CN203705400U - Grounding grid corrosion detection system - Google Patents
Grounding grid corrosion detection system Download PDFInfo
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- CN203705400U CN203705400U CN201420059625.0U CN201420059625U CN203705400U CN 203705400 U CN203705400 U CN 203705400U CN 201420059625 U CN201420059625 U CN 201420059625U CN 203705400 U CN203705400 U CN 203705400U
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Abstract
The utility model discloses a grounding grid corrosion detection system, which comprises a main control circuit, an energizing circuit, an electromagnetic ultrasonic sensor placed above a grounding grid, a receiving circuit and an alarm circuit, wherein the main control circuit is used for sending control signals; the energizing circuit is used for generating pulses to the electromagnetic ultrasonic sensor according to the control signals; the electromagnetic ultrasonic sensor is used for generating ultrasonic waves transmitting along the surface of the grounding grid according to the pulses, receiving reflected waves reflected from the surface of the grounding grid and sending voltage detecting signals; the receiving circuit is used for amplifying and filtering the voltage detecting signals and then sending the voltage detecting signals to the main control circuit; the main control circuit is also used for sending alarm signals to the alarm circuit according to the voltage detecting signals when the grounding grid is corroded; the alarm circuit is used for receiving the alarm signals and giving an alarm. According to the grounding grid corrosion detection system, the corrosion detection is realized by using the electromagnetic ultrasonic sensor which is in non-contact with the grounding grid, an acoustic couplant is not required to be added, the repeatability is good, the detection speed is high, and when corrosion is detected, workers can know through the alarm circuit.
Description
Technical field
The utility model relates to electric system detection field, more particularly, relates to a kind of ground net corrosion detection system.
Background technology
China's grounded screen adopts the steel material such as band steel, round steel mostly, because grounded screen conductor is embedded in underground, normal along with the increase of tenure of use and the impact of underground severe running environment, chemistry and the galvanic corrosion of soil are inevitable, also will bear the corrosion of earth mat diffusing territory stray current simultaneously.Ground net corrosion presents local corrosion form conventionally, the rear grounded screen carbon steel Steel material of generation corrosion becomes fragile, aliquation, loose, grounding body cross section reduces even to rupture, cause ground connection performance bad, can not meet the requirement of thermal stability, thereby circuital current will burn out grounded screen, earth potential rises suddenly, and high pressure is altered and caused transmitting and transforming equipment to burn in a large number to secondary circuit even jeopardizing personal safety.
For a long time, only pay attention to the measurement of stake resistance, ignore corrosion condition inspection and assessment to equipment ground lead-in wire and grounded screen.The requirement of earthing device, only take the size of its overall stake resistance as standard, is thought to the qualified earthing device of stake resistance is just qualified.And in fact grounding body cross section diminishes, stake resistance still can be qualified, it is very thin to be that grounding body corrosion obtains, stake resistance also may meet the demands, if find, grounded screen electric resistance is defective or occur after ground fault, then grounded screen is carried out to dig on a wide area and search grounded screen breakpoint and corrosion section, workload is very big, and have blindness, expense is also huge, and affect the normal operation of electric system.The method adopting is at present that excavation inspection was undertaken by the time cycle, and almost it doesn't matter with the health status of grounded screen, also far apart with the repair based on condition of component of vigorously advocating at present.
Utility model content
The technical problems to be solved in the utility model is, for the low and numerous and diverse defect of the above-mentioned detection efficiency of prior art, provides a kind of ground net corrosion detection system.
The utility model solves the technical scheme that its technical matters adopts: construct a kind of ground net corrosion detection system, comprise governor circuit, energizing circuit, be placed in electromagnetic ultrasonic transducer, receiving circuit and the warning circuit of grounded screen top;
Described energizing circuit, receiving circuit and warning circuit are connected to respectively described governor circuit, and described energizing circuit and receiving circuit are also connected to respectively described electromagnetic ultrasonic transducer;
Described governor circuit is used for sending a control signal to energizing circuit, described energizing circuit is used for according to described control signal production burst to described electromagnetic ultrasonic transducer, described electromagnetic ultrasonic transducer is for producing the ultrasound wave transmitting along described grounded screen surface and the concurrent detectable voltage signals of sending of reflection wave that receives described grounded screen surface reflection to receiving circuit according to pulse, described receiving circuit is for carrying out described detectable voltage signals to be sent to described governor circuit after amplification filtering processing, described governor circuit is also for sending alerting signal to warning circuit according to described detectable voltage signals when the ground net corrosion, described warning circuit is used for receiving alerting signal and reports to the police.
Ground net corrosion detection system described in the utility model, wherein, described energizing circuit comprise the driving circuit that amplifies for generation of the signal generating circuit of pulse, by the voltage magnitude of pulse, by pulse power amplify to increase ultrasonic intensity power amplification circuit, increase the impedance matching circuit of electro-acoustic conversion efficiency;
Described signal generating circuit, driving circuit, power amplification circuit, impedance matching circuit are connected successively, and described signal generating circuit is also connected to described governor circuit, and described impedance matching circuit is also connected to described electromagnetic ultrasonic transducer.
Ground net corrosion detection system described in the utility model, wherein, described governor circuit comprises that model is the single-chip microcomputer of AT89S52;
Described signal generating circuit comprises DDS chip for setting pulsed frequency, low-pass filter circuit and for setting the analog switch of impulse phase and number, the model of described DDS chip is AD9851;
P1.0 to the P1.7 pin of described single-chip microcomputer connects one to one respectively to D0 to the D7 pin of DDS chip, the P3.0 pin of described single-chip microcomputer is connected to the W_CLK pin of DDS chip, the P3.1 pin of single-chip microcomputer is connected to the FQ_UD pin of DDS chip, single-chip microcomputer is also connected to the control end of analog switch, the IOUT pin of described DDS chip is connected to the input end of low-pass filter circuit, the output terminal of described low-pass filter circuit is connected to analog switch input end, and two output terminals of described analog switch are connected to driving circuit.
Ground net corrosion detection system described in the utility model, wherein, described driving circuit comprises two identical secondary drive circuit, and each secondary drive circuit comprises the first triode, the second triode, the 3rd triode, the first electric capacity, the second electric capacity, the first resistance and the second resistance;
The base stage of described the first triode is connected to an output terminal of analog switch by the first resistance, the grounded emitter of the first triode, the collector of the first triode is connected to respectively the base stage of the second triode, one end of the base stage of the 3rd triode and the second resistance, the other end of the second resistance is connected to positive source, the emitter of the second triode is connected to the emitter of the 3rd triode, the collector of the second triode is connected to positive source, the collector of the 3rd triode is connected to power cathode, power cathode ground connection, the base stage of the second triode is also connected to power amplification circuit by the parallel branch of the first electric capacity and the second electric capacity.
Ground net corrosion detection system described in the utility model, wherein, described power amplification circuit comprises the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the first bridge balance resistance, the second bridge balance resistance, the first brachium pontis electric capacity, the second brachium pontis electric capacity, the first diode, the second diode; Described impedance matching circuit comprises transformer and the 3rd electric capacity;
The base stage of the base stage of described the first metal-oxide-semiconductor and the second metal-oxide-semiconductor is connected to respectively corresponding secondary drive circuit, the source electrode of the first metal-oxide-semiconductor is connected to the drain electrode of the second metal-oxide-semiconductor, the drain electrode of the first metal-oxide-semiconductor is connected to positive source, the source electrode of the second metal-oxide-semiconductor is connected to power cathode, the negative pole of the first diode is connected to the source electrode of the first metal-oxide-semiconductor, the positive pole of the first diode is connected to the drain electrode of the first metal-oxide-semiconductor by the parallel branch of an electric capacity and resistance, the positive pole of the second diode is connected to the drain electrode of the second metal-oxide-semiconductor, the negative pole of the second diode is connected to the source electrode of the second metal-oxide-semiconductor by the parallel branch of an electric capacity and resistance, one end of the primary coil of described transformer is connected with the source electrode of the first metal-oxide-semiconductor, the other end of primary coil is connected to positive source and is connected to power cathode by the second bridge balance resistance by the first bridge balance resistance respectively, the first brachium pontis electric capacity is in parallel with the first bridge balance resistance, the second brachium pontis electric capacity is in parallel with the second bridge balance resistance, after the secondary coil of described transformer and the 3rd capacitances in series, be connected to electromagnetic ultrasonic transducer.
Ground net corrosion detection system described in the utility model, wherein, described warning circuit comprises the 4th triode, hummer and light emitting diode;
The base stage of described the 4th triode is connected to single-chip microcomputer, the grounded emitter of described the 4th triode, the collector of described the 4th triode is connected to the negative pole of light emitting diode, and the positive pole of light emitting diode is connected to the negative pole of hummer, and the positive pole of hummer is connected to positive source.
Ground net corrosion detection system described in the utility model, wherein, described receiving circuit comprises filtering and amplifying circuit and the A/D Acquisition Circuit of detectable voltage signals being carried out to amplification filtering processing;
Described filtering and amplifying circuit is connected to respectively described electromagnetic ultrasonic transducer and A/D Acquisition Circuit, and described A/D Acquisition Circuit is also connected to governor circuit.
Implement ground net corrosion detection system of the present utility model, there is following beneficial effect: in the utility model, utilize electromagnetic ultrasonic transducer to realize with the non-contacting corrosion in grounded screen surface and detect, without adding, entering tone brings disaster upon mixture, reproducible, detection speed is high, and in the time corrosion being detected, remind staff by warning circuit.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Figure 1A is the structured flowchart of the utility model ground net corrosion detection system;
The layout schematic diagram of electromagnetic ultrasonic transducer when Figure 1B is the utility model ground net corrosion detection system detection ground net corrosion;
Fig. 2 is governor circuit in the preferred embodiment of the utility model ground net corrosion detection system and the circuit diagram of signal generating circuit;
Fig. 3 is the circuit diagram of driving circuit, power amplification circuit and impedance matching circuit in the preferred embodiment of the utility model ground net corrosion detection system;
Fig. 4 is the circuit diagram of the filtering and amplifying circuit in the preferred embodiment of the utility model ground net corrosion detection system;
Fig. 5 is the circuit diagram of the warning circuit in the preferred embodiment of the utility model ground net corrosion detection system.
Embodiment
In order to solve the low and numerous and diverse defect of corrosivity monitor efficiency of grounded screen in prior art, the utility model provides a kind of ground net corrosion detection system.In the utility model, utilize electromagnetic ultrasonic transducer to realize with the non-contacting corrosion in grounded screen surface and detect, without adding, entering tone brings disaster upon mixture, reproducible, detection speed is high, and in the time corrosion being detected, reminds staff by warning circuit.
Understand for technical characterictic of the present utility model, object and effect being had more clearly, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
It is the structured flowchart of the utility model ground net corrosion detection system with reference to Figure 1A;
Ground net corrosion detection system of the present utility model, comprises governor circuit 1, energizing circuit 20, is placed in electromagnetic ultrasonic transducer 2, receiving circuit 30 and the warning circuit 3 of grounded screen 10 tops;
Described energizing circuit 20, receiving circuit 30 and warning circuit 3 are connected to respectively described governor circuit 1, and described energizing circuit 20 and receiving circuit 30 are also connected to respectively described electromagnetic ultrasonic transducer 2;
Described governor circuit 1 is for sending a control signal to energizing circuit 20, described energizing circuit 20 for according to described control signal production burst to described electromagnetic ultrasonic transducer 2, described electromagnetic ultrasonic transducer 2 is for producing the ultrasound wave transmitting along described grounded screen 10 surfaces and the concurrent detectable voltage signals of sending of reflection wave that receives described grounded screen 10 surface reflections to receiving circuit 30 according to pulse, described receiving circuit 30 is sent to described governor circuit 1 for described detectable voltage signals is carried out after amplification filtering processing, described governor circuit 1 also for sending alerting signal to warning circuit 3 according to described detectable voltage signals in the time that grounded screen 10 is corroded, described warning circuit 3 is for receiving alerting signal and reporting to the police.
Wherein, described energizing circuit 20 comprises for generation of the signal generating circuit 21 of pulse, the driving circuit 22 that the voltage magnitude of pulse is amplified, pulse power is amplified to increase the power amplification circuit 23 of ultrasonic intensity, the impedance matching circuit 24 of increase electro-acoustic conversion efficiency.
Described signal generating circuit 21, driving circuit 22, power amplification circuit 23, impedance matching circuit 24 are connected successively, and described signal generating circuit 21 is also connected to described governor circuit 1, and described impedance matching circuit 24 is also connected to described electromagnetic ultrasonic transducer 2.
Wherein, described receiving circuit 30 comprises filtering and amplifying circuit 31 and the A/D Acquisition Circuit 32 of detectable voltage signals being carried out to amplification filtering processing;
Described filtering and amplifying circuit 31 is connected to respectively described electromagnetic ultrasonic transducer 2 and A/D Acquisition Circuit 32, and described A/D Acquisition Circuit 32 is also connected to governor circuit 1.
When detection, with reference to Figure 1B, electromagnetic ultrasonic transducer 2 is placed in to the top of detected grounded screen 10, realizes non-contacting corrosion and detect.Electromagnetic ultrasonic transducer 2 comprises transmitting coil and receiving coil.The pulse producing through signal generating circuit 21 is loaded into transmitting coil after power amplification, in the time that the electric current of arrival transmitting coil approaches 1A, in the time having outfield, will launch ultrasound wave, at close receiving coil place, the reflection wave of ultrasound wave after reflection or decay will produce vibration in conductor, this has just produced in receiving coil can be for the detectable voltage signals detecting, its received circuit 30 is sent to governor circuit after processing, governor circuit judges according to the detectable voltage signals after treatment receiving whether grounded screen top layer is corroded, for example, area change in the amplitude-time curve of detectable voltage signals, amplitude variation etc., if judge that grounded screen 10 is corroded, send alerting signal control warning circuit and report to the police.
Governor circuit in the preferred embodiment of the utility model ground net corrosion detection system and the circuit diagram of signal generating circuit with reference to figure 2;
Described governor circuit 1 comprises that model is the single-chip microcomputer U1 of AT89S52;
Described signal generating circuit 21 comprises DDS chip U2 for setting pulsed frequency, low-pass filter circuit and for setting the analog switch of impulse phase and number, in preferred embodiment, analog switch is the CPLD of MAX7064, and the model of described DDS chip U2 is AD9851;
P1.0 to the P1.7 pin of described single-chip microcomputer U1 connects one to one respectively to D0 to the D7 pin of DDS chip U2, the P3.0 pin of described single-chip microcomputer U1 is connected to the W_CLK pin of DDS chip U2, the P3.1 pin of single-chip microcomputer U1 is connected to the FQ_UD pin of DDS chip U2, single-chip microcomputer U1 is also connected to the control end of analog switch, the IOUT pin of described DDS chip U2 is connected to the input end of low-pass filter circuit, the output terminal of described low-pass filter circuit is connected to analog switch input end, and two output terminals of described analog switch are connected to driving circuit 22.
Pulse excitation comprises that monopulse excitation and broken hairdo train of impulses encourage two kinds, wherein broken hairdo train of impulses excitation has narrow-band characteristic, its concentration of energy is in required spectral range, can reach energy conversion efficiency, design the impedance-matching transformer of this arrowband also than being easier to simultaneously, therefore this novel in, the broken hairdo train of impulses excitation of employing.The control signal that above-mentioned active circuits 1 sends comprises the frequency of regulating impulse, 3 kinds of signals of phase place and number, be specially: single-chip microcomputer U1 controls the adjustable pulse that DDS chip U2 produces frequency 1kHz～1MHz, single-chip microcomputer U1 also control simulation switch completes train of impulses number and phase settings, complete the control of paired pulses string number and phase place in CPLD inside, by the P0 of single-chip microcomputer, P2 mouth is connected with CPLD as address and data-interface respectively, two data pin of single-chip microcomputer are as control port, when single-chip microcomputer writes the number of train of impulses and phase place after CPLD, just export the complementary unipolar pulse of two-way, it is two-way rp pulse, two-way pulse is input to respectively two input ports of driving circuit 22.
Fig. 3 is the circuit diagram of driving circuit, power amplification circuit and impedance matching circuit in the preferred embodiment of the utility model ground net corrosion detection system;
Described driving circuit 22 comprises two identical secondary drive circuit, and each secondary drive circuit comprises the first triode Q1 of NPN type, the second triode Q2 of NPN type, the 3rd triode Q3, the first capacitor C 1, the second capacitor C 2, the first resistance R 1 and second resistance R 2 of positive-negative-positive;
The base stage of described the first triode Q1 is connected to an output terminal of analog switch by the first resistance R 1, the grounded emitter of the first triode Q1, the collector of the first triode Q1 is connected to respectively the base stage of the second triode Q2, one end of the base stage of the 3rd triode Q3 and the second resistance R 2, the other end of the second resistance R 2 is connected to positive source, the emitter of the second triode Q2 is connected to the emitter of the 3rd triode Q3, the collector of the second triode Q2 is connected to positive source, the collector of the 3rd triode Q3 is connected to power cathode, power cathode ground connection, the base stage of the second triode Q2 is also connected to power amplification circuit 23 by the parallel branch of the first capacitor C 1 and the second capacitor C 2.
Described power amplification circuit 23 comprises the first metal-oxide-semiconductor Q5 of N-type, the second metal-oxide-semiconductor Q5 ', the first bridge balance resistance R3 of N-type, the second bridge balance resistance R3 ', the first brachium pontis capacitor C 4, the second brachium pontis capacitor C 4 ', the first diode D1, the second diode D1 '; Described impedance matching circuit 24 comprises transformer T1 and the 3rd capacitor C 3;
The base stage of the base stage of described the first metal-oxide-semiconductor Q5 and the second metal-oxide-semiconductor Q5 ' is connected to respectively corresponding secondary drive circuit, the source electrode of the first metal-oxide-semiconductor Q5 is connected to the drain electrode of the second metal-oxide-semiconductor Q5 ', the drain electrode of the first metal-oxide-semiconductor Q5 is connected to positive source, the source electrode of the second metal-oxide-semiconductor Q5 ' is connected to power cathode, the negative pole of the first diode D1 is connected to the source electrode of the first metal-oxide-semiconductor Q5, the positive pole of the first diode D1 is connected to the drain electrode of the first metal-oxide-semiconductor Q5 by the parallel branch of a capacitor C 4 and resistance R 5, the positive pole of the second diode D1 ' is connected to the drain electrode of the second metal-oxide-semiconductor Q5 ', the negative pole of the second diode D1 ' is connected to the source electrode of the second metal-oxide-semiconductor Q5 ' by the parallel branch of a capacitor C 4 ' and resistance R 5 ', one end of the primary coil of described transformer T1 is connected with the source electrode of the first metal-oxide-semiconductor Q5, the other end is connected to positive source and is connected to power cathode by the second bridge balance resistance R3 ' by the first bridge balance resistance R3 respectively, the first brachium pontis capacitor C 4 is in parallel with the first bridge balance resistance R3, the second brachium pontis capacitor C 4 ' is in parallel with the second bridge balance resistance R3 ', the secondary coil of described transformer T1 is connected to electromagnetic ultrasonic transducer 2 after connecting with the 3rd capacitor C 3.
The pulse power producing due to signal generating circuit 21 a little less than, the low metal-oxide-semiconductor being not enough in driving power amplifying circuit of voltage magnitude, therefore increases driving circuit 22, and it is amplified.In order to make the instantaneous power maximum of output, need to mate the impedance of probe, add compensating impedance at power amplification output terminal, induction reactance and the capacitive reactance of whole circuit are offseted, make electricity/sound conversion efficiency reach maximization, between power amplification circuit 23 and electromagnetic ultrasonic transducer 2, increased impedance matching circuit 24.
The above-mentioned two-way rp pulse producing through analog switch is sent to respectively respectively the base stage of the first metal-oxide-semiconductor Q5 and the second metal-oxide-semiconductor Q5 ' after corresponding secondary drive circuit, when the base stage of the first metal-oxide-semiconductor Q5 is high level, when the base stage of the second metal-oxide-semiconductor Q5 ' is low level, Q5 conducting, Q5 ' closes, electric current primary coil by transformer T1 after Q5 charges to C4 ', electric charge on C4 discharges to the primary coil of Q5 and transformer T1 simultaneously, thereby responds to a positive half period pulse voltage at the secondary coil of transformer T1; When the base stage of the first metal-oxide-semiconductor Q5 is low level, the base stage of the second metal-oxide-semiconductor Q5 ' is high level, Q5 ' conducting, Q5 closes, electric current charges to C4 by the primary coil of transformer T1 after Q5 ', and the electric charge of C4 ' is also via the primary coil electric discharge of transformer T1, senses a negative half-cycle pulse voltage at transformer T1 secondary coil, thereby form the pulse of the power amplification in a frequency of operation cycle.Because metal-oxide-semiconductor is operated in saturation region or the cut-off region of volt-ampere characteristic, collector power consumption drops to bottom line, thereby has improved the energy conversion efficiency of amplifier, makes it can reach more than 80%.
Fig. 4 is the circuit diagram of the filtering and amplifying circuit in the preferred embodiment of the utility model ground net corrosion detection system;
Filtering and amplifying circuit 31 comprises the first amplifier U3A, the second amplifier U3B, the 3rd amplifier U4; Wherein the first amplifier U3A and the second amplifier U3B are used for forming two-stage pre-amplification circuit, and the 3rd amplifier U4 is used for forming second-order bandpass filter.
The signal of preposition amplification processing is the source of subsequent treatment, is that low noise is amplified so just require it.Amplify in order to realize low noise, in the utility model, adopt the two-stage instrument being formed by two amplifiers to amplify.The enlargement factor of resonance-amplifier only need regulate the resistance of gain resistor Rz, and the change of the change of enlargement factor and gain resistor Rz resistance is directly proportional.
In the second-order bandpass filter being formed by the 3rd amplifier U4, regulate R10 gain adjustable, can affect centre frequency simultaneously; Regulate the bandwidth of R20 adjustable band pass filter; Regulated ground resistance R 30 can regulate DC maladjustment.
Can directly last detectable voltage signals be shown by oscillograph, the operating personnel of specialty determine whether the degree that has corrosion and corrosion by analyzed pattern, for the detection of hommization more, in the utility model, the detectable voltage signals after treatment such as amplification filtering being sent to single-chip microcomputer judges, comprehensively judge whether to exist corrosion according to increase of the variation of the area under the curve in the amplitude-time curve of detectable voltage signals, amplitude etc., and in the time there is corrosion, carry out warning reminding.
Circuit diagrams of the warning circuit in the preferred embodiment of the utility model ground net corrosion detection system with reference to figure 5.
Described warning circuit 3 comprises the 4th triode Q4, hummer B1 and light emitting diode D2;
The base stage of described the 4th triode Q4 is connected to single-chip microcomputer U1 by resistance R 50, the grounded emitter of described the 4th triode Q4, the collector of described the 4th triode Q4 is connected to the negative pole of light emitting diode D2, the positive pole of light emitting diode D2 is connected to the negative pole of hummer B1, and the positive pole of hummer B1 is connected to positive source.
Once single-chip microcomputer U1 judges ground net corrosion, the base stage of PWM ripple to the four triode Q4 of output different frequency, cause hummer B1 to send different prompt tones, and light emitting diode D2 can ceaselessly glimmer.
In sum, in the utility model, utilizing electromagnetic ultrasonic transducer to realize with the non-contacting corrosion in grounded screen surface detects, without adding, entering tone brings disaster upon mixture, reproducible, detection speed is high, and in the time corrosion being detected, remind staff by warning circuit, convenient and simple, reduce the requirement to operating personnel, more hommization.
By reference to the accompanying drawings embodiment of the present utility model is described above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; not departing from the scope situation that the utility model aim and claim protect, also can make a lot of forms, within these all belong to protection of the present utility model.
Claims (7)
1. a ground net corrosion detection system, is characterized in that, comprises governor circuit (1), energizing circuit (20), is placed in electromagnetic ultrasonic transducer (2), receiving circuit (30) and the warning circuit (3) of grounded screen (10) top;
Described energizing circuit (20), receiving circuit (30) and warning circuit (3) are connected to respectively described governor circuit (1), and described energizing circuit (20) and receiving circuit (30) are also connected to respectively described electromagnetic ultrasonic transducer (2);
Described governor circuit (1) is for sending a control signal to energizing circuit (20), described energizing circuit (20) for according to described control signal production burst to described electromagnetic ultrasonic transducer (2), described electromagnetic ultrasonic transducer (2) is for producing the ultrasound wave transmitting along described grounded screen (10) surface and the concurrent detectable voltage signals of sending of reflection wave that receives described grounded screen (10) surface reflection to receiving circuit (30) according to pulse, described receiving circuit (30) is sent to described governor circuit (1) for described detectable voltage signals is carried out after amplification filtering processing, described governor circuit (1) also for sending alerting signal to warning circuit (3) according to described detectable voltage signals in the time that grounded screen (10) is corroded, described warning circuit (3) is for receiving alerting signal and reporting to the police.
2. ground net corrosion detection system according to claim 1, it is characterized in that, described energizing circuit (20) comprises the signal generating circuit (21) for generation of pulse, the driving circuit (22) that the voltage magnitude of pulse is amplified, pulse power is amplified to increase the power amplification circuit (23) of ultrasonic intensity, the impedance matching circuit (24) of increase electro-acoustic conversion efficiency;
Described signal generating circuit (21), driving circuit (22), power amplification circuit (23), impedance matching circuit (24) are connected successively, described signal generating circuit (21) is also connected to described governor circuit (1), and described impedance matching circuit (24) is also connected to described electromagnetic ultrasonic transducer (2).
3. ground net corrosion detection system according to claim 2, is characterized in that,
Described governor circuit (1) comprises that model is the single-chip microcomputer (U1) of AT89S52;
Described signal generating circuit (21) comprises DDS chip (U2) for setting pulsed frequency, low-pass filter circuit and for setting the analog switch of impulse phase and number, the model of described DDS chip (U2) is AD9851;
P1.0 to the P1.7 pin of described single-chip microcomputer (U1) connects one to one respectively to D0 to the D7 pin of DDS chip (U2), the P3.0 pin of described single-chip microcomputer (U1) is connected to the W_CLK pin of DDS chip (U2), the P3.1 pin of single-chip microcomputer (U1) is connected to the FQ_UD pin of DDS chip (U2), single-chip microcomputer (U1) is also connected to the control end of analog switch, the IOUT pin of described DDS chip (U2) is connected to the input end of low-pass filter circuit, the output terminal of described low-pass filter circuit is connected to analog switch input end, two output terminals of described analog switch are connected to driving circuit (22).
4. ground net corrosion detection system according to claim 3, it is characterized in that, described driving circuit (22) comprises two identical secondary drive circuit, and each secondary drive circuit comprises the first triode (Q1), the second triode (Q2), the 3rd triode (Q3), the first electric capacity (C1), the second electric capacity (C2), the first resistance (R1) and the second resistance (R2);
The base stage of described the first triode (Q1) is connected to an output terminal of analog switch by the first resistance (R1), the grounded emitter of the first triode (Q1), the collector of the first triode (Q1) is connected to respectively the base stage of the second triode (Q2), one end of the base stage of the 3rd triode (Q3) and the second resistance (R2), the other end of the second resistance (R2) is connected to positive source, the emitter of the second triode (Q2) is connected to the emitter of the 3rd triode (Q3), the collector of the second triode (Q2) is connected to positive source, the collector of the 3rd triode (Q3) is connected to power cathode, power cathode ground connection, the base stage of the second triode (Q2) is also connected to power amplification circuit (23) by the first electric capacity (C1) and the parallel branch of the second electric capacity (C2).
5. ground net corrosion detection system according to claim 4, it is characterized in that, described power amplification circuit (23) comprises the first metal-oxide-semiconductor (Q5), the second metal-oxide-semiconductor (Q5 '), the first bridge balance resistance (R3), the second bridge balance resistance (R3 '), the first brachium pontis electric capacity (C4), the second brachium pontis electric capacity (C4 '), the first diode (D1), the second diode (D1 '); Described impedance matching circuit (24) comprises transformer (T1) and the 3rd electric capacity (C3);
The base stage of the base stage of described the first metal-oxide-semiconductor (Q5) and the second metal-oxide-semiconductor (Q5 ') is connected to respectively corresponding secondary drive circuit, the source electrode of the first metal-oxide-semiconductor (Q5) is connected to the drain electrode of the second metal-oxide-semiconductor (Q5 '), the drain electrode of the first metal-oxide-semiconductor (Q5) is connected to positive source, the source electrode of the second metal-oxide-semiconductor (Q5 ') is connected to power cathode, the negative pole of the first diode (D1) is connected to the source electrode of the first metal-oxide-semiconductor (Q5), the positive pole of the first diode (D1) is connected to the drain electrode of the first metal-oxide-semiconductor (Q5) by the parallel branch of an electric capacity and resistance, the positive pole of the second diode (D1 ') is connected to the drain electrode of the second metal-oxide-semiconductor (Q5 '), the negative pole of the second diode (D1 ') is connected to the source electrode of the second metal-oxide-semiconductor (Q5 ') by the parallel branch of an electric capacity and resistance, one end of the primary coil of described transformer (T1) is connected with the source electrode of the first metal-oxide-semiconductor (Q5), the other end of primary coil is connected to positive source and is connected to power cathode by the second bridge balance resistance (R3 ') by the first bridge balance resistance (R3) respectively, the first brachium pontis electric capacity (C4) is in parallel with the first bridge balance resistance (R3), the second brachium pontis electric capacity (C4 ') and the second bridge balance resistance (R3 ') in parallel, the secondary coil of described transformer (T1) is connected to electromagnetic ultrasonic transducer (2) after connecting with the 3rd electric capacity (C3).
6. ground net corrosion detection system according to claim 3, is characterized in that, described warning circuit (3) comprises the 4th triode (Q4), hummer (B1) and light emitting diode (D2);
The base stage of described the 4th triode (Q4) is connected to single-chip microcomputer (U1), the grounded emitter of described the 4th triode (Q4), the collector of described the 4th triode (Q4) is connected to the negative pole of light emitting diode (D2), the positive pole of light emitting diode (D2) is connected to the negative pole of hummer (B1), and the positive pole of hummer (B1) is connected to positive source.
7. ground net corrosion detection system according to claim 1, is characterized in that, described receiving circuit (30) comprises filtering and amplifying circuit (31) and the A/D Acquisition Circuit (32) of detectable voltage signals being carried out to amplification filtering processing;
Described filtering and amplifying circuit (31) is connected to respectively described electromagnetic ultrasonic transducer (2) and A/D Acquisition Circuit (32), and described A/D Acquisition Circuit (32) is also connected to governor circuit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420059625.0U CN203705400U (en) | 2014-02-08 | 2014-02-08 | Grounding grid corrosion detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420059625.0U CN203705400U (en) | 2014-02-08 | 2014-02-08 | Grounding grid corrosion detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109641720A (en) * | 2016-08-24 | 2019-04-16 | 因温特奥股份公司 | For determining the method and test device of the state of the suspension traction device of elevator system |
| CN112229791A (en) * | 2020-09-23 | 2021-01-15 | 南京电力设计研究院有限公司 | Grounding body underground device for detecting corrosion degree in real time |
-
2014
- 2014-02-08 CN CN201420059625.0U patent/CN203705400U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109641720A (en) * | 2016-08-24 | 2019-04-16 | 因温特奥股份公司 | For determining the method and test device of the state of the suspension traction device of elevator system |
| CN112229791A (en) * | 2020-09-23 | 2021-01-15 | 南京电力设计研究院有限公司 | Grounding body underground device for detecting corrosion degree in real time |
| CN112229791B (en) * | 2020-09-23 | 2023-01-03 | 南京电力设计研究院有限公司 | Grounding body underground device for detecting corrosion degree in real time |
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