CN102620644A - Zigbee-based micro strain measurement unattended engineering monitoring system - Google Patents
Zigbee-based micro strain measurement unattended engineering monitoring system Download PDFInfo
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Abstract
The invention discloses a Zigbee-based micro strain measurement unattended engineering monitoring system. The Zigbee-based micro strain measurement unattended engineering monitoring system comprises an integrated displacement sensor, a reduced function device (RFD) module and a coordinator, wherein the integrated displacement sensor is embedded into concrete and comprises a fixed amplitude RC oscillating circuit, a linear variable differential transformer (LVDT) displacement sensor, a phase sensitive detection and signal amplifying circuit and a microprocessor which are connected sequentially; the RFD module is connected with the integrated displacement sensor, is arranged on the ground and comprises a second Zigbee chip and a direct current/direct current (DC/DC) converter; the coordinator is connected with the RFD module and comprises a display screen, a keyboard, and a first Zigbee chip and a general packet radio service (GPRS) module which are connected with the display screen and the keyboard respectively; and the second Zigbee chip is in wireless communication with the first Zigbee chip. The Zigbee-based micro strain measurement unattended engineering monitoring system can realize site-remote end unattended monitoring function.
Description
Technical field
The present invention relates to a kind of engineering monitoring system, relate in particular to a kind of microstrain and measure unmanned type engineering monitoring system based on Zigbee.
Background technology
ZigBee is based on a low-power consumption territory fidonetFido of IEEE802.15.4 standard, be well known day by day, but its maximum characteristic is exactly the low-power consumption networking, but particularly has the networking function of route.Zigbee be one by reaching the wireless data sending network platform that 65000 wireless data transmission modules are formed; The CDMA net or the GSM net of the similar existing mobile communication of ten minutes; A node of the similar mobile communication of each Zigbee digital transmission module; In whole network range, can intercom mutually between them; Communication distance between each network node can expand to hundreds of rice from 75 meters of standard, or several kilometers; Whole Zigbee network can also be connected with existing other diverse network.For example, can realize remote monitoring through internet or GPRS (general packet radio service) to the Zigbee Control Network.Zigbee and mobile radio communication are essentially different; The Zigbee network mainly is to be the transmission that realizes data in the automatic control system and mutual; And mobile radio communication is to realize that the mutual of voice, image information serves as basic; And each mobile node set up cost very expensive (generally all more than 1,000,000 yuans), by contrast, the expense of setting up a Zigbee " node " is 1000 yuans of less thaies often.Each global function Zigbee network node (FFD) not only itself can be undertaken the function of monitored object, and for example sensor is realized wireless connections completion data acquisition and monitoring, automatically the data of other network nodes transmission of transfer; In addition, each Zigbee network node can be in signal cover itself and a plurality of local function Zigbee node (RFD) of not bearing network information transfer task realize wireless connections.Each Zigbee network node can be supported 31 sensors and controlled plant, and each sensor can have 8 kinds of different interface modes with controlled plant, comprises the collection and the transmission of digital quantity and analog quantity.
In fact, present building field, also technology before continuing to use many decades and mode are obtained all kinds of data necessary mostly.Usually, the building ground environment is abominable, and all kinds of carrier vehicles, personnel are numerous and diverse, for the measurement mechanism that obtains necessary data is often destroyed, almost at each building-site generation are arranged all as the impaired phenomenon of the transmission cable of information carrier; And measurement data mostly relies on the mode of artificial sight's reading to obtain, and the accuracy of gained data depends critically upon the technical merit of survey crew, and consistance is very poor with repeatability.Therefore, unmanned engineering monitoring system of structure is necessary.
The traditional approach of counter stress, microdisplacement measurement is realized through adopting a kind of steel chord type strain gauge that is called in the building field at present.Its principle is: when on the string wire that two ends are tightened, imposing the excitation electric pulse, this string wire produces exciting; Suppose that this string wire is fixed in a certain rigid body cavity; Do the time spent deformation will take place when this rigid body receives external force, the deformation of rigid body will cause the distance between two fixed endpoints of built-in string wire that subtle change takes place, when string wire receives the electric pulse excitation; Exciting will take place in string wire; Corresponding variation also takes place in its oscillation frequency, through contrasting current mensuration frequency and last time measuring frequency, converses strain value according to experimental formula.From the principle of summary, can clearly find out that the steel chord type strain gauge has following irremediable defective:
1) because the two ends of string wire are tight, receive the tension force effect all the time, so nature deformation can take place in string wire, thereby cause the variation of its output natural frequency;
2) consistance of steel chord type taseometer output signal is relatively poor, and the level of tightness of its output response and string wire, the consistance of string wire material are relevant, so each sensor needs independent correction;
3) the steel chord type signal of sensor has tangible temperature drift characteristic;
4) the steel chord type sensor needs an external pumping signal with certain power energy usually, therefore can't transmit pumping signal with wireless mode;
5) when the pile foundation strain measurement, need tested reinforcing bar is blocked, the steel chord type sensor is welded between two fractures of reinforcing bar, and therefore when pile foundation load, if the elastic modulus and the tested reinforcing bar of steel chord type sensor are inconsistent, then measured value is not had a meaning of guiding construction;
6) measured value need pass through empirical parameter and carries out second Conversion, and precision is relatively poor, does not have comparability and consistance.
Can know from above-mentioned analysis, in stress, microdisplacement measurement, use the improper structure unmanned of steel chord type sensor type monitoring network, and its measured value often be unable to undergo to weigh.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and provide a kind of microstrain based on Zigbee to measure unmanned type engineering monitoring system; Monitoring system so that LVDT (linear variable difference transformer) displacement transducer, Zigbee on-site wireless LAN switching GPRS constitute is carried out the microstrain measurement, can realize the unattended surveillance of scene-far-end and the stochastic sampling function of field monitoring data.
The technical scheme that realizes above-mentioned purpose is:
Unmanned type engineering monitoring system is measured in a kind of microstrain based on Zigbee; Comprise the integrated displacement transducer of fixing and being embedded in reinforcing bar in the concrete; And the RFD module that is connected and is arranged at ground through cable with integrated displacement transducer; And with the telegon of RFD module wireless connections, wherein:
Said telegon comprises display screen and keyboard, and the Zigbee chip and the GPRS module that are connected respectively with display screen and keyboard;
Said RFD module comprises interconnective the 2nd Zigbee chip and DC/DC transducer, said the 2nd a Zigbee chip and a Zigbee chip radio communication;
Said integrated displacement transducer comprises fixed ampllitude RC oscillatory circuit, LVDT displacement transducer, phase sensitive detection and signal amplification circuit and the microprocessor that connects successively;
Said the 2nd Zigbee chip is during at Preset Time or in the instruction of receiving said telegon; Give said integrated displacement transducer power supply through controlling said DC/DC transducer, energising back said fixed ampllitude RC oscillatory circuit output sinusoidal signal is to encourage the primary coil of said LVDT displacement transducer; The measuring-signal of said LVDT displacement transducer output is sent to said microprocessor after amplifying through said phase sensitive detection and signal amplification circuit; It is signal digitalized that this microprocessor will receive; And the measurement data that obtains sent to said the 2nd Zigbee chip; The 2nd Zigbee chip is transmitted to said telegon with the measurement data that receives, and this telegon is gone out the measurement data wireless transmission through said GPRS module again.
Unmanned type engineering monitoring system is measured in the above-mentioned microstrain based on Zigbee; Wherein, Said phase sensitive detection and signal amplification circuit also have the function of phase sensitive detection; Be used to differentiate the phase place of the output signal of said LVDT displacement transducer, said phase sensitive detection and signal amplification circuit comprise comparer IC2A, comparer IC2B, in-phase amplifier IC3, inverting amplifier IC4, resistance R 23, resistance R 27 and electric capacity E4, wherein:
The in-phase end of comparer IC2A receives sinusoidal signal OSC through resistance R 14, end of oppisite phase ground connection, and output terminal connects the end of forbidding of inverting amplifier IC4;
The end of oppisite phase of comparer IC2B receives sinusoidal signal OSC through resistance R 17, in-phase end ground connection, and output terminal connects the end of forbidding of in-phase amplifier IC3;
The in-phase input end of in-phase amplifier IC3 is through the output signal SIG of resistance R 20 reception LVDT displacement transducers 12, and inverting input is through resistance R 21 ground connection, and inverting input connects its output terminals through resistance R 22;
The same inverting input of inverting amplifier IC4 is through the output signal SIG of resistance R 25 reception LVDT displacement transducers 12, and in-phase input end is through resistance R 24 ground connection, and inverting input connects its output terminals through resistance R 26;
The output terminal of in-phase amplifier IC3 is connected the output terminal of inverting amplifier IC4 with resistance R 27 through the resistance R 23 of series connection;
The end of electric capacity E4 connects the end that joins of resistance R 23 and resistance R 27, other end ground connection.
Unmanned type engineering monitoring system is measured in the above-mentioned microstrain based on Zigbee, and wherein, the in-phase end of comparer IC2A is through voltage stabilizing diode W3 ground connection; The end of oppisite phase of comparer IC2B is through voltage stabilizing diode W4 ground connection.
Unmanned type engineering monitoring system is measured in the above-mentioned microstrain based on Zigbee, and wherein, the end of forbidding of in-phase amplifier IC3 connects power supply and passes through resistance R 19 ground connection through resistance R 18; The end of forbidding of inverting amplifier IC4 connects power supply and passes through resistance R 16 ground connection through resistance R 15.
Unmanned type engineering monitoring system is measured in the above-mentioned microstrain based on Zigbee, and wherein, said integrated displacement transducer is connected through the quad line with the RFD module.
Unmanned type engineering monitoring system is measured in above-mentioned microstrain based on Zigbee, and wherein, the measurement data that said microprocessor obtains after with digitizing sends to said the 2nd Zigbee chip through RS 232 modes.
Unmanned type engineering monitoring system is measured in the above-mentioned microstrain based on Zigbee, wherein, said GPRS module and remote terminal wireless telecommunications, the coding work instruction at receiving remote terminal, and to remote terminal transmission measurement data.
The invention has the beneficial effects as follows: the monitoring system that the present invention constitutes with LVDT displacement transducer, Zigbee on-site wireless LAN switching GPRS is carried out microstrain and is measured; Can realize the unattended surveillance of scene-far-end and the stochastic sampling function of field monitoring data, have extremely significantly advantage and advance:
1) precision is high, has got rid of the otherness of manual measurement;
2) use is fashionable in the measurement of pile foundation field, need not block tested reinforcing bar;
3) sensor casing accessory is irrelevant because of deformation and measured value that external force causes;
4) receive temperature drift effects hardly;
5) credibility of measurement data, the transparency good (can't change measurement data);
6) realize the far-end unmanned, need not buy engineering surveying instrument;
7) realize the field monitoring data at any time, stochastic sampling;
8) can realize unified monitoring in enterprise or the industry, can effectively get rid of human factor, improve construction quality;
9) LVDT displacement transducer and its treatment circuit integrated design, promptly treatment circuit is built in the housing of LVDT displacement transducer, and is filled to reach the purpose of waterproof by silica gel fully;
10) the output signal of integrated displacement transducer is connected the completion of RFD module with power supply by a quad, by the power supply of RFD module controls to integrated displacement transducer;
11) phase sensitive detection and the signal amplification circuit of original creation have the phase sensitive detection function, and have characteristics such as simple, good processing accuracy.
Description of drawings
Fig. 1 is the structural representation that unmanned type engineering monitoring system is measured in the microstrain based on Zigbee of the present invention;
Fig. 2 is the particular circuit configurations figure of telegon in one embodiment of the invention;
Fig. 3 is the particular circuit configurations figure of RFD module in one embodiment of the invention;
Fig. 4 is the circuit diagram of the treatment circuit of integrated displacement transducer in one embodiment of the invention;
Fig. 5 is the circuit diagram of the treatment circuit of integrated displacement transducer in the another embodiment of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1; Unmanned type engineering monitoring system is measured in a kind of microstrain based on Zigbee of the present invention; Comprise the integrated displacement transducer 1 of fixing and being embedded in reinforcing bar in the concrete; And be connected and be arranged at the RFD module 2 on ground through quad line and integrated displacement transducer 1, and with the telegon 3 of RFD module 2 wireless connections, wherein:
Telegon 3 comprises display screen 31 and keyboard 32, and a Zigbee chip 33 and a GPRS module 34 that is connected respectively with display screen 31 and keyboard 32; Wherein, GPRS module 34 and the communication of remote terminal (not shown), display screen 31 is the serial LCDs;
Remote terminal is through GPRS network control system telegon 3; Promptly send coding work and instruct to telegon 3, telegon 3 sends instruction and gives RFD module 2 according to the coding work instruction of receiving; The 2nd Zigbee chip 21 is at Preset Time or when receiving the instruction of telegon 3; Send control signal and give DC/DC transducer 22, thereby give integrated displacement transducer 1 power supply, all supply power promptly for the each several part of integrated displacement transducer 1 through control DC/DC transducer 22; After the energising, fixed ampllitude RC oscillatory circuit 11 output sinusoidal signals make LVDT displacement transducer 12 work with the primary coil of excitation LVDT displacement transducer 12; The measuring-signal of LVDT displacement transducer 12 outputs is sent to microprocessor 14 after amplifying through phase sensitive detection and signal amplification circuit 13; It is signal digitalized that microprocessor 14 will receive; And the measurement data that obtains sent to the 2nd Zigbee chip 21 with the RS232 mode; The 2nd Zigbee chip 21 is transmitted to telegon 3 with the measurement data that receives through the Zigbee chip 33 with its wireless telecommunications; Telegon 3 is gone out the measurement data wireless transmission through GPRS module 34 again, is transferred to any remote terminal, thereby realizes the unmanned engineering monitoring.
Among the present invention, the concrete structure of phase sensitive detection and signal amplification circuit 13 is fixing, can be simple signal amplifier, is used to amplify the output signal of LVDT displacement transducer 12, and it is less and require the occasion of general measure precision generally to be used to measure range; Also can be that the present invention creates, except the function of amplifying signal, also have the function of phase sensitive detection, be used to differentiate the phase place of the output signal of LVDT displacement transducer 12, generally be used for the wide range occasion of bidirectional measurement.
In fact; In the pile foundation microstrain is measured; Integrated displacement transducer 1 is fixed on the reinforcing bar, and by concrete casting, each pile foundation has several integrated displacement transducers 1 of being numbered; RFD module 2 is perhaps given each integrated displacement transducer 1 power supply by the preset respectively time of each numbering by give certain integrated displacement transducer 1 power supply of specifying numbering from the instruction of telegon 3.
See also Fig. 2, be the particular circuit configurations figure of telegon in one embodiment of the invention 3, wherein, it is the Zigbee chip of CC2530 that a Zigbee chip 33 is selected model for use, and the model that GPRS module 34 is selected for use is the GPRS module of SIM900A.Among Fig. 2, chip IC 1 (SIM900A) is joined through DSPDAT, DSPCLK, DSPCS and four pins of DSPD/C and display screen 31.
See also Fig. 3, be the particular circuit configurations figure of RFD module 2 in one embodiment of the invention, wherein, it is the Zigbee chip of CC2530 that the 2nd Zigbee chip 21 is selected model for use; DC/DC transducer 22 is made up of transistor BG1, single-chip switching power supply IC2 (LM2577), resistance R 4, capacitor C 12, transformer T2, diode D1 and diode D2 etc.Among Fig. 3, the P1 mouth of chip IC 1 (CC2530) receives the signal that microprocessor 14 sends through RS232, therefore, can handle 8 integrated displacement transducers 1; In other words, in the pile foundation monitoring, every pile is allowed to handle 8 measurands.Chip IC 1 (CC2530) is with P0-0 mouth driving transistors BG1; When the instruction of receiving telegon 3 or arrived Preset Time, the P0-0 mouth output low level of chip IC 1 (CC2530), transistor BG1 ends; The oscillatory circuit of single-chip switching power supply IC2 (LM2577); The circuit that to be resistance R 4 form with capacitor C 12 is started working, and integrated displacement transducer 1 provides ± and 5 couchers make power supply; Because 8051 kernels of the built-in succinct instruction of CC2530, and the port function of this chip is all able to programme, so 8 pins of P1 mouth all are set to the receiving function port among the present invention.After time-delay 2 seconds, chip IC 1 (CC2530) beginning is regularly read the sensor signal of P1 mouth successively, and will read signal through wireless mode one by one and send to telegon 3.Otherwise when transistor BG1 conducting was saturated, the capacitor C 12 of the oscillation circuit of single-chip switching power supply IC2 (LM2577) was shorted to zero level, so single-chip switching power supply IC2 (LM2577) is in the failure of oscillation state, and the power supply of integrated displacement transducer 1 is cut off.
See also Fig. 4; Circuit diagram for the treatment circuit of integrated displacement transducer 1 in one embodiment of the invention; It is less and require the occasion of general measure precision that this circuit is used to measure range, satisfy fully need not when journey is measured in a small amount the judgment signal output phase (with former limit relatively) problem; Normally used phase sensitive detection mode in the time of promptly can not adopting the LVDT signal Processing.Among Fig. 4, it is the single-chip microcomputer of STC5404AD that microprocessor 14 is selected model for use; Fixed ampllitude RC oscillatory circuit 11A is made up of integrated operational amplifier IC1A, some resistance, some electric capacity and two diodes; Phase sensitive detection and signal amplification circuit 13A are made up of integrated operational amplifier IC1C, integrated operational amplifier IC1D, some resistance, two diodes and an electric capacity.Among Fig. 4, the sine wave of integrated operational amplifier IC1A output amplifies the sinusoidal signal that the back forms 3 volts (effective values) through operational amplifier IC1B, this signal through electric capacity E2 after directly, in order to encourage the primary coil of LVDT displacement transducer 12.The output signal of LVDT displacement transducer 12 is integrated operational amplifier IC1C and implements full-wave rectification, and after integrated operational amplifier IC1D carries out 7.5 times of amplifications, is fed to the P11 AD1 conversion port of single-chip microcomputer IC2 (STC5404AD).Simultaneously, energising back single-chip microcomputer IC2 (STC5404AD) started working, through 2 seconds time-delay post-sampling AD ports; The purpose of implementing time-delay in 2 seconds is wait for oscillator output signal stable.Signal after single-chip microcomputer IC2 (STC5404AD) digitized processing is delivered to RFD module 2 with the RS232 mode.Reference source IC 3 (MCP1541) among Fig. 4 provides 4.096 volts voltage reference for the AD conversion.By this circuit can calculating sensor measurement sensitivity: the sensitivity of supposing LVDT displacement transducer 12 is volt. millimeter/91 millivolts; And it is linear good; That is: under 1 volt of sinusoidal effective value signal excitation, displacement takes place 1 millimeter when changing, the output response is 91 millivolts (effective values); Therefore, under the excitation of 3 volts (effective values), during 1 millimeter of change in displacement, the output response is 273 millivolts (effective values); To export 0.273 millivolt signal when in other words, 1 micron variation takes place in displacement.This signal is through full-wave rectification, and after integrated operational amplifier IC1D carries out 7.5 times of amplifications, forms 2.048 millivolts signal.The mechanical variable dynamic range of supposing LVDT displacement transducer 12 is 2 millimeters, and then spiking output is 2.048 a millivolts * 2000=4.096 volt.Known single-chip microcomputer IC2 (STC5404AD) is 10 AD precision; Therefore under the condition of 4.096 volts of reference sources; The magnitude of voltage of corresponding each quantization unit is 4.096 millivolts, when this value is equal to LVDT displacement transducer 12 just 2 microns variations take place, the output signal value that after 7.5 times of processing and amplifying, obtains; In theory, adopting Fig. 4 circuit is 2 microns to the process errors of amounting to of LVDT displacement transducer 12 measuring-signals.
See also Fig. 5, be the circuit diagram of the treatment circuit of integrated displacement transducer 1 in the another embodiment of the present invention, this circuit is used for the wide range occasion of bidirectional measurement, differentiates two tasks to accomplish amplitude measurement and direction.Among Fig. 5, it is the Zigbee chip of CC2530 that microprocessor 14 is selected model for use, diode D1, D2 be used for+5 couchers as power supply be depressured to+3.6 volts, supply CC2530 to use; Fixed ampllitude RC oscillatory circuit 11B is made up of integrated operational amplifier IC1A, some resistance, some electric capacity and two diodes; Among Fig. 5, the sine wave of integrated operational amplifier IC1A output amplifies the sinusoidal signal OSC that the back forms 3 volts (effective values) through operational amplifier IC1B, this signal through electric capacity E2 after directly, in order to encourage the primary coil of LVDT displacement transducer 12.The output signal SIG of LVDT displacement transducer 12 delivers to chip IC 7 (CC2530) through phase sensitive detection and signal amplification circuit 13B, and the signal after chip IC 7 (CC2530) digitized processing is delivered to RFD module 2 with the RS232 mode.Phase sensitive detection in the present embodiment and signal amplification circuit 13B have the phase sensitive detection function for the present invention's original creation, comprising: comparer IC2A, comparer IC2B, in-phase amplifier IC3, inverting amplifier IC4, resistance R 23, resistance R 27 and electric capacity E4, wherein:
The in-phase end of comparer IC2A receives sinusoidal signal OSC through resistance R 14, end of oppisite phase ground connection, and output terminal connects the end of forbidding of inverting amplifier IC4; The end of oppisite phase of comparer IC2B receives sinusoidal signal OSC through resistance R 17, in-phase end ground connection, and output terminal connects the end of forbidding of in-phase amplifier IC3;
The in-phase input end of in-phase amplifier IC3 is through the output signal SIG of resistance R 20 reception LVDT displacement transducers 12, and inverting input is through resistance R 21 ground connection, and inverting input connects its output terminals through resistance R 22;
The same inverting input of inverting amplifier IC4 is through the output signal SIG of resistance R 25 reception LVDT displacement transducers 12, and in-phase input end is through resistance R 24 ground connection, and inverting input connects its output terminals through resistance R 26;
The output terminal of in-phase amplifier IC3 is connected the output terminal of inverting amplifier IC4 with resistance R 27 through the resistance R 23 of series connection; The end of electric capacity E4 connects the end that joins of resistance R 23 and resistance R 27, other end ground connection; Resistance R 23, resistance R 27 constitute the output smoothing network of in-phase amplifier IC3 and inverting amplifier IC4 respectively with electric capacity E4, get about 3 times time constant of sinusoidal signal OSC cycle;
The in-phase end of comparer IC2A is through voltage stabilizing diode W3 ground connection; The end of oppisite phase of comparer IC2B is through voltage stabilizing diode W4 ground connection;
The end of forbidding of in-phase amplifier IC3 connects power supply and passes through resistance R 19 ground connection through resistance R 18; The end of forbidding of inverting amplifier IC4 connects power supply and passes through resistance R 16 ground connection through resistance R 15; Power supply is 5V.
In-phase amplifier IC3 and inverting amplifier IC4 all are that model is the operational amplifier of OPA221; The model that comparer IC2A and comparer IC2B select for use is LM339.
The principle of phase sensitive detection in the present embodiment and signal amplification circuit 13B: if the output signal SIG and the sinusoidal signal OSC homophase (for just) of LVDT displacement transducer 12; Upper half at sinusoidal signal OSC; Comparer IC2A output DIS2 is a high level, and comparer IC2B output DIS1 is a low level, therefore; Inverting amplifier IC4 output is under an embargo; In-phase amplifier IC3 output is enabled, since input signal and the sinusoidal signal OSC homophase of in-phase amplifier IC3 and inverting amplifier IC4, sinusoidal wave first wave envelope of in-phase amplifier IC3 output cathode property; When sinusoidal signal OSC zero passage got into lower half, comparer IC2A output DIS2 was a low level, and comparer IC2B output DIS1 is a high level; Therefore; Inverting amplifier IC4 output is enabled, and in-phase amplifier IC3 output is under an embargo, the sinusoidal wave envelope of inverting amplifier IC4 output cathode property lower half; The output of synthetic in-phase amplifier IC3 and inverting amplifier IC4 obtains the positive polarity sine wave envelope of similar full-wave rectification.
If output signal SIG and sinusoidal signal OSC anti-phase.Upper half at sinusoidal signal OSC; Comparer IC2A output DIS2 is a high level, and comparer IC2B output DIS1 is a low level, therefore; Inverting amplifier IC4 output is under an embargo; In-phase amplifier IC3 output is enabled, since input signal and the sinusoidal signal OSC anti-phase of in-phase amplifier IC3 and inverting amplifier IC4, the sinusoidal wave half-wave envelope of in-phase amplifier IC3 output negative pole property; When sinusoidal signal OSC zero passage got into lower half, comparer IC2A output DIS2 was a low level, and comparer IC2B output DIS1 is a high level; Therefore; Inverting amplifier IC4 output is enabled, and in-phase amplifier IC3 output is under an embargo, the sinusoidal wave envelope of inverting amplifier IC4 output negative pole property lower half; The output of synthetic in-phase amplifier IC3 and inverting amplifier IC4 obtains the negative polarity sine wave envelope of similar full-wave rectification.
In sum, the present invention carries out the microstrain measurement with the monitoring system that LVDT displacement transducer, Zigbee on-site wireless LAN switching GPRS constitute, and can realize the unattended surveillance of scene-far-end and the stochastic sampling function of field monitoring data.And the phase sensitive detection with phase sensitive detection function of the present invention's original creation and signal amplification circuit are extremely simple, volume is little and processing accuracy is good; Overcome traditional phase-sensitive detection circuit and adopted the diode with nonlinear effect, integrated analog switch or have the change-over switch of the FET of certain tube voltage drop when opening, therefore had the drawback that influences operational amplifier signal Processing precision as control operational amplifier input end with certain output impedance.
Above embodiment only supplies to explain the present invention's usefulness; But not limitation of the present invention; The technician in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (7)
1. unmanned type engineering monitoring system is measured in the microstrain based on Zigbee; It is characterized in that; Comprise the integrated displacement transducer of fixing and being embedded in reinforcing bar in the concrete; And be connected and be arranged at the RFD module on ground with integrated displacement transducer through cable, and with the telegon of RFD module wireless connections, wherein:
Said telegon comprises display screen and keyboard, and the Zigbee chip and the GPRS module that are connected respectively with display screen and keyboard;
Said RFD module comprises interconnective the 2nd Zigbee chip and DC/DC transducer, said the 2nd a Zigbee chip and a Zigbee chip radio communication;
Said integrated displacement transducer comprises fixed ampllitude RC oscillatory circuit, LVDT displacement transducer, phase sensitive detection and signal amplification circuit and the microprocessor that connects successively;
Said the 2nd Zigbee chip is during at Preset Time or in the instruction of receiving said telegon; Give said integrated displacement transducer power supply through controlling said DC/DC transducer, energising back said fixed ampllitude RC oscillatory circuit output sinusoidal signal is to encourage the primary coil of said LVDT displacement transducer; The measuring-signal of said LVDT displacement transducer output is sent to said microprocessor after amplifying through said phase sensitive detection and signal amplification circuit; It is signal digitalized that this microprocessor will receive; And the measurement data that obtains sent to said the 2nd Zigbee chip; The 2nd Zigbee chip is transmitted to said telegon with the measurement data that receives, and this telegon is gone out the measurement data wireless transmission through said GPRS module again.
2. unmanned type engineering monitoring system is measured in the microstrain based on Zigbee according to claim 1; It is characterized in that; Said phase sensitive detection and signal amplification circuit also have the function of phase sensitive detection; Be used to differentiate the phase place of the output signal of said LVDT displacement transducer, said phase sensitive detection and signal amplification circuit comprise comparer IC2A, comparer IC2B, in-phase amplifier IC3, inverting amplifier IC4, resistance R 23, resistance R 27 and electric capacity E4, wherein:
The in-phase end of comparer IC2A receives sinusoidal signal OSC through resistance R 14, end of oppisite phase ground connection, and output terminal connects the end of forbidding of inverting amplifier IC4;
The end of oppisite phase of comparer IC2B receives sinusoidal signal OSC through resistance R 17, in-phase end ground connection, and output terminal connects the end of forbidding of in-phase amplifier IC3;
The in-phase input end of in-phase amplifier IC3 is through the output signal SIG of resistance R 20 reception LVDT displacement transducers 12, and inverting input is through resistance R 21 ground connection, and inverting input connects its output terminals through resistance R 22;
The same inverting input of inverting amplifier IC4 is through the output signal SIG of resistance R 25 reception LVDT displacement transducers 12, and in-phase input end is through resistance R 24 ground connection, and inverting input connects its output terminals through resistance R 26;
The output terminal of in-phase amplifier IC3 is connected the output terminal of inverting amplifier IC4 with resistance R 27 through the resistance R 23 of series connection;
The end of electric capacity E4 connects the end that joins of resistance R 23 and resistance R 27, other end ground connection.
3. unmanned type engineering monitoring system is measured in the microstrain based on Zigbee according to claim 2, it is characterized in that the in-phase end of comparer IC2A is through voltage stabilizing diode W3 ground connection; The end of oppisite phase of comparer IC2B is through voltage stabilizing diode W4 ground connection.
4. unmanned type engineering monitoring system is measured in the microstrain based on Zigbee according to claim 2, it is characterized in that, the end of forbidding of in-phase amplifier IC3 connects power supply and passes through resistance R 19 ground connection through resistance R 18; The end of forbidding of inverting amplifier IC4 connects power supply and passes through resistance R 16 ground connection through resistance R 15.
5. unmanned type engineering monitoring system is measured in the microstrain based on Zigbee according to claim 1, it is characterized in that said integrated displacement transducer is connected through the quad line with the RFD module.
6. unmanned type engineering monitoring system is measured in the microstrain based on Zigbee according to claim 1, it is characterized in that, the measurement data that said microprocessor obtains after with digitizing sends to said the 2nd Zigbee chip through the RS232 mode.
7. unmanned type engineering monitoring system is measured in the microstrain based on Zigbee according to claim 1; It is characterized in that; Said GPRS module and remote terminal wireless telecommunications, the coding work instruction at receiving remote terminal, and to remote terminal transmission measurement data.
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