CN211207143U - L oRa-based bridge monitoring strain sensor - Google Patents
L oRa-based bridge monitoring strain sensor Download PDFInfo
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- CN211207143U CN211207143U CN201922467051.6U CN201922467051U CN211207143U CN 211207143 U CN211207143 U CN 211207143U CN 201922467051 U CN201922467051 U CN 201922467051U CN 211207143 U CN211207143 U CN 211207143U
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Abstract
The utility model provides a bridge monitoring strain sensor based on L oRa communication transmission, including MCU microprocessor, L oRa module, power module, strain sensing circuit, filter circuit, AD converting circuit, real-time clock module, MCU microprocessor respectively with L oRa module, real-time clock, AD converting circuit connection, strain sensing circuit and filter circuit connection, filter circuit and AD converting circuit connection, power module supplies power for L oRa module, MCU microprocessor and strain sensing circuit respectively.
Description
The technical field is as follows:
the utility model belongs to the technical field of the electronic communication technique and specifically relates to a bridge monitoring sensor technique is related to.
Background art:
the basic connotation of bridge health monitoring is that the bridge structure condition is monitored and evaluated, an early warning signal is sent out when the bridge is in a special climate, traffic conditions or the bridge operation condition is abnormal and serious, and basis and guidance are provided for maintenance, repair and management decisions of the bridge. The sensor system is positioned at the most front end of the health detection system and is responsible for converting the load action and the physical quantity corresponding to the structure into light and electric signals which can be collected. The accuracy and reliability of bridge health monitoring are determined.
At present, the market of bridge structure detection sensors does not have a unified data standard, and different sensors correspond to different acquisition devices. And large-scale bridge needs the parameter of monitoring more, leads to the check point to be comparatively discrete, even in some extreme condition, and certain strain monitoring point's surrounding scope does not have other monitoring point. This situation poses significant difficulties for the implementation of bridge monitoring projects and makes it difficult to effectively control the cost of the project.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a bridge monitoring strain sensor based on L ora for overcoming the defect of above-mentioned current bridge monitoring data communication technique.
To achieve the above object, the present invention is realized by the following specific schemes:
a bridge monitoring strain sensor based on L oRa comprises an MCU microprocessor, a L oRa module, a power supply module, a strain sensing circuit, a filter circuit, an AD conversion circuit and a real-time clock module;
the MCU microprocessor is respectively connected with the L oRa module, the real-time clock and the AD conversion circuit;
the strain sensing circuit is connected with the filter circuit;
the filter circuit is connected with the AD conversion circuit;
and the power supply module supplies power to the L oRa module, the MCU microprocessor and the strain sensing circuit respectively.
The utility model discloses a further technique:
preferably, the power module is powered by a lithium ion storage battery, wherein the power module with low quiescent current outputs 3.3V to supply power to the MCU microprocessor, the L oRa module and the strain sensing circuit.
Preferably, the L oRa module adopts L oRa spread spectrum technology, and has two wake-up modes of external interrupt wake-up and periodic wake-up, and three modes of entering sleep mode of external interrupt, time setting and serial port instruction.
Preferably, the strain sensing circuit is a resistance-type strain sensing circuit, high-frequency interference signals are filtered by a filter after data are collected, and the signals are converted by an A/D conversion circuit.
The utility model has the advantages that:
a strain sensor for bridge detection passes through L oRa ad hoc network's mode to have solved the complicated, loaded down with trivial details, the big, the unchangeable shortcoming of later maintenance of signal teletransmission error of traditional wired mode wiring for the bridge detects based on L oRa.
Description of the drawings:
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts;
fig. 1 is a block diagram of the system structure of the present invention.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
As shown in fig. 1, the utility model provides a bridge monitoring strain sensor based on L oRa, including MCU microprocessor, L oRa module, power module, strain sensing circuit, filter circuit, AD converting circuit, real-time clock module;
the MCU microprocessor is respectively connected with the L oRa module, the real-time clock and the AD conversion circuit;
the strain sensing circuit is connected with the filter circuit;
the filter circuit is connected with the AD conversion circuit;
and the power supply module supplies power to the L oRa module, the MCU microprocessor and the strain sensing circuit respectively.
The utility model discloses select resistance-type sensing circuit that meets an emergency for use, when the atress in the monitoring process, the resistance of resistance foil gage will change, even become the electric bridge with the foil gage, and voltage signal is converted into to the data of meeting an emergency, and interference signal is got rid of to rethread filtering wave circuit, makes the data of output more accurate.
The A/D conversion circuit converts the analog voltage signal input by the filter circuit into a digital signal. The digital signal is then transmitted to the MCU microprocessor.
The MCU microprocessor selects MK L15Z 128V L H4 of the Feichka company, has the advantages of low power consumption, low cost, high performance and the like, has various working modes with different working currents, and can be switched according to actual use conditions, and the switching time is microsecond level.
The power module adopts a lithium ion storage battery for power supply, wherein the power module with low quiescent current outputs 3.3V to supply power for the MCU microprocessor, the L oRa module and the strain sensing circuit, wherein, the probe selects a separate power supply mode, thereby not only meeting the condition that the power supply voltage is inconsistent with other modules, but also ensuring the power supply stability of the probe, and ensuring the acquisition signal of the probe to be stable and reliable.
The L oRa module is a wireless serial port pass-through module based on an SX1278 radio frequency chip manufactured by SEMTECH company, the power output by a chip pin is +20dBm, after matching/filtering loss, the power on the antenna is +19dBm +/-0.5dB, the SX1278 belongs to a L oRa TM spread spectrum modulation technology, the long-distance advantage of the module benefits from modulation gain, and the radio frequency chip consumes more electric energy instead of increasing the transmitting power, wherein the current consumption of the radio frequency chip is that the sleep mode is less than 0.2uA, the idle mode is 1.6mA, the receiving mode is 12mA, the transmitting mode (maximum power) is 120mA., and the radio frequency chip has the characteristics of ultra-long transmission distance, strong anti-interference performance, high sensitivity, low transmitting power consumption, low static power consumption and the like, has two wake-up modes of external interrupt wake-up and periodic wake-up, and has three modes of external interrupt, time setting and serial port instruction entering sleep.
The strain sensing circuit adopts a resistance type strain sensing circuit, high-frequency interference signals are filtered out through a filter after data are collected, and the signals are converted through an A/D conversion circuit.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A bridge monitoring strain sensor based on L oRa is characterized by comprising an MCU microprocessor, a L oRa module, a power supply module, a strain sensing circuit, a filter circuit, an AD conversion circuit and a real-time clock module;
the MCU microprocessor is respectively connected with the L oRa module, the real-time clock and the AD conversion circuit;
the strain sensing circuit is connected with the filter circuit;
the filter circuit is connected with the AD conversion circuit;
and the power supply module supplies power to the L oRa module, the MCU microprocessor and the strain sensing circuit respectively.
2. The L oRa-based bridge monitoring strain sensor of claim 1, wherein the power module is powered by a lithium ion battery, wherein the power module with a low quiescent current outputs 3.3V to power the MCU microprocessor and L oRa module and the strain sensing circuit.
3. The L oRa-based bridge monitoring strain sensor of claim 1, wherein the L oRa module employs L oRa spread spectrum technology, has two wake-up modes of external interrupt wake-up and periodic wake-up, and has three modes of entering sleep mode of external interrupt, time setting and serial port command.
4. The L oRa-based bridge monitoring strain sensor of claim 1, wherein the strain sensing circuit is a resistance-type strain sensing circuit, and after data is collected, high-frequency interference signals are filtered out by a filter, and the signals are converted by an A/D conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922467051.6U CN211207143U (en) | 2019-12-31 | 2019-12-31 | L oRa-based bridge monitoring strain sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922467051.6U CN211207143U (en) | 2019-12-31 | 2019-12-31 | L oRa-based bridge monitoring strain sensor |
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| CN211207143U true CN211207143U (en) | 2020-08-07 |
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| CN201922467051.6U Active CN211207143U (en) | 2019-12-31 | 2019-12-31 | L oRa-based bridge monitoring strain sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116095131A (en) * | 2023-04-11 | 2023-05-09 | 四川三思德科技有限公司 | Reservoir safety monitoring method based on Internet of things |
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2019
- 2019-12-31 CN CN201922467051.6U patent/CN211207143U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116095131A (en) * | 2023-04-11 | 2023-05-09 | 四川三思德科技有限公司 | Reservoir safety monitoring method based on Internet of things |
| CN116095131B (en) * | 2023-04-11 | 2023-06-30 | 四川三思德科技有限公司 | Reservoir safety monitoring method based on Internet of things |
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