CN106093473A - A kind of Pt Ir needle point corrosion device and method of work thereof - Google Patents
A kind of Pt Ir needle point corrosion device and method of work thereof Download PDFInfo
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- G01Q—SCANNING-PROBE TECHNIQUES OR APPARATUS; APPLICATIONS OF SCANNING-PROBE TECHNIQUES, e.g. SCANNING PROBE MICROSCOPY [SPM]
- G01Q60/00—Particular types of SPM [Scanning Probe Microscopy] or microscopes; Essential components thereof
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Abstract
The invention discloses a kind of Pt Ir needle point corrosion device and method of work thereof, including mechanical component, operating circuit and automatic circuit control system；Described automatic circuit control system includes that AC signal generation module, ac voltage signal collection and amplification module, ac voltage signal virtual value are extracted and display circuit, ac current signal acquisition module, ac current signal absolute value processing circuit, AC-DC conversion and display circuit, threshold value setting module, sampled signal comparison circuit module, signal processing power module and power switch unit.The present invention is loaded with ac current signal absolute value processing circuit in automatic circuit control system, ac current signal is converted into the d. c. voltage signal that can directly observe, it is compared by sampled signal comparison circuit module with preset value, determines the action of power switch unit.During making Pt Ir needle point according to the method for the present invention, never found the Pt Ir tinsel of fracture in beaker bottom.
Description
Technical field
The present invention relates to the manufacturing technology of PSTM, the Pt-Ir (platinum of a kind of PSTM
Iridium) producing device of needle point.
Background technology
PSTM is the Surface Science research means that a kind of resolution is high.It is scanned into as to sample surfaces
The direct parts of picture, needle point plays important role, and strong influence in PSTM work process
The quality of imaging and the stability of operation.
Owing to the d electronic state of sophisticated atomic is obtained in that higher lateral resolution, W (tungsten) and Pt-Ir (platinoiridita) are mesh
Front two kinds of the most frequently used tip point material.Comparatively speaking, W needle point is easier to be corroded so typically using under vacuum conditions, and
Pt and Ir is noble metal and is difficult to oxidized, and chemical property is more stable, may be used under atmospheric environment, and additionally Pt is softer,
Add Ir to increase hardness to make it be difficult to damaged.
Both materials, W is harder and crisp, generally uses unidirectional current (DC) caustic solution and is processed.Pt-Ir is softer,
Both cutting method can have been used can also to make of alternating current (AC) caustic solution, specifically used which kind of method, depend on by
Environment to be applied.Such as, due to the release of stress, the needle point profile of shearing is coarse, typically can form the small of multiple projection
Tip, is used for the scanning of flat surfaces, and the needle surface more rule that chemical corrosion method makes may be used for rougher
Surface scan.
The research in presently relevant field is concentrated mainly on circuit exploitation, corrosion device improves and response parameter is for corrosion
Effect affect three aspects.In order to obtain more sharp-pointed needle point, most design needs the auxiliary of automatic control circuit.
Chinese patent CN 201410836854.3 discloses a kind of needle tip of scanning tunnel microscope corrosion tester, this corrosion tester
Including mechanical component, operating circuit and control power supply.Control power supply and include control circuit and control panel.Control circuit includes adjusting
Pressure Voltage stabilizing module, voltage measurement module, current measurement module, threshold value setting module, sampling comparison module and voltage output module,
Used by voltage-regulation voltage-stabilization module, sampling resistor R2 is positioned at high potential, and sampling comparison module uses LM319 type comparator.Due to this corruption
Lose control circuit designed by instrument by the sampling resistor in conventional needle point corrosion tester control circuit from whole load voltage acquisition system
In remove, change at high potential, can accurately measure real-time current by such mode, simultaneously proof load resistance two ends
Constant voltage exports, and electric current is gradually reduced along with the increase of load resistance, and the change of such Radix Salviae Miltiorrhizae amount is to be easily controlled and analyze
, enhance the stability of corrosion process, thus improve the success rate that needle point makes.
But, there is a certain partial reaction and comparatively fast cause wire breakage in this corrosion tester in corrosion process, therefore only
DC corrosion method can be used to make W needle point, it is impossible to the corrosion for Pt-Ir needle point makes.
Summary of the invention
For solving the problems referred to above that prior art exists, the present invention to design one and not result in a certain in corrosion process
Partial reaction is very fast and causes Pt-Ir needle point corrosion device and the method for work thereof of wire breakage.
To achieve these goals, technical scheme is as follows: a kind of Pt-Ir needle point corrosion device, including machinery
Assembly, operating circuit and automatic circuit control system；
Described mechanical component includes that base, support, upper cover, top cover knob, copper sheathing A, threaded rod, pointer, lifting are fixed
Block, anode electrode bar, fixed knob, electrode fix end, three-jaw fixture A, knob, three-jaw fixture B, cathode electrode bar, disk, stone
Electrode ink ring, beaker and copper sheathing B.
It is fixing that described base uses screw to be connected with support, disk respectively, plays overall supporting role；Described upper cover with
It is fixing that support uses screw to connect；Described threaded rod two ends are divided with copper sheathing A and copper sheathing B matched in clearance, copper sheathing A and copper sheathing B respectively
It is not fixed on upper cover and base；Described top cover knob is marked with scale, uses screw to be fastenedly connected with threaded rod；Described pointer
Being fixed by screws in and cover, it coordinates the scale on top cover knob to determine the anglec of rotation of top cover knob.Described electrode is solid
Fixed end is fixed by screws on lifting fixed block, is threaded engagement between fixed knob and the fixing end of electrode, anode electrode bar
It is fixed on the fixing end of electrode by fixed knob；Described three-jaw fixture A and three-jaw fixture B is fixed by screws in anode respectively
On electrode stem, three-jaw fixture A and three-jaw fixture B is by tungsten filament vertical clamping；Described cathode electrode bar uses screw to be fixed on base
On, knob and cathode electrode bar threaded engagement, electrode retaining collar is fixedly clamped on cathode electrode bar by rotary knob；Described disk is adopted
Being screwed on base, the beaker filling etchant solution is placed among the circular hole of disk, and the electrode retaining collar beaker that submerges is contained molten
Below liquid liquid level；Described etchant solution is CaCl2, HCl and the mixed solution of acetone；Set between described beaker and disk
Put vibration damper plate；
Described operating circuit includes that anode electrode bar, electrode fix end, three-jaw fixture A, knob, three-jaw fixture B, negative electrode
Etchant solution in electrode stem, disk, graphite electrode ring and beaker；The fixing end of electrode connects positive source by electric wire, and electric current leads to
Crossing to fix with electrode holds the anode electrode bar being connected to be transmitted to the Pt-Ir silk clamped by three-jaw fixture A and three-jaw fixture B；Described
Cathode electrode bar connects power cathode, and is connected by screw with graphite electrode ring；Clamped by three-jaw fixture A and three-jaw fixture B
Pt-Ir silk and graphite electrode ring are co-located in the etchant solution that beaker is contained, but Pt-Ir silk the most directly connects with graphite electrode ring
Touching, during energising, Pt-Ir silk occurs cell reaction to constitute circuit loop in etchant solution.
Described automatic circuit control system includes AC signal generation module, ac voltage signal collection and amplifies mould
Block, ac voltage signal virtual value are extracted and at display circuit, ac current signal acquisition module, ac current signal absolute value
Reason circuit, AC-DC conversion and display circuit, threshold value setting module, sampled signal comparison circuit module, signal processing power supply mould
Block and power switch unit, described AC signal generation module is connected with ac voltage signal collection and amplification module, described
Ac voltage signal collection and amplification module respectively with ac voltage signal virtual value extract and display circuit, alternating current letter
Number acquisition module and anode electrode bar connect, described ac current signal acquisition module successively with ac current signal absolute value
Processing circuit, AC-DC conversion and display circuit and sampled signal comparison circuit module connects, described sampled signal is more electric
Road module is connected with threshold value setting module and power switch unit respectively, described power switch unit and cathode electrode bar and stone
Electrode ink ring connects.
Further, described vibration damper plate thickness is 20-30mm.
The method of work of a kind of Pt-Ir needle point corrosion device, comprises the following steps:
A, by the ac voltage signal collection of automatic circuit control system and amplification module and power switch unit respectively with
Anode electrode bar and cathode electrode bar connect, and beaker fills etchant solution and is positioned on the vibration damper plate of disk, and by top
Lid knob regulation Pt-Ir silk immerses the degree of depth of etchant solution；
B, AC signal generation module produce one group of AC signal, and AC signal is continuous print or pulsed, frequency and
Adjustable amplitude, reload after ac voltage signal collection and amplification module amplify anode electrode bar and cathode electrode bar it
Between；Meanwhile, ac voltage signal virtual value is extracted and display circuit carries out virtual value extraction to the voltage signal after amplifying and shows
Show, the AC signal voltage effective value exported by show value acquisition ac voltage signal collection and amplification module；
C, ac current signal absolute value processing circuit gather the exchange after amplification module amplifies to through ac voltage signal
After signal is acquired and makees absolute value process, it is transported to AC-DC conversion and display circuit；AC-DC conversion and display circuit
On the one hand sampled signal comparison circuit module and the threshold set by threshold value setting module are passed through after AC signal is converted to direct current
Value compares, again by controlling power switch unit after comparing；On the other hand display AC electric signal absolute value processes electricity
Size of current after the process of road is to judge Pt-Ir silk needle point corrosion process；
D, compared with the threshold value set by threshold value setting module by sampled signal comparison circuit module, work as alternating current
When electric current after stream signal absolute value processing circuit process reaches the current value that threshold value setting module is arranged, corrosion terminates.
Compared with prior art, the method have the advantages that
1, for the ease of monitoring, the present invention is loaded with ac current signal absolute value in automatic circuit control system and processes electricity
Road (is similar to the parts of commutator), and ac current signal is converted into the d. c. voltage signal that can directly observe, sampling letter
It is compared by number comparison circuit module with preset value, determines the action of power switch unit.
2, traditional automatic circuit control system is general all carrys out control circuit switch with relay, and shortcoming is automatic reaction
Speed is slow, and the present invention uses the sensitiveest electrical switch, i.e. power switch unit, its function is about as much as a parallel connection
Bi-directional MOS pipe, response speed, in 100ns magnitude, can control the break-make that alternating current is two-way simultaneously.
3, during making Pt-Ir needle point according to the method for the present invention, the Pt-of fracture was never found in beaker bottom
Ir tinsel (even if the Pt-Ir filament length immersing solution reaches 1.5mm, also do not find phenomenon of rupture), meanwhile, alternating current caustic solution
Corrosion Pt-Ir silk is the most much the same in the response speed along major axis (X-axis) direction each several part, will not corrode as W needle point
Equally there is a certain partial reaction and comparatively fast cause wire breakage in process, but owing to top exists sharp-pointed part, electric-field strength
Degree is relatively strong, and corrosion efficiency is very fast (along Y-axis), defines satisfactory tip.And As time goes on, immerse in solution
Length is gradually shortened, and eventually disengages from liquid level, and reaction stops.
Accompanying drawing explanation
Fig. 1 is the mechanical component structural representation of the present invention.
Fig. 2 is the automatic circuit control system composition schematic diagram of the present invention.
Fig. 3 is the workflow schematic diagram of the present invention.
Fig. 4 is the needle point effect schematic diagram that the present invention makes.
In figure: 1, base；2, support；3, upper cover；4, top cover knob；5, copper sheathing A；6, threaded rod；7, pointer；8, lifting is solid
Determine block；9, anode electrode bar；10, fixed knob；11, the fixing end of electrode；12, three-jaw fixture A；13, knob；14, three-jaw fixture
B；15, cathode electrode bar；16, disk；17, graphite electrode ring；18, beaker；19, copper sheathing B.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described through.As Figure 1-3, a kind of Pt-Ir needle point corrosion dress
Put, including mechanical component, operating circuit and automatic circuit control system；
Described mechanical component include base 1, support 2, upper cover 3, top cover knob 134, copper sheathing A5, threaded rod 6, pointer 7,
Lifting fixed block 8, anode electrode bar 9, fixed knob 10, electrode fix end 11, three-jaw fixture A12, knob 13, three-jaw fixture
B14, cathode electrode bar 15, disk 16, graphite electrode ring 17, beaker 18 and copper sheathing B19.
It is fixing that described base 1 uses screw to be connected respectively with support 2, disk 16, plays overall supporting role；On described
It is fixing that lid 3 uses screw to be connected with support 2；Described threaded rod 6 two ends respectively with copper sheathing A5 and copper sheathing B19 matched in clearance, copper sheathing
A5 and copper sheathing B19 is separately fixed on upper cover 3 and base 1；Described top cover knob 134 is marked with scale, uses screw and screw thread
Bar 6 is fastenedly connected；Described pointer 7 is fixed by screws on upper cover 3, and it coordinates the scale on top cover knob 134 to determine top cover
The anglec of rotation of knob 134.The fixing end 11 of described electrode is fixed by screws on lifting fixed block 8, fixed knob 10 and electricity
Being threaded engagement between extremely fixing end 11, anode electrode bar 9 is fixed on the fixing end 11 of electrode by fixed knob 10；Described three
Pawl fixture A12 and three-jaw fixture B14 is fixed by screws on anode electrode bar 9 respectively, three-jaw fixture A12 and three-jaw fixture
B14 is by tungsten filament vertical clamping；Described cathode electrode bar 15 uses screw to be fixed on base 1, knob 13 and cathode electrode bar 15
Threaded engagement, electrode retaining collar is fixedly clamped on cathode electrode bar 15 by rotary knob 13；Described disk 16 uses screw to be fixed on
On base 1, the beaker 18 filling etchant solution is placed among the circular hole of disk 16, and electrode retaining collar submerges the contained liquid level of solution of beaker 18
Below；Described etchant solution is CaCl2, HCl and the mixed solution of acetone；Arrange between described beaker 18 and disk 16
Vibration damper plate；
Described operating circuit includes that anode electrode bar 9, electrode fix end 11, three-jaw fixture A12, knob 13, three-jaw card
Etchant solution in tool B14, cathode electrode bar 15, disk 16, graphite electrode ring 17 and beaker 18；The fixing end 11 of electrode is by electricity
Line connects positive source, and the anode electrode bar 9 that electric current is connected by fixing end 11 with electrode is transmitted to three-jaw fixture A12 and three-jaw card
Tool Pt-Ir silk clamped by B14；Described cathode electrode bar 15 connects power cathode, and is connected by screw with graphite electrode ring 17；
Pt-Ir silk clamped by three-jaw fixture A12 and three-jaw fixture B14 and graphite electrode ring 17 are co-located on the corrosion that beaker 18 is contained
In solution, but Pt-Ir silk is not directly contacted with graphite electrode ring 17, and during energising, Pt-Ir silk occurs electrolysis anti-in etchant solution
Circuit loop should be constituted.
Described automatic circuit control system includes AC signal generation module, ac voltage signal collection and amplifies mould
Block, ac voltage signal virtual value are extracted and at display circuit, ac current signal acquisition module, ac current signal absolute value
Reason circuit, AC-DC conversion and display circuit, threshold value setting module, sampled signal comparison circuit module, signal processing power supply mould
Block and power switch unit, described AC signal generation module is connected with ac voltage signal collection and amplification module, described
Ac voltage signal collection and amplification module respectively with ac voltage signal virtual value extract and display circuit, alternating current letter
Number acquisition module and anode electrode bar 9 connect, and described ac current signal acquisition module is absolute with ac current signal successively
Value processes circuit, AC-DC conversion and display circuit and sampled signal comparison circuit module connects, and described sampled signal compares
Circuit module is connected with threshold value setting module and power switch unit respectively, described power switch unit and cathode electrode bar 15
Connect with graphite electrode ring 17.
Further, described vibration damper plate thickness is 20-30mm.
The method of work of a kind of Pt-Ir needle point corrosion device, comprises the following steps:
A, by the ac voltage signal collection of automatic circuit control system and amplification module and power switch unit respectively with
Anode electrode bar 9 and cathode electrode bar 15 connect, beaker 18 is filled etchant solution and be positioned over disk 16 vibration damper plate on, and
Regulate Pt-Ir silk by top cover knob 134 and immerse the degree of depth of etchant solution；
B, AC signal generation module produce one group of AC signal, and AC signal is continuous print or pulsed, frequency and
Adjustable amplitude, reloads anode electrode bar 9 and cathode electrode bar after ac voltage signal collection and amplification module are amplified
Between 15；Meanwhile, ac voltage signal virtual value is extracted and display circuit carries out virtual value extraction to the voltage signal after amplifying
And show, the AC signal voltage effective value exported by show value acquisition ac voltage signal collection and amplification module；
C, ac current signal absolute value processing circuit gather the exchange after amplification module amplifies to through ac voltage signal
After signal is acquired and makees absolute value process, it is transported to AC-DC conversion and display circuit；AC-DC conversion and display circuit
On the one hand sampled signal comparison circuit module and the threshold set by threshold value setting module are passed through after AC signal is converted to direct current
Value compares, again by controlling power switch unit after comparing；On the other hand display AC electric signal absolute value processes electricity
Size of current after the process of road is to judge Pt-Ir silk needle point corrosion process；
D, compared with the threshold value set by threshold value setting module by sampled signal comparison circuit module, work as alternating current
When electric current after stream signal absolute value processing circuit process reaches the current value that threshold value setting module is arranged, corrosion terminates.
Below in conjunction with Fig. 4, the corrosive effect of the present invention is further described: in the corrosion process of W needle point, reaction
The highest region of efficiency is close to solution surface, and therefore W silk can break to form needle point in this place, and the needle point profile formed is hyperbolic
Type, drops in the electrolytic solution in the latter half after fracture.Experiment is also found that the most tiny W in beaker bottom really
Silk.But, in the manufacturing process of Pt-Ir silk, never found that the Pt-Ir silk of fracture was (even if immersing solution in beaker bottom
Pt-Ir filament length reach 1.5mm, do not find phenomenon of rupture yet), the image in Fig. 4 lower left corner be respectively W silk and Pt-Ir silk corrosion after
Shape contrast.
Pt-Ir silk shape of needle point after the corrosion through 10 minutes to 70 minutes 7 time periods is listed on the right side of Fig. 4,
These needle point images show, use alternating current method corrosion Pt-Ir silk real in the response speed along major axis (X-axis) direction each several part
It is much the same on border, a certain partial reaction will not be there is as W needle point corrosion process and comparatively fast cause wire breakage, but
Owing to top exists sharp-pointed part, electric field intensity is relatively strong, and corrosion efficiency is very fast (along Y-axis), defines the tip of needs.And with
The passage of time, the length immersed in solution is gradually shortened, and eventually disengages from liquid level, and reaction stops, outside the needle point tip of formation
Sigmoid curves is parabolic type.In current experiment, Pt-Ir silk top is the strongest due to electric field, and corrosion is the fastest, first removes sharp-pointed
Top becomes round and smooth arc, and simultaneously along with the prolongation in response time, the wire length in solution the most gradually shortens, more gradually
Needle point required for formation is most advanced and sophisticated.
When Pt-Ir silk initially immerses a length of 0.5mm, by threshold value setting module set cut-off kinetic current as
40mA.This numerical value is obtained by test repeatedly, it is ensured that obtain the shape that preferable needle point is most advanced and sophisticated with this understanding.
If the cut-off kinetic current of automatic shutdown circuit is bigger, it is possible to cause needle point tip not formed, such as in Fig. 4 30 minutes
Situation, cut-off current arranges slightly smaller, may be not too large on the shape impact that needle point is most advanced and sophisticated, but corrosion process is just
The extremely long time can be consumed, also lose more than gain.
The present invention is not limited to the present embodiment, any equivalent concepts in the technical scope of present disclosure or change
Become, be all classified as protection scope of the present invention.
Claims (3)
1. a Pt-Ir needle point corrosion device, it is characterised in that: include that mechanical component, operating circuit and automatic circuit control system
System；
Described mechanical component includes base (1), support (2), upper cover (3), top cover knob (13) (4), copper sheathing A (5), threaded rod
(6), pointer (7), lifting fixed block (8), anode electrode bar (9), fixed knob (10), electrode fixing end (11), three-jaw fixture A
(12), knob (13), three-jaw fixture B (14), cathode electrode bar (15), disk (16), graphite electrode ring (17), beaker (18) and
Copper sheathing B (19)；
It is fixing that described base (1) uses screw to be connected with support (2), disk (16) respectively, plays overall supporting role；Described
It is fixing that upper cover (3) uses screw to be connected with support (2)；Described threaded rod (6) two ends are respectively and between copper sheathing A (5) and copper sheathing B (19)
Gap coordinates, and copper sheathing A (5) and copper sheathing B (19) is separately fixed on upper cover (3) and base (1)；On described top cover knob (13) (4)
Indicate scale, use screw to be fastenedly connected with threaded rod (6)；Described pointer (7) is fixed by screws on upper cover (3), and it is joined
Close the scale on top cover knob (13) (4) and determine the anglec of rotation of top cover knob (13) (4)；The fixing end (11) of described electrode is passed through
Screw is fixed in lifting fixed block (8), is threaded engagement between fixed knob (10) and the fixing end (11) of electrode, anode electrode
Bar (9) is fixed on the fixing end (11) of electrode by fixed knob (10)；Described three-jaw fixture A (12) and three-jaw fixture B (14)
Being fixed by screws in respectively on anode electrode bar (9), three-jaw fixture A (12) and three-jaw fixture B (14) are by tungsten filament vertical clamping；
Described cathode electrode bar (15) uses screw to be fixed on base (1), knob (13) and cathode electrode bar (15) threaded engagement, rotation
Rotate button (13) to be fixedly clamped by electrode retaining collar on cathode electrode bar (15)；Described disk (16) uses screw to be fixed on base
(1) on, the beaker (18) filling etchant solution is placed among the circular hole of disk (16), and electrode retaining collar submerges beaker (18) contained solution
Below liquid level；Described etchant solution is CaCl2, HCl and the mixed solution of acetone；Described beaker (18) and disk (16)
Between vibration damper plate is set；
Described operating circuit include anode electrode bar (9), electrode fixing end (11), three-jaw fixture A (12), knob (13), three
Etchant solution in pawl fixture B (14), cathode electrode bar (15), disk (16), graphite electrode ring (17) and beaker (18)；Electrode
Fixing end (11) connects positive source by electric wire, and the anode electrode bar (9) that electric current is connected by end (11) fixing with electrode conducts
To the Pt-Ir silk clamped by three-jaw fixture A (12) and three-jaw fixture B (14)；Described cathode electrode bar (15) connects power cathode, and
It is connected by screw with graphite electrode ring (17)；Pt-Ir silk clamped by three-jaw fixture A (12) and three-jaw fixture B (14) and stone
Electrode ink ring (17) is co-located in the etchant solution that beaker (18) is contained, but Pt-Ir silk is the most direct with graphite electrode ring (17)
Contact, during energising, Pt-Ir silk occurs cell reaction to constitute circuit loop in etchant solution；
Described automatic circuit control system includes AC signal generation module, ac voltage signal collection and amplification module, friendship
Stream voltage signal virtual value extracts and display circuit, ac current signal acquisition module, ac current signal absolute value process electricity
Road, AC-DC conversion and display circuit, threshold value setting module, sampled signal comparison circuit module, signal processing power module and
Power switch unit, described AC signal generation module is connected with ac voltage signal collection and amplification module, described friendship
Stream voltage signal acquisition and amplification module extract with ac voltage signal virtual value respectively and display circuit, ac current signal are adopted
Collection module and anode electrode bar (9) connect, described ac current signal acquisition module successively with ac current signal absolute value
Processing circuit, AC-DC conversion and display circuit and sampled signal comparison circuit module connects, described sampled signal is more electric
Road module is connected with threshold value setting module and power switch unit respectively, described power switch unit and cathode electrode bar (15)
Connect with graphite electrode ring (17).
A kind of Pt-Ir needle point corrosion device the most according to claim 1, it is characterised in that: described vibration damper plate thickness is
20-30mm。
3. the method for work of a Pt-Ir needle point corrosion device, it is characterised in that: comprise the following steps:
A, by the ac voltage signal collection of automatic circuit control system and amplification module and power switch unit respectively with anode
Electrode stem (9) and cathode electrode bar (15) connect, and beaker (18) is filled etchant solution and is positioned over the vibration damper plate of disk (16)
On, and the degree of depth of etchant solution is immersed by top cover knob (13) (4) regulation Pt-Ir silk；
B, AC signal generation module produce one group of AC signal, and AC signal is continuous print or pulsed, frequency and amplitude
Adjustable, after ac voltage signal collection and amplification module are amplified, reload anode electrode bar (9) and cathode electrode bar
(15) between；Meanwhile, ac voltage signal virtual value is extracted and display circuit carries out virtual value to the voltage signal after amplifying and carries
Take and show, the AC signal voltage effective value exported by show value acquisition ac voltage signal collection and amplification module；
C, ac current signal absolute value processing circuit gather the AC signal after amplification module amplifies to through ac voltage signal
After being acquired and making absolute value process, it is transported to AC-DC conversion and display circuit；AC-DC conversion and display circuit one side
Face is entered with the threshold value set by threshold value setting module by sampled signal comparison circuit module after AC signal is converted to direct current
Row compares, again by controlling power switch unit after comparing；On the other hand at display AC electric signal absolute value processing circuit
Size of current after reason is to judge Pt-Ir silk needle point corrosion process；
D, compared with the threshold value set by threshold value setting module by sampled signal comparison circuit module, when alternating current is believed
Number absolute value processing circuit process after electric current when reaching the current value that threshold value setting module is arranged, corrosion terminates.
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| CN101692100A (en) * | 2009-10-09 | 2010-04-07 | 南京大学 | Method and device for preparing pinpoint of scanning tunnel microscope (STM) |
| CN104101738A (en) * | 2014-07-10 | 2014-10-15 | 华中科技大学 | Preparation device and preparation method of nanometer probe controllable and large in length to diameter ratio |
| CN104483512A (en) * | 2014-12-29 | 2015-04-01 | 大连交通大学 | Scanning tunneling microscope needle point corrosion instrument |
| CN206002561U (en) * | 2016-07-27 | 2017-03-08 | 大连交通大学 | A kind of Pt Ir needle point corrosion device |
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