CN104155041B - A kind of wireless and passive prestress detection system - Google Patents
A kind of wireless and passive prestress detection system Download PDFInfo
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- CN104155041B CN104155041B CN201410364235.9A CN201410364235A CN104155041B CN 104155041 B CN104155041 B CN 104155041B CN 201410364235 A CN201410364235 A CN 201410364235A CN 104155041 B CN104155041 B CN 104155041B
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Abstract
The invention belongs to prestress detection technical field, be specially a kind of wireless and passive prestress detection system.It adopts wireless and passive pre-stress sensor, is positioned over the collection in concrete, cable wire being carried out to adaptability to changes.In order to protect sensor, double-deck epoxy resin is adopted sensor and cable wire to be encased.External data acquisition and processing equipment is middle distance rf readers and panel computer respectively.Panel computer, by wireless data transfer services and system database server communication, calculates actual prestress numerical value and returns to server.Use this system, long-term or regular detection can be carried out, to prevent the generation of security incident to the cable prestressing in building.
Description
Technical field
The invention belongs to prestress detection technical field, be specifically related to the detection system of cable prestressing in a kind of concrete.
Background technology
In building structure health detects, pre-stress sensor has a wide range of applications.Their discontinuity or the prestress change of continuous print to inside configuration are monitored, and provide first hand prestress information to maintainer, in order to prevent the generation of security incident.Current building prestress detection system, general adopts wired mode, by sensor together with data circuit, power circuit in Transducers Embedded in Concrete.This mode is for affecting to building structure itself, and the deployment of sensor is also convenient not.Existing detection system mostly is separate unit, lacks unified management and the standardization of heat transfer agent.
Summary of the invention
Use wired, active deficiency to overcome pre existing stress sensing system, set up a set of unitized, standardized information management mode, the invention provides a set of wireless and passive prestress detection system.
Wireless and passive prestress detection system provided by the invention, wireless and passive pre-stress sensor is adopted in concrete, use middle distance rf readers the prestressed, reinforced information in concrete to be read out in outside, use panel computer to process data, and utilize the wireless data transmission function of panel computer to be sent to system server.Particularly, whole system is made up of wireless and passive pre-stress sensor, middle distance rf readers, panel computer, system server four parts.Wherein:
Described wireless and passive pre-stress sensor, is made up of sensor chip and transmitting coil, and sensor chip adopts double-deck epoxy resin to protect, and transmitting coil is placed on outside double-deck epoxy resin protective seam.Wireless and passive pre-stress sensor self is with energy acceptance module, data acquisition module and data transmission module, under the protection of epoxy resin, build into concrete with cable wire, have easy for installation, do not affect building integral structure, the feature that service time is long; Wherein, the low frequency radio frequency signal that described energy acceptance module sends for receiving middle distance rf readers, described data acquisition module is used for the analog voltage from strain circuit to be converted into digital voltage value, data transmission module, for the digital voltage value collected is modulated to low frequency radio frequency signal, returns to external data collecting device.
Described middle distance rf readers realizes the wireless dual-use function providing energy and receive data, and data are transferred to panel computer process.Middle distance rf readers is primarily of D-type power amplifier, radio-frequency module, wave detector, single-chip microcomputer, RS232 interface composition.D-type power amplifier is responsible for producing low frequency radio frequency signal, radio-frequency module is responsible for transmission and the acceptance of low frequency radio frequency signal, the low frequency signal that wave detector is responsible for loading data message carries out demodulation, single-chip microcomputer processes the information that demodulation obtains, and RS232 interface is responsible for the connection of this middle distance rf readers and panel computer.Middle distance rf readers is by portable power source energy supply, and low induction reactance major diameter Ritz coil increases transmission range in addition.
Panel computer is equipped with prestress data processing and software for display, and utilizes wireless data transfer services and database server to carry out telecommunication, returns to server prestress information.
System server is provided with database software, the storage of primary responsibility prestress information, and carries out the mutual of data message with panel computer.
In present system, middle distance rf readers utilizes D-type power amplifier, produces low frequency radio frequency signal, utilizes radio-frequency module to be transmitted to wireless and passive pre-stress sensor, as energy source; Simultaneously, wireless and passive pre-stress sensor by the Data Modulation collected on this low frequency radio frequency signal, middle distance rf readers carries out demodulation by wave detector to signal, and decoded by single-chip microcomputer, obtain the particular number of this sensor and the primary voltage information corresponding to prestress of its acquisition; Single-chip microcomputer passes to panel computer the relevant information extracted by data conversion line; Panel computer calls relevant driver, receive the data message from single-chip microcomputer, and the numbering of this sensor utilized wireless data transmission function to pass to the system server of access internet, and request with number that corresponding voltage---(production error causes the transformation standard of each sensor to have error for prestress conversion formula and coefficient, need specific transformation ratio), after obtaining transformation ratio, calculate actual prestress, show concrete numerical value at display interface, and raw data and actual prestress value are returned to server stores; System server access internet, stores the information of each sensor, the reading information of sensor and prestress transformation ratio, is responsible for the corresponding request from client, comprise and obtain design factor request and prestress information inquiring request.
The invention has the beneficial effects as follows: adopt wireless and passive pre-stress sensor, wireless mode makes the installation complexity of system reduce, and is chronically exposed to outside, extends the serviceable life of system without the need to wire; Adopt low frequency signal as the signal of transmission, have good penetrability for concrete, when sacrificing certain data rate, add transmission range, comparatively the communication mode such as bluetooth, ZIGBEE has greater advantage under concrete medium; Adopt the data management structure of CS, make the unitarity of system and managerial enhancing; To each sensor label and carry out appearance calibration, by calibration coefficient store in the server, extract during use, personal settings carried out to each sensor, improves measuring accuracy.
Accompanying drawing explanation
Fig. 1 is general frame figure of the present invention.
Fig. 2 is native system running schematic diagram.
Fig. 3 is radio frequency middle distance reader module schematic diagram.
Fig. 4 is wireless sourceless sensor scheme of installation.Wherein a forward sectional view, b is lateral cross-sectional view.
Number in the figure: 1 cable wire, 2 wireless sourceless sensors, 3 precast concretes, 4 low induction reactance major diameter Ritz coils, 5 radio frequency middle distance readers, 6 panel computers, 7 database servers, 8 portable power sources, 9 double-deck epoxy resin, 10 circuit layers, 11 coil layer, 12 coils, 13 sensor chips.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
In Fig. 2, wireless and passive pre-stress sensor (2) is fit in precast concrete (3) with cable wire (1), cable wire is after prefabricated component two ends are tightened up, the strain part of pre-stress sensor senses corresponding prestress, but when outside does not have data acquisition equipment, whole sensor does not have energy, does not carry out work.When external data collecting device near time (current designed distance can reach 35cm), for sensor wireless provides work capacity.Portable power source (8) is radio frequency middle distance reader (5) power supply, signal is transmitted to wireless and passive pre-stress sensor (2) by low induction reactance major diameter Ritz coil (4), wireless and passive pre-stress sensor (2) obtains energy, and the strain on cable wire (1) is converted into digital voltage signal, read the numbering of self simultaneously, by the mode of load-modulate, digital voltage signal and the numbering of self are uploaded in radiofrequency signal, and pass to data acquisition equipment, radio frequency middle distance reader demodulating and decoding signal, obtain numbering and the information of voltage of sensor, and pass to panel computer (6).Panel computer (6) utilizes wireless data transfer services, access internet, and is connected to the database server (7) of internet.The numbering of each wireless sourceless sensor (2) is stored, corresponding calibration coefficient and history strain data in database server (7).Calibration coefficient from wireless sourceless sensor (2) calibration test when dispatching from the factory, and record corresponding voltage and turn prestressed calibration coefficient.After panel computer (6) obtains corresponding calibration coefficient, calculate the prestress in this region, display interface shows result, and result is returned to database server (7).
Fig. 3 is radio frequency middle distance reader (5) each module diagram.The radio frequency low frequency signal being loaded with data message enters radio-frequency module from low induction reactance major diameter Ritz coil (4), radio-frequency module passes to wave detector, demodulate data information transfer to single-chip microcomputer, single-chip microcomputer is responsible for decoding, is separated frame extraction useful information, passes to next stage equipment by serial ports; On the other hand, single-chip microcomputer produces low frequency signal ripple, passes to D class amplifirer, carries out power amplification, then passes to radio-frequency module transmitting.
Fig. 4 is wireless sourceless sensor scheme of installation.Wherein, cable wire (1) is surrounded by one section of double-deck epoxy resin (9), and internal layer is circuit layer (10), and place sensor chip (13), skin is coil layer (11), placement be the transmitting coil (12) of sensor.
Claims (1)
1. a wireless and passive prestress detection system, wireless and passive pre-stress sensor is adopted in concrete, use middle distance rf readers the prestressed, reinforced information in concrete to be read out in outside, use panel computer to process data, and utilize the wireless data transmission function of panel computer to be sent to system server; Whole system is made up of wireless and passive pre-stress sensor, middle distance rf readers, panel computer, system server four parts; It is characterized in that:
Described wireless and passive pre-stress sensor is made up of sensor chip and transmitting coil, and sensor chip adopts double-deck epoxy resin to protect, and transmitting coil is placed on outside double-deck epoxy resin protective seam; Wireless and passive pre-stress sensor self, with energy acceptance module, data acquisition module and data transmission module, under the protection of epoxy resin, is built into concrete with cable wire; Wherein, the low frequency radio frequency signal that described energy acceptance module sends for receiving middle distance rf readers, described data acquisition module is used for the analog voltage from strain circuit to be converted into digital voltage value, data transmission module, for the digital voltage value collected is modulated to low frequency radio frequency signal, returns to external data collecting device;
Described middle distance reader realizes the wireless double function providing energy and receive data, and data are transferred to panel computer process; Middle distance rf readers is primarily of D-type power amplifier, radio-frequency module, wave detector, single-chip microcomputer, RS232 interface composition; D-type power amplifier is responsible for producing low frequency radio frequency signal, radio-frequency module is responsible for transmission and the acceptance of low frequency radio frequency signal, the low frequency signal that wave detector is responsible for loading data message carries out demodulation, single-chip microcomputer processes the information that demodulation obtains, and RS232 interface is responsible for the connection of this middle distance rf readers and panel computer; Middle distance rf readers is by portable power source energy supply;
Described panel computer is equipped with prestress data processing and software for display, and utilizes wireless data transfer services and database server to carry out telecommunication, returns to server prestress information;
Described system server is provided with database software, the storage of primary responsibility prestress information, and carries out the mutual of data message with panel computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410364235.9A CN104155041B (en) | 2014-07-28 | 2014-07-28 | A kind of wireless and passive prestress detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410364235.9A CN104155041B (en) | 2014-07-28 | 2014-07-28 | A kind of wireless and passive prestress detection system |
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| Publication Number | Publication Date |
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| CN104155041A CN104155041A (en) | 2014-11-19 |
| CN104155041B true CN104155041B (en) | 2016-03-30 |
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| CN201410364235.9A Expired - Fee Related CN104155041B (en) | 2014-07-28 | 2014-07-28 | A kind of wireless and passive prestress detection system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614103B (en) * | 2014-12-26 | 2017-10-10 | 复旦大学 | A kind of wireless and passive pre-stress sensor |
| CN106017568B (en) * | 2016-07-06 | 2018-12-25 | 沈阳建筑大学 | The structural healthy monitoring system and integrated approach of prefabricated assembled concrete system |
| CN110319879A (en) * | 2019-06-19 | 2019-10-11 | 青岛理工大学 | A kind of safety characteristics intelligent monitoring technology for building life cycle management |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6430459B1 (en) * | 1999-06-04 | 2002-08-06 | Sw Paper Inc. | Nip pressure sensing system |
| CN202255702U (en) * | 2011-07-16 | 2012-05-30 | 中国电子科技集团公司第五十二研究所 | Handheld steel supporting stress monitoring system |
| CN103308216A (en) * | 2013-06-03 | 2013-09-18 | 徐州牛头山铸业有限公司 | Cast iron pressure stress detecting system |
| CN203672525U (en) * | 2013-12-20 | 2014-06-25 | 中南大学 | Concrete stress sensor using piezoelectric characteristic of PVDF film |
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Granted publication date: 20160330 Termination date: 20170728 |