Ultraviolet and visible light common aperture zoom system for alpha particle visual detection

Abstract

The invention relates to an ultraviolet and visible light common-aperture zoom system for alpha particle visual detection, belongs to the technical field of optical devices, and solves the problems that existing detection equipment cannot synchronously perform ultraviolet and visible light imaging and the observation field is fixed. The system comprises a first fixed lens group, a zoom lens group, a compensation lens group, a beam splitter prism, a second fixed lens group and a third fixed lens group, all the fixed lens groups are fixedly arranged, the zoom lens group and the compensation lens group move in the direction of an optical axis to achieve zooming, the beam splitter prism divides a light beam into an ultraviolet path and a visible light path, and the second fixed lens group and the third fixed lens group are arranged in parallel. And the two lenses are imaged on the corresponding image sensors through the second fixed lens group and the third fixed lens group respectively. According to the invention, through the adoption of the common aperture and the cooperative movement of the zoom lens group and the compensation lens group, the system can realize continuous zooming and can carry out ultraviolet light and visible light imaging in different view fields at the same time, the distortion degree is small, and the high-quality imaging effect can be stably output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical devices, in particular to an ultraviolet and visible light co-aperture zoom system for alpha particle visualization detection. BACKGROUND

[0002] In the field of nuclear industry and related safety monitoring, the detection of alpha surface contamination is one of the important contents. When alpha particles propagate in the air, they can excite air molecules, and then release fluorescence in the de-excitation process. The fluorescence spectrum is mainly concentrated in the range of 300-400 nm. By detecting the fluorescence, non-contact and visual positioning of alpha particles can be realized.

[0003] Currently, the detection of alpha surface contamination mainly relies on handheld surface contamination measuring instruments or physical wiping methods. These methods require workers to hold the instrument close to the contamination source for measurement. However, for complex or narrow space (such as the inside of a pipe, the gap of a device) detection, it is often difficult for personnel or instruments to reach the scene, resulting in detection difficulties, low efficiency, and potential safety risks.

[0004] There are existing technologies that use ultraviolet lenses to detect alpha particles, but most of them are fixed-focus lenses. Although they can image alpha fluorescence at a specific distance, they have obvious shortcomings. On the one hand, they cannot simultaneously image ultraviolet and visible light bands, making it difficult to quickly and intuitively determine the specific location of the contamination source in complex field environments. On the other hand, the fixed-focus design limits the observation range, making it impossible to balance the rapid detection of large areas and the detailed observation of small areas.

[0005] Therefore, there is an urgent need for an optical system that can work in both ultraviolet and visible light bands and has continuous zoom capability. SUMMARY

[0006] To overcome the problem that existing alpha particle visualization detection equipment cannot simultaneously perform ultraviolet / visible light imaging and has a fixed observation field of view, the present application provides an ultraviolet and visible light co-aperture zoom system for alpha particle visualization detection. This system can simultaneously image ultraviolet fluorescence and visible light scenes with high resolution, and can seamlessly switch from wide-angle search to long-focus detail observation through continuous zoom, greatly improving the detection efficiency and positioning accuracy of alpha particle visualization detection.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] A UV and visible light co-aperture zoom system for visual detection of alpha particles, comprising a first fixed lens group, a zoom lens group, a compensation lens group, a beam splitter, a second fixed lens group, and a third fixed lens group, wherein the first fixed lens group, the compensation lens group, the second fixed lens group, and the third fixed lens group all have positive optical power, and the zoom lens group has negative optical power;

[0009] The first fixed lens group, the zoom lens group, the compensation lens group, and the beam splitter are arranged sequentially from the object plane to the image plane along the optical axis. The beam splitter splits the light beam into an ultraviolet beam and a visible beam. The ultraviolet beam is received by an ultraviolet-adaptive CCD image sensor after passing through the second fixed lens group, and the visible beam is received by a visible-adaptive CCD image sensor after passing through the third fixed lens group.

[0010] The first fixed lens group, the second fixed lens group, and the third fixed lens group are fixedly arranged. The zoom lens group and the compensation lens group move along the optical axis to achieve zoom. The system has the shortest focal length and the largest field of view when the zoom lens group is at the leftmost end of its movement range and the compensation lens group is at the rightmost end of its movement range. The focal length range is 50mm-200mm.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) By rationally allocating the optical power of the lens group and coordinating the movement of the zoom lens group and the compensation lens group, the system can achieve continuous zoom in the focal length range of 50mm (wide-angle end) to 200mm (telephoto end). The zoom process has the advantages of smooth image transition and low distortion, and can stably output high-quality imaging effect.

[0013] (2) The present invention uses a beam splitter to split the light, and combined with the second fixed lens group and the third fixed lens group, it can simultaneously collect spectral information of α particles in the ultraviolet band (310-370nm) and the visible band (486-656nm). It can perform ultraviolet and visible light imaging of α particles under different fields of view. Operators can intuitively locate the source of pollution in the visible light image and accurately identify the pollution source on the fused ultraviolet image, thus realizing multi-dimensional information acquisition and accurate positioning.

[0014] (3) The present invention adopts a common aperture design, and the ultraviolet and visible light paths share most of the optical components, resulting in a compact structure and strong practicality. Attached Figure Description

[0015] Figure 1A structural schematic diagram of an ultraviolet and visible light co-aperture zoom system for alpha particle visual detection provided by an embodiment of the application is shown.

[0016] Figure 2 A modulation transfer function diagram of a short focal length of the system provided by an embodiment of the application under an ultraviolet waveband is shown.

[0017] Figure 3 A modulation transfer function diagram of a short focal length of the system provided by an embodiment of the application under a visible light waveband is shown.

[0018] Figure 4 A modulation transfer function diagram of a middle focal length of the system provided by an embodiment of the application under an ultraviolet waveband is shown.

[0019] Figure 5 A modulation transfer function diagram of a middle focal length of the system provided by an embodiment of the application under a visible light waveband is shown.

[0020] Figure 6 A modulation transfer function diagram of a long focal length of the system provided by an embodiment of the application under an ultraviolet waveband is shown.

[0021] Figure 7 A modulation transfer function diagram of a long focal length of the system provided by an embodiment of the application under a visible light waveband is shown.

[0022] Figure 8 A distortion diagram of a short focal length of the system provided by an embodiment of the application under an ultraviolet waveband is shown.

[0023] Figure 9 A distortion diagram of a short focal length of the system provided by an embodiment of the application under a visible light waveband is shown.

[0024] Figure 10 A distortion diagram of a middle focal length of the system provided by an embodiment of the application under an ultraviolet waveband is shown.

[0025] Figure 11 A distortion diagram of a middle focal length of the system provided by an embodiment of the application under a visible light waveband is shown.

[0026] Figure 12 A distortion diagram of a long focal length of the system provided by an embodiment of the application under an ultraviolet waveband is shown.

[0027] Figure 13 A distortion diagram of a long focal length of the system provided by an embodiment of the application under a visible light waveband is shown.

[0028] Figure 14 A moving curve diagram of a variable magnification lens group and a compensation lens group in the system provided by an embodiment of the application is shown.

[0029] Explanation of reference numerals: G1, first fixed lens group; G2, variable magnification lens group; G3, compensation lens group; G4, second fixed lens group; G5, third fixed lens group G5; L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; L7, seventh lens; L8, eighth lens; L9, ninth lens; L10, tenth lens; L11, eleventh lens; L12, twelfth lens; L13, thirteenth lens; L14, fourteenth lens; L15, light splitting prism; L16, first diaphragm; L17, fifteenth lens; L18, sixteenth lens; L19, seventeenth lens; L20, eighteenth lens; L21, nineteenth lens; L22, twentieth lens; L23, second diaphragm; L24, twenty-first lens; L25, twenty-second lens; L26, twenty-third lens; L27, twenty-fourth lens; L28, twenty-fifth lens; L29, twenty-sixth lens; L30, twenty-seventh lens. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are only used to explain the present application and do not constitute a limitation on the protection scope of the present application.

[0031] As shown in Figure 1 The present embodiment provides an ultraviolet and visible light co-aperture zoom system for alpha particle visual detection, which comprises a first fixed lens group G1, a variable magnification lens group G2, a compensation lens group G3, a light splitting prism L15, a second fixed lens group G4, and a third fixed lens group G5, and the first fixed lens group G1 has positive refractive power, the variable magnification lens group G2 has negative refractive power, the first compensation lens group G3 has positive refractive power, the second fixed lens group G4 has positive refractive power, and the third fixed lens group G5 has positive refractive power. Optionally, the first fixed lens group G1, the variable magnification lens group G2, the compensation lens group G3, the second fixed lens group G4, and the third fixed lens group G5 are arranged in the same lens barrel (not shown in the figure).

[0032] The first fixed lens group G1, the variable magnification lens group G2, the compensation lens group G3 and the light splitting prism L15 are sequentially arranged along the optical axis direction from the object plane to the image plane. The target emission spectrum sequentially passes through the first fixed lens group G1, the variable magnification lens group G2 and the compensation lens group G3, and is then split by the light splitting prism L15. The light splitting prism L15 splits the light beam into two paths, i.e., an ultraviolet light beam and a visible light beam. The ultraviolet light beam is received and imaged by the ultraviolet adaptive CCD image sensor after passing through the second fixed lens group G4, and the visible light beam is received and imaged by the visible adaptive CCD image sensor after passing through the third fixed lens group G5. The working wavelength range of the zoom system is 310 nm to 656 nm. The incident light is split into two paths by the light splitting prism L15 and guided to the lens groups adapted to ultraviolet light and visible light, thereby realizing the synchronous collection and imaging of the light beams of two wavelength ranges in the same field of view, and the spatial position of the alpha particle can be located more quickly and accurately.

[0033] In the zoom system, the first fixed lens group G1, the second fixed lens group G4 and the third fixed lens group G5 are fixedly arranged, so that the first fixed lens group G1, the second fixed lens group G4 and the third fixed lens group G5 are not moved relative to the image plane. The variable magnification lens group G2 and the compensation lens group G3 are arranged to move along the optical axis direction to realize zooming. When the variable magnification lens group G2 and the compensation lens group G3 move along the optical axis direction, the variable magnification lens group G2 functions as a zoom lens, and the compensation lens group G3 functions as a focusing lens. The positions of the variable magnification lens group G2 and the compensation lens group G3 on the optical axis can switch the zoom system between the wide-angle end and the telephoto end. In the process of realizing zooming by changing the positions of the variable magnification lens group G2 and the compensation lens group G3 on the optical axis, the zoom system is at the wide-angle end when the focal length is the shortest, i.e., the field of view is the largest, and the zoom system is at the telephoto end when the focal length is the longest. At the wide-angle end and the telephoto end, the zoom system has different focal lengths and optical powers. When the zoom system is at the short-focus end (wide-angle end), the variable magnification lens group G2 is at the left end of its moving range, and the compensation lens group G3 is at the right end of its moving range. When the variable magnification lens group G2 moves toward the image plane along the optical axis, and the compensation lens group G3 moves toward the object plane along the optical axis, the focal length of the zoom system increases.

[0034] At the short-focus position, the ratios of the focal lengths of the lens groups to the focal length of the system satisfy the following relationships: the ratio of the focal length of the first fixed lens group G1 to the focal length of the entire zoom system is 7.56, the ratio of the focal length of the variable magnification lens group G2 to the focal length of the entire zoom system is -2.44, the ratio of the focal length of the compensation lens group G3 to the focal length of the entire zoom system is 2.27, the ratio of the focal length of the second fixed lens group G4 to the focal length of the entire zoom system is 1.56, and the ratio of the focal length of the third fixed lens group G5 to the focal length of the entire zoom system is 1.62. The above relationships are expressed by the following formulas:

[0035] ;

[0036] wherein, 、 、 、 、 f1, f2, f3, f4, f5 are focal lengths of the first fixed lens group G1, the variable magnification lens group G2, the compensation lens group G3, the second fixed lens group G4, the third fixed lens group G5, respectively, f is the focal length of the UV and visible light co-aperture zoom system.

[0037] At the mid focal length position, the ratio of the focal length of the first fixed lens group G1 to the total focal length of the zoom system is 3.02, the ratio of the focal length of the variable magnification lens group G2 to the total focal length of the zoom system is -0.97, the ratio of the focal length of the compensation lens group G3 to the total focal length of the zoom system is 0.91, the ratio of the focal length of the second fixed lens group G4 to the total focal length of the zoom system is 0.62, and the ratio of the focal length of the third fixed lens group G5 to the total focal length of the zoom system is 0.65. The above relationships are expressed by the following formulas:

[0038] .

[0039] At the long focal length position, the ratio of the focal length of the first fixed lens group G1 to the total focal length of the zoom system is 1.89, the ratio of the focal length of the variable magnification lens group G2 to the total focal length of the zoom system is -0.61, the ratio of the focal length of the compensation lens group G3 to the total focal length of the zoom system is 0.57, the ratio of the focal length of the second fixed lens group G4 to the total focal length of the zoom system is 0.39, and the ratio of the focal length of the third fixed lens group G5 to the total focal length of the zoom system is 0.40. The above relationships are expressed by the following formulas:

[0040] .

[0041] By controlling the ratios of the focal lengths of the first fixed lens group G1, the variable magnification lens group G2, the compensation lens group G3, the second fixed lens group G4, and the third fixed lens group G5 to the total focal length of the zoom system within the ranges as described above, the image plane position is kept stable and the zooming is smoother when the zoom system continuously zooms within the focal length range of 50mm to 200mm.

[0042] As a specific embodiment, the first fixed lens group G1 includes first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 arranged in order from the object side to the image side. The first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, and the sixth lens L6 has positive refractive power. The working wavelength range of the first fixed lens group G1 is 310nm-656nm. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all spherical glass, and the glass grades are F_SILICA, CAF2, F_SILICA, CAF2, F_SILICA, and CAF2, respectively. The parameters of the first fixed lens group G1 are shown in Table 1.

[0043] Table 1 Detailed parameters of the first fixed lens group G1

[0044]

[0045] As a specific embodiment, the variable magnification lens group G2 includes seventh lens L7, eighth lens L8, ninth lens L9, and tenth lens L10 arranged in order from the object side to the image side. The seventh lens L7 has positive refractive power, the eighth lens L8 has negative refractive power, the ninth lens L9 has positive refractive power, and the tenth lens L10 has negative refractive power. The working wavelength range of the variable magnification lens group G2 is 310nm-656nm. The seventh lens L7, the eighth lens L8, the ninth lens L9, and the tenth lens L10 are all spherical glass, and the glass grades are F_SILICA, CAF2, F_SILICA, and CAF2, respectively. The parameters of the variable magnification lens group G2 are shown in Table 2.

[0046] Table 2 Detailed parameters of the variable magnification lens group G2

[0047]

[0048] As a specific embodiment, the compensation lens group G3 includes eleventh lens L11, twelfth lens L12, thirteenth lens L13, and fourteenth lens L14 arranged in order from the object side to the image side. The eleventh lens L11 has positive refractive power, the twelfth lens L12 has negative refractive power, the thirteenth lens L13 has positive refractive power, and the fourteenth lens L14 has negative refractive power. The working wavelength range of the compensation lens group G3 is 310nm-656nm. The eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, and the fourteenth lens L14 are all spherical glass, and the glass grades are CAF2, F_SILICA, CAF2, and F_SILICA, respectively. The parameters of the compensation lens group G3 are shown in Table 3.

[0049] Table 3 Compensating lens group G3 detailed parameters

[0050]

[0051] As a specific embodiment, the second fixed lens group G4 includes, arranged in order from the object plane to the image plane, a first stop L16, a fifteenth lens L17, a sixteenth lens L18, a seventeenth lens L19, an eighteenth lens L20, a nineteenth lens L21, and a twentieth lens L22. The fifteenth lens L17 has a negative refractive power, the sixteenth lens L18 has a positive refractive power, the seventeenth lens L19 has a negative refractive power, the eighteenth lens L20 has a positive refractive power, the nineteenth lens L21 has a negative refractive power, and the twentieth lens L22 has a positive refractive power. The operating wavelength range of the second fixed lens group G4 is 310 nm to 370 nm. The fifteenth lens L17, the sixteenth lens L18, the seventeenth lens L19, the eighteenth lens L20, the nineteenth lens L21, and the twentieth lens L22 are all spherical glass, and the glass grades are F SILICA, CAF2, F SILICA, CAF2, F SILICA, and CAF2, respectively. The back working distance of the second fixed lens group G4 is 19 mm. The parameters of the second fixed lens group G4 are shown in Table 4.

[0052] Table 4 Second fixed lens group G4 detailed parameters

[0053]

[0054] As a specific embodiment, the third fixed lens group G5 includes, arranged in order from the object plane to the image plane, a second diaphragm L23, a twenty-first lens L24, a twenty-second lens L25, a twenty-third lens L26, a twenty-fourth lens L27, a twenty-fifth lens L28, a twenty-sixth lens L29, and a twenty-seventh lens L30. The twenty-first lens L24 has positive refractive power, the twenty-second lens L25 has positive refractive power, the twenty-third lens L26 has negative refractive power, the twenty-fourth lens L27 has positive refractive power, the twenty-fifth lens L28 has negative refractive power, the twenty-sixth lens L29 has negative refractive power, and the twenty-seventh lens L30 has positive refractive power. The working wavelength range of the third fixed lens group G5 is 486nm-656nm. The twenty-first lens L24, the twenty-second lens L25, the twenty-third lens L26, the twenty-fourth lens L27, the twenty-fifth lens L28, the twenty-sixth lens L29, and the twenty-seventh lens L30 are all spherical glass, and the glass grades are H-ZLAF53B, H-LAF4, H-QK3L, H-ZPK7, H-ZLAF90, H-LAK51A, and H-ZLAF4LA, respectively. The back working distance of the third fixed lens group G5 is 19mm. The parameters of the third fixed lens group G5 are shown in Table 5.

[0055] Table 5: Detailed parameters of the third fixed lens group G5

[0056]

[0057] The overall performance indicators of the ultraviolet and visible light co-aperture zoom system for visual detection of alpha particles provided by the application are as follows:

[0058] Working wavelength range: 310nm-656nm;

[0059] Focal length: 50mm (W)-200mm (T);

[0060] Field of view: 8.07° (W)-1.975° (T);

[0061] Maximum clear aperture: 106.611mm;

[0062] Image plane size: 7.24mm.

[0063] Wherein, W represents short focus, and T represents long focus.

[0064] Figures 2 to 7The modulation transfer function of the zoom system provided by the present invention at short focal length, medium focal length, and long focal length in the ultraviolet and visible light bands is shown. As can be seen from the figure, at the limit of the inherent maximum spatial frequency of the ultraviolet image sensor, 50 lp / mm, the modulation transfer function value of the zoom system of the present invention is greater than 0.6, and the imaging quality is good, ensuring that the ultraviolet image sensor can still acquire high-contrast images at its spatial frequency response limit.

[0065] Figures 8 to 13 The figure shows the distortion of the zoom system provided by the present invention at short focal length, medium focal length, and long focal length in the ultraviolet and visible light bands, respectively. As can be seen from the figure, the absolute value of the distortion of the zoom system of the present invention is no greater than 2.7% within the effective field of view, and the absolute value of the distortion in the central region of the effective field of view is no greater than 1%. The distortion is small, ensuring that the geometric distortion of the output image of the zoom system meets the accuracy requirements of alpha particle visualization detection.

[0066] The zoom system provided by this invention employs a highly optimized structural design. Through precise control of the lens group arrangement, lens surface parameters, and the existing zoom cam mechanism, the movement trajectories of the zoom lens group G2 and the compensation lens group G3 are controlled, achieving a smooth and fluid zoom process. Driven by the zoom cam mechanism, the movement curves of the zoom lens group G2 and the compensation lens group G3 are smooth (e.g., ...). Figure 14 As shown in the figure, the horizontal axis represents the relative position of the lens groups between the zoom lens group G2 and the compensation lens group G3, and the vertical axis represents the amount of movement of the zoom lens group G2. The system has good stability and is suitable for integration into remote detection equipment or robot platforms. It is very suitable for application in complex nuclear industrial environments or other related safety monitoring fields that are difficult for personnel to reach.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An ultraviolet and visible light co-aperture zoom system for alpha particle visualization detection, characterized in that, The first fixed lens group (G1), the variable magnification lens group (G2), the compensation lens group (G3), the light splitting prism (L15), the second fixed lens group (G4) and the third fixed lens group (G5) are arranged in sequence along the optical axis direction from the object plane to the image plane, the light splitting prism (L15) splits the light beam into an ultraviolet light beam and a visible light beam, the ultraviolet light beam is received by an ultraviolet adaptive CCD image sensor after passing through the second fixed lens group (G4), and the visible light beam is received by a visible adaptive CCD image sensor after passing through the third fixed lens group (G5). The first fixed lens group (G1), the second fixed lens group (G4) and the third fixed lens group (G5) are fixedly arranged, the variable magnification lens group (G2) and the compensation lens group (G3) move along the optical axis direction to realize zooming, and the focal length of the system is the shortest and the field of view angle is the largest when the variable magnification lens group (G2) is at the leftmost end of its moving range and the compensation lens group (G3) is at the rightmost end of its moving range, and the focal length ranges from 50mm to 200mm. The first fixed lens group (G1) includes first lens (L1), second lens (L2), third lens (L3), fourth lens (L4), fifth lens (L5) and sixth lens (L6) arranged in sequence from the object plane to the image plane; the second lens (L2), the fourth lens (L4) and the sixth lens (L6) all have positive focal length, the first lens (L1), the third lens (L3) and the fifth lens (L5) all have negative focal length; the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4), the fifth lens (L5) and the sixth lens (L6) are all spherical glass, and the glass grades are F_SILICA, CAF2, F_SILICA, CAF2, F_SILICA and CAF2 respectively; the working waveband of the first fixed lens group (G1) is 310nm-656nm.

2. The alpha particle visualizing detection ultraviolet and visible light co- aperture zoom system of claim 1, wherein, ​ 3. The alpha particle visualizing detection ultraviolet and visible light co- aperture zoom system of claim 1, wherein, The variable magnification lens group (G2) comprises a seventh lens (L7), an eighth lens (L8), a ninth lens (L9) and a tenth lens (L10) arranged in order from an object plane to an image plane; the seventh lens (L7) and the ninth lens (L9) have positive refractive powers, the eighth lens (L8) and the tenth lens (L10) have negative refractive powers; the seventh lens (L7), the eighth lens (L8), the ninth lens (L9) and the tenth lens (L10) are all spherical glass, and the glass grades are F_SILICA, CAF2, F_SILICA and CAF2 respectively; the working wavelength range of the variable magnification lens group (G2) is 310nm-656nm.

4. The alpha particle visualizing detection ultraviolet and visible co- aperture zoom system of claim 1, wherein, The compensation lens group (G3) comprises an eleventh lens (L11), a twelfth lens (L12), a thirteenth lens (L13) and a fourteenth lens (L14) arranged in order from an object plane to an image plane; the eleventh lens (L11) and the thirteenth lens (L13) have positive refractive powers, the twelfth lens (L12) and the fourteenth lens (L14) have negative refractive powers; the eleventh lens (L11), the twelfth lens (L12), the thirteenth lens (L13) and the fourteenth lens (L14) are all spherical glass, and the glass grades are CAF2, F_SILICA, CAF2 and F_SILICA respectively; the working wavelength range of the compensation lens group (G3) is 310nm-656nm.

5. The alpha particle visualizing detection ultraviolet and visible light co- aperture zoom system of claim 1, wherein, The second fixed lens group (G4) comprises a first diaphragm (L16), a fifteenth lens (L17), a sixteenth lens (L18), a seventeenth lens (L19), an eighteenth lens (L20), a nineteenth lens (L21) and a twentieth lens (L22) arranged in order from an object plane to an image plane; the sixteenth lens (L18), the eighteenth lens (L20) and the twentieth lens (L22) all have positive refractive powers; the fifteenth lens (L17), the seventeenth lens (L19) and the nineteenth lens (L21) all have negative refractive powers; the fifteenth lens (L17), the sixteenth lens (L18), the seventeenth lens (L19), the eighteenth lens (L20), the nineteenth lens (L21) and the twentieth lens (L22) are all spherical glass, and the glass grades are F_SILICA, CAF2, F_SILICA, CAF2, F_SILICA and CAF2 respectively; the back working distance of the second fixed lens group (G4) is 19mm, and the working wavelength range is 310nm-370nm.

6. The alpha particle visualizing detection ultraviolet and visible co- aperture zoom system of claim 1, wherein, The third fixed lens group (G5) comprises, arranged in order from an object plane to an image plane, a second diaphragm (L23), a 21st lens (L24), a 22nd lens (L25), a 23rd lens (L26), a 24th lens (L27), a 25th lens (L28), a 26th lens (L29), and a 27th lens (L30); the 21st lens (L24), the 22nd lens (L25), the 24th lens (L27), and the 27th lens (L30) all have positive refractive powers, and the 23rd lens (L26), the 25th lens (L28), and the 26th lens (L29) all have negative refractive powers; the 21st lens (L24), the 22nd lens (L25), the 23rd lens (L26), the 24th lens (L27), the 25th lens (L28), the 26th lens (L29), and the 27th lens (L30) are all spherical glass, and the glass grades are H-ZLAF53B, H-LAF4, H-QK3L, H-ZPK7, H-ZLAF90, H-LAK51A, and H-ZLAF4LA, respectively; the back working distance of the third fixed lens group (G5) is 19 mm, and the working wave band is 486 nm-656 nm.

7. The alpha particle visualizing detection ultraviolet and visible co- aperture zoom system of claim 1, wherein, In the short-focus position, the ratios of the focal lengths of the lens groups to the system focal length satisfy the following relationships: ； wherein , , , , are focal lengths of the first fixed lens group (G1), the variable magnification lens group (G2), the compensation lens group (G3), the second fixed lens group (G4), the third fixed lens group (G5), respectively, is a focal length of the ultraviolet and visible light common-aperture zoom system.

8. The alpha particle visualizing detection ultraviolet and visible co- aperture zoom system of claim 1, wherein, In the medium-focus position, the ratios of the focal lengths of the lens groups to the system focal length satisfy the following relationships: ； wherein , , , , are focal lengths of the first fixed lens group (G1), the variable magnification lens group (G2), the compensation lens group (G3), the second fixed lens group (G4), the third fixed lens group (G5), respectively, is a focal length of the ultraviolet and visible light common-aperture zoom system.

9. The alpha particle visualizing detection ultraviolet and visible co- aperture zoom system of claim 1, wherein, In the long-focus position, the ratios of the focal lengths of the lens groups to the system focal length satisfy the following relationships: ； wherein , , , , are focal lengths of the first fixed lens group (G1), the variable magnification lens group (G2), the compensation lens group (G3), the second fixed lens group (G4), the third fixed lens group (G5), respectively, is a focal length of the ultraviolet and visible light common-aperture zoom system.

10. The alpha particle visualizing detection ultraviolet and visible co- aperture zoom system of claim 1, wherein, The first fixed lens group (G1), the variable lens group (G2), the compensation lens group (G3), the light-splitting prism (L15), the second fixed lens group (G4), and the third fixed lens group (G5) are arranged in the same lens barrel.

Images