CN204789344U - Direct -reading spectrometer excitation light source circuit - Google Patents
Direct -reading spectrometer excitation light source circuit Download PDFInfo
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- CN204789344U CN204789344U CN201520514494.5U CN201520514494U CN204789344U CN 204789344 U CN204789344 U CN 204789344U CN 201520514494 U CN201520514494 U CN 201520514494U CN 204789344 U CN204789344 U CN 204789344U
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- mos pipe
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Abstract
The utility model relates to a direct -reading spectrometer excitation light source circuit, including DC power supply, provide direct current for the excitation light source circuit, the power inductance, separation alternating current has only direct current in the messenger excitation light source circuit, step motor, control exciting electrode reciprocate, exciting electrode, point discharge produces electric arc, and treats to form stable arc discharge between the analysis sample, makes the atom of treating in the analysis sample luminous, the formation and the disconnection in the return circuit of discharging are controlled to power MOS pipe, power MOS manages drive circuit, switching on and ending through the control impuls control power MOS pipe. The utility model discloses need not the high pressure and ignite, do not have and disturb and the potential safety hazard, the combination that need not inductance, electric capacity forms discharge current, and ability effective control discharge current's intensity and discharge time, owing to cancelled bulky electric capacity, the excitation light source volume diminishes, reduced simultaneously between the different excitation light source that lead to because of the discreteness of electric capacity the energy difference do not.
Description
Technical field
The utility model relates to a kind of excitation source circuit, especially a kind of excitation source for direct-reading spectrometer.
Background technology
Direct-reading spectrometer is a kind of optical instrument of precision, its optical texture is placed in the light chamber interior of sealing, the light signal that sample to be analyzed produces in the use procedure of instrument enters light room, projected on line array sensor by optical texture and be converted to electric signal, then being converted to digital signal by electronic module is stored in single-chip microcomputer, the analysis software run on computers reads digital signal from single-chip microcomputer, carries out analysis and calculation, obtains the content of each chemical element in sample.
It is fast that direct-reading spectrometer has analysis speed, and accuracy advantages of higher, therefore, is all widely used in industries such as metal smelt, machining, castings, is a kind of strong means of metal material wood properly test, has good market value basis.
In direct-reading spectrometer, excitation source is core, and it plays the atom in sample to be analyzed to heat instantaneously and forms the effect of atomic emission spectrum, and its stability and reliability determine the overall performance of direct-reading spectrometer.
The excitation source of present direct-reading spectrometer on the market, the main shortcoming existed:
1, the main loop of power circuit of excitation source adopts inductance, capacitor combination mostly, form different L, C ratios, thus form the discharge current of needs in sample discharge process to be analyzed, inductance, electric capacity are bulky, affect the miniaturization of equipment, and the discreteness of inductance, electric capacity makes the energy difference between different excitation source very large;
2, in order to form effective discharge loop between sample to be analyzed and exciting electrode, needing the high pressure of outfit about 10,000 volts to carry out shot-firing circuit, very strong interference and potential safety hazard can be brought like this, the reliability of equipment is had an impact.
Utility model content
The technical problems to be solved in the utility model overcomes existing technological deficiency, and provide a kind of direct-reading spectrometer excitation source circuit, it is without the need to high voltage ignition, does not therefore have interference and potential safety hazard; What it did not need inductance, electric capacity is combined to form discharge current, and can the effectively intensity of controlled discharge electric current and discharge time; Owing to eliminating bulky electric capacity, whole excitation source smaller volume, decreases because the discreteness of electric capacity and energy difference between the different excitation sources that cause simultaneously.
In order to solve the problems of the technologies described above, the utility model provides following technical scheme:
A kind of direct-reading spectrometer excitation source circuit, comprise direct supply, power inductance, stepper motor, exciting electrode, power MOS pipe and power MOS pipe driving circuit, direct supply provides DC current to excitation source circuit, power inductance intercepts alternating current, make to only have DC current in excitation source circuit, step motor control exciting electrode moves up and down, the point discharge of exciting electrode produces electric arc, and form stable arc discharge between sample to be analyzed, make the atom in sample to be analyzed luminous, the formation in power MOS pipe controlled discharge loop and disconnection, power MOS pipe driving circuit controls conducting and the cut-off of power MOS pipe by gating pulse, direct supply connects power inductance, exciting electrode, sample to be analyzed and power MOS pipe successively and forms a closed-loop path, and stepper motor connects exciting electrode, and power MOS pipe driving circuit connects power MOS pipe.
Further, power MOS pipe is N channel enhancement MOSFET, and the grid of power MOS pipe is connected with power MOS pipe driving circuit, and the drain electrode of power MOS pipe is connected with sample to be analyzed, the source electrode of power MOS pipe is connected with the negative pole of direct supply, and the positive pole of direct supply is connected with power inductance.
Further, the distance between exciting electrode and sample to be analyzed, when 3mm, forms stable arc discharge.
The beneficial effects of the utility model:
1, the utility model without the need to inductance, electric capacity be combined to form discharge current, and can the intensity of effectively controlled discharge time and discharge current by the ON time of power MOS pipe and conducting resistance; Owing to eliminating bulky electric capacity, whole excitation source smaller volume, decreases because the discreteness of electric capacity and energy difference between the different excitation sources that cause simultaneously.
2, the utility model is without the need to puncturing the clearance of exciting electrode and sample room to be analyzed up to the ignitor supply of 10,000 volts, so there is no strong jamming and safety problem, and the reliability of equipment is high.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for instructions, is used from explanation the utility model, does not form restriction of the present utility model with embodiment one of the present utility model.In the accompanying drawings:
Fig. 1 is the theory diagram of a kind of direct-reading spectrometer excitation source of the utility model circuit;
Fig. 2 is the exciting electrode of preferred embodiments and the schematic diagram of sample contacts to be analyzed of a kind of direct-reading spectrometer of the utility model excitation source circuit;
Fig. 3 is the schematic diagram that the exciting electrode of the preferred embodiments of a kind of direct-reading spectrometer of the utility model excitation source circuit slowly leaves sample to be analyzed.
Description of reference numerals: 1-direct supply, 2-power inductance, 3-stepper motor, 4-exciting electrode, 5-sample to be analyzed, 6-power MOS pipe, 7-power MOS pipe driving circuit.
Embodiment
Embodiment cited by the utility model; just understand the utility model for helping; should not be construed as the restriction to the utility model protection domain; for those skilled in the art; under the prerequisite not departing from the utility model thought; can also improve the utility model and modify, these improve and modification also falls in the scope of the utility model claim protection.
As shown in Figure 1, a kind of direct-reading spectrometer excitation source of the utility model circuit, for formation atomic emission spectrum that the atom in sample 5 to be analyzed is heated instantaneously, excitation source circuit comprises direct supply 1, power inductance 2, stepper motor 3, exciting electrode 4, power MOS pipe 6 and power MOS pipe driving circuit 7, direct supply 1 provides DC current to excitation source circuit, power inductance 2 intercepts alternating current, make to only have DC current in excitation source circuit, stepper motor 3 controls exciting electrode 4 and moves up and down, the point discharge of exciting electrode 4 produces electric arc, and sample 5 to be analyzed is apart from forming stable arc discharge between 3mm, make the atom in sample 5 to be analyzed luminous, power MOS pipe 6 is N channel enhancement MOSFET, the formation in controlled discharge loop and disconnection, power MOS pipe driving circuit 7 controls conducting and the cut-off of power MOS pipe 6 by gating pulse, the positive pole of direct supply 1 connects the drain electrode of power inductance 2, exciting electrode 4, sample to be analyzed 5 and power MOS pipe 6 successively, the source electrode of power MOS pipe 6 is connected with the negative pole of direct supply 1, form a closed-loop path, stepper motor 3 connects exciting electrode 4, and power MOS pipe driving circuit 7 connects power MOS pipe 6.
The course of work of the present utility model is as follows:
When 1, starting working, provide DC current by direct supply 1 and power inductance 2 to circuit, exciting electrode 4, under the drive of stepper motor 3, moves down, and contacts, as shown in Figure 2 with sample 5 to be analyzed.
2, power MOS pipe driving circuit 7 sends gating pulse, make power MOS pipe 6 conducting, at this moment direct supply 1, power inductance 2, exciting electrode 4, sample to be analyzed 5 form a closed discharge loop together with power MOS pipe 6, the strength of current increasing this loop stream warp along with the time can constantly increase (according to formula U=L (di/dt), when the voltage of direct supply 1 is constant, the strength of current flowing through power inductance 2 to increase along with the time and to increase).
3, under stepper motor 3 controls, exciting electrode 4 slowly leaves sample 5 to be analyzed, and finally rest on distance 3mm place, in table 1, the comparison of each constituent content deviation in the sample analyzed in different distance situation, therefrom can find out that 3mm is optimal distance, due to the existence of arcing effect, form stable arc discharge by between exciting electrode 4 and sample to be analyzed 5, thus the atom realized in sample 5 to be analyzed is luminous, completes and excites work.
RSD (%) under table 1 Different electrodes spacer conditions compares
4, after exciting the stipulated time to terminate, power MOS pipe control circuit 7 stops the drive singal of transmitted power metal-oxide-semiconductor 6, i.e. gating pulse, power MOS pipe 6 ends, disconnect by the closed discharge loop formed together with the electrical discharge arc between direct supply 1, power inductance 2, exciting electrode 4, sample to be analyzed 5, power MOS pipe 6 and exciting electrode 4 with sample 5 to be analyzed, electrical discharge arc between exciting electrode 4 and sample to be analyzed 5 stops, and completes once complete to excite discharge process.
5, repeat the course of work of step 1-4, excitation source realizes repeatedly working.
In the utility model, power MOS pipe 6 is the cut-in voltage V of N channel enhancement MOSFET, N channel enhancement MOSFET
tgenerally be about 2V, therefore the gate source voltage V of N channel enhancement MOSFET
gSonly need to be greater than V
twill conducting, driving circuit provides charging current to make gate source voltage V
gSrise to and be greater than V
tvalue just passable, do not need up to 10,000 volts of keep-alive voltages.When N channel enhancement MOSFET conducting, just produce a conducting resistance R
dS, to the voltage V that N channel enhancement MOSFET applies
gShigher, R
dSless, when the voltage of direct supply 1 is constant, the intensity of discharge current is larger, otherwise less, and therefore, the conducting resistance size of power MOS pipe 6 determines the intensity of discharge current, and the ON time of power MOS pipe 6 determines discharge time.
Claims (3)
1. a direct-reading spectrometer excitation source circuit, it is characterized in that: comprise direct supply (1), power inductance (2), stepper motor (3), exciting electrode (4), power MOS pipe (6) and power MOS pipe driving circuit (7), described direct supply (1) provides DC current to excitation source circuit, described power inductance (2) intercepts alternating current, make to only have DC current in excitation source circuit, described stepper motor (3) controls exciting electrode (4) and moves up and down, the point discharge of described exciting electrode (4) produces electric arc, and sample to be analyzed forms stable arc discharge between (5), make the atom in sample to be analyzed (5) luminous, the formation in described power MOS pipe (6) controlled discharge loop and disconnection, described power MOS pipe driving circuit (7) controls conducting and the cut-off of power MOS pipe (6) by gating pulse, described direct supply (1) connects power inductance (2), exciting electrode (4), sample to be analyzed (5) and power MOS pipe (6) successively and forms a closed-loop path, stepper motor (3) connects exciting electrode (4), and power MOS pipe driving circuit (7) connects power MOS pipe (6).
2. direct-reading spectrometer excitation source circuit according to claim 1, it is characterized in that: described power MOS pipe (6) is N channel enhancement MOSFET, the grid of power MOS pipe (6) is connected with power MOS pipe driving circuit (7), the drain electrode of power MOS pipe (6) is connected with sample to be analyzed (5), the source electrode of power MOS pipe (6) is connected with the negative pole of direct supply (1), and the positive pole of direct supply (1) is connected with power inductance (2).
3. direct-reading spectrometer excitation source circuit according to claim 1, is characterized in that: the distance between described exciting electrode (4) and sample to be analyzed (5), when 3mm, forms stable arc discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520514494.5U CN204789344U (en) | 2015-07-15 | 2015-07-15 | Direct -reading spectrometer excitation light source circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520514494.5U CN204789344U (en) | 2015-07-15 | 2015-07-15 | Direct -reading spectrometer excitation light source circuit |
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| Publication Number | Publication Date |
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| CN204789344U true CN204789344U (en) | 2015-11-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067589A (en) * | 2015-07-15 | 2015-11-18 | 无锡创想分析仪器有限公司 | Excitation light source circuit for direct-reading spectrometer |
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2015
- 2015-07-15 CN CN201520514494.5U patent/CN204789344U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067589A (en) * | 2015-07-15 | 2015-11-18 | 无锡创想分析仪器有限公司 | Excitation light source circuit for direct-reading spectrometer |
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