CN206670548U - A kind of channel wireless radio multi strain acquirement node for civil structure health monitoring - Google Patents
A kind of channel wireless radio multi strain acquirement node for civil structure health monitoring Download PDFInfo
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- CN206670548U CN206670548U CN201720291843.0U CN201720291843U CN206670548U CN 206670548 U CN206670548 U CN 206670548U CN 201720291843 U CN201720291843 U CN 201720291843U CN 206670548 U CN206670548 U CN 206670548U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 230000036541 health Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 230000003321 amplification Effects 0.000 abstract description 8
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 11
- 239000011888 foil Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000006854 communication Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a kind of channel wireless radio multi strain acquirement node for civil structure health monitoring, it includes straining bridge circuit, amplifying circuit, second-order filter circuit, A/D convertor circuit, WIFI wireless modules, clock circuit, electric power management circuit and MCU microprocessors, resistance strain gage is electrically connected with strain bridge circuit, for measure resistance strain gage be in strain bridge circuit in play full-bridge or half-bridge effect, again with second-order filter circuit, A/D convertor circuit is connected, MCU microprocessors receive the voltage signal after amplification filtering output, finally transmitted with WIFI wireless modules to monitoring platform.The utility model can detect the resistance strain gage of multiple passage difference resistances, monitoring more comprehensively it is whole really, it is its small volume, easy of integration, low in energy consumption, highly reliable.
Description
Technical field
The utility model belongs to structural health monitoring technology field, and in particular to a kind of for civil structure health monitoring
Channel wireless radio multi strain acquirement node.
Background technology
At present, monitor middle orbit on-line, arrange that strain transducer is large number of in bridge structure, the stress size layouted is each
Differ and change acutely, be also required to neatly to adjust amplification attenuation parameter while accelerating and adopted with adapting to multi-signal
Collection.Resistance strain gage weak output signals, the problems such as causing measurement result inaccuracy is easily disturbed in measurement process.Foil gauge should
Power measurement is to realize that data processing, data communicate by artificial long-term acquisition system, storage display and associated control etc.
Function is simultaneously stored in database.This kind of mode is severe in working environment, and the too high occasion of technology may be to applying band in engineering
Carry out inconvenience, limit the application of existing strain measurement module.
In addition, the change of long cable line impedance in transmission theory is influenceed and changed by frequency signal amplitude, for multiple
The engineering in heterocycle border, which is laid, has certain problem, and wiring is cumbersome, complicated, and later maintenance takes considerable time, cost.
Now propose to utilize more accurate automatic zero set strain signal wireless acquisition node, the equipment has long-term stabilization can
By property, strong antijamming capability, the features such as acquisition interface is simple, so extensively using measuring in bridge, Geotechnical Engineering.
Therefore, it is a kind of that there is reliable and stable, strong antijamming capability, the simple wireless strain signal acquisition node of acquisition interface
Urgently propose, the high adverse circumstances monitoring point of the technical requirements such as bridge, tunnel, side slope can be widely used in.
Utility model content
The purpose of this utility model is to provide a kind of channel wireless radio multi strain acquirement for civil structure health monitoring
Node, to solve the problems mentioned in the above background technology.The strain acquirement node can access the foil gauge of different resistances, monitoring
More comprehensively accurate, compatible good, small volume, easily arrangement are easy to assemble, and low in energy consumption, reliability is high.
To achieve the above object, the utility model provides following technical scheme：It is a kind of for civil structure health monitoring
Channel wireless radio multi strain acquirement node, including electric power management circuit, strain bridge circuit, MCU microprocessors, clock circuit,
WiFi wireless modules, resistance strain gage and MCU microprocessors, the electric signal of three output ends output of the electric power management circuit
The electric signal inputted respectively with the input of 3V3 voltage-stabilized power supplies, MCU microprocessors and WiFi wireless modules is connected, and the 3V3 is steady
Piezoelectricity source output terminal is electrically connected with by the input of wire and strain bridge circuit, and the output end of the strain bridge circuit is led to
The input for crossing amplifying circuit and second-order filter circuit is electrically connected with, and the second-order filter circuit passes through A/D convertor circuit and MCU
The input of microprocessor is electrically connected with, and the input of the WiFi wireless modules electrically connects with the output end of MCU microprocessors
Connecing, the signal output part of the MCU microprocessors is connected by the master system signal of WiFi wireless modules and monitoring platform,
Its WiFi wireless module uses the wireless WIFI network set up based on C/S model, and its carrier wave frequency range band is roomy, radiofrequency signal and number
It is high according to transmission rate, it can realize that transparent transmission transmits, the output end of the clock circuit electrically connects with the input of MCU microprocessors
Connect, the output end and the input of strain bridge circuit of the resistance strain gage are electrically connected with, and its strain bridge circuit is used to carry
For reliable and stable input voltage, bridge-type change-over circuit is used to provide the circuit that full-bridge, half-bridge or the resistance of temperature compensation change into voltage,
120 ohm, 350 ohm and 1000 ohm of foil gauge can be monitored.
Preferably, the MCU microprocessors use MSP430F5438 process chips.
Preferably, the second-order filter circuit is second-order low-pass filter circuit.
Preferably, the electric power management circuit is OP2177 dual power supplies, and electric power management circuit is steady using just negative three end
Depressor realization ± 12V to ± 5V transformation and 5V to 3.3V transformation, to be powered to the circuit of different power voltage, are carried
The stability of high circuit voltage, to be powered to the circuit of different power voltage, improve the stability of circuit voltage；
OP2177 dual power supplies can obtain high-gain, high cmrr, low noise and cascaded transmission function stability, the double electricity of OP2177
The high-operational amplifier of source power supply, form active second-order low-pass filter circuit with resistance capacitance and have enlarging function concurrently.
The utility model be in for measuring strain piece in bridge circuit play full-bridge or half-bridge effect, then with second-order filter
Circuit, A/D convertor circuit are connected, and MCU microprocessors receive the voltage signal after amplification filtering output, finally with the wireless moulds of WiFi
Block is transmitted to monitoring platform, and MCU microprocessors use MSP430F5438 process chips；Its clock circuit, WiFi wireless modules
The collection of data, conversion, transmission and reception, reliability height are realized with A/D convertor circuit.Strain the differential mode of bridge-type circuit output
Strain signal very little, it is core, its input and strain by high precision operating amplifier AD620 probably in mV levels, amplifying circuit
Bridge circuit connects, and for preposition amplification and noise is effectively suppressed, output end is connected with second-order low-pass filter, passes through electricity
Foil gauge choosing is hindered, for producing hundred times or thousand times of compliance voltage signal.
Technique effect of the present utility model and advantage：The utility model solves tradition using the wireless means of communication of WIFI
The shortcomings of wired mode wiring is complicated, wiring is cumbersome, signal long-distance transmissions error is big, later maintenance is constant, while this practicality
It is new to can detect the foil gauge of different resistances, therefore be adapted in long term monitoring or detection can access not using the strain acquirement node
With the foil gauge of resistance, monitoring is more comprehensively accurate, compatible good, small volume, easily arrangement, easy to assemble, and low in energy consumption, reliability is high.
Brief description of the drawings
Fig. 1 is the utility model integrated circuit figure；
Fig. 2 is amplification circuit diagram in the utility model；
Fig. 3 is AD converter circuit figure in the utility model；
Fig. 4 is electric power management circuit figure in the utility model；
Fig. 5 is WIFI wireless modules circuit diagram in the utility model；
Fig. 6 is MCU microprocessors and clocking scheme in the utility model.
In figure：1 electric power management circuit, 2 3V3 voltage-stabilized power supplies, 3 strain bridge circuits, 4 amplifying circuits, 5 second-order filters electricity
Road, 6 A/D convertor circuits, 7 MCU microprocessors, 8 clock circuits, 9 WiFi wireless modules, 10 resistance strain gages.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
The utility model provides a kind of channel wireless radio multi strain for civil structure health monitoring as shown in Figure 1 and adopted
Collect node, including electric power management circuit 1, strain bridge circuit 3, MCU microprocessors 7, clock circuit 8, WiFi wireless modules 9,
Resistance strain gage 10 and MCU microprocessors 7, the electric power management circuit 1 three output ends output electric signal respectively with 3V3
The electric signal that voltage-stabilized power supply 2, MCU microprocessors 7 input with the input of WiFi wireless modules 9 connects, the 3V3 voltage-stabilized power supplies
2 output ends are electrically connected with by the input of wire and strain bridge circuit 3, and the output end of the strain bridge circuit 3 passes through
The input of amplifying circuit 4 and second-order filter circuit 5 is electrically connected with, the second-order filter circuit 5 by A/D convertor circuit 6 with
The input of MCU microprocessors 7 is electrically connected with, the input of the WiFi wireless modules 9 and the output end of MCU microprocessors 7
It is electrically connected with, the signal output part of the MCU microprocessors 7 passes through WiFi wireless modules 9 and the master system of monitoring platform
Signal connects, and for its WiFi wireless module 9 using the wireless WIFI network set up based on C/S model, its carrier wave frequency range band is roomy, penetrates
Frequency signal and message transmission rate are high, can realize that transparent transmission transmits, and the output end of the clock circuit 8 is defeated with MCU microprocessors 7
Enter end to be electrically connected with, the output end and the input of strain bridge circuit 3 of the resistance strain gage 10 are electrically connected with, its electrostrictive strain
Bridge circuit is used to provide reliable and stable input voltage, and bridge-type change-over circuit is used to provide full-bridge, half-bridge or the resistance of temperature compensation turn
Into the circuit of voltage, 120 ohm, 350 ohm and 1000 ohm of foil gauge can be monitored.
As shown in Fig. 2 due to the weak output signal that resistance strain gage 10 exports, LM1117 voltage-stabilized power supply circuits are needed to stabilize it
3V3 again, strain bridge circuit 3 use two panels foil gauge, active gage with compensating plate is in 90 ° pastes, be connected to adjacent bridge arm, there is temperature
Compensation function is spent, potentiometer returns to zero for electric bridge on bridge arm；Its amplifying circuit 4 is formed using the operational amplifier of high-precision AD 620
Differential amplifier circuit, effectively remove common mode disturbances, the letter that the external Ω of precision resistance 499 and 49.9 Ω respectively export strain bridge
Number amplification 100 times and 1000 times；Filter circuit 5 forms active second order using High-precision O P2177 operational amplifiers and resistance capacitance
LPF, low-pass cut-off frequencies 160Hz is set according to the strain signal of collection, fully meets the filter function of design.
As shown in figure 3, A/D convertor circuit 6 does the AD conversion of 16 using ADS1248 chips, using bus-organization with it is micro-
Processor 7 connects, and does 8 tunnels with MAX4051 and select, the strain signal on the tunnel of simultaneous transmission 8.
As shown in figure 4, electric power management circuit 1 is first designed using DC-DC Switching Power Supplies, lithium battery is boosted into ± 15V, then
Formed using linear three terminal regulator LM7812, LM7912 and LM4040A50, LM4040A25, realization ± 15V's to ± 12V turns
Become and ± 12V to ± 5V, ± 12V are to ± 2V5 transformation, to meet the needs of different circuits are to supply voltage, ensure power supply electricity
Pressure is continual and steady.
As shown in figure 5, WiFI wireless modules 9 realize transparent transmission transmission communication using XLW-210A modules.Wireless WIFI sensings
Device network system communication process is that PC control node works, and host computer is sent to node by WIFI routing devices and controlled
Order, node start data acquisition after receiving control command, are then sent back to the data collected by WIFI routing devices
Host computer, finally the data of collection are analyzed by host computer conversion process.
As shown in fig. 6, MCU microprocessors 7 use MSP430F5438 process chips, the frequency of clock circuit 8 is 16MHz, is led to
Cross and programming and burning are carried out to chip, control the collection and processing of whole strain signal.
The course of work：Resistance strain gage 10 first returns to zero before collection to electric bridge, increases big resistance on bridge arm
Variable potentiometer, select different electric bridge modes, there is 1/4 bridge, 1/2 bridge, a full-bridge, primary signal voltage leads in uV~mV ranks
Cross differential amplifier circuit and effectively solve common-mode voltage interference and noise reduction influence, while optimize output impedance so that primary signal energy
It is enough to be completely exaggerated exactly.
The output signal of amplification is realized into second-order low-pass filter, cancellation of DC offset and low frequency by second-order filter circuit 5
The interference of rate noise.Electric bridge is carried out not by MCU microprocessors 7 to MCU microprocessors 7 by the conversion output of A/D convertor circuit 6 again
Comparative analysis is balanced, software change is carried out to amplification zeroing bias voltage, the current potential of output is readjusted to zero-bit, at this moment
MCU microprocessors 7 can change flag bit and indicate that zeroing terminates.Transmitted after the processing of MCU microprocessors 7 to WiFi wireless modules 9
Strain signal is communicated wirelessly, transmitted by router to monitoring platform.
Wireless strain signal acquisition node controls by embedded technology and microprocessor, is fundamentally peeling off to artificial
The dependence of conditioning, the convenience and real-time of signal condition when largely improving strain testing.And utilize the micro- places of MCU
The program reusability of reason device, which can be adjusted easily, gathers the multiplication factor needed during differently strained signal and wave filter
Cut-off frequency, wide range, the wireless signal conditioning of high-adaptability and acquisition tasks can be realized, be a kind of more novel than more efficient
Solution.
Finally it should be noted that：Preferred embodiment of the present utility model is the foregoing is only, is not limited to this
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it can still modify to the technical scheme described in foregoing embodiments, or to which part technical characteristic
Progress equivalent substitution, all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements made etc.,
It should be included within the scope of protection of the utility model.
Claims (4)
1. a kind of channel wireless radio multi strain acquirement node for civil structure health monitoring, including electric power management circuit (1), should
Become bridge circuit (3), MCU microprocessors (7), clock circuit (8), WiFi wireless modules (9), resistance strain gage (10) and MCU
Microprocessor (7), it is characterised in that：The electric signal of three output ends output of the electric power management circuit (1) is steady with 3V3 respectively
The electric signal that voltage source (2), MCU microprocessors (7) input with the input of WiFi wireless modules (9) connects, the 3V3 voltage stabilizings
Power supply (2) output end is electrically connected with by the input of wire and strain bridge circuit (3), the strain bridge circuit (3)
Output end is electrically connected with by the input of amplifying circuit (4) and second-order filter circuit (5), and the second-order filter circuit (5) is logical
The input for crossing A/D convertor circuit (6) and MCU microprocessors (7) is electrically connected with, the input of the WiFi wireless modules (9) with
The output end of MCU microprocessors (7) is electrically connected with, and the signal output part of the MCU microprocessors (7) passes through WiFi wireless modules
(9) it is connected with the master system signal of monitoring platform, the output end of the clock circuit (8) is defeated with MCU microprocessors (7)
Enter end to be electrically connected with, the output end of the resistance strain gage (10) is electrically connected with the input of strain bridge circuit (3).
2. a kind of channel wireless radio multi strain acquirement node for civil structure health monitoring according to claim 1, its
It is characterised by：The MCU microprocessors (7) use MSP430F5438 process chips.
3. a kind of channel wireless radio multi strain acquirement node for civil structure health monitoring according to claim 1, its
It is characterised by：The second-order filter circuit (5) is second-order low-pass filter circuit.
4. a kind of channel wireless radio multi strain acquirement node for civil structure health monitoring according to claim 1, its
It is characterised by：The electric power management circuit (1) is OP2177 dual power supplies, and the voltage of the electric power management circuit (1) uses can be with
Realization ± 12V to ± 5V transformation and the low pressure difference linear voltage regulator chip of 5V to 3.3V transformation.
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| CN201720291843.0U CN206670548U (en) | 2017-03-24 | 2017-03-24 | A kind of channel wireless radio multi strain acquirement node for civil structure health monitoring |
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| CN201720291843.0U CN206670548U (en) | 2017-03-24 | 2017-03-24 | A kind of channel wireless radio multi strain acquirement node for civil structure health monitoring |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108917587A (en) * | 2018-05-17 | 2018-11-30 | 大连理工大学 | A kind of resistance-strain type curvature sensor based on favour stone full-bridge principle |
| CN109186909A (en) * | 2018-09-26 | 2019-01-11 | 天津城建大学 | A kind of pseudo static testing device data collection system based on WiFi technology |
| CN109410546A (en) * | 2018-09-13 | 2019-03-01 | 东南大学 | NB-IoT wireless sensor and method for sensing for secular strain monitoring |
| CN109708565A (en) * | 2019-02-14 | 2019-05-03 | 北京市劳动保护科学研究所 | A kind of monitoring device and system of truss structure |
| CN110031137A (en) * | 2019-03-15 | 2019-07-19 | 广西电网有限责任公司桂林供电局 | A kind of spring touch finger is comprehensive to compress force checking device |
| CN114508995A (en) * | 2022-01-20 | 2022-05-17 | 中国航空工业集团公司北京长城计量测试技术研究所 | Step response characteristic calibration device and method of resistance strain measuring instrument |
-
2017
- 2017-03-24 CN CN201720291843.0U patent/CN206670548U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108917587A (en) * | 2018-05-17 | 2018-11-30 | 大连理工大学 | A kind of resistance-strain type curvature sensor based on favour stone full-bridge principle |
| CN109410546A (en) * | 2018-09-13 | 2019-03-01 | 东南大学 | NB-IoT wireless sensor and method for sensing for secular strain monitoring |
| CN109186909A (en) * | 2018-09-26 | 2019-01-11 | 天津城建大学 | A kind of pseudo static testing device data collection system based on WiFi technology |
| CN109708565A (en) * | 2019-02-14 | 2019-05-03 | 北京市劳动保护科学研究所 | A kind of monitoring device and system of truss structure |
| CN110031137A (en) * | 2019-03-15 | 2019-07-19 | 广西电网有限责任公司桂林供电局 | A kind of spring touch finger is comprehensive to compress force checking device |
| CN114508995A (en) * | 2022-01-20 | 2022-05-17 | 中国航空工业集团公司北京长城计量测试技术研究所 | Step response characteristic calibration device and method of resistance strain measuring instrument |
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Granted publication date: 20171124 |