CN111428833A - Bridge construction monitoring system based on block chain - Google Patents
Bridge construction monitoring system based on block chain Download PDFInfo
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- CN111428833A CN111428833A CN202010271881.6A CN202010271881A CN111428833A CN 111428833 A CN111428833 A CN 111428833A CN 202010271881 A CN202010271881 A CN 202010271881A CN 111428833 A CN111428833 A CN 111428833A
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- operational amplifier
- inverting input
- triode
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K2007/10495—Circuits for pulse forming, amplifying
Abstract
The invention discloses a bridge construction monitoring system based on a block chain, which comprises an RFID label, RFID read-write equipment and a computer monitoring terminal, wherein the RFID read-write equipment comprises an antenna, a signal processing unit, a microprocessor and a wireless module, the wireless module is used for forming remote communication between the RFID read-write equipment and the computer monitoring terminal, the signal processing unit comprises a received signal filtering circuit, a double-channel amplification regulating circuit, a fault protection circuit and a digital decoding circuit, the received signal filtering circuit automatically tunes an output signal of a coupling coil L1 to avoid central frequency deviation or frequency characteristic distortion of the received signal, the double-channel amplification regulating circuit reduces interference in post-stage circuit processing, and eliminates power supply noise by using a double-T filter, and can effectively eliminate external electromagnetic noise, and the fault protection circuit timely releases abnormal high voltage when continuous digital-analog surge voltage occurs to play a good protection role in protecting the RFID read-write equipment.
Description
Technical Field
The invention relates to the technical field of bridge construction monitoring, in particular to a bridge construction monitoring system based on a block chain.
Background
The control of the density of constructors and the dispatching of construction equipment are realized through positioning monitoring in a bridge construction site, and as block chains gradually go deep and are applied to bridge construction monitoring, a bridge construction monitoring system based on the block chains realizes distributed storage and point-to-point transmission of bridge construction site positioning data in different areas, so that the bridge construction monitoring is more convenient and has more complete functions. At present, the position monitoring of personnel and equipment is mainly realized through RFID equipment in bridge construction, and RFID equipment realizes the automatic identification of personnel and equipment under the mobile state through the information of the RFID electronic tags arranged on constructors and construction equipment in a remote and non-contact way, thereby realizing the automatic monitoring and management of targets. When reading tag information, the RFID device needs to sensitively detect a small input signal, and noise generated by an internal circuit of the RFID device may cause instability of the whole system, such as power supply noise, electromagnetic noise, and interference between digital and analog signals. External thunder and lightning or static electricity can also bring high-voltage peak noise volume to RFID equipment internal circuit and block the receipt of normal signal, can damage equipment even, influences whole bridge construction monitoring system and normally works.
Disclosure of Invention
In view of the above situation, in order to overcome the defects of the prior art, the present invention aims to provide a bridge construction monitoring system based on a block chain.
The bridge construction monitoring system comprises an RFID tag, RFID read-write equipment and a computer monitoring terminal, wherein the RFID read-write equipment comprises an antenna, a signal processing unit, a microprocessor and a wireless module, the wireless module is used for forming remote communication between the RFID read-write equipment and the computer monitoring terminal, the signal processing unit comprises a signal receiving filter circuit, a two-channel amplification regulating circuit, a fault protection circuit and a digital decoding circuit, the signal receiving filter circuit comprises a coupling coil 1, the coupling coil 1 couples signals received by the antenna, the signals are filtered and then are divided into two paths to be output to the two-channel amplification regulating circuit for processing after being amplified by a triode VT, the two-channel amplification regulating circuit comprises an operational amplifier U, the in-phase input end of the operational amplifier U is connected with a collector electrode of the triode VT through a resistor C, the anti-phase input end and the output end of the operational amplifier U are connected with a pin 1 of a resistor R and a pin 1 of an RP, the resistor R and a de-phase resistor R + emitter of the operational amplifier U, the operational amplifier U are connected with a collector electrode of a resistor C, the operational amplifier, the resistor C and a collector electrode of a resistor C, the operational amplifier U and a collector electrode of the decoder, the operational amplifier U are connected with a collector electrode of a collector of a resistor C, the amplifier U and a collector electrode of the amplifier, the amplifier U is connected with a collector electrode of the amplifier, the amplifier U is connected with a resistor C, the amplifier is connected with a resistor R and the amplifier, the amplifier is connected with the amplifier.
Preferably, the received signal filtering circuit includes diodes D1 and D2, an anode of the diode D1 is connected to one end of the coupling coil L, and is connected to one ends of the resistors R2, R4 and the capacitor C4 through the capacitors C1 and C2 connected in parallel, the other end of the resistor R2 is connected to one end of the resistor R3, one end of the capacitor C5 and the +5V power supply, the other end of the capacitor C5 is grounded, the other end of the resistor R3 is connected to an emitter of the transistor VT1 through the inductor L, the other end of the resistor R4 is connected to a base of the transistor VT1, the other end of the capacitor C4 is grounded, a cathode of the diode D1 is connected to an anode of the diode D2 and is connected to a collector of the transistor VT1 through the resistor R1 and the capacitor C1 in sequence, and a cathode of the diode D.
Preferably, the non-inverting input terminal of the operational amplifier U4 is connected to the output terminal of the operational amplifier U2A through a capacitor C10, the inverting input terminal of the operational amplifier U4 is connected to pin 3 of a varistor RP2, pin 1 of the varistor RP2 is connected to a +5V power supply through a resistor R19, and pin 2 of the varistor RP2 is grounded.
Through the technical scheme, the invention has the beneficial effects that:
1. the receiving signal filtering circuit automatically tunes the output signal of the coupling coil L1, simultaneously, the RC filtering is utilized to accurately restore the receiving signal, the triode VT1 amplifies the filtered signal, and capacitance positive feedback adjustment is added in the amplification process, the purpose of frequency selection amplification is achieved by tuning the resonance frequency of a loop and utilizing the filtering characteristic of the loop, and the central frequency deviation or the frequency characteristic distortion of the receiving signal is avoided;
2. the dual-channel amplification regulating circuit isolates and outputs an output signal of a collector electrode of the triode VT1 by using a voltage follower principle, reduces interference between digital and analog signals existing in the processing of a post-stage circuit, eliminates power supply noise by using a double-T filter, can effectively eliminate external electromagnetic noise, reduces the influence of spike pulse caused by thunder or static electricity, and ensures the normal receiving and processing of the signal;
3. the fault protection circuit is adopted to carry out sampling control on signals of the dual-channel amplification regulating circuit, and abnormal high voltage is timely released when continuous surge voltage occurs, so that the RFID read-write equipment is well protected.
Drawings
Fig. 1 is a schematic circuit diagram of a signal processing unit according to the present invention.
Fig. 2 is a control schematic block diagram of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A bridge construction monitoring system based on a block chain comprises an RFID tag, RFID read-write equipment and a computer monitoring terminal, wherein the RFID read-write equipment comprises an antenna, a signal processing unit, a microprocessor and a wireless module, and the wireless module is used for forming remote communication between the RFID read-write equipment and the computer monitoring terminal.
As shown in FIG. 1, the signal processing unit includes a received signal filtering circuit, a dual-channel amplification and adjustment circuit, a fault protection circuit and a digital decoding circuit, wherein the received signal filtering circuit includes a coupling coil L1, the coupling coil L couples signals received by the antenna and then sends the coupled signals to be filtered, the specific structure of the received signal filtering circuit includes diodes D1 and D2, the anode of the diode D1 is connected with one end of the coupling coil L1, and is connected with one end of resistors R2, R4 and one end of a capacitor C4 through capacitors C1 and C2 which are connected in parallel, the other end of the resistor R2 is connected with a resistor R3, one end of a capacitor C5 and a +5V power supply, the other end of the capacitor C5 is grounded, the other end of the resistor R3 is connected with the emitter of a transistor VT 3 through an inductor 3 2, the other end of the resistor R3 is connected with the base of the transistor VT 3, the other end of the capacitor C3 is grounded, the cathode of the diode D3 is connected with the anode of the transistor VT 3, and the collector of the diode VT 3 is connected with.
The diodes D1 and D2 in the received signal filter circuit are used for effectively and automatically tuning the output signal of the coupling coil L1 by using a semiconductor varactor and a reverse bias part which are manufactured by utilizing the principle that the capacitance between PN junctions is variable, meanwhile, capacitors C1, C2 and C4 and resistors R2 and R4 form an RC filter network to accurately select the frequency of the output signal of the coupling coil L1, so that the received signal is accurately restored, a triode VT1 amplifies the filtered signal, the capacitor C3 plays a role of positive feedback in the amplification process, the purpose of frequency-selective amplification is achieved by tuning the resonant frequency of a loop and utilizing the filter characteristic of the loop, and the central frequency shift or the frequency characteristic distortion of the received signal is avoided.
The power amplifier is amplified by a triode VT1 and then is output to a dual-channel amplification regulating circuit for processing in two ways, the dual-channel amplification regulating circuit comprises an operational amplifier U1, the non-inverting input end of the operational amplifier U1 is connected with the collector electrode of the triode VT1 through a capacitor C6, the inverting input end and the output end of the operational amplifier U1 are connected with one end of a resistor R6 and a pin 1 of a rheostat RP1, the other end of the resistor R6 is connected with one end of a resistor R7 and one end of a capacitor C9, a pin 2 of the rheostat RP1 is grounded, a pin 3 of the rheostat RP1 is connected with one end of a resistor R8 and a capacitor C8 through a capacitor, the other end of the capacitor C8 is connected with the non-inverting input end of the operational amplifier U2A, the inverting input end and the output end of the operational amplifier U2A are connected with the non-inverting input end of the operational amplifier U2B and one end of the resistor R10 through a resistor R9, the inverting input end and the output end of the operational amplifier U2A are connected with the other ends of the resistor R8 and the capacitor C9, and the other end of the resistor R10 is grounded. The operational amplifier U1 uses the voltage follower principle to isolate and output the output signal of the triode VT1 collector, so that the post circuit and the received signal filter circuit form electrical isolation, and the interference between digital and analog signals existing in the post circuit processing is reduced. Because the radio frequency circuit is quite sensitive to power supply noise, an output signal of the operational amplifier U1 is sent into a double T filter consisting of RC elements for regulation, and the operational amplifier U2A and the operational amplifier U2B are added to form an operational amplifier positive feedback filter network, so that the Q value of the double T filter is effectively improved, and the double T filter has a good inhibiting effect on spike voltage and other high-frequency harmonics caused by the power supply noise.
The dual-channel amplification and adjustment circuit further comprises a capacitor C11, one end of the capacitor C11 is connected with an emitter of a transistor VT 11, the other end of the capacitor C11 is connected with one end of a resistor R11 and one end of the capacitor C11, the other end of the resistor R11 is connected with the resistor R11, one end of the capacitor C11 and one end of a TVS tube D11 and the emitter of the transistor VT 11 through an inductor 11 3, the other end of the capacitor C11 is connected with the resistor R11, the other end of the TVS tube D11, one end of the capacitor C11 and a base of the transistor VT 11, the other ends of the capacitors C11 and C11 are grounded, a collector of the transistor VT 11 is connected with an output end of an operational amplifier U2 11 and one end of the capacitor C11 through the resistor R11, the other end of the capacitor C11 is grounded, the RFID read-write-read-write-device is greatly affected by external interference when receiving weak radio-frequency signals, so that the RFID-read-write-read-write-read-write-signal-read-write-read-.
Because the transient pulse that TVS pipe D4 can bear is nonrepeating, in order to avoid RFID read-write equipment circuit trouble that continuous surge voltage causes, adopt the fault protection circuit to carry out sampling control to the signal of two-channel amplification regulating circuit. The specific structure of the fault protection circuit comprises an operational amplifier U3, wherein the non-inverting input end of the operational amplifier U3 is connected with the cathode of a diode D3, the anode of the diode D3 is connected with one ends of resistors R14 and R15 through a capacitor C16, the other end of a resistor R14 is connected with the non-inverting input end of an operational amplifier U2B, the other end of a resistor R15 is grounded, the inverting input end of the operational amplifier U3 is connected with one ends of resistors R16 and R17, the other end of the resistor R16 is connected with a +5V power supply, the other end of the resistor R17 is grounded, the output end of the operational amplifier U3 is connected with one end of the capacitor C17 and the gate of a MOS transistor Q1 through a resistor R18, the other end of the capacitor C17 is grounded, the drain of the MOS transistor Q1 is connected with the collector of a. The resistor R14 and the resistor R15 sample the voltage of the non-inverting input terminal of the operational amplifier U2B by using a resistor voltage division principle, and then the sampled voltage is coupled by the capacitor C16 and is transmitted into the operational amplifier U3 after being unidirectionally conducted by the diode D3. The resistor R16 and the resistor R17 form threshold voltage at the inverting input end of the operational amplifier U3 by using a resistor voltage division principle, the operational amplifier U3 compares and outputs sampling voltage by using a comparator principle, when continuous surge voltage interference exists, continuous abnormal high-voltage signals exist in the dual-channel amplification regulating circuit, therefore, the sampling voltage value can also be increased to exceed the threshold voltage, the operational amplifier U3 overturns and outputs high-level signals, the high-level signals control the grid of the MOS tube to be electrically conducted, then the output abnormal high voltage of the triode VT1 is released to the ground, the surge voltage generated inside the circuit is electrically controlled in time, and the internal circuit of the equipment is effectively prevented from generating fault damage.
The digital decoding circuit comprises an operational amplifier U4 and a decoder, and the operational amplifier U4 carries out digital recovery on the analog signal output by the dual-channel amplification and adjustment circuit and then sends the analog signal to the decoder for identification. The non-inverting input end of the operational amplifier U4 is connected with the output end of the operational amplifier U2A through a capacitor C10, the inverting input end of the operational amplifier U4 is connected with a pin 3 of a rheostat RP2, a pin 1 of the rheostat RP2 is connected with a +5V power supply through a resistor R19, and a pin 2 of the rheostat RP2 is grounded.
When the system is used, constructors or construction equipment in one or more bridge construction sites are synchronously monitored, as shown in figure 2, RFID read-write equipment is arranged in each channel of the bridge construction sites, when the constructors or the construction equipment pass through the channel, the RFID read-write equipment can read corresponding RFID label information, the RFID label information is converted into an electric signal through a coupling coil L1, then the received signal is accurately restored through RC filtering, a triode VT1 amplifies the filtered signal, positive feedback of capacitance is added in the amplification process to realize frequency selection, central frequency deviation or frequency characteristic distortion of the received signal is avoided, a dual-channel amplification regulating circuit utilizes a voltage follower principle to isolate and output an output signal of a triode VT1 collector, interference between digital and analog modes existing in the processing of a later stage circuit is reduced, power source noise is eliminated by utilizing a dual-T filter, external electromagnetic noise can be effectively eliminated, spike pulse influence caused by reducing or static electricity is reduced, normal receiving and processing of the signal is ensured, a fault protection circuit is utilized to carry out sampling control on the signal of the amplification regulating circuit, high-voltage continuous processing, lightning is transmitted to a microprocessor, and is used for realizing remote control of a wireless reading, and reading and writing data processing, and transmitting of a microprocessor, and a microprocessor which is connected to realize remote control.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (3)
1. A bridge construction monitoring system based on a block chain comprises an RFID tag, RFID read-write equipment and a computer monitoring terminal, wherein the RFID read-write equipment comprises an antenna, a signal processing unit, a microprocessor and a wireless module, the wireless module is used for forming remote communication between the RFID read-write equipment and the computer monitoring terminal, and the bridge construction monitoring system is characterized in that the signal processing unit comprises a received signal filtering circuit, a double-channel amplification regulating circuit, a fault protection circuit and a digital decoding circuit, the received signal filtering circuit comprises a coupling coil L1, the coupling coil L1 couples signals received by the antenna, then the signals are transmitted to the filtering circuit after being coupled, and then the signals are amplified by a triode VT1 and then are output to the double-channel amplification regulating circuit in two paths for processing;
the dual-channel amplification regulating circuit comprises an operational amplifier U1, wherein the non-inverting input end of the operational amplifier U1 is connected with the collector of a triode VT1 through a capacitor C6, the inverting input end and the output end of the operational amplifier U1 are connected with one end of a resistor R6 and a pin 1 of a rheostat RP1, the other end of a resistor R6 is connected with one end of a resistor R7 and one end of a capacitor C9, a pin 2 of a rheostat RP1 is grounded, a pin 3 of the rheostat RP1 is connected with one end of a resistor R8 and one end of a capacitor C8 through a capacitor C7, the other ends of a resistor R7 and a capacitor C8 are connected with the non-inverting input end of the operational amplifier U2A, the inverting input end and the output end of the operational amplifier U2A are connected with the non-inverting input end of the operational amplifier U2B and one end of a resistor R10 through a resistor R9, the inverting input end of;
the high-voltage power supply further comprises a capacitor C11, one end of the capacitor C11 is connected with an emitter of a triode VT1, the other end of the capacitor C11 is connected with one ends of a resistor R11 and a capacitor C12, the other end of the resistor R11 is connected with one ends of a resistor R12, a capacitor C13 and a TVS tube D4 and an emitter of a triode VT2 through an inductor L3, the other end of the capacitor C12 is connected with the other ends of a resistor R12 and a TVS tube D4, one end of a capacitor C14 and a base of a triode VT2, the other ends of the capacitors C13 and C14 are grounded, a collector of the triode VT2 is connected with an output end of an operational amplifier U2A and one end of a capacitor C15 through a resistor R13;
the fault protection circuit comprises an operational amplifier U3, wherein the non-inverting input end of the operational amplifier U3 is connected with the cathode of a diode D3, the anode of the diode D3 is connected with one ends of resistors R14 and R15 through a capacitor C16, the other end of the resistor R14 is connected with the non-inverting input end of an operational amplifier U2B, the other end of the resistor R15 is grounded, the inverting input end of the operational amplifier U3 is connected with one ends of resistors R16 and R17, the other end of the resistor R16 is connected with a +5V power supply, the other end of the resistor R17 is grounded, the output end of the operational amplifier U3 is connected with one end of a capacitor C17 and the gate of a MOS transistor Q1 through a resistor R18, the other end of the capacitor C17 is grounded, the drain of the MOS transistor Q1 is connected with the collector of a triode VT;
the digital decoding circuit comprises an operational amplifier U4 and a decoder, and the operational amplifier U4 carries out digital recovery on the output signal of the dual-channel amplification regulating circuit and then sends the output signal to the decoder for identification.
2. The bridge construction monitoring system based on the block chain as claimed in claim 1, wherein the received signal filtering circuit comprises diodes D1 and D2, the anode of the diode D1 is connected with one end of a coupling coil L, and is connected with one ends of resistors R2, R4 and C4 through capacitors C1 and C2 which are connected in parallel, the other end of the resistor R2 is connected with a resistor R3, one end of the capacitor C5 and a +5V power supply, the other end of the capacitor C5 is grounded, the other end of the resistor R3 is connected with the emitter of a triode VT1 through an inductor L, the other end of the resistor R4 is connected with the base of a triode VT1, the other end of the capacitor C4 is grounded, the cathode of the diode D1 is connected with the anode of D2 and is connected with the collector of the triode VT1 through the resistor R1 and the capacitor C1 in sequence, and the cathode of the diode D1 is grounded with the other end of the.
3. The block chain-based bridge construction monitoring system of claim 1, wherein: the non-inverting input end of the operational amplifier U4 is connected with the output end of the operational amplifier U2A through a capacitor C10, the inverting input end of the operational amplifier U4 is connected with a pin 3 of a rheostat RP2, a pin 1 of the rheostat RP2 is connected with a +5V power supply through a resistor R19, and a pin 2 of the rheostat RP2 is grounded.
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| CN202010271881.6A CN111428833B (en) | 2020-04-09 | 2020-04-09 | Bridge construction monitoring system based on block chain |
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| CN202010271881.6A CN111428833B (en) | 2020-04-09 | 2020-04-09 | Bridge construction monitoring system based on block chain |
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| CN113517898A (en) * | 2021-04-27 | 2021-10-19 | 河南城建学院 | Bridge construction signal processing apparatus |
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| CN111428833B (en) | 2021-09-17 |
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