CN101558291B - Emission analyzer - Google Patents
Emission analyzer Download PDFInfo
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- CN101558291B CN101558291B CN2006800566272A CN200680056627A CN101558291B CN 101558291 B CN101558291 B CN 101558291B CN 2006800566272 A CN2006800566272 A CN 2006800566272A CN 200680056627 A CN200680056627 A CN 200680056627A CN 101558291 B CN101558291 B CN 101558291B
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- 238000007600 charging Methods 0.000 claims abstract description 58
- 239000003990 capacitor Substances 0.000 claims abstract description 57
- 238000012360 testing method Methods 0.000 claims description 18
- 238000004458 analytical method Methods 0.000 abstract description 6
- 230000005415 magnetization Effects 0.000 description 14
- 239000002184 metal Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/66—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light electrically excited, e.g. electroluminescence
- G01N21/67—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light electrically excited, e.g. electroluminescence using electric arcs or discharges
Abstract
The invetion relates to an emission ananlyzer. After a switching element (13) is turned on, a charge control section (16) makes a decision whether a current detected at an exciting current detecting section (15) has reached a predetermined level or not, and turns the switching element (13) off if the predetermined level has been reached. When the exciting current is controlled to a constant level,exciting energy stored in a flyback transformer (12) also becomes constant and that constant energy is stored in a capacitor (22) every time when the switching element (13) is turned off. A charge control section (16) repeats the on/off operation of the switching element (13) by a predetermined number of times at a predetermined interval before stopping the charging operation. Consequently, a constant energy is held in the capacitor (22) when the charging operation stops and the time from the start to the end of charging also becomes constant. Conditions for repeating spark discharge are thereby satisfied and an analysis precision and reproducibility are enhanced.
Description
Technical field
The present invention relates to utilize the apparatus for analyzing luminosity of spark discharge.
Background technology
In the apparatus for analyzing luminosity of spark discharge type, the energy of capacitor savings is given and sparking electrode, thereby between this electrode and metal test portion, produced spark discharge, make the elements vaporization in the metal test portion, also utilize discharge plasma to excite this element simultaneously.Because the element that excites in plasma is luminous with distinctive wavelength,, can carry out quantitatively this element so this light that sends is carried out measuring after the beam split light intensity of this wavelength.In addition, contain element when not clear, obtain the luminescent spectrum of provision wavelengths scope, behind the wavelength that the investigation line spectrum exists, can also carry out qualitative analysis.In general,, carry out spark discharge repeatedly, to adding up to handle, so that improve measuring accuracy with each light value that obtains accordingly that discharges with the cycle about tens～hundreds of Hz.
In this apparatus for analyzing luminosity, in order to carry out spark discharge, need be in the relatively shorter time.Charge the capacitor to the voltage about hundreds of V.Therefore, in recent years, the capacitator charging circuit of on-off mode was extensively utilized (for example with reference to patent documentation 1).Fig. 3 is the frame assumption diagram of apparatus for analyzing luminosity of capacitator charging circuit of the use on-off mode of prior art.
In this apparatus for analyzing luminosity, illuminating part is made of capacitator charging circuit 1, capacitor circuit 2, ignitor circuit 3 and luminous seat 4.Capacitator charging circuit 1, comprise direct supply 11, have primary coil and secondary coil on-off element 13 such as kickback transformer 12, FET, drive the charging control section 14 of this on-off element 13.Capacitor circuit 2, the discharge of comprise commutation diode 21, putting aside electric energy for discharge is with capacitor 22 and detect the charging voltage detecting element 23 of discharge with the charging voltage of capacitor 22.Ignitor circuit 3 comprises the lighter transformer 31 with primary coil and secondary coil and is intended to make the secondary coil of lighter transformer 31 to produce high-tension lighter drive division 32.In addition, luminous seat 4 comprises sparking electrode 41 and analyte---test portion (being generally metal) 42.
In capacitator charging circuit 1, the primary coil of kickback transformer 12 and on-off element 13, connect with the two ends of direct supply 11, under the effect of charging control section 14, after on-off element 13 is connected (conducting), DC current just flows into the primary coil of kickback transformer 12, makes kickback transformer 12 savings magnetization energy.14 of charging control section are connected on-off element 13 in the time of predesignating, and when on-off element 13 is disconnected, produce back electromotive force in the secondary coil of kickback transformer 12.Like this, the magnetization energy of being put aside by kickback transformer 12 by commutation diode 21, was supplied with discharge with capacitor 22 just in capacitor circuit 2 just now, making discharge with capacitor 22 chargings.
The on on-off element 13 as illustrated in fig. 3, and during on-off element 13 each disconnections, under the effect of the magnetization energy of being put aside by kickback transformer 12 just now, discharge is risen with the charging voltage step-like ground of capacitor 22.Charging voltage detecting element 23 monitors the charging voltage of discharge with capacitor 22, and charging control section 14 judges according to this monitoring value whether charging voltage surpasses assigned voltage V1.Till charging voltage surpassed assigned voltage V1, charging control section 14 was carried out the on of on-off element 13 repeatedly, when charging voltage surpasses assigned voltage V1, and the ON Action of shutdown switch element 13, charging with capacitor 22 stops to discharge.
Like this because charging finishes, so later in ignitor circuit 3, under the effect of lighter drive division 32, produce high voltage in the lighter transformer 31 after, between sparking electrode 41 and metal test portion 42, just produce spark discharge.At this moment, the surface local ground of metal test portion 42 becomes high temperature, and the element that the surface of this metal test portion 42 exists is evaporated.Meanwhile, the energy of being put aside by kickback transformer 12 (gap) between sparking electrode 41 and metal test portion 42 moves, and forms plasma, and the element of above-mentioned evaporation is by the electron excitation in the plasma.Then, when the element that is excited recovers stable status, send the light of the wavelength that is equivalent to its energy difference.The photometric measurer 5 that comprises optical splitter and optical detector etc., measurement has the luminous of the distinctive wavelength of this element, collects the information that contains element of relevant metal test portion 42.
In sum, in the capacitator charging circuit 1 of the use on-off mode of prior art, adopt discharge to surpass and just stop the method for charging behind the assigned voltage V1, at the electric energy of discharge with savings necessity in the capacitor 22 with the charging voltage of capacitor 22.
, in above-mentioned the sort of capacitator charging circuit 1, exist following problems.In other words, because the time of connection on-off element 13 is certain, so behind the variation in voltage of direct supply 11, the amount of savings of the magnetization energy of gauge tap element 13 in each on/off action will change.In addition, its electrostatic capacitance discharge with the effect of the temperature rising of capacitor 22 etc. under and change.Like this, the amount of savings of the magnetization energy in the kickback transformer 12 and discharge with the change of the electrostatic capacitance of capacitor 22 after, being charged to the number of times that the on/off of on-off element 13 required till certain certain voltage V1 moves in order discharge with capacitor 22 will change.So as shown in Figure 5, discharging surpasses the moment generation deviation of threshold voltage V1 with the charging voltage of capacitor 22, the discharge when stopping to charge is equivalent to the deviation of the voltage of 13 on/off actions of on-off element with the maximum generation of the charging voltage of capacitor 22.Like this, discharge changes with the energy of capacitor 22 savings.
In addition, since stop to put the control of charging with discharge with the monitoring value of the charging voltage of capacitor 22, so as mentioned above, after discharge changes with capacitor 22 electrostatic capacitances own, even final charging voltage is certain, this discharge also will change with the energy that capacitor 22 keeps.
When carrying out spark discharge, if the energy of discharge usefulness capacitor 22 savings not necessarily, the generation state of plasma will change when discharging so.Like this, even the amount of element that metal test portion 42 comprises is certain, luminous intensity also will produce deviation, and it might become the reason of analysis precision and repeatability decline.
Patent documentation 1:JP spy open the 2004-333323 communique (paragraph 0004-0007, Fig. 5)
In other words, in the apparatus for analyzing luminosity of spark discharge type, although in order to improve analysis precision and repeatability, the energy of the capacitor savings that is about to discharge keep become necessarily most important, but in one type of prior art syringe, but be difficult to this energy keep become certain.
Summary of the invention the present invention develops at above-mentioned situation, its purpose be to provide improve be intended to produce the discharge of spark discharge with the stability of the energy of capacitor savings, make the purpose element be accompanied by the apparatus for analyzing luminosity of the luminous stabilization of discharge.
In order to achieve the above object, apparatus for analyzing luminosity of the present invention, it is characterized in that: in the apparatus for analyzing luminosity that possesses sparking electrode (being disposed with predetermined gap between this sparking electrode and the test portion), ignitor circuit (this ignitor circuit is connected with above-mentioned sparking electrode), capacitor (electric energy of this capacitor savings discharge usefulness), capacitator charging circuit (this capacitator charging circuit charges above-mentioned capacitor), described capacitator charging circuit possesses: a) direct supply; B) kickback transformer, the primary coil of this kickback transformer is connected with above-mentioned direct supply, thinks described capacitor supply of electrical energy by secondary coil; C) switch element, this switch element on is by the exciting current of the primary coil of the described kickback transformer of described direct-current power supply; D) electric current detects the unit, and this electric current detects the current value that the unit detects described exciting current; E) control module, this control module is controlled the action of described switch element, so that make described switch element in the official hour interval, the number of times that the action of following on/off is stipulated repeatedly: make described switch element action, when described electric current detects current value that the unit detects and reaches setting, described switch element is disconnected then.
In adopting apparatus for analyzing luminosity of the present invention, after control module is connected switch element, become moment of certain certain value at the exciting current of the primary coil of supplying with kickback transformer, the switch element that should temporarily stop its supply is disconnected.Because it is closely bound up with the current value of the coil that flows into kickback transformer by the magnetization energy that kickback transformer is put aside, when so exciting current reaches certain setting, after stopping to supply with this electric current ground and controlling, just it doesn't matter that ground becomes necessarily with the voltage of direct supply for the magnetization energy of control module savings in each on/off action.And then, because control module only carries out the on/off action of the switch element of stipulated number repeatedly, thereby make capacitor charging (being exactly that the magnetization energy of kickback transformer savings is transferred in the capacitor), so in the moment that stops to charge, the energy that capacitor keeps also becomes necessarily.
In addition owing to stipulated the number of occurrence and the time interval (required time of an on/off action of on-off element) of the on/off action of on-off element, so the time till the moment that begins to be charged to complete charge become necessarily.And, if from complete charge the time be carved into the time that makes till the ignitor circuit action and become necessarily, from beginning to be charged to also become necessarily the time of ignitor circuit action so, the consumption (loss amount) that for example detects the energy that the circuit etc. of the charging voltage of capacitor causes also becomes necessarily.Like this, make ignitor circuit action, be about to cause that the savings energy of the capacitor of spark discharge just becomes necessarily.
In addition, the number of occurrence of the on/off action of the savings energy of capacitor and switch element is closely bound up during owing to discharge, can be from the structure of this number of occurrence of external setting-up so can adopt.In addition, disconnect, can also adopt the structure of setting that to judge the current value of exciting current from external setting-up in order to make on-off element.
Behind the apparatus for analyzing luminosity that employing the present invention relates to, can not be subjected to the influence of change etc. of the electrostatic capacitance of the variation in voltage of direct supply and capacitor, can make the discharge of carrying out when the spark discharge certain with the energy of capacitor savings.Like this, can all-the-time stable ground and utilize the discharge generation plasma with roughly the same condition ground.And, can improve the precision and the repeatability of luminesceence analysis.
Description of drawings
Fig. 1 will adopt the illuminating part of apparatus for analyzing luminosity of a kind of embodiment of the present invention as the block diagram at center.Fig. 2 is the main sequential chart that adopts in the illuminating part of apparatus for analyzing luminosity of present embodiment.Fig. 3 is with the illuminating part of the apparatus for analyzing luminosity of the prior art block diagram as the center.Fig. 4 is the oscillogram at the main position in the illuminating part of apparatus for analyzing luminosity of prior art.Fig. 5 is the key diagram of the deviation of the charging voltage in the illuminating part of apparatus for analyzing luminosity of prior art.Symbol description
1 ... capacitator charging circuit 11 ... direct supply 12 ... kickback transformer 13 ... on-off element 15 ... exciting current detecting element 16 ... charging control section 2 ... capacitor circuit 21 ... commutation diode 22 ... discharge capacitor 23 ... charging voltage detecting element 3 ... lighter (igniter) circuit 31 ... lighter transformer 32 ... lighter drive division 4 ... luminous seat 41 ... sparking electrode 42 ... metal test portion 5 ... photometric measurer
Embodiment
Below, with reference to accompanying drawing, tell about the embodiment of the apparatus for analyzing luminosity that the present invention relates to.Fig. 1 be will adopt present embodiment the illuminating part of apparatus for analyzing luminosity as the block diagram at center, Fig. 2 is main sequential chart.For the inscape identical with the apparatus for analyzing luminosity of the prior art of in Fig. 3, telling about, give identical symbol, repeat no more.
Adopt the illuminating part of the apparatus for analyzing luminosity of present embodiment, in capacitator charging circuit 1, exciting current detecting element 15 is connected with the primary coil and the on-off element 13 of kickback transformer 12, is imported charging control section 16 by the current value that this exciting current detecting element 15 detects.Voltage value of detecting that charging control section 16 replaces from charging voltage detecting element 23, according to electric current value of detecting from exciting current detecting element 15, the moment of the on/off of determine switch element 13 action.In addition, though also possess charging voltage detecting element 23 in Fig. 1, this for example is to have carried out discharge fully and setting in order to check whether discharge is charged normal with capacitor 22, perhaps prevents to overcharge, perhaps to detect.
Below, in order, tell about the action of above-mentioned illuminating part.After on-off element 13 was recharged control part 16 connections, the exciting current of direct current just flowed into the primary coil of kickback transformers 12 from direct supply 11, and magnetization energy is put aside by kickback transformer 12.At this moment, exciting current as shown in Figure 2, during the connection of on-off element 13 in, roughly rectilinearity ground increases.The current value of this exciting current is detected momently by exciting current detecting element 15, and charging control section 16 judges whether this current value reaches the threshold value i1 that is predetermined.When the current value that detects exciting current reached threshold value i1, charging control section 16 just disconnected driving switch element 13 rapidly.Like this, the supply of exciting current is just interdicted.When on-off element 13 disconnects, in the secondary coil of kickback transformer 12, produce back electromotive force.Like this, the magnetization energy of being put aside by kickback transformer 12 just was supplied to discharge with capacitor 22 just now, and discharge is charged with capacitor 22.
In charging control section 16, preestablish the number of occurrence of on-off element 13 in length during the on/off action (after on-off element 13 connections, arriving the time interval till the next one is connected) and on/off action.Therefore, the length during the action of this on/off of charging control section 16 usefulness, carry out the on/off action of on-off element 13 of this number of occurrence after, stop charging.
Behind the variation in voltage of direct supply 11, the slope of the increase of the exciting current when connecting on-off element 13 will change.For example in Fig. 2, owing to compare with (A), the voltage of direct supply 11 (B) is low, so that the slope of the increase of exciting current becomes is mild.Corresponding therewith, because till this exciting current reached threshold value i1, on-off element 13 was connected always, so the turn-on time of on-off element 13 just not necessarily, when the slope of the increase of exciting current was mild, the turn-on time of on-off element 13 was just elongated.But as previously mentioned and since the action of on/off during length determine (not changing), so when turn-on time was elongated, just correspondingly shortened trip time.
Because the magnetization energy E by kickback transformer 12 is put aside for coil inductance L, exciting current I, becomes E=(1/2) LI
2So exciting current I one regularly, magnetization energy is also certain.Like this, during on-off element 13 each disconnections, the magnetization energy of same amount just moves to discharge capacitor 22 from kickback transformer 12.And, because the number of times of the on/off of on-off element 13 action also determined, so when stopping to charge, the magnetization energy of putting aside with capacitor 22 of discharge also becomes necessarily.
Like this, after discharge finishes with the charging of capacitor 22, under the control of not shown control circuit, in ignitor circuit 3, lighter drive division 32 makes lighter transformer 31 produce high voltages, thereby produces spark discharge between the sparking electrode 41 of luminous seat 4 and test portion 42.Like this, the element that the surface of metal test portion 42 exists is evaporated, and in the plasma that forms between sparking electrode 41 and metal test portion 42, produces luminous that above-mentioned element causes.
Because length and the number of occurrence certain (at least in the analysis of a test portion do not change) thereof of on-off element 13 during the action of on/off, so certain from the required time that begins to be charged to till the complete charge.Charging voltage detecting element 23 is in parallel with capacitor 22 with discharge, and in addition, though do not illustrate, in order to ensure safety, bleeder resistance is also in parallel with capacitor 22 with discharge.Though they make discharge leak with the electric charge that capacitor 22 keeps, the electric energy of consumption savings is a little in other words, as mentioned above, because required time is certain, so this catabiotic amount also becomes necessarily.And then, owing to just discharge from beginning charging, promptly up to making the time till ignitor circuit 3 moves also certain, so the electric energy that is discharged when discharging with capacitor 22 savings is become necessarily.
Like this, when for example periodically carrying out spark discharge repeatedly, can between sparking electrode 41 and test portion 42, carry out spark discharge, and satisfy the luminous condition in the plasma, can suppress the deviation of useless light value, improve analysis precision and repeatability.
In addition, by the above as can be known: after the number of occurrence of the on/off action of alternation switch element 13, the electric energy difference of being discharged when discharge is carried out and putting aside with capacitor 22.Therefore, when for example wishing the change discharging conditions such as difference according to the kind of test portion and discharge atmosphere, can change the number of occurrence of on/off action.
In addition, above-mentioned embodiment is an example of the present invention, undoubtedly, even carry out suitable distortion in the scope of aim of the present invention, append, revise, is also comprised by " claims " of the present invention.
Claims (3)
1. apparatus for analyzing luminosity possesses:
Sparking electrode disposes with predetermined gap between this sparking electrode and the test portion;
Ignitor circuit, this ignitor circuit is connected with described sparking electrode;
Capacitor, the electric energy of this capacitor savings discharge usefulness; With
Capacitator charging circuit, this capacitator charging circuit charges to described capacitor, it is characterized in that: described capacitator charging circuit possesses:
A) direct supply;
B) kickback transformer, the primary coil of this kickback transformer is connected with described direct supply, by secondary coil to described capacitor supply of electrical energy;
C) switch element, this switch element carries out break-make control to the exciting current by the primary coil of the described kickback transformer of described direct-current power supply;
D) electric current detects the unit, and this electric current detects the current value that the unit detects described exciting current; With
E) control module, this control module is controlled the action of described switch element, so that make described switch element in the official hour interval, the number of times that the action of following on/off is stipulated repeatedly: after described switch element is connected, when detecting current value that the unit detects by described electric current and reach setting, described switch element is disconnected.
2. apparatus for analyzing luminosity as claimed in claim 1 is characterized in that: can be from the number of occurrence of the on/off of the described switch element of external setting-up action.
3. apparatus for analyzing luminosity as claimed in claim 1 or 2 is characterized in that: can be used for described setting that the current value of the described exciting current that disconnects described on-off element is judged from external setting-up.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2006/324834 WO2008072318A1 (en) | 2006-12-13 | 2006-12-13 | Emission analyzer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101558291A CN101558291A (en) | 2009-10-14 |
| CN101558291B true CN101558291B (en) | 2011-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800566272A Active CN101558291B (en) | 2006-12-13 | 2006-12-13 | Emission analyzer |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4919104B2 (en) |
| CN (1) | CN101558291B (en) |
| WO (1) | WO2008072318A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799415B (en) * | 2010-03-04 | 2011-05-11 | 北京纳克分析仪器有限公司 | All-digital energy-adjustable spark light source |
| JP5569086B2 (en) * | 2010-03-25 | 2014-08-13 | 株式会社島津製作所 | Optical emission spectrometer |
| JP6079574B2 (en) * | 2013-11-15 | 2017-02-15 | 株式会社島津製作所 | Luminescence analyzer |
| CN104534510A (en) * | 2014-12-19 | 2015-04-22 | 陈廷 | Fuel gas heating device |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5110870B2 (en) * | 1972-11-17 | 1976-04-07 | ||
| JPS60114746A (en) * | 1983-11-25 | 1985-06-21 | Shimadzu Corp | Spark discharge circuit for emission spectrochemical analysis |
| JPH08184564A (en) * | 1994-12-28 | 1996-07-16 | Kawasaki Steel Corp | Emission spectrochemical analytical method |
| JP3728894B2 (en) * | 1997-08-25 | 2005-12-21 | 株式会社島津製作所 | Emission analysis power supply |
| JP2000009645A (en) * | 1998-06-26 | 2000-01-14 | Horiba Ltd | Emission spectroscopic analyzer |
| JP3870582B2 (en) * | 1998-12-02 | 2007-01-17 | 株式会社島津製作所 | Luminescence analyzer |
| US6518733B1 (en) * | 2001-08-03 | 2003-02-11 | Linear Technology Corporation | Circuits and techniques for capacitor charging circuits |
| JP2003052173A (en) * | 2001-08-06 | 2003-02-21 | Canon Inc | Flyback-type voltage step-up circuit of capacitor |
| JP3708529B2 (en) * | 2003-03-18 | 2005-10-19 | Ｓｍｋ株式会社 | Constant voltage output control method and constant voltage output control device for switching power supply circuit |
| JP2004333323A (en) * | 2003-05-08 | 2004-11-25 | Shimadzu Corp | Emission spectrophotometer |
| JP3733966B2 (en) * | 2004-01-08 | 2006-01-11 | Ｊｆｅスチール株式会社 | Emission spectroscopic method |
-
2006
- 2006-12-13 CN CN2006800566272A patent/CN101558291B/en active Active
- 2006-12-13 WO PCT/JP2006/324834 patent/WO2008072318A1/en active Application Filing
- 2006-12-13 JP JP2008549153A patent/JP4919104B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101558291A (en) | 2009-10-14 |
| WO2008072318A1 (en) | 2008-06-19 |
| JP4919104B2 (en) | 2012-04-18 |
| JPWO2008072318A1 (en) | 2010-03-25 |
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