CN206563626U - The measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum - Google Patents
The measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum Download PDFInfo
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- CN206563626U CN206563626U CN201720045897.9U CN201720045897U CN206563626U CN 206563626 U CN206563626 U CN 206563626U CN 201720045897 U CN201720045897 U CN 201720045897U CN 206563626 U CN206563626 U CN 206563626U
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Abstract
The utility model is related to a kind of measurement apparatus and measuring method of many string vibrating string type sensors calculated based on frequency spectrum, belongs to field of civil engineering, industry is monitored applied to structure safety and Health.It includes trichord vibrating wire sensor, signal switching circuit, boost module, instrument amplifier, frequency overlapped-resistable filter, analog-digital converter, dsp controller；The utility model patent solves the market application limitation for many chord sensors, is broken through in traditional e measurement technology, solves the measurement limitation of existing equipment, can realized either wired, wireless monitor scheme, can not increase hardware cost（Measurement channel quantity, system complexity, volume, power consumption, cable laying etc.）Under the conditions of solve the e measurement technology problems of many string vibrating string type sensors.
Description
Technical field
The utility model is related to a kind of measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum, belongs to building work
Journey field, industry is monitored applied to structure safety and Health.
Background technology
Prior art：Currently for the vibrating string type sensor of many string wires, such as rope meter, many peg power meters, Strain Meter Set
Deng the sensor of vibrating wire principle, it is merely able to a string wire and matches a data acquisition channel, such as in subway foundation pit monitoring, one
Monitoring section usually requires 4 trichord axle power meters or multiple Strain Meter Sets, so may result in a monitoring surface at least need 12 ~
The measuring apparatus of 16 passages, causes cost, power consumption, volume to become big, cabling complexity, is highly detrimental to site operation and monitoring
System is promoted.
Utility model content
The purpose of this utility model is a kind of measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum of offer,
By the signal wire connected mode for improving sensor, it is only necessary to which a Measurement channel carries out signal sampling, then the meter for passing through frequency domain
Calculation method obtains the frequency values of many string wires or multiple vibrating string type sensors, reduces the signal of sensor in once gathering
Cable, the number of channels for reducing collecting device, so as to solve above-mentioned cost, power consumption, volume the problems such as.
The utility model to achieve these goals, is adopted the following technical scheme that：
A kind of measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum, it includes trichord vibrating wire sensor, letter
Number switching circuit, boost module, instrument amplifier, frequency overlapped-resistable filter, analog-digital converter, dsp controller；
Trichord vibrating wire sensor connects signal switching circuit, signal switching circuit connection instrument amplifier, instrument amplifier
Connect frequency overlapped-resistable filter, frequency overlapped-resistable filter connection analog-digital converter, analog-digital converter connection dsp controller, the DSP controls
Device processed is connected by boost module with signal switching circuit；
Three road signals of trichord vibrating wire sensor are simultaneously unified into the signal switching circuit for being connected to harvester all the way.
Three string wire signals of trichord vibrating wire sensor are connected to signal collecting device by sharing a signal wire, and lead to
Cross boost module and induced signal is produced to its exciting, then enter again by frequency overlapped-resistable filter after instrument amplifier is amplified
Row filtering conditioning, the data signal quantified of being sampled finally by analog-digital converter carries out FFT calculating by dsp controller,
And draw the frequency values of many string wires.
Three road signals of trichord vibrating wire sensor are simultaneously unified into the signal switching circuit for being connected to harvester all the way.
Time domain discrete signal that dsp controller is collected to analog-digital converter carries out FFT computings and obtains three in a frequency domain
The frequency values of root string wire.
Boost module carries out exciting by signal switching circuit to trichord vibrating wire sensor.
The induced signal that trichord vibrating wire sensor is produced is switched to instrument amplifier by signal switching circuit.
The utility model principles and methods：Because vibrating string type sensor is the principle by electromagnetic induction, the vibration of string wire
It is converted into exchanging weak electric signal.Have two core components inside it, one is coil, one be two ends tensioning string wire, string wire
It is connected with the stress main body of sensor, when extraneous tested works ess-strain changes, is delivered on string wire and is exactly
The change of string wire tension force, the size of this tension force meets the requirement of classical string formula, i.e. T=4* with the frequency size that string wire vibrates
m*ι2*f2
T-string wire pulling force
M-string wire linear mass
ι-effective calculating length
F-fundamental frequency
Coil has two effects, and one is that the accumulation signal that collecting device is sent is converted into string wire as vibrator
The pulling force of vertical direction, similar to the string that guitar is dialled with hand, can thus excite the intrinsic frequency of current string wire, separately
One function as vibration pickup by be magnetized and damping vibrition string wire produce induced voltage signal be sent to collection
Instrument input.Because the respective vibration of many string wires is separate mechanical movement, belong to the intrinsic frequency of string wire itself, mutually
It is uncorrelated, it is possible to and by same accumulation signal that all string wires are same by the coils from parallel connection of coils of many chord sensors together
Shi Jizhen, so every string wire is vibrated in the intrinsic frequency of each comfortable respective string wire and produces sensing and hand over after all exciting gets up
Flow signal, the induced signal of every string wire is all transmitted using public signal wire, such signal by original individual transmission,
The mode for being changed into linear superposition is transmitted, i.e. x（t）= x1（t）+ x2（t）+ x3（t）+···.Although the time domain letter after superposition
Number it can not be measured by the conventional signal procesing in time domain mode such as means such as the detection of zero-crossing examination, rising edge, pulse width detection
The frequency values of every string wire, but frequency spectrum switch technology can be used（FFT）, collecting device is sampled by analog-digital converter
The time domain discrete superposed signals of multiple sensors be transformed into frequency spectrum, and look for most value-based algorithm to obtain echo signal by sequence
Frequency values, so as to obtain the frequency values of many string wires or multiple sensors by once sampling.The utility model is exactly to use to be somebody's turn to do
Method, while measuring the frequency values of many string wires, on the basis of Acquisition Circuit is not changed, can also be subtracted by an exciting
The cable of sensor is lacked, such as traditional trichord rope meter, totally three coils, using single line as also at least needing if common port
4 core cables are wanted, and use the parallel way of this method, trichord rope meter only needs to both threads, and can realize three
The synchro measure of string, reduces time of measuring.So by the above method, when measuring many string vibrating string type sensors, without rising
Level measuring system increases extra cost.
The beneficial effects of the utility model：
The utility model patent solves the market application limitation for many chord sensors, enterprising in traditional e measurement technology
Row is broken through, and solves the measurement limitation of existing equipment, can realize either wired, wireless monitor scheme, can be not
Increase hardware cost（Measurement channel quantity, system complexity, volume, power consumption, cable laying etc.）Under the conditions of solve many string vibratory strings
The e measurement technology problem of formula sensor.
Brief description of the drawings
Fig. 1 is structural schematic block diagram of the present utility model；
Fig. 2 is FFT frequency domain figures of the present utility model；
Fig. 3 is DSP program flow diagrams of the present utility model.
Embodiment
The utility model is described in detail below in conjunction with the accompanying drawings:
A kind of measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum, it includes trichord vibrating wire sensor 1, letter
Number switching circuit 2, boost module 3, instrument amplifier 4, frequency overlapped-resistable filter 5, analog-digital converter 6, dsp controller 7；
Trichord vibrating wire sensor 1 connects signal switching circuit 2, and signal switching circuit 2 connects instrument amplifier 4, and instrument is put
The big connection of device 4 frequency overlapped-resistable filter 5, the connection analog-digital converter 6 of frequency overlapped-resistable filter 5, the connection dsp controller of analog-digital converter 6
7, the dsp controller 7 is connected by boost module 3 with signal switching circuit 2；
Three road signals of trichord vibrating wire sensor 1 are simultaneously unified into the signal switching circuit 2 for being connected to harvester all the way.
Three string wire signals of trichord vibrating wire sensor 1 are connected to signal collecting device by sharing a signal wire, and
Induced signal is produced to its exciting by boost module 3, then again by anti-aliasing filter after instrument amplifier 4 is amplified
Device 5 is filtered conditioning, and the data signal quantified of being sampled finally by analog-digital converter 6 is carried out by dsp controller 7
FFT is calculated, and draws the frequency values of many string wires.
Three road signals of trichord vibrating wire sensor 1 are simultaneously unified into the signal switching circuit 2 for being connected to harvester all the way.
The time domain discrete signal that dsp controller 7 is collected to analog-digital converter 6 carries out FFT computings and obtained in a frequency domain
The frequency values of three string wires.
Boost module 3 carries out exciting by signal switching circuit 2 to trichord vibrating wire sensor 1.
The induced signal that trichord vibrating wire sensor 1 is produced is switched to instrument amplifier 4 by signal switching circuit 2.
Principle of the present utility model, the utility model principles and methods：Because vibrating string type sensor is by electromagnetic induction
Principle, is converted into the vibration of string wire to exchange weak electric signal.There are two core components inside it, one is coil, and one is two
The stress main body of the string wire of end tensioning, string wire and sensor is connected, when extraneous tested works ess-strain changes,
Be delivered on string wire be exactly string wire tension force change, it is public that the size of this tension force meets classical string with the frequency size that string wire vibrates
The requirement of formula, i.e. T=4*m* ι2*f2
T-string wire pulling force
M-string wire linear mass
ι-effective calculating length
F-fundamental frequency
Coil has two effects, and one is that the accumulation signal that collecting device is sent is converted into string wire as vibrator
The pulling force of vertical direction, similar to the string that guitar is dialled with hand, can thus excite the intrinsic frequency of current string wire, separately
One function as vibration pickup by be magnetized and damping vibrition string wire produce induced voltage signal be sent to collection
Instrument input.Because the respective vibration of many string wires is separate mechanical movement, belong to the intrinsic frequency of string wire itself, mutually
It is uncorrelated, it is possible to and by same accumulation signal that all string wires are same by the coils from parallel connection of coils of many chord sensors together
Shi Jizhen, so every string wire is vibrated in the intrinsic frequency of each comfortable respective string wire and produces sensing and hand over after all exciting gets up
Flow signal, the induced signal of every string wire is all transmitted using public signal wire, such signal by original individual transmission,
The mode for being changed into linear superposition is transmitted, i.e. x（t）= x1（t）+ x2（t）+ x3（t）+···.Although the time domain letter after superposition
Number it can not be measured by the conventional signal procesing in time domain mode such as means such as the detection of zero-crossing examination, rising edge, pulse width detection
The frequency values of every string wire, but frequency spectrum switch technology can be used（FFT）, collecting device is sampled by analog-digital converter
The time domain discrete superposed signals of multiple sensors be transformed into frequency spectrum, and look for most value-based algorithm to obtain echo signal by sequence
Frequency values, so as to obtain the frequency values of many string wires or multiple sensors by once sampling.The utility model is exactly to use to be somebody's turn to do
Method, while measuring the frequency values of many string wires, on the basis of Acquisition Circuit is not changed, can also be subtracted by an exciting
The cable of sensor is lacked, such as traditional trichord rope meter, totally three coils, using single line as also at least needing if common port
4 core cables are wanted, and use the parallel way of this method, trichord rope meter only needs to both threads, and can realize three
The synchro measure of string, reduces time of measuring.So by the above method, when measuring many string vibrating string type sensors, without rising
Level measuring system increases extra cost.
The system specific implementation：Many chord sensors（Generally 3,4,6 strings it is in the majority）, just will be all in production
Coil Same Name of Ends is connected in parallel, and the other end is connected in parallel, the Same Name of Ends of three coils need to be avoided because not being connected together and
Cause counteracting caused by possible signal phase difference, final sensor is exactly externally both threads cable.
The front end of signal chains realizes that exciting voltage and signal acquisition are switched over by a signal switching circuit, presses
According to gatherer process, the output voltage of boost module is first loaded into many chord sensors, and be excited at the same time many by coil respectively
String wire, the superposed signal that many string wires are produced returns to signal switching circuit by signal wire, while dsp controller cuts signal
Change circuit and be switched to instrument amplifier, sensor signal is amplified processing by instrument amplifier, improve signal to noise ratio and be easy to rear end
Processing of circuit.Signal after amplification passes through frequency overlapped-resistable filter again, is traditionally arranged to be the upper limiting frequency of vibrating string type sensor, such as
4000Hz as frequency overlapped-resistable filter cut-off frequency, for filtering out interference and noise outside signal bandwidth.By amplification filter
Signal after ripple carries out sample code finally by analog-digital converter and is transferred to dsp controller.
Dsp controller can realize high-speed hardware Floating-point Computation, beneficial to N values are calculated than larger FFT computings, take into account simultaneously
Power consumption and cost.
During signal transacting inside DSP, if the vibration frequency of two or many string wires close to or it is identical, then in sieve
, it is necessary to consider the situation on the maximum value-based algorithm of choosing, general signal is after amplification, and amplitude is much larger than background noise, can pass through
It is signal or noise to set noise margin voltage range to carry out judgement, if maximum amplitude is less than the string wire quantity of sensor,
So explanation has the string wire vibration frequency of two and the above overlapping, but this on our final data without any influence,
Because what we took is the average value of many string wires.
Accompanying drawing 2 shows the spectrogram of the frequency of three string wire vibrations again after FFT computings inside DSP, can be obvious
The frequency values for seeing three string wires, this frequency values can be obtained by internal algorithm.
Claims (1)
1. a kind of measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum, it is characterised in that：It includes trichord vibratory string
Sensor（1）, signal switching circuit（2）, boost module（3）, instrument amplifier（4）, frequency overlapped-resistable filter（5）, analog-to-digital conversion
Device（6）, dsp controller（7）；
Trichord vibrating wire sensor（1）Connect signal switching circuit（2）, signal switching circuit（2）Connect instrument amplifier（4）, instrument
Table amplifier（4）Connect frequency overlapped-resistable filter（5）, frequency overlapped-resistable filter（5）Connect analog-digital converter（6）, analog-digital converter（6）
Connect dsp controller（7）, the dsp controller（7）Pass through boost module（3）With signal switching circuit（2）Connection；
Trichord vibrating wire sensor（1）Three road signals and be unified into the signal switching circuit for being connected to harvester all the way（2）.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720045897.9U CN206563626U (en) | 2017-01-16 | 2017-01-16 | The measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720045897.9U CN206563626U (en) | 2017-01-16 | 2017-01-16 | The measurement apparatus of many string vibrating string type sensors calculated based on frequency spectrum |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706171A (en) * | 2017-01-16 | 2017-05-24 | 江西飞尚科技有限公司 | Frequency spectrum calculation-based measuring device and measuring method for multi-string vibrating string sensor |
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2017
- 2017-01-16 CN CN201720045897.9U patent/CN206563626U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106706171A (en) * | 2017-01-16 | 2017-05-24 | 江西飞尚科技有限公司 | Frequency spectrum calculation-based measuring device and measuring method for multi-string vibrating string sensor |
| CN106706171B (en) * | 2017-01-16 | 2024-08-06 | 江西飞尚科技有限公司 | Measuring device and measuring method of multi-string vibrating wire type sensor based on frequency spectrum calculation |
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Granted publication date: 20171017 Effective date of abandoning: 20240806 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20171017 Effective date of abandoning: 20240806 |