CN106981188A - A kind of wireless sensing network system and its operation method based on vibrating string type sensor - Google Patents
A kind of wireless sensing network system and its operation method based on vibrating string type sensor Download PDFInfo
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- CN106981188A CN106981188A CN201710260463.5A CN201710260463A CN106981188A CN 106981188 A CN106981188 A CN 106981188A CN 201710260463 A CN201710260463 A CN 201710260463A CN 106981188 A CN106981188 A CN 106981188A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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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
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of wireless sensing network system and its operation method based on vibrating string type sensor, the system includes vibrating string type sensor, wireless sensing unit, ZigBee USB devices and computer；Vibrating string type sensor is connected with wireless sensing unit, and ZigBee USB devices are connected by USB interface with computer；Vibrating string type sensor and wireless sensing unit collectively constitute radio sensing network.The wireless sensing network system of the present invention replaces cable transmission with radio communication, eliminates the trouble of wiring, field data transmission network is quickly built, improve efficiency, reduces the cost of system Construction.Automatic network-building can be realized between wireless sensing unit, there is more preferable applicability to the complex conditions of engineering site, is that reduction structural healthy monitoring system construction and maintenance cost are made contributions.
Description
Technical field
The present invention relates to wireless sensing network system, more particularly to a kind of radio sensing network based on vibrating string type sensor
System and its operation method.
Background technology
Ess-strain is the important indicator for reflecting structure stress situation, if the safe condition of GPRS structure must be answered
Stress-strain is measured, and stress-strain measurement is the important component of monitoring structural health conditions.
Large scale structure construction is complicated, to grasp the stressing conditions of structure comprehensively, it is necessary to constitute component to structure difference
Diverse location carries out ess-strain monitoring, and this will cause ess-strain point position to be distributed scattered and substantial amounts.Existing knot
Structure health monitoring system is substantially all to be carried out data transmission by the way of wire transmission.Although wired data transfer mode has
Efficiency of transmission is high, data stabilization is reliable and the advantages of technology maturation, but needs to lay a large amount of cables in system installation process,
This can bring a series of problem：(1) certain structures site environment is more severe, difficult wiring or can influence the attractive in appearance of structure；(2)
In some cases, strict is required, it is necessary to which quick measurement, wired system is difficult to meet wanting for this kind of occasion to the opportunity of measurement
Ask, for example loading test；(3) the system set-up time based on wired data transfer mode is long, and required man power and material is more,
Inevitably result in the increase of cost；(4) cable is easily damaged, and protects highly difficult, and this also gives the management of wired health monitoring systems
Many problems are brought with maintenance.
Radio sensing network (Wireless Sensor Network, WSN) is the substantial amounts of micro sensing in monitored area
Device node, passes through communication, a multi-hop of composition, the network system of self-organizing.The purpose is to collaborative sensing, adopt
The information of perceptive object in collection and processing monitored area, and it is sent to by way of radio communication observer.
The content of the invention
The invention aims to solve the amount of wiring that wired data transfer mode is present in current structure health monitoring
Greatly, install and maintenance cost it is high, in labyrinth the problems such as difficult wiring, should for what is largely used in monitoring structural health conditions
Becoming sensor, there is provided a kind of wireless sensing network system and its operation method based on vibrating string type sensor.
The present invention is achieved through the following technical solutions：
A kind of wireless sensing network system based on vibrating string type sensor, including such as lower component：
Vibrating string type sensor 1；
Wireless sensing unit 2；
ZigBee-USB equipment 3；
Computer 4；
The vibrating string type sensor 1 is connected with wireless sensing unit 2；
The ZigBee-USB equipment 3 is connected by USB interface with computer 4；
The vibrating string type sensor 1 and wireless sensing unit 2 collectively constitute radio sensing network.
The wireless sensing unit 2 includes such as lower component：
Data acquisition module 7；
Data processing and control module 8；
First radio receiving transmitting module 9；
Energy supply module 10；
The data acquisition module 7 is connected with vibrating string type sensor 1；
The data processing is connected with the radio receiving transmitting module 9 of data acquisition module 7 and first respectively with control module 8；
The energy supply module 10 is data acquisition module 7, data processing and the wireless receiving and dispatching of control module 8 and first
The work of module 9 provides energy.
The data acquisition module 7 includes such as lower component：
Low pressure scanning frequency excitation circuit；
Pick-up circuit；
The low pressure scanning frequency excitation circuit enters row energization in the way of low pressure frequency sweep to the string wire of vibrating string type sensor 1, makes
Its starting of oscillation；
The pick-up circuit is used to be amplified the output signal of vibrating string type sensor 1, filtered and Shape correction；
The data processing uses STM32F103RBT6 chips with control module 8.
First radio receiving transmitting module 9 uses CC2530 chips.
The energy supply module 10 is battery pack (using the series connection of six batteries).
The ZigBee-USB equipment 3 includes such as lower component：
Second radio receiving transmitting module 11；
USB level shifting circuits 12；
Second radio receiving transmitting module 11 is connected by USB level shifting circuits 12 with computer 4.
Second radio receiving transmitting module 11 uses the CC2531 chips with USB interface.
The operation method of wireless sensing network system of the invention based on vibrating string type sensor, comprises the following steps：
Step one：Computer (4) is connected by searching for equipment to be set up with neighbouring wireless sensing unit (2)；
Step 2：Computer (4) sends instructions to ZigBee-USB equipment (3), ZigBee-USB by specified serial ports
Equipment (3) converts the message into the data format of ZigBee communication agreement, is sent to specified wireless sensing unit (2)；
Step 3：The first radio receiving transmitting module (9) in wireless sensing unit (2) is received after data, according to communication protocol
Data are explained, are clearly a collection signals by the instruction in data, then by the control electricity of the first radio receiving transmitting module (9)
Road wakes up data processing and control module (8)；
Step 4：Data processing carries out low pressure frequency sweep collection one with control module (8) by control data acquisition module (7)
Secondary data, collect and the first radio receiving transmitting module (9) are transferred to after value, and data processing enters park mode with control module (8)
Wait wakes up next time；
Step 5：First radio receiving transmitting module (9) receives collection result, is sent to according to the data format of communication protocol
Data are changed into USB serial ports forms by ZigBee-USB equipment (3), ZigBee-USB equipment (3), are sent to computer (4) software
The serial ports at end；
Step 6：Computer (4) is received after signal, and analysis communications protocol format draws the numerical value such as frequency, temperature and voltage,
And strain is calculated, value, which is then pushed to Main form, is shown and is recorded.
The operation method of wireless sensing network system of the invention based on vibrating string type sensor, comprises the following steps：
Vibrating string type sensor (1) operating procedure：
It is the uniform string wire (5) that a two ends consolidate and are tensioned inside vibrating string type sensor, when in vibrating string type sensor
Coil (6) in add pumping signal after, from faraday electromagnetic induction principle, string wire (5) understand it is made by magnetic field
With then string wire (5) starts starting of oscillation；
When adding pumping signal in stopping to coil (6), string wire (5) proceeds by the vibration of damping, and string wire (5) exists
During vibration, the magnetic induction line in magnetic field can be cut, make to change by the magnetic flux of coil, by faraday electromagnetic induction
Principle is understood, measurable alternation induced electromotive force, the frequency as string wire for the induced electromotive force surveyed will be produced in coil
(5) vibration frequency；
As long as measuring the vibration frequency of string wire (5), it can just be strained by the frequency and the relation of strain of string wire (5),
Frequency and the relation strained are as follows：
In formula, f is string wire vibration frequency, and l is string wire length, and T is string wire tension force, and ρ is string wire line density, and s is that string wire is horizontal
Sectional area, σ is string wire stress, ρvFor the volume density (ρ of string wirev=ρ/s), E is the modulus of elasticity of string wire, and ε is the strain of string wire；
Wireless sensing unit (2) operating procedure：
Wireless sensing unit (2) receives the instruction of computer (4), single-chip microcomputer output by the first radio receiving transmitting module (9)
(frequency changes according to certain rules) current square-wave signal；
Square-wave signal isolates interference signal by photoelectric isolating circuit first, is then put by prime power amplifying circuit
Greatly, finally it is loaded into as pumping signal on the coil of vibrating string type sensor (1) (6)；
Electric current in coil (6) can produce the periodically variable magnetic field of corresponding frequencies, because string wire (5) is located at magnetic field
In, it will be acted on by alternating force, when the intrinsic frequency of the frequency and string wire (5) of signal is close, and string wire (5) can be rapid
Resonance state is reached, is so as to the frequency by starting of oscillation and output voltage signal, its induced electromotive force produced in coil (6)
It is the intrinsic frequency of string wire (5), the frequency of its output signal is determined by vibrating string type sensor (1) stress intensity；
Pick-up circuit is amplified to the output signal of vibrating string type sensor (1), filtered and Shape correction, obtains some frequency
The square-wave signal of rate, the timer collection square-wave signal built in single-chip microcomputer, so as to calculate frequency values.
The present invention has the following advantages and effect relative to prior art：
The present invention replaces cable transmission with radio communication, and the trouble of wiring is eliminated first, secondly field data transmission network
Network can quickly be built, and improve efficiency, reduce the cost of system Construction.Network knot is defined by wireless protocols
Structure, then controls the addition and deletion of sensor node by software, makes the extension of sensor network and has safeguarded to be permitted simple
It is many.Data transfer wireless penetration can be made structural stress strain monitoring from the limitation of site environment, and carry by radio sensing network
The efficiency of high in-site measurement.
The present invention uses commercially available standard vibrating string type strain transducer, does not change the construction of sensor, is protected from source
Sensing testing precision is demonstrate,proved；By wireless sensing unit, the undue dependence to external product can be avoided, at the same can according to research and development and
Use demand makees depth customization to the function and performance of wireless sensing unit；Wireless sensing unit can carry out the data point of Engineering
Analysis is handled, and original data transmissions amount is reduced, to reduce system power dissipation；Automatic network-building can be realized between wireless sensing unit, it is right
The complex conditions of engineering site have more preferable applicability, are that reduction structural healthy monitoring system construction and maintenance cost make tribute
Offer.
Brief description of the drawings
Fig. 1 is the wireless sensing network system structural representation of the invention based on vibrating string type sensor.
Fig. 2 is vibrating string type sensor structural representation of the present invention.
Fig. 3 is the structural principle block diagram of wireless sensing unit of the present invention.
Fig. 4 is low pressure scanning frequency excitation electrical block diagram of the present invention.
Fig. 5 is pick-up electrical block diagram of the present invention.
Fig. 6 is the structural principle block diagram of ZigBee-USB equipment of the present invention.
Embodiment
The present invention is more specifically described in detail with reference to specific embodiment.
Such as Fig. 1；The invention discloses a kind of radio sensing network based on vibrating string type sensor, including vibrating string type sensor
1st, wireless sensing unit 2, ZigBee-USB equipment 3 and computer 4；The vibrating string type sensor 1 is connected with wireless sensing unit 2
Connect, the ZigBee-USB equipment 3 is connected by USB interface with computer 4；The vibrating string type sensor 1 and wireless sensing list
Member 2 collectively constitutes radio sensing network.
The vibrating string type sensor 1 can be arranged on works surface, and it uses JMZX-212AT type vibrating string extensometers,
Operation principle is as shown in Figure 2.
Figure it is seen that be the uniform string wire 5 that two ends consolidate and are tensioned inside vibrating string type sensor, when
Added in the coil 6 of vibrating string type sensor after pumping signal, from faraday electromagnetic induction principle, string wire 5 can be by magnetic field
Effect to it, the then beginning of string wire 5 starting of oscillation；When stopping adding pumping signal into coil 6, string wire 5 has proceeded by resistance
The vibration of Buddhist nun, string wire 5 can cut to the magnetic induction line in magnetic field in vibration, make to change by the magnetic flux of coil,
Measurable alternation induced electromotive force, the induction electric surveyed will be produced from faraday electromagnetic induction principle, in coil
The frequency of gesture is the vibration frequency of string wire 5.Frequency that just can be by string wire 5 as long as measuring the vibration frequency of string wire 5 and strain
Relation strained, frequency and strain relation it is as follows：
In formula, f is string wire vibration frequency, and l is string wire length, and T is string wire tension force, and ρ is string wire line density, and s is that string wire is horizontal
Sectional area, σ is string wire stress, ρvFor the volume density (ρ of string wirev=ρ/s), E is the modulus of elasticity of string wire, and ε is the strain of string wire.
The wireless sensing unit 2 is used for the frequency measurement for completing vibrating string type sensor 1, and each wireless sensing unit 2 is such as
Shown in Fig. 3.
From figure 3, it can be seen that it includes data acquisition module 7, data processing and control module 8, the first wireless receiving and dispatching mould
Block 9 and energy supply module 10, wherein data acquisition module 7 include low pressure scanning frequency excitation circuit and pick-up circuit, described low
Pressure scanning frequency excitation circuit and pick-up circuit are connected with vibrating string type sensor 1 respectively, and data processing is with control module 8 using ST (meanings
Method semiconductor company) STM32F103RBT6 singlechip chips, respectively with low pressure scanning frequency excitation circuit, pick-up circuit and first
Radio receiving transmitting module 9 is connected, and energy supply module 10 saves No. 5 dry cells using 6, for for data acquisition module 7, data processing
Energy is provided with the radio receiving transmitting module 9 of control module 8 and first；
The operation principle of wireless sensing unit 2 is specially：Wireless sensing unit 2 is received by the first radio receiving transmitting module 9
The instruction of computer 4, the current square-wave signal that single-chip microcomputer STM32F103RBT6 output frequencies change according to certain rules, signal is first
Interference signal is first isolated by photoelectric isolating circuit, is then amplified by prime power amplifying circuit, finally as excitation letter
Number it is loaded on vibrating string type sensor coil 6 (as shown in Figure 4), the periodicity that the electric current in coil 6 can produce corresponding frequencies becomes
The magnetic field of change, due to string wire 5 be located at magnetic field in, it will be acted on by alternating force, when signal frequency and string wire 5 it is intrinsic
When frequency is close, string wire 5 can be rapidly reached resonance state, so as to which by starting of oscillation and output voltage signal, it is produced in coil 6
Induced electromotive force frequency be string wire 5 intrinsic frequency, the frequency of its output signal is by the stress intensity of vibrating string type sensor 1
Determine；
Pick-up circuit (as shown in Figure 5) is amplified to the output signal of vibrating string type sensor 1, filtered and Shape correction,
The square-wave signal of some frequency is obtained, the timer collection square-wave signal built in single-chip microcomputer STM32F103RBT6, so as to calculate
Frequency values.
As shown in fig. 6, the ZigBee-USB equipment 3 includes the second radio receiving transmitting module 11 and USB level shifting circuits
12, the second radio receiving transmitting module 11 is connected by USB level shifting circuits 12 with computer 4, and carrying out serial ports with computer 4 leads to
Letter.
First radio receiving transmitting module 9 uses CC2530 chips, and second radio receiving transmitting module 11 is connect using band USB
The CC2531 chips of mouth.
The operation method of wireless sensing network system of the invention based on vibrating string type sensor, can be real by following steps
It is existing：
(1) computer 4 is connected by searching for equipment to be set up with neighbouring wireless sensing unit 2；
(2) computer 4 sends instructions to ZigBee-USB equipment 3 by specified serial ports, and ZigBee-USB equipment 3 is letter
Breath is converted into the data format of ZigBee communication agreement, is sent to specified wireless sensing unit 2；
(3) the first radio receiving transmitting module 9 in wireless sensing unit 2 is received after data, and data are explained according to communication protocol,
Clearly it is a collection signal by the instruction in data, data is then waken up by the control circuit of the first radio receiving transmitting module 9
Processing and control module 8；
(4) data processing carries out low pressure frequency sweep by control data acquisition module 7 with control module 8 and gathers a data,
Collect and the first radio receiving transmitting module 9 is transferred to after value, data processing enters park mode wait with control module 8 and called out next time
Wake up；
(5) first radio receiving transmitting modules 9 receive collection result, and Zigbee- is sent to according to the data format of communication protocol
Data are changed into USB serial ports forms by USB device 3, Zigbee-USB equipment 3, are sent to the serial ports of the software end of computer 4；
(6) computer 4 is received after signal, and analysis communications protocol format draws the numerical value such as frequency, temperature and voltage, and calculates
Go out strain, value is then pushed to Main form and is shown and is recorded.
As described above, the present invention can be better realized.
Embodiments of the present invention are simultaneously not restricted to the described embodiments, other any Spirit Essences without departing from the present invention
With the change made under principle, modification, replacement, combine, simplify, should be equivalent substitute mode, be included in the present invention
Within protection domain.
Claims (10)
1. a kind of wireless sensing network system based on vibrating string type sensor, it is characterised in that including such as lower component：
Vibrating string type sensor (1)；
Wireless sensing unit (2)；
ZigBee-USB equipment (3)；
Computer (4)；
The vibrating string type sensor (1) is connected with wireless sensing unit (2)；
The ZigBee-USB equipment (3) is connected by USB interface with computer (4)；
The vibrating string type sensor (1) and wireless sensing unit (2) collectively constitute radio sensing network.
2. the wireless sensing network system based on vibrating string type sensor according to claim 1, it is characterised in that：It is described wireless
Sensing unit (2) includes such as lower component：
Data acquisition module (7)；
Data processing and control module (8)；
First radio receiving transmitting module (9)；
Energy supply module (10)；
The data acquisition module (7) is connected with vibrating string type sensor (1)；
The data processing is connected with data acquisition module (7) and the first radio receiving transmitting module (9) respectively with control module (8)；
The energy supply module (10) is data acquisition module (7), data processing and control module (8) and the first wireless receipts
The work for sending out module (9) provides energy.
3. the wireless sensing network system based on vibrating string type sensor according to claim 2, it is characterised in that：The data
Acquisition module (7) includes such as lower component：
Low pressure scanning frequency excitation circuit；
Pick-up circuit；
The low pressure scanning frequency excitation circuit enters row energization in the way of low pressure frequency sweep to the string wire of vibrating string type sensor (1), makes it
Starting of oscillation；
The pick-up circuit is used to be amplified the output signal of vibrating string type sensor (1), filtered and Shape correction.
4. the wireless sensing network system based on vibrating string type sensor according to claim 2, it is characterised in that：The data
Processing uses STM32F103RBT6 chips with control module (8).
5. the wireless sensing network system based on vibrating string type sensor according to claim 2, it is characterised in that：Described first
Radio receiving transmitting module (9) uses CC2530 chips.
6. the wireless sensing network system based on vibrating string type sensor according to claim 2, it is characterised in that：The energy
Supply module (10) is battery pack.
7. the wireless sensing network system based on vibrating string type sensor according to claim 1, it is characterised in that：It is described
ZigBee-USB equipment (3) includes such as lower component：
Second radio receiving transmitting module (11)；
USB level shifting circuits (12)；
Second radio receiving transmitting module (11) is connected by USB level shifting circuits (12) with computer (4).
8. the wireless sensing network system based on vibrating string type sensor according to claim 7, it is characterised in that：Described second
Radio receiving transmitting module (11) uses the CC2531 chips with USB interface.
9. the operation method of the wireless sensing network system based on vibrating string type sensor described in claim 8, it is characterised in that bag
Include following steps：
Step one：Computer (4) is connected by searching for equipment to be set up with neighbouring wireless sensing unit (2)；
Step 2：Computer (4) sends instructions to ZigBee-USB equipment (3), ZigBee-USB equipment by specified serial ports
(3) data format of ZigBee communication agreement is converted the message into, specified wireless sensing unit (2) is sent to；
Step 3：The first radio receiving transmitting module (9) in wireless sensing unit (2) is received after data, is explained according to communication protocol
Data, are clearly a collection signals by the instruction in data, are then called out by the control circuit of the first radio receiving transmitting module (9)
Awake data processing and control module (8)；
Step 4：Data processing carries out low pressure frequency sweep by control data acquisition module (7) with control module (8) and gathers a number
According to, collect and the first radio receiving transmitting module (9) is transferred to after value, data processing and control module (8) entrance park mode wait
Wake up next time；
Step 5：First radio receiving transmitting module (9) receives collection result, is sent to according to the data format of communication protocol
Data are changed into USB serial ports forms by ZigBee-USB equipment (3), ZigBee-USB equipment (3), are sent to computer (4) software
The serial ports at end；
Step 6：Computer (4) is received after signal, and analysis communications protocol format draws the numerical value such as frequency, temperature and voltage, and counts
Strain is calculated, value, which is then pushed to Main form, is shown and recorded.
10. the operation method of the wireless sensing network system based on vibrating string type sensor described in claim 8, it is characterised in that bag
Include following steps：
Vibrating string type sensor (1) operating procedure：
It is the uniform string wire (5) that a two ends consolidate and are tensioned inside vibrating string type sensor, when the line in vibrating string type sensor
Enclose in (6) and add after pumping signal, from faraday electromagnetic induction principle, string wire (5) can be acted on it by magnetic field, in
It is that string wire (5) starts starting of oscillation；
When adding pumping signal in stopping to coil (6), string wire (5) proceeds by the vibration of damping, and string wire (5) is in vibration
When, the magnetic induction line in magnetic field can be cut, make to change by the magnetic flux of coil, by faraday electromagnetic induction principle
Understand, measurable alternation induced electromotive force will be produced in coil, the frequency for the induced electromotive force surveyed is string wire (5)
Vibration frequency；
As long as measuring the vibration frequency of string wire (5), it can just be strained by the frequency and the relation of strain of string wire (5), frequency
Relation with strain is as follows：
In formula, f is string wire vibration frequency, and l is string wire length, and T is string wire tension force, and ρ is string wire line density, and s is string wire cross section
Product, σ is string wire stress, ρvFor the volume density (ρ of string wirev=ρ/s), E is the modulus of elasticity of string wire, and ε is the strain of string wire；
Wireless sensing unit (2) operating procedure：
Wireless sensing unit (2) receives the instruction of computer (4), single-chip microcomputer output current by the first radio receiving transmitting module (9)
Square-wave signal；
Square-wave signal isolates interference signal by photoelectric isolating circuit first, is then amplified by prime power amplifying circuit,
Finally it is loaded into as pumping signal on the coil of vibrating string type sensor (1) (6)；
Electric current in coil (6) can produce the periodically variable magnetic field of corresponding frequencies, because string wire (5) is located in magnetic field, it
It will be acted on by alternating force, when the intrinsic frequency of the frequency and string wire (5) of signal is close, string wire (5) can be rapidly reached
Resonance state, so as to which by starting of oscillation and output voltage signal, the frequency of its induced electromotive force produced in coil (6) is steel
The intrinsic frequency of string (5)；
Pick-up circuit is amplified to the output signal of vibrating string type sensor (1), filtered and Shape correction, obtains some frequency
Square-wave signal, the timer collection square-wave signal built in single-chip microcomputer, so as to calculate frequency values.
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| CN108346275A (en) * | 2018-05-11 | 2018-07-31 | 东华理工大学 | A kind of vibrating string type sensor synthesis reading survey device based on 4G networks |
| CN108538043A (en) * | 2018-06-01 | 2018-09-14 | 华南理工大学 | A kind of bridge strain monitoring system and method based on the WIFI communication technologys |
| CN108895995A (en) * | 2018-06-01 | 2018-11-27 | 华南理工大学 | A kind of wireless vibratory string strain acquirement device and its implementation based on WIFI |
| CN108922147A (en) * | 2018-08-01 | 2018-11-30 | 水利部交通运输部国家能源局南京水利科学研究院 | Vibrating wire sensor acquisition system and method and apparatus based on wireless sensor network |
| CN109300292A (en) * | 2018-07-30 | 2019-02-01 | 中铁七局集团西安铁路工程有限公司 | A kind of support shaft force automatic monitoring transmitting device based on Internet of Things |
| CN109632155A (en) * | 2018-12-19 | 2019-04-16 | 上海建工集团股份有限公司 | Single-point type acquires device and method without uniaxial stress |
| CN110940447A (en) * | 2019-12-10 | 2020-03-31 | 上海宏信设备工程有限公司 | Monitoring system of wireless excavation supporting atress |
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| CN109300292A (en) * | 2018-07-30 | 2019-02-01 | 中铁七局集团西安铁路工程有限公司 | A kind of support shaft force automatic monitoring transmitting device based on Internet of Things |
| CN108922147A (en) * | 2018-08-01 | 2018-11-30 | 水利部交通运输部国家能源局南京水利科学研究院 | Vibrating wire sensor acquisition system and method and apparatus based on wireless sensor network |
| CN109632155A (en) * | 2018-12-19 | 2019-04-16 | 上海建工集团股份有限公司 | Single-point type acquires device and method without uniaxial stress |
| CN110940447A (en) * | 2019-12-10 | 2020-03-31 | 上海宏信设备工程有限公司 | Monitoring system of wireless excavation supporting atress |
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