CN100487492C - Amplitude weighting circuit excitated by phased array in acoustic wave logging - Google Patents
Amplitude weighting circuit excitated by phased array in acoustic wave logging Download PDFInfo
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- CN100487492C CN100487492C CNB2006100986764A CN200610098676A CN100487492C CN 100487492 C CN100487492 C CN 100487492C CN B2006100986764 A CNB2006100986764 A CN B2006100986764A CN 200610098676 A CN200610098676 A CN 200610098676A CN 100487492 C CN100487492 C CN 100487492C
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Abstract
An amplitude weighting circuit implementing orientation sound wave well logging phased array motivation in applied globe physics field consists of an electric swift and a digital signal processor; a zero passage detecting circuit and a peak value detecting circuit are connected with a power source; output controlling logic signals mark the starting point of charging time sequence; the peak value detecting circuit acquires semi-wave peak value data to determine each charging time; a charging current limiting resistance is connected with a power source short contact switch and more than one storage circuit; a charging switch and a discharge switch are controlled by the digital signal processor. The invention acquires different amplitude weighting effects on a storage capacitance by controlling charging time, avoids exigency of the performance of high voltage direct current power supply wave filter voltage stabilizing element and solves the problem of the amplitude weighting motivation of a sound wave well logging phased array sound wave energy converter implemented in the high temperature and narrow space underground.
Description
Technical field
The present invention relates to sonic prospecting between orientation acoustic logging, bearing reflective sound wave imaging logging and orientation well, is the amplitude weighting circuit of phased array in acoustic wave logging excitation that is used for the column transducer array of a plurality of annulus subarrays combination.
Background technology
When carrying out between orientation acoustic logging, bearing reflective sound wave imaging logging and orientation well sonic prospecting in the applied geophysics field, use the three-dimensional sound field of the column transducer array radiation in the other stratum of well that forms by a plurality of annulus subarray combinations, thereby the reflection wave that obtains different directions is judged the other and nearly well space of well stratigraphic structure.The phased array acoustic wave transducer can produce directed high-power acoustic irradiation.The phased array acoustic wave transducer is made up of the normally element of transducers of sheet up to a hundred, 4 * 24 arrays of being made up of four circular array of typical structure.When adopting 90 degree covering of the fan emissions, circular array needs 24 independently pulse excitation sources altogether.When well logging, encourage several chosen in array transducer units by specific order respectively with the interval and with different intensity as required, thereby produce the acoustic irradiation of required directive property and intensity.The pulse excitation source of these varying strengths is size (weighting coefficient) decisions by the charging end of a period voltage of the storage capacitor of each pulse independent source, promptly so-called " amplitude weighting ".
Because the acoustic logging subsurface equipment will be worked under rugged surroundings such as 155～175 ℃ of high temperature and the diameter 70mm left and right sides, space tubular small space, and the dynamic range of pumping signal is usually greater than 120dB, Electro Magnetic Compatibility to system has very high requirement, so, the device performance of regular tap power supply is difficult to adapt to the down-hole hot environment, the high power devices such as electronic switch that high-voltage great-current is used can not use the adiabatic heat-insulation device, are difficult to realize excitation phased array acoustic wave transducer amplitude weighting circuit.
In addition, general 50～60Hz the Alternating Current Power Supply that adopts of downhole logging instrument device, to the control of independently charging of each storage capacitor in the exciting circuit, usually to adopt filter regulator circuit, employed filter capacitor must have and is not less than 680 μ F/450V/175 ℃ and the technical indicator of reliably working continuously in the filter regulator circuit, the polarity high-voltage capacitance that has of aluminum current, tantalum medium is difficult to be competent at, and nonpolarity High Temperature High Pressure electric capacity (adopting the electric capacity of media such as teflon, polyimide and polyphenylene sulfide) not only volume is big and the monomer capacity is too little.
At present, the phase controlled sound wave that is applicable to oil well logging down-hole hot environment is not seen open report with the amplitude weighting circuit.
Summary of the invention
The purpose of this invention is to provide a kind of amplitude weighting circuit of phased array in acoustic wave logging excitation that can realize the acoustic wave transducer of phased array at down-hole high temperature and small space.
The present invention adopts following technical scheme:
A kind of amplitude weighting circuit of phased array in acoustic wave logging excitation, become by step-up transformer, full-bridge rectification, electronic switch, zero cross detection circuit, peak detection circuit, tank circuit, bank of digital signal processors, zero cross detection circuit is connected with direct supply with peak detection circuit, zero cross detection circuit output control logic signal is to the starting point of digital signal processor mark charging sequential, the peak detection circuit output terminal is delivered to the collection of simulant signal input end of digital signal processor, obtains the half-wave peak-data to determine each time duration of charging; Charging current limiter resistance is connected with the full-bridge rectification direct supply, and the other end connects power supply short circuit switch and more than one tank circuit, and the charge switch and the discharge switch of tank circuit pass through DSP CONTROL.
The present invention also adopts following technical scheme:
Described electronic switch S connects level translator U by V-type groove MOS (metal-oxide-semiconductor) memory (VMOS) and forms, control end and switch terminals adopt form altogether, are finished the positive high voltage switch terminals P of drain electrode and the break-make of G by the TTL input end C control N raceway groove VMOS power device of level translator U.
Tank circuit is by rectifying device D, storage capacitor C, and charge switch Sc is composed in series, and is connected with discharge switch Sd on storage capacitor C, and rectifying device D can only discharge storage capacitor C by Vh to pulse-excited circuit.
Described power supply short circuit switch S p makes high direct voltage by the temporary transient short circuit of Rr quilt by DSP CONTROL Sp before excitation.
The temporary transient short circuit time of described power supply short circuit switch S p is less than 500 μ s.
Described charging current limiter resistance R r restriction maximum charging current is 0.8-1.2A.
Described peak detection circuit PKC retention time constant is greater than 0.1s.
The positive high voltage signal conduction of described VMOS drain electrode and turn-off time are all less than 5 μ s.
Described VMOS power device adopts the IRF460 or the IRF460P of 500V/20A/300W magnitude, and level translator U adopts CD4504BF.
Described digital signal processor DSP adopts SM320LF2407APGEMEP or TMS320F2812PGFQ.
The present invention obtains different amplitude weighting effects by the control duration of charging on storage capacitor, avoid overcritical to high voltage direct current power supply filtering voltage regulation element function, solved the problem of the amplitude weighting excitation that under down-hole high temperature and small space condition, realizes the phased array in acoustic wave logging acoustic wave transducer.
Description of drawings
Description of drawings of the present invention is as follows:
Fig. 1 (a) is for having the VMOS gating circuit switch synoptic diagram of level shifting circuit;
Fig. 1 (b) is for having the VMOS gating switch equivalent indicia figure of level shifting circuit;
Fig. 2 phased array excitation amplitude weighting circuit diagram.
Specific embodiments with
Under be described with reference to the accompanying drawings the present invention.
The present invention directly adopts full-wave rectification output, control as required a series of storage capacitor chargings, adopt step-up transformer T, the full-bridge rectification BR that fast recovery diode is formed forms electric power system, by electronic switch S, tank circuit, compositions such as digital signal processor, zero cross detection circuit ZCC (ZeroCross Checker) and peak detection circuit PKC (Peak value Checke, r) be connected the charge starting point of sequential of the governor circuit mark that zero cross detection circuit ZCC is made up of ZCC.O end output control logic signalisation sound wave emissions controller digital signal processor DSP (Digital Signal Processor) constantly in the minimum point of each half-wave with direct supply; Peak detection circuit PKC output terminal is delivered to the collection of simulant signal input end of digital signal processor, its retention time constant is greater than 0.1s, and the collection of simulant signal input end that DSP is delivered in the output of PKC.O end is used to obtain the half-wave peak-data to determine each time duration of charging.Public charging current limiter resistance R r is connected with direct supply, and maximum charging current is limited in about 1A; The charging current limiter resistance R r other end connects power supply short circuit switch S p and more than one tank circuit, and the charge switch Sc and the discharge switch Sd of tank circuit pass through digital signal processor.
Power supply short circuit switch S p, when the activation sequence of each transducer is moved, cause weighted error for avoiding high direct voltage pulsation power supply to directly act on each exciting circuit, before excitation, make high direct voltage by temporary transient (less than the 500 μ s) short circuit of Rr quilt by DSP control Sp.C end, therefore this short circuit can not have any impact to underground power supply system owing to the near zero-crossing point and the time that are selected at Alternating Current Power Supply are very short; By D01, Cl, (total system has multichannel to composition such as Sc01 and Sd01 first via tank circuit, the two-way of numbering 01 and 24 draws among Fig. 2), the effect of D01 is to make storage capacitor Cl can not have influence on other each road to this road pulse-excited circuit discharge by Vh01, Sc01 is charge switch and is controlled by Sc01.C by DSP, Sd01 is the residual charge discharge switch, after finishing, an excitation operation cycle bleeds off because the residual charge that different incentive conditions cause may existing among the C01 makes C01 obtain amplitude weighting coefficient accurately in the charging next time by Sd01.C end control Sd01 conducting by DSP.
Electronic switch S of the present invention connects level translator U by V-type groove MOS (metal-oxide-semiconductor) memory (VMOS) and forms (Fig. 1), control end and switch terminals adopt form altogether, are finished the positive high voltage switch terminals P of drain electrode and the break-make of G by the TTL input end C control N raceway groove VMOS power device of level translator U.
The sound wave emissions control system that among the present invention during the work of circuit with the digital signal processor DSP is core is sent the amplitude weighting signal of phased array excitation, and the amplitude weighting aspect of sending the phased array excitation is according to the setting of well logging needs.DPS is according to zero passage, the required amplitude weighting parameter arrangement of the parameter that peak detection circuit provides and this emission circulation to the order of each road excitation and constantly and calculate the required duration of charging, according to Rr and Cx (x:01～24, the feasible charging that can in a rectified half-waves (10ms), finish 3～6 groups of storage capacitors of value down together), wherein need duration of charging of the shunt of high weight to be arranged centre position near half-wave, Sp and Sdx all disconnect between to the charge period on each road, and only conducting between to the storage capacitor charge period on each road of Scx, circuit is in waiting status after all each roads chargings finish (needing 40～80ms time altogether).After the firing order of instrument system (receiving by the system communication interface) arrives, under DSP control, at first connect Sp and temporarily forbid the high direct voltage effect, connecting all Scx then makes Cx for providing energy along separate routes for each driving pulse, subsequently each exciting circuit under DSP control difference constantly (being so-called phase weighting control) specific element of transducer is produced the transponder pulse of Rack, its pulse height is by the energy decision (being amplitude weighting control) of each road storage capacitor storage.After all excitations were finished, Sdx also connected under the situation that keeps connecting at Scx, and moment, (＜20 μ s) discharged the residual charge that exists in each storage capacitor.Afterwards, comprise that all switches (totally 49) of Sp, Scx and Sdx disconnect, this working cycle finishes.
Go round and begin again, can form the pass through a plurality of independently driving sources of phase array transducer according to different order, different interval and varying strength are encouraged successively, thereby produce needed directed acoustic irradiation.
The present invention adopts but is not limited to IRF460 or the IRF460P that VMOS power device model is the 500V/20A/300W magnitude, and level translator U adopts CD4504BF.Digital signal processor DSP adopts but the model that is not limited to is SM320LF2407APGEMEP or TMS320F2812PGFQ.
Claims (8)
1, a kind of amplitude weighting circuit of phased array in acoustic wave logging excitation, become by step-up transformer (T), full-bridge rectification (BR), electronic switch (S), zero cross detection circuit (ZCC), peak detection circuit (PKC), tank circuit, bank of digital signal processors, it is characterized in that:
Zero cross detection circuit (ZCC) is connected with direct supply with peak detection circuit (PKC), zero cross detection circuit (ZCC) output control logic signal is to the starting point of digital signal processor mark charging sequential, peak detection circuit (PKC) output terminal is delivered to the collection of simulant signal input end of digital signal processor, obtains the half-wave peak-data to determine each time duration of charging; Charging current limiter resistance (Rr) is connected with full-bridge rectification (BR) direct supply, and the other end connects power supply short circuit switch (Sp) and more than one tank circuit, and charge switch of tank circuit (Sc) and discharge switch (Sd) pass through DSP CONTROL;
Described electronic switch (S) connects level translator (U) by V-type groove MOS (metal-oxide-semiconductor) memory (VMOS) and forms, control end and switch terminals adopt form altogether, are finished the positive high voltage switch terminals P of drain electrode and the break-make of G by input end (TTL) the control N raceway groove VMOS power device of level translator (U);
Tank circuit is by rectifying device (D), storage capacitor (C), and charge switch (Sc) is composed in series, and is connected with discharge switch (Sd) on storage capacitor (C), and rectifying device (D) makes storage capacitor (C) connect the pulse-excited circuit discharge by Vh.
2, the amplitude weighting circuit of phased array in acoustic wave logging excitation according to claim 1 is characterized in that: described power supply short circuit switch (Sp) makes high direct voltage pass through charging current limiter resistance (Rr) by temporary transient short circuit by DSP CONTROL before excitation.
3, the amplitude weighting circuit of phased array in acoustic wave logging excitation according to claim 1 and 2 is characterized in that: the temporary transient short circuit time of described power supply short circuit switch (Sp) is less than 500 μ s.
4, the amplitude weighting circuit of phased array in acoustic wave logging excitation according to claim 1 is characterized in that: described charging current limiter resistance (Rr) restriction maximum charging current is 0.8-1.2A.
5, the amplitude weighting circuit of phased array in acoustic wave logging excitation according to claim 1, it is characterized in that: described peak detection circuit (PKC) retention time constant is greater than 0.1s.
6, the amplitude weighting circuit of phased array in acoustic wave logging excitation according to claim 1 is characterized in that: the positive high voltage signal conduction of described VMOS drain electrode and turn-off time are all less than 5 μ s.
7, the amplitude weighting circuit of phased array in acoustic wave logging excitation according to claim 1, it is characterized in that: described VMOS power device adopts the IRF460 or the IRF460P of 500V/20A/300W magnitude; Level translator U adopts CD4504BF.
8, the amplitude weighting circuit of phased array in acoustic wave logging excitation according to claim 1 and 2, it is characterized in that: described digital signal processor DSP adopts SM320LF2407APGEMEP or TMS320F2812PGFQ.
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| CNB2006100986764A CN100487492C (en) | 2006-07-12 | 2006-07-12 | Amplitude weighting circuit excitated by phased array in acoustic wave logging |
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| CNB2006100986764A CN100487492C (en) | 2006-07-12 | 2006-07-12 | Amplitude weighting circuit excitated by phased array in acoustic wave logging |
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| CN100487492C true CN100487492C (en) | 2009-05-13 |
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| CN103235340B (en) * | 2013-03-29 | 2016-03-16 | 中国石油天然气集团公司 | The switchable sound wave well logging transducer of a kind of pulse launches direct-drive circuit |
| DE102015103713A1 (en) * | 2015-02-02 | 2016-08-04 | Ebm-Papst Mulfingen Gmbh & Co. Kg | inrush |
| CN111608625A (en) * | 2020-07-09 | 2020-09-01 | 清华四川能源互联网研究院 | Shock wave generating device and method for increasing production of oil and gas well |
| CN111980662B (en) * | 2020-07-14 | 2023-11-07 | 中国石油大学(华东) | Rapid processing method for lateral logging data of inclined shaft anisotropic stratum array |
| CN115509293B (en) * | 2022-09-15 | 2024-01-23 | 中国船舶重工集团公司七五0试验场 | Sonar emission power regulation circuit, system and control method |
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