Long-wave uncooled boiler temperature measuring lens

Abstract

The utility model relates to the technical field of optics, in particular to a long-wave uncooled boiler temperature measuring lens, which comprises a first lens, a second lens, a secondary imaging lens, an aperture diaphragm and an uncooled detector. According to the boiler temperature measuring lens of the long-wave uncooled detector camera, the boiler temperature measuring lens is composed of the aperture diaphragm, the first lens, the second lens, the secondary imaging lens and the uncooled detector, the working wave band of the boiler temperature measuring lens is 8-12 micrometers, the focal length of the boiler temperature measuring lens is 5 mm, the aperture of the boiler temperature measuring lens is F1.5, the adaptive resolution of the boiler temperature measuring lens is 384 * 288, the pixel size of the boiler temperature measuring lens is 17 micrometers, the total length of an optical system is 150 mm, and the maximum aperture of the boiler temperature measuring lens is 27 mm. The lens has the advantages of being good in imaging quality, small in lens aperture, reasonable in tolerance, easy to install and adjust, easy to produce in mass, capable of meeting the imaging quality, long in length, small in aperture and large in view field, capable of improving the imaging quality, suitable for special application scenes, capable of optimizing optical performance and capable of improving the system integration degree, and the structural length meets the use requirement.

Description

Technical Field

[0001] This utility model relates to the field of optical technology, and in particular to a long-wavelength uncooled boiler temperature measuring lens. Background Technology

[0002] In the field of blast furnace smelting, operators need to accurately measure the temperature at various locations inside the furnace. However, they face technical challenges such as thick furnace walls, large furnace space, and high temperatures, making it difficult to achieve accurate temperature measurement. With the maturity of infrared thermal imaging detector technology, infrared temperature measurement technology can be widely used in the field of furnace temperature measurement. Therefore, there is an urgent need for an optical system with a large field of view, long length, and small aperture to be inserted into the blast furnace for observation, and a gas cooling device should be fitted around the lens.

[0003] Existing temperature measurement lenses for uncooled boilers typically have a large field of view. A large field of view means a short focal length, but this requires a very long overall optical system and a very small lens aperture, which are contradictory from a traditional perspective.

[0004] Therefore, in response to the problem that existing uncooled boiler temperature measuring lenses typically have a large field of view and short focal length, which contradicts the traditional angle, a boiler temperature measuring lens for long-wavelength uncooled detector cameras can be designed. While meeting the imaging quality requirements, it also features a long length, small aperture, and large field of view, which can improve imaging quality, adapt to special application scenarios, optimize optical performance, and improve system integration. Utility Model Content

[0005] To overcome the problem that existing non-refrigerated boiler temperature measuring lenses typically have a large field of view and a short focal length, which contradicts the traditional angle.

[0006] The technical solution of this utility model is as follows: a long-wave uncooled boiler temperature measuring lens, including a first lens, a second lens, a secondary imaging lens, an aperture stop and an uncooled detector. The aperture stop, the first lens, the second lens, the secondary imaging lens and the uncooled detector are arranged sequentially from the object side to the image side along the optical axis. The uncooled detector includes a protective window and an imaging focal plane. The protective window is located at the front of the uncooled detector and the imaging focal plane is located behind the protective window.

[0007] Preferably, the first lens is a meniscus germanium positive lens with its concave surface facing the object side, and it has an aspherical surface.

[0008] Preferably, the second lens is a meniscus germanium positive lens with its concave surface facing the object side, and it has an aspherical surface.

[0009] Preferably, the secondary imaging lens is a meniscus germanium positive lens with its convex surface facing the object side and an aspherical surface on it.

[0010] The beneficial effects of this utility model are:

[0011] 1. A boiler temperature measuring lens for a long-wavelength uncooled detector camera, consisting of an aperture stop, a first lens, a second lens, a secondary imaging lens, and an uncooled detector, is designed to fit a long-wavelength uncooled detector with a resolution of 384x288 and a pixel size of 17 micrometers. The optical system has a total length of 150mm, a maximum aperture of 27mm, good imaging quality, and a structural length that meets usage requirements. The lens has a small aperture, reasonable tolerances, simple assembly and adjustment, and is easy to mass-produce. While meeting imaging quality requirements, it also features a long length, small aperture, and large field of view, which can improve imaging quality, adapt to special application scenarios, optimize optical performance, and improve system integration. Attached Figure Description

[0012] Figure 1 The diagram shown is of the optical system of the long-wave uncooled boiler temperature measuring lens of this utility model.

[0013] Figure 2 The diagram shown is a point array of the long-wave uncooled boiler temperature measuring lens of this utility model.

[0014] Figure 3 The diagram shown is the mechanical transfer function of the long-wave uncooled boiler temperature measuring lens of this utility model.

[0015] Figure 4 The image shown is an astigmatic distortion diagram of the long-wave uncooled boiler temperature measuring lens of this utility model.

[0016] Explanation of reference numerals in the attached figures: 110, aperture stop; 120, first lens; 130, second lens; 140, secondary imaging lens; 150, uncooled detector; 152, protective window; 154, imaging focal plane; S1-S6, various surfaces of the lens. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Please see Figure 1This utility model provides an embodiment: a long-wavelength uncooled boiler temperature measuring lens, including a first lens 120, a second lens 130, a secondary imaging lens 140, an aperture stop 110, and an uncooled detector 150. The aperture stop 110, the first lens 120, the second lens 130, the secondary imaging lens 140, and the uncooled detector 150 are arranged sequentially along the optical axis from the object side to the image side. The uncooled detector 150 includes a protective window 152 and an imaging focal plane 154. The protective window 152 is located at the front of the uncooled detector 150, and the imaging focal plane 154 is located at the front of the protective window 152. Behind the protective window 152, the material of the protective window 152 is silicon single crystal. The resolution of the imaging focal plane 154 is 384x288 and the pixel size is 17μmx17μm. The first lens 120 is a meniscus germanium positive lens with its concave surface facing the object side and an aspherical surface on it. The second lens 130 is a meniscus germanium positive lens with its concave surface facing the object side and an aspherical surface on it. The secondary imaging lens 140 is a meniscus germanium positive lens with its convex surface facing the object side and an aspherical surface on it. The surfaces of the first lens 120, the second lens 130 and the secondary imaging lens 140 are all coated with anti-reflection coatings.

[0019] Please see Figures 2-4 In this embodiment, the following parameters are satisfied: EFL = 5mm, F-number = 1.5, total length of the optical system (including the cooled detector) = 150mm, adapter detector 384x288, pixel size 17μm, full field of view of the lens is: 2ω = 95°, and the aspherical surfaces in the lens satisfy the following expression:

[0020]

[0021] Where z is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis, c represents the vertex curvature of the surface, k is the conic coefficient, and α2, α3, α4, α5, and α6 are higher-order aspherical coefficients.

[0022] During operation, light first shines on the aperture stop 110, and then disperses through the aperture stop 110 to the first lens 120;

[0023] Then, under the action of the first lens 120, light shines onto the second lens 130, forming a preliminary image;

[0024] Finally, the light reaches the secondary imaging lens 140 under the action of the second lens 130, and is imaged again under the action of the secondary imaging lens 140, and finally reaches the uncooled detector 150, and is observed through the imaging focal plane 154.

[0025] During the imaging process, the internal imaging focal plane 154 is protected from interference and damage from the external environment by the protective window 152.

[0026] Table 1 shows the optical structure parameters of the present invention:

[0027] Table 1

[0028]

[0029] The aspherical surfaces mentioned in the three lenses above are all even-order aspherical surfaces, and their expressions are as follows:

[0030] Where z is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis, c represents the vertex curvature of the surface, k is the conic coefficient, and α2, α3, α4, α5, and α6 are higher-order aspherical coefficients.

[0031] Table 2 shows the aspheric coefficients of surfaces S1, S3, and S6:

[0032] Table 2

[0033] surface <![CDATA[α4]]> <![CDATA[α6]]> <![CDATA[α8]]> <![CDATA[α 10 ]]> <![CDATA[α 12 ]]> S1 -0.00019997018 1.6258084e-005 -1.0894525e-006 3.4623956e-008 -4.3859937e-010 S3 1.3666364e-005 -2.8891382e-007 5.2831769e-011 7.4852139e-012 -4.7673552e-015 S6 2.5206231e-006 -1.3403741e-008 1.29067e-010 -6.1752085e-013 1.1060054e-015

[0034] The effects of the present invention will be described in further detail below with reference to the aberration analysis diagram.

[0035] Figures 2-4 yes Figure 1 Aberration analysis diagram of a specific embodiment of the mid-wave infrared dual-field-of-view lens described above. Figure 2 It is a dot-matrix diagram. Figure 3 It is an MTF chart. Figure 4 It is a field distortion diagram;

[0036] As can be seen from the figure, various aberrations at each focal length have been well corrected, the blur spots have been corrected to near the size of the Allibben, the MTF is close to the diffraction limit, and the distortion is less than 30%.

[0037] Therefore, it can be seen that the long-wave uncooled boiler temperature measuring lens of the present invention has good imaging quality.

[0038] Through the above steps, a boiler temperature measuring lens for a long-wavelength uncooled detector 150 camera is set up, consisting of an aperture stop 110, a first lens 120, a second lens 130, a secondary imaging lens 140, and an uncooled detector 150. While meeting the requirements for imaging quality, it also has the characteristics of long length, small aperture, and large field of view. This can improve imaging quality, adapt to special application scenarios, optimize optical performance, and improve system integration. This solves the problem that existing uncooled boiler temperature measuring lenses usually have a large field of view. A large field of view means a short focal length, but it requires a very long total optical system length and a very small lens aperture. These are contradictory problems from a traditional perspective.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Therefore, although this specification has described the present invention in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A long-wavelength uncooled boiler temperature measuring lens, comprising a first lens (120); characterized in that: It also includes a second lens (130), a secondary imaging lens (140), an aperture stop (110), and an uncooled detector (150). The aperture stop (110), the first lens (120), the second lens (130), the secondary imaging lens (140), and the uncooled detector (150) are arranged sequentially from the object side to the image side along the optical axis. The uncooled detector (150) includes a protective window (152) and an imaging focal plane (154). The protective window (152) is located in front of the uncooled detector (150), and the imaging focal plane (154) is located behind the protective window (152). It meets the following parameters: EFL = 5mm, F number = 1.5, total length of the optical system including the cooled detector = 150mm, adapter detector 384x288, pixel size 17μm.

2. The long-wave uncooled boiler temperature measuring lens according to claim 1, characterized in that: The first lens (120) is a meniscus germanium positive lens with its concave surface facing the object side, and it has an aspherical surface.

3. The long-wave uncooled boiler temperature measuring lens according to claim 1, characterized in that: The second lens (130) is a meniscus germanium positive lens with its concave surface facing the object side, and it has an aspherical surface.

4. The long-wave uncooled boiler temperature measuring lens according to claim 1, characterized in that: The secondary imaging lens (140) is a meniscus germanium positive lens with its convex surface facing the object side and an aspherical surface on it.

5. A long-wave uncooled boiler temperature measuring lens according to claim 1, characterized in that: The lens's full field of view is 2ω = 95°.

6. A long-wave uncooled boiler temperature measuring lens according to claim 1, characterized in that: The aspherical surfaces in the lens element satisfy the following expression: Where z is the aspherical surface along the optical axis at a height of When the position is such that the distance from the vertex of the non-spherical surface is the sag, The surface curvature is represented by the vertex curvature, k is the conic coefficient, and α2, α3, α4, α5, and α6 are higher-order aspherical coefficients. 。

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