CN107956471A - A kind of well logging tiny signal modulate circuit system - Google Patents
A kind of well logging tiny signal modulate circuit system Download PDFInfo
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- CN107956471A CN107956471A CN201711244492.9A CN201711244492A CN107956471A CN 107956471 A CN107956471 A CN 107956471A CN 201711244492 A CN201711244492 A CN 201711244492A CN 107956471 A CN107956471 A CN 107956471A
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- 238000005259 measurement Methods 0.000 claims abstract description 31
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- 238000000034 method Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 abstract description 30
- 239000011888 foil Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
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- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
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- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
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- 235000008434 ginseng Nutrition 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The present invention relates to well logging field, discloses a kind of well logging tiny signal modulate circuit system, including：The change of the resistance strain gage resistance value can be converted to voltage signal by strain bridge module, including the strain bridge that the resistance strain gage by being pasted onto on drill string forms, the strain bridge；Amplification module, including two-stage amplifying circuit, the voltage signal for being exported to the strain bridge module are amplified；Filter module, for filtering out the noise signal in the amplification module output signal；A/D modular converters, digital signal is converted to by filtered voltage analog signal；Micro-control unit MCU, for carrying out data processing to the digital signal Jing Guo the A/D module processings, obtains the engineering parameter of measurement.The present invention can measure the real the pressure of the drill in underground and moment of torsion, and drilling parameter, change drilling mode, safety drilling are quickly and accurately adjusted for drilling engineer and provides real-time foundation.
Description
Technical field
The present invention relates to well logging field, more particularly to a kind of well logging tiny signal modulate circuit system.
Background technology
Well logging generally refers to the measurement stratum petrophysical parameter during drilling well, and will with data telemetry system
Measurement result is sent to ground and is handled in real time.Logging while drilling technology is the key technology that geologic steering drilling instructs to complete, right
It is very crucial for completion high angle hole, decision-making in-situ, explanation, real-time well site data acquisition, horizontal wells.
Well logging is that logger is arranged close to the position of drill bit, various with regard to measurement stratum after bottom just bores out
A kind of logging method of information.It carries out drilling well orientation by measurement stratum inclination angle and orientation, drill bit direction, the pressure of the drill, moment of torsion etc.
Control, the resistivity of measurement stratum, natural potential, natural gamma, density/neutron, nuclear-magnetism, interval transit time etc., its measurement result
Overcome a series of influence of environmental conditions such as the expanding, mud invasion of wellbore.Well logging can provide stratum and well bore letter in real time
Breath, makes stratum Fast Evaluation, optimizes well track and geologic objective, instructs drilling, especially problem wells, high angle hole,
Show that it is more even more important than wireline logging in horizontal well.
In drilling process, the drilling engineering parameter such as the pressure of the drill, moment of torsion accurately measures to safe efficient brill with brill at nearly drill bit
Well is highly important.By being analyzed and processed to the real-time measurement values of nearly drill bit engineering parameter, each measurement can be summarized
Parameter finds and controls in time some drilling failures to the affecting laws of drilling course and efficiency, reaches safe efficient drilling well
Purpose, really realizes devoid of risk drilling well.But in the nearly drill bit the pressure of the drill in underground, torque measurement, since subsurface environment is complicated, quilt
Detect weak output signal and with very noisy signal, signal processing can be caused difficult.
The present invention provides a kind of well logging tiny signal modulate circuit system, can accurately measure drill string the pressure of the drill and
Moment of torsion, real-time foundation is provided for safety drilling.
The content of the invention
The technical problems to be solved by the invention are, there is provided a kind of well logging tiny signal modulate circuit system, can
Detect the pressure of the drill and moment of torsion of underground in real time by the change in resistance of measuring strain piece.
The concrete technical scheme of the present invention is as follows：
A kind of well logging tiny signal modulate circuit system, including：
Strain bridge module, including the strain bridge that the resistance strain gage by being pasted onto on drill string forms, the electrostrictive strain
The change of the resistance strain gage resistance value can be converted to voltage signal by bridge；
Amplification module, including two-stage amplifying circuit, the voltage signal for being exported to the strain bridge module are put
Greatly；
Filter module, for filtering out the noise signal in the amplification module output signal；
A/D modular converters, digital signal is converted to by filtered voltage analog signal；
Micro-control unit MCU, for carrying out data processing to the digital signal Jing Guo the A/D module processings, is obtained
Take the engineering parameter of measurement.
Further, the strain bridge includes the pressure of the drill measuring strain electric bridge and torque measurement strain bridge.
Preferably, the pressure of the drill measuring strain electric bridge and the torque measurement strain bridge respectively with the amplification module,
Filter module, A/D modular converters and micro-control unit MCU form independent data acquisition channel.
Further, the resistance strain gage of the pressure of the drill measuring strain electric bridge is pasted along with axis into 90 degree of direction, institute
The resistance strain gage for stating torque measurement strain bridge is pasted along with axis into 45 degree of direction.
Preferably, the strain bridge is full equal arm bridge.
Further, the two-stage amplifying circuit includes first order amplifying circuit and second level amplifying circuit, and described first
The gain of level amplifying circuit is 100, and the gain of the second level amplifying circuit is 10.
Preferably, the filter module includes second order active bandwidth-limited circuit, for filtering out the high-frequency signal in signal
And low frequency signal.
Further, the circuit system further includes high temperature power module circuitry, described for for each module for power supply of system
The supply voltage of high temperature power module circuitry is ± 5V.
Further, the circuit system further includes memory module, for storing the every engineering obtained in measurement process
Parameter.
Preferably, the circuit system further includes polarity adjustment circuit and balancing add circuit, should for eliminating exchange
Become the amount of unbalance of electric bridge.
Implement the embodiment of the present invention, have the advantages that：
The present invention can measure the real the pressure of the drill in underground and moment of torsion, and drilling well ginseng is quickly and accurately adjusted for drilling engineer
Number, change drilling mode, the real-time foundation of safety drilling offer.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of strain bridge provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of well logging tiny signal modulate circuit system provided in an embodiment of the present invention；
The paste position schematic diagram of foil gauge when Fig. 3 is compression provided in an embodiment of the present invention；
The paste position schematic diagram of foil gauge when Fig. 4 is provided in an embodiment of the present invention turned round；
Fig. 5 is a kind of high temperature power module circuit diagram provided in an embodiment of the present invention；
Fig. 6 is a kind of circuit diagram of signal amplification circuit provided in an embodiment of the present invention；
Fig. 7 is a kind of circuit diagram of polarity adjustment circuit provided in an embodiment of the present invention；
Fig. 8 is a kind of circuit diagram of balancing add circuit provided in an embodiment of the present invention；
Fig. 9 is a kind of circuit diagram of filter circuit provided in an embodiment of the present invention；
Figure 10 is bandpass filter exchange simulation waveform provided in an embodiment of the present invention；
Figure 11 is bandpass filter Transient oscillogram provided in an embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
It is described in detail on step ground.Obviously, described embodiment only a part of embodiment of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, should all belong to the scope of protection of the invention.
It should be noted that term " first ", " second " in description and claims of this specification etc. is to be used for
Similar object is distinguished, without for describing specific order or precedence.It should be appreciated that the data so used are fitted again
It can be exchanged in the case of, so that the embodiment of the present invention described herein can be with those except illustrating or describing herein
Order in addition is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover non-exclusive
Comprising being not necessarily limited to clearly list for example, containing the process of series of steps or unit, method, system, product or equipment
Those steps or unit, but may include not listing clearly or intrinsic for these processes, method, product or equipment
Other steps or unit.
Strain bridge can be converted into the minor variations of foil gauge resistance value the change of output voltage.Its advantage is to measure
Go out the real the pressure of the drill in shaft bottom and moment of torsion, quickly and accurately adjust drilling parameter for drilling engineer, change drilling mode, safety brill
Well provides real-time foundation.In drilling process, the drilling engineering parameter such as the pressure of the drill of drill string, moment of torsion with bore accurate measurement to safety,
Efficient drilling well is highly important.
Measurement the pressure of the drill, the method for moment of torsion are exactly resistance strain gage to be laid out in a certain way composition bridge, are pasted onto survey
Measure on object, the change of resistance strain gage bridge produced using deformation of the measurement object in loading process, export corresponding the pressure of the drill,
The voltage signal of moment of torsion, detects this signal, then can accurately measure the moment of torsion and the pressure of the drill of underground dynamic change.
The resistance variations Δ R that resistance strain gage occurs because being deformed with structure, usually with four arm electrical bridge (resistance bridge)
To measure, as shown in Figure 1, the resistance of four bridge arms AB, BC, CD and DA are respectively R in figure1、R2、R3And R4.If they are electricity
Foil gauge is hindered, then referred to as full-bridge connection.When electric bridge is full-bridge connection, it is according to the voltage that electrical principles electric bridge exports：
If R1R3=R2R4, then U=0, electric bridge are in equilibrium state., should be first by electric bridge pre-leveling before strain measurement
Weighing apparatus, makes electric bridge not export.Therefore, when test specimen stress deformation, it is attached to foil gauge R thereon1、R2、R3And R4That experiences should
Change is ε1、ε2、ε3And ε4, the resistance value of each accordingly changes, its variable quantity is respectively Δ R1、ΔR2、ΔR3With Δ R4, by
The output voltage that formula (1) can try to achieve electric bridge at this time is：
For resistance strain gage Ri(i=1,2,3,4) have
Wherein, KiFor the sensitivity coefficient of foil gauge, εiFor foil gauge longitudinal direction, axial strain value.If the unified electric bridge of composition
The sensitivity coefficient of foil gauge is K, then can be rewritten into formula (2)：
Shown by formula (4), (ε experienced by foil gauge1-ε2+ε3-ε4), voltage can be linearly changed into by electric bridge
Change UBD。
Embodiment 1
A kind of well logging tiny signal modulate circuit system is present embodiments provided, as shown in Fig. 2, including strain bridge
Module, amplification module, filter module, A/D modular converters and micro-control unit MCU.
The strain bridge module includes the strain bridge being made of the resistance strain gage being pasted onto on drill string, the strain
Electric bridge includes the pressure of the drill measuring strain electric bridge and torque measurement strain bridge.The pressure of the drill measuring strain electric bridge and the torque measurement
Strain bridge forms independent number with the amplification module, filter module, A/D modular converters and micro-control unit MCU respectively
According to acquisition channel.
In the present embodiment, the strain bridge uses full equal arm bridge.
Drill collar drilling, it is lower bore, pull out of hole etc. in different drilling process, the stressing conditions of drill collar/drill string different parts with
Forms of motion difference is very big.Mainly include：Axial tension and the inside and outside extruding of pressure, moment of torsion, bending moment, centrifugal force, drill collar, indulge
To vibration, twisting vibration, side shake etc..Due to the compound movement form of drill string and drill collar, drill bit have in shaft bottom whirling motion phenomenon,
Bottom Hole Bit Weight In A fluctuation is very big, or even the bouncing of drilling tool phenomenon that drill bit leaves shaft bottom occurs.
In theory, the power suffered by drill collar can be reduced to torque：The moment of torsion of the pressure of the drill, transmission drill string to drill bit application,
There is the drill vibration in the bending moment and drilling process that drillstring motion and shaft bottom reaction force produce.From the angle of e measurement technology
Degree, can be subject to axial tension and compression and vibration, around axial a pair of of moment of torsion and drill collar by drill collar force simplified for thick-walled tube
The Moment being radially subject to.
Tension and compression and the measurement of distorting stress are all based on the strain effect of stress object in the mechanics of materials, utilize stress change principle
Come what is realized.Along drill collar cylinder axis to 0 degree, 90 degree of stickup foil gauges, drill collar is obtained by the resistance variations of measuring strain piece
It is subject to the size of tension and compression active force；Along drill collar cylinder axis to ± 45 degree of stickup foil gauges, become by the resistance of measuring strain piece
Change and obtain the size that drill collar is subject to torsional moment.
Correct foil gauge of pasting is the committed step for ensureing accurately to measure, and inappropriate stickup will cause drift, creep etc.
Problem.In the present embodiment, when be stressed effect when, as shown in figure 3, foil gauge with axis into 90 degree of direction along gluing during measurement
Patch, then generally refer to show strain for the ε of ε '=2 (1+ ν) ε=2.56.When being acted on by moment of torsion, as shown in figure 4, foil gauge edge during measurement
Pasted with axis into 45 degree of direction, then generally refer to show strain for the ε of ε '=4.
As shown in Figure 3 and Figure 4, in the present embodiment, the resistance strain gage of the pressure of the drill measuring strain electric bridge along with axis into
90 degree of direction is pasted, and the resistance strain gage of the torque measurement strain bridge is pasted along with axis into 45 degree of direction.
The amplification module includes two-stage amplifying circuit, for the weak voltage signals exported to the strain bridge module
It is amplified.The weak voltage signals are that deformation of the resistance strain gage in loading process causes the resistance strain gage
The change of resistance value, the voltage signal exported by the strain bridge.The two-stage amplifying circuit include first order amplifying circuit and
Second level amplifying circuit, the gain of the first order amplifying circuit is 100, and the gain of the second level amplifying circuit is 10.
The filter module is used to filter out the noise signal in the amplification module output signal.The filter module includes
Second order active bandwidth-limited circuit, for filtering out high-frequency signal and low frequency signal in signal.
Filtered voltage analog signal is converted to digital signal by the A/D modular converters.
The micro-control unit MCU is used to carry out data processing to the digital signal Jing Guo the A/D module processings,
Obtain the engineering parameter of measurement.
The well logging tiny signal modulate circuit system further includes high temperature power module circuitry, memory module and tune
Balancing circuitry.
The high temperature power module circuitry, for for each module for power supply of system；The memory module, measured for storing
The parameters obtained in journey；The balancing circuit includes polarity adjustment circuit and balancing add circuit, for eliminating just
Zero migration under beginning state.
Embodiment 2
A kind of high temperature power module circuitry is present embodiments provided, can be powered for downhole instrument, as shown in figure 5,
The power supply of measuring circuit is the electricity be converted to P5V and N5V high temperature power modules to signalling channel and to reference channel power supply
Source.
High temperature power module circuitry includes input module, modular converter and output module, and the input module includes voltage
Input terminal, for inputting voltage to be converted；The modular converter is connected with the input module, and the modular converter is included just
Voltage transformation module and negative voltage transition module, the negative voltage transition module is with the output voltage of the positive voltage modular converter
As input voltage；The output module is connected with the modular converter, and the output module includes voltage output end, for defeated
Go out transformed positive and negative voltage.Wherein, the input voltage of the input module is 12V~46V, the output of the output module
Voltage is+5V and -5V, is powered to signalling channel and reference channel.
The positive voltage modular converter includes converter U1, the converter U1 and draws including VIN pins, RUN pins, ISET
Foot, SW pins, VFB pins, VPRG1 pins, VPRG2 pins and SS pins.The converter U1 turns for synchronous buck type DC/DC
Parallel operation, model LTC3630A.
The negative voltage transition module, which includes negative output voltage-stablizer U2, the negative output voltage-stablizer U2, includes SW pins, Vin
Pin, D pins, FB pins and SDREF pins.
The operating temperature of the converter U1 of the positive voltage modular converter is -40 DEG C~150 DEG C, the negative voltage transition mould
The operating temperature of the negative output voltage-stablizer U2 of block is -40 DEG C~85 DEG C.The circuit board size of the high temperature power module circuitry is：
33mm × 22mm, and use sealing metal embedding.
High temperature module power supply circuit high temperature resistant provided in this embodiment, stamping resistance, humidity, are particularly suitable for being participated in it
Set up petroleum exploration downhole instrument, geophysical exploration instrument, vehicle and means of transport, Telecommunications ＆ Networking infrastructure, enterprise
With the powersupply system of high-performance calculation etc..
The maximum operating temperature of the high temperature power module circuitry is not less than 160 DEG C, and the output voltage of design has 3.3V, 5V,
7V, 9V, 12V, 15V, 18V, 24V, 36V, 48V, you can therein any any all the way or among them to export
Two-way, the combination of three tunnels, they can be connected composition various forms of output combinations as required during use is made with facilitating
With.
Embodiment 3
A kind of signal amplification circuit is present embodiments provided, as shown in fig. 6, since the output voltage of strain bridge is one
Very faint signal, in order to detect this signal, is amplified by signal amplification circuit.Since the signal of output is with strong
Otherwise noise can cause saturation to show, it is necessary to improve the common-mode rejection ratio of whole circuit, and the gain of amplifying circuit cannot be excessive
As.For this reason, using the method for two-stage amplifying circuit, including first order amplifying circuit and second level amplifying circuit.
First order amplifying circuit includes the first amplifier, and first amplifier is general purpose instrument amplifier, can be obtained
Sufficiently high common-mode rejection ratio, gain determine by the equivalent resistance Rg between the pin 1 and pin 8 of the first amplifier, this implementation
Rg in example is the 22nd resistance R22, and gain calculation formula is as follows：
G=1+49.4K/Rg=100 (5)
In equation (5) 49.4K Ω be two internal feedback resistance and, in these pieces metal thin film resistor be with laser into
Row is finely tuned to absolute precision value.The precision and temperature coefficient of these internal resistances are included in amplifier gain precision and temperature drift
In specification.It should be noted that the precision of the first amplifier is higher, in order to ensure precision, differential mode letter is reduced to the greatest extent
Number common-mode signal is converted to, resistance must reach centesimal precision.First amplifier has low-down bias voltage, temperature
Degree drift and high common mode inhibition, its supply voltage as low as ± 2.25V and quiescent current only has 700uA, are battery power supply systems
Ideal chose.Inside input protection be amenable to ± 40V voltages and without damage.
Output voltage through first order amplifying circuit is
Uo1=(Vb-Vd) * G (6)
Second level amplifying circuit includes the second amplifier, and 10 times of amplification is carried out to signal.Second amplifier is single
Power supply, 4MHz bandwidth amplifiers, have rail-to-rail input and output characteristics.The amplifier is adapted to requirement exchange performance and precise direct
The single supply application of fluidity energy.Bandwidth, low noise are combined with delicate nature answers so as to fit wave filter and instrument and meter etc. are various
With.
Embodiment 4
A kind of balancing circuit is present embodiments provided, as shown in Figure 7 and Figure 8, including polarity adjustment circuit and balancing
Add circuit, the output terminal of the polarity adjustment circuit are connected with the input terminal of the add circuit.
In Fig. 7, R10 is disconnected, R4 connections, be then in-phase proportion amplifier, R10 connected, R4 disconnections, be then anti-phase ratio
Example amplifier.The value of R9 and R16 is adjusted, changes the size of reference signal, output signal is Uo3.
Signalling channel as shown in Figure 8 and the add circuit of reference channel, this is the positive add operation of one two input
Circuit, wherein input signal are Uo2 and Uo3, are connected to computing by the 12nd resistance R12 and the 15th resistance R15 respectively and put
The in-phase input end of big device.Reverse input end is grounded through balance resistance R8.The output voltage of adder operation circuit is defeated equal to each
Enter the sum of voltage, it can be achieved that the add operation of multiple input signal.
In specific implementation process, reference signal is inputted from the input terminal of balancing circuit, i.e., from polarity adjustment circuit
Input terminal inputs, and amplifier is selected according to the polarity of signal, and when the tenth resistance R10 is disconnected, the 4th resistance R4 is connected, at this time polarity
Adjustment circuit is in-phase proportion amplifier；When the tenth resistance R10 is connected, the 4th resistance R4 is disconnected, anti-phase proportional amplifier, through place
Signal Uo3 after reason is exported from the output terminal of polarity adjustment circuit.Wherein, can be by adjusting the 9th resistance R9 and the 16th resistance
The resistance value of R16, to change the size of reference signal.
The add circuit includes two input terminals, is respectively intended to input bridge signal and reference signal, one of them is defeated
Enter end with the output terminal of the polarity adjustment circuit to be connected, another input terminal is connected with the output terminal of amplifying circuit, described to put
Big circuit is used for being amplified the output signal of the strain bridge of collection.Reference signal and warp through polarity adjustment circuit adjustment
The bridge signal of amplifying circuit amplification is carried out on the contrary, after add circuit, can eliminate the amount of unbalance in bridge.
Embodiment 5
A kind of second order Butterworth bandpass filters are present embodiments provided, its circuit diagram is as shown in figure 9, this implementation
In example, its centre frequency is 100Hz, bandwidth 10Hz, quality factor q=10.
To bandpass filter plus an AC signal, amplitude 1V carries out transactional analysis, and simulation waveform is as shown in Figure 10.
To bandpass filter plus a sine wave signal, amplitude 1V, frequency 100Hz, offset 0V, carries out transient state point
Analysis, simulation waveform are as shown in figure 11.
The above disclosed right for being only presently preferred embodiments of the present invention, the present invention cannot being limited with this certainly
Scope, therefore equivalent variations made according to the claims of the present invention, are still within the scope of the present invention.
Claims (10)
- A kind of 1. well logging tiny signal modulate circuit system, it is characterised in that including：Strain bridge module, including the strain bridge that the resistance strain gage by being pasted onto on drill string forms, the strain bridge energy It is enough that the change of the resistance strain gage resistance value is converted into voltage signal；Amplification module, including two-stage amplifying circuit, the voltage signal for being exported to the strain bridge module are amplified；Filter module, for filtering out the noise signal in the amplification module output signal；A/D modular converters, digital signal is converted to by filtered voltage analog signal；Micro-control unit MCU, for carrying out data processing to the digital signal Jing Guo the A/D module processings, obtains and surveys The engineering parameter of amount.
- A kind of 2. well logging tiny signal modulate circuit system according to claim 1, it is characterised in that the strain Electric bridge includes the pressure of the drill measuring strain electric bridge and torque measurement strain bridge.
- A kind of 3. well logging tiny signal modulate circuit system according to claim 2, it is characterised in that described the pressure of the drill Measuring strain electric bridge and the torque measurement strain bridge respectively with the amplification module, filter module, A/D modular converters and Micro-control unit MCU forms independent data acquisition channel.
- A kind of 4. well logging tiny signal modulate circuit system according to claim 3, it is characterised in that described the pressure of the drill The resistance strain gage of measuring strain electric bridge is pasted along with axis into 90 degree of direction, and the resistance of the torque measurement strain bridge should Become piece to paste into 45 degree of direction along with axis.
- A kind of 5. well logging tiny signal modulate circuit system according to claim 4, it is characterised in that the strain Electric bridge is full equal arm bridge.
- A kind of 6. well logging tiny signal modulate circuit system according to claim 1, it is characterised in that the two-stage Amplifying circuit includes first order amplifying circuit and second level amplifying circuit, and the gain of the first order amplifying circuit is 100, described The gain of second level amplifying circuit is 10.
- A kind of 7. well logging tiny signal modulate circuit system according to claim 1, it is characterised in that the filtering Module includes second order active bandwidth-limited circuit, for filtering out high-frequency signal and low frequency signal in signal.
- A kind of 8. well logging tiny signal modulate circuit system according to claim 1, it is characterised in that the circuit System further includes high temperature power module circuitry, for for each module for power supply of system, the power supply electricity of the high temperature power module circuitry Press as ± 5V.
- A kind of 9. well logging tiny signal modulate circuit system according to claim 8, it is characterised in that the circuit System further includes memory module, for storing the every engineering parameter obtained in measurement process.
- A kind of 10. well logging tiny signal modulate circuit system according to claim 9, it is characterised in that the electricity Road system further includes polarity adjustment circuit and balancing add circuit, for eliminating the amount of unbalance of exchange strain bridge.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542766A (en) * | 2019-08-22 | 2019-12-06 | 中国船舶重工集团公司第七0七研究所九江分部 | processing circuit suitable for acoustic Doppler measures velocity of flow |
| CN112459770A (en) * | 2020-11-24 | 2021-03-09 | 成都多贝石油工程技术有限公司 | Bending moment measurement system and method for underground engineering parameter instrument |
| CN112964406A (en) * | 2021-04-09 | 2021-06-15 | 杭州电子科技大学 | Mechanical weak fiber tension amplifying device |
| CN113686233A (en) * | 2021-09-13 | 2021-11-23 | 武汉智能控制工业技术研究院有限公司 | Automobile structure strain data testing system |
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| CN112964406A (en) * | 2021-04-09 | 2021-06-15 | 杭州电子科技大学 | Mechanical weak fiber tension amplifying device |
| CN113686233A (en) * | 2021-09-13 | 2021-11-23 | 武汉智能控制工业技术研究院有限公司 | Automobile structure strain data testing system |
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