CN111812179A - Concrete sensor's drive detection circuitry and check out test set - Google Patents
Concrete sensor's drive detection circuitry and check out test set Download PDFInfo
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Abstract
The invention discloses a driving detection circuit and detection equipment of a concrete sensor, which comprise a signal giving module, a channel selection module and a processing module, wherein the signal giving module can be connected with the concrete sensor and can output a given signal, the channel selection module comprises a plurality of acquisition ends, each acquisition end can be correspondingly connected with each detection electrode of the concrete sensor, the processing module is respectively connected with the signal giving module and the channel selection module, the processing module can control the given signal output by the signal giving module, the processing module can respectively control the acquisition ends of the channel selection module to work and acquire the acquisition signal of the channel selection module to the concrete sensor, the design can formulate a plurality of driving acquisition strategies to different detection electrodes of the concrete sensor, thereby rapidly detecting the characteristics of the different detection electrodes, the state condition of the concrete structure is known, and the detection efficiency is improved.
Description
Technical Field
The invention relates to the field of bridge and tunnel quality inspection, in particular to a driving detection circuit and detection equipment of a concrete sensor.
Background
At present, in buildings such as bridges, tunnels, parking lots and the like, concrete reinforcement structures are easily affected with damp, and the existing concrete sensors for detecting the aging degree of the concrete reinforcement structures generally comprise a detection electrode, wherein the detection electrode generally comprises a plurality of steel anodes, titanium oxide cathodes, steel bar electrodes, a PT1000 temperature sensor and the like; measurement of the electrolyte resistivity between adjacent steel anodes allows the determination of the moisture distribution within the concrete.
For the driving detection of the concrete sensor, because the detection items are more, different devices need to be adopted aiming at different detection items in the past, even for the parameter measurement between different electrodes, the positions of the acquisition ends connected to different electrodes need to be manually replaced by workers, so that the corresponding parameters are detected, the operation of the workers is troublesome, the detection efficiency is low, and the equipment cost is higher because a plurality of devices need to be adopted.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a driving detection circuit of a concrete sensor, which can be used for rapidly detecting each parameter and improving the detection efficiency.
The invention also provides detection equipment which is high in detection efficiency and low in detection cost.
According to a first aspect embodiment of the present invention, a drive detection circuit of a concrete sensor includes: the signal giving module can be connected with the concrete sensor and can output a given signal; the channel selection module comprises a plurality of acquisition ends, and each acquisition end can be correspondingly connected with each detection electrode of the concrete sensor; the processing module is respectively connected with the signal giving module and the channel selection module, the processing module can control given signals output by the signal giving module, and the processing module can respectively control the acquisition end of the channel selection module to work and acquire the acquisition signals of the channel selection module to the concrete sensor.
The driving detection circuit of the concrete sensor according to the embodiment of the invention has at least the following beneficial effects:
according to the driving detection circuit of the concrete sensor, the channel selection module can switch different acquisition ends to work, so that the characteristics of different detection electrodes in the concrete sensor are detected, meanwhile, the processing module can control given signals output by the signal giving module, and the design processing module can make various driving acquisition strategies for different detection electrodes of the concrete sensor through controlling the signal giving module and the channel selection module, so that the characteristics of different detection electrodes can be quickly detected, the state condition of a concrete structure can be known, and the detection efficiency is improved.
According to some embodiments of the present invention, the processing module includes a main control module and a signal conversion module, the main control module is respectively connected to the signal providing module and the channel selecting module, the main control module can control the given signal output by the signal providing module, the main control module can respectively control the operation of the acquisition end of the channel selecting module, and the signal conversion module is respectively connected to the main control module and the channel selecting module to input the acquisition signal of the concrete sensor to the main control module.
According to some embodiments of the present invention, the signal conversion module includes a signal amplification unit and an analog-to-digital conversion unit, and the channel selection module, the signal amplification unit, the analog-to-digital conversion unit, and the main control module are sequentially connected.
According to some embodiments of the present invention, the channel selection module is an electrical detection module, the electrical detection module is connected to the signal conversion module, the plurality of collection terminals are connected to the electrical detection module, and the main control module is connected to the electrical detection module to control different collection terminals to operate to collect electrical characteristics between different detection electrodes.
According to some embodiments of the present invention, the electrical property detection module includes a first channel collection unit and a first channel switching unit, an output end of the first channel collection unit is connected to the signal conversion module, one pole of a detection end of the first channel collection unit is connected to one collection end thereof, the other pole of the detection end of the first channel collection unit is connected to the first channel switching unit, a part of the collection ends are connected to the first channel switching unit, the main control module is connected to the first channel switching unit to switch different collection ends of the first channel collection unit to communicate with the other pole of the detection end of the first channel collection unit, and the first channel collection unit can detect a voltage between the two collection ends.
According to some embodiments of the present invention, the electrical property detection module further includes a first switch unit and a first sampling resistor, the first switch unit and the first sampling resistor form a first serial branch, the main control module is connected to the first switch unit to control the first switch unit to be turned on or off, one end of the first serial branch is connected to one pole of the detection end of the first channel acquisition unit, and the other end of the first serial branch is connected to the turned-on acquisition end through the first channel switching unit.
According to some embodiments of the present invention, the electrical property detection module further includes a second channel collection unit, a second channel switching unit, a second sampling resistor, and a second switch unit, the second switch unit is respectively connected to one pole of the detection end of the first channel collection unit and one collection end thereof, the main control module is connected to the second switch unit to control the second switch unit to be turned on or off, the signal given module is respectively connected to the other pole of the detection end of the first channel collection unit and one pole of the detection end of the second channel collection unit, a part of the collection ends are connected to the second channel switching unit, one end of the second sampling resistor is connected to the second channel switching unit, the main control module is connected to the second channel switching unit to switch different collection ends of the second channel switching unit to be communicated with one end of the second sampling resistor, and a second series branch is formed between the second sampling resistor and the collection end communicated with the second channel switching unit and between the second sampling resistor and the collection end communicated with the first channel switching unit, and the signal given module is respectively connected with two ends of the second series branch.
According to some embodiments of the present invention, the collecting end has a plurality of anode collecting ends, a plurality of cathode collecting ends and a plurality of reinforcing bar electrode collecting ends, the cathode collecting ends are connected to the second switch unit, the plurality of anode collecting ends are connected to the first channel switching unit and the second channel switching unit, respectively, and the reinforcing bar electrode collecting ends are connected to the first channel switching unit or the second channel switching unit.
According to some embodiments of the present invention, the signal setting module includes a signal modulation unit and a third switching unit, the signal modulation unit is capable of outputting at least one constant frequency pulse signal as a setting signal, the signal modulation unit outputs a setting signal for the second serial branch through the third switching unit, and the main control module is connected to the third switching unit to control on and off of the third switching unit.
According to a second aspect embodiment of the invention, the detection device comprises a concrete sensor driving detection circuit disclosed in any one of the above embodiments.
The detection device provided by the embodiment of the invention at least has the following beneficial effects:
the detection equipment provided by the invention utilizes the drive detection circuit disclosed by any embodiment to carry out data acquisition on the concrete sensor, one equipment finishes various acquisition strategies, the detection efficiency is high, and the detection cost is reduced.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a schematic structure of a driving detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a main control module of a driving detection circuit according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a power supply module of the driving detection circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a signal providing module of the driving detection circuit according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a channel selection module of a driving detection circuit according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a first switch unit, a second switch unit and a third switch unit of a driving detection circuit according to an embodiment of the invention;
FIG. 7 is a circuit diagram of a signal conversion module of the driving detection circuit according to an embodiment of the present invention;
FIG. 8 is an equivalent circuit diagram of the drive detection circuit for open-circuit potential detection according to the embodiment of the present invention;
FIG. 9 is an equivalent circuit diagram of the drive detection circuit versus the corrosion current detection of the embodiment of the present invention;
fig. 10 is an equivalent circuit diagram of the drive detection circuit for detecting the resistance between the electrodes according to the embodiment of the present invention.
Reference numerals:
the signal processing device comprises a signal giving module 100, a signal modulation unit 110, a third switching unit 120, a channel selection module 200, a first channel acquisition unit 210, a first channel switching unit 220, a second channel acquisition unit 230, a second channel switching unit 240, a processing module 300, a main control module 310, a signal conversion module 320, a signal amplification unit 321, an analog-to-digital conversion unit 322, a first switching unit 400, a second switching unit 500 and a power supply module 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the positional or orientational descriptions referred to, for example, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the positional or orientational relationships shown in the drawings and are for convenience of description and simplicity of description only, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 10, a concrete sensor driving detection circuit according to an embodiment of the present invention includes a signal giving module 100, a channel selecting module 200, and a processing module 300, where the signal giving module 100 can be connected to a concrete sensor and can output a given signal, the channel selecting module 200 includes a plurality of collecting terminals, each of which can be correspondingly connected to each of detecting electrodes of the concrete sensor, the processing module 300 is respectively connected to the signal giving module 100 and the channel selecting module 200, the processing module 300 can control the given signal output by the signal giving module 100, and the processing module 300 can respectively control the collecting terminals of the channel selecting module 200 to operate and acquire the collected signal of the concrete sensor by the channel selecting module 200.
It should be noted that the concrete sensor is an anode ladder sensor, which includes a plurality of detection electrodes, the detection electrodes are generally divided into six metal steel bars (anode bars a1-a6), one anode metal steel bar (actually, a support steel bar when a cement pier is embedded in cement, namely, a steel bar electrode CR), and one metal steel bar (cathode bar C) which is titanium oxide, when the concrete sensor is used, the concrete sensor is embedded in concrete, the six anode bars are adjacent and arranged together, when the concrete is corroded by seawater or other corrosive substances, and water vapor permeates to the position where the concrete sensor is embedded, the six anode bars are corroded by chloride ions and water vapor, the insulating protective film on the surface starts to be corroded, the steel bars are exposed, the anode bars between two pairs form a primary cell reaction by taking the concrete and impurities as electrolytes, the resistance between the two metal steel bar electrodes is the internal resistance of the primary cell, the greater the degree of corrosion, the lower the resistance. The corrosion degree of the cement structure can be judged by indirectly reflecting the position of the steel bar corroded by water vapor through the parameters. The six anode rods and the steel bar electrodes respectively generate galvanic reaction with the cathode rods through corrosion, and the corrosion degree is reflected by respectively measuring voltage and current.
According to the driving detection circuit of the concrete sensor, the channel selection module 200 can switch different acquisition ends to work, so that the characteristics of different detection electrodes in the concrete sensor are detected, meanwhile, the processing module 300 can control given signals output by the signal given module 100, and the design processing module 300 can make various driving acquisition strategies for different detection electrodes of the concrete sensor through controlling the signal given module 100 and the channel selection module 200, so that the characteristics of different detection electrodes can be quickly detected, the state condition of a concrete structure can be known, and the detection efficiency is improved.
In some embodiments of the present invention, the processing module 300 includes a main control module 310 and a signal conversion module 320, the main control module 310 is connected to the signal providing module 100 and the channel selection module 200 respectively, the main control module 310 can control a given signal output by the signal providing module 100, the main control module 310 can control an acquisition end of the channel selection module 200 to work respectively, and the signal conversion module 320 is connected to the main control module 310 and the channel selection module 200 respectively to input an acquisition signal of the concrete sensor to the main control module 310.
As shown in fig. 2, the main control module 310 may be composed of an MCU or a CPU and peripheral circuits thereof, and specifically, the signal conversion module 320 includes a signal amplification unit 321 and an analog-to-digital conversion unit 322, and the channel selection module 200, the signal amplification unit 321, the analog-to-digital conversion unit 322 and the main control module 310 are sequentially connected.
As part of the signals detected from the concrete sensor are relatively weak, as shown in fig. 7, the signal amplification unit 321 can be selected from a conventional signal amplification chip, and the analog-to-digital conversion unit 322 performs analog-to-digital conversion on the signals amplified by the signal amplification unit 321 and then inputs the signals into the main control module 310, so that the corrosion condition of the concrete structure can be analyzed and judged.
The signal amplifying unit 321 is a low-drift low-noise signal amplifier U3, and the amplification factor can be changed by controlling the high and low levels of the pins of the chips 6-9. The analog-to-digital conversion unit 322 uses a high-precision ADC U2 for encoding and converting the differential voltage signal into a digital signal for the microprocessor to read and process, the voltages inputted by the input terminals IN + and IN-of the signal amplifier U3 are amplified and then transmitted to the input terminal + IN of the high-precision ADC U2 through the output terminal OUT, and the input voltage is converted into a digital code by the high-precision ADC U2.
In some embodiments of the present invention, the channel selection module 200 is an electrical detection module, the electrical detection module is connected to the signal conversion module 320, the plurality of collection terminals are connected to the electrical detection module, and the main control module 310 is connected to the electrical detection module to control the different collection terminals to work to collect electrical characteristics between different detection electrodes, wherein the electrical characteristics include voltage, current and/or resistance between the detection electrodes.
In some embodiments of the present invention, as shown in fig. 5 and 8, the electrical property detection module includes a first channel collection unit 210 and a first channel switching unit 220, an output end of the first channel collection unit 210 is connected to the signal conversion module 320, one pole of a detection end of the first channel collection unit 210 is connected to one collection end thereof through a second switch unit 500, the other pole of the detection end of the first channel collection unit 210 is connected to the first channel switching unit 220, a part of the collection ends are connected to the first channel switching unit 220, the main control module 310 is connected to the first channel switching unit 220 to switch different collection ends of the first channel unit to be communicated to the other pole of the detection end of the first channel collection unit 210, and the first channel collection unit 210 can detect a voltage between the two collection ends.
The first channel acquisition unit 210 can be selected from a conventional voltage detection chip, the first channel switching unit 220 can be selected from a conventional channel switching chip, or an electrically controlled multi-throw switch can be adopted to realize switching of communication between different acquisition ends of the first channel unit and the other electrode of the detection end of the first channel acquisition unit 210, detection of corrosion voltage between detection electrodes can be realized by using the structure of the first channel switching unit, and the first channel switching unit 220 can be switched to be connected with different detection electrodes, so that the corrosion voltage between a titanium oxide cathode and different anode electrodes can be measured.
In some embodiments of the present invention, as shown in fig. 5, 6, and 9, the electrical property detection module further includes a first switch unit 400 and a first sampling resistor, the first switch unit 400 and the first sampling resistor form a first serial branch, the main control module 310 is connected to the first switch unit 400 to control on/off of the first switch unit 400, one end of the first serial branch is connected to one pole of the detection end of the first channel acquisition unit 210, and the other end of the first serial branch is connected to the conducted acquisition end through the first channel switching unit 220.
The first switch unit 400 can be selected from a conventional electronic control switch chip, and the anode rods between two pairs of the first switch unit form a galvanic cell reaction by using concrete and impurities as electrolytes, as shown in fig. 6 and 9, the first sampling resistor is a resistor R17, the anode rods between two pairs of the first switch unit form a power supply loop through the first sampling resistor, detect the voltage of the first sampling resistor, and divide the voltage by the resistance of the first resistor to obtain a corrosion current, and the first switch unit 220 can be switched to connect with different detection electrodes, so as to measure the corrosion current between the titanium oxide cathode and different anode electrodes.
The first switch unit 400 adopts a controllable switch U9, the on-off of a channel D-S IN the switch is controlled by controlling the high-low level of an IN pin on a U9, a channel port D is connected with a first sampling resistor R17, the other end of the R17 is connected with a port S1b, and a channel port S is connected with a port COMB.
In some embodiments of the present invention, as shown in fig. 5, 6, and 10, the electrical property detection module further includes a second channel collection unit 240, a second channel switching unit 240, a second sampling resistor, and a second switch unit 500, the second switch unit 500 is respectively connected to one pole of the detection end of the first channel collection unit 210 and one collection end thereof, the main control module 310 is connected to the second switch unit 500 to control the on/off of the second switch unit 500, the signal given module 100 is respectively connected to the other pole of the detection end of the first channel collection unit 210 and one pole of the detection end of the second channel collection unit 240, a part of the collection ends are connected to the second channel switching unit 240, one end of the second sampling resistor is connected to the second channel switching unit 240, the main control module 310 is connected to the second channel switching unit 240 to switch the connection between the different collection ends of the second channel switching unit 240 and one end of the second sampling resistor, a second series branch is formed between the second sampling resistor and the collection end communicated with the second channel switching unit 240 and between the second sampling resistor and the collection end communicated with the first channel switching unit 220, and the signal given module 100 is connected with two ends of the second series branch respectively.
The control signal giving module 100 supplies power to the second series branch, specifically, excitation passing a 10.8Hz voltage signal can be output, a second sampling resistor and the inter-electrode equivalent resistance form voltage division, the first channel acquisition unit 210 can detect the relative voltage of the COMB point, and the second channel acquisition unit 240 can detect the relative voltage of the COMB point.
The first channel switching unit 220 and the second channel switching unit 240 can switch the connection with different detection electrodes, so as to measure the resistance between different electrodes.
The second switch unit 500 is a controllable switch U13, the switching on and off of a channel NO-COM IN the switch is controlled by controlling the high and low levels of the IN pin on the U13, the channel port NO is connected to the S1b port, and the channel port COM is connected to the cathode bar.
As shown in fig. 5, the first channel acquisition unit 210 and the second channel acquisition unit 240 may directly adopt integrated two-way multi-channel input and single-channel output multiplexing switches U14 and U15, the first channel switching unit 220 and the second channel switching unit 240 may adopt 8-channel input and single-channel output multiplexing switches U16 and U17, the main control module 310 may be directly connected to U16 and U17 to control different channels to conduct, U16 and U17 may be respectively driven by U14 and U15, and U14 and U15 may be chips capable of acquiring voltage and driving U16 and U17 channels to switch.
IN the first channel collection unit 210U14 and the second channel collection unit 240U5, the inputs of the input terminals s1a-s4a are output through the Da terminal, the inputs of the input terminals s1b-s4b are output through the Db terminal, and the Da terminal and the Db terminal of the output terminal are both connected to the input ports IN + and IN-of the signal amplifier U3, and then output to the signal amplifier to be read by the signal amplifier U3.
U14, U15 can select the corresponding channel to open by controlling the high and low levels of pins A0, A1, the channel 1 input end of U14 is connected with ports COMA and COMB respectively, when selecting channel 1, Da and Db will output the voltage between COMA and COMB to the signal amplifier U3 input end, the channel 2 input end is connected with 2V power input and COMB port respectively, when selecting channel 2, Da and Db will output the voltage difference between 2V power and COMB. Channel 1 of U15 is connected to the S1b port and the COMB port, Da and Db will output a voltage between S1b and COMB to the input of signal amplifier U3 when channel 1 is selected, and channel 2 inputs are connected to the COMB and S1b ports, respectively, in reverse to the connection of channel 1, Da and Db will output a voltage between COMB and S1b to the input of signal amplifier U3 when channel 2 is selected. Specifically, the input terminal is NO1-NO8, the output terminal is COM, and the high and low levels of three pins of a0, a1 and a2 are controlled to realize that a specified channel and a COM port are opened to form a channel, and pins a0, a1 and a2 of U16 and U17 use the same level signal, that is, the channels opened by the two chips U16 and U17 are the same when the three-pin level signal is stable. U16 the ports of eight channels NO1-NO8 are connected in sequence from NO2B-NO8A on the signal input-output port J1. U17 the ports of eight channels NO1-NO8 are connected in sequence from NO1B-NO8B on the signal input-output port J1 in sequence. The output port of U16 is connected to the COMA port, and this port passes through pull-up resistance R10 and connects 2V power, provides fixed 2V power input for the COMA port. The signal input/output port J1 is connected with the input end of an external concrete sensor, and is respectively connected with the input of six anode bars, the input of a steel bar electrode, 2 input ports of a pt1000 temperature sensor and the input of a cathode bar from the ports 1-10 defined by pins.
In some embodiments of the present invention, as shown in fig. 3 and 4, the power supply module 600 may be selected from a conventional rectification voltage-reduction circuit, the power supply module 600 may be externally connected with an external alternating current or a direct current, and process the voltage to supply power to each part of the driving detection circuit, the signal setting module 100 includes a signal modulation unit 110 and a third switching unit 120, the signal modulation unit 110 is powered by the power supply module 600, the signal modulation unit 110 is capable of outputting at least one constant-frequency pulse signal as a set signal, the signal modulation unit 110 outputs the set signal to the second serial branch through the third switching unit 120, and the main control module 310 is connected to the third switching unit 120 to control the third switching unit 120 to turn on or off.
The signal modulation unit 110 may adopt a low-noise rail-to-rail dual-channel output operational amplifier U9, a voltage output source is formed by voltage dividing resistors R13, R14, R15, and R16, a 10.8Hz 3.3V signal is input to the input terminal of the PA1, and 1.45V and 2.45V voltages are output to the output terminal D1 for use by a subsequent measurement circuit. The third switch unit 120 is a controllable electronic switch U11, and can switch on and off the channels S and D by controlling the level of the enable pin IN, and the pins S and D are connected to the COMB port and the output port D1, respectively, so as to connect the outputs of the COMB port and D1 into a channel, and output the applied voltage to the COMB port.
Specifically, in the measurement process, the cathode collecting end is connected to the second switch unit 500, the plurality of anode collecting ends are respectively connected to the first channel switching unit 220 and the second channel switching unit 240, the reinforcing steel bar electrode collecting end is connected to the first channel switching unit 220 or the second channel switching unit 240, the cathode collecting end is used for being connected to the cathode bar C, the reinforcing steel bar electrode collecting end is connected to the reinforcing steel bar electrode CR, and the anode collecting ends are respectively and correspondingly connected to the anode bars a1-a 6.
In the concrete structure, when the open-circuit potential between the anode bar and the titanium oxide cathode bar C needs to be collected, the high level is started through an enable pin EN of U15, and a channel selection pin A0 is controlled, A1 is in the low level, namely, the channel 1 is selected to be opened, and the voltage between the output Da and Db of U14 is the voltage of S1b and COMB. The electronic switch U13 is enabled, and the S1b port is connected with the oxidation state cathode C. The U17 enable pin EN is set to be high level to turn on the switch, the A2 pin is low level by controlling A0, A1 and is the selection channel 1, the COMB is communicated with the NO1B of the signal input/output port J1, the voltage at two ends of the COMB and S1b is the voltage between NO1B and NO, the open circuit potential between the steel anode rod A1 and the oxidation state cathode C is the open circuit potential, and the voltage signals of the COMB and S1b are amplified by the signal amplifier U3 and output to the high-precision ADCU2 for sampling and converting into voltage digital quantity for the main control module 310 to read. The voltage acquisition of the rest anode rods A2-A6, the steel bar electrodes CR and the titanium oxide cathode rods C is acquired as the method, and the level values of pins A0, A1 and A2 of U17 (selected according to a truth table of a chip) are only needed to be controlled to select the channel connected with the following NO2B-NO7B, so that the channel conversion and the voltage conversion are completed.
In a concrete structure, when short-circuit corrosion current between an anode bar and a titanium oxide cathode bar C needs to be collected, an enable pin EN of U15 is enabled at a high level, a channel selection pin A0 and A1 are controlled to be at a low level, namely, a channel 1 is selectively opened, an electronic switch U13 is enabled, and a port S1b is communicated with an oxidation state cathode C. The enable pin EN of the U17 is set to high level to turn on the switch, and the channel 1 is selected by controlling the pins a0, a1 and a2 to low level, at this time, COMB will communicate with NO1B of the signal input/output port J1. Enabling an enabling pin of an electronic switch U12, communicating a port D with an S channel, communicating S1b with COMB through a first sampling resistor R17, namely, connecting a steel anode bar A1 with a titanium oxide cathode bar C through a first sampling resistor R17 in a short circuit mode, wherein the voltage between output Da and Db of U14 is the voltage at two ends of the first sampling resistor R17, and the current flowing through the first sampling resistor R17 is the short-circuit current of the steel anode bar A1 and the titanium oxide cathode bar C. At this time, the voltage signals of COMB and S1b are amplified by the signal amplifier U3 and output to the high-precision ADC U2 for sampling and converting into voltage digital quantity for the main control module 310 to read, and the short-circuit current can be obtained by the voltage at the two ends of the first sampling resistor R17 according to the ohm' S law formula. And the short-circuit current acquisition of the remaining steel anode rods A2-A6, the steel bar electrodes CR and the titanium oxide cathodes C is acquired as in the method, and only the pin level values of A0, A1 and A2 of U17 (selected according to a truth table of a chip) are needed to be controlled to select the channel connected with the following NO2B-NO7B, so that channel conversion and voltage conversion are completed.
In a concrete structure, when the resistivity of an electrolyte between two adjacent anodes needs to be collected, the high level is started by giving the enable pin EN of U14 high level, and the channel selection pin A0 and A1 are controlled to be low level, namely, the channel 1 is selected to be opened, and at the moment, the output ends Da and Db of U14 are voltages between COMB and COMA. The enable pin EN of U17 is set to high level to turn on the switch, and the pins A0, A1 and A2 are controlled to low level, that is, channel 1 is selected, at this time, COMB is communicated with NO1B of the signal input/output port J1. The enable pin EN of U16 is set to high level to turn on the switch, and the pins A0, A1 and A2 are controlled to low level, that is, channel 1 is selected, at this time, COMB is communicated with NO2B of the signal input/output port J1. Namely, the voltages at the two ends of the output terminals Da and Db of the U14 are NO1B and NO 2B. At this time, a high-low level signal with a frequency of 10.8Hz is applied to the input terminal PA1 of the operational amplifier U9, the electronic switch U11 is enabled, at this time, the output of the output port D1 of the operational amplifier U9 will be output to the COMB port, the output port COMA of the multiplexing switch U6 is connected with a fixed output 2V through a pull-up resistor, when a low level period is input to the input terminal PA1 of the operational amplifier, the D1 outputs 1.45V, and at this time, the voltage of the NO1B is 1.45V, as shown in fig. 10, at this time, the voltage signals of COMB and COMA are amplified by the signal amplifier U3 and output to the high-precision ADC U2 for sampling and converting into voltage digital quantity for the main control module 310 to read. Then, the U14 controls the pins a0 and a1 to be set to low level and high level respectively, that is, the channel two is selected, and at this time, the voltages of the output ports Da and Db of the U14 are the voltages between the voltages 2V and COMA, that is, the voltages at two ends of the pull-up resistor R10. At this time, the operational amplifier U9 amplifies the voltage signals from COMB and COMA and outputs them to the high-precision ADC U2 for sampling and converting them into voltage digital values for the main control module 310 to read. At this time, the sampling circuit acquires two voltages in total, namely the voltage at two ends of the second sampling resistor R31 and the voltage between the COMA and the COMB, namely the voltage between the NO1B and the NO2B, the COMB port forms a potential difference of 0.55V with the 1.45V level output by accessing the D1 port and the 2V voltage accessed by the second sampling resistor R31, and the potential difference is equivalent to the fact that the sampling resistor R10 and the equivalent resistors of the NO1B and the NO2B are accessed to a power supply loop with 0.55V output in a series mode. By the characteristic of equal current in the second series branch, the voltage across the second sampling resistor R31 divided by the resistance of the second sampling resistor R31 is equal to the voltage across the NO1B and NO2B divided by the resistance of the NO1B and NO2B, and the resistance between the NO1B and the NO2B is calculated through three known variables. The formula is as follows:
r (resistance to be measured) (V (voltage between COMA and COMB) × R31 (sampling resistance))/V (voltage across sampling resistance R31).
And the adjacent two resistors between the remaining steel anodes a2-A6, and the PT1000 temperature sensor, can select the channel connected with the following NO2B-NO7B by controlling the level values of pins a0, a1, a2 of U17 (selected according to the truth table of the chip), because the pins a0, a1, a2 of U16 and U17 share the same level through conducting wires, i.e. the channel U17 is selected the same as the channel U17, and the channels NO1 17-NO 8 17 of U17 connected with the signal input/output port J17 from channels 1-8 are staggered by one channel from the channels NO2 17-NO 7 17 connected with the channels 1-8 of U17, i.e. when U17 selects any one channel, the adjacent channels are respectively connected to the two ends of COMB and COMA, the voltage of the two adjacent input channels is the voltage of COMB, when COMB is selected channel 1, the channel corresponding to the channel NO1, the channel NO2 and the channel 17 is NO 17, when the channel 17 is NO 17, the channel 17 and the channel 17 is NO 17 and the channel 17 and NO 17, the resistance of every two channels can be measured by staggered connection of the channels, wherein the channel 4 is NO4B and NO5B, the channel 5 is NO5B and NO6B, the channel 6 is NO6B and NO7B, the channel 7 is NO7B and NO8B, and the channel 8 is NO8B and NO 8A.
According to a second aspect embodiment of the invention, the detection device comprises a concrete sensor driving detection circuit disclosed in any one of the above embodiments.
The detection equipment provided by the invention utilizes the drive detection circuit disclosed by any embodiment to carry out data acquisition on the concrete sensor, one equipment finishes various acquisition strategies, the detection efficiency is high, and the detection cost is reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A drive detection circuit for a concrete sensor, comprising: the signal giving module can be connected with the concrete sensor and can output a given signal;
the channel selection module comprises a plurality of acquisition ends, and each acquisition end can be correspondingly connected with each detection electrode of the concrete sensor;
the processing module is respectively connected with the signal giving module and the channel selection module, the processing module can control given signals output by the signal giving module, and the processing module can respectively control the acquisition end of the channel selection module to work and acquire the acquisition signals of the channel selection module to the concrete sensor.
2. The drive detection circuit of a concrete sensor according to claim 1, characterized in that: the processing module comprises a main control module and a signal conversion module, the main control module is respectively connected with the signal giving module and the channel selection module, the main control module can control given signals output by the signal giving module, the main control module can respectively control the collection end of the channel selection module to work, and the signal conversion module is respectively connected with the main control module and the channel selection module to input collected signals of the concrete sensor into the main control module.
3. The drive detection circuit of a concrete sensor according to claim 2, characterized in that: the signal conversion module comprises a signal amplification unit and an analog-to-digital conversion unit, and the channel selection module, the signal amplification unit, the analog-to-digital conversion unit and the master control module are sequentially connected.
4. The drive detection circuit of a concrete sensor according to claim 2, characterized in that: the channel selection module is an electrical property detection module, the electrical property detection module is connected with the signal conversion module, the plurality of acquisition ends are connected with the electrical property detection module, and the main control module is connected with the electrical property detection module to control the work of different acquisition ends to acquire the electrical property between different detection electrodes.
5. The drive detection circuit of a concrete sensor according to claim 4, characterized in that: the electrical property detection module comprises a first channel acquisition unit and a first channel switching unit, the output end of the first channel acquisition unit is connected with the signal conversion module, one pole of the detection end of the first channel acquisition unit is connected with one acquisition end of the first channel acquisition unit, the other pole of the detection end of the first channel acquisition unit is connected with the first channel switching unit, part of the acquisition end is connected with the first channel switching unit, the main control module is connected with the first channel switching unit to switch different acquisition ends on the first channel unit and the other pole of the detection end of the first channel acquisition unit to be communicated, and the first channel acquisition unit can detect the voltage between the two acquisition ends.
6. The drive detection circuit of a concrete sensor according to claim 5, characterized in that: the electrical property detection module further comprises a first switch unit and a first sampling resistor, the first switch unit and the first sampling resistor form a first series branch, the main control module is connected with the first switch unit to control the on-off of the first switch unit, one end of the first series branch is connected with one electrode of the detection end of the first channel acquisition unit, and the other end of the first series branch is connected with the conducted acquisition end through the first channel switching unit.
7. The drive detection circuit of a concrete sensor according to claim 6, characterized in that: the electrical property detection module also comprises a second channel acquisition unit, a second channel switching unit, a second sampling resistor and a second switch unit, wherein the second switch unit is respectively connected with one pole of the detection end of the first channel acquisition unit and one acquisition end thereof, the main control module is connected with the second switch unit to control the on-off of the second switch unit, the signal given module is respectively connected with the other pole of the detection end of the first channel acquisition unit and one pole of the detection end of the second channel acquisition unit, part of the acquisition ends are connected with the second channel switching unit, one end of the second sampling resistor is connected with the second channel switching unit, the main control module is connected with the second channel switching unit to switch the connection of different acquisition ends on the second channel switching unit and one end of the second sampling resistor, and a second series branch is formed between the second sampling resistor and the collection end communicated with the second channel switching unit and between the second sampling resistor and the collection end communicated with the first channel switching unit, and the signal given module is respectively connected with two ends of the second series branch.
8. The drive detection circuit for a concrete sensor according to claim 7, characterized in that: the collecting end is respectively provided with a plurality of anode collecting ends, a cathode collecting end and a reinforcing steel bar electrode collecting end, the cathode collecting end is connected with the second switch unit, the anode collecting ends are respectively connected with the first channel switching unit and the second channel switching unit, and the reinforcing steel bar electrode collecting end is connected with the first channel switching unit or the second channel switching unit.
9. The drive detection circuit for a concrete sensor according to claim 7, characterized in that: the signal given module comprises a signal modulation unit and a third switching unit, the signal modulation unit can output at least one constant-frequency pulse signal as a given signal, the signal modulation unit outputs a given signal for the second serial branch through the third switching unit, and the main control module is connected with the third switching unit to control the third switching unit to be switched on and switched off.
10. A test apparatus comprising a drive test circuit for a concrete sensor according to any one of claims 1 to 9.
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