CN108226225A - Electronic device for separating formation potential signal and measuring circuit noise - Google Patents
Electronic device for separating formation potential signal and measuring circuit noise Download PDFInfo
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- CN108226225A CN108226225A CN201611161705.7A CN201611161705A CN108226225A CN 108226225 A CN108226225 A CN 108226225A CN 201611161705 A CN201611161705 A CN 201611161705A CN 108226225 A CN108226225 A CN 108226225A
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- electronic device
- potential signal
- electric potential
- measurement circuit
- circuit noise
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- 230000015572 biosynthetic process Effects 0.000 title abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims description 34
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 description 14
- 230000005611 electricity Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/46—One-port networks
Abstract
An electronic device for separating formation potential signals and measuring circuit noise, the electronic device comprising: a substrate; an operational amplifier on the substrate for amplifying the formation potential signal; a filter circuit located on the substrate, the filter circuit being located between the operational amplifier and a system voltage terminal, the filter circuit being used for filtering noise of the system voltage terminal; a first series needle base located on the base plate; and a second series needle seat which is arranged on the substrate and is connected with the first series needle seat, wherein the first series needle seat and the second series needle seat are used for connecting other substrates in series.
Description
Technical field
The present invention relates to a kind of measuring equipments of stratum current potential.
Background technology
On ground, electrical resistivity survey is surveyed in research, when the stratum electric potential signal that measurement obtains passes through cable to data logger, warp
Often because cable is by outside electromagnetic interference, prime stratum electric potential signal is had an impact, when outside noise is excessive, in some instances it may even be possible to
Cover true stratum electric potential signal.Cable noise problem is generally solved, coaxial cable can be used and carry out signal transmission,
Construction has shielding action to extraneous electromagnetic signal, is less susceptible to by external interference, and suitable for transmitting high-frequency signal, but signal frequency
Higher, attenuation is bigger, and therefore, during nearly 200 meters of coaxial cable transmission range, signal quality can be decreased obviously, and cable exists
During wiring, circuit should be avoided to bend, connector is it should also be noted that waterproof, high temperature-proof and solarization.It is applied however, ground electrical resistivity survey surveys field work
During survey, compared with high temperature and solarization can not be avoided, and transmission line may need bending to meet testing route, such as above-mentioned technical difficulty
It is described, need separately there are means to solve circuit transmission noise problem.
Invention content
The purpose of the present invention is to provide a kind of for detaching the electronic device of stratum electric potential signal and measurement circuit noise,
The electronic device includes：One substrate；One operational amplifier, on the substrate, the operational amplifier is electric to amplify the stratum
Position signal；One filter circuit, on the substrate, which is located between the operational amplifier and a system voltage end,
The filter circuit is filtering the noise at the system voltage end；One first series connection needle stand, on the substrate；And one second string
Join needle stand, on the substrate, which connects the first series connection needle stand, wherein the first series connection needle stand with this
Two series connection needle stands are to other substrates of connecting.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Description of the drawings
Fig. 1 illustrates the schematic diagram of stratum current potential measurement according to some embodiments；
Fig. 2 illustrates the circuit diagram of electronic device according to some embodiments.
Wherein, reference numeral
10 earth's surface, 11 stratum
12 power supply, 13 electronic device
14 electronic device, 15 cable
17 data logger, 19 computer
21 substrate, 22 operational amplifier
25 filter circuit, 26 system voltage end
The 28 first series connection series connection needle stands of needle stands 29 second
31 system high voltage end, 32 system low-voltage end
33 system high voltage end, 34 second stitch
The 4th stitch of 35 third stitch 36
The 6th stitch of 37 the 5th stitch 38
40 input needle stands 41 export needle stand
43 line selector, 45 output terminal
46 inverting input, 47 non-inverting input
R1 first resistor R2 second resistances
The 4th resistance of R3 3rd resistors R4
The 5th the first capacitances of resistance C1 of R5
C2 the second capacitance the first polar capacitors of C3
C4 the second polar capacitor GND ground terminals
A, B galvanic electrodes M, N voltage electrodes
Specific embodiment
The structural principle and operation principle of the present invention are described in detail below in conjunction with the accompanying drawings：
The present invention propose it is a kind of when being suitable for a wide range of formation resistivity and being prospected with current potential, for detach stratum electric potential signal and
The electronic device of measurement circuit noise.Electronic device is connected to after the receiving electrode of stratum electric potential signal, electronic device is put
It is exported again after the electric potential signal of big stratum, the circuit noise caused by stratum electric potential signal and remote transmission can be distinguished, effectively
Ground solves transmitted noise interference, and the technical issues of actual data can not be presented.
It is to investigate subsurface resistivity or a kind of related skill electrically constructed that ground electrical resistivity survey, which looks into (geo-electrical survey),
Art includes ground resistance method and self-potential method.Ground resistance prospect be using be passed through the current strength of underground, the current potential measured with
The numerical value such as relative position are calculated between electrode, obtain the distribution situation of resistivity of media in stratum.What self-potential method received
Signal is the existing voltage difference of nature below ground earth ontology.Ground electrical resistivity survey is checked in the good water of conductivity, fluid or substance
There is certain susceptibility, therefore be commonly used to understand subsurface formations lithology and the distribution scenario of underground fluid, and then explain ground texture
Make, prospected suitable for underground heat, hot spring is prospected, subterranean water enquire, underground percolation investigation and seawater invasion investigation etc. projects.
Ground resistance method or self-potential method all need to arrange at least two potential poles in earth's surface, to measure stratum current potential,
And by stratum electric potential signal via in circuit transmission to logger.Since the electric potential signal on stratum is fainter, it is subjected to two kinds
Influence of noise, two kinds of noises include ambient noise and remote transmission circuit noise, and ambient noise can be removed using wave filter,
Remote transmission circuit noise is because transmission range is long and noise energy is similar to the current potential energy size for measuring gained, even if using
Wave filter is also difficult to remove completely so that true stratum electric potential signal is transmitted circuit noise and covers and be not easy to judge.Therefore, lead to
The present invention is crossed for detaching the electronic device of stratum electric potential signal and measurement circuit noise, reduces electricity caused by remote transmission
Road noise restores the current potential obtained by actual measurements, to calculate the distribution scenario for acquiring subsurface formations or fluid.
Fig. 1 illustrates the schematic diagram of stratum current potential measurement according to some embodiments.In one embodiment, it is arranged in earth's surface 10
Galvanic electrode A, galvanic electrode B, potential electrode M and potential electrode N.One power supply 12 or battery provide an electric current to electric current electricity
Pole A and galvanic electrode B, electric current inject stratum 11 by galvanic electrode A and galvanic electrode B.Potential electrode M and potential electrode N
The stratum electric potential signal (voltage) on stratum 11 is received, for detaching the electronic device of stratum electric potential signal and measurement circuit noise
13rd, 14 potential electrode M and potential electrode N is connected respectively.Electronic device 13,14 receives and amplifies stratum electric potential signal,
The stratum electric potential signal of amplification is transferred to data logger 17 (data logger), then carry out by computer 19 by cable 15
Data analysis.
Fig. 2 illustrates the circuit diagram of electronic device 13 according to some embodiments.The circuit structure of electronic device 13 is filled with electronics
It is identical to put 14.In one embodiment, a kind of electronic device 13 for being used to detach stratum electric potential signal and measurement circuit noise, electronics
Device 13 includes：Substrate 21；Operational amplifier 22 is located on substrate 21,22 (operational of operational amplifier
Amplifier) amplifying stratum electric potential signal；Filter circuit 25 is located on substrate 21, and filter circuit 25 is located at operation amplifier
Between device 22 and system voltage end 26, filter circuit 25 to filtration system voltage end 26 noise；First series connection needle stand 28
In on substrate 21；And second series connection needle stand 29 be located on substrate 21, second series connection needle stand 29 connection first connect needle stand 28,
In first series connection needle stand 28 connect needle stand 29 with second to other substrates of connecting.
In one embodiment, system voltage end 26 includes system high voltage end 31 and system low-voltage end 32, the high electricity of system
Pressure side 31 is a positive value voltage, and system low-voltage end 32 is a negative voltage.In one embodiment, 31 system of system high voltage end+
12 volts, -12 volts of 32 system of system low-voltage end.In one embodiment, filter circuit 25 connects system high voltage end 31 respectively
With system low-voltage end 32.In one embodiment, operational amplifier 22 connects system high voltage end 31 and system low-voltage respectively
End 32.
In one embodiment, the first series connection needle stand 28 includes：First stitch 33, connection system high voltage end 31；Second needle
Foot 34 is grounded；And third stitch 35, connection system low-voltage end 32.In one embodiment, the second series connection needle stand 29 includes：The
Four stitch 36, connection system high voltage end 31；5th stitch 37 is grounded；And the 6th stitch 38, connection system low-voltage end 32.
Therefore the first stitch 33 connects the 4th stitch 36, the second stitch 34 connects the 5th stitch 37, and third stitch 35 connects the 6th stitch 38.
First series connection needle stand 28, second connect needle stand 29 effect be to connect with other substrates, such as multiple electronic devices 13 into
Row series connection connects the first series connection series connection needle stand 29 of needle stand 28, second on each electronic device 13 using winding displacement or connector respectively,
Thereby reach expansion and the modulation of enlargement ratio.
In one embodiment, filter circuit 25 includes：One end connection system high voltage of first capacitance C1, the first capacitance C1
End 31, the other end ground connection of the first capacitance C1；And second capacitance C2, the second capacitance C2 one end connection system low-voltage end
The other end ground connection of 32, the second capacitance C2.In one embodiment, filter circuit 25 additionally comprises：First polar capacitor C3, with first
Capacitance C1 is in parallel；And the second polar capacitor C4, it is in parallel with the second capacitance C2.The anode connection system of first polar capacitor C3
High voltage end 31, a negativing ending grounding of the first polar capacitor C3.The negative terminal connection system low-voltage end of second polar capacitor C4
32, a positive ending grounding of the second polar capacitor C4.In one embodiment, the appearance of the first polar capacitor C3, the second polar capacitor C4
It measures as 4.7 microfarads (uF).Filter circuit 25 to filtration system power supply noise.
In one embodiment, electronic device 13 additionally comprises：Input needle stand 40 is located on substrate 21, the input coupling fortune of needle stand 40
Calculate an inverting input 46 of amplifier 22.In one embodiment, electronic device 13 additionally comprises：Output needle stand 41 is located at substrate 21
On, output needle stand 41 couples the output terminal 45 of operational amplifier 22.In actual use, input needle stand 40 will connect potential electrode
M or potential electrode N exports 41 connecting cable 15 of needle stand.
In one embodiment, electronic device 13 additionally comprises：First resistor R1 is located at input needle stand 40 and operational amplifier 22
Inverting input 46 between, one end of first resistor R1 connection input needle stand 40, the other end of first resistor R1 connects respectively
The inverting input 46 of operational amplifier 22 and line selector 43.In one embodiment, electronic device 13 additionally comprises：Second electricity
R2 is hindered, between output needle stand 41 and the output terminal 45 of operational amplifier 22, one end connection output needle stand of second resistance R2
The other end of 41, second resistance R2 connect output 45, the 4th resistance R4 and the 5th resistance R5 of operational amplifier 22 respectively.
In one embodiment, electronic device 13 additionally comprises：One end of 3rd resistor R3,3rd resistor R3 connect the non-of operational amplifier 22
Inverting input 47, the other end ground connection of 3rd resistor R3.In one embodiment, first resistor R1, second resistance R2, third electricity
The resistance value for hindering R3 is 1K ohm, but not subject to the limits.
In one embodiment, electronic device 13 additionally comprises：4th resistance R4 be located at the output terminal 45 of operational amplifier 22 with
Between inverting input 46, the output terminal 45 of one end connection operational amplifier 22 of the 4th resistance R4, the 4th resistance R4's is another
End connection line selector 43.In one embodiment, electronic device 13 additionally comprises：5th resistance R5 is located at operational amplifier 22
Between output terminal 45 and inverting input 46, the output terminal 45 of one end connection operational amplifier 22 of the 5th resistance R5, the 5th electricity
Hinder the other end connection line selector 43 of R5.In one embodiment, the resistance value of the 4th resistance R4 or the 5th resistance R5 is more than
The resistance value of first resistor R1, and the resistance value of the 4th resistance R4 is more than the resistance value of the 5th resistance R5.In one embodiment,
100K ohm of the resistance value system of 4th resistance R4,20K ohm of the resistance value system of the 5th resistance R5, the resistance value of first resistor R1 are
1K ohm so that operational amplifier 22 is respectively provided with 100 times, 20 times of stratum electric potential signal amplification effect.
In one embodiment, electronic device 13 additionally comprises：Line selector 43 is located at the output terminal 45 of operational amplifier 22
Between inverting input 46, the port of line selector 43 connects the 4th resistance R4 and the 5th resistance R5, route choosing respectively
The corresponding port connection inverting input 46 of device 43, line selector 43 is selecting the open circuit of circuit or short circuit, such as the
The open lines of four resistance R4, the line short of the 5th resistance R5, then the 5th resistance R5 provide 22 enlargement ratio of operational amplifier.
In one embodiment, line selector 43 is the needle stand of 4 stitch, and stitch is plugged using jumper wire device, and the circuit is allowed to become short circuit.
In one embodiment, line selector 43 is multiplexer, uses to form route choosing circuit.
In one embodiment, substrate 21 is a printed circuit board (Printed circuit board).In an embodiment
In, about 3.6 centimeters * 3 centimeters of the size of substrate 21.
In practical operation, Fig. 1,2 are considered in light of actual conditions, galvanic electrode A and galvanic electrode B input currents are to stratum 11, and the electricity generated
When position changes or inputted without aforementioned currents, by the existing potential change of nature earth ontology, by potential electrode M and current potential
Electrode N measures the stratum electric potential signal of ground stratum 11 below 10 generation, and this stratum electric potential signal is being sent to data note
Record device 17 before, stratum electric potential signal first pass through for detach stratum electric potential signal and measurement circuit noise electronic device 13,
14 processing, to data logger 17, the stratum that just can be distinguished by amplification is electric for output after gained stratum electric potential signal is amplified
Position signal and the transmission circuit noise not amplified simultaneously effective remove transmission circuit noise, then the stratum that will pass through amplification
Electric potential signal zooms back out reset condition, i.e., the stratum electric potential signal actually measured.
In one embodiment, since circuit noise caused by distant signal transmission is excessive so that true stratum current potential
Signal is not easy to recognize, therefore proposes for detaching the electronic device of stratum electric potential signal and measurement circuit noise, for ground resistance and
Natural potential is prospected measurement stratigraphic structure and is used with underground fluid, can effectively remove circuit transmission noise problem.For discretely
The electronic device of layer electric potential signal and measurement circuit noise uses difference remote circuitry by amplifying prime stratum electric potential signal
External noise caused by transmission, and then this circuit transmission is removed, obtain true stratum electric potential signal.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and deformation, but these corresponding changes and change in accordance with the present invention
Shape should all belong to the protection domain of appended claims of the invention.
Claims (20)
- A kind of 1. electronic device for being used to detach stratum electric potential signal and measurement circuit noise, which is characterized in that the electronic device Comprising：One substrate；One operational amplifier, on the substrate, the operational amplifier is amplifying the stratum electric potential signal；One filter circuit, on the substrate, which is located between the operational amplifier and a system voltage end, the filter Wave circuit is filtering the noise at the system voltage end；One first series connection needle stand, on the substrate；AndOne second series connection needle stand, on the substrate, which connects the first series connection needle stand, wherein first string Connection needle stand second connects needle stand to other substrates of connecting with this.
- 2. the electronic device according to claim 1 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which includes a system high voltage end and a system low-voltage end.
- 3. the electronic device according to claim 2 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which connects the system high voltage end and the system low-voltage end respectively.
- 4. the electronic device according to claim 2 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which includes：One first stitch connects the system high voltage end；One second stitch, second stitch ground connection；AndOne third stitch connects the system low-voltage end.
- 5. the electronic device according to claim 2 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which includes：One the 4th stitch connects the system high voltage end；One the 5th stitch, the 5th stitch ground connection；AndOne the 6th stitch connects the system low-voltage end.
- 6. the electronic device according to claim 1 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which includes：One first capacitance, one end of first capacitance connect a system high voltage end, the other end ground connection of first capacitance；AndOne second capacitance, one end of second capacitance connect a system low-voltage end, the other end ground connection of second capacitance.
- 7. the electronic device according to claim 6 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which includes：One first polar capacitor, it is in parallel with first capacitance；AndOne second polar capacitor, it is in parallel with second capacitance.
- 8. the electronic device according to claim 7 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, an anode of first polar capacitor connects the system high voltage end, a negativing ending grounding of first polar capacitor.
- 9. the electronic device according to claim 7 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, a negative terminal of second polar capacitor connects the system low-voltage end, a positive ending grounding of second polar capacitor.
- 10. the electronic device according to claim 1 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which additionally comprises：One input needle stand, on the substrate, which couples an inverting input of the operational amplifier.
- 11. it is according to claim 10 for detaching the electronic device of stratum electric potential signal and measurement circuit noise, it is special Sign is that the electronic device additionally comprises：One first resistor, between the input needle stand and the inverting input.
- 12. the electronic device according to claim 1 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which additionally comprises：One output needle stand, on the substrate, which couples an output terminal of the operational amplifier.
- 13. it is according to claim 12 for detaching the electronic device of stratum electric potential signal and measurement circuit noise, it is special Sign is that the electronic device additionally comprises：One second resistance, between the output needle stand and the output terminal.
- 14. the electronic device according to claim 1 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which additionally comprises：One 3rd resistor, one end of the 3rd resistor connect a non-inverting input of the operational amplifier, the 3rd resistor The other end is grounded.
- 15. the electronic device according to claim 1 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which additionally comprises：One the 4th resistance, between an output terminal and an inverting input for the operational amplifier.
- 16. it is according to claim 15 for detaching the electronic device of stratum electric potential signal and measurement circuit noise, it is special Sign is that the electronic device additionally comprises：One the 5th resistance, between output terminal and the inverting input of the operational amplifier.
- 17. it is according to claim 16 for detaching the electronic device of stratum electric potential signal and measurement circuit noise, it is special Sign is that the electronic device additionally comprises：One line selector between output terminal and the inverting input of the operational amplifier, connects the 4th respectively Resistance and the 5th resistance.
- 18. it is according to claim 16 for detaching the electronic device of stratum electric potential signal and measurement circuit noise, it is special Sign is that the resistance value of the 4th resistance or the 5th resistance is more than the resistance value of a first resistor.
- 19. it is according to claim 16 for detaching the electronic device of stratum electric potential signal and measurement circuit noise, it is special Sign is that the resistance value of the 4th resistance is more than the resistance value of the 5th resistance.
- 20. the electronic device according to claim 1 for being used to detach stratum electric potential signal and measurement circuit noise, feature It is, which is a printed circuit board.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW105141243A TW201821829A (en) | 2016-12-13 | 2016-12-13 | Electronic device for separating potential signals of stratum and noises of measurement circuit |
| TW105141243 | 2016-12-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108226225A true CN108226225A (en) | 2018-06-29 |
Family
ID=62651450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611161705.7A Withdrawn CN108226225A (en) | 2016-12-13 | 2016-12-15 | Electronic device for separating formation potential signal and measuring circuit noise |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108226225A (en) |
| TW (1) | TW201821829A (en) |
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| CN201646441U (en) * | 2010-03-25 | 2010-11-24 | 中国矿业大学 | Track potential limiting device |
| CN102520031A (en) * | 2011-10-25 | 2012-06-27 | 杭州电子科技大学 | Detection circuit of dissolved oxygen in water |
| CN102931935A (en) * | 2012-11-26 | 2013-02-13 | 昆山北极光电子科技有限公司 | Low-cost program-controlled amplification circuit |
| CN103117735A (en) * | 2013-01-31 | 2013-05-22 | 杭州电子科技大学 | Periodic pulse width/voltage signal multifunctional precise converting switch |
| CN103437761A (en) * | 2013-09-06 | 2013-12-11 | 北京环鼎科技有限责任公司 | Hard electrode combined logging instrument for logging drill well |
| CN103471726A (en) * | 2013-08-28 | 2013-12-25 | 西安应用光学研究所 | Femtojoule level nanosecond pulse laser energy detection device |
| CN204794912U (en) * | 2015-07-07 | 2015-11-18 | 昆明理工大学 | Real -time modulate circuit of industrial control system small -signal |
| CN205195953U (en) * | 2015-07-28 | 2016-04-27 | 东莞市东源音响灯光工程有限公司 | Noise suppression disturbs audio circuit |
-
2016
- 2016-12-13 TW TW105141243A patent/TW201821829A/en unknown
- 2016-12-15 CN CN201611161705.7A patent/CN108226225A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201646441U (en) * | 2010-03-25 | 2010-11-24 | 中国矿业大学 | Track potential limiting device |
| CN102520031A (en) * | 2011-10-25 | 2012-06-27 | 杭州电子科技大学 | Detection circuit of dissolved oxygen in water |
| CN102931935A (en) * | 2012-11-26 | 2013-02-13 | 昆山北极光电子科技有限公司 | Low-cost program-controlled amplification circuit |
| CN103117735A (en) * | 2013-01-31 | 2013-05-22 | 杭州电子科技大学 | Periodic pulse width/voltage signal multifunctional precise converting switch |
| CN103471726A (en) * | 2013-08-28 | 2013-12-25 | 西安应用光学研究所 | Femtojoule level nanosecond pulse laser energy detection device |
| CN103437761A (en) * | 2013-09-06 | 2013-12-11 | 北京环鼎科技有限责任公司 | Hard electrode combined logging instrument for logging drill well |
| CN204794912U (en) * | 2015-07-07 | 2015-11-18 | 昆明理工大学 | Real -time modulate circuit of industrial control system small -signal |
| CN205195953U (en) * | 2015-07-28 | 2016-04-27 | 东莞市东源音响灯光工程有限公司 | Noise suppression disturbs audio circuit |
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| Publication number | Publication date |
|---|---|
| TW201821829A (en) | 2018-06-16 |
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Application publication date: 20180629 |
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