judge the phase characteristics of the measured object Whether the value R meets the judgment conditions in the iron weapon phase feature table, if it meets the judgment conditions in the iron weapon phase feature table, a suspected signal is sent; the alarm module is used to receive the suspected signal.

Preferably, the determination condition is: the difference between the phase characteristic value R of the measured object and the phase characteristic value T of the iron weapon calibration object in the iron weapon phase characteristic table is within a preset range.

Preferably, the determination condition is: the phase characteristic value R-Z of the measured object based on the reference point is within the range of the phase characteristic value of the iron weapon calibration object based on the reference point calibration object, and Z is the phase characteristic value of the reference point calibration object.

Preferably, the iron weapon phase characteristic table stores the phase characteristic value of the reference point calibration object.

Preferably, the fiducial is metal.

Preferably, the phase feature value range of the iron weapon calibration object based on the reference point calibration object is pre-input into the iron weapon phase feature table.

Preferably, the phase characteristic value range of the iron weapon calibration object based on the reference point calibration object is not greater than 360°.

Preferably, the alarm module is also used to remind staff to check manually after receiving a suspicious signal.

Preferably, the iron weapon detector further includes a phase shifter for adjusting the phase of the output signal of the receiving coil.

Using the hand-held iron weapon detector provided by the present invention solves the problem of classification and detection of iron weapons, and detects whether there are suspected iron weapons on the person under test, which is different from the general use of copper, aluminum and other metal materials. daily use items, shorten the inspection time, carry it with you, and improve the detection efficiency.

Description of drawings

Fig. 1 is the schematic diagram of hand-held iron weapon detector of the present invention;

Fig. 2 is the block diagram of the first embodiment of the handheld iron weapon detector of the present invention;

Fig. 3 is a block diagram of the second embodiment of the handheld iron weapon detector of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited to the scope described in the embodiments.

The iron weapon detector in the present invention refers to a device for detecting whether there is an iron weapon object hidden in the measured object or on the measured person.

Iron weapon of the present invention can be knife, grabs etc. are made of iron metal.

Referring to Fig. 1 and Fig. 2, Fig. 1 is a block diagram of the first embodiment of the handheld iron weapon detector of the present invention. Fig. 2 is a block diagram of the first embodiment of the handheld iron weapon detector of the present invention. The hand-held iron weapon detector of the present invention includes a main body structure 101, a host 102 and a transmitting coil 103 and a receiving coil 104 connected thereto, and is characterized in that: the host 102 also includes a phase feature acquisition module 201, an alarm database 202, a judgment Module and 203 alarm module 204; Phase feature acquisition module 201 is connected to receiving coil 104, is used to obtain the phase feature value detected when the measured object passes through the sensing area of receiving coil 104; There are iron weapon phase features in the alarm database 202 Table; judging module 203, for searching the iron weapon phase feature table of alarm database 204, judging whether the phase feature value R of the measured object meets the judgment condition in the iron weapon phase feature table, if it meets the iron weapon phase feature table The judgment condition in the system sends out a suspected signal; the alarm module is used to receive the suspected signal.

According to Maxwell's electromagnetic field theory, when the excitation signal is transmitted from the transmitting coil 103 and propagates through the air, the receiving coil 104 will have induced current and induced electromotive force. In particular, when there are iron weapons or metal objects near the transmitting coil 103 or the receiving coil 104 , an eddy current effect will be generated, thereby affecting the induced current and the induced electromotive force generated by the receiving coil 104 . Specifically, the receiving coil 104 is connected to the phase characteristic acquisition module 201, and the phase characteristic acquisition module 201 analyzes the output waveform of the receiving coil 104, extracts the waveform phase, and obtains the phase characteristic value T. Due to the error of the test, the phase characteristic value T is obtained by taking the average value of multiple measurements.

Preferably, the determination condition is: the difference between the phase characteristic value R of the measured object and the calibration object phase characteristic value T in the iron weapon phase characteristic table is within a preset range. Specifically, the phase characteristic value T of the iron weapon calibration object is stored in the iron weapon phase characteristic table, and the phase characteristic value R and T of the measured object are compared one by one. It is judged that the difference between the phase characteristic value R of the measured object and the phase characteristic value T of each calibration object is within the preset range, and if the difference is within the preset range, the measured object is listed as a suspected object. The preset range can be set according to the needs of the user in the actual use process, and the size of the preset range determines the degree of tolerance when testing the measured object.

It should be understood that based on the same hardware detection equipment and the same frequency of the transmitting coil 103 excitation signal such as 5360Hz, the phase characteristic value T is related to the composition of the measured object, therefore, the phase characteristic value T of the specific iron weapon calibration object is fixed, But for different receiving coils 104 , due to the difference in their analog characteristics, the measured phase characteristic value T of the iron weapon calibration object is different through different receiving coils 104 . The iron weapon phase signature table is determined for this iron weapon detector. How to obtain the iron weapon phase feature table corresponding to the iron weapon detector will be described in detail later.

The phase eigenvalues of iron weapons are affected by the iron components in their iron weapons, and multiple iron weapons will have a phase eigenvalue range; secondly, iron daily necessities cannot be distinguished from iron weapons; in addition, iron and stainless steel alloys For metals, the range of phase eigenvalues will have intersections. Therefore, through the above scheme, it is possible to screen suspected iron weapons first, and then conduct further inspections to improve the efficiency of inspections.

Preferably, the determination condition is: the phase characteristic value R-Z of the measured object based on the reference point is within the range of the phase characteristic value of the iron weapon calibration object based on the reference point calibration object, where Z is the phase characteristic value of the reference point calibration object. In this scheme, most of the iron weapons are detected to obtain their phase characteristic values to form experimental data and recorded in the iron weapon phase characteristic table. For example, if the phase eigenvalue of the measured object based on copper is 30°, and the experiment has known that the phase eigenvalue of the iron weapon based on the copper calibration object is 10° to 80°, then the determination condition is considered to be met. Through the above scheme, suspected items can be screened first, and then further inspection can be performed to improve the efficiency of inspection.

Preferably, the iron weapon phase characteristic table stores the phase characteristic value of the reference point calibration object. The fiducials may be metal. The reference point calibration object should have a stable phase characteristic value, as 0 point, any object has a fixed difference with respect to a certain reference point calibration object. In the iron weapon phase feature table, the phase feature values of iron weapons based on multiple reference point calibration objects can be stored. The use of metal as the reference point calibration object has easy unified standards and is conducive to popularization.

Preferably, the phase feature value range of the iron weapon calibration object based on the reference point calibration object is pre-input into the iron weapon phase feature table. Specifically, the phase characteristic value of the iron weapon based on the copper calibration object is 10° to 80°, which is pre-input into the iron weapon phase characteristic table, preferably, saved in the form of a file, and directly stored in different iron weapon detectors transfer.

Preferably, the phase characteristic value range of the iron weapon calibration object based on the reference point calibration object is not greater than 360°. Angle system standard is adopted, and the phase eigenvalue range is not greater than 360°. Using the radian system standard, the phase eigenvalue range is not greater than 2π.

Further, the alarm module 204 is also used to remind the staff to check manually after receiving the suspected signal. There are various reminder methods, such as displaying abnormal symbols on the display screen, issuing warning sounds through speakers, and flashing lights. Manual inspection can use X-ray machine or naked eye inspection.

The following provides a scheme for writing iron weapons and corresponding phase feature values into the iron weapon phase feature table.

Pass the iron weapon calibration object through the sensing area of the receiving coil 104 of the iron weapon detector. In particular, in the process of calibrating iron weapon calibration objects, automatic methods such as manipulators can be used instead of manual operations, and the iron weapon calibration objects can be passed through the sensing area of the receiving coil 104 of the pass-through detector, which can achieve fast and accurate detection. Effect. The sensing area of the receiving coil 104 refers to the area where the measured object can affect the induced electromotive force generated by the receiving coil 104 . In the hand-held detector 300 , the iron weapon calibration object is placed close to the sensing area of the receiving coil 302 .

According to the needs of the actual situation, there can be M iron weapon calibration objects, and M is a natural number greater than 1.

Write the phase characteristic value T and the serial number of the iron weapon calibration object into the iron weapon phase characteristic table in the alarm database 202 . For example, if there are M iron weapon calibration objects, then, the phase characteristic value of the mth iron weapon calibration object is expressed as Tm, and the phase characteristic value T and the iron weapon calibration object are recorded in the iron weapon phase characteristic table. number.

In order to make each iron weapon detector have a unified iron weapon phase feature table, a reference point calibration object phase feature value can be set, and the reference point calibration object can be a metal object. Calculate T-Z, that is, obtain the phase characteristic value t of the iron weapon calibration object based on the reference point calibration object; the phase characteristic value t and the serial number of the iron weapon calibration object are stored in the iron weapon phase characteristic table in the alarm database 202 . And the minimum value to the maximum value of the phase characteristic value of the iron weapon calibration object based on the reference point calibration object can be set as the phase characteristic value range of the iron weapon calibration object based on the reference point calibration object.

The following provides a solution for calibrating different iron weapon detectors to make the detection phase eigenvalues uniform, which can be divided into software methods and hardware methods.

In the software mode, pass the same calibration object through the detection area of the receiving coil 104 of two different iron weapon detectors, and obtain the phase eigenvalues Z and Y corresponding to the first and second iron weapon detectors of the calibration object, Calculate the correction value Y-Z of the second iron weapon detector corresponding to the first iron weapon detector. On the one hand, the correction value is used to correct the difference in phase feature detection between the receiving links of the two iron weapon detectors, that is, after Y-Z correction is performed on the test results of the second iron weapon detector, the second iron weapon detector can be The iron weapon detector is regarded as a device having the same phase signature detection performance as the first iron weapon detector. On the other hand, the phase characteristic value obtained when the calibration object passes through the second iron weapon detector can be corrected by the correction value to obtain the phase characteristic value obtained when the calibration object passes through the first iron weapon detector The data with consistent values means that the phase eigenvalues corresponding to different iron weapon detectors are unified. The unified phase feature value is beneficial to the unification and migration of the phase feature table of iron weapons.

In the hardware mode, please refer to FIG. 3 , which is a block diagram of the second embodiment of the handheld iron weapon detector of the present invention. The iron weapon detector also includes a phase shifter 205 for adjusting the phase of the output signal of the receiving coil 104 . Specifically, for example, a first iron weapon detector and a second iron weapon detector are provided, and the phase shifter 205 in the second iron weapon detector is adjusted so that the iron weapon calibration object passes through the first iron weapon detector. The phase eigenvalues detected when the iron weapon calibrator passes through the iron weapon detector are the same. The phase shifter 205 is connected to the receiving coil 104 and the phase feature acquisition module 201 to adjust the phase of the output signal of the receiving coil 104 of the second iron weapon detector. By controlling the size of the phase shift of the phase shifter 205, and simultaneously detecting the phase eigenvalue of the iron weapon calibration object passing through the second iron weapon detector, the phase eigenvalue and the iron weapon calibration object pass through the first iron weapon detection The same is true for the device. The phase shifter 205 is controlled by a control signal, which can be sent by the host, and the tester can further control the operation of the phase shifter 205 by adjusting the phase shift parameters on the host. In addition, regarding the method of adjusting the phase shift size of the phase shifter 205, the size of the potentiometer 205 of the phase shifter can also be adjusted manually to control the phase shift size of the phase shifter 205 until the iron weapon calibration object passes through the first The phase eigenvalues detected when the iron weapon detector and the calibration object pass through the second iron weapon detector are the same. Through the above phase shifter correction method, the second iron weapon detector can be regarded as a device with the same phase feature detection performance as the first iron weapon detector, which is conducive to the compatibility and unity of the phase feature table data, It is convenient to migrate among different iron weapon detectors or to solve the problem that the phase eigenvalues are not uniform due to the different simulation characteristics of the receiving coils of multiple iron weapon detectors.

The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, but should also cover the technical solution formed by the above-mentioned technical features without departing from the inventive concept. Other technical solutions formed by any combination of or equivalent features thereof. For example, a technical solution formed by replacing the above-mentioned features with technical features with similar functions disclosed in (but not limited to) this application.

Claims (9)

1. A hand-held iron weapon detector, comprising a main structure, a host and a transmitting coil and a receiving coil connected thereto, characterized in that: the host also includes a phase feature acquisition module, an alarm database, a judgment module and an alarm module The phase feature acquisition module is connected to the receiving coil to obtain the phase feature value detected when the measured object passes through the sensing area of the receiving coil; the phase feature table of iron weapons is stored in the alarm database; the judgment module is used to search the alarm database Iron weapon phase feature table, judge whether the phase feature value R of the measured object meets the judgment conditions in the iron weapon phase feature table, if it meets the judgment conditions in the iron weapon phase feature table, a suspected signal is sent; the alarm module, Used to receive suspicious signals. 2. The hand-held iron weapon detector according to claim 1, characterized in that: the determination condition is: the phase characteristic value R of the measured object and the phase characteristic value of the iron weapon calibration object in the iron weapon phase characteristic table The difference of T is within a preset range. 3. The hand-held iron weapon detector according to claim 1, characterized in that: the determination condition is: the phase characteristic value R-Z of the measured object based on the reference point is greater than that of the iron weapon calibration object based on the reference point calibration object. Within the phase eigenvalue range, Z is the phase eigenvalue of the reference point calibration object. 4. The hand-held iron weapon detector according to claim 3, characterized in that: the iron weapon phase characteristic table stores the phase characteristic value of the reference point calibration object. 5. The handheld iron weapon detector according to claim 4, characterized in that: the reference point calibration object is metal. 6. The hand-held iron weapon detector according to claim 3, characterized in that: the phase feature value range of the iron weapon calibration object based on the reference point calibration object is pre-input into the iron weapon phase feature table. 7. The hand-held iron weapon detector according to claim 6, characterized in that: the phase characteristic value range of the iron weapon calibration object based on the reference point calibration object is not greater than 360°. 8. The hand-held iron weapon detector according to any one of claims 1-7, characterized in that: the alarm module is also used to remind staff to check manually after receiving a suspicious signal. 9. The handheld iron weapon detector according to claim 8, characterized in that: the iron weapon detector further comprises a phase shifter for adjusting the phase of the output signal of the receiving coil.