Method and system for non-destructive measurement of alkali content of alkali metal cells

Abstract

The application provides a method and system for nondestructive measurement of alkali metal content in an alkali metal cell, comprising: driving the alkali metal; selecting one side light transmission surface as a calibration surface, and scanning and detecting a first distance between the calibration surface and a laser to obtain a first surface distribution diagram H1(x, y) between the calibration surface and the laser; driving the alkali metal to the calibration surface; shooting an image pixel corresponding to an actual area size to obtain a scale; calculating and obtaining a shadow area to obtain a horizontal plane distribution diagram S(x, y) of the alkali metal cluster on the inner wall surface of the cell; using a laser ranging technology to obtain a second surface distribution diagram H2(x, y) between the calibration surface and the laser; calculating and obtaining a height distribution diagram Delta H(x, y) of the alkali metal cluster on the inner wall surface of the cell; calculating and obtaining a volume distribution diagram of the alkali metal cluster on each pixel point, summing up to obtain a total volume of the alkali metal, and calculating and obtaining a mass of the alkali metal according to the volume. The technical scheme of the application is used to solve the technical problem that the nondestructive measurement cannot obtain accurate uncertainty indexes in the prior art.

Description

Technical Field

[0001] This invention relates to the field of quantum sensing technology, and in particular to a method and system for non-destructive measurement of alkali metal content in an alkali metal gas chamber. Background Technology

[0002] In recent years, alkali metal atomic sensor technology has been continuously developing due to its advantages such as high sensitivity, miniaturization, and low power consumption, and has been applied in many popular fields. For example, alkali metal atomic clocks are used for timekeeping and satellite navigation, while alkali metal atomic magnetometers are used for mineral exploration and biomagnetic exploration. The alkali metal atomic gas chamber is the core component of the alkali metal atomic sensor, used to provide a stable and reliable atomic signal. Typically, the alkali metal gas chamber is made of glass to achieve high light transmittance and low absorption loss to meet the needs of laser detection. However, alkali metal atoms have strong oxidizing properties, while glass materials are porous. Therefore, polluting gases will continuously and slowly release from the inner wall of the gas chamber and react with the alkali metals, leading to a decrease in the number of atoms, a reduction in the effective signal, and affecting the high performance of the atomic sensor. Therefore, the ability to non-destructively determine the alkali metal content in a sealed gas chamber is of great significance for improving the lifespan of atomic sensors and extending their effective working time.

[0003] Currently, methods for testing alkali metal content in gas chambers are mainly divided into two types: destructive testing and non-destructive testing. Destructive testing involves destroying the alkali metal chamber in a vacuum environment, quantitatively introducing an oxidant to react with the alkali metal, and then calculating the alkali metal content. This method causes irreversible damage to the chamber, making repeatable testing difficult. Non-destructive testing methods mainly include two types: DSC (Digital Subtraction Angiography) and image recognition. The DSC method utilizes the specific melting point and specific heat capacity of alkali metals to determine the alkali metal content by measuring the endothermic peak. This method has a very large error, exceeding 50%, in determining the content of trace alkali metals. Image recognition uses microscopic scanning to determine the circular base area of ​​the alkali metal chamber and theoretically infers its volume. However, the theoretical calculation method is an ideal model, which differs significantly from reality and cannot yield accurate uncertainty indicators. Summary of the Invention

[0004] This invention provides a method and system for non-destructive measurement of alkali metal content in alkali metal chambers, which can solve the technical problem that non-destructive measurement in the prior art cannot obtain accurate uncertainty index.

[0005] According to one aspect of the present invention, a method for non-destructively measuring the alkali metal content in an alkali metal gas chamber is provided. The method includes: driving away the alkali metal in the atomic gas chamber; attaching heating plates to the outer surfaces of two opposing light-transmitting surfaces of the atomic gas chamber; baking the light-transmitting surfaces at high temperature, where the surrounding temperature is low and the light-transmitting surface temperature is high, causing the alkali metal to accumulate on the inner walls around the atomic gas chamber, while no alkali metal accumulates on the light-transmitting surfaces, forming a pair of clean light-transmitting surfaces; selecting one light-transmitting surface as a calibration surface, with the calibration range being the coverage area of ​​the heating plates; using laser ranging technology to scan and detect the first distance between the calibration surface and the laser, obtaining a first surface distance distribution map H1(x,y) between the calibration surface and the laser; driving the alkali metal in the atomic gas chamber to the calibration surface; calibrating the actual area size corresponding to the pixels in the microscope image to obtain a scale bar ξ; placing the alkali metal gas chamber under a microscope, where some areas are blocked by alkali metal adhesion, forming a shadow. The process involves: 1) photographing and recording the shadow pattern; 2) identifying the number of pixels N corresponding to the shadow area; 3) calculating the shadow area using a calibrated scale ξ to obtain the horizontal distribution map S(x,y) of alkali metal clusters on the inner wall surface of the gas chamber; 4) using laser ranging technology to scan and detect the second distance between the calibrated surface and the laser to obtain the second surface distribution map H2(x,y) of the distance between the calibrated surface and the laser; 5) subtracting the first and second surface distribution maps to obtain the height distribution map ΔH(x,y) of alkali metal clusters on the inner wall surface of the gas chamber; 6) multiplying the horizontal distribution map S(x,y) and the height distribution map ΔH(x,y) to obtain the volume distribution map V(x,y) = S(x,y) * ΔH(x,y) of alkali metal clusters at each pixel; 7) summing the volumes of alkali metal clusters at all pixels to obtain the total volume of alkali metal in the gas chamber V = ∑V(x,y); and 8) calculating the mass of alkali metal based on the total volume of alkali metal in the gas chamber.

[0006] Furthermore, the shadow area S is calculated according to S = N * ξ, where N is the number of pixels corresponding to the shadow part of the image recognition, and ξ is the calibrated scale.

[0007] Furthermore, the mass of the alkali metal can be calculated using the formula M = ρ * V, where ρ is the density of the alkali metal and V is the volume of the total alkali metal in the chamber.

[0008] Furthermore, driving the alkali metals in the atomic gas chamber to the calibration surface specifically includes: covering all outer surfaces of the gas chambers except the calibration surface with heating plates, so that the alkali metals are enriched on the calibration surface and form multiple alkali metal condensation clusters.

[0009] Furthermore, calibrating the actual area size corresponding to each pixel in the microscope image to obtain the scale ξ specifically includes: selecting an origin point inside the microscope, horizontally moving the origin point using a high-precision displacement platform, recording the moving distance and the number of pixels that the origin point moves on the captured image, obtaining the area size corresponding to a single pixel point, and recording it as the scale ξ.

[0010] Furthermore, the atomic gas chamber is a cylindrical gas chamber, and alkali metals include rubidium.

[0011] According to another aspect of the present invention, a system for non-destructive measurement of alkali metal content in an alkali metal chamber is provided, wherein the system uses the method described above for non-destructive measurement of alkali metal content in an alkali metal chamber to measure the alkali metal content.

[0012] This invention provides a non-destructive method for measuring the alkali metal content in alkali metal chambers. This method, based on image recognition, further improves accuracy. First, a microscope scan is used to determine the bottom area of ​​the alkali metal. Then, laser ranging technology is used to determine the actual height of the alkali metal buildup, thereby experimentally calculating the alkali metal volume and ultimately the alkali metal mass. This method is entirely based on actual data measurement, without theoretical estimation, and can accurately provide the uncertainty (depending on the testing accuracy). It has significant advantages for measuring alkali metal content in chambers with trace amounts of alkali metal. Attached Figure Description

[0013] The accompanying drawings, which form part of this specification, are provided to further illustrate embodiments of the invention and, together with the textual description, explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0014] Figure 1 A flowchart of a method for non-destructive measurement of alkali metal content in an alkali metal chamber according to a specific embodiment of the present invention is shown;

[0015] Figure 2 A schematic diagram of the structure of an atomic gas chamber provided according to a specific embodiment of the present invention is shown. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0018] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0019] like Figure 1As shown, a method for non-destructively measuring the alkali metal content in an alkali metal gas chamber is provided according to a specific embodiment of the present invention. This method includes: driving away the alkali metal in the atomic gas chamber; attaching heating plates to the outer surfaces of two opposing light-transmitting surfaces of the atomic gas chamber; baking the light-transmitting surfaces at high temperature, resulting in a low temperature around the perimeter and a high temperature on the light-transmitting surfaces, causing the alkali metal to accumulate on the inner walls around the atomic gas chamber, while no alkali metal accumulates on the light-transmitting surfaces, forming a pair of clean light-transmitting surfaces; selecting one light-transmitting surface as a calibration surface, with the calibration range being the coverage area of ​​the heating plates; using laser ranging technology to scan and detect the first distance between the calibration surface and the laser, obtaining a first surface distribution map H1(x,y) of the distance between the calibration surface and the laser; driving the alkali metal in the atomic gas chamber to the calibration surface; calibrating the actual area size corresponding to the pixels in the microscope image to obtain a scale bar ξ; placing the alkali metal gas chamber under a microscope, where some areas are blocked by alkali metal adhesion, causing light obstruction. A shadow is formed, and the shadow pattern is photographed and recorded. The number of pixels N corresponding to the shadow area is identified by image recognition. Using the calibrated scale ξ, the shadow area is calculated to obtain the horizontal distribution map S(x,y) of alkali metal clusters on the inner wall surface of the gas chamber. Using laser ranging technology, the second distance between the calibration surface and the laser is detected by point scanning to obtain the second distribution map H2(x,y) of the distance between the calibration surface and the laser. The first distribution map is subtracted from the second distribution map to obtain the height distribution map ΔH(x,y) of alkali metal clusters on the inner wall surface of the gas chamber. The horizontal distribution map S(x,y) of alkali metal clusters on the inner wall surface of the gas chamber is multiplied by the height distribution map ΔH(x,y) to obtain the volume distribution map V(x,y) = S(x,y) * ΔH(x,y) of alkali metal clusters at each pixel. The volume of alkali metal clusters at all pixels is summed to obtain the total volume of alkali metal in the gas chamber V = ∑V(x,y). The mass of alkali metal is calculated based on the total volume of alkali metal in the gas chamber.

[0020] This configuration provides a non-destructive method for measuring the alkali metal content in alkali metal chambers. Based on image recognition, this method further improves accuracy. First, a microscope scan is used to determine the bottom area of ​​the alkali metal, then laser ranging technology is used to determine the actual stacking height of the alkali metal, thereby experimentally calculating the volume of the alkali metal and ultimately its mass. This method is entirely based on actual data measurement, without theoretical estimation, and can accurately provide the uncertainty (depending on the testing precision). It has significant advantages for measuring alkali metal content in chambers with trace amounts of alkali metal.

[0021] Specifically, in this invention, in order to test the alkali metal content, the alkali metal in the atomic gas chamber is first driven away. Heating plates are attached to the outer surfaces of the two opposing light-transmitting surfaces of the atomic gas chamber, and the light-transmitting surfaces are baked at high temperature. At this time, the temperature around the chamber is low and the temperature of the light-transmitting surface is high. The alkali metal is enriched on the inner wall around the atomic gas chamber, and there is no alkali metal enrichment on the light-transmitting surface of the gas chamber, thus forming a pair of clean light-transmitting surfaces of the gas chamber.

[0022] In a specific embodiment of the present invention, the atomic gas chamber is a cylindrical gas chamber, and the alkali metal includes rubidium. The alkali metal within the atomic gas chamber is expelled. Taking a cylindrical gas chamber and rubidium as an example, heating plates of suitable size are attached to the outer surfaces of two opposing light-transmitting surfaces. The light-transmitting surfaces are then baked at high temperature. At this time, the surrounding temperature is low, while the temperature of the light-transmitting surfaces is high. The alkali metal accumulates on the inner wall of the cylinder around the gas chamber, while no alkali metal accumulates on the light-transmitting surfaces of the gas chamber, forming a pair of clean light-transmitting surfaces.

[0023] Furthermore, one side of the light-transmitting surface is selected as the calibration surface, and the calibration range is the coverage area of ​​the heating element. Using laser ranging technology, the first distance between the calibration surface and the laser is detected by point scanning, and the first surface distribution map H1(x,y) of the distance between the calibration surface and the laser is obtained.

[0024] Next, the alkali metals in the atomic gas chamber are driven to the calibration surface. To facilitate testing and reduce testing errors, heating plates are attached to the outer surfaces of all gas chambers except the calibration surface, causing the alkali metals to accumulate on the calibration surface and form multiple alkali metal condensation clusters.

[0025] Furthermore, the actual area size corresponding to each pixel in the microscope image is calibrated to obtain the scale bar ξ. First, an origin is selected inside the microscope, and the origin is horizontally moved using a high-precision displacement platform. The moving distance and the number of pixels that the origin moves in the captured image are recorded to obtain the area size corresponding to a single pixel, which is recorded as the scale bar ξ (unit: square micrometers per pixel).

[0026] After obtaining the scale ξ, the alkali metal chamber can be placed under a microscope. At this time, some areas will be shaded due to the presence of alkali metal, causing light to be blocked. The shadow pattern is then photographed and recorded. The number of pixels N corresponding to the shadow area is identified by image recognition. Using the calibrated scale ξ, the shadow area is calculated to obtain the horizontal distribution map S(x,y) of the alkali metal clusters on the inner wall surface of the chamber. In this invention, the shadow area S is calculated according to S=N*ξ, where N is the number of pixels corresponding to the shadow area identified by image recognition, and ξ is the calibrated scale.

[0027] Furthermore, using laser ranging technology, a second distance between the calibration surface and the laser is detected by point scanning, resulting in a second surface distribution map H2(x,y) of the distance between the calibration surface and the laser. The first surface distribution map is subtracted from the second surface distribution map to obtain the height distribution map ΔH(x,y) of the alkali metal clusters on the inner wall surface of the gas chamber.

[0028] Finally, the horizontal distribution map S(x,y) of alkali metal clusters on the inner wall surface of the gas chamber is multiplied by the corresponding height distribution map ΔH(x,y) to obtain the volume distribution map of alkali metal clusters at each pixel point, V(x,y) = S(x,y) * ΔH(x,y). The volumes of alkali metal clusters at all pixels are summed to obtain the total volume of alkali metal in the gas chamber, V = ∑V(x,y). The mass of alkali metal is then calculated based on the total volume of alkali metal in the gas chamber. In this invention, the mass of alkali metal can be calculated using M = ρ * V, where ρ is the density of alkali metal and V is the volume of the total alkali metal in the gas chamber.

[0029] According to another aspect of the present invention, a system for non-destructive measurement of alkali metal content in an alkali metal chamber is provided, wherein the system uses the method described above for non-destructive measurement of alkali metal content in an alkali metal chamber to measure the alkali metal content.

[0030] To gain a further understanding of the present invention, the following description is provided in conjunction with... Figure 1 and Figure 2 The method for non-destructive measurement of alkali metal content in alkali metal chambers provided by this invention will be described in detail.

[0031] like Figure 1 and Figure 2 As shown in the figure, a method for non-destructively measuring the alkali metal content in an alkali metal chamber is provided according to a specific embodiment of the present invention. The method specifically includes the following steps.

[0032] Step 1: Drive away the alkali metal in the atomic gas chamber. Taking a cylindrical gas chamber and rubidium as an example, attach heating plates of appropriate size to the outer surfaces of the two facing light-transmitting surfaces. Bake the light-transmitting surfaces at high temperature. At this time, the temperature around the perimeter is low and the temperature of the light-transmitting surfaces is high. The alkali metal is enriched on the inner wall of the cylinder around the gas chamber, and there is no alkali metal enrichment on the light-transmitting surfaces of the gas chamber, forming a pair of clean light-transmitting surfaces of the gas chamber.

[0033] Step 2: Select one side of the surface as the calibration surface, and the calibration range is the coverage area of ​​the heating element. Using laser ranging technology, point scan to detect the first distance between the calibration surface and the laser, and obtain the first surface distribution map H1(x,y) of the distance between the calibration surface and the laser.

[0034] Step 3: Drive the alkali metal to the calibration surface and cover the outer surface of all the gas chambers except the calibration surface with heating plates. The alkali metal is enriched on the calibration surface, forming multiple rubidium condensation clusters.

[0035] Step four: calibrate the actual area size corresponding to each pixel in the microscope image to obtain the scale. First, select an origin point inside the microscope. Use a high-precision displacement platform to move the origin point horizontally, and record the displacement distance and the number of pixels that the origin point moves in the captured image. This gives the area size corresponding to a single pixel, which is recorded as the scale ξ (unit: square micrometers per pixel).

[0036] Step 5: Place the alkali metal gas chamber under a microscope. At this point, some areas will be shaded due to rubidium adhesion, causing light blockage. Record the shadow pattern by photographing the shadow. Identify the number of pixels N corresponding to the shadowed area from the image, and use the calibrated scale ξ to obtain the shadow area S = N*ξ. Simultaneously, obtain the horizontal distribution map S(x,y) of rubidium clusters on the inner wall surface of the gas chamber.

[0037] Step 6: Using laser ranging technology, point scan to detect the second distance between the calibration surface and the laser, and obtain the second surface distribution map H2(x,y) of the distance between the calibration surface and the laser; Subtract the first surface distribution map from the second surface distribution map to obtain the height distribution map ΔH(x,y) of the rubidium clusters on the inner wall surface of the gas chamber;

[0038] Step 7: Multiply the horizontal distribution map S(x,y) of rubidium clusters on the inner wall surface of the gas chamber by the corresponding height distribution map ΔH(x,y) to obtain the volume distribution map V(x,y) = S(x,y) * ΔH(x,y) for each pixel. Summing these values ​​yields the total volume of rubidium alkali metal in the gas chamber, V = ∑V(x,y). The mass of rubidium alkali metal is M = ρ * V (ρ is the density of the alkali metal).

[0039] In summary, this invention provides a non-destructive method for measuring the alkali metal content in alkali metal chambers. This method, based on image recognition, further improves accuracy. First, a microscope scan is used to determine the bottom area of ​​the alkali metal, then laser ranging technology is used to determine the actual height of the alkali metal buildup, thereby experimentally calculating the alkali metal volume and ultimately the alkali metal mass. This method is entirely based on actual data measurement, without theoretical estimation, and can accurately provide the uncertainty (depending on the testing precision). It has significant advantages for measuring alkali metal content in chambers with trace amounts of alkali metal.

[0040] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0041] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for non-destructively measuring the alkali metal content in an alkali metal gas chamber, characterized in that, The method for non-destructive measurement of alkali metal content in alkali metal chambers includes: The alkali metals in the atomic gas chamber are driven away. Heating plates are attached to the outer surfaces of the two opposite light-transmitting surfaces of the atomic gas chamber. The light-transmitting surfaces are baked at high temperature. At this time, the temperature around the chamber is low and the temperature of the light-transmitting surface is high. The alkali metals are enriched on the inner walls around the atomic gas chamber. There is no alkali metal enrichment on the light-transmitting surface of the gas chamber, forming a pair of clean light-transmitting surfaces of the gas chamber. One side of the light-transmitting surface is selected as the calibration surface, and the calibration range is the coverage area of ​​the heating element. Using laser ranging technology, the first distance between the calibration surface and the laser is detected by point scanning, and the first surface distribution map H1(x,y) of the distance between the calibration surface and the laser is obtained. The alkali metal in the atomic gas chamber is driven to the calibration surface; The scale bar ξ is obtained by calibrating the pixels in the microscope image to correspond to the actual area size. When the alkali metal chamber is placed under a microscope, some areas will be shaded due to the presence of alkali metal, causing light to be blocked. The shadow pattern is recorded by taking a picture. The number of pixels N corresponding to the shadow area is identified by the image. The shadow area is calculated using the calibrated scale ξ, and the horizontal distribution map S(x,y) of alkali metal clusters on the inner wall surface of the chamber is obtained. Using laser ranging technology, a second distance between the calibration surface and the laser is detected by point scanning, resulting in a second surface distribution map H2(x,y) of the distance between the calibration surface and the laser. The first surface distribution map is subtracted from the second surface distribution map to obtain the height distribution map ΔH(x,y) of the alkali metal clusters on the inner wall surface of the gas chamber. Multiply the horizontal distribution map S(x,y) of the alkali metal clusters on the inner wall of the gas chamber by the corresponding height distribution map ΔH(x,y) to obtain the volume distribution map V(x,y) = S(x,y) * ΔH(x,y) of the alkali metal clusters at each pixel. Sum the volumes of the alkali metal clusters at all pixels to obtain the total volume of alkali metal in the gas chamber V = ∑V(x,y). Calculate the mass of the alkali metal based on the total volume of alkali metal in the gas chamber.

2. The method for non-destructive measurement of alkali metal content in an alkali metal gas chamber according to claim 1, characterized in that, The shadow area S is calculated according to S = N * ξ, where N is the number of pixels corresponding to the shadow part of the image recognition, and ξ is the calibrated scale.

3. The method for non-destructive measurement of alkali metal content in an alkali metal gas chamber according to claim 1, characterized in that, The mass of the alkali metal is calculated using the formula M = ρ * V, where ρ is the density of the alkali metal and V is the volume of the total alkali metal in the chamber.

4. The method for non-destructive measurement of alkali metal content in an alkali metal gas chamber according to claim 3, characterized in that, The process of driving the alkali metal in the atomic gas chamber to the calibration surface specifically includes: covering the outer surface of all gas chambers except the calibration surface with heating plates, so that the alkali metal is enriched on the calibration surface and forms multiple alkali metal condensation clusters.

5. The method for non-destructive measurement of alkali metal content in an alkali metal gas chamber according to claim 4, characterized in that, The process of calibrating the actual area size corresponding to each pixel in a microscope image and obtaining the scale ξ includes: selecting an origin point inside the microscope, horizontally moving the origin point using a high-precision displacement platform, recording the moving distance and the number of pixels that the origin point moves in the captured image, and obtaining the area size corresponding to a single pixel point, which is recorded as the scale ξ.

6. The method for non-destructive measurement of alkali metal content in an alkali metal gas chamber according to claim 5, characterized in that, The atomic gas chamber is a cylindrical gas chamber, and the alkali metal includes rubidium.

7. A system for non-destructive measurement of alkali metal content in an alkali metal gas chamber, characterized in that, The system for nondestructive measurement of alkali metal content in alkali metal chambers uses the method for nondestructive measurement of alkali metal content in alkali metal chambers as described in any one of claims 1 to 6 to measure the alkali metal content.

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