CN101799415B - All-digital energy-adjustable spark light source - Google Patents
All-digital energy-adjustable spark light source Download PDFInfo
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- CN101799415B CN101799415B CN2010101181504A CN201010118150A CN101799415B CN 101799415 B CN101799415 B CN 101799415B CN 2010101181504 A CN2010101181504 A CN 2010101181504A CN 201010118150 A CN201010118150 A CN 201010118150A CN 101799415 B CN101799415 B CN 101799415B
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Abstract
The invention relates to an all-digital energy-adjustable spark light source, and belongs to the technical field of spectrum analysis. The spark light source comprises an excitation control system, a spark energy-adjustable power supply circuit, a high-voltage ignition circuit, an argon control circuit, a control system and a USB interface control circuit. A computer transmits to an interface circuit through a USB interface by using control software; the interface circuit is connected with an excitation control circuit; and the excitation control system transmits control pulses to control the magnitude of the voltage of the spark power supply circuit so as to control the magnitude of the energy of spark discharge. In the excitation, an analytical gap is ionized by the high-voltage ignition circuit at first, and then the spark power supply circuit performs the spark discharge; in the excitation, the excitation control system controls the switching on and the switching off of argon simultaneously; and signals sampled in the excitation are transmitted to the computer through the USB interface. The all-digital energy-adjustable spark light source has the advantages that: the excitation discharge frequency and the spark discharge energy can be set continuously on the software to facilitate analyzing chemical compositions of materials with different properties; and excitation control signals are transmitted through optical fibers, so the anti-interference capacity is strong.
Description
Technical field
The invention belongs to field of spectral analysis technology, provide a kind of all-digital energy adjustable spark light source.Be used for direct-reading spark spectrum analysis instrument.
Background technology
Excitation source is very important core component in the spark spectrum analysis instrument.Its effect is to provide evaporation, atomizing excitation energy to analytical sample.When spectral analysis, the evaporation of sample, atomization and excite between do not have obvious boundary, these processes are almost carried out simultaneously, and these a series of processes all directly influence the emission of spectral line and the intensity of spectral line.The excitation source of different-energy has different evaporation behaviors to all kinds of samples, various element.The error main source of spark spectrum analysis is a light source.Therefore the level of excitation source has directly determined the complete machine level of spark spectrum instrument.
The spark excitation light source that present homemade spark spectrum instrument is equipped with, excitation energy can't be adjusted flexibly according to the difference of material, causes stability and the poor accuracy analyzed.
Summary of the invention
The spark light source that provides a kind of all-digital energy adjustable is provided the object of the invention, is to develop the adjustable spark light source of full digital energy that can adapt to various different materials, has obtained good sensitivity, stability and reappearance.
The present invention includes and excite control system, power circuit, high pressure shot-firing circuit, argon gas control circuit and control system and usb control circuit that spark energy is adjustable; Computing machine passes through Control Software, be transferred to interface circuit through USB interface, interface circuit links to each other with excitation control circuit, send gating pulse by exciting control system, the voltage height of control spark power circuit, thereby the energy size of control spark discharge, elder generation with analytical gap ionization, carries out spark discharge by the spark power circuit by the high pressure shot-firing circuit again when exciting; Because ionization easily under argon atmosphere excites control system to control the break-make of argon gas simultaneously when therefore exciting; The signal of gathering when exciting is transferred to computing machine by USB interface.It is characterized in that: computing machine sends control signal, with the percentage of stimulating frequency and spark energy as shooting parameter; The spark light source power circuit adopts the IGBT inverter circuit: direct supply is adopted in input, by IGBT power tube and high-frequency transformer, carries out DC-AC inversion conversion, and then gives the charging of spark discharge electric capacity behind overcommutation; The frequency that discharges and recharges and the height of charging voltage be by control shooting parameter decision, the height continuous controllable of charging voltage, and then make the energy continuous controllable of spark discharge; The output of high pressure shot-firing circuit and spark discharge circuit is received between exciting electrode and the sample to be analyzed, both adopt high pressure resistant fast recovery diode group (its reverse recovery time＜65ns) isolate; Control signal and acquired signal are all transmitted by USB interface and computing machine, connect very convenient; Adopt optical fiber to be connected between excitation control circuit and power circuit, pulse signal transmits by light signal, has isolated control circuit and power circuit, has effectively prevented electromagnetic interference (EMI).
The stimulating frequency of traditional spark light source is divided into several grades, selects one during practical application as required, and stimulating frequency of the present invention can realize continuous adjustment, and setting range is 1Hz～1500Hz, and stimulating frequency is set by computer control software as parameter.The excitation energy of traditional spark light source is divided into several grades, select as required during practical application, spark excitation energy of the present invention is adjustable continuously from 8mJ～800mJ, excitation energy continuous adjustable is (from the continuous adjustable realization of 4V～400V) by spark discharge voltage, as the parameter of control light source activation, set by computer control software.Realize that the continuous adjustable of spark discharge voltage is to realize by the dutycycle of adjusting gating pulse.
The spark light source power circuit adopts the IGBT inverter circuit: direct supply is adopted in input, by IGBT power tube and high-frequency transformer, carries out DC-AC inversion conversion, and then gives the charging of spark discharge electric capacity behind overcommutation.
The output of high pressure shot-firing circuit and spark discharge circuit is received between exciting electrode and the sample to be analyzed, both adopt high pressure resistant fast recovery diode group (its reverse recovery time＜65ns) isolate.
Control signal and acquired signal are all transmitted by USB interface and computing machine, connect very convenient; Adopt optical fiber to be connected between excitation control circuit and power circuit, pulse signal transmits by light signal, has isolated control circuit and power circuit, has effectively prevented electromagnetic interference (EMI).
The stimulating frequency of the spark light source that all-digital energy of the present invention is adjustable and spark excitation energy are adjustable continuously, stimulating frequency is that 1Hz～1500Hz is adjustable continuously, (from 8mJ～800mJ) continuous adjustable is (from the continuous adjustable realization of 4V～400V) by spark discharge voltage to the spark excitation energy, as the parameter of control light source activation, set by computer control software.
The input signal of lighter comes from and obtains after the inverter rectification in the described high pressure shot-firing circuit, the once just once spark discharge of whenever igniting, and the control signal of the control signal of the frequency that high pressure ignites and spark power supply is synchronous.
The present invention compared with prior art has following advantage:
1, the discharge frequency of light source is adjustable continuously, from 1Hz to 1500Hz: the light source discharge frequency directly influences the size of shot point, and the energy density on the unit area, find the stimulating frequency that is suitable for certain material, help fully exciting and shortening the required time of pre-burning of element.Improve analysis precision and speed, result's good reproducibility like this.
2, the excitation energy of light source is adjustable continuously: by the continuous adjusting of voltage from 4V to 400V, thereby realize energy adjustable continuously from 8mJ～800mJ.With this kind light source following advantage is arranged: with this kind light source following advantage is arranged: (1) light source selects for use high-energy, the big higher analytical sample that makes of current impulse, pre-burning energy of generation to be evaporated with gaseous state between preignition period, and makes gaseous atom and then excite this process time to shorten.(2) can overcome the basic effect that some sample causes because of the difference (being heterogeneity) of metallurgy tissue.Employing high energy pre-burning can make heterogeneity sample (as casting pig) carry out abundant fusion on the regional area surface and homogenize, and improves sample analysis result's accuracy.(3) adopt little energy work between integration period, obtain the low current pulse, help reducing background, and do not influence excited state, line strength of acquisition is stable, helps improving the precision and the accuracy of measurement.
Description of drawings
Accompanying drawing 1 is the system schematic of spark light source of the present invention.
Accompanying drawing 2 is the major loop synoptic diagram of inverter spark discharge of the present invention.
Wherein, Ed: input power supply; C1: spark charge and discharge capacitance; T: high-frequency step-up transformer; L: inductance; A: analytical gap; VL: fly-wheel diode.
Embodiment
The present invention includes and excite control system, power circuit, high pressure shot-firing circuit, argon gas control circuit and control system and usb control circuit that spark energy is adjustable; Computing machine passes through Control Software, be transferred to interface circuit through USB interface, interface circuit links to each other with excitation control circuit, send gating pulse by exciting control system, the voltage height of control spark power circuit, thereby the energy size of control spark discharge, elder generation with analytical gap ionization, carries out spark discharge by the spark power circuit by the high pressure shot-firing circuit again when exciting; Because ionization easily under argon atmosphere excites control system to control the break-make of argon gas simultaneously when therefore exciting; The signal of gathering when exciting is transferred to computing machine by USB interface.It is characterized in that: computing machine sends control signal, with the percentage of stimulating frequency and spark energy as shooting parameter; The spark light source power circuit adopts the IGBT inversion transformation technique: direct supply is adopted in input, by IGBT power tube and high-frequency transformer, carries out DC-AC inversion conversion, and then gives the charging of spark discharge electric capacity behind overcommutation; The frequency that discharges and recharges and the height of charging voltage be by control shooting parameter decision, the height continuous controllable of charging voltage, and then make the energy continuous controllable of spark discharge; The output of high pressure shot-firing circuit and spark discharge circuit is received between exciting electrode and the sample to be analyzed, both adopt high pressure resistant fast recovery diode group (its reverse recovery time＜65ns) isolate; Control signal and acquired signal are all transmitted by USB interface and computing machine, connect very convenient; Adopt optical fiber to be connected between excitation control circuit and power circuit, pulse signal transmits by light signal, has isolated control circuit and power circuit, has effectively prevented electromagnetic interference (EMI).
By the system schematic of spark light source shown in Figure 1 as can be known, computer control software sends control signal, control signal comprises the signal of controlling the argon gas gas filling valve, the signal of controlling light source activation frequency, excitation source energy percentage, the control signal that produces is received the control circuit of light source through USB interface; Be input to the excitation control circuit of light source,, produce the adjustable pulse signal of pulsewidth with corresponding frequency of control signal and dutycycle through counter; Pulse signal is through transistor drive circuit, control signal as control HF switch pipe IGBT, the break-make of control IGBT makes direct current 36V power inverter for exchanging, and boosts through step-up transformer, carry out rectification again, charge to electric capacity through inductance after the rectification, the magnitude of voltage that charges on the electric capacity is directly proportional with the dutycycle of control signal, and is corresponding with the energy percentage of computer control signal, the size of voltage on the electric capacity has also just determined the size of the energy of single spark discharge.By the high pressure shot-firing circuit that monostable circuit and ignition coil are formed, produce high pressure and make ionization under argon atmosphere between electrode and the sample, keep spark discharge by the spark power supply then.
By the major loop synoptic diagram of Fig. 2 inverter spark discharge as can be known: direct current 36V power supply is adopted in input, by power tube IGBT1, IGBT2 and high-frequency transformer T, carries out DC-AC inversion conversion, and then through giving the spark discharge capacitor C 1 charging after the rectifier bridge rectification; The frequency that discharges and recharges and the height of charging voltage be by control shooting parameter decision, the height continuous controllable of the charging voltage by capacitor C 1, and then make the energy continuous controllable of spark discharge; Analytical gap A is received in the output of high pressure shot-firing circuit and spark discharge circuit.
Claims (4)
1. spark light source that all-digital energy is adjustable comprises exciting control system, power circuit, high pressure shot-firing circuit, argon gas control circuit and control system and usb control circuit that spark energy is adjustable; It is characterized in that: computing machine passes through Control Software, be transferred to interface circuit through USB interface, interface circuit links to each other with excitation control circuit, send gating pulse by exciting control system, the voltage height of control spark power circuit, thereby the energy size of control spark discharge, elder generation with analytical gap ionization, carries out spark discharge by the spark power circuit by the high pressure shot-firing circuit again when exciting; Excite control system to control the break-make of argon gas simultaneously when exciting; The signal of gathering when exciting is transferred to computing machine by USB interface; Computing machine sends control signal, with the percentage of stimulating frequency and spark energy as shooting parameter; The spark power circuit adopts the IGBT inverter circuit: direct supply is adopted in input, by IGBT power tube and high-frequency transformer, carries out DC-AC inversion conversion, and then gives the charging of spark discharge electric capacity behind overcommutation; The frequency that discharges and recharges and the height of charging voltage be by control shooting parameter decision, the height continuous controllable of charging voltage, and then make the energy continuous controllable of spark discharge; The output of high pressure shot-firing circuit and spark discharge circuit is received between exciting electrode and the sample to be analyzed, and both adopt high pressure resistant fast recovery diode group to isolate; Control signal and acquired signal are all transmitted by USB interface and computing machine; Adopt optical fiber to be connected between excitation control circuit and power circuit, pulse signal transmits by light signal, has isolated control circuit and power circuit.
2. spark light source according to claim 1 is characterized in that, stimulating frequency realizes adjusting continuously, and setting range is 1Hz～1500Hz, as the parameter of control light source activation.
3. spark light source according to claim 1, it is characterized in that the spark excitation energy is adjustable continuously, the spark excitation energy is adjustable continuously from 8mJ～800mJ, excitation energy continuous adjustable is from the continuous realization of 4V～400V, as the parameter of control light source activation by spark discharge voltage.
4. spark light source according to claim 1 is characterized in that, realizes that the continuous adjustable of spark discharge voltage is to realize by the dutycycle of adjusting gating pulse.
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| CN2010101181504A CN101799415B (en) | 2010-03-04 | 2010-03-04 | All-digital energy-adjustable spark light source |
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| CN2010101181504A CN101799415B (en) | 2010-03-04 | 2010-03-04 | All-digital energy-adjustable spark light source |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103025036A (en) * | 2012-12-05 | 2013-04-03 | 钢研纳克检测技术有限公司 | Full-digital pulse combined light source |
| CN103115678B (en) * | 2013-01-30 | 2015-01-21 | 中国广州分析测试中心 | Bidirectionally excited spark light source with high repetition frequency |
| CN104280380A (en) * | 2014-10-24 | 2015-01-14 | 合肥卓越分析仪器有限责任公司 | Spark excitation light source of photoelectric direct-reading spectrograph |
| CN106872444B (en) * | 2017-03-07 | 2024-03-29 | 昆山书豪仪器科技有限公司 | Numerical control spark power supply |
| CN110308549B (en) * | 2019-08-05 | 2024-01-19 | 常丽 | Whole slide multi-light-path high-flux pathological section scanner |
| CN111185854A (en) * | 2020-01-20 | 2020-05-22 | 武汉科技大学 | Spark spectrum analysis surface water jet cutting method |
| CN116779413B (en) * | 2023-06-10 | 2024-01-12 | 广东中科谛听科技有限公司 | Digital spark source system |
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| US6034483A (en) * | 1995-07-14 | 2000-03-07 | Unison Industries, Inc. | Method for generating and controlling spark plume characteristics |
| CN1370987A (en) * | 2002-04-01 | 2002-09-25 | 钢铁研究总院 | In-situ metal analyzer |
| CN101558291A (en) * | 2006-12-13 | 2009-10-14 | 株式会社岛津制作所 | Emission analyzer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7322197B2 (en) * | 2004-12-23 | 2008-01-29 | Pratt + Whitney Canada Corp. | Variable rate ignition |
| US7643267B2 (en) * | 2007-03-15 | 2010-01-05 | Shimadzu Corporation | Optical emission spectrometry device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6034483A (en) * | 1995-07-14 | 2000-03-07 | Unison Industries, Inc. | Method for generating and controlling spark plume characteristics |
| CN1370987A (en) * | 2002-04-01 | 2002-09-25 | 钢铁研究总院 | In-situ metal analyzer |
| CN101558291A (en) * | 2006-12-13 | 2009-10-14 | 株式会社岛津制作所 | Emission analyzer |
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Address after: 100081 Beijing sorghum Bridge ramp street, No. 13, No. Patentee after: NCS TESTING TECHNOLOGY CO.,LTD. Address before: 100081 Beijing sorghum Bridge ramp street, No. 13, No. Patentee before: NCS Testing Technology Co.,Ltd. Address after: 100081 Beijing sorghum Bridge ramp street, No. 13, No. Patentee after: NCS Testing Technology Co.,Ltd. Address before: 100081 Beijing sorghum Bridge ramp street, No. 13, No. Patentee before: BEIJING NCS ANALYTICAL INSTRUMENTS Co.,Ltd. |
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Effective date of registration: 20221010 Address after: Room 8, No. 528, Nanbang Road, Kunshan Development Zone, Suzhou, Jiangsu 215300 Patentee after: Steel Research Nanoco Jiangsu Testing Technology Research Institute Co.,Ltd. Address before: 100081, Beijing Haidian District sorghum Bridge oblique Street No. 13 Patentee before: NCS TESTING TECHNOLOGY CO.,LTD. |