CN115985756A - Microwave element lamp and application device thereof - Google Patents
Microwave element lamp and application device thereof Download PDFInfo
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- CN115985756A CN115985756A CN202211719724.2A CN202211719724A CN115985756A CN 115985756 A CN115985756 A CN 115985756A CN 202211719724 A CN202211719724 A CN 202211719724A CN 115985756 A CN115985756 A CN 115985756A
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Abstract
The invention discloses a microwave element lamp and an application device thereof, relating to the technical field of light source devices. According to the microwave element lamp and the application device thereof, the inner glass tube attached with the sample, the microwave antenna, the connecting sheet, the connecting electrode, the solid microwave source and the signal adapter are adopted, so that the sample attached to the inner glass tube can be excited under the microwave excitation condition to generate a metal element spectral line corresponding to the sample, and the stability and the signal-to-noise ratio can be improved under the condition that the same emission intensity as that of the existing element lamp is ensured. In addition, the invention adopts the characteristics of high-temperature evaporation and low-temperature adhesion of the sample under the control of microwave, thereby ensuring the use stability and prolonging the service life.
Description
Technical Field
The invention relates to the technical field of light source devices, in particular to a microwave element lamp and an application device thereof.
Background
The existing elemental lamps for atomic spectral analysis are mainly hollow cathode lamps. The cathode of the hollow cathode lamp is an open hollow cylinder structure formed by all or part of metal, and the anode and the cathode are sealed in a glass tube filled with neon gas or argon gas. Applying a potential between the anode and the cathode of the hollow cathode lamp, ionizing part of gas-filled atoms in the lamp, bombarding the cathode with negative charges by ions with positive charges to knock out metal atoms, further colliding the sputtered metal atoms with the gas-filled ions, and exciting to an excited state, thereby generating a spectrum of the metal element of the metal cathode. The cathodes of hollow cathode lamps are usually made of high purity metals, so that a very pure emission spectrum is obtained. The cathode may also be made from a combination of several metals or from an alloy thereof to produce a multi-element hollow cathode lamp containing the full metal spectrum of the cathode. However, the combination of all metals is impossible due to the limitations of metallurgical characteristics and spectrum of the metal elements, so that the market is mostly single-element hollow cathode lamps and also partial-element multi-element lamps. However, the emission spectrum intensity of each element in the multi-element lamp is not as high as that of the single-element lamp, which leads to a deterioration in the signal-to-noise ratio, thereby affecting the analytical precision and detection limit. Therefore, in the case of analyzing elements which are close to the detection limit and which require high accuracy, it is preferable to use a single element lamp. Partial evaporation loss after sputtering of the cathode metal of the hollow cathode lamp will result in a gradual decrease in the spectral intensity of the elemental lamp. The hollow cathode lamp power is generally several watts, and the service life is generally about 5000 milliampere hours.
The existing lamp manufactured by using microwave technology is a microwave sulfur lamp. For example, chinese patents CN1209903A, CN2537121Y, etc. are all inventions related to microwave sulfur lamps. The microwave sulfur lamp comprises a quartz bulb, wherein the bulb contains several milligrams of sulfur powder and argon gas, and the bulb is arranged in a microwave resonant cavity of a metal net. One magnetron emits 2.45GHz microwaves, and the bulbs are bombarded by the microwaves through waveguides. The microwave energy excites the gas in the bulb, so that the sulfur is heated to extremely high temperature to form plasma luminescence. Because the temperature of the microwave sulfur lamp is extremely high during working, enough heat dissipation measures are needed to prevent the bulbs from melting. The microwave sulfur lamp is a high-efficiency full-spectrum electrodeless lamp, utilizes strong light generated by additive substances, and is mainly used in the field of illumination. The microwave lamp manufactured by the microwave technology can be manufactured into microwave metal halide lamps, such as Chinese CN101281853A, microwave selenium lamps CN108648986A and the like, according to different substances added in the bulb, but the microwave metal halide lamps are all used for illumination. The microwave sulfur lamp and the like have the advantages of high luminous intensity, high illumination, good color temperature and long service life, and are very suitable for being used in the field of illumination. However, because the power of the magnetron power supply is large (hundreds to thousands of watts), the intensity of the light source is high, the control principle is limited, the stability of the spectral line is poor, and the microwave sulfur lamp can not be used as the light source of a spectrum instrument along with the fluctuation of the power supply.
In conclusion, the traditional hollow cathode lamp is influenced by electrode metal and has short service life; most of the lamps are single-element hollow cathode lamps, and the multi-element lamps are few, and have poor emission intensity and signal-to-noise ratio; the existing microwave lamp structure generally adopts a magnetron to provide microwave energy, the power of the magnetron is generally more than hundreds to thousands of watts, the power is larger, the light intensity is high, but the microwave energy excitation signal is not modulated and controlled, so the emitted microwave light has high intensity and enough energy, but the stability is poorer.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a microwave element lamp and an application device thereof.
In order to achieve the purpose, the invention provides the following scheme:
a microwave elemental lamp comprising: the device comprises an inner glass tube, an outer glass tube, a microwave antenna, a connecting sheet and a connecting electrode;
the inner glass tube, the connecting sheet and the connecting electrode are all arranged in the outer glass tube; a sample is attached to the inner wall of the inner glass tube; the microwave antenna is wound on the outer wall of the inner glass tube; one end of the microwave antenna is fixed on the outer wall of the inner glass tube, and the other end of the microwave antenna is connected with one end of the connecting sheet; the other end of the connecting sheet is connected with the connecting electrode; when the device is applied, the other end of the connecting electrode is used for connecting external equipment.
Preferably, the inner glass tube is a closed ellipsoid or a closed cylinder.
Preferably, the outer glass tube comprises: a first portion and a second portion;
the first portion is a cylinder; the second part is formed by pressing a cylinder; the second portion forms a unitary structure with the first portion.
Preferably, the inner glass tube is disposed in the first portion of the outer glass tube; the connecting sheet and the connecting electrode are both arranged on the second part of the outer glass tube.
Preferably, the first portion of the outer glass tube is further provided with a technical seal.
Preferably, the longest diameter of the cross-section in the second portion is less than or equal to the diameter of the cross-section in the first portion.
Preferably, the sample is an elemental substance or a compound formed from the elemental substance that meets the evaporation requirements.
The invention also provides a microwave element lamp application device, which comprises: the microwave lamp comprises a solid microwave source, a signal adapter, a shielding resonant cavity and the provided microwave element lamp;
the microwave element lamp is connected with the signal adapter; the signal adapter is connected with the solid microwave source through a coaxial communication cable; the shielding resonant cavity is arranged on the signal adapter, and the microwave element lamp is arranged in the shielding resonant cavity.
Preferably, the shielding resonant cavity is provided with an opening for light source radiation.
Preferably, the power of the solid state microwave source is less than 100W.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the microwave element lamp and the application device thereof, the inner glass tube attached with the sample, the microwave antenna, the connecting sheet, the connecting electrode, the solid microwave source and the signal adapter are adopted, so that the sample attached to the inner glass tube can be excited under the microwave excitation condition to generate a metal element spectral line corresponding to the sample, and the stability and the signal-to-noise ratio can be improved under the condition that the same emission intensity as that of the existing element lamp is ensured. In addition, the invention adopts the characteristics of high-temperature evaporation and low-temperature adhesion of the sample under the control of microwave, thereby ensuring the use stability and prolonging the service life.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a microwave elemental lamp according to the present invention;
FIG. 2 is a schematic structural diagram of an apparatus for applying a microwave elemental lamp according to the present invention;
FIG. 3 is a schematic diagram showing characteristic peaks of a microwave elemental lamp containing Pb according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the stability of a microwave elemental lamp containing Pb according to an embodiment of the present invention;
description of the symbols:
1-microwave element lamp, 10-outer glass tube, 10 a-process seal, 10 b-first part of outer glass tube, 10 c-middle part of outer glass tube, 10 d-second part of outer glass tube, 11-inner glass tube, 12-microwave antenna, 12 a-one end of microwave antenna, 12 b-other end of microwave antenna, 13-connecting sheet, 14-connecting electrode, 15-sample, 2-shielding resonant cavity, 3-signal adapter, 4-coaxial communication cable and 5-solid microwave source.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a microwave element lamp and an application device thereof, wherein the microwave element lamp has the advantages of long service life, strong emission intensity, high signal-to-noise ratio, strong stability and the like.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the microwave elemental lamp 1 according to the present invention includes: an inner glass tube 11, an outer glass tube 10, a microwave antenna 12, a connecting sheet 13 and a connecting electrode 14.
The inner glass tube 11, the connecting sheet 13 and the connecting electrode 14 are disposed in the outer glass tube 10. The inner wall of the inner glass tube 11 is attached with a sample 15, and specifically, saturated steam of the sample 15 is adsorbed and settled on the inner wall of the inner glass tube 11 under certain temperature and pressure conditions. The microwave antenna 12 is wound around the outer wall of the inner glass tube 11. One end 12a of the microwave antenna 12 is fixed to the outer wall of the inner glass tube 11, and the other end 12b of the microwave antenna 12 is connected to one end of the connecting piece 13. The other end of the connection piece 13 is connected to the connection electrode 14. When the device is used, the other end of the connecting electrode 14 is used for connecting an external device.
The inner glass tube 11 used in the present invention may be a closed ellipsoid or a closed cylinder, but is not limited thereto, and may be made into different shapes according to the actual requirements of customers during the actual use process.
The outer glass tube 10 includes: a first portion 10b and a second portion 10d.
The first portion 10b (i.e. the upper end 10b of the outer glass tube 10) is a cylindrical structure, and has a certain space with the microwave antenna 12 and the inner glass tube 11. Based on this, the microwave antenna 12 is spirally wound on the inner glass tube 11 and positioned between the inner glass tube 11 and the outer glass tube 10, and the microwave antenna 12 fixes the inner glass tube 11 in the coil formed by the microwave antenna 12. The second portion 10d is formed by pressing a cylindrical body. The inner glass tube 11 is placed in the first portion 10b of the outer glass tube 10. The connection tab 13 and the connection electrode 14 are both disposed on the second portion 10d of the outer glass tube 10.
For example, in a heated environment, a shaping process is performed at the outer glass tube central portion 10c, and the connecting piece 13, the other end 12b of the microwave antenna 12, and one end of the connecting electrode 14 are pressed together to be flat, so that the outer glass tube 10 is divided into the first portion 10b and the second portion 10d at the outer glass tube central portion 10 c.
In order to simplify the manufacturing process, a process seal 10a is further disposed on the first portion 10b of the outer glass tube 10, so that the process seal 10a is sealed after vacuum pumping.
In practice, the longest diameter of the cross-section in the second portion 10d may be less than or equal to the diameter of the cross-section in the first portion 10b.
The invention also provides a microwave element lamp 1 application device, as shown in fig. 2, the device comprises: a solid microwave source 5, a signal adapter 3, a shielding resonant cavity 2 and the microwave element lamp 1 provided above.
The microwave element lamp 1 is connected with the signal adapter 3. The signal adapter 3 is connected with a solid-state microwave source 5 through a coaxial communication cable 4. The shielding resonant cavity 2 is arranged on the signal adapter 3, and the microwave element lamp 1 is arranged in the shielding resonant cavity 2.
Wherein, the shielding resonant cavity 2 is provided with an opening for light source radiation.
Further, in order to improve the stability of the light source of the application device of the microwave element lamp 1, the solid-state microwave source 5 adopted by the invention has a signal modulation function, and the power of the solid-state microwave source 5 is generally less than 100W, but in the actual use process, the specific parameters and functions of the solid-state microwave source 5 can be reasonably selected according to the actual requirements.
The sample 15 attached to the inner wall of the inner glass tube 11 was referred to as PbI below 2 For example, the specific preparation and operation principle of the microwave elemental lamp 1 and the application device thereof provided above are explained, and in the practical application process, the sample 15 may be other elements.
The inner glass tube 11 has a cylindrical structure, and a sample 15 is contained therein. Heating the sample 15 to several hundred degrees centigrade (for example, within 1000 ℃) in a low vacuum environment with a pressure of about 100Pa and introducing a protective gas, so that the sample 15 is heated and evaporated, filling the inner glass tube 11 with a gas evaporant of the sample 15, sealing two ends of the inner glass tube 11 after the vapor pressure is balanced, and cooling the inner glass tube 11 to a normal temperature, and then attaching a trace amount of the sample 15 to the inner wall thereof.
A spiral wire is wound around the outside of the inner glass and used as a microwave antenna 12 for exciting energy. The lower end of the inner glass tube 11 is in contact with one end 12a of the microwave antenna 12, and the upper end of the inner glass tube 11 is in contact with the other end 12b of the microwave antenna 12, so that the inner glass tube 11 is fixed inside the microwave antenna 12.
The other end 12b of the microwave antenna 12 is welded to one end of the connection piece 13, and the connection electrode 14 is welded to the other end of the connection piece 13.
The outer glass tube 10 has a cylindrical shape as a whole, and the above-described components assembled and welded by the inner glass tube 11, the microwave antenna 12, the connecting sheet 13, and the connecting electrode 14 are placed in the outer glass tube 10. In a heating environment, the middle part 10c of the outer glass tube is shaped, and the connecting sheet 13, the microwave antenna 12 and the connecting electrode 14 are pressed in a flat structure, so that the outer glass tube 10 is divided into two parts (i.e. a first part 10b and a second part 10 d) along the middle part 10c of the outer glass tube. In this embodiment, the second portion 10d of the outer glass tube 10 may still be of cylindrical configuration and provided with an opening at its lower end for connection of the connection electrode 14 with the application device. The first portion 10b of the outer glass tube 10 is also cylindrical so as to completely enclose the inner glass tube 11 and the microwave antenna 12.
The inside of the first portion 10b of the outer glass tube 10 is evacuated and sealed at the process seal 10a to form an arc-shaped structure.
When in use, the microwave element lamp 1 is inserted and installed on the signal adapter 3. The signal adapter 3 is similar to a common radio frequency coaxial connector in the market in structure, a metal core hole is formed in the signal adapter, one end of the signal adapter is provided with an inner-layer cylinder and an outer-layer cylinder, and the other end of the signal adapter is provided with a threaded interface.
The connecting electrode 14 of the microwave element lamp 1 is connected with the metal core hole of the signal adapter 3, and the lower end of the second part 10d of the outer glass tube 10 is matched with the inner cylindrical end of the signal adapter 3, so that the plugging and the replacement are convenient. The shielding resonant cavity 2 is also arranged on the signal adapter 3 and is matched with the outer glass tube 10.
The screw interface end of the signal adapter 3 is connected with a coaxial communication cable 4, and the other end of the coaxial communication cable 4 is connected with a solid microwave source 5.
When in work, microwave modulation signals generated from the solid microwave source 5 are conducted to the microwave antenna 12 through the coaxial cable, the signal adapter 3, the connecting electrode 14 and the connecting sheet 13. Under the coupling action of the microwave modulation signal and the shielding resonant cavity 2, the protective gas in the inner glass tube 11 and the sample 15 are heated and excited to generate a spectral line containing metal elements in the sample 15, and the spectral line is guided into a subsequent light source instrument from the opening of the shielding resonant cavity 2 to be used as a light source of the instrument.
In order to further improve the stability, in this embodiment, the power of the solid-state microwave source 5 is generally below 100W, and the solid-state microwave source has a signal modulation function to meet the requirements of the spectroscopic instrument on the light source and the signal acquisition.
For example, sample 15PbI was purged with argon at 500 ℃ and maintained at 100Pa 2 Placing in an inner glass tube 11, keeping for 5min, sample 15PbI 2 The saturated steam is heated and evaporated to fill the inner glass tube 11, and the two side ports of the inner glass tube 11 are welded and sealed. Then, the microwave antenna 12 is wound, and the microwave antenna 12 is packaged with the connecting sheet 13, the connecting electrode 14, the outer glass tube 10, and the like. Based on this operation, a microwave elemental lamp 1 containing a Pb element was produced. The peak shape and stability of the characteristic spectrum of the microwave elemental lamp 1 containing Pb element were measured on a TAS-990 atomic absorption spectrophotometer to obtain the spectra shown in fig. 3 and 4.
Based on fig. 3 and 4, it can be seen that the negative high voltage at pb283.3nm at which peak seeking obtains maximum energy is 166V, which is much smaller than the negative high voltage of about 300V at peak seeking of the conventional Pb hollow cathode lamp. In addition, under the continuous 15min (900 s) test condition, the dynamic noise of the Pb element-containing microwave element lamp 1 provided by the present embodiment varies within ± 0.005Abs, and completely meets the requirement of the atomic spectrum instrument for the stability of the light source.
Based on the above description, the present invention uses microwave excitation technology to place micro sample 15 in a sealed vacuum glass tube to form a new microwave element lamp 1. In order to avoid the problems of overheating damage of a vacuum glass tube and poor stability caused by overlarge power of a microwave power supply, the microwave element lamp 1 selects the solid-state microwave source 5 with a tunable function as an excitation source, and provides a stable and reliable input signal for the microwave element lamp 1. The microwave generated by the solid-state microwave source 5 is connected with the connecting electrode 14 in the microwave element lamp 1 through the communication coaxial cable and the signal adapter 3, and finally is conducted to the microwave antenna 12. Under the coupling action of the excitation and shielding resonant cavity 2 of the microwave energy, the microwave excites and ionizes the substance in the inner glass tube 11, and a spectrum of the element contained in the sample 15 is generated. The sample 15 in the microwave element lamp 1 is a simple substance or a compound thereof which is easy to evaporate. The sample 15 is formed by adsorbing and settling saturated steam under certain temperature and pressure conditions, the required amount of the sample 15 is very small, and the service life of the sample 15 is greatly prolonged because the sample 15 is closed and has no escape loss. When a plurality of samples 15 having similar properties are simultaneously put into the inner glass tube 11, a multi-element lamp can be manufactured. The microwave element lamp 1 manufactured according to the invention has the characteristics of high luminous intensity, good stability, long service life and the like, and can be used as a light source of an atomic spectrum instrument.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A microwave elemental lamp, comprising: the microwave antenna comprises an inner glass tube, an outer glass tube, a microwave antenna, a connecting sheet and a connecting electrode;
the inner glass tube, the connecting sheet and the connecting electrode are all arranged in the outer glass tube; a sample is attached to the inner wall of the inner glass tube; the microwave antenna is wound on the outer wall of the inner glass tube; one end of the microwave antenna is fixed on the outer wall of the inner glass tube, and the other end of the microwave antenna is connected with one end of the connecting sheet; the other end of the connecting sheet is connected with the connecting electrode; when the device is applied, the other end of the connecting electrode is used for connecting external equipment.
2. A elemental microwave lamp according to claim 1 wherein the inner glass tube is a closed ellipsoid or a closed cylinder.
3. A elemental microwave lamp as claimed in claim 1 wherein the outer glass tube comprises: a first portion and a second portion;
the first portion is a cylinder; the second part is formed by pressing a cylinder; the second portion forms a unitary structure with the first portion.
4. A elemental microwave lamp according to claim 3, wherein the inner glass tube is disposed in the first portion of the outer glass tube; the connecting sheet and the connecting electrode are both arranged on the second part of the outer glass tube.
5. A elemental microwave lamp according to claim 3 wherein the first portion of the outer glass tube is further provided with a technical seal.
6. A elemental microwave lamp according to claim 3 wherein the longest diameter of the cross-section in the second portion is less than or equal to the diameter of the cross-section in the first portion.
7. A elemental microwave lamp as claimed in claim 1 wherein the sample is an elemental substance or a compound formed from the elemental substance that meets evaporation requirements.
8. A microwave elemental lamp applicator, comprising: a solid state microwave source, a signal adapter, a shielded resonant cavity, and a elemental microwave lamp according to any one of claims 1 to 7;
the microwave element lamp is connected with the signal adapter; the signal adapter is connected with the solid microwave source through a coaxial communication cable; the shielding resonant cavity is arranged on the signal adapter, and the microwave element lamp is arranged in the shielding resonant cavity.
9. A elemental microwave lamp applicator as in claim 8 wherein the shielded resonant cavity is formed with an opening for radiation from a light source.
10. A elemental microwave lamp applicator as claimed in claim 8 wherein the power of the solid state microwave source is less than 100W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211719724.2A CN115985756A (en) | 2022-12-30 | 2022-12-30 | Microwave element lamp and application device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211719724.2A CN115985756A (en) | 2022-12-30 | 2022-12-30 | Microwave element lamp and application device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115985756A true CN115985756A (en) | 2023-04-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211719724.2A Pending CN115985756A (en) | 2022-12-30 | 2022-12-30 | Microwave element lamp and application device thereof |
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|---|---|
| CN (1) | CN115985756A (en) |
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- 2022-12-30 CN CN202211719724.2A patent/CN115985756A/en active Pending
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