CN102288279A - Excitation method and device of vibration string type instrument - Google Patents
Excitation method and device of vibration string type instrument Download PDFInfo
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- CN102288279A CN102288279A CN2011101605440A CN201110160544A CN102288279A CN 102288279 A CN102288279 A CN 102288279A CN 2011101605440 A CN2011101605440 A CN 2011101605440A CN 201110160544 A CN201110160544 A CN 201110160544A CN 102288279 A CN102288279 A CN 102288279A
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Abstract
The invention relates to an excitation method and device of a vibration string type instrument. The method comprises the following steps of: generating SPWM (Sinusoidal Pulse Width Modulation) wave; filtering the generated SPWM wave through a filter circuit to obtain a sinusoidal waveform signal; then, applying the sinusoidal waveform signal at two ends of a frequency measurement coil in the vibration string type instrument; generating alternating electromagnetic force under the action of a permanent magnet; and driving steel strings to generate resonance. The SPWM waveform excitation signal, the pulse width of which is regularly changed according to sinusoidal waveforms, is generated by using the method. The precise control capability of the excitation signal is improved. Various limitations in the traditional excitation method using pulse square wave are solved.
Description
Technical field
The present invention relates to the health monitoring technical field of Geotechnical Engineering, particularly be applied to the excitation method and the device of the type vibration wire instrument in the safety monitoring instrument of Geotechnical Engineering.
Background technology
In safety monitoring, adopt the physical quantitys such as ess-strain, temperature, seam aperture, seepage and distortion of safety monitoring instrument monitoring Geotechnical Engineerings such as type vibration wire (or claiming steel chord type) instrument usually, in order to the safety of analysis and judgement Geotechnical Engineering to Geotechnical Engineering.
Type vibration wire instrument (or claim vibrating string type sensor) by two ends fix, the string wire of homogeneous forms.String wire length is L, and in perception external influence power F (can be ess-strain, temperature, seam aperture, seepage and the distortion etc. of Geotechnical Engineering), string wire can produce the stretcher strain of Δ L, in elastic range, considers the influence of temperature T simultaneously,
Δ T=T-T wherein
0, α is a linear expansion coefficient, T
0, α, K be known permanent number.The mechanical vibration natural frequency f of string wire can obtain by following formula:
Wherein E is the elastic modulus of string wire, ρ
vBe the density of string wire, λ is the Poisson's coefficient of string wire material, and these are permanent number.Above-mentioned two formula are put in order, eliminated
This common variable, drawing F is definite function of f and T, just can realize the measurement of F by measurement f and T.As seen, the vibration natural frequency parameter f of string wire is the most key measurement factor.
The frequency parameter f that measures string wire at present adopts the method for exciting pick-up usually, string wire is arranged in the magnetic field of frequency measurement coil and permanent magnet formation, by excitation method string wire is shaken, the string wire of resonance is made cutting magnetic line movement in magnetic field, and pick up in the frequency measurement coil because the frequency of the faint electromotive force that the mechanical vibration of string wire produce, and then obtain the natural frequency of string wire by the pick-up method.Wherein, adopting which kind of excitation method that string wire is shaken is the frequency parameter f major issue to be solved of measuring string wire.
The method of traditional exciting string wire, by shown in Figure 1, (this frequency can be the natural frequency initial value of sensor to single-chip processor i/o mouth in the microsystem according to certain frequency, also can be last measured value) produce the accumulation signal of pulse square wave, the accumulation signal waveform of this pulse square wave as shown in Figure 2, after this accumulation signal amplified by photoelectric isolating circuit and basic power amplifier, the exciting electric current flow through the frequency measurement coil, alternating magnetic field excitation string wire 1 vibration that the exciting electric current produces.The pulsating current frequency that single coil excitement passes through is regulated by microsystem.As shown in Figure 2, the exciting waveform that traditional excitation method produces is produced by digital display circuit, is that amplitude is certain, the square wave of frequency adjustable, and square width is linear change along with the variation of frequency.The exciting of this square wave has following deficiency: (1) is because square wave harmonic components more complicated is introduced harmonic wave when causing exciting, as the bigger frequency tripling that exerts an influence, and is unfavorable to the exciting of string wire, causes reliably starting of oscillation of string wire 1, reaches resonant condition rapidly; (2) for a kind of instrument, the amplitude that produces pulse square wave is certain, cause this method to some exciting relatively difficulty instrument or have the problem that can not make it reliable starting of oscillation or excessive exciting than the instrument that is easier to starting of oscillation.
Summary of the invention
The exciting square wave introducing harmonic wave that the present invention is directed to the excitation method generation of existing type vibration wire instrument causes the reliably problem of starting of oscillation of string wire, a kind of excitation method of novel type vibration wire instrument has been proposed, the harmonic wave of this method output waveform is few, has good starting of oscillation effect.The present invention also provides a kind of exciting device of type vibration wire instrument.
Technical scheme of the present invention is as follows:
A kind of excitation method of type vibration wire instrument, it is characterized in that, at first generate the SPWM ripple, again the SPWM ripple that generates is carried out filtering by filtering circuit and obtain sine wave-shaped signal, then described sine wave-shaped signal is applied to the frequency measurement coil two ends in the type vibration wire instrument, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance.
Described SPWM ripple is by DSP or CPLD or FPGA or single-chip microcomputer generation.
Described SPWM ripple produces by DSP, and the SPWM ripple that DSP is generated carries out the photoelectricity isolation through photoelectric isolating circuit with undesired signal earlier, and the SPWM ripple after again photoelectricity being isolated carries out filtering by filtering circuit.
The sine wave-shaped signal that obtains after the filtering is carried out amplitude adjusted by amplitude control circuit.
Sine wave-shaped signal after the amplitude adjusted is carried out power amplification to have driving force, and the sine wave-shaped signal after the power amplification is applied to frequency measurement coil two ends;
And/or described amplitude control circuit comprises serial D/A converter, operational amplifier and multiplier, the reference voltage that described serial D/A converter produces behind operational amplifier as one road input signal of multiplier, another road input signal of described multiplier is a sine wave-shaped signal, the sine wave-shaped signal after described multiplier output amplitude is regulated;
And/or described filtering circuit is three rank Butterworth LPF.
A kind of exciting device of type vibration wire instrument, it is characterized in that, comprise the SPWM wave producer that connects successively, filtering circuit and accumulation signal on-off circuit, described SPWM wave producer generates the SPWM ripple and it is inputed to filtering circuit, described filtering circuit carries out filtering and obtains sine wave-shaped signal, the output of described filtering circuit is connected to the frequency measurement coil two ends in the type vibration wire instrument, thereby described sine wave-shaped signal is applied to frequency measurement coil two ends, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance, described accumulation signal on-off circuit is realized the switch of sine wave-shaped signal.
Described SPWM wave producer is DSP or CPLD or FPGA or single-chip microcomputer.
Described SPWM wave producer is DSP, described DSP is connected to filtering circuit by photoelectric isolating circuit, the SPWM ripple that the SPWM wave producer generates inputs to photoelectric isolating circuit isolates undesired signal is carried out photoelectricity, and the SPWM ripple of photoelectric isolating circuit output inputs to filtering circuit and carries out filtering to obtain sine wave-shaped signal.
Also comprise amplitude control circuit, the input end of described amplitude control circuit links to each other with the output terminal of filtering circuit, the sine wave-shaped signal of described filtering circuit output inputs to amplitude control circuit to carry out wave-shape amplitude and regulates, thereby the output terminal of described amplitude control circuit links to each other with frequency measurement coil two ends the sine wave-shaped signal after the amplitude adjusted is applied to frequency measurement coil two ends.
Also comprise power amplification circuit, the input end of described power amplification circuit links to each other with the output terminal of amplitude control circuit, the sine wave-shaped signal of described power amplification circuit after with amplitude adjusted carries out power amplification having driving force, thereby the output terminal of described power amplification circuit links to each other with frequency measurement coil two ends the sine wave-shaped signal after the power amplification is applied to frequency measurement coil two ends;
And/or described amplitude control circuit comprises serial D/A converter, operational amplifier and multiplier, the reference voltage that described serial D/A converter produces behind operational amplifier as one road input signal of multiplier, another road input signal of described multiplier is a sine wave-shaped signal, the sine wave-shaped signal after described multiplier output amplitude is regulated;
And/or described filtering circuit is three rank Butterworth LPF.
Technique effect of the present invention is as follows:
The excitation method of type vibration wire instrument provided by the invention, this method is by generating the SPWM ripple, again it is carried out filtering by filtering circuit and obtain sine wave-shaped signal, then described sine wave-shaped signal is applied to the frequency measurement coil two ends of type vibration wire instrument, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance.This method has changed the method that traditional digital display circuit produces the square wave exciting string wire of pulse width linear change, SPWM (Sinusoidal Pulse Width Modulation, the sinusoid pulse width modulation modulation) technology is applied to produce the exciting of string wire, realize the online adjusting of the exciting waveform of SPWM ripple, the SPWM ripple has the characteristic that pulse width changes according to sinusoidal rule, the harmonic wave of its output waveform is few, behind filtering circuit, can disturb by harmonic carcellation, form the single sine wave of frequency spectrum, solved in the frequency spectrum of the pulse square wave that the excitation method of existing type vibration wire instrument produces and contained harmonic wave, cause reliably starting of oscillation and contain the problem of clutter of string wire, the sine wave-shaped signal that the present invention is obtained, it is applied to the frequency measurement coil two ends of type vibration wire instrument, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance, make reliably starting of oscillation of string wire, improved the accurate control ability of accumulation signal.
The SPWM ripple that excitation method of the present invention generates can be by DSP or CPLD or FPGA or single-chip microcomputer generation, adopt High Performance DSP (Digital Signal Processing, digital signal processor), fully use its embedded PWM module and its processing power at a high speed, produce the SPWM ripple by DSP, carry out filtering through filtering circuit and obtain sine wave-shaped signal, be applied to the frequency measurement coil two ends of unicoil type vibration wire instrument, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance.Utilize CPLD (Complex Programmable Logic Device, CPLD) and FPGA (Field Programmable Gate Array, field programmable gate array) all can produce the digital SPWM ripple, generate the SPWM ripple based on single-chip microcomputer, this mode control circuit is simple and reliable and cost is low, and it is little to be subjected to external interference.The SPWM wave impulse width that above-mentioned each mode generates changes according to sinusoidal rule, has the few characteristic of output waveform harmonic wave, has good starting of oscillation effect, has solved the limitation that traditional excitation method directly adopts pulse square wave and brought.
In excitation method of the present invention, set up photoelectric isolating circuit and carry out the photoelectricity isolation step, the interfering channel introduced in the SPWM ripple can be cut off, interference source and the part that is subject to disturb are isolated from the circuit; SPWM ripple after the photoelectricity isolation is carried out filtering by filtering circuit, the sine wave-shaped signal that the SPWM ripple obtains after filtering carries out amplitude adjusted by amplitude control circuit, this method is to the relatively more difficult instrument of some exciting, under the control of DSP, can improve the exciting sinusoidal waveform amplitude that the SPWM waveform transforms adaptively, the situation of avoiding the instrument unexcited to shake; Otherwise contrast is easier to the instrument exciting of exciting, can adaptive reduction exciting sinusoidal waveform amplitude, avoid the problem of excessive exciting, and realized the online adjusting of SPWM wave amplitude, improved the reliability and stability of type vibration wire instrument exciting.
Sine wave-shaped signal after the amplitude adjusted is carried out power amplification, make it to have suitable driving force, can drive sine wave-shaped signal better and be applied to frequency measurement coil two ends, improved the starting of oscillation performance.
The exciting device of type vibration wire instrument provided by the invention, comprise the SPWM wave producer, filtering circuit and the accumulation signal on-off circuit that connect successively, generate the SPWM ripple and it is inputed to filtering circuit by the SPWM wave producer, filtering circuit carries out filtering and obtains sine wave-shaped signal, the output of filtering circuit is connected to the frequency measurement coil two ends of type vibration wire instrument, thereby described sine wave-shaped signal is applied to frequency measurement coil two ends, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance.The nonadjustable square-wave signal of pulse width linear change, amplitude that this device of the present invention is more traditional based on the generation of microprocessor I/O mouth, the SPWM ripple that is generated, can obtain the sine wave exciting signal that frequency spectrum is more single, amplitude can be passed through the online adjusting of amplitude control circuit, improved the accurate control ability of accumulation signal, solved traditional excitation method and adopted the various limitation that pulse square wave produced.
Description of drawings
Fig. 1 is the implementation method synoptic diagram of traditional exciting string wire.
Fig. 2 is traditional frequency sweep accumulation signal oscillogram.
Fig. 3 is the excitation method preferred flow charts of type vibration wire instrument of the present invention.
Fig. 4 produces the main program flow chart of SPWM ripple for DSP.
Fig. 5 produces the interrupt routine process flow diagram of SPWM ripple for DSP.
Fig. 6 a, 6b and 6c are for generating the oscillogram of SPWM wave excitation signal.
Fig. 7 is the exciting device preferred structure synoptic diagram of type vibration wire instrument of the present invention.
Embodiment
The present invention will be described below in conjunction with accompanying drawing.
Fig. 3 is the method flow diagram of the SPWM wave excitation signal of realizing based on DSP of type vibration wire instrument of the present invention, and this method comprises the steps:
A, employing High Performance DSP are fully used the embedded PWM module of DSP and its processing power at a high speed, produce the SPWM ripple by DSP; The carrier frequency of SPWM is produced according to excited frequency by DSP, and the pulse width that sinusoidal rule changes is calculated generation in real time by DSP; Wherein, the main program flow chart of DSP generation SPWM ripple as shown in Figure 4, the interrupt routine process flow diagram as shown in Figure 5, in main program flow chart, DSP need in the PWM module that initialization comprises in it PWM pin, system control register, be provided with that timer interrupts, task manager (comprising period register, comparand register, counter register, control register etc.), the sine table that needs generation is set, and global interrupt enables; In the interrupt routine process flow diagram, comprise the set of timer underflow interrupt identification, upgrade comparand register, remove interrupt mask flag, remove and interrupt enabler flags, response is set interrupts on the same group, open the global interrupt step; In addition, DSP is the master controller of exciting part, also is simultaneously the master controller of pick-up part, mainly is the generation of SPWM ripple and the coordination and the control of exciting and pick-up process in the exciting part;
The principle that produces the SPWM ripple can be based on equivalent area method, symmetric regular-sampled method, asymmetric regular sampling and natural sampling method.Wherein, natural sampling method principle is simple and directly perceived, and possesses very definite number reason foundation, and versatility and operability are also very strong.Fig. 6 a, 6b and 6c are for generating the oscillogram of SPWM wave excitation signal based on natural sampling method: when the triangular carrier of sinusoidal modulation wave and several constant amplitudes meets on time shaft, triangular carrier offset of sinusoidal modulating wave is sampled, and make the zero point of sinusoidal modulation wave and the peak dot of triangular carrier be in same-phase, shown in Fig. 6 a; The intersection point p1...p10 of gained is expressed as phasing degree and the corresponding instantaneous amplitude on the temporal meaning, and segment table shows that with positive string section be the rect.p. group who effectively exports between the phase region between intersection point, and the SPWM ripple that is generation is shown in Fig. 6 b; The pulse width of this SPWM ripple changes according to sinusoidal rule, and SPWM involves its waveform that changes by sinusoidal rule shown in Fig. 6 c.Certainly, also can produce the SPWM ripple according to other principles such as symmetric regular-sampled methods.DSP as shown in Figure 4 and Figure 5 produces in the main program flow chart and interrupt routine process flow diagram of SPWM ripple, can be understood as to be based on the SPWM ripple that the symmetric regular-sampled method realizes.
The SPWM ripple that B, DSP generate carries out photoelectricity through photoelectric isolating circuit with undesired signal isolates, and promptly optical coupling isolation circuit is realized the electrical isolation of DSP numerical portion and simulation part;
C, filter the higher hamonic wave of SPWM ripple, obtain sine wave-shaped signal by three rank Butterworth LPF;
D, realize the amplitude adjusted of sine wave-shaped signal by amplitude control circuit, this amplitude control circuit comprises serial D/A converter, operational amplifier and multiplier, the reference voltage that serial D/A converter produces behind operational amplifier as one road input signal of multiplier, another road input signal of described multiplier is a sine wave-shaped signal, described multiplier is to the two-way input simulating signal back sine wave output shape signal that multiplies each other, thereby realized the amplitude adjusted of sine wave output shape;
E, the sine wave-shaped signal after the amplitude adjusted is carried out power amplification, make it have suitable driving force, sine wave-shaped signal after the power amplification is sent into single coil excitement, be about to it and be applied to the frequency measurement coil two ends of type vibration wire instrument, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance.
The invention still further relates to a kind of exciting device of novel type vibration wire instrument, its preferred structure synoptic diagram as shown in Figure 7, comprise the digital signal processor (to call DSP in the following text), photoelectric isolating circuit, three rank Butterworth LPF, amplitude control circuit and the power amplification circuit that connect successively, also comprise the accumulation signal on-off circuit.Generate the SPWM ripple by DSP, the Wave data of this SPWM ripple inputs to photoelectric isolating circuit, undesired signal is carried out photoelectricity isolates, SPWM ripple output after again photoelectricity being isolated, SPWM ripple after photoelectricity is isolated inputs to three rank Butterworth LPF and carries out filtering, filter out the higher hamonic wave of SPWM ripple, and obtain sine wave-shaped signal output, the output of three rank Butterworth LPF is connected to the input end of amplitude control circuit, amplitude control circuit carries out the sine wave-shaped signal amplitude adjusted, be specially: amplitude control circuit comprises serial D/A converter, operational amplifier and multiplier, the reference voltage that described serial D/A converter produces behind operational amplifier as one road input signal of multiplier, another road input signal of described multiplier is a sine wave-shaped signal, described multiplier can produce the excitation waveform of corresponding amplitude as required with the two paths of signals sine wave-shaped signal of back output amplitude after regulating that multiply each other; The output terminal of amplitude control circuit is connected to the input end of power amplification circuit, and the sine wave-shaped signal of power amplification circuit after to amplitude adjusted carries out power amplification, so that suitable driving force to be provided; The output terminal of power amplification circuit links to each other with frequency measurement coil two ends in the type vibration wire instrument, thereby the sine wave-shaped signal after the power amplification is applied to A, the B two ends of frequency measurement coil 2, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance.The sinusoidal wave accumulation signal (being sine wave-shaped signal) that this exciting device can obtain that frequency spectrum is more single, amplitude can online adjusting carries out follow-up amplification shaping and the measurement of finishing frequency behind the exciting.
The signal switching circuit that shakes of this device of the present invention can be arranged between power amplification circuit and the frequency measurement coil, or is arranged between amplitude control circuit and the power amplification circuit, and the accumulation signal on-off circuit is in order to realize the switch of accumulation signal.
The excitation method of type vibration wire instrument of the present invention and device all are applicable to the various type vibration wire instruments of exciting, as exciting unicoil type vibration wire instrument, and exciting twin coil type vibration wire instrument etc.What need supplementary notes is that for twin coil type vibration wire instrument, because its frequency measurement coil comprises single coil excitement and pick-up coil, the described frequency measurement coil of instructions is real to be single coil excitement, is about to final sine wave-shaped signal and is applied to the single coil excitement two ends.
Should be pointed out that the above embodiment can make those skilled in the art more fully understand the invention, but do not limit the present invention in any way creation.Therefore; although this instructions has been described in detail the invention with reference to accompanying drawing; but; those skilled in the art are to be understood that; still can make amendment or be equal to replacement the invention; in a word, all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection domain of the invention patent.
Claims (10)
1. the excitation method of a type vibration wire instrument, it is characterized in that, at first generate the SPWM ripple, again the SPWM ripple that generates is carried out filtering by filtering circuit and obtain sine wave-shaped signal, then described sine wave-shaped signal is applied to the frequency measurement coil two ends in the type vibration wire instrument, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance.
2. the excitation method of type vibration wire instrument according to claim 1 is characterized in that, described SPWM ripple is by DSP or CPLD or FPGA or single-chip microcomputer generation.
3. the excitation method of type vibration wire instrument according to claim 2, it is characterized in that, described SPWM ripple produces by DSP, and the SPWM ripple that DSP is generated carries out the photoelectricity isolation through photoelectric isolating circuit with undesired signal earlier, and the SPWM ripple after again photoelectricity being isolated carries out filtering by filtering circuit.
4. the excitation method of type vibration wire instrument according to claim 3 is characterized in that, the sine wave-shaped signal that obtains after the filtering is carried out amplitude adjusted by amplitude control circuit.
5. the excitation method of type vibration wire instrument according to claim 4 is characterized in that, the sine wave-shaped signal after the amplitude adjusted is carried out power amplification to have driving force, and the sine wave-shaped signal after the power amplification is applied to frequency measurement coil two ends;
And/or described amplitude control circuit comprises serial D/A converter, operational amplifier and multiplier, the reference voltage that described serial D/A converter produces behind operational amplifier as one road input signal of multiplier, another road input signal of described multiplier is a sine wave-shaped signal, the sine wave-shaped signal after described multiplier output amplitude is regulated;
And/or described filtering circuit is three rank Butterworth LPF.
6. the exciting device of a type vibration wire instrument, it is characterized in that, comprise the SPWM wave producer that connects successively, filtering circuit and accumulation signal on-off circuit, described SPWM wave producer generates the SPWM ripple and it is inputed to filtering circuit, described filtering circuit carries out filtering and obtains sine wave-shaped signal, the output of described filtering circuit is connected to the frequency measurement coil two ends in the type vibration wire instrument, thereby described sine wave-shaped signal is applied to frequency measurement coil two ends, under the effect of permanent magnet, produce alternating electromagnetic force, drive string wire and produce resonance, described accumulation signal on-off circuit is realized the switch of sine wave-shaped signal.
7. the exciting device of type vibration wire instrument according to claim 6 is characterized in that, described SPWM wave producer is DSP or CPLD or FPGA or single-chip microcomputer.
8. the exciting device of type vibration wire instrument according to claim 7, it is characterized in that, described SPWM wave producer is DSP, described DSP is connected to filtering circuit by photoelectric isolating circuit, the SPWM ripple that the SPWM wave producer generates inputs to photoelectric isolating circuit isolates undesired signal is carried out photoelectricity, and the SPWM ripple of photoelectric isolating circuit output inputs to filtering circuit and carries out filtering to obtain sine wave-shaped signal.
9. the exciting device of type vibration wire instrument according to claim 8, it is characterized in that, also comprise amplitude control circuit, the input end of described amplitude control circuit links to each other with the output terminal of filtering circuit, the sine wave-shaped signal of described filtering circuit output inputs to amplitude control circuit to carry out wave-shape amplitude and regulates, thereby the output terminal of described amplitude control circuit links to each other with frequency measurement coil two ends the sine wave-shaped signal after the amplitude adjusted is applied to frequency measurement coil two ends.
10. the exciting device of type vibration wire instrument according to claim 9, it is characterized in that, also comprise power amplification circuit, the input end of described power amplification circuit links to each other with the output terminal of amplitude control circuit, the sine wave-shaped signal of described power amplification circuit after with amplitude adjusted carries out power amplification having driving force, thereby the output terminal of described power amplification circuit links to each other with frequency measurement coil two ends the sine wave-shaped signal after the power amplification is applied to frequency measurement coil two ends;
And/or described amplitude control circuit comprises serial D/A converter, operational amplifier and multiplier, the reference voltage that described serial D/A converter produces behind operational amplifier as one road input signal of multiplier, another road input signal of described multiplier is a sine wave-shaped signal, the sine wave-shaped signal after described multiplier output amplitude is regulated;
And/or described filtering circuit is three rank Butterworth LPF.
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| CN103968973A (en) * | 2014-05-23 | 2014-08-06 | 重庆建工第三建设有限责任公司 | Shock excitation method for vibrating wire sensor |
| CN105628185A (en) * | 2015-12-28 | 2016-06-01 | 江西飞尚科技有限公司 | Vibration wire sensor triple-frequency shielding method |
| CN106225656A (en) * | 2016-08-01 | 2016-12-14 | 长安大学 | The excitation detection device of a kind of low-power consumption vibration wire sensor and excitation detection method |
| CN106289034A (en) * | 2016-08-01 | 2017-01-04 | 长安大学 | A kind of low-power consumption vibration wire sensor and excitation detection method thereof |
| CN106647430A (en) * | 2016-08-17 | 2017-05-10 | 江西飞尚科技有限公司 | Monopulse excitation vibratory string sensor-based vibration exciting method |
| CN109639143A (en) * | 2018-11-29 | 2019-04-16 | 天津大学 | Electromagnetic force exciting device |
| CN111207876A (en) * | 2020-01-13 | 2020-05-29 | 江苏南水科技有限公司 | Intelligent excitation and vibration pickup method for embedded vibrating wire type osmometer |
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Cited By (9)
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| CN103968973A (en) * | 2014-05-23 | 2014-08-06 | 重庆建工第三建设有限责任公司 | Shock excitation method for vibrating wire sensor |
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| CN106225656A (en) * | 2016-08-01 | 2016-12-14 | 长安大学 | The excitation detection device of a kind of low-power consumption vibration wire sensor and excitation detection method |
| CN106289034A (en) * | 2016-08-01 | 2017-01-04 | 长安大学 | A kind of low-power consumption vibration wire sensor and excitation detection method thereof |
| CN106647430A (en) * | 2016-08-17 | 2017-05-10 | 江西飞尚科技有限公司 | Monopulse excitation vibratory string sensor-based vibration exciting method |
| CN109639143A (en) * | 2018-11-29 | 2019-04-16 | 天津大学 | Electromagnetic force exciting device |
| CN111207876A (en) * | 2020-01-13 | 2020-05-29 | 江苏南水科技有限公司 | Intelligent excitation and vibration pickup method for embedded vibrating wire type osmometer |
| CN111207876B (en) * | 2020-01-13 | 2021-07-02 | 江苏南水科技有限公司 | Intelligent excitation and vibration pickup method for embedded vibrating wire type osmometer |
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Application publication date: 20111221 |