Secondary light splitting structure gas infrared imaging detector

Abstract

The application discloses a two-stage light splitting structure gas infrared imaging detector and relates to the technical field of optical imaging gas detection. The device comprises a lens assembly and a body assembly. The body assembly comprises a camera shell. The camera shell is provided with a groove matched with the lens assembly. The lens assembly is fixedly installed at the groove on the camera shell. A two-stage light splitting and light filtering structure and a detector are fixedly installed in the groove on the camera shell. The two-stage light splitting and light filtering structure can divide the light entering the lens assembly into several groups of light rays passing through different light filtering conditions, and then the light rays are captured by the detector. Compared with the rotatable switching mechanism in the prior art, the device can detect various types of gases without manual rotation adjustment, is beneficial to real-time detection, and improves the automation degree of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging gas detection, in particular to a two-stage light splitting structure gas infrared imaging detector. BACKGROUND

[0002] Before in our country because of industrial dangerous gas leakage caused by safety accidents, city gas pipeline leakage caused by explosion occurred. The traditional point type gas detection equipment is mostly needed to contact the detected gas, the coverage is small, the detection type is less, many target places to be detected cannot be reached, it is difficult to meet the actual needs of industrial maintenance and inspection, city safety guarantee. The infrared imaging technology can play its own advantages of high efficiency, large scene and long distance detection to fill this application gap. But the existing equipment is large in size, and still needs to be connected with algorithm running module, display device, external power supply, etc., resulting in low integration and inconvenience to move.

[0003] In the field of application, it is mostly a single gas imaging device, that is, it can only detect a specified gas. The Chinese patent document with publication number CN217901123U discloses a non-cryogenic infrared imaging gas leak detection device, which realizes the leak detection of multiple different types of gases by setting a switching mechanism and multiple filters. In use, it is limited to manual adjustment of the switching mechanism to distinguish the gas type one by one, which is difficult to ensure the automation and real-time performance of the system. SUMMARY

[0004] The technical problem to be solved by the present application is that the existing infrared imaging gas detection technology needs to manually adjust the filter wheel to distinguish the gas type one by one when facing the detection of multiple gas types, which is complicated and time-consuming.

[0005] To solve the above technical problems, the present application provides a two-stage light splitting structure gas infrared imaging detector, which comprises a lens assembly and a body assembly. The body assembly comprises a camera shell, and the camera shell is provided with a groove matched with the lens assembly. The lens assembly is fixedly installed at the groove on the camera shell. A two-stage light splitting and filtering structure and a detector are fixedly installed in the groove on the camera shell. The two-stage light splitting and filtering structure can divide the light entering the lens assembly into several groups of light that passes through different filtering conditions, and then be captured by the detector.

[0006] Further, the two-stage light splitting and filtering structure comprises a first-stage light splitting layer, a first-stage filtering layer, a second-stage light splitting layer and a second-stage filtering layer installed in the groove in sequence.

[0007] Further, the first-stage light splitting layer is composed of one large light splitting prism; and the second-stage light splitting layer is composed of two small light splitting prisms arranged side by side.

[0008] Further, the first filter layer comprises a first mounting sheet, and two different waveband filters are arranged on the first mounting sheet; the second filter layer comprises a second mounting sheet, and four different waveband filters are arranged on the second mounting sheet.

[0009] Further, the filters arranged on the first mounting sheet are respectively an 8000-9450nm short-pass filter and an 8000-10600nm short-pass filter; the filters arranged on the second mounting sheet are respectively a 9000-14000nm long-pass filter, a 9430-14000nm long-pass filter, a 10400-14000nm long-pass filter and a 10545-14000nm long-pass filter.

[0010] Further, the body assembly further comprises a display screen, a camera handle, a focal length adjusting button and an eye lens, the display screen is movably connected to the camera shell through a rotating shaft, and the display screen is electrically connected to the detector; the camera handle is fixedly installed on the side of the camera shell away from the display screen; the focal length adjusting button is installed on the camera shell and is electrically connected to the lens assembly; the eye lens is movably connected to the camera shell, and the eye lens is electrically connected to the detector.

[0011] Further, the detector is a non-cooled wide waveband infrared detector.

[0012] Compared with the prior art, the beneficial effects of the present application are:

[0013] 1. The two-stage light splitting structure gas infrared imaging detector provided by the present application has high integration, is convenient to move and is suitable for use in multiple scenes.

[0014] 2. The two-stage light splitting and filtering structure is a fixed structure, and compared with a rotatable switching mechanism, the structure can perform detection on multiple different types of gases without manual rotation adjustment, is conducive to realizing real-time detection and improving the automation degree of the system. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present application;

[0016] Figure 2 is an exploded view of the present application;

[0017] Figure 3 is a schematic diagram of the lens assembly of the present application;

[0018] Figure 4 is a schematic diagram of the two-stage light splitting and filtering structure of the present application;

[0019] The meaning of the reference signs in the figure is as follows: 1, lens barrel; 2, optical lens; 3, aperture; 4, first-order light splitting layer; 5, first-order filter layer; 6, second-order light splitting layer; 7, second-order filter layer; 8, detector; 9, camera housing; 10, camera handle; 11, focal length adjustment button; 12, viewfinder; 13, 8000-9450nm short-pass filter; 14, 8000-10600nm short-pass filter; 15, 9000-14000nm long-pass filter; 16, 9430-14000nm long-pass filter; 17, 10400-14000nm long-pass filter; 18, 10545-14000nm long-pass filter; 19, display screen. DETAILED DESCRIPTION

[0020] In order to better explain the present application, so as to be understood, the technical solutions and effects of the present application are described in detail in the specific embodiments below, combined with the drawings.

[0021] As shown in the figure, a two-stage light splitting structure gas infrared imaging detector includes a lens assembly and a body assembly. Figure 1

[0022] As shown in the figure, the body assembly includes a camera housing 9, a two-stage light splitting and filtering structure, a detector 8, a display screen 19, a camera handle 10, a focal length adjustment button 11, and a viewfinder 12. The camera housing 9 is provided with a groove matched with the lens assembly, and the lens assembly is fixedly installed in the groove on the camera housing. The two-stage light splitting and filtering structure and the detector 8 are fixedly installed in the groove on the camera housing. One side of the camera housing is provided with a protruding part, and the protruding part is provided with a jack. The display screen 19 is rotatably connected to the jack of the protruding part through a shaft, and the display screen 19 is electrically connected to the detector 8. The camera handle is fixedly installed on the side of the camera housing away from the display screen. The camera housing is provided with a mounting groove, and the inner wall of the mounting groove is provided with a jack. The display screen 19 is rotatably connected to the jack on the inner wall of the mounting groove through a shaft, and the viewfinder 12 is electrically connected to the detector 8. The focal length adjustment button is installed on the camera housing and is electrically connected to the lens assembly. Figure 2

[0023] As shown in the figure, the lens assembly includes a lens barrel 1, and the optical lens 2 and the aperture 3 are fixedly installed in the lens barrel 1 in sequence. Figure 3

[0024] As shown in the figure, the lens assembly includes a lens barrel 1, and the optical lens 2 and the aperture 3 are fixedly installed in the lens barrel 1 in sequence. Figure 4 ​​​The secondary light splitting and filtering structure includes a first light splitting layer 4, a first filtering layer 5, a second light splitting layer 6 and a second filtering layer 7 installed in the groove in sequence. The first light splitting layer 4 is composed of a large light splitting prism; the second light splitting layer is composed of two small light splitting prisms distributed in parallel; the first filtering layer includes a first mounting sheet, and the first mounting sheet is fixedly installed with an 8000-9450nm short-pass filter 13 and an 8000-10600nm short-pass filter 14 respectively; the second filtering layer includes a second mounting sheet, and the second mounting sheet is fixedly installed with a 9000-14000nm long-pass filter, a 9430-14000nm long-pass filter, a 10400-14000nm long-pass filter and a 10545-14000nm long-pass filter respectively. The distance between the large light splitting prism and the first filtering layer is determined according to the light splitting characteristics of the large light splitting prism and the relative positions of the two filters in the first filtering layer 5; the distance between the large light splitting prism and the first filtering layer is determined according to the light splitting characteristics of the two small light splitting prisms and the relative positions of the two filters in the first filtering layer 5, so as to reduce the loss of light in the light splitting and filtering process. The large and small light splitting prisms are fixed by the corresponding square holes in the groove, and the first mounting sheet and the second mounting sheet are fixed by the corresponding circular holes in the groove.

[0025] In use, light rays are captured by the lens assembly, then pass through the large light splitting prism and are divided into two beams. The first beam of light passes through the 8000-9450nm short-pass filter 13 on the first filter layer 5, then passes through the small light splitting prism and is divided into two beams, which pass through the 9000-14000nm long-pass filter 15 and the 9430-14000nm long-pass filter 16 respectively. After the two beams of light are captured by the detector, two images are presented on the display screen. The light that can pass through the 8000-9450nm short-pass filter 13 and the 9000-14000nm long-pass filter 15 but cannot pass through the 9430-14000nm long-pass filter 16 is imaged by the detector as image 1, and the light that can pass through the 8000-9450nm short-pass filter 13, the 9000-14000nm long-pass filter 15 and the 9430-14000nm long-pass filter 16 is imaged by the detector as image 2. Through spectral band comparison, the gas that exists in image 1 but does not exist in image 2 is C2H5OH, and the gas that exists in both image 1 and image 2 is CH3OH. The second beam of light passes through the 8000-10600nm short-pass filter 14 on the first filter layer 5, then passes through the small light splitting prism and is divided into two beams, which pass through the 10400-14000nm long-pass filter 17 and the 10545-14000nm long-pass filter 18 respectively. After the two beams of light are captured by the detector, two images are presented on the display screen. The light that can pass through the 8000-10600nm short-pass filter 14 and the 10400-14000nm long-pass filter 17 but cannot pass through the 10545-14000nm long-pass filter 18 is imaged by the detector as image 3, and the light that can pass through the 8000-10600nm short-pass filter 14, the 10400-14000nm long-pass filter 17 and the 10545-14000nm long-pass filter 18 is imaged by the detector as image 4. Through spectral band comparison, the gas that exists in image 3 but does not exist in image 4 is C2H4, and the gas that exists in both image 3 and image 4 is SF6.

[0026] Further, the detector 8 is a non-cooled wide-band infrared detector, so that the volume of the device is further reduced and the integration level of the device is improved.

[0027] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope defined by the claims of the present application.

Claims

1. A secondary light splitting structure gas infrared imaging detector, comprising a lens assembly and a body assembly, the body assembly comprising a camera housing (9), the camera housing (9) being provided with a groove matched with the lens assembly, and the lens assembly being fixedly installed at the groove on the camera housing (9), characterized in that, The groove on the camera shell (9) is fixedly installed with a two-stage light splitting and filtering structure and a detector (8), the two-stage light splitting and filtering structure can make the light entering the lens assembly into several groups of light rays passing through different filtering conditions, and then captured by the detector (8); The two-stage light splitting and filtering structure comprises a first-stage light splitting layer (4), a first-stage filtering layer (5), a second-stage light splitting layer (6) and a second-stage filtering layer (7) installed in the groove in sequence; The first-stage light splitting layer (4) is composed of one large light splitting prism; the second-stage light splitting layer (6) is composed of two small light splitting prisms arranged side by side; The first-stage filtering layer (5) comprises a first mounting sheet, and two filter sheets of different wave bands are arranged on the first mounting sheet; the second-stage filtering layer (7) comprises a second mounting sheet, and four filter sheets of different wave bands are arranged on the second mounting sheet.

2. The secondary optical gas imaging detector according to claim 1, wherein, The filter sheets arranged on the first mounting sheet are respectively an 8000-9450nm short-pass filter sheet (13) and an 8000-10600nm short-pass filter sheet (14); the filter sheets arranged on the second mounting sheet are respectively a 9000-14000nm long-pass filter sheet (15), a 9430-14000nm long-pass filter sheet (16), a 10400-14000nm long-pass filter sheet (17) and a 10545-14000nm long-pass filter sheet (18).

3. The secondary optical gas imaging detector according to claim 1, wherein, The lens assembly comprises a lens barrel (1), and the lens barrel (1) is fixedly installed with an optical lens (2) and an aperture (3) in sequence.

4. The secondary optical gas imaging detector according to claim 1, wherein, The body assembly further comprises a display screen (19), a camera handle (10), a focal length adjusting button (11) and a viewfinder (12), the display screen (19) is movably connected to the camera shell (9) through a rotating shaft, and the display screen (19) is electrically connected to the detector (8); the camera handle (10) is fixedly installed on the side of the camera shell (9) away from the display screen; the focal length adjusting button (11) is installed on the camera shell (9) and electrically connected to the lens assembly; the viewfinder (12) is movably connected to the camera shell (9), and the viewfinder (12) is electrically connected to the detector (8).

5. The secondary optical gas imaging detector according to claim 1, wherein, The detector (8) is a non-cooled wide-band infrared detector.

Images