CN111398357A - Vehicle door security inspection instrument system and detection method - Google Patents
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Abstract
The invention discloses a vehicle door security check instrument system and a detection method, comprising an airflow acquisition unit, a detection sensor, a controllable oscillation circuit, a signal conditioning unit, a signal processor unit, a sample library, a display alarm unit and a network communication unit; the air flow collecting unit is used for adsorbing air flow to the interior of the security check instrument, the air flow flows through the detection sensor, the detection sensor is a molecule branded explosive detection sensor, and the detection sensor converts content information of inflammable and explosive substances into crystal oscillation frequency and inputs the crystal oscillation frequency into the rear-stage signal conversion circuit. The invention combines the mass-electricity sensitive conversion characteristic of the piezoelectric crystal detection sensor to realize sensitive detection of explosives carried by passengers, converts the content information of inflammable and explosive substances detected by the detection sensor into crystal oscillator frequency information through non-contact measurement, finally obtains the processing of the type and concentration information of detected articles through the processing of the signal processor unit, and can automatically alarm when the display frequency and the concentration value are too large.
Description
Technical Field
The invention belongs to the field of public safety, relates to a vehicle door security inspection technology, and particularly relates to a vehicle door security inspection instrument system and a vehicle door security inspection method.
Background
In recent years, terrorist explosion cases occur in public places, public transport vehicles and other dense people areas, and the safety of lives and properties of people is seriously threatened. Explosives have heretofore been the most common form of terrorist criminal activity due to their ease of formulation and production, and the potential for several deaths and significant property damage.
Therefore, the method is very necessary for monitoring inflammable and explosive substances in advance, finding out the inflammable and explosive substances early and taking treatment measures in time, and particularly can prevent and control the inflammable and explosive substances in time during large-scale gatherings and important activities to form intangible deterrent force, so that the method becomes a necessary means for maintaining the safety of citizens and preventing accidents. Public transport vehicles are the first choice for urban people to go out, people in the vehicles are dense, the occurrence of casualty events causes great social influence, and the public transport vehicles often become targets for terrorist activities made by lawbreakers.
Therefore, the special security check instrument for the vehicle is developed, and has important significance for improving the security level of China and ensuring the life safety of people.
Disclosure of Invention
The invention aims to provide a vehicle door security inspection instrument system and a detection method, which take a biological detection technology as a means, detect a molecular polymer with specific identification capability through Molecular Imprinting Technology (MIT), detect molecular particles adsorbed on passengers or carried articles at the entrance of a vehicle door through a non-contact measurement and a detection sensor, display corresponding components and content of the detected articles, and display and alarm when the content exceeds a set value.
The purpose of the invention can be realized by the following technical scheme:
a car door security check instrument system comprises an airflow acquisition unit, a plurality of detection sensors, a controllable oscillation circuit, a signal conditioning unit, a signal processor unit, a sample library, a display alarm unit and a network communication unit; the airflow acquisition unit is connected with the signal processor unit; the detection sensors are interactively connected with the signal conditioning unit; the controllable oscillation circuit is interactively connected with the signal conditioning unit and the signal processor unit respectively; the signal conditioning unit is interactively connected with the signal processor unit, and the signal processor unit is interactively connected with the sample library, the display alarm unit and the network communication unit; the signal processor unit is used for acquiring a vehicle door control signal, and transmitting a control signal to the airflow acquisition unit when the vehicle door is detected to be opened; the air flow collecting unit is a negative pressure generating device and is used for generating a negative pressure area on the side, opposite to the car door air flow generating side, of the security check instrument, and is used for adsorbing air flow to the interior of the security check instrument and enabling the air flow to flow through the plurality of detection sensors through the pipeline; the detection sensors are molecular branded explosive detection sensors, and convert the detected content information of the flammable and explosive substances into crystal oscillation frequency and input the crystal oscillation frequency into a post-stage signal conversion circuit.
Furthermore, the airflow acquisition unit receives the vehicle door control signal acquired by the signal processor unit, when the vehicle door is detected to be opened, the signal processor unit outputs a control signal, the airflow acquisition unit controls airflow to flow and collect flowing airflow, and the airflow flows through the plurality of detection sensors through the pipeline.
Furthermore, the controllable oscillation circuit is a sine wave oscillation circuit with variable numerical control frequency, and the signal processor unit conversion circuit generates two variable control signals to automatically control the sine wave oscillator to generate oscillation signals with adjustable frequency and invariable amplitude and perform multi-path output.
Furthermore, the signal conditioning unit is respectively connected with the plurality of detection sensors and the controllable oscillation circuit, and respectively mixes the input signals of each sensor and the controllable oscillation circuit, the detection signals generated by the detection sensors and the sine wave signals generated by the controllable oscillation circuit are respectively sent to the corresponding analog multiplier mixing circuits to generate difference frequency output, and the difference frequency signals are taken out by the L C resonant filter and converted into square wave signals to be input to the signal processor unit.
Furthermore, the signal processor unit is connected with a plurality of detection sensors and receives signals transmitted by the detection sensors, the signal processor unit compares the received information with information in the sample library, the signal processor unit obtains the type of the explosive through the analysis of the input signals, and displays the corresponding components and the content of the detected articles on the display alarm unit;
when the content exceeds the set value, the system displays and gives an alarm, and transmits the current alarm information to the whole vehicle communication network through the network terminal communication unit.
Further, the sample library is interactively connected with the signal processor unit, and data of different types of sensitive objects are stored in the sample library.
A detection method of a vehicle door security inspection instrument system comprises the following steps:
the method comprises the following steps: when the vehicle door is opened, the signal processor unit detects a vehicle door control signal, outputs a control signal and controls airflow to flow, and the airflow collecting unit sucks the flowing airflow into the security check instrument and flows through the plurality of detection sensors through the pipeline; when the airflow flows through the surface of the detection sensor, particulate matters in the airflow are adsorbed on the surface of the sensor, and the output frequency of the detection sensor is changed and is input into a post-stage signal conversion circuit;
the signal conditioning unit is respectively connected with a plurality of detection sensors and a controllable oscillation circuit, respectively mixes the frequency of each detection sensor with the input signal of the controllable oscillator, takes out the difference frequency signal of the detection sensor through an L C resonant filter, converts the signal into a square wave signal, and inputs the square wave signal to the signal processor unit;
step three: the signal processor unit receives the difference frequency signal transmitted by the signal conditioning unit and detects each path of square wave signal;
and after detecting the current difference frequency, the signal processor unit compares the current difference frequency with the sample information in the sample library to obtain the current detected explosive type, displays and alarms on the display alarm unit, and transmits current alarm information to the whole vehicle communication network through the network terminal communication unit.
The invention has the beneficial effects that:
1. due to the superior specificity and good adaptability of the molecular imprinting technology, the invention combines the mass-electricity sensitive conversion characteristic of the piezoelectric crystal detection sensor to realize sensitive detection of explosives carried by passengers, converts the content information of inflammable and explosive substances detected by the detection sensor into crystal oscillation frequency information through non-contact measurement, finally obtains the processing of the type and concentration information of detected articles through the processing of the signal processor unit, and can automatically alarm when the display frequency and concentration value are too large.
2. Through technical improvement, the invention can be designed into small and portable handheld equipment, is convenient for safety inspection of large public places such as railway stations, airports, docks and the like, and can finally accurately detect the content of flammable and combustible substances such as alcohol, gasoline, TNT, octogen, hexogen and the like, thereby realizing the functions of quick detection and alarm.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a vehicle door security inspection instrument system according to the present invention.
Detailed Description
As shown in fig. 1, a car door security inspection instrument system comprises an airflow acquisition unit, a plurality of detection sensors, a controllable oscillation circuit, a signal conditioning unit, a signal processor unit, a sample library, a display alarm unit and a network communication unit; wherein, the airflow acquisition unit is connected with the signal processor unit; the detection sensors are interactively connected with the signal conditioning unit; the controllable oscillating circuit is interactively connected with the signal conditioning unit and the signal processor unit respectively; the signal conditioning unit is interactively connected with the signal processor unit, and the signal processor unit is interactively connected with the sample library, the display alarm unit and the network communication unit; the signal processor unit is used for acquiring a vehicle door control signal, and when the vehicle door is detected to be opened, the signal processor unit transmits a control signal to the airflow acquisition unit.
Preferably, the detection sensors are molecular branded explosive detection sensors, specifically piezoelectric crystal detection sensors are adopted, and the preparation principle is that a molecular polymer with specific recognition capability on template molecules is prepared and detected based on the principle that an antigen is used for preparing an antibody; the piezoelectric crystal is combined with a conversion circuit, when the surface of the crystal has small mass change, the change of the resonance frequency of the crystal can be caused, and the change of the output frequency of the crystal is caused.
Preferably, the airflow acquisition unit receives a vehicle door control signal acquired by the signal processor unit, when the vehicle door is detected to be opened, the signal processor unit outputs a control signal, the airflow acquisition unit controls airflow to flow and collect flowing airflow, and the airflow flows through the plurality of detection sensors through the pipeline. The air flow collecting unit is a negative pressure generating device and is used for generating a negative pressure area on the side, opposite to the vehicle door air flow, of the security check instrument and absorbing air flow to the interior of the security check instrument and enabling the air flow to flow through the plurality of detection sensors through the pipeline. At this time, if a passenger contacts the explosive before or the portable object contains the explosive, molecules of the explosive inevitably adsorb on the surface, and when the passenger enters through the vehicle door, the explosive molecules adsorbed on the passenger or the portable object diffuse into the surrounding air and are sucked into the security check instrument due to the impact of the airflow.
Preferably, the controllable oscillating circuit is a sine wave oscillating circuit with variable numerical control frequency, and the signal processor unit conversion circuit generates two variable control signals to automatically control the sine wave oscillator to generate oscillation signals with adjustable frequency and invariable amplitude and perform multi-path output.
Preferably, the signal conditioning unit is respectively connected with the plurality of detection sensors and the controllable oscillation circuit, and respectively mixes the input signals of each sensor and the controllable oscillation circuit, the detection signals generated by the detection sensors and the sine wave signals generated by the controllable oscillation circuit are respectively sent to the corresponding analog multiplier mixing circuits, and the multiplier is utilized to enable the circuits to easily generate difference frequency output.
Preferably, the signal processor unit is connected with a plurality of detection sensors and receives signals transmitted by the detection sensors, under normal conditions, because the surfaces of the detection sensors are not provided with explosive molecules, the signals output by the detection sensors and the signals input by the controllable sine wave oscillator are mixed, the frequency of the difference frequency signals is lower, the system works normally, otherwise, if a passenger contacts the explosive before or contains the explosive in the carry-on object, the molecules are inevitably adsorbed on the surfaces, when the passenger enters through a vehicle door, the explosive molecules adsorbed on the passenger or the carry-on object are diffused into the surrounding air due to the impact of the air flow and are sucked into the interior of the security inspection instrument to flow through the surfaces of the detection sensors, the frequency change of the detection sensors generates larger frequency deviation, and the frequency signals and the signals input by the controllable sine wave oscillator, after frequency mixing, the frequency change of the difference frequency signal is large and is detected by the signal processor unit, the signal processor unit compares the received information with the information in the sample library, and because the sample library stores the related data of different types of sensitive objects, the signal processor unit can quickly analyze the type of the current detected explosive by analyzing the input signal, and display the corresponding detected object components and the content (detection value) thereof on the display alarm unit;
when the content (detection value) exceeds a set value, the system displays and gives an alarm, and transmits current alarm information to the whole vehicle communication network through the network terminal communication unit.
Preferably, the sample library is interactively connected with the signal processor unit, and related data of different types of sensitive objects are stored in the sample library; the signal processor unit receives the difference frequency signal transmitted by the signal conditioning unit and detects each path of square wave signal, when explosive molecules are not attached to the surface of the detection sensor, the frequency of the mixed difference frequency signal is lower, otherwise, the frequency of the square wave signal input to the signal processor unit is increased, and after the signal processor detects the current difference frequency, the signal processor compares the current difference frequency with sample information in a sample library to obtain the current detected type of the explosive.
A detection method of a vehicle door security inspection instrument system comprises the following steps:
the method comprises the following steps: when the vehicle door is opened, the signal processor unit detects a vehicle door control signal, outputs a control signal and controls airflow to flow, and the airflow collecting unit sucks the flowing airflow into the security check instrument and flows through the plurality of detection sensors through the pipeline; the detection sensors are distributed in the air chamber of the airflow pipeline, when airflow flows across the surfaces of the detection sensors, particles in the airflow are adsorbed on the surfaces of the sensors, and when the surface of the crystal has small mass change, the resonance frequency of the crystal is changed, so that the output frequency of the crystal is changed and is input into the post-stage signal conversion circuit;
the signal conditioning unit is respectively connected with a plurality of detection sensors and the controllable oscillating circuit, respectively mixes the frequency of each detection sensor with the input signal of the controllable oscillator, takes out the difference frequency signal of the detection sensor through an L C resonant filter, converts the signal into a square wave signal and inputs the square wave signal to the signal processor unit;
step three: the signal processor unit receives the difference frequency signal transmitted by the signal conditioning unit and detects each path of square wave signal;
when explosive molecules are not attached to the surface of the detection sensor, the frequency of the mixed difference frequency signal is low, otherwise, the frequency of the square wave signal input to the signal processor unit is increased, the signal processor unit detects the current difference frequency and compares the current difference frequency with sample information in a sample library to obtain the type of the detected explosive, the type of the detected explosive is displayed and alarmed on the display alarm unit, and the current alarm information is transmitted to the whole vehicle communication network through the network terminal communication unit.
The present invention relates to the prior art, and more particularly, to "analytical chemistry (FENXI HUAXUE) review and development" stage 10, volume thirtieth, 10 months in 2002, application and recent development of molecular imprinting technology "published by liu chong, liu ying, wang de, shang zheng hua (trade and lively)," computer and digital engineering "stage 1 in 2017," inflammable and explosive detection system design "published by seikuan, han peng, zhao si yao, li nan and so on," design of nano molecular imprinting biochemical sensor for explosive detection "published by Ni yuan, huli zhao, morning and so on.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (7)
1. A car door security check instrument system is characterized by comprising an airflow acquisition unit, a plurality of detection sensors, a controllable oscillation circuit, a signal conditioning unit, a signal processor unit, a sample library, a display alarm unit and a network communication unit;
the airflow acquisition unit is connected with the signal processor unit; the detection sensors are interactively connected with the signal conditioning unit; the controllable oscillation circuit is interactively connected with the signal conditioning unit and the signal processor unit respectively; the signal conditioning unit is interactively connected with the signal processor unit, and the signal processor unit is interactively connected with the sample library, the display alarm unit and the network communication unit;
the signal processor unit is used for acquiring a vehicle door control signal, and transmitting a control signal to the airflow acquisition unit when the vehicle door is detected to be opened;
the air flow collecting unit is a negative pressure generating device and is used for generating a negative pressure area on the side, opposite to the car door air flow generating side, of the security check instrument, and is used for adsorbing air flow to the interior of the security check instrument and enabling the air flow to flow through the plurality of detection sensors through the pipeline;
the detection sensors are molecular branded explosive detection sensors, and convert the detected content information of the flammable and explosive substances into crystal oscillation frequency and input the crystal oscillation frequency into a post-stage signal conversion circuit.
2. The vehicle door security inspection instrument system according to claim 1, wherein the airflow collection unit receives the vehicle door control signal collected by the signal processor unit, when the vehicle door is detected to be opened, the signal processor unit outputs a control signal, the airflow collection unit controls airflow to flow and collect the flowing airflow, and the airflow flows through the plurality of detection sensors through the pipeline.
3. The car door security inspection instrument system according to claim 1, wherein the controllable oscillating circuit is a sine wave oscillating circuit with variable numerical control frequency, and the signal processor unit conversion circuit generates two variable control signals to automatically control the sine wave oscillator to generate the oscillating signal with adjustable frequency and constant amplitude for multi-output.
4. The car door security inspection instrument system according to claim 1, wherein the signal conditioning unit is connected to a plurality of detecting sensors and a controllable oscillating circuit respectively, the signals input to the detecting sensors and the controllable oscillating circuit are mixed, the detecting signals generated by the detecting sensors and the sine wave signals generated by the controllable oscillating circuit are respectively sent to the corresponding analog multiplier mixer circuits to generate difference frequency output, and the difference frequency signals are extracted by an L C resonant filter and converted into square wave signals to be input to the signal processor unit.
5. A vehicle door security check instrument system as claimed in claim 1, wherein:
the signal processor unit is connected with the detection sensors and receives signals transmitted by the detection sensors, the signal processor unit compares the received information with information in the sample library, the signal processor unit obtains the type of the explosive through analysis of the input signals, and the corresponding detected article components and the content of the explosive are displayed on the display alarm unit;
when the content exceeds the set value, the system displays and gives an alarm, and transmits the current alarm information to the whole vehicle communication network through the network terminal communication unit.
6. A vehicle door security inspection system as claimed in claim 1, wherein the sample library is interactively connected to the signal processor unit, and data of different types of sensitive objects are stored in the sample library.
7. The detecting method of a door security check instrument system as recited in any one of claims 1 to 6, comprising the steps of:
the method comprises the following steps: when the vehicle door is opened, the signal processor unit detects a vehicle door control signal, outputs a control signal and controls airflow to flow, and the airflow collecting unit sucks the flowing airflow into the security check instrument and flows through the plurality of detection sensors through the pipeline; when the airflow flows through the surface of the detection sensor, particulate matters in the airflow are adsorbed on the surface of the sensor, and the output frequency of the detection sensor is changed and is input into a post-stage signal conversion circuit;
the signal conditioning unit is respectively connected with a plurality of detection sensors and a controllable oscillation circuit, respectively mixes the frequency of each detection sensor with the input signal of the controllable oscillator, takes out the difference frequency signal of the detection sensor through an L C resonant filter, converts the signal into a square wave signal, and inputs the square wave signal to the signal processor unit;
step three: the signal processor unit receives the difference frequency signal transmitted by the signal conditioning unit and detects each path of square wave signal;
and after detecting the current difference frequency, the signal processor unit compares the current difference frequency with the sample information in the sample library to obtain the current detected explosive type, displays and alarms on the display alarm unit, and transmits current alarm information to the whole vehicle communication network through the network terminal communication unit.
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Cited By (1)
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| CN112505244A (en) * | 2020-11-05 | 2021-03-16 | 福建美营自动化科技有限公司 | Circuit and method for quickly distinguishing low-concentration gasoline and alcohol in air |
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