CN106323156A - Frequency-hopping spread-spectrum communication-based bridge circuit-adjustable wireless strain sensing device - Google Patents

Frequency-hopping spread-spectrum communication-based bridge circuit-adjustable wireless strain sensing device Download PDF

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Publication number
CN106323156A
CN106323156A CN201610637626.2A CN201610637626A CN106323156A CN 106323156 A CN106323156 A CN 106323156A CN 201610637626 A CN201610637626 A CN 201610637626A CN 106323156 A CN106323156 A CN 106323156A
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China
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wireless
strain
data
bridge
circuit
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CN106323156B (en
Inventor
宋建成
宋鑫
许春雨
田慕琴
李新胜
宋单阳
张润冬
陈惠英
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
    • G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping

Abstract

The invention relates to a frequency-hopping spread-spectrum communication-based bridge circuit-adjustable wireless strain sensing device. The frequency-hopping spread-spectrum communication-based bridge circuit-adjustable wireless strain sensing device is composed of a lithium battery output voltage conversion and voltage stabilizing circuit, a plurality of bridge circuit gating circuits, a signal conditioning circuit, a CPU chip and peripheral circuit and a wireless transmitting module circuit; the frequency-hopping spread-spectrum communication-based bridge circuit-adjustable wireless strain sensing device is used for detecting the strain data of a force bearing object. The invention also provides a communication method which is a bridge circuit-adjustable wireless frequency-hopping spread-spectrum communication method and is applied to wireless strain receiving and transmitting modules; and the communication method is used for realizing the detection of the strain of the force bearing object. With the device and the communication method of the invention adopted, the gating and measurement of a plurality of kinds of strain electric bridge circuits can be realized, and the reliability and flexibility of the wireless communication of strain data can be improved, and the attenuation of wireless transmission signals is small, and the diffraction ability of the wireless transmission signals is strong.

Description

A kind of bridge adjustable wireless strain sensing device based on FHSS communication
Technical field
The present invention relates to a kind of application resistance strain plate realize strain information detection device, especially one and utilize wireless The bridge adjustable wireless strain sensing device of FHSS communication and FHSS communication means thereof.
Background technology
Along with Germany's " industry 4.0 " and the proposition in succession of " made in China 2025 " strategy, to the many machinery in manufacturing industry The security reliability of equipment proposes requirements at the higher level.As iron tower of power transmission line, hydraulic support, large-sized gantry hang, Large Fe cable bridge Concern production, the people's livelihood matter of fundamental importance etc. infrastructure, carry out its state permanently effective reliably monitoring and processing potential safety hazard Investigation seems most important.Foil gauge is mainly attached at parts surface to be detected by existing monitoring for plant equipment, Then being connected to deformeter by lead-in wire, foil gauge constitutes strain bridge with its internal circuit, according to the resistance-strain of foil gauge Effect measures the STRESS VARIATION of test point.
In a practical situation, various facilities and equipments are carried out strain monitoring, and there are the following problems, due to parts to be detected Stress mornitoring point substantial amounts, accesses deformeter by the way of lead-in wire, needs to carry out the wiring work of complexity；Different strains Test occasion, it is desirable to strain sensitivity different, deformeter need to for no strain testing occasion arrange complexity electricity Road is mated, and complex operation is complicated；Being limited by the sampling channel quantity of deformeter, strain detecting point can greatly reduce.Cause This needs to develop a kind of convenient, flexible device and seek a kind of transmission method reliably test point is carried out strain detecting.
Prior art, " a kind of multichannel microstrain data collecting system wireless interaction unit " patent of invention, disclose A kind of multichannel microstrain data collecting system wireless interaction unit of detection field, it is positioned at multichannel microstrain data acquisition On each monitoring point of collecting system, including analog switching ic, ZigBee communication module, RS232 communication module, for GPRS The DTU module of telecommunication and microprocessor.The communication of this wireless interaction unit has two kinds, and both modes are passed through Analog switching ic switches over.One carries out near radio networking by ZigBee communication module and realizes data friendship It is mutually, another kind of that to carry out teledata with remote sensing station by the way of RS232 and DTU module are with GPRS mutual.But these are many Passage microstrain data collecting system, is not related to strain acquirement circuit, realizes answering only by introducing communication Being wirelessly transferred of parameter evidence, is not described in detail in the reliability being wirelessly transferred.
Prior art " microstrain detector wireless transport module " patent of invention, disclose a kind of microstrain detector without Line transport module, including microstrain detector and receiver module, microstrain detector and receiver module are using bluetooth as wireless Transmission signal vector, the data order of transmission of receiver module Auto-matching difference sensing unit.But the wireless biography described in this invention Defeated module does not describe the Acquisition Circuit of its strain in detail and the data under Bluetooth wireless transmission is obstructed state are transmitted extensive Reactivation power.
Prior art " metal structure Intelligent Dynamic telemetering of strain device " patent of invention, discloses a kind of metal structure intelligence Dynamic telemetering of strain device, it includes multiple strain gauges and wireless strain acquisition node, the wireless ginseng being arranged on crane Number acquisition node and distance host.This invention uses TDC technology to realize the collection of strain signal, wireless strain acquisition node and nothing Line parameter acquisition node and distance host are that the GPRS/DTU module by being built in radio node realizes the wireless biography of data Defeated, make use of GPRS public network hardware.But the metal structure Intelligent Dynamic telemetering of strain device described in this invention uses TDC technology Detection strains, and detection sensitivity is fixed, and strain detecting usage range more limits to, and data are wirelessly transferred and are limited by GPRS public affairs Net hardware facility.
Prior art " a kind of strain acquirement Circuits System and strain acquirement method " patent of invention, discloses a kind of strain and adopts Collector system and strain acquirement method.This system includes that constant-current source circuit, bridge configure circuit, hardware leveling circuit, amplification Modulate circuit and AD Acquisition Circuit.The main innovation point of this patent is effective zero bias correcting method of its hardware leveling and bridge The motility of match circuit.Although this invention has the flexible feature of bridge coupling, but novelty is also limited to strain and adopts In the design of collector, the effective ways that a kind of strain data externally transmits are not proposed.
In above-mentioned prior art, wireless strain sensing device is using motility and is being wirelessly transferred in reliability and still suffers from one Fixed weak point.Accordingly, it would be desirable to develop a kind of wireless strain that strain detecting circuit is the most adjustable, radio communication is reliable and stable Sensing device, is allowed to mate different types of foil gauge, it is adaptable to the strain detecting occasion of different sensitivity, and The radio remote Distance Transmission of strain data can be realized with a kind of reliable wireless transmission method.
Summary of the invention
It is an object of the invention to for above-mentioned the deficiencies in the prior art, it is provided that a kind of bridge based on FHSS communication can Mode wireless strain sensing device, the wireless strain testing circuit needed for solving for different strain sensitivity detection occasions Matching problem.Meanwhile, use the communication mode of wireless FHSS, on the one hand, add communication bandwidth, improve it anti-interference Ability and anti-fading, multi-path jamming ability, can make it be applied to various complex environment；On the other hand, according to wireless communication carriers The feature monitored, sets up communication handshake mechanism, arranges special wireless data frame, improves the reliability of radio communication and stablizes Property, reduce the power consumption of wireless transmitter module.
It is an object of the invention to be reached by following measure.
A kind of bridge adjustable wireless strain sensing device based on FHSS communication, turns including lithium battery output voltage Change and mu balanced circuit, multiple bridge gating circuit, signal conditioning circuit, cpu chip and peripheral circuit, wireless transmitter module electricity Road；It is characterized in that: by the conversion of described lithium battery output voltage and mu balanced circuit, multiple bridge gating circuit, signal condition electricity Road, cpu chip and peripheral circuit and radio emitting modular circuit are integrated in one, and the bridge constituting FHSS communication is adjustable Wireless strain sensing device, is used for detecting stress thing strain data；
The conversion of described lithium battery output voltage and mu balanced circuit each modular circuit in described wireless strain sensing device Power supply；
Described multiple bridge gating circuit is the selection of electric bridge bridge needed for differently strained measurement occasion and bridge zero is waftd school Adjust；
Described signal conditioning circuit is that the faint strain signal for detecting amplifies, filters and follow process；
Described cpu chip and peripheral circuit are to export the AD conversion of analogue signal, data advanced processes for signal conditioning circuit And and wireless transmitter module between communication connection；
Described radio emitting modular circuit is the wireless-modulated for strain data and transmitting, realizes wireless with wireless receiving module FHSS communicates.
Further, the additional technical feature of said apparatus is as follows.
Described lithium battery output voltage is 12V, and the voltage that this voltage is constituted through voltage conversion chip BA033T and BA05T turns Change circuit, be respectively converted into 3.3V and 5V, and voltage stabilizing output, power to each functional module.
Described multiple bridge gating circuit, realizes including half-bridge wheatstone bridge, half-bridge by selecting two toggle switch Double bridge and the gating of full-bridge, the strain measurement occasion required for different sensitivity.
Described cpu chip is SOC(system on a chip) level chip C8051F020, and the process core of wireless transmitter module is Norway The wireless data sending chip nRF905 of DORNIC company；The two carries out data transmission the reading with control command by SPI communication mode Write, complete conversion and the transmission of strain data.
Above-mentioned a kind of bridge adjustable wireless strain sensing device based on FHSS communication, FHSS communication means Being to be applied to communication means between wireless strain transceiver module, described communication means is as follows:
Described wireless strain transceiver module is to be constituted hardware supported with C8051F020 and nRf905 radio transmitting and receiving chip, wireless should Become between transceiver module based on carrier sense multiple access/collision avoids CSMA/CA agreement, uses DATA/ACK to shake hands for twice machine System carries out radio communication, and wireless communication data frame includes strain data frame DATA and data acknowledgement frame ACK；
Described strain data frame and data acknowledgement frame form are characterised by:
DATA: destination address+source address+66H+data+timed+ index_ch；
ACK: destination address+source address+77H+timef+ index_ch；
Wherein, timedRepresent that wireless receiving module receives the process time of DATA frame, timefRepresent and estimate the waiting time, i.e. send out Sending module to enter the length of one's sleep of sending mode next time after receiving ACK, index_ch represents communication channel call number；
Described radio transmitting and receiving chip nRF905 works in 433MHz frequency range, uses 4 channels to communicate, respectively initial channel 427MHz(0) and alternate channel 431MHz(1), 435MHz(2), 439MHz(3), wherein 0,1,2,3 be respectively channel indexes number, Radio receiving transmitting module all works in initial channel 0 after powering on, and then carries out channel hopping at communication failure or when being interfered.
Further, the additional technical feature of said method is as follows.
The process of described radio communication be wireless transmitter module when initial channel 0 listens to channel idle, first to wireless Receiver module sends strain data frame DATA, and wireless transmitter module starts Preset Time timing, simultaneously enters reception state；Wireless Reception data, after initial channel 0 detects homogenous frequency signal, are carried out CRC check by receiver module, extract and deposit after verification is correct Strain data data in storage DATA frame, then starts to turn and jumps timing, send data validation frame ACK to wireless transmit mould simultaneously Block；If wireless transmitter module is in preset time t imepInside receiving ACK frame, Preset Time timing stops and resetting, now root According to ACK estimates waiting time timefEntering sleep state, the waiting time to rear oneself wakes up entrance transmission state up；If Wireless transmitter module is in preset time t imepInside it is not received by ACK frame, then retransmits a DATA frame, if at timepIn Do not receive ACK frame yet, then turn according to the rule of channel 0-3-1-2-0 and jump in alternate channel；And wireless receiving module turns in wait Jumping time timejAfter do not receive DATA frame yet, also turn according to the rule of channel 0-3-1-2-0 and jump in alternate channel, repeat afterwards Above-mentioned communication process.
Described timep> 2×timed , timej=2×timep+ timed , timep< timef < timej。
Realize a kind of based on FHSS communication the bridge adjustable wireless strain sensing dress that the invention described above is provided Put, compared with prior art, present invention achieves the strain detecting bridge of half-bridge wheatstone bridge, half-bridge double bridge, full-bridge Switching, is adapted to the strain detecting requirement of different sensitivity, simplifies strain detecting circuit, reduce hardware circuit flexibly Volume, reduces power consumption；The communication of present invention application FHSS, self adaptation complete data interference or repeatedly Frequency hopping communications after communication failure, enhances vulnerability to jamming and the reliability of data radio communication, meanwhile, with the spy of time-constrain Having Frame, the idle channel greatly reducing wireless strain sensing device unnecessary intercepts power consumption.The present invention is the nothing of strain Line detects a kind of method providing flexibility and reliability, not only reduces sensing device volume, and improves wireless strain detection Vulnerability to jamming and reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of wireless strain sensing device of the present invention.
Fig. 2 is lithium battery voltage of the present invention conversion and mu balanced circuit.
Fig. 3 is the present invention multiple bridge gating circuit.
Fig. 4 is signal conditioning circuit of the present invention.
Fig. 5 is that the present invention communicates the wireless communications mode under normal condition.
Fig. 6 is the wireless frequency hopping communication pattern that the present invention communicates under obstruction state.
Detailed description of the invention
For the ease of understanding the purpose of the present invention, technical scheme and advantage, the concrete reality to the present invention below in conjunction with the accompanying drawings The mode of executing makes further instructions.Should be appreciated that specific embodiments described herein is only used for explaining the present invention, not For limiting the invention.
Implement a kind of based on FHSS communication the bridge adjustable wireless strain sensing dress that the invention described above is provided Put, including the conversion of lithium battery output voltage and mu balanced circuit, multiple bridge gating circuit, signal conditioning circuit, cpu chip and outer Enclosing circuit and radio emitting modular circuit, its composition is: by the conversion of described lithium battery output voltage and mu balanced circuit, multiple bridge Road gating circuit, signal conditioning circuit, cpu chip and peripheral circuit and radio emitting modular circuit are integrated in one, and constitute and jump The bridge adjustable wireless strain sensing device of spread spectrum communication frequently, is used for detecting stress thing strain data.
Lithium battery output voltage therein conversion and mu balanced circuit are each modules in described wireless strain sensing device The power supply of circuit.
Multiple bridge gating circuit therein is selection and the bridge of electric bridge bridge needed for differently strained measurement occasion Zero waft school adjust.
Signal conditioning circuit therein is that the faint strain signal for detecting amplifies, filters and follow process；
Cpu chip therein and peripheral circuit are to export the AD conversion of analogue signal, the senior place of data for signal conditioning circuit Reason and and wireless transmitter module between communication connection.
Radio emitting modular circuit therein is the wireless-modulated for strain data and transmitting, real with wireless receiving module Existing wireless frequency hopping spread spectrum communication.
In the above-described embodiment, the output voltage of lithium battery is 12V, this voltage through voltage conversion chip BA033T and The voltage conversion circuit that BA05T is constituted, is respectively converted into 3.3V and 5V, and voltage stabilizing output, powers to each functional module.
In the above-described embodiment, multiple bridge gating circuit is to realize including half-bridge by selecting two toggle switch Wheatstone bridge, half-bridge double bridge and the gating of full-bridge, the strain measurement occasion required for different sensitivity.
In the above-described embodiment, cpu chip is SOC(system on a chip) level chip C8051F020, the process of wireless transmitter module Core is the wireless data sending chip nRF905 of DORNIC company of Norway；The two is carried out data transmission by SPI communication mode and controls The read-write of system order, completes conversion and the transmission of strain data.
In the above-described embodiment, the jumping of a kind of bridge adjustable wireless strain sensing device based on FHSS communication Frequently spectrum spread communication method, is to be applied to communication means between wireless strain transceiver module, and described communication means is as follows:
This wireless strain transceiver module is to be constituted hardware supported, wireless strain with C8051F020 and nRf905 radio transmitting and receiving chip Access based on carrier sense multiple/collide between transceiver module and avoid CSMA/CA agreement, use twice handshake mechanism of DATA/ACK Carrying out radio communication, wireless communication data frame includes strain data frame DATA and data acknowledgement frame ACK；
This strain data frame and data acknowledgement frame form are characterised by:
DATA: destination address+source address+66H+data+timed+ index_ch；
ACK: destination address+source address+77H+timef+ index_ch；
Wherein, timedRepresent that wireless receiving module receives the process time of DATA frame, timefRepresent and estimate the waiting time, i.e. send out Sending module to enter the length of one's sleep of sending mode next time after receiving ACK, index_ch represents communication channel call number；
This radio transmitting and receiving chip nRF905 works in 433MHz frequency range, uses 4 channels to communicate, respectively initial channel 427MHz(0) and alternate channel 431MHz(1), 435MHz(2), 439MHz(3), wherein 0,1,2,3 be respectively channel indexes number, Radio receiving transmitting module all works in initial channel 0 after powering on, and then carries out channel hopping at communication failure or when being interfered.
The process of this FHSS communication be wireless transmitter module when initial channel 0 listens to channel idle, first to nothing Line receiver module sends strain data frame DATA, and wireless transmitter module starts Preset Time timing, simultaneously enters reception state；Nothing Reception data, after initial channel 0 detects homogenous frequency signal, are carried out CRC check by line receiver module, extract also after verification is correct Strain data data in storage DATA frame, then starts to turn and jumps timing, send data validation frame ACK to wireless transmit mould simultaneously Block；If wireless transmitter module is in preset time t imepInside receiving ACK frame, Preset Time timing stops and resetting, now root According to ACK estimates waiting time timefEntering sleep state, the waiting time to rear oneself wakes up entrance transmission state up；If Wireless transmitter module is in preset time t imepInside it is not received by ACK frame, then retransmits a DATA frame, if at timepIn Do not receive ACK frame yet, then turn according to the rule of channel 0-3-1-2-0 and jump in alternate channel；And wireless receiving module turns in wait Jumping time timejAfter do not receive DATA frame yet, also turn according to the rule of channel 0-3-1-2-0 and jump in alternate channel, repeat afterwards Above-mentioned communication process.
Time thereinp> 2×timed , timej=2×timep+ timed , timep< timef < timej。
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is further illustrated.
As shown in Figure 1, a kind of bridge adjustable wireless strain sensing device based on FHSS communication, this device bag Include the conversion of lithium battery output voltage and mu balanced circuit, multiple bridge gating circuit, signal conditioning circuit, cpu chip and peripheral electricity Road, radio emitting modular circuit, and be integrated in one, constitute wireless strain sensing device.
As shown in Figure 2, implement a kind of lithium battery output voltage conversion provided by the present invention and mu balanced circuit be for The power supply of each modular circuit in whole device, this circuit includes 12V voltage-stabilizing output circuit, and this voltage supplies for part modulate circuit Electricity；12V turns 5V change-over circuit and mu balanced circuit, and voltage stabilizing output 5V, this voltage is for the power supply of three kinds of electric bridges；12V turns 3.3V and turns Changing circuit and mu balanced circuit, voltage stabilizing output 3.3V, this voltage is used for CPU and the power supply of wireless transmitter module.
As shown in Figure 3, implement one kind of multiple bridge gating circuits provided by the present invention and can be used for different strain spirits Sensitivity detection occasion, simply switched by the switch of toggle switch S1 and S2 realize half-bridge wheatstone bridge, half-bridge double bridge and The switching of full-bridge；After bridge is chosen, can by balance adjustable resistance realize zero under the non-stress of foil gauge waft school adjust.
Wherein, multiple bridge gating circuit includes: 6 toggle switch S1, S2, half-bridge wheatstone bridge, half-bridge double bridge And full-bridge, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, first balance adjustable resistance, second balance adjustable resistance, 3rd balance adjustable resistance, work compensating plate, the first working strain gauge, the second working strain gauge, the 3rd working strain gauge, and the 4th Working strain gauge, the 5th working strain gauge, the 6th working strain gauge, the 7th working strain gauge.
On the left of in the of the 1 of toggle switch S1,2,3, pin is connected leading-out terminal a, and on the left of in the of 4,5,6, pin is connected leading-out terminal b, Be connected on the right side of in the of the 1 of S1,4 leading-out terminal c, and the right side of 2,5 is connected leading-out terminal d, and the right side of 3,6 is connected leading-out terminal e；Ab terminates Entering 5V voltage stabilizing output, cd end is connected to the feeder ear of half-bridge wheatstone bridge, and ce end is connected to the feeder ear of half-bridge double bridge, and de terminates Feeder ear to full-bridge.
Respective pin leading-out terminal f, g, h, i, j, k respectively on the left of in the of the 1 of toggle switch S2,2,3,4,5,6, the 1 of S2,3,5 Right side pin is connected leading-out terminal l, and on the right side of in the of the 2 of S2,4,6, pin is connected leading-out terminal m, and terminal l, m access modulate circuit.
The 1 of S1,5 switches are allocated to right side, can complete the gating of half-bridge wheatstone bridge；The 1 of S2,2 switches are allocated to right side, i.e. Can complete the connection of half-bridge wheatstone bridge and modulate circuit, the now strain detecting sensitivity of wireless strain sensing device is Us/ 4。
On the left of half-bridge wheatstone bridge, brachium pontis is the first resistance and second resistance of 350 Ω, and right side brachium pontis is respectively 350 Ω's Working strain gauge and dummy gauge, working strain gauge is attached at measured object surface, and dummy gauge is attached at and measured object Part is with the compensation block surface of material.First resistance and the second resistance common port are connected to the terminal g of S2, simultaneously can with the first balance Adjusting the adjustable end of resistance to be connected, the first balance adjustable resistance is fixed end and is respectively connecting to cd end, the first resistance and the first work strain Sheet common port is connected to terminal c, and the first working strain gauge is connected to terminal f, the second resistance and benefit with work compensating plate common port Repay foil gauge common port and be connected to terminal d.
The 1 of S1,6 switches are allocated to right side, can complete the gating of half-bridge double bridge；The 3 of S2,4 switches are allocated to right side, i.e. Can complete the connection of half-bridge double bridge and modulate circuit, the now strain detecting sensitivity of wireless strain sensing device is Us/ 2, sensitivity is 2 times of half-bridge wheatstone bridge.
On the left of half-bridge double bridge, brachium pontis is the 3rd resistance and the 4th resistance of 350 Ω, and right side brachium pontis is respectively 350 Ω's Second working strain gauge and the 3rd working strain gauge, second, third working strain gauge is attached at measured object surface same position. 3rd resistance and the 4th resistance common port are connected to the terminal i of S2, are connected with the second balance adjustable end of adjustable resistance simultaneously, and second Balance adjustable resistance is fixed end and is respectively connecting to ce end, the 3rd resistance and the second working strain gauge common port and is connected to terminal c, the Two, the 3rd working strain gauge common port is connected to terminal h, and the 4th resistance and the 3rd working strain gauge common port are connected to terminal e.
The 3 of S1,5 switches are allocated to right side, can complete the gating of full-bridge electric bridge；The 3 of S2,4 switches are allocated to right side, can be complete Becoming the connection of full-bridge and modulate circuit, the now strain detecting sensitivity of wireless strain sensing device is Us, sensitivity is half-bridge 4 times of wheatstone bridge.
The each brachium pontis of full-bridge is the four, the five, the six, the 7th working strain gauges of 350 Ω, is all attached at measured object surface phase Co-located.Six, the 7th working strain gauge common ports are connected to the terminal k of S2, simultaneously with the 3rd balance adjustable end of adjustable resistance Being connected, the 3rd balance adjustable resistance is fixed end and is respectively connecting to de end, and the four, the 7th working strain gauge common ports are connected to terminal D, the four, the 5th working strain gauge common ports are connected to terminal j, and the five, the 6th working strain gauge common ports are connected to terminal e.
As shown in Figure 4, implementing a kind of signal conditioning circuit provided by the present invention should for the faint of strain measurement The amplification of varying signal, filter and follow process.The gain amplifier of modulate circuit is 75 times, and filtering passband cut-off frequency is 50Hz。
Wherein, the one-level differential amplifier circuit that AD620 is constituted, the gain amplifier of this circuit depends on gain resistor R6, should The input of circuit respectively adds single order RC filter circuit, and filter pass band cut-off frequency is 50Hz.
What OP07 was constituted is the second-order low-pass filter circuit of 1.5 times of gains, and circuit gain is determined by R4 and R3, low-pass filtering Cut-off frequency is determined by R7, R8, C2, C3.The output of filter circuit be directly connected to LM358 constitute voltage follower circuit, rise every From cushioning effect, and improve its load capacity.The output of voltage follower circuit is directly connected to the analog acquisition pin of CPU.
Described CPU is that SOC(system on a chip) level chip C8051F020, cpu chip and peripheral circuit thereof are for signal conditioning circuit The output AD conversion of analogue signal, voltage digital amount are between conversion and CPU and the wireless transmitter module of strain digital quantity Communication connection.After CPU processes, the voltage analog signal of reaction strain is converted to the strain digital quantity of correspondence, passes through SPI Strain digital quantity is sent to wireless transmitter module by communication, finally passes through antenna after wireless transmitter module core nRF905 is modulated Signal is launched by the electromagnetic wave with mid frequency as 433MHz.
The FHSS communication means of above-mentioned bridge adjustable wireless strain sensing device based on FHSS communication is such as Under:
Wireless transmitter module is set and receiver module works in initial channel 0；
Wireless transmitter module first passes through after intercepting idle channel, launches strain data frame DATA, then carries out Preset Time timing, Simultaneously enter wireless receiving state；
Reception data, after initial channel 0 detects homogenous frequency signal, are carried out CRC check, after verification is correct by wireless receiving module Extract and store the strain data data in DATA frame, jump timing subsequently into turning, send data validation frame ACK to wireless simultaneously Transmitter module；
If wireless transmitter module is in preset time t imepInside receiving ACK frame, Preset Time resets, now according in ACK Estimate waiting time timefEntering sleep state, the waiting time wakes up up to rear oneself；
If wireless transmitter module is in preset time t imepInside it is not received by ACK frame, then retransmits a DATA frame, if At timepDo not receive ACK frame the most yet, then turn according to the rule of channel 0-3-1-2-0 and jump in alternate channel；
And wireless receiving module turns jumping time time in waitjAfter do not receive DATA frame yet, according to the rule of channel 0-3-1-2-0 yet Rule turns jumps in alternate channel, repeats above-mentioned communication process afterwards.
Lift a specific embodiment below based on accompanying drawing, the present invention is described in further detail.
Accompanying drawing 1 show embodiment of the present invention bridge adjustable wireless strain sensing apparatus structure schematic diagram, this device bag Include: the conversion of lithium battery output voltage and mu balanced circuit, multiple bridge gating circuit, signal conditioning circuit, cpu chip and peripheral electricity Road, radio emitting modular circuit.
Wherein, the conversion of lithium battery output voltage and mu balanced circuit, it is provided that digital voltage 12V required in this device circuit, 5V, 3.3V, analog voltage 3.3V；The precision resistance that first, second, third and fourth resistance is 350 Ω in multiple bridge gating circuit, Working strain gauge and the strain resistor of dummy gauge that three kinds of bridges are external are 350 Ω；The resistance range of balance adjustable resistance 0-10kΩ；Gain resistor R in modulate circuit6Being set to 1k Ω, the gain amplifier of differential amplifier circuit is 50 times；Step low-pass In filter circuit, R4 is 20 k Ω, and when R3 is 10 k Ω, gain amplifier is 1.5 times, when R7 be 7.87 k Ω, R8 be 14.7 k Ω, C2 are 0.47μF, C3 are 0.22μDuring F, low-pass filtering cut-off frequency is 50Hz.So the gain amplifier of whole modulate circuit Being 75 times, low-pass filtering cut-off frequency is 50Hz.
As shown in Figure 3, when 1,5 switches of toggle switch S1 are allocated to right side, the gating of half-bridge wheatstone bridge can be completed, The 1 of S2,2 switches are allocated to right side, can complete the connection of half-bridge wheatstone bridge and modulate circuit, such half-bridge single armed strain bridge Just constitute the radio detection circuit of strain, now wireless strain sensing device with modulate circuit, CPU and wireless transmitter module Strain detecting sensitivity is Us/4.Wherein, working strain gauge external in half-bridge wheatstone bridge is attached at measured object surface, and The external active gage that compensates is attached at the compensation block surface of material identical with measured object.
After an initial power up, first pass through adjustment adjustable resistance, carry out the zeroing calibration strained at wireless receiving end, with Eliminate zero to waft the error caused.
To be calibrated complete after re-power, as shown in Figure 5, wireless strain sensing device first works in initial channel 0, with nothing It is mutual that line receiver module carries out wireless data with strain data frame DATA and data acknowledgement frame ACK；Shown in institute Fig. 6, when communication is handed over Mutually failure or when being disturbed by homogenous frequency signal, wireless strain sensing device and wireless receiving module according to corresponding sequential with The jumping rule that turns of channel 0-3-1-2-0 carries out FHSS communication.
The enforcement of technical scheme in sum, its feature is that the present invention proposes a kind of adjustable wireless strain of bridge and passes Induction device and wireless frequency hopping spectrum spread communication method, on the one hand, achieve half-bridge wheatstone bridge, half-bridge double bridge, full-bridge should Become the flexible switching of bridge, be adapted to the strain detecting requirement of different sensitivity, simplify strain detecting circuit, reduce hard The volume of part circuit, reduces power consumption；On the other hand, the communication of FHSS, self adaptation completes data in interference Or the repeatedly frequency hopping communications after communication failure, enhances the vulnerability to jamming of data radio communication, meanwhile, with the spy of time-constrain Having Frame, the idle channel greatly reducing wireless strain sensing device unnecessary intercepts power consumption.The present invention is the nothing of strain Line detects a kind of method providing flexibility and reliability, not only reduces sensing device volume, and improves wireless strain detection Reliability and motility.

Claims (7)

1. a bridge adjustable wireless strain sensing device based on FHSS communication, changes including lithium battery output voltage And mu balanced circuit, multiple bridge gating circuit, signal conditioning circuit, cpu chip and peripheral circuit and radio emitting modular circuit, It is characterized in that: by described lithium battery output voltage conversion and mu balanced circuit, multiple bridge gating circuit, signal conditioning circuit, Cpu chip and peripheral circuit and radio emitting modular circuit are integrated in one, and constitute the adjustable nothing of bridge of FHSS communication Line strain sensing device, is used for detecting stress thing strain data；
The conversion of described lithium battery output voltage and mu balanced circuit each modular circuit in described wireless strain sensing device Power supply；
Described multiple bridge gating circuit is the selection of electric bridge bridge needed for differently strained measurement occasion and bridge zero is waftd school Adjust；
Described signal conditioning circuit is that the faint strain signal for detecting amplifies, filters and follow process；
Described cpu chip and peripheral circuit are to export the AD conversion of analogue signal, data advanced processes for signal conditioning circuit And and wireless transmitter module between communication connection；
Described radio emitting modular circuit is the wireless-modulated for strain data and transmitting, realizes wireless with wireless receiving module FHSS communicates.
2. wireless strain sensing device as claimed in claim 1, it is characterised in that: described lithium battery output voltage is 12V, should The voltage conversion circuit that voltage is constituted through voltage conversion chip BA033T and BA05T, is respectively converted into 3.3V and 5V, and voltage stabilizing is defeated Go out, power to each functional module.
3. wireless strain sensing device as claimed in claim 1, it is characterised in that: described multiple bridge gating circuit is to pass through Select two toggle switch to realize including half-bridge wheatstone bridge, half-bridge double bridge and the gating of full-bridge, for different sensitive The strain measurement occasion that degree requires.
4. wireless strain sensing device as claimed in claim 1, it is characterised in that: described cpu chip is SOC(system on a chip) level core Sheet C8051F020, the process core of wireless transmitter module is the wireless data sending chip nRF905 of DORNIC company of Norway；The two is logical Cross SPI communication mode and carry out data transmission the read-write with control command, complete conversion and the transmission of strain data.
A kind of frequency hopping of bridge adjustable wireless strain sensing device based on FHSS communication Spectrum spread communication method, is to be applied to communication means between wireless strain transceiver module, and described communication means is as follows:
Described wireless strain transceiver module is to be constituted hardware supported with C8051F020 and nRf905 radio transmitting and receiving chip, wireless should Become between transceiver module based on carrier sense multiple access/collision avoids CSMA/CA agreement, uses DATA/ACK to shake hands for twice machine System carries out radio communication, and wireless communication data frame includes strain data frame DATA and data acknowledgement frame ACK；
Described strain data frame and data acknowledgement frame form are characterised by:
DATA: destination address+source address+66H+data+timed+ index_ch；
ACK: destination address+source address+77H+timef+ index_ch；
Wherein, timedRepresent that wireless receiving module receives the process time of DATA frame, timefRepresent and estimate the waiting time, i.e. send out Sending module to enter the length of one's sleep of sending mode next time after receiving ACK, index_ch represents communication channel call number；
Described radio transmitting and receiving chip nRF905 works in 433MHz frequency range, uses 4 channels to communicate, respectively initial channel 427MHz(0) and alternate channel 431MHz(1), 435MHz(2), 439MHz(3), wherein 0,1,2,3 be respectively channel indexes number, Radio receiving transmitting module all works in initial channel 0 after powering on, and then carries out channel hopping at communication failure or when being interfered.
6. FHSS communication means as claimed in claim 5, the process of described FHSS communication is wireless transmitter module When initial channel 0 listens to channel idle, first sending strain data frame DATA to wireless receiving module, wireless transmitter module is opened Beginning Preset Time timing, simultaneously enters reception state；Wireless receiving module, after initial channel 0 detects homogenous frequency signal, will connect Receive data and carry out CRC check, after verification is correct, extract and store the strain data data in DATA frame, then start to turn to jump meter Time, send data validation frame ACK to wireless transmitter module simultaneously；If wireless transmitter module is in preset time t imepInterior reception To ACK frame, Preset Time timing stops and resetting, now according to estimating waiting time time in ACKfEnter sleep state, Waiting time wakes up entrance transmission state up to rear oneself；If wireless transmitter module is in preset time t imepInside it is not received by ACK frame, then retransmit a DATA frame, if at timepDo not receive ACK frame the most yet, then according to the rule of channel 0-3-1-2-0 Turn and jump in alternate channel；And wireless receiving module turns jumping time time in waitjAfter do not receive DATA frame yet, according to channel 0-yet The rule of 3-1-2-0 turns jumps in alternate channel, repeats above-mentioned communication process afterwards.
7. FHSS communication means as claimed in claim 6, described timep> 2×timed , timej=2×timep+ timed , timep< timef < timej。
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CN107246861A (en) * 2017-07-11 2017-10-13 汉正检测技术有限公司 A kind of strain detection testing device
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CN111049551A (en) * 2019-12-31 2020-04-21 郑州航空工业管理学院 Anti-interference transmission device of network signal
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