KR20010017556A - A gate type metal detctor - Google Patents

Abstract

PURPOSE: A gate type metal detector is provided to exactly regulate a detect sensitivity, to calculate the number passing through a gate, and to reduce a wrong operation. CONSTITUTION: A gate type metal detector comprises a pulse generator(112) generating 60Hz pulse wave from an applied 60Hz sinusoidal wave; a one chip micro processor A(114) applying a specific frequency to a transmission coil(116) and outputting information on a pulse signal of an adjacent detector; a pulse decoder(126) decoding the pulse received in receiving coils(118,119) and outputting the pulse to the one chip microprocessor A; a one chip microprocessor B(124) controlling an alarm device according to a comparison result of a comparator(122) and the information on an adjacent detector pulse signal. Even though other metal detectors are near, a metal is detected regardless of the signals from the other detectors.

Description

A gate type metal detctor

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to metal detectors, and more particularly, to gate type metal detectors used to inspect whether a person who enters or exits a predetermined place has metal such as illegal weapons.

In general, metal detectors are used for a specific purpose to prevent the import and export of prohibited articles, and are mainly installed in government agencies, airports, businesses and stores.

In general, a gate type metal detector is an arch formed gate formed by crossing bridges on top of two panels placed on both sides of the wall. Is done.

One of the two panels, which are both side walls of the gate, is provided with a transmission coil for transmitting electromagnetic waves of a specific frequency, while the other is equipped with a receiving coil for receiving electromagnetic waves transmitted from the transmission coil before and after the other panel. In the sieve console, the signal received from each receiving coil is compared to detect the change, so that a person who passes through the gate detects prohibited items of metals carried by the person and generates an alarm signal.

However, the above-described detection method of the metal detector is caused by the variation of the received electromagnetic wave, and since the metal detector is affected by the electromagnetic wave generated by the adjacent detector, the wireless device, the motor, etc. In the case of carrying a telephone, a false alarm is likely to occur when a metal detector is installed in an adjacent position.

An object of the present invention is to provide a gate-type metal detector that can accurately adjust the detection sensitivity, count the number of people passing through the gate, as well as reduce the malfunction caused by interference, in particular, adjacent metal detectors. have.

1 is a block diagram of a gate type metal detector according to the present invention,

2 is a perspective view of a gate type metal detector according to the present invention;

3 is an external perspective view of a console shown in a related configuration of the present invention;

4 is a rear perspective view of the gate shown in the embodiment according to the present invention.

Explanation of symbols on the main parts of the drawings

A: display panel 100: gate type metal detector

102: gate 112: pulse generator

114: one-chip microprocessor A 116: transmission coil

118, 119: receiving coil 120, 121: amplifier

122: comparator 124: one-chip microprocessor B

126: pulse reader 128: nonvolatile memory

130: alarm means 131: alarm volume control

132: bar graph indicator 133: sensitivity controller

134: decoder B 135: numeric display

136: decoder A 137: sensitivity indicator

138: red lamp 139: green lamp

140: photo sensor PD: infrared light emitting diode

PTR: Infrared Receiver

An object of the present invention is a gate consisting of a bridge connecting the upper end of the receiving panel and the transmission panel and the transmission panel spaced apart from the transmission panel, the transmission coil is installed on the transmission panel for transmitting electromagnetic waves of a specific frequency, front and rear of the reception panel A gate type for detecting a metal passing through the gate, having two receiving coils respectively installed to receive electromagnetic waves of the transmitting coil, an amplifier for amplifying the signals of the two receiving coils, and a comparator comparing the signals input through the amplifier. In the metal detector, a pulse generator generates a 60 Hz pulse wave by receiving a 60 Hz sine wave from a predetermined commercial power supply, and generates a signal of a specific frequency using a 60 Hz pulse wave applied from the pulse generator and applies the signal to a transmission coil. One-chip microprocessor A for outputting information on the pulse signal of the proximity detector, etc. according to the input signal, One-chip microprocessor that controls the alarm means according to the result of comparison in pulse reader and comparator that reads the pulse received at the receiving coil and outputs it to one-chip microprocessor A and the pulse signal of adjacent detector applied from one-chip microprocessor A. It consists of a configuration including B.

A one-chip microprocessor, comprising a photo sensor installed at the gate to generate a detector signal for a passerby, a decoder B for converting a BCD signal to a seven segment signal, and a seven-segment number indicator for numerically displaying the output of the decoder B. It is preferable to configure B to introduce a detection signal from the photosensor, to count the number of passers, to output the counted result as a BCD signal and to transmit it to the decoder B.

The display panel with the above alarm means, bar graph indicator, and 7-segment number display is installed at a predetermined position on the back of the gate, and it is composed of sensitivity controller for controlling sensitivity, decoder A for decoding sensitivity signal, and decoded sensitivity. It is more preferable that the configuration further includes a sensitivity indicator for displaying a signal and a bar graph indicator for indicating the magnitude of the detected metal.

When the pulsed reception signal output from the comparator is read by the pulse reader and applied to the one-chip microprocessor A, the one-chip microprocessor A transfers the pulse read data to the one-chip microprocessor B by the data programmed in the internal program memory. It is more preferable to prevent malfunction due to mutual interference by the respective arched metal detectors even when two or more arched metal detectors are operated in close proximity at the same place by processing the received pulse data to be input in time. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a gate metal detector according to the present invention, Figure 2 is a perspective view of a gate metal detector according to the present invention.

As shown, the gate type metal detector 100 according to the present invention includes a pulse generator 112. The pulse generator 112 receives a 60 Hz sine wave from a commercial power source used as a power source and generates a 60 Hz pulse wave to be applied to the one-chip microprocessor A 114. The one-chip microprocessor A 114 generates a signal of a specific frequency using a 60 Hz pulse wave applied from the pulse generator 112 and applies it to the transmission coil 116, and also according to a predetermined input signal, the adjacent detector or the portable radio. Outputs information about pulse signals, such as a telephone.

Meanwhile, the transmission coil 116 provided on one sidewall of the gate 102 generates electromagnetic waves by pulse waves of a specific frequency applied by the one-chip microprocessor A 114, and the electromagnetic waves are generated on the other side wall of the gate 102. The two receiving coils 118 and 119 respectively installed at the front and the rear are respectively sensed. The transmission coil 116 receives an induced current for generating an electric magnetic field by the one-chip microprocessor A 114 providing a pulse wave of a specific frequency, and is turned on and off by the one-chip microprocessor A 114.

The signals of the two receiving coils 118 and 119 are amplified by the amplifiers 120 and 121, respectively, and applied to the comparator 122. The comparator 122 compares the amplified signals to the one-chip microprocessor B 124 and the pulse reader. Output to (126). The output signal of the comparator 122 is applied to the one-chip microprocessor B 124 in which the AD conversion element is embedded and the program memory is embedded, and the signal is processed according to the pre-programmed information, that is, data and control with each component. Send a signal The result is always stored in the nonvolatile memory 128, and according to the output signal of the one-chip microprocessor B 124, the warning signal for the metal detection is sent to the output of the one-chip microprocessor B 124 by the alarm means 130. Accordingly, the magnitude of the detection metal is indicated by the bar graph indicator 132 at the level.

In addition to this configuration, the photo sensor 140 is installed to detect a passerby of the gate to generate a signal, and the one-chip microprocessor B 124 introduces a detection signal from the photosensor 140 to count the passerby. And outputting the result of the counting as a BCD signal, and further comprising a decoder B134 for converting the BCD signal into a 7-segment signal and a 7-segment numeric indicator 135 for displaying the output of the decoder B 134 numerically. . In addition, the alarm volume controller 131 for adjusting the volume of the alarm means 130, the sensitivity controller 133 for sensitivity adjustment, the decoder A (136) for decoding the sensitivity signal, the sensitivity to display the decoded sensitivity signal The indicator 137 is further provided. In addition, the photosensor 140 transmits infrared light modulated at a predetermined frequency using an infrared light emitting diode (PD) as an infrared element, and receives infrared light modulated at a predetermined frequency using an infrared light receiving transistor (PTR). In this way, the light incident on the infrared light receiving transistor PTR is sensed to be blocked by the passer-by.

Since a predetermined frequency is modulated to an infrared wavelength and transmitted and received so as not to be affected by infrared rays included in sunlight or electric light, a description thereof will be omitted.

The nonvolatile memory 128 uses an EEPROMized device to describe the state data of the adjusted detection sensitivity and the beep volume and the data of which the pass-through is counted by the one-chip microprocessor B 124 as described above. Whenever there is a person who passes through the infrared photo sensor 140, the one-chip microprocessor B (124) is always stored in the nonvolatile memory 128, so that the state data before the power failure or before the operation stop when re-use after power failure or operation stop. It is configured to restart.

In addition, since the alarm means 130 uses a buzzer for generating an alarm sound or a red lamp 138 for generating an alarm light at the same time, the user's judgment can be fully determined regardless of the use environment of the metal detector. In addition, it is preferable to install a green light 139 to indicate that there is no metal detected and is in normal operation.

Alarm volume controller 131 of the figure is composed of two control switches, one switch is a switch for adjusting the alarm size is adjusted to the upper size of the alarm size of eight steps each time, the other switch is pressed The alarm size is downwardly adjusted at each press, and the adjusted state data is always stored in the nonvolatile memory 128 by the one-chip microprocessor B 124.

Sensitivity adjuster 133 of the drawing consists of a sensitivity indicator 133 consisting of two 7-segment that can display up to 10 units, sensitivity control can adjust the sensitivity in 100 steps up to 0-99, Each time the left switch of 133 is pressed once, the sensitivity is adjusted upward by one, and the adjusted state is displayed numerically on the sensitivity indicator 137, and the adjusted sensitivity state data is transferred to the one-chip microprocessor B (124). Is always stored in the nonvolatile memory 128, and the sensitivity is adjusted downward by 1 each time the right switch of the sensitivity controller 133 is pressed once, and the adjusted state data is always nonvolatile by the one-chip macroprocessor B 124. Always stored in the memory 128, the last adjusted sensitivity state is set in a recovery state after a power failure or a restart state after a shutdown, and the arcuate metal detector of the present invention enters into operation.

As shown in FIG. 2, the panel 103 in which the transmitting coil 116 and the infrared light emitting diode PD of the photosensor 140 are installed, and the two receiving coils 118 and 119 are spaced apart from each other and the photosensor 140 is installed. Panel 104 is installed to form both side walls of the gate 102, the bridge 105 is assembled on the upper panel of the two panels (103, 104) to form an arched gate ( 102). When a pedestrian passes through the gate 102 with the metal corresponding to the prohibited article, the electric power sensed by the receiving coil 119 installed in front of the panel 104 and the receiving coil 118 installed behind the panel 104. The magnetic field is different.

3 is an external perspective view of a console shown in a related configuration of the present invention, which is provided separately from the gate 102 and includes circuits such as the amplifiers 120 and 121, the comparator 122, and the one-chip microprocessor B 124. In front of the console 150, the alarm means 130, and 7 segment number indicator 135, bar graph indicator 132, sensitivity controller 133, power switch (S1), reset switch (S2), The alarm size regulator 131 is installed. In addition, a lock device 156 is installed on the front of the console 150 so that all the switches (S1, S2), sensitivity controller 133 is not arbitrarily adjusted.

S2 is a system initialization switch when the switch is input by the one-chip microprocessor A (114), the one-chip microprocessor B (124) recognizes all the operation is restarted after restarting the operation, the green lamp 139 of Figure 1 Is an indicator lamp to indicate that the passer-by has not carried the prohibited article.

Figure 4 is a rear perspective view of the gate shown in accordance with an embodiment of the present invention, the alarm means 130, bar graph indicator 132 and 7 segment number indicator 135 is disposed. It is shown that the display panel A is installed on one side of the bridge 105 forming the upper portion of the gate 102. With this configuration, it is not necessary to arrange separate personnel in the console 150 and the gate 102, and by monitoring the rear surface of the gate 102, the recognition of the information signal and the coefficient of personnel are possible, and the passerby of the gate 102 This is useful when you need to double check visually. In addition, the present invention can simplify the structure of the console 150 by placing both circuit components and key input means on the gate 102.

Referring to the operation, first, as the device is turned on, the one-chip microprocessor B 124 performs self-diagnosis according to a program stored in the program memory inside the one-chip microprocessor B 124 for a predetermined short time. If the diagnosis result is abnormal, the power is automatically reconnected and the self-diagnosis is performed again. When abnormality is detected as a result of the self-diagnosis, the program information is checked. If there is no abnormality as the self-diagnosis result, a sine wave of 60 Hz is applied from a commercial power supply, and the pulse generator 112 generates a 60 Hz pulse wave. One chip microprocessor A 114 generates a specific frequency to transmit an electromagnetic wave in the form of a pulse wave corresponding to the specific frequency from the transmission coil 116.

On the other hand, the two receiving coils 118 and 119 receive the transmitted electromagnetic waves, respectively, and continuously form a pulse-shaped electric magnetic field by the received electromagnetic waves, and the comparator 122 is formed by the two receiving coils 118 and 119. The level of the electric magnetic field is compared to each time slot and applied to the one-chip microprocessor A 124, and simultaneously, the amplified signal is sent to the pulse reader 126. The pulse reader 126 reads an amplified pulse type electric magnetic field signal, reads the degree of disturbance by an adjacent metal detector or the like, and sends the information to the one-chip microprocessor A 114. Then, the one chip microprocessor A 114 outputs the information about the pulse signal such as the neighbor detector to the one chip microprocessor B 124 according to the signal input from the pulse reader 126.

The one-chip microprocessor B 124 receives the received pulse data input from the comparator 122 according to the information on the pulse signal by the adjacent detector applied from the one-chip microprocessor A 126 and the comparison result applied from the comparator 122. To determine whether metal is brought in by processing the time difference, and generates an alarm signal through the alarm means 130 according to the determination result, and emits a red lamp 138 or lights a green lamp 139 which is a passing signal. It indicates normality, counts passers, continuously determines if metal detection operation is needed, generates an interrupt accordingly, returns to metal detection mode, circulates, turns off the power while counting the number of passers-by. You are done.

The photo sensor 140 installed in the gate 102 detects infrared rays blocked by the passer-by and generates a signal indicating that the passer-by is passing. Accordingly, the one-chip microprocessor B 124 has information programmed in the microprocessor internal program memory. It operates according to the signal of the photosensor 140 is input once, counts and outputs the result as a BCD code, this BCD code is converted into a 7-segment signal at the decoder B 134 and the number of 7 segment number indicator 135 By driving), the passing number is displayed numerically. The operation of counting the number of people passing through is not related to the carrying of prohibited articles.

At this time, if the person passing through the gate 102 carries a metal corresponding to the prohibited article, the level of the signal of the two receiving coils (118, 119) for detecting the electric field generated in the transmission coil 116 is different from each other. This weak level difference is amplified by the amplifiers 120 and 121, and the difference becomes larger. The level difference of the signal is determined by the comparator 122 and input as the input data of the one-chip microprocessor B 124. do.

Accordingly, the one-chip microprocessor B 124 drives the alarm means 130 by the information programmed in advance in the program memory inside the one-chip microprocessor to generate an alarm signal with sound and light, thereby preventing the operator from passing through. Make sure you're carrying your items.

Sensitivity adjustment of the metal detection which can be searched by adjusting the sensitivity controller 133 while looking at the bar graph indicator 132 provided in the console 150 or the gate 102 starts with a high sensitivity setting for detecting all prohibited items. It is preferable to set while gradually lowering until the desired detection rate is reached. However, the adjustment of the best sensitivity level to detect only metals that are prohibited articles is recommended to start at the lowest sensitivity and increase in steps by time, usually in the case of non-urgent.

In order to prevent the one-controlled state from being randomly changed by others, the locking device 156 may be locked in the same manner as described above.

As can be seen from the above description, the gate-type metal detector according to the present invention also has a function of self-diagnosis for the count and operation of the number of passers-by, preventing malfunction of the device, and counting the number of notices at the gate 102 and By directly displaying the alarm status and the like, the visibility is not only improved, but also the management of the operator is convenient, and even when it is necessary to check the pedestrian with the naked eye, it is possible to fully operate with one person.

The memory for storing the information of the program and the information to be processed does not lose data even during a power failure by using a nonvolatile memory device (EEPROM).

Locking device is provided to block the input of information, so that once adjusted status such as sensitivity adjustment and alarm volume adjustment can be prevented from being randomly changed.

In particular, even if there are other metal detectors in the adjacent position, the malfunction rate is remarkably low since the metal can be detected without being influenced by signals generated from other detectors.

Claims (4)

A gate consisting of a transmission panel and a receiving panel spaced apart from the transmitting panel and a bridge connecting the upper end of the receiving and receiving panel, a transmitting coil installed on the transmitting panel to transmit electromagnetic waves of a specific frequency, and installed in front and rear of the receiving panel, respectively. A gate type for detecting a metal passing through the gate, having two receiving coils for receiving the electromagnetic waves of the transmission coil, an amplifier for amplifying the signals of the two receiving coils, and a comparator comparing the signals input through the amplifiers In metal detectors, A pulse generator for generating a 60 Hz pulse wave by receiving a 60 Hz sine wave from a predetermined commercial power supply; A one-chip microprocessor A for generating a signal of a specific frequency using a 60 Hz pulse wave applied from the pulse generator, applying the signal to the transmission coil, and outputting information on a pulse signal such as an adjacent detector according to a predetermined input signal; A pulse reader for reading the pulse received by the receiving coil and outputting the pulse to the one chip microprocessor A; And And a one-chip microprocessor B for controlling the alarm means according to the comparison result of the comparator and the information on the pulse signal of the neighbor detector applied from the one-chip microprocessor A. The apparatus of claim 1, further comprising a photosensor installed at the gate to generate a detection signal of a pedestrian, a decoder B for converting a BCD signal to a seven segment signal, and a seven segment pass number indicator for numerically displaying the output of the decoder B. Wherein the one-chip microprocessor B introduces a detection signal from the photosensor, counts the number of passers, outputs the counted result as a BCD signal, and transmits the result to the decoder B. 3. The display panel according to claim 2, wherein a display panel on which the alarm means, the bar graph indicator, and the seven-segment number passing number indicator is disposed is provided at a predetermined position on the rear side of the gate, and the sensitivity controller for sensitivity adjustment and the sensitivity signal are decoded. And a decoder A, a sensitivity indicator for displaying the decoded sensitivity signal, and a bar graph indicator for indicating the magnitude of the detected metal. 4. The method of any one of claims 1 to 3, wherein when the pulsed reception signal output from the comparator is read by a pulse reader and applied to the one chip microprocessor A, the one chip microprocessor A is applied to the data programmed in the internal program memory. The pulse read data is transmitted to the one chip microprocessor B, and the received pulse data input from the comparator is processed at a time difference so that two or more arch metal detectors can be connected to each arc metal detector even when operating in close proximity to each other. The gate-type metal detector which prevents malfunction by mutual interference.