阅读说明：本技术 一种用于高温窑炉内部成像的内窥镜装置 (Endoscope device for high-temperature kiln internal imaging ) 是由 马冬林 刘洋诚 单跃凡 于 2020-04-20 设计创作，主要内容包括：本发明公开了一种用于高温窑炉内部成像的内窥镜装置,包括：正入射视窗、斜入射视窗、内窥镜物镜和内窥镜中继镜；正入射视窗在保证通光的同时将内窥镜物镜与外界高温隔离开；斜入射视窗将侧方斜入射光转变为正入射光进入物镜,同时将内窥镜物镜与外界高温隔离；内窥镜物镜位于正入射视窗或斜入射视窗之后,内窥镜物镜将视场范围内的入射光成像到内窥镜中继镜前；内窥镜中继镜将内窥镜物镜所成的像延伸,用于后续成像。通过斜入射视窗和正入射视窗相结合的方式,采用同一内窥镜物镜和内窥镜中继镜成像,实现了前向180度无死角的成像,克服了高温窑炉内部高温工况,在不影响窑炉正常工作的同时,对窑炉内部进行实时成像,及时发现窑炉内部缺陷。(The invention discloses an endoscope device for high-temperature kiln internal imaging, which comprises: a normal incidence window, an oblique incidence window, an endoscope objective lens and an endoscope relay lens; the normal incidence window can ensure the light transmission and simultaneously isolate the endoscope objective lens from the external high temperature; the oblique incidence window converts the lateral oblique incidence light into normal incidence light to enter the objective lens, and simultaneously isolates the endoscope objective lens from the outside high temperature; the endoscope objective lens is positioned behind the normal incidence window or the oblique incidence window and images the incident light in the field range to the front of the endoscope relay lens; the endoscope relay extends the image formed by the endoscope objective for subsequent imaging. Through the mode that oblique incidence window and normal incidence window combined together, adopt same endoscope objective and endoscope relay lens formation of image, realized the formation of image of 180 degrees no dead angles forward, overcome the inside high temperature operating mode of high temperature kiln, when not influencing the normal work of kiln, to the inside real-time imaging of kiln, in time discover the inside defect of kiln.)

1. The endoscope device for imaging inside the high-temperature kiln is characterized by comprising a normal incidence window, an oblique incidence window, an endoscope objective lens and an endoscope relay lens;

the normal incidence window is used for transmitting light and isolating the endoscope objective lens from external high temperature;

the oblique incidence window is used for converting oblique incidence light into normal incidence light, and the normal incidence light enters the endoscope objective lens, and simultaneously isolates the endoscope objective lens from external high temperature; the field of view of the oblique incidence window is-90 DEG to-40 DEG and 40-90 DEG relative to the optical axis of the endoscope objective lens; the view field of the oblique incidence window is connected with the view field of the normal incidence window at-40 degrees to form a front hemispherical view field at-90 degrees;

the endoscope objective lens is positioned behind the normal incidence window or the oblique incidence window; the endoscope objective lens is used for imaging incident light in a range of-40 degrees relative to the optical axis of the endoscope objective lens to the front of the endoscope relay lens;

the endoscope objective lens comprises a first single lens, a second single lens, a first doublet, a second doublet and a third single lens which are sequentially arranged;

the first single lens and the second single lens form reasonable focal power distribution, and the generation of high-order aberration is reduced;

the first cemented doublet is used for correcting chromatic dispersion and introducing negative spherical aberration to correct system spherical aberration;

the second double cemented lens is used for correcting chromatic dispersion and field curvature;

the third single lens enables the aberration of the endoscope objective lens and the aberration of the endoscope relay lens to be mutually offset by correcting spherical aberration;

the endoscope relay lens is used for extending the image formed by the endoscope objective lens for subsequent imaging; the endoscope relay lens is one inch in diameter.

2. The endoscopic device for high temperature furnace internal imaging according to claim 1, wherein the normal incidence window is a first flat glass.

3. The endoscopic device for high temperature furnace internal imaging according to claim 2, wherein the first flat glass is sapphire glass.

4. The endoscopic device for high temperature furnace interior imaging according to claim 1, wherein the oblique incidence window comprises a second flat glass and a reflector, which in combination convert oblique incidence light into normal incidence light entering the endoscope objective lens.

5. The endoscopic device for high temperature furnace internal imaging according to claim 4, wherein the second plate glass is sapphire glass.

6. The endoscopic device for high temperature kiln internal imaging as defined in claim 1, wherein the first single lens, the second single lens, the third single lens, the first cemented doublet and the second cemented doublet are all standard spherical surfaces and have rotational symmetry.

7. The endoscopic device for high temperature kiln internal imaging as defined in claim 1, wherein the endoscope relay lens comprises four identical doublet cemented lenses;

the double-cemented lens is divided into two groups, each group is formed by oppositely placing two double-cemented lenses, and the double-cemented lenses are used for extending the image formed by the endoscope objective lens to a position one meter behind the endoscope objective lens and are in butt joint with a camera.

Technical Field

The invention relates to the field of traditional optical design, in particular to an endoscope device for high-temperature kiln internal imaging.

Background

The high-temperature kiln endoscope needs to work in a high-temperature environment in the kiln, the endoscope needs to have a certain length to enable the photographic equipment to be far away from the high-temperature kiln, and the diameter of the endoscope is not too large, so that more materials and external dimension factors need to be considered in the design of the high-temperature kiln endoscope.

Because the temperature in the kiln is extremely high, the endoscope objective lens cannot directly work in the kiln even if a water cooling device is arranged. The photographic equipment is more sensitive to the ambient temperature, and the photographic equipment cannot work normally due to the fact that the photographic equipment is too close to the kiln. In addition, the temperature control in the kiln is not favorable due to the overlarge opening, and the endoscope which is too thick cannot normally work through the opening of the kiln.

Therefore, how to design and manufacture an endoscope system capable of working under high temperature, having a long mechanical length and a small diameter is a problem to be solved.

Disclosure of Invention

In view of the above defects or improvement needs in the prior art, an object of the present invention is to provide an endoscope apparatus for imaging inside a high temperature kiln, which can solve the technical problems that during the operation of the high temperature kiln, due to the high internal temperature, the inside of the kiln is difficult to image by a general lens during the operation of the high temperature kiln, and the internal defects cannot be found in time.

In order to achieve the purpose, the invention provides the following scheme:

an endoscopic device for high temperature kiln interior imaging, comprising: a normal incidence window, an oblique incidence window, an endoscope objective lens and an endoscope relay lens;

the normal incidence window is used for transmitting light and isolating the endoscope objective lens from external high temperature;

the oblique incidence window is used for converting the lateral oblique incidence light into normal incidence light, and enabling the normal incidence light to enter the endoscope objective lens, and meanwhile isolating the endoscope objective lens from the outside high temperature; the field of view of the oblique incidence window is-90 DEG to-40 DEG and 40-90 DEG relative to the optical axis of the endoscope objective lens; the view field of the oblique incidence window is connected with the view field of the normal incidence window at-40 to 40 degrees to form a front hemispherical view field at-90 to 90 degrees;

the endoscope objective lens is positioned behind the normal incidence window or the oblique incidence window; the endoscope objective lens is used for imaging incident light in a range of-40 degrees relative to the optical axis of the endoscope objective lens to the front of the endoscope relay lens;

the endoscope objective lens comprises a first single lens, a second single lens, a first doublet, a second doublet and a third single lens which are sequentially arranged;

the first single lens and the second single lens form reasonable focal power distribution, and the generation of high-order aberration is reduced;

the first doublet is used for correcting chromatic dispersion and introducing negative spherical aberration to correct system spherical aberration;

the second double cemented lens is used for correcting chromatic dispersion and correcting field curvature;

the third single lens enables the aberration of the endoscope objective lens and the aberration of the endoscope relay lens to be mutually offset by correcting spherical aberration;

the endoscope relay lens is used for extending the image formed by the endoscope objective lens for subsequent imaging; the endoscope relay lens is one inch in diameter.

Further, the normal incidence window is a first flat glass.

Further, the first plate glass is sapphire glass.

Further, the oblique incidence window comprises a second flat glass and a reflector, and the oblique incidence window and the reflector are combined to convert the oblique incidence light into normal incidence light to enter the endoscope objective lens.

Further, the second plate glass is sapphire glass.

Furthermore, the first single lens, the second single lens, the third single lens and the first cemented doublet stage and the second cemented doublet are all standard spherical surfaces and have rotational symmetry.

Furthermore, the relay lens of the endoscope comprises four identical double-cemented lenses;

the double cemented lens is divided into two groups, each group is formed by two pieces of double cemented lenses which are oppositely arranged, and the double cemented lenses are used for extending an image formed by the objective lens of the endoscope to a position about one meter behind the objective lens of the endoscope and are in butt joint with the camera.

Generally, compared with the prior art, the technical scheme of the invention has the following beneficial effects:

(1) the endoscope device for high-temperature kiln internal imaging provided by the invention can overcome the high-temperature working condition in the high-temperature kiln, can image the inside of the kiln in real time without influencing the normal work of the kiln, can find the defects in the kiln in time, and can guarantee the safe production;

(2) the endoscope device for imaging inside the high-temperature kiln can be inserted into the high-temperature kiln through the smaller opening, so that the interference of the opening on the environment inside the kiln is reduced as much as possible;

(3) the endoscope device for imaging inside the high-temperature kiln can realize forward 180-degree imaging without dead angles in a mode of combining the oblique incidence window and the normal incidence window, and can timely find defects at any position in the kiln.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of an endoscope device for high-temperature kiln internal imaging provided by the invention.

Description of the symbols:

1-normal incidence window, 2-oblique incidence window, 3-endoscope objective lens and 4-endoscope relay lens.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide an endoscope device for imaging inside a high-temperature kiln, which realizes forward 180-degree dead-angle-free imaging by adopting the same endoscope objective lens and endoscope relay lens through a mode of combining an oblique incidence window and a normal incidence window, overcomes the high-temperature working condition inside the high-temperature kiln, images the inside of the kiln in real time while not influencing the normal work of the kiln, and finds the defects inside the kiln in time. The high-temperature working condition in the high-temperature kiln can be overcome, the normal work of the kiln is not influenced, the real-time imaging is carried out on the inside of the kiln, the defects in the inside of the kiln are found in time, and the safety production is guaranteed; the high-temperature furnace can be inserted into the high-temperature furnace through the small opening, so that the interference of the opening to the internal environment of the furnace is reduced as much as possible.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1, the endoscope apparatus for high temperature kiln internal imaging of the present invention comprises: a normal incidence window 1, an oblique incidence window 2, an endoscope objective lens 3 and an endoscope relay lens 4; the normal incidence window 1 can ensure the light transmission and simultaneously isolate the endoscope objective lens 3 from the outside high temperature; the oblique incidence window 2 converts the side oblique incidence light into normal incidence light to enter the endoscope objective lens 3, and simultaneously isolates the endoscope objective lens 3 from the outside high temperature; the endoscope objective 3 images the incident light in the field range in front of the endoscope relay 4; the endoscope relay lens 4 extends the image made by the endoscope objective lens 3 for subsequent imaging.

Specifically, the field range is a range of-40 ° to 40 ° with respect to the optical axis of the endoscope objective lens 3, and within this range, the endoscope objective lens 3 can clearly image.

Specifically, the view field of the oblique incidence window 2 is a view field of-90 to-40 degrees and a view field of 40 to 90 degrees relative to the optical axis of the endoscope objective lens 3, and is connected with the view field of-40 to 40 degrees of the normal incidence window 1 to form a front hemisphere view field of-90 to 90 degrees.

Specifically, the normal incidence window 1 is a first flat glass.

Specifically, the first plate glass is sapphire glass.

Specifically, the oblique incidence window 2 includes a second flat glass and a mirror, which combine to convert the oblique incidence light into normal incidence light to enter the objective lens.

Specifically, the second plate glass is sapphire glass.

Specifically, the endoscope objective lens 3 includes three single lenses and two double cemented lenses, and is a first single lens, a second single lens, a first double cemented lens, a second double cemented lens and a third single lens which are sequentially placed, the first single lens and the second single lens form reasonable focal power distribution, generation of high-order aberration is reduced, the first double cemented lens introduces negative spherical aberration while correcting chromatic dispersion to correct system spherical aberration, the second double cemented lens corrects field curvature while correcting chromatic dispersion, the third single lens enables the aberration of the endoscope objective lens and the aberration of the endoscope relay lens to be mutually offset by correcting spherical aberration, and imaging quality of the high-temperature kiln endoscope apparatus is guaranteed, and the endoscope objective lens 3 is located behind the positive incidence window 1 or the oblique incidence window 2.

Specifically, the single lens and the double cemented lens are both standard spherical surfaces and have rotational symmetry.

Specifically, the endoscope relay lens 4 includes four identical double cemented lenses, which are divided into two groups, each group is formed by two oppositely placed double cemented lenses, and is used for extending an image formed by the endoscope objective lens 3 to a position about one meter behind the endoscope objective lens 3 and butting with the camera. The endoscope relay lenses 4 are each one inch (25.4mm) in diameter.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.