CN104677483A - Digitized magneto-electric type low-frequency vibration sensor system - Google Patents

Abstract

The invention relates to the field of sensors, particularly relates to a digitized magneto-electric type low-frequency vibration sensor system. The digitized magneto-electric type low-frequency vibration sensor system executes the method comprising the following steps: a seismic detector converts detected vibration velocity signals into analog electric signals; the analog electric signals are performed with high-pass filtering and digitized and then transmitted to an impact signal detecting unit and an impact signal suppressing unit; the impact signal detecting unit and the impact signal suppressing unit judge whether the sensor system generates impact signals according to the differential value of the digitized signals; if the generation of the impact signals is detected, the digitized signals are multiplied with impact signal suppressing gain at the moment to obtain the processed signals; the processed signals are performed with digital integration, digital low-frequency compensation and filtering, and the outputted as analog signals. The digitized magneto-electric type low-frequency vibration sensor system disclosed by the invention effectively inhibits saltation and vibration of the seismic detector output signals due to burst vibration impact; the stability and the accuracy of the whole sensor system can be improved.

Description

A kind of digitized magneto-electric low-frequency shock transducer system

Technical field

The present invention relates to sensor field, particularly relate to a kind of digitized magneto-electric low-frequency shock transducer system.

Background technology

In the operational process of slow-speed of revolution rotating machinery taking turbine-generator units as representative, its main mechanism vibrations frequency lowly can reach 0.4Hz-0.5Hz, and high band main frequency is then not less than 180Hz.Therefore, in the vibration survey towards slow-speed of revolution rotating machinery, the low-frequency vibration signal to being low to moderate 0.4Hz-0.5Hz is needed to measure.The main magneto-electric low frequency vibration speed sensor that adopts is as the measurement sensitive element to the structural vibration of slow-speed of revolution rotating machinery at present.The principal character of the type sensor is for have good response to low frequency (can be low to moderate 0.4Hz) vibration signal.

Traditional magneto-electric low-frequency shock transducer internal main will adopt the process such as adjustment, compensation, filtering of mimic channel settling signal.There is the defect of difficulty of parameter tuning, impact resistance difference in the type sensor, when vibration source exists impact shock signal, sensor can export the vibration abnormal signal of long delay.As shown in Figure 1, the core component of this sensor mainly contains two to the structure of traditional magneto-electric low-frequency shock transducer: the seismoreceiver 1 of responsive vibration velocity signal and the low-frequency compensation of rear end and integrating amplification circuit 2.Wherein seismoreceiver is fixed in sensor housing 3 and sensor base 4, and sensor is fixed in measurand, and along with measurand is vibrated together, wave detector also vibrates with measurand.The low-frequency compensation of rear end low-frequency compensation and integrating amplification circuit settling signal and integration amplify, and finally export analog electric signal.Its principle of work as shown in Figure 2.

Seismoreceiver is the magneto-electric inertial oscillation sensor-based system of a natural frequency at 5Hz-30Hz, and what it exported is the analog electrical signal representing vibration velocity size, and widely use in fields such as seismic monitorings, its structure as shown in Figure 3.This seismoreceiver is made up of magnetic circuit system, inertial mass m, coil and spring-damp system C tetra-parts.Magnetic circuit system is in order to produce constant D.C. magnetic field.Magnetic flux interlinkage in coil and magnetic field produces induction electromotive force, and induction electromotive force and flux change rate (or coil and magnetic field speed of related movement) are directly proportional.The rigidity of quality spring-damp system directly affects the frequency response of sensor, determines the measurement range of sensor.Operationally, when measurand is vibrated, in wave detector operating frequency range, coil and magnet relative motion, cutting magnetic line, produces induced voltage in coil, wave detector output voltage, and this voltage signal is proportional to the vibration speed value of testee.

This seismoreceiver is a second order height way system, and its transport function is as follows:

$y_{\mathrm{jbq}}=\left(s\right)=\frac{s^2}{s^2+{2\mathrm{\ξ}}_2{\mathrm{\ω}}_{g}s+{\mathrm{\ω}}_g^2}---\left(1\right)$

ω _g＝2πf _g(2)

Wherein ξ _gbe the system damping ratio of wave detector, be generally 0.707.And f _gfor the corner frequency of wave detector, due to too low f _grequire larger spring damping and larger mass, more easily cause fatigue and the Problem of Failure of spring damping, be therefore typically chosen in more than 5Hz putting into practice this natural frequency in engineering, be no more than 30Hz.This seismoreceiver amplitude versus frequency characte and phase-frequency characteristic (f as shown in Figure 4 _g=10Hz).Horizontal ordinate is frequency, and ordinate is amplitude and phase place.System output response presents different changes along with the frequency of sine input, and wherein output amplitude is amplitude versus frequency characte with frequency change rule, exports phase angle and forms phase-frequency characteristic with the output phase differential of phase angle and the Changing Pattern of frequency.The meaning of seismoreceiver amplitude versus frequency characte and phase-frequency characteristic is mainly the frequency characteristic quality embodying seismoreceiver.

Direct use seismoreceiver survey frequency compares f _glow vibration signal can produce very large decay, especially far below f _gsignal, therefore, if need to measure 1Hz, even compensating circuit must be adopted lower than f lower than 1Hz _gsignal compensate, low-frequency compensation that Here it is (correction) circuit.

The transport function of this compensating circuit is as follows:

$y^{\′}\left(s\right)=\frac{s^2+{2\mathrm{\ξ}}_{g^{\′}}s+{\mathrm{\ω}}_{g^{\′}}^2}{s^2+{2\mathrm{\ξ}}_m{\mathrm{\ω}}_{m}s+{\mathrm{\ω}}_m^2}---\left(3\right)$

ω _m＝2πf _m(4)

ω _g′＝2πf _g′(5)

Wherein ξ _mthe damping ratio that whole sensing system is wished, and ξ _{g '}the damping ratio of desirable wave detector, f _{g '}for the corner frequency of desirable wave detector, f _mwhole exactly sensing system wishes final low frequency end corner frequency.By adjusting the parameter of compensating circuit, make ξ _{g '}≈ ξ _g, f _{g '}≈ f _g, after this low-frequency compensation circuit, the transport function of whole sensing system is as follows:

Said system is together in series by wave detector and compensating circuit, is a second order height way system, and its amplitude versus frequency characte and phase-frequency characteristic (select f as shown in Figure 5 _m=0.5Hz).

By selecting appropriate ω in compensating circuit kind _m=2 π f _mand ξ _mparameter, just can obtain the low frequency corner frequency of expectation, as Fig. 5 selects f _m=0.5Hz, ξ _m=0.707, make the low frequency end corner frequency of whole sensing system (comprising wave detector and compensating circuit) lowly can reach 0.5Hz, substantially improve the low frequency characteristic of former wave detector.Because seismoreceiver sensitivity output signal is vibration velocity signal, therefore have to pass through integrating circuit, final output vibration displacement signal.Bandpass filter is then for filtering the frequency signal lower than designing requirement and the frequency signal higher than designing requirement.

In traditional magneto-electric low-frequency shock transducer, above-mentioned low-frequency compensation circuit, integral element, bandpass filter all adopt mimic channel to realize.

Traditional analog formula magneto-electric low-frequency shock transducer has following defect:

1) for impact vibration interference signal, there is the problem that overshoot is large, duration of oscillation long, stable recovery is slow in traditional magneto-electric low-frequency shock transducer system.Impact vibration signal derives from touching mill, loosening and the disturbance of power section of rotating machinery.Main impact vibration signal can be summed up as impulse impact signal and step change type impact signal.And magnetoelectric seis inspection sharply becomes suddenly large to above-mentioned impact signal vibration amplitude, then with the intrinsic corner frequency f of wave detector _gfor frequency oscillation exponential damping, damped cycle is by f _gand ξ _gjointly determine.This signal is after follow-up integral element and the process of low-frequency compensation link, and whole sensing system shows as long period, significantly vibrates, and this cycle can by more than 10 seconds, and overshoot amplitude can reach more than 20 times of normal signal.Accidental impact signal can be ignored the impact of measuring, but once impact signal occurs that very frequent, interval time is very in short-term, will continuing to be in transient process to forcing sensing system, showing lasting large period, significantly vibrating, finally cause sensing system to be measured and lost efficacy.

2) difficulty of parameter tuning, due to the ξ in compensating circuit link _{g '}and f _{g '}adjustment be that the capacitance of resistance and electric capacity by changing the related resistors in mimic channel realizes, be limited to the restrictions such as the range of choices of resistance capacitance and precision, can only ξ be accomplished _{g '}close to ξ _g, f _{g '}close to f _g, therefore (6) formula is also just approximate sets up, and therefore the characteristic index of complete sensing measurement system is by ξ _{g '}with ξ _gand f _{g '}with f _gdegree of closeness directly affect.

3) because integral element, low-frequency compensation circuit are all realized by mimic channel, be limited to the complicacy of the realization of mimic channel, its characteristic of filter circuit is difficult to design ideal.

Summary of the invention

For above-mentioned technical matters, the present invention has designed and developed a kind of digitized magneto-electric low-frequency shock transducer system, object is the sudden change that the vibratory impulse of effectively suppression burst causes seismoreceiver to output signal and vibration, improves stability and the accuracy of integral sensors system.On the other hand, adopt software digital mode to realize the adjustment of low-frequency compensation link parameter, improve the matching degree of low-frequency compensation link and seismoreceiver, improve measuring accuracy and the response quality of integral sensors system.Meanwhile, the characteristic of high-order digit bandpass filter Optimal Filter is adopted.

Technical scheme provided by the invention is:

A kind of digitized magneto-electric low-frequency shock transducer system, comprising:

Seismoreceiver changes the vibration velocity signal detected into analog electrical signal;

Described analog electrical signal after high-pass filtering and digitizing, transfer to impact signal detecting unit and impact signal suppresses unit, described impact signal detecting unit and impact signal suppress unit to judge whether produce impact signal in sensing system according to the size of the differential value of digitized signal, if generation impact signal detected, the impact signal then this digitized signal being multiplied by this moment suppresses gain to obtain the signal after processing, and realizes suppressing gain to control to the impact of this digitized signal;

Signal after described process exports with the form of simulating signal after digital integration and digital low-frequency compensation and filtering again;

Wherein, described impact signal suppresses the computing method of gain as follows:

$\left\{\begin{array}{cc}g\left(t\right)=1& \left({t<t}_0\right)\\ g\left(t\right){=e}^{{-\mathrm{\&omega;}}_d(T-t)}& ({t>=t}_0,t{<t}_0+T),\\ g\left(t\right)=1& ({t>t}_0+T)\end{array}\right.$

Wherein, g (t) is impact signal suppression gain function, and t is current time, t ₀for the time of impact signal being detected, ω _dfor damped frequency, T is damped cycle.Through the calculating of this suppression gain, once after impacting, the amplitude periodic oscillation signal that seismoreceiver exports significantly is suppressed, and then enters anomalous integral low-frequency compensation link, can not cause the large overshoot of anomalous integral low-frequency compensation link, long periodic oscillation.

Preferably, in described digitized magneto-electric low-frequency shock transducer system, when the differential value of described digitized signal is greater than 2.4g, then judge to produce impact signal, wherein g=9.8m/s ².

Preferably, in described digitized magneto-electric low-frequency shock transducer system, described seismoreceiver suppresses to be provided with A/D converter between unit with described impact signal detecting unit and impact signal, the analog electrical signal received is converted to digitized signal by described A/D converter, i.e. AD value, this is the basis realizing digital sensor system.The present invention detects whether there is impact signal by the variable quantity following the tracks of input signal corresponding A D value, if the variable quantity of AD value exceedes the upper limit of preset value, then thinks and creates impulse impact or step change type impulsive disturbance signal.

Preferably, in described digitized magneto-electric low-frequency shock transducer system, be provided with every straight amplifier between described seismoreceiver and described A/D converter, the described corner frequency every straight amplifier is 0.4-1.0Hz.This is a high-pass filtering link, in order to remove the DC signal component in seismoreceiver output and the vibration signal lower than 0.4Hz, carries out Linear Amplifer to signal simultaneously.

Preferably, in described digitized magneto-electric low-frequency shock transducer system, the signal after digital integration and digital low-frequency compensation is converted to after simulating signal through D/A converter and exports.

Preferably, in described digitized magneto-electric low-frequency shock transducer system, digital integration and be also connected with digital band-pass filter between digital low-frequency compensation link and described D/A converter, in order to realize Digital High Pass Filter and digital low-pass filtering.

Preferably, in described digitized magneto-electric low-frequency shock transducer system, described digital band-pass filter comprises 4 exponent number word elliptic filter and 16 rank linear-phase filters, the corner frequency of described 4 exponent number word elliptic filter is 0.4Hz-1.0Hz, the corner frequency of described 16 rank linear-phase filters is 180Hz-350Hz, thus optimizes the characteristic of wave filter.

Preferably, in described digitized magneto-electric low-frequency shock transducer system, described D/A is also connected with output signal amplifier, the simulating signal obtained through described D/A exports after described output signal amplifier amplifies again, ensure that the intensity of output signal is enough large, the use of other collection/monitoring equipments can be met.

Preferably, in described digitized magneto-electric low-frequency shock transducer system, described digital integration and digital low-frequency compensation adopt bilinear transformation to carry out sliding-model control to following formula:

$y^{\&prime;}(s)=\frac{s^2+{2\mathrm{\&xi;}}_{g^{\&prime;}}{\mathrm{\&omega;}}_{g^{\&prime;}}s+{\mathrm{\&omega;}}_{g^{\&prime;}}^2}{s^2+{2\mathrm{\&xi;}}_m{\mathrm{\&omega;}}_{m}s+{\mathrm{\&omega;}}_m^2},$

Wherein, y ' (s) is the transport function of compensating circuit, ξ _mthe desirable damping ratio of whole sensing system, ξ _{g '}the damping ratio of desirable wave detector, ω _mthe desirable damped frequency of whole sensing system, ω ' _gbe the damped frequency of desirable wave detector, thus adopt digital form to achieve low-frequency compensation link.

Preferably, in described digitized magneto-electric low-frequency shock transducer system, ω _m=2 π f _m, ω _{g '}=2 π f _{g '}, f _mthe desirable low frequency end corner frequency of whole sensing system, f _{g '}for the corner frequency of desirable wave detector.

In digitized magneto-electric low-frequency shock transducer system of the present invention, digitizing differential detection method is adopted to detect impact shock signal, then adopt the sudden change and vibration of impacting the geophone output signal suppressing link to suppress the vibratory impulse of burst to cause, effectively improve stability and the accuracy of integral sensors system.Utilize A/D converter and D/A that the vibration and shock signal detected is converted into digitized signal simultaneously, carry out a series of digital integration, digital low-frequency compensation and digital band pass filtering link again, achieve the adjustment of digital low-frequency compensation link parameter, improve the matching degree of digital low-frequency compensation link and seismoreceiver, improve measuring accuracy and the response quality of integral sensors system.Adopting 4 exponent number word elliptic filter and 16 rank linear-phase filters to achieve corner frequency is respectively the Digital High Pass Filter of 0.4Hz-1.0Hz and the digital low-pass filtering of 180Hz-350Hz, optimizes the characteristic of wave filter.

Accompanying drawing explanation

Fig. 1 is the structural representation of traditional magneto-electric low-frequency shock transducer;

Fig. 2 is the principle of work schematic diagram of traditional magneto-electric low-frequency shock transducer;

Fig. 3 is the structural representation of seismoreceiver;

Fig. 4 is seismoreceiver f _g=10Hz amplitude versus frequency characte and phase-frequency characteristic schematic diagram;

Fig. 5 is seismoreceiver f _m=0.5Hz amplitude versus frequency characte and phase-frequency characteristic schematic diagram;

Fig. 6 is the principle of work schematic diagram of digitized magneto-electric low-frequency shock transducer system of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to instructions word to make those skilled in the art.

As shown in Figure 6, the invention provides a kind of digitized magneto-electric low-frequency shock transducer system, comprising:

Seismoreceiver changes the vibration velocity signal detected into analog electrical signal; Described analog electrical signal after high-pass filtering and digitizing, transfer to impact signal detecting unit and impact signal suppresses unit, described impact signal detecting unit and impact signal suppress unit to judge whether produce impact signal in sensing system according to the size of the differential value of digitized signal, if generation impact signal detected, then the impact signal this digitized signal being multiplied by this moment suppresses gain to obtain the signal after processing; Signal after described process exports vibration displacement signal with the form of simulating signal again after digital integration and digital low-frequency compensation and filtering.

Wherein, described impact signal suppresses the computing method of gain as follows:

$\left\{\begin{array}{cc}g\left(t\right)=1& \left({t<t}_0\right)\\ g\left(t\right){=e}^{{-\mathrm{\&omega;}}_d(T-t)}& ({t>=t}_0,t{<t}_0+T),\\ g\left(t\right)=1& ({t>t}_0+T)\end{array}\right.$

Wherein, g (t) is impact signal suppression gain function, and t is current time, t ₀for the time of impact signal being detected, ω _dfor damped frequency, T is damped cycle.When the differential value of the described digitized signal detected is greater than 2.4g, then judge to produce impulse impact signal or step change type impulsive disturbance signal, wherein g=9.8m/s ².The impact signal then this digitized signal being multiplied by this moment suppresses gain to obtain the signal after processing.

The analog electrical signal access signal pre-compensating module that seismoreceiver exports, this signal pre-compensating module comprise connect successively every the suppression of straight amplifier, mould/number converter, impact signal detecting unit and impact signal unit, digital integration unit, digital low frequency compensation unit, digital band-pass filter, D/A and output signal amplifier.Through this signal pre-compensating module, the vibration signal within the scope of design frequency, be converted to appropriate voltage/current signals by correct amplification and export, its frequency is the signal of 0.4-1.0Hz.Wherein, this signal pre-compensating module core is the Single Chip Microcomputer (SCM) system of miniaturization, namely the mould connected successively/number converter, impact signal detecting unit and impact signal suppress unit, digital integration unit, digital low frequency compensation unit, digital band-pass filter and D/A, thus the signal detected by seismoreceiver is converted into digital signal processes.

In described digitized magneto-electric low-frequency shock transducer system, described seismoreceiver suppresses to be provided with A/D converter between unit with described impact signal detecting unit and impact signal, and the analog electrical signal received is converted to digitized signal by described A/D converter.Be provided with between described seismoreceiver and described A/D converter every straight amplifier, the described corner frequency every straight amplifier is 0.4-1.0Hz.

In described digitized magneto-electric low-frequency shock transducer system, the signal after digital integration and digital low-frequency compensation is converted to after simulating signal through D/A converter and exports.Digital integration and be also connected with digital band-pass filter between digital low-frequency compensation link and described D/A converter.Described D/A is also connected with output signal amplifier, and the simulating signal obtained through described D/A exports after described output signal amplifier amplifies again.

Described digital band-pass filter comprises 4 exponent number word elliptic filter and 16 rank linear-phase filters, and the corner frequency of described 4 exponent number word elliptic filter is 0.4Hz-1.0Hz, and the corner frequency of described 16 rank linear-phase filters is 180Hz-350Hz.Corner frequency or cutoff frequency, refer to the edge frequency of (numeral) wave filter, Frequency point corresponding time generally to decay to 0.708 times of original input signal amplitude, for edge frequency, therefore just has the saying of 0.4Hz-1.0Hz (-3dB) or 180Hz-350Hz (-3dB).Utilize digitizing technique can realize the low-resistance of corner frequency between 0.4Hz to 1.0Hz (high pass) filtering by the parameter in adjustment signal processing software module.In other words, by the parameter in adjustment software module, just can realize from any one frequency between 0.4Hz-1.0Hz.In low-frequency shock transducer system, acquisition system adopts lower frequency acquisition and longer acquisition time to improve in signal acquiring system the accuracy of low frequency signal, precision usually, but lower frequency acquisition easily causes high-frequency signal aliasing entering signal acquisition system, therefore before signal enters acquisition system, the high-frequency signal that aliasing may be caused to enter low frequency signal is needed to filter, usually selected between 180Hz-350Hz by high band, the frequency higher than this scope will be filtered.

In described digitized magneto-electric low-frequency shock transducer system, digital integration and digital low-frequency compensation link adopt bilinear transformation to carry out sliding-model control to following formula:

$y^{\&prime;}(s)=\frac{s^2+{2\mathrm{\&xi;}}_{g^{\&prime;}}{\mathrm{\&omega;}}_{g^{\&prime;}}s+{\mathrm{\&omega;}}_{g^{\&prime;}}^2}{s^2+{2\mathrm{\&xi;}}_m{\mathrm{\&omega;}}_{m}s+{\mathrm{\&omega;}}_m^2},$

Wherein, y ' (s) is the transport function of compensating circuit, ξ _mthe desirable damping ratio of whole sensing system, ξ _{g '}the damping ratio of desirable wave detector, ω _mthe desirable damped frequency of whole sensing system, ω ' _gthe damped frequency of desirable wave detector, ω _m=2 π f _m, ω _{g '}=2 π f _{g '}, f _mthe desirable low frequency end corner frequency of whole sensing system, f _{g '}for the corner frequency of desirable wave detector.

The present invention utilizes magnetoelectric seis as the basic sensitive element measuring structural vibration, then improves its low frequency characteristic to its output signal through digital low-frequency compensation link, and the low-frequency vibration signal that just can realize being low to moderate 0.4Hz is measured.Traditional analog magneto-electric low-frequency shock transducer adopts mimic channel to realize the process such as whole low-frequency compensations, integration, filtering, but there is the defects such as impact resistance difference, filtering characteristic are poor, difficulty of parameter tuning.

In the present invention, with small-sized single-chip microcomputer for hardware foundation, pass through software engineering, realize digitizing low-frequency compensation link, digitized wave filter, digitized integrator etc., filter characteristic and the simplification facilitating parameter adjustment can be improved, and add in software vibration and shock signal detect and Restrainable algorithms to reduce the impact of impulsive disturbance on sensing system stability, concrete principle is as follows:

For impact vibration signal, derive from touching mill, loosening and the disturbance of power section causes of rotating machinery.Main impact vibration signal can be summed up as impulse impact signal and step change type impact signal.And magnetoelectric seis inspection is that vibration amplitude sharply becomes suddenly large to the response of above-mentioned impact signal, then with the intrinsic corner frequency f of wave detector _gfor frequency oscillation exponential damping, damped cycle is by f _gand ξ _gjointly determine, normal vibration signal then superposes in the signal.Therefore, when after a selected seismoreceiver, f _gand ξ _galso just determine, wave detector is also determined the response model impacted thereupon.

In the present invention, detect whether there is impact signal by the size of the differential value following the tracks of vibration signal.And once generation impact signal be detected, then basis is by f _gand ξ _gdamped cycle and damped expoential, determine signal suppressing model, and all vibration signals all need the suppression gain of being multiplied by the corresponding moment just can carry out the follow-up link such as digital integration and digital compensation.Through the control of this inhibition, once after impacting, the amplitude periodic vibration signal that wave detector exports significantly is suppressed, and then enters integration or compensation tache, can not cause the large overshoot of integral element, compensation tache, long period concussion.

Although embodiment of the present invention are open as above, but it is not restricted to listed in instructions and embodiment utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.

Claims (10)

1. a digitized magneto-electric low-frequency shock transducer system, is characterized in that, comprising:

Seismoreceiver changes the vibration velocity signal detected into analog electrical signal;

Described analog electrical signal after high-pass filtering and digitizing, transfer to impact signal detecting unit and impact signal suppresses unit, described impact signal detecting unit and impact signal suppress unit to judge whether produce impact signal in sensing system according to the size of the differential value of digitized signal, if generation impact signal detected, then the impact signal this digitized signal being multiplied by this moment suppresses gain to obtain the signal after processing;

Signal after described process exports with the form of simulating signal after digital integration and digital low-frequency compensation and filtering again;

Wherein, described impact signal suppresses the computing method of gain as follows:

$\left\{\begin{array}{cc}g\left(t\right)=1& (t<t_0)\\ g\left(t\right)=e^{-{\mathrm{\&omega;}}_d(T-t)}& (t>t_0,t<t_0+T)\\ g\left(t\right)=1& (t>t_0+T)\end{array}\right.,$

Wherein, g (t) is impact signal suppression gain function, and t is current time, t ₀for the time of impact signal being detected, ω _dfor damped frequency, T is damped cycle.

2. digitized magneto-electric low-frequency shock transducer system as claimed in claim 1, is characterized in that, when the differential value of described digitized signal is greater than 2.4g, then judges to produce impact signal, wherein g=9.8m/s ².

3. digitized magneto-electric low-frequency shock transducer system as claimed in claim 2, it is characterized in that, described seismoreceiver suppresses to be provided with A/D converter between unit with described impact signal detecting unit and impact signal, and the analog electrical signal received is converted to digitized signal by described A/D converter.

4. digitized magneto-electric low-frequency shock transducer system as claimed in claim 3, is characterized in that, be provided with every straight amplifier between described seismoreceiver and described A/D converter, and the described corner frequency every straight amplifier is 0.4-1.0Hz.

5. digitized magneto-electric low-frequency shock transducer system as claimed in claim 2, is characterized in that, the signal after digital integration and digital low-frequency compensation is converted to after simulating signal through D/A converter and exports.

6. digitized magneto-electric low-frequency shock transducer system as claimed in claim 5, is characterized in that, digital integration and be also connected with digital band-pass filter between digital low-frequency compensation link and described D/A converter.

7. digitized magneto-electric low-frequency shock transducer system as claimed in claim 6, it is characterized in that, described digital band-pass filter comprises 4 exponent number word elliptic filter and 16 rank linear-phase filters, the corner frequency of described 4 exponent number word elliptic filter is 0.4Hz-1.0Hz, and the corner frequency of described 16 rank linear-phase filters is 180Hz-350Hz.

8. digitized magneto-electric low-frequency shock transducer system as claimed in claim 5, it is characterized in that, described D/A is also connected with output signal amplifier, and the simulating signal obtained through described D/A exports after described output signal amplifier amplifies again.

9. digitized magneto-electric low-frequency shock transducer system as claimed in claim 2, is characterized in that, digital integration and digital low-frequency compensation link adopt bilinear transformation to carry out sliding-model control to following formula:

$y^{\&prime;}\left(s\right)=\frac{s^2+2{\mathrm{\&xi;}}_{g^{\&prime;}}{\mathrm{\&omega;}}_{g^{\&prime;}}s+{\mathrm{\&omega;}}_{g^{\&prime;}}^2}{s^2+{2\mathrm{\&xi;}}_m{\mathrm{\&omega;}}_{m}s+{\mathrm{\&omega;}}_m^2},$

Wherein, y ' (s) is the transport function of compensating circuit, ξ _mthe desirable damping ratio of whole sensing system, ξ _{g '}the damping ratio of desirable wave detector, ω _mthe desirable damped frequency of whole sensing system, ω ' _git is the damped frequency of desirable wave detector.

10. digitized magneto-electric low-frequency shock transducer system as claimed in claim 9, is characterized in that, ω _m=2 π f _m, ω _{g '}=2 π f _{g '}, f _mthe desirable low frequency end corner frequency of whole sensing system, f _{g '}for the corner frequency of desirable wave detector.