CN101217098B - A light source of UHF electrodeless discharge lamp - Google Patents
A light source of UHF electrodeless discharge lamp Download PDFInfo
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- CN101217098B CN101217098B CN2007103038617A CN200710303861A CN101217098B CN 101217098 B CN101217098 B CN 101217098B CN 2007103038617 A CN2007103038617 A CN 2007103038617A CN 200710303861 A CN200710303861 A CN 200710303861A CN 101217098 B CN101217098 B CN 101217098B
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Abstract
The invention relates to an ultra-high frequency electrodeless discharge light source, which is composed of an electrodeless discharge lamp, an induction coil and a circuit board of an ultra-high frequency generation circuit, the electrodeless discharge lamp is arranged at the center of a hollow insulating frame, the outside of the insulating frame is sheathed with the induction coil, the induction coil is connected with the circuit board of an ultra-high frequency generator, the electrodeless discharge lamp is filled with hydrogen, deuterium and inert gas or the mixing gas in a sealed glass or quartz tube, the ultra-high frequency generator works at 50MHz to 150MHz and utilizes the gas in an ultra-high frequency ionization lamp for light emission. The ultra-high frequency electrodeless discharge lamp light source of the invention has high stability, small self-absorption, great emission intensity and long service life of the light source, the invention can be smoothly started at the low pressure, and can be used as the light source of a gas chromatography photoionization detector, a background light source of an atomic absorption spectrometer, a photoionization source of a mass spectrometer and so on, and the invention can be further used for generating the ozone for light cleaning, light oxidation, water purification and other treatments.
Description
Technical field
The present invention relates to relate to a kind of special light sources, particularly a kind of testing equipment light source of UHF electrodeless discharge lamp
Background technology
The electrodeless discharge lamp English name is " Electrodeless Discharge Lamp ", claim external electrode lamp (ExternalElectrode Lamp) again, owing to do not have filament or electrode to enter in the bulb, do not have faults such as gas leakage or filament inefficacy, thereby the life-span be long especially.These lamps can produce the high strength spectrum of narrow line and no self-priming.
Hf gas discharge is according to the relative size of applying high frequency electric field angular frequency and electronics effective collision frequency υ, can be divided into ω＜＜υ, ω ≌ υ, ω＞＞three kinds of situations of υ.For exciting of electrodeless gaseous discharge lamp this three kinds of situations are arranged also.
At present, commercially availablely comprise that patent electrodeless discharge lamp light supply apparatus is as follows:
1. the electrodeless discharge lamp operating frequency is below the 100KHz, this in low frequency, work and exciter lamp in gas molecule and luminous, be a kind of low pressure cold light modulation, be applicable to miniaturization, as using on the handheld device.This lamp relies on the capacitive coupling activated plasma luminous.ω during Hf gas discharge in the lamp＜＜υ, the motion of electronics under high-frequency electric field drifted about as the instantaneous anode that a army of bees lets it flow to high-frequency electric field; Oppositely drift again when electric field is reverse.This class discharge belongs to the E type discharge that high-frequency electric field directly excites; in the discharge of E type; usually basic conductive current is made of jointly displacement current and conduction current; discharge is excited by high-frequency electric field; conduction current is not closed, and it is more weak to discharge, and since luminous point at the fluorescent tube center; be easy to generate self-absorption, cause luminous intensity lower.
2. be described as the high-frequency pole-free illuminating lamp of green new light sources, operating frequency is 2.5～3.0MHz, 2.65MHz commonly used, and operating voltage is more than 300V.Its fluorescent tube is a vacuum discharge cavity, and its end is provided with amalgam (Gu mercury), fills the buffering discharge gas in the discharge cavity, forms continuous closure discharge loop, and discharge cavity is by the central axis of annular ferrite core.In fact, discharge cavity becomes the secondary of transformer, by to high frequency sinusoidal voltage around the coil alternation on the outer FERRITE CORE of discharge cavity, make the electric energy lotus root close into discharge cavity, electric current by coil produces stable magnetic flux, and then produce induced voltage along discharge cavity again and keep discharge, the ultraviolet ray excited rare-earth trichromatic fluorescent powder that the mercury ion gasification is produced sends visible light.
3. use microwave-excitation, adopt commodity microwave generator frequency 2450MHz, quartz ampoule is placed in the microwave cavity, and microwave electromagnetic field provides excitation energy by waveguide cavity.The temperature of lamp raises when exciting, and produces a large amount of heat, so cavity planted agent blowing air suitably cools off.
The discharge of above-mentioned 2 and 3 classes belongs to the discharge of H type, wherein basic conductive current has the form of closed curve, and it is to be excited by the ring electric field that alternating magnetic field is responded to, and this discharge can be regulated very by force, be similar to arc discharge, this ionized gas can be regarded the secondary loop of transformer short-circuit as.Arc discharge is a kind of self-maintained discharge, and main feature is that to keep voltage very low, and the current density of discharge is very big.When discharging condition is suitable, can produce " kelvin effect ", the discharge of electrodeless discharge lamp be concentrated on the lamp wall carry out, thus the radiation of lamp only through as thin as a wafer one deck atomic vapour, the self-priming of resonant line can reduce greatly.No matter be the life-span of radiation intensity or lamp, all the increase with stimulating frequency increases, but the stimulating frequency increase causes the electrodless discharge light temperature to raise, and the change of temperature will be directed at the fluctuation of emissive porwer, and spectral emissions is just unstable.In general,
1. (100KHz～100MHz) stability is high, and self-priming is very little with radio frequency.
2. with microwave (＞100MHz, 2450MHz commonly used), input power transforms into the efficient height of radiation, and the big Acceptable life of output intensity is long.
So it is high that existing electrodless discharge lamp source can not satisfy stability simultaneously, self-priming is little, and emissive porwer is big, and light source life is long, can the low pressure requirement of startup smoothly.
Summary of the invention
It is high to the invention provides a kind of stability, and self-priming is little, and emissive porwer is big, and light source life is long, can the smooth light source of UHF electrodeless discharge lamp that starts of low pressure.
For achieving the above object, the present invention adopts following design:
Electrodeless discharge lamp is at diameter 5～12mm, is evacuated in the quartz of long 40～60mm or the glass tube (decide on employed spectral regions) also that charged pressure is the hydrogen of 67-200Pa, deuterium gas and inert gas and their gaseous mixture.
Electrodeless discharge lamp places in the middle of the induction coil, and during work, electromagnetic energy is coupled in the lamp by the solenoid that is around in the fluorescent tube outside, because the solenoidal inductor electromagnetic field is an even variation, is full of the plasma luminescence body in the lamp, and luminous intensity is big, and radiation is even.
The stimulating frequency of electrodeless discharge lamp is between radio frequency and microwave, adopt the electromagnetic energy of hyperfrequency to excite, operating frequency is 50MHz～150MHz, and it is high promptly to have taken into account radio-frequency drive stability, the characteristics that self-priming is little have been taken into account the long characteristics of the big Acceptable life of microwave-excitation output intensity again; In addition on the one hand, adopt hyperfrequency to excite, the ignition voltage peak-to-peak value can drop in several hectovolts.
High frequency power generator also is a high-frequency electronic ballast, and it is the topmost part of hf electrodeless discharge lamp, and the circuit form of employing is a single tube LC self-oscillation mode, does not have transformer, only uses a power transistor.
Adopt the startup of light sensor control electrodeless discharge lamp.
High frequency power generator starting resistor and operating voltage adopt two diode D1 and D2 to carry out seamless switching, and these two diodes can also prevent the peak-to-peak value surge voltage interference power supply that the high frequency power electronic generator produces effectively.
Light source of UHF electrodeless discharge lamp of the present invention, stability is high, self-priming is little, emissive porwer is big, light source life is long, can low pressure start smoothly, can be with being gas chromatograph photoionization detector light source, the background light source of atomic absorption spectrophotometer and the photoionization source in the mass spectrometer etc. can also be used for producing ozone and be used for processing such as light cleaning, photooxidation, water purification.
Description of drawings
Fig. 1 is the electrodeless glow discharge spot lamp schematic diagram of hyperfrequency of the present invention;
Fig. 2 is the electrodeless glow discharge spot lamp structural representation of hyperfrequency of the present invention;
Fig. 3 is the schematic diagram of the electrodeless glow discharge spot lamp coupling scheme one of hyperfrequency of the present invention;
Fig. 4 is the schematic diagram of the electrodeless glow discharge spot lamp coupling scheme two of hyperfrequency of the present invention;
Fig. 5 is the schematic diagram of the electrodeless glow discharge spot lamp coupling scheme three of hyperfrequency of the present invention.
Embodiment
For further setting forth the electrodeless glow discharge spot lamp of hyperfrequency of the present invention, do more detailed explanation below in conjunction with embodiment.
Fig. 2 is the structural representation of the electrodeless glow discharge spot lamp of hyperfrequency of the present invention, the hyperfrequency electrodeless light source is made up of electrodeless discharge lamp 4, induction coil 2, insulation framework 1 and circuit board 3, electrodeless discharge lamp 4 places hollow insulation framework 1 center, insulation framework 1 overcoat has induction coil 2, induction coil 2 connecting circuit plates 3,1 of insulation framework is on insulating support 6, be connected with base 8 with fixed screw 7
Electrodeless discharge lamp is by diameter 13mm, and the quartz glass tube of long 40～60mm is evacuated and charged pressure is the inert gas of the mixing of 67-200Pa, and mixed gas composition is made up of 1%～10% krypton gas and 90%～99% helium or neon.
Induction coil is selected diameter 0.8 for use, length 60cm copper wire (outer surface is preferably silver-plated to reduce the kelvin effect on the lead), coil on insulation framework around 7.5 circles, D=17cm, L=16cm as shown in Figure 4, from the residue copper wire guide on the high frequency power electronic generator printed substrate from the coil two ends, induction coil apart from the about 10cm of wiring board about.
UHF Power generation circuit is arranged on the circuit board 3, detect control start-up circuit and power supply circuits.Fig. 1 is the circuit diagram of the electrodeless glow discharge spot lamp of hyperfrequency of the present invention.
UHF Power generation circuit is a single tube LC self-maintained circuit, form by power tube Q1, inductance L 2, capacitor C 3, C4, biasing resistor R1, R2, R3 provide dc point for power tube Q1, shunt capacitance C6 is the shunt capacitance of resistance R 6, isolate inductance L 1 for isolating inductance, prevent HF leakage, LC self-maintained circuit operating frequency is 50MHz～150MHz, and 2 of UHF Power generation circuit and induction coils adopt coupling capacitance C5 coupling.
Power supply circuits comprise starting resistor circuit S2 and operating voltage circuit S1, it all is the floating ground voltage that produces by AC/DC or DC/DC, starting resistor circuit S2 is connected the UHF Power generator by diode D2, D1 respectively with operating voltage circuit S1, one solid-state relay SSR (also can use controllable silicon) connects starting resistor circuit S1 and operating voltage circuit S2 respectively, the seamless switching between control voltage.
Detect the control start-up circuit and comprise light sensor D3 and amplifying circuit U1 and comparison circuit U2, amplifying circuit U1 and comparison circuit U2 serial connection, the output of comparison circuit U2 is connected to the input of the solid-state relay SSR in the power supply circuits.
The light sensor D3 that detects in the control start-up circuit can adopt photodiode, phototriode etc., the photodiode that adopts in the present embodiment.Whether photodiode detects electrodeless discharge lamp and lights, if do not light, amplifier U1 exports closely potential voltage, comparator U2 output high level signal control solid-state relay SSR conducting.Starting resistor circuit S2 exports starting resistor, D2 powers to high frequency power generator by diode, high frequency power generator produces self-oscillation, produces the electromagnetic wave about 100M Hz in the induction coil, the electric current about starting resistor circuit S2 output this moment 600mA.Energy of electromagnetic field is coupled in the electrodeless discharge lamp, gas avalanche ionization in the lamp forms luminescence of plasma, photodiode induction light signal forms photoelectric current, amplifier U1 output voltage is higher than the reference voltage of U2 comparator end of oppisite phase input, comparator U2 output low level signal, solid-state relay SSR ends, starting resistor circuit S2 turn-offs, operating voltage circuit S1 output services voltage, give the power supply of high frequency power electronic generator by diode D1, keep the electrodeless discharge lamp lighting state ever since, the operating current of operating voltage circuit S1 output is about 300mA.
Can adopt multiple mode to be coupled between ultra-high frequency generator and the induction coil:
Fig. 3 has shown a kind of circuit diagram of coupled modes.Coupling capacitance C5 is connected between the base stage of end L of induction coil and power tube Q1, and the other end H of induction coil is connected on the positive supply of power tube Q1.Because the difference on electric component parameter difference and the assembly technology can be slightly tuning by tunable capacitor C3, reach the strongest resonance condition of circuit output.
Fig. 4 has shown the circuit diagram of second kind of coupled modes.Resonant capacitance C5 is connected between the positive supply of end H of induction coil and UHF Power electronic generator, and the other end L of induction coil is connected on the base stage of power tube Q1, and operation principle is identical with first embodiment.
Fig. 5 has shown the circuit diagram of the third coupled modes.Removed resonant capacitance C5, an end L of induction coil connects the base stage of power tube Q1, and other end H is unsettled.Be to adopt distributed capacitance to replace coupling capacitance C5, key is the lamp integrated mounting means of UHF Power generator printed substrate and induction coil and electrodless discharge: the printed substrate lead of the positive supply of UHF Power generator is in the inside edge of loop line plate, induction coil penetrates from annular printed substrate centre bore, positive source and induction coil form distributed capacitance, substitute resonant capacitance C5.
Like this, the electrodeless discharge lamp of high frequency power electronic generator printed substrate and induction coil and induction coil the inside can be concentrated and be assembled together, as shown in Figure 1.
And in preceding two kinds of coupling schemes, the high frequency power generator printed substrate then can separate a segment distance with the electrodeless discharge lamp of induction coil and induction coil the inside.Look practical situations, can select the different embodiment schemes of apparatus of the present invention for use.
The 3rd embodiment of the present invention is applied in gas chromatograph photoionization detector light source, and its instrument performance is preeminent to be exactly the best proof of apparatus of the present invention superiority.
Though the present invention makes an explanation with reference to certain preferred embodiment, those skilled in the art can make various changes and modification, does not break away from connotation of the present invention and scope.
Claims (8)
1. UHF electrodeless discharge light source, it is characterized in that: described hyperfrequency electrodeless light source is by electrodeless discharge lamp (4), induction coil (2) and circuit board (3) are formed, electrodeless discharge lamp (4) is at diameter 5～12mm, charged pressure is the hydrogen of 67-200Pa in the sealing quartz of long 40～60mm or the glass tube, deuterium gas and inert gas or their gaseous mixture, UHF Power generation circuit is arranged for being enclosed within induction coil (2) power supply outside the electrodeless discharge lamp (4) on the described circuit board (3), provide very-high frequency electromagnetic energy to excite electrodeless discharge tube (4), UHF Power generation circuit is by power tube (Q1), inductance (L2), electric capacity (C3, C4) form, the base stage and the emitter of power tube (Q1) are respectively equipped with biasing resistor (R1, R2, R3), shunt capacitance (C6) and isolation inductance (L1), LC self-maintained circuit operating frequency is 50MHz～150MHz.
2. UHF electrodeless discharge light source according to claim 1 is characterized in that: described discharge lamp (4) places hollow insulation framework (1) center, and insulation framework (1) overcoat has induction coil (2), and induction coil (2) is equidistant helical coil.
3. UHF electrodeless discharge light source according to claim 2 is characterized in that: adopt coupling capacitance (C5) coupling between described UHF Power generation circuit and induction coil (2).
4. UHF electrodeless discharge light source according to claim 3 is characterized in that: power supply circuits are arranged on the described circuit board (3) and detect the control start-up circuit.
5. UHF electrodeless discharge light source according to claim 4, it is characterized in that: described power supply circuits comprise starting resistor circuit (S1) and operating voltage circuit (S2), it all is the floating ground voltage that produces by AC/DC or DC/DC, described starting resistor circuit (S1) is connected described UHF Power generation circuit by diode (D1, D2) respectively with operating voltage circuit (S2), one solid-state relay (SSR) connects described starting resistor circuit (S1) and operating voltage circuit (S2) respectively, the seamless switching between control voltage.
6. UHF electrodeless discharge light source according to claim 5, it is characterized in that: described detection control start-up circuit comprises light sensor (D3), amplifying circuit (U1) and comparison circuit (U2), amplifying circuit (U1) and comparison circuit (U2) serial connection, the output of described comparison circuit (U2) is connected to the input of the solid-state relay (SSR) in the described power supply circuits.
7. UHF electrodeless discharge light source according to claim 6 is characterized in that: described coupling capacitance (C5) adopts feedthrough capacitor, is connected between the collector electrode or base stage of induction coil and power tube (Q1).
8. UHF electrodeless discharge light source according to claim 6 is characterized in that: described coupling capacitance (C5) adopts the distributed capacitance of induction coil and positive supply to substitute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007103038617A CN101217098B (en) | 2007-12-26 | 2007-12-26 | A light source of UHF electrodeless discharge lamp |
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| CN2007103038617A CN101217098B (en) | 2007-12-26 | 2007-12-26 | A light source of UHF electrodeless discharge lamp |
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| CN101217098A CN101217098A (en) | 2008-07-09 |
| CN101217098B true CN101217098B (en) | 2010-12-15 |
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| CN103635000B (en) * | 2012-08-20 | 2018-08-07 | 深圳市海洋王照明工程有限公司 | Lamp protective circuit |
| CN103458592B (en) * | 2012-11-13 | 2015-10-28 | 武汉和光照明科技有限公司 | A kind of magnetic field is triggered the method for fluorescent lamp and is used the fluorescent lamp of the method |
| CN105140098A (en) * | 2015-07-30 | 2015-12-09 | 安徽中杰信息科技有限公司 | Electrodeless vacuum ultraviolet lamp |
| CN110797749B (en) * | 2019-11-07 | 2021-10-08 | 深圳市神飞电子科技有限公司 | High-voltage excitation circuit of laser tube |
| CN111683426B (en) * | 2020-06-24 | 2022-04-12 | 中国电子科技集团公司第四十一研究所 | Radio frequency excitation signal power modulation circuit, method and device |
| CN111665334A (en) * | 2020-07-27 | 2020-09-15 | 江苏华谱联测检测技术服务有限公司 | Air quality detection device |
| CN113363132A (en) * | 2021-05-14 | 2021-09-07 | 中国科学院上海光学精密机械研究所 | Electrodeless millimeter diameter xenon lamp and drive source |
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