Ultraviolet lamp used in photoionization detector
By placing a metal sheet on the inner wall of the ultraviolet lamp, the free electrons are excited by the metal material under an electromagnetic field, which solves the problem of excitation delay after the PID sensor is powered on, and realizes rapid entry into working state and improved detection efficiency.
Patent Information
- Application Number
- CN202410716860.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-12-05
AI Technical Summary
Existing PID sensors and other devices cannot quickly activate and enter normal working state after power-on, affecting detection efficiency.
A metal sheet is placed on the inner wall of the ultraviolet lamp tube. The metal material or alloy in the metal sheet is more likely to generate free electrons under the action of an electromagnetic field, which helps to quickly excite inert gas molecules and improves the speed at which the ultraviolet lamp enters the working state.
By incorporating the metal plate, the ultraviolet lamp can enter working mode more quickly, improving the detector's detection efficiency.
Smart Images
Figure CN121075902A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of detection and analysis, and relates to a kind of ultraviolet lamp for photo ionization detector. BACKGROUND
[0002] Photo ionization detector (PID) is a highly sensitive sensor, which uses high-energy ultraviolet light to ionize gas molecules and realize detection, and mainly includes ultraviolet light source, sensor chamber, electronic circuit, signal processing and output unit and other components inside, wherein, ultraviolet light source as the core component of PID sensor, directly affects the detection ability and accuracy of detector, currently, low-pressure electrodeless ultraviolet lamp is generally used as the ultraviolet light source of detection device, electrodeless ultraviolet lamp has the advantages of small power consumption, small size, convenient to use and is widely used in detection device.
[0003] PID sensor is suitable for detection of volatile organic compounds (VOC) in environmental protection and industrial safety field, has the advantages of small size, rapid response, high measurement accuracy, and can be continuous and real-time monitoring, at the same time, PID sensor can detect a wide range of VOC concentration, from extremely low 1ppb (billionth) to as high as tens of thousands of ppm (millionth) concentration. This wide detection range makes PID sensor show high applicability and flexibility when detecting VOC and other toxic gases under various environmental and industrial conditions, especially in the face of disaster accidents, industrial leakage and other emergency situations, PID sensor can quickly detect the leaked chemicals, help to determine the accident area and leaked substances, so as to provide key information for emergency response and accident handling. However, in practical application, it is found that the gas detection or analysis device (for example, gas chromatograph) such as PID sensor cannot quickly excite and enter normal working state after power-on, and there is still a large space for improvement in the reliability and detection efficiency of the equipment.
[0004] Therefore, how to make the PID sensor and other equipment quickly excite to enter normal working state after power-on has become an important technical problem to be solved by the person skilled in the art.
[0005] It should be noted that the above introduction to the technical background is only to facilitate the clear and complete description of the technical scheme of the present application, and to facilitate the understanding of the person skilled in the art. The above technical scheme cannot be considered as known to the person skilled in the art only because it is described in the background section of the present application. SUMMARY
[0006] In view of the above-mentioned defects of the prior art, the purpose of the present application is to provide a UV lamp for a photo-ionization detector, which is used to solve the problem that the PID sensor and other devices in the prior art cannot be quickly excited to enter a normal working state after being powered on.
[0007] To achieve the above-mentioned purpose and other related purposes, the present application provides a UV lamp for a photo-ionization detector, which comprises a lamp tube, a metal sheet, a sealing layer and a UV light window sheet, wherein the lamp tube is filled with inert working gas, the metal sheet is arranged on the inner wall of the lamp tube, the sealing layer is connected between the lamp tube and the UV light window sheet to maintain the airtightness of the inside of the lamp tube, and the UV light window sheet allows the UV light generated by the excitation of the inert working gas to pass through.
[0008] Optionally, the metal sheet comprises at least one of a metal material and an alloy of the metal material, wherein the metal material comprises at least one of titanium, zirconium, tantalum, thorium, iron, magnesium, nickel, vanadium, aluminum, barium, gold, silver, copper, tin, lead, zinc, bismuth, cadmium, antimony and rhodium.
[0009] Optionally, the metal sheet is arranged on the inner wall of the lamp tube in at least one of the following ways: the metal sheet is circumferentially abutted on the inner side wall of the lamp tube, the metal sheet is bonded to the inner wall of the lamp tube, and the metal sheet is deposited on the inner wall of the lamp tube.
[0010] Optionally, the metal sheet is bonded to the inner wall of the lamp tube in the form of adhesive bonding, and the adhesive is an inorganic adhesive.
[0011] Optionally, the metal sheet is deposited on the inner wall of the lamp tube in at least one of the following ways: heating and melting deposition, chemical reduction deposition and in-situ nano-film deposition, and the heating and melting deposition comprises at least one of resistance wire heating, electromagnetic induction heating and direct heating.
[0012] Optionally, the UV lamp comprises only one metal sheet, and the metal sheet is arranged at the middle or tail of the inner wall of the lamp tube.
[0013] Optionally, the UV lamp comprises two metal sheets, and the two metal sheets are arranged separately, and both of the two metal sheets are located at the middle of the inner wall of the lamp tube, or both of the two metal sheets are located at the tail of the inner wall of the lamp tube, or one of the two metal sheets is located at the middle of the inner wall of the lamp tube and the other is located at the tail of the inner wall of the lamp tube.
[0014] Optionally, the ultraviolet lamp is arranged with a pair of driving electrodes, the pair of driving electrodes is arranged on the outer wall of the lamp tube to excite the inert working gas to generate ultraviolet light, and the metal sheet is arranged corresponding to the pair of driving electrodes, wherein the pair of driving electrodes comprises a first electrode and a second electrode, and each metal sheet does not span the area of the inner wall of the lamp tube corresponding to the first electrode and the second electrode.
[0015] Optionally, the metal sheet is located inside the first electrode or inside the second electrode.
[0016] Optionally, when the ultraviolet lamp comprises only one metal sheet, the metal sheet is located inside one of the first electrode and the second electrode; or when the ultraviolet lamp comprises two metal sheets, one metal sheet is located inside one of the first electrode and the second electrode, and the other metal sheet is located inside the other of the first electrode and the second electrode.
[0017] As described above, the ultraviolet lamp for photo-ionization detector of the present application, due to the arrangement of the metal sheet inside the lamp tube, the inert gas molecules in the ultraviolet lamp are excited faster, thereby effectively improving the speed of the ultraviolet lamp entering the working state, having strong applicability, and the structure, position and manufacturing method of the metal sheet are various, the overall structure is simple, easy to realize large-scale production. Further, by setting the position and structure of the metal sheet based on the position and setting method of the pair of driving electrodes used with the ultraviolet lamp, the metal sheet can more strongly sense the electromagnetic field generated by the driving alternating current and play a significant role in the escape and acceleration of electrons in the metal sheet, further improving the speed of the ultraviolet lamp entering the working state. And based on the improvement of the excitation speed of the inert working gas in the ultraviolet lamp, the detection efficiency of the photo-ionization detector equipped with the ultraviolet lamp is effectively improved. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 A first simplified structure diagram of the metal sheet in the ultraviolet lamp of the present application is shown in Example One.
[0019] Figure 2 A second simplified structure diagram of the metal sheet in the ultraviolet lamp of the present application is shown in Example One.
[0020] Figure 3 A cross-sectional view along Figure 1 A cross-sectional view along
[0021] Figure 4 A cross-sectional view along Figure 2 A cross-sectional view along
[0022] Figure 5A first simplified schematic diagram of the UV lamp of the present application is shown in Example II.
[0023] Figure 6 A second simplified schematic diagram of the UV lamp of the present application is shown in Example II.
[0024] Figure 7 A simplified schematic diagram of the UV lamp of the present application is shown with a pair of driving electrodes clamped outside.
[0025] Figure 8 A simplified schematic diagram of the UV lamp of the present application is shown with a pair of driving electrodes clamped outside.
[0026] BRIEF DESCRIPTION OF DRAWINGS
[0027] 10 lamp tube
[0028] 11 inner wall of lamp tube
[0029] 12 outer wall of lamp tube
[0030] 20 metal sheet
[0031] 30 sealing layer
[0032] 40 UV light window sheet
[0033] 51 first electrode
[0034] 52 second electrode DETAILED DESCRIPTION
[0035] The present application is herein described, by way of example only, with reference to certain embodiments thereof. It is to be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting, since the scope of the present application will be limited only by the appended claims. Numerous specific aspects of the application are set forth in the following description.
[0036] Reference will now be made to the drawings, wherein Figures 1 to 8 It is to be understood that the above-referenced arrangements are merely illustrative of the application and no limitation as to the scope of the application is intended to be implied. Additionally, any combination of the elements from the described embodiments can be provided to implement the application in various embodiments, and that the logical combination of these elements can not have been explicitly described above in order not to obscure the application. Thus, the above description is intended to be illustrative only and not restrictive.
[0037] After analyzing and verifying the problem that the gas detection device including the PID sensor in the background art cannot be quickly excited to enter the normal working state after power-on, it is found that, since the above-mentioned device tends to use a low-voltage electrodeless ultraviolet lamp as an ultraviolet light source, under normal circumstances, the low-voltage electrodeless ultraviolet lamp often needs a certain time to be excited and lit to emit ultraviolet light after an external alternating high-voltage is applied, which affects the speed of the detection device entering the working state and the detection efficiency to some extent. The reason for the above problem is that, based on the working principle of the electrodeless ultraviolet lamp, the low-pressure inert gas distributed in the ultraviolet lamp is broken down and forms a plasma state to emit ultraviolet light under the action of alternating high-voltage, and the ultraviolet light penetrates the ultraviolet light output window to reach the external environment where the ultraviolet lamp is located. In the process of exciting the inert gas, first of all, there need to be free charged ions, so that the free charged ions obtain enough energy under the acceleration of the high-voltage electric field to collide with the inert gas molecules to make them decompose into positive and negative ions, and the number of positive and negative ions increases and repeats the above process to excite the whole inert molecules, generate plasma and maintain its state to emit ultraviolet light. However, in the non-working state (without the action of external electric field), the positive and negative ions in the ultraviolet lamp will neutralize each other, resulting in only a few free charged ions in the ultraviolet lamp. When the ultraviolet lamp is powered on (the external electric field is applied), due to the lack of the number of free charged ions, the excitation process of the inert gas molecules in the ultraviolet lamp needs tens of seconds or even minutes, which makes the ultraviolet lamp have a delay after starting and cannot quickly enter the working state, thereby affecting the whole detection device to quickly work.
[0038] Based on the above analysis, the inventors summarize the following technical solution, which shortens the excitation time of the inert gas in the ultraviolet lamp to improve the speed of the ultraviolet lamp entering the working state, and then makes the PID sensor and other devices quickly excited to enter the normal working state after power-on, thereby improving the detection efficiency.
[0039] Embodiment one
[0040] The embodiment provides a kind of ultraviolet lamp (hereinafter referred to as "ultraviolet lamp") for photoionization detector, please refer to Figure 1 And Figure 2 , the ultraviolet lamp includes lamp tube 10, metal sheet 20, sealing layer 30 and ultraviolet light window piece 40.
[0041] Specifically, the lamp tube 10 is filled with inert working gas, the metal sheet 20 is arranged on the inner wall 11 of the lamp tube, the sealing layer 30 is connected between the lamp tube 10 and the ultraviolet light window piece 40 to keep the gas tightness of the lamp tube 10, and the ultraviolet light window piece 40 makes the ultraviolet light generated by exciting the inert working gas to be transmitted.
[0042] As an example, the metal sheet 20 contains at least one of a metal material and an alloy of the metal material, wherein the metal material includes at least one of titanium, zirconium, tantalum, thorium, iron, magnesium, nickel, vanadium, aluminum, barium, gold, silver, copper, tin, lead, zinc, bismuth, cadmium, antimony, and rhodium. It should be noted that the metal material must meet the requirement that its internal electrons are more likely to be detached than the electrons in the inert working gas or glass molecules under the same electromagnetic field environment. Based on this, the inventors have verified from numerous materials that the above-mentioned materials can meet the characteristic requirement. In actual application, the metal material can be selected based on the application scenario and performance requirements of the ultraviolet lamp. If only the requirement of improving the speed of the ultraviolet lamp entering the working state is considered, the metal material with relatively low work function is preferably used.
[0043] Specifically, the ultraviolet lamp of the present embodiment promotes the speed of the ultraviolet lamp entering the working state by adding a metal sheet to the inner wall of the lamp tube, using the chemical characteristics of the metal material or alloy contained in the metal sheet that is more likely to excite free electrons than inert gas molecules, and making the electrons in the material contained in the metal sheet more likely to be detached from the body than the electrons in the inert gas molecules to become free electrons under the same electromagnetic field or microwave, thereby assisting the inert gas molecules in the ultraviolet lamp to be excited faster.
[0044] As an example, the metal sheet 20 is arranged on the inner wall 11 of the lamp tube in at least one of the following ways: the metal sheet 20 abuts the inner side wall of the lamp tube in the circumferential direction, the metal sheet 20 is bonded to the inner wall 11 of the lamp tube, and the metal sheet 20 is deposited in the inner wall 11 of the lamp tube (the inner wall 11 of the lamp tube includes an inner side wall and an inner bottom wall). Among them, one way of the metal sheet 20 abutting the inner side wall of the lamp tube 10 in the circumferential direction is to use a functional material to make a separate metal sheet 20 (in the form of a ring or a ring with an opening) outside the lamp tube 10 according to the size of the inner wall 11 of the lamp tube 10, and then place the metal sheet 20 in the lamp tube 10 to make it abut the inner side wall of the lamp tube 10 by its own elasticity.
[0045] Further, the way of bonding the metal sheet 20 to the inner wall 11 of the lamp tube is adhesive bonding, and the adhesive is an inorganic adhesive.
[0046] Further, the way of depositing the metal sheet 20 in the inner wall 11 of the lamp tube includes at least one of heating and melting deposition (i.e., using heating to melt the raw material and form a film on the inner wall of the lamp tube), chemical reduction deposition (i.e., attaching a compound powder or slurry containing a functional material to a predetermined area of the inner wall of the lamp tube, and through a reduction reaction, the functional material restores its original properties while being attached to the inner wall of the lamp tube), and In-situ Nano membrane deposition. The heating and melting deposition includes at least one of resistance wire heating, electromagnetic induction heating, and direct heating.
[0047] It should be noted that the thickness and coverage area of the metal sheet can be adjusted adaptively based on the application scenario of the ultraviolet lamp, the type of material used by the metal sheet, and the like, and are not specifically limited here.
[0048] As an example, the axial projection of the metal sheet 20 is in an arc shape (as shown in Figure 3 ) or a ring shape (as shown in Figure 4 ), "axial" corresponds to the extension direction of the lamp tube 10 (as shown in Figure 1 ), "arc shape" means that the metal sheet as a whole is in an arch shape (as shown in Figure 1 ), and "ring shape" means that the metal sheet as a whole is in a ring shape (as shown in Figure 2 ).
[0049] As an example, the ultraviolet lamp only includes one metal sheet 20, which is arranged at the middle or tail of the inner wall 11 of the lamp tube. For the sake of clarity, "middle" refers to the portion of the inner wall of the lamp tube that is located in the middle in the extension direction of the lamp tube (occupying 1 / 3 of the length in the extension direction of the lamp tube), and "tail" refers to the portion of the inner wall of the lamp tube that is located on the side of the "middle" away from the ultraviolet light window sheet in the extension direction of the lamp tube. The metal sheet 20 is preferably arranged at the middle of the inner wall 11 of the lamp tube, so that the inert gas discharge is relatively uniformly excited in the entire lamp tube under the action of the electromagnetic field, thereby generating relatively uniform ultraviolet light.
[0050] As an example, the ultraviolet lamp is matched with a pair of driving electrodes for working, the pair of driving electrodes is arranged on the outer wall 12 of the lamp tube to excite the inert working gas to generate ultraviolet light, and the metal sheet 20 is arranged corresponding to the pair of driving electrodes. Each of the metal sheets 20 does not cross the region of the inner wall of the lamp tube corresponding to the first electrode 51 and the second electrode 52, that is, the first electrode is arranged on the portion of the outer wall of the lamp tube corresponding to the first region of the inner wall of the lamp tube, and the second electrode is arranged on the portion of the outer wall of the lamp tube corresponding to the second region of the inner wall of the lamp tube. The metal sheet arranged corresponding to the first electrode can be located in the portion other than the second region, and the metal sheet arranged corresponding to the second electrode can be located in the portion other than the second region.
[0051] Specifically, in this embodiment, the position and structure of the metal sheet are arranged based on the position and arrangement mode of the pair of driving electrodes used with the ultraviolet lamp, so that the metal sheet can more strongly induce the electromagnetic field generated by the driving alternating current to play a significant role in the escape and acceleration of electrons in the metal sheet. At the same time, the pair of driving electrodes can also heat the metal sheet to further improve the escape and movement effect of the electrons.
[0052] As an example, the metal sheet 20 is located at the inner side of the first electrode 51 or the inner side of the second electrode 52, where "inner side" refers to the radial direction (as shown by the dotted arrow in the figure) between the center of the lamp tube 10 and the corresponding electrode. For example, please refer to Figure 7 for a better understanding that the metal sheet 20 is located between the first electrode 51 and the center of the lamp tube 10, or the metal sheet 20 is located between the second electrode 51 and the center of the lamp tube 10. Placing the metal sheet at the inner side of the first electrode or the second electrode means that the metal sheet is only arranged in correspondence with one of the two electrodes in the radial direction, otherwise the shielding of the driving electric field will occur due to the conductive characteristics of the metal sheet itself, which will not achieve the effect of the metal sheet to promote the inert working gas to be excited faster, and even may be counterproductive. Figure 7
[0053] Further, the arrangement of the driving electrode pair on the outer wall 12 of the lamp tube includes at least one of being clamped on opposite sides of the outer wall 12 of the lamp tube (as shown in the figure) and being sleeved on the outer wall 12 of the lamp tube (as shown in the figure, where the dotted pattern represents the driving electrode pair). Further, when the driving electrode pair is clamped on the outer wall 12 of the lamp tube, the metal sheet 20 is preferably in an arch shape, and when the driving electrode pair is sleeved on the outer wall 12 of the lamp tube, the metal sheet 20 is preferably in a ring shape (i.e., the arrangement area of the metal sheet matches the arrangement area of the driving electrode pair), so as to achieve the best matching excitation effect. Figure 7 Figure 8 As an example, when the ultraviolet lamp only includes one metal sheet 20, the metal sheet 20 is located at the inner side of one of the first electrode 51 and the second electrode 52 (not shown in the figure, please refer to and
[0054] for a better understanding). Figure 7 Figure 8 As an example, the material of the ultraviolet light window sheet 40 is selected based on actual needs on the premise of meeting the high transmittance of ultraviolet light generated by the excitation of the inert working gas inside the lamp (for example, magnesium fluoride crystal), and at the same time, the material of the lamp tube 10 is preferably glass material, which has sufficient reliability.
[0055] It should be noted that the ultraviolet lamp can be applied not only to photoionization gas sensors but also to volatile organic compound gas sensors, gas chromatographs, liquid chromatographs, and ion mobility spectrometers as ultraviolet light sources. When the above-mentioned devices are applied with the ultraviolet lamp of the present embodiment, the detection efficiency is significantly improved without the need to change or adjust the structure of the components and without the need to significantly increase the product cost, which meets the application requirements of the fields and scenarios that require strict detection efficiency.
[0056] It should be noted that the ultraviolet lamp can be applied not only to photoionization gas sensors but also to volatile organic compound gas sensors, gas chromatographs, liquid chromatographs, and ion mobility spectrometers as ultraviolet light sources. When the above-mentioned devices are applied with the ultraviolet lamp of the present embodiment, the detection efficiency is significantly improved without the need to change or adjust the structure of the components and without the need to significantly increase the product cost, which meets the application requirements of the fields and scenarios that require strict detection efficiency.
[0057] The ultraviolet lamp of the embodiment has strong applicability because the metal sheet inside the lamp tube helps the inert gas molecules in the ultraviolet lamp to be excited faster, thereby effectively improving the speed of the ultraviolet lamp entering the working state. Moreover, the structure and position of the metal sheet and the position and arrangement of the driving electrode pair used in cooperation with the ultraviolet lamp are set in such a way that the metal sheet can more strongly induce the escape and acceleration of electrons in the metal sheet in the electromagnetic field generated by the driving alternating current, thereby further improving the speed of the ultraviolet lamp entering the working state. Based on the improvement of the excitation speed of the inert working gas in the ultraviolet lamp, the detection efficiency of the photoionization detector equipped with the ultraviolet lamp is effectively improved.
[0058] Embodiment Two
[0059] The embodiment provides an ultraviolet lamp (hereinafter referred to as “ultraviolet lamp”) used in a photoionization detector. The difference between the embodiment and Embodiment One is that the ultraviolet lamp in Embodiment One includes only one metal sheet, while the ultraviolet lamp in the embodiment includes two metal sheets. Please refer to Figure 5 and Figure 6 The ultraviolet lamp includes a lamp tube 10, a metal sheet 20, a sealing layer 30, and an ultraviolet light window sheet 40, Figure 5 and Figure 6 show two structure diagrams of the ultraviolet lamp with metal sheets of different positions and structures.
[0060] Specifically, the lamp tube 10 is filled with inert working gas, the metal sheet 20 is arranged on the inner wall 11 of the lamp tube, the sealing layer 30 is connected between the lamp tube 10 and the ultraviolet light window sheet 40 to maintain the airtightness of the inside of the lamp tube 10, and the ultraviolet light window sheet 40 allows the ultraviolet light generated by the excitation of the inert working gas to pass through.
[0061] As an example, the ultraviolet lamp includes two metal sheets 20, and the two metal sheets 20 are arranged separately (the “separate arrangement” means that the two metal sheets cannot be connected as a whole). Both of the two metal sheets 20 are located at the middle part of the inner wall 11 of the lamp tube, or both of the two metal sheets 20 are located at the tail part of the inner wall 11 of the lamp tube, or one metal sheet 20 is located at the middle part of the inner wall 11 of the lamp tube, and the other metal sheet 20 is located at the tail part of the inner wall 11 of the lamp tube. When the ultraviolet lamp includes two metal sheets 20, the two metal sheets 20 can be made of different materials.
[0062] As an example, the axial projection of the metal sheet 20 is in an arc shape or a ring shape (correspondingly, the metal sheet 20 is in an arch shape or a ring shape as a whole), and the “axial direction” corresponds to the extension direction of the lamp tube 10.
[0063] In an example, when the axial projection of the two metal sheets 20 is in an arc shape (as shown in Figure 5 indicated), the two metal sheets 20 are arranged towards each other in a direction perpendicular to the extension direction of the lamp 10, "towards each other" means that the projections of the two in the direction at least partially coincide, at this time, the sizes of the two metal sheets 20 can be the same or different, preferably, the two metal sheets 20 are symmetrically arranged about the central axis of the extension direction of the lamp 10 (i.e. have the same length, width and other sizes).
[0064] In another example, when the axial projection of the two metal sheets 20 is in a ring shape (as shown in Figure 6 indicated), the two metal sheets 20 are staggered by a preset distance in the extension direction of the lamp 10, for example, one metal sheet 20 is located at the middle of the inner wall 11 of the lamp, and the other metal sheet 20 is located at the tail of the inner wall 11 of the lamp, or both are located at the middle of the inner wall 11 of the lamp, or both are located at the tail of the inner wall 11 of the lamp, the first distribution is preferred, on the one hand, it is convenient for subsequent realization of uniform excitation of the inert working gas in the lamp, on the other hand, it avoids the time interval being too small when cooperating with the external alternating high-voltage output device (for example, the driving electrode pair) and affects the reliability.
[0065] As an example, when the ultraviolet lamp includes two metal sheets 20, one metal sheet 20 is located inside one of the first electrode 51 and the second electrode 52, and the other metal sheet 20 is located inside the other of the first electrode 51 and the second electrode 52 (as shown in Figure 7 and Figure 8 indicated).
[0066] The ultraviolet lamp of the embodiment improves the structure of the metal sheet on the basis of the first embodiment, further improves the speed of the ultraviolet lamp entering the working state, and can realize flexible design of the structure of the ultraviolet lamp to meet different application requirements.
[0067] In summary, the ultraviolet lamp used in photo-ionization detector of the present application, due to the setting of the metal sheet inside the lamp tube, the inert gas molecules in the ultraviolet lamp are excited faster, thereby effectively improving the speed of the ultraviolet lamp into the working state, has strong applicability, and the structure, position and manufacturing method of the metal sheet are various, the overall structure is simple, easy to realize large-scale production. Further, by setting the position and structure of the metal sheet based on the position and setting method of the driving electrode pair used with the ultraviolet lamp, the metal sheet can more strongly induce the electromagnetic field generated by the driving alternating current to play a significant role in the escape and acceleration of electrons in the metal sheet, further improving the speed of the ultraviolet lamp into the working state. And based on the improvement of the excitation speed of the inert working gas in the ultraviolet lamp, the detection efficiency of the photo-ionization detector equipped with the ultraviolet lamp is effectively improved. Therefore, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.
[0068] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.
Claims
1. An ultraviolet lamp for use in a photoionization detector, characterized by: The ultraviolet lamp comprises a lamp tube, a metal sheet, a sealing layer and an ultraviolet light window sheet, wherein the lamp tube is filled with inert working gas, the metal sheet is arranged on the inner wall of the lamp tube, the sealing layer is connected between the lamp tube and the ultraviolet light window sheet to keep the airtightness of the inside of the lamp tube, and the ultraviolet light window sheet allows the ultraviolet light generated by the excitation of the inert working gas to pass through.
2. The ultraviolet lamp of claim 1, wherein: The metal sheet comprises at least one of a metal material and an alloy of the metal material, wherein the metal material comprises at least one of titanium, zirconium, tantalum, thorium, iron, magnesium, nickel, vanadium, aluminum, barium, gold, silver, copper, tin, lead, zinc, bismuth, cadmium, antimony and rhodium.
3. The ultraviolet lamp of claim 1, wherein: The metal sheet is arranged on the inner wall of the lamp tube in at least one of the following ways: the metal sheet abuts the inner wall of the lamp tube in the circumferential direction, the metal sheet is bonded to the inner wall of the lamp tube, and the metal sheet is deposited on the inner wall of the lamp tube.
4. The ultraviolet lamp of claim 3, wherein: The metal sheet is bonded to the inner wall of the lamp tube by means of an adhesive, and the adhesive is an inorganic adhesive.
5. The ultraviolet lamp of claim 3, wherein: The metal sheet is deposited on the inner wall of the lamp tube by at least one of the following methods: heating melting deposition, chemical reduction deposition and in-situ nano film deposition, and the heating melting deposition comprises at least one of resistance wire heating, electromagnetic induction heating and direct heating.
6. The ultraviolet lamp of claim 1, wherein: The ultraviolet lamp comprises only one metal sheet, and the metal sheet is arranged at the middle or tail of the inner wall of the lamp tube.
7. The ultraviolet lamp of claim 1, wherein: The ultraviolet lamp comprises two metal sheets, and the two metal sheets are arranged separately, and both of the two metal sheets are arranged at the middle of the inner wall of the lamp tube, or both of the two metal sheets are arranged at the tail of the inner wall of the lamp tube, or one of the two metal sheets is arranged at the middle of the inner wall of the lamp tube and the other is arranged at the tail of the inner wall of the lamp tube.
8. The ultraviolet lamp according to claim 6 or 7, characterized in that: The ultraviolet lamp is matched with a pair of driving electrodes arranged on the outer wall of the lamp tube to excite the inert working gas to generate ultraviolet light, and each metal sheet is arranged corresponding to the pair of driving electrodes, wherein the pair of driving electrodes comprises a first electrode and a second electrode, and each metal sheet does not cross the region of the inner wall of the lamp tube corresponding to the first electrode and the second electrode.
9. The ultraviolet lamp of claim 1, wherein: The metal sheet is arranged inside the first electrode or inside the second electrode.
10. The ultraviolet lamp of claim 1, wherein: When the ultraviolet lamp comprises only one metal sheet, the metal sheet is arranged inside one of the first electrode and the second electrode; or when the ultraviolet lamp comprises two metal sheets, one of the two metal sheets is arranged inside one of the first electrode and the second electrode, and the other of the two metal sheets is arranged inside the other of the first electrode and the second electrode.