CN109283663A - A kind of big visual field, high-resolution industrial endoscope optical system - Google Patents
A kind of big visual field, high-resolution industrial endoscope optical system Download PDFInfo
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- CN109283663A CN109283663A CN201811366345.3A CN201811366345A CN109283663A CN 109283663 A CN109283663 A CN 109283663A CN 201811366345 A CN201811366345 A CN 201811366345A CN 109283663 A CN109283663 A CN 109283663A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides
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Abstract
The invention discloses a kind of big visual fields, high-resolution industrial endoscope optical system, including the wide-angle objective lens system, field lens and optical fiber image transmission beam being sequentially distributed along optical axis by object side to image side；The wide-angle objective lens system includes negative lens group, aperture diaphragm and the positive lens groups being sequentially distributed along optical axis by object side to image side；The field lens is arranged in the inclined object side direction in focal plane of the wide-angle objective lens system；The optical fiber image transmission beam is arranged on the focal plane of the wide-angle objective lens system, adjacent with the field lens.Relay system using optical fiber image transmission beam as industrial endoscope optical system, length is adjustable, adapts to demand of the different industrial furnaces to device length.Telecentric beam path in image space is realized using field lens, and the light of preposition optical system is made to fully enter optical fiber.The design of preposition wide-angle objective lens system is matched with each performance parameter of optical fiber image transmission beam, technical indicator, counter to take the photograph remote structure and ensure that the big visual field and image sensors' uniformity of optical system.Entire optical system resolution ratio is big, and color difference is small, and imaging effect is good.
Description
Technical field
The invention belongs to optical technical field more particularly to a kind of big visual fields, high-resolution industrial endoscope optical system.
Background technique
Industrial furnace is generally existing in a variety of industries, such as blast furnace, coke-fired furnace in metallurgy industry etc., glass manufacture row
Glass furnace etc. in industry, the rotary kiln etc. in cement industry.With the high speed development of industry, in order to monitor key parameter in furnace
With operating condition, the demand that endoscope is installed on the various closed stoves of industry is more more and more urgent.However the operation of industrial furnace
Environment is complicated, there is high temperature mostly, and the transition temperature and thermal refractive index coefficient to lens material in optical system require tight
Lattice.The imaging area of demand is big in stove simultaneously, field angle and resolution ratio burden to optical system.
Patent of invention at present about the specific Optical System Design of industrial endoscope is less, is mostly the mechanical knot of endoscope
Structure design.Patent publication No. CN1255631A patent of invention provides a kind of optical system of high temperature visible image capturing camera lens.Its
Principle is using second level relay structure, so that hundred times or more in its focal length of structure overall length, it is sufficient to set the detector of focal plane
It sets except high temperature furnace furnace wall, avoids detector in the influence of blast furnace internal high temperature.But it uses lens as relay system
Extend optical path to be easy to generate optical system from the point of view of the mounting means in conjunction with endoscope so that whole equipment weight increase is very big
Deformation is to out of focus.60 ° of full filed angle can not obtain comprehensive image letter in the huge various industrial furnaces in space simultaneously
Breath.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the shortcomings of to mention in background above technology and defect, provide one
Kind big visual field, high-resolution industrial endoscope Optical System Design, this optical system can be applied to various industrial sealed furnaces so as to
Monitor key parameter and operating condition in furnace.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of big visual field, high-resolution industrial endoscope optical system, including be sequentially distributed by object side to image side along optical axis
Wide-angle objective lens system, field lens and optical fiber image transmission beam；The wide-angle objective lens system includes successively being divided along optical axis by object side to image side
Negative lens group, aperture diaphragm and the positive lens groups of cloth；The focal plane side Pian Wu of the wide-angle objective lens system is arranged in the field lens
On direction；The optical fiber image transmission beam is arranged on the focal plane of the wide-angle objective lens system, adjacent with the field lens.
Further, 130~150mm of the wide-angle objective lens system overall length, 6~10mm of focal length, full filed angle 100~
120 °, F number is 6~10.
Further, the negative lens group includes the with negative power being sequentially distributed along optical axis by object side to image side
One lens and the second lens with positive light coke, the first lens object side and image side surface are concave surface, the second lens object side
It is convex surface with image side surface.
Further, the first focal length of lens range are as follows: -23 < f1< -22, unit mm, used glass refraction range
Are as follows: 1.61 < nd< 1.62, Abbe number range are as follows: 58 < vd<59；
Second focal length of lens range are as follows: 60 < f2< 61, unit mm, used glass refraction range are as follows: 1.61 < nd<
1.62, Abbe number range are as follows: 58 < vd<59。
Further, the positive lens groups include the with negative power being sequentially distributed along optical axis by object side to image side
Three lens, the 4th lens with positive light coke and the 5th lens with positive light coke, the third lens object side are convex surface, as
Side is concave surface；4th lens object side and be convex surface；5th lens object side and image side surface are convex surface.
Further, the third lens focal range are as follows: -13 < f3< -12, unit mm, used glass refraction range
Are as follows: 1.71 < nd< 1.72, Abbe number range are as follows: 29 < vd<30；
4th focal length of lens range are as follows: 14 < f1< 15, unit mm, used glass refraction range are as follows: 1.61 < nd<
1.62.Abbe number range are as follows: 58 < vd<59；
5th focal length of lens range are as follows: 14 < f1< 15, unit mm, used glass refraction range are as follows: 1.61 < nd<
1.62.Abbe number range are as follows: 58 < vd<59。
Further, field lens object side and image side surface are all convex surfaces, focal length be wide-angle objective lens system emergent pupil face with
The distance of focal plane, range are as follows: 22 < f < 23, unit mm, ranges of indices of refraction are as follows: 1.51 < nd< 1.52, Abbe number range are as follows: 64 <
vd<65。
Further, the optical fiber image transmission beam limiting resolution is 72lp/mm.
All kinds of stoves in industrial processes situations such as generally there are closed, high temperature.For convenience of closed guarantee safety, peace
The peephole of dress industrial endoscope cannot be opened too big；Guarantee optical system normal use, the outside of industrial endoscope to adapt to high temperature
Need cooling device.The two limits longitudinal bore of industrial endoscope optical system, therefore the present invention takes coaxial, folding
It penetrates, fixed-focus optical system, greatly reduces longitudinal space required for entire optical system.
In order to completely cut off high temperature, the general furnace wall of industrial furnace is very thick (0.5~1M), if be imaged using common single, optical path
Short, focal plane is too stringent to the high temperature resistance requirement of imaging sensor inside furnace wall, increases cost, and image
Sensor is inconvenient to replace inside furnace wall.Optical system of the present invention using optical fiber image transmission beam will as extend, realize furnace in capture,
The function being imaged outside furnace.The length of optical fiber image transmission beam can be with unrestricted choice, convenient for meeting different size, variety classes industry simultaneously
The demand of the imaging optical system length of furnace.
In view of gauge without light source in the general closed and furnace of industrial furnace or there is the raw material with light absorptive, it is micro- in order to get
Image information in furnace in luminous environment, increases the luminous flux of optical system, and the F number that the present invention uses is 6~10, while appropriate journey
It is as few as possible come the lens numbers for pursuing entire optical system that degree sacrifices image quality.
In order to comprehensively obtain the image information in various types of, major small industrial furnace, optical system of the invention is used
100~120 ° of full filed angles.In view of field angle is larger and furnace in low-light, and symmetrical wide-angle structure field angle of object and image space
Field angle is roughly equal, and illuminance presses cos from center to edge4The velocity attenuation of ω ', wherein ω ' is image space angle of half field-of view.
Therefore preceding group of wide-angle lens using it is asymmetrical it is counter take the photograph remote structure, be made of a negative lens group and a positive lens groups, aperture
The centre of two lens groups is arranged in diaphragm.Negative lens group can collect the big light of incident angle and then is transferred to smaller angle
Positive lens groups, to realize wide-angle image but field angle of object much smaller than field angle of image.It is counter to take the photograph remote structure and ensure that optical system
The big visual field and image sensors' uniformity of system.The lens of wide-angle lens group are high using transition temperature simultaneously and thermal refractive index coefficient is small
Glass, reducing endoscopic apparatus internal temperature variation bring influences, and increases service life of equipment.
Optical fiber image transmission beam transmits light using total reflection principle, the focal plane of the plane of incidence and preceding group of wide-angle lens
It is overlapped, the image-side numerical aperture angle of front end wide-angle lens group and the numerical aperture angle of optical fiber image transmission beam are equal.Light beam is along light on axis
Fine central symmetry is incident on the plane of incidence of image transmission optical fibre, so light beam can fully enter image transmission optical fibre on axis.But the outer light of axis
Beam is symmetrical along chief ray and slants on the plane of incidence of image transmission optical fibre at an angle, and segment beam not can enter image transmission optical fibre
In, cause the marginal belt for exporting image dimmed and increase with visual field to influence to be more obvious.In order to guarantee the image of optical fiber image transmission beam
Quality, the present invention take field lens to change the direction of main axis outside the axis, make axis outer light beam also can be symmetrical along fiber optic hub.Field lens is usual
It is placed on or near the focal plane of preceding group of wide-angle lens, field lens is placed on the inclined object side direction in focal plane by the present invention, for below
Optical fiber image transmission beam vacate installation space.The field lens focal length that the present invention uses for preceding group of wide-angle lens focal plane and emergent pupil face away from
From, therefore optical system just has the effect of telecentric beam path in image space, and the light of preposition optical system is made to fully enter optical fiber.
The design of the preposition wide-angle objective lens system of the present invention is matched with each performance parameter of optical fiber image transmission beam, technical indicator.Entirely
Optical system resolution ratio is big, and color difference is small, and imaging effect is good.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the modulation transfer function figure of the embodiment of the present invention；
Fig. 3 is the point range figure of the embodiment of the present invention；
Fig. 4 is distortion curve of the invention；
Fig. 5 is lateral chromatic aberration figure of the invention.
Specific embodiment
To facilitate the understanding of the present invention, the present invention is done below in conjunction with Figure of description and preferred embodiment more complete
Face meticulously describes, but protection scope of the present invention is not limited to following specific embodiments.
Unless otherwise defined, all technical terms used hereinafter are generally understood meaning phase with those skilled in the art
Together.Technical term used herein is intended merely to the purpose of description specific embodiment, and it is of the invention to be not intended to limitation
Protection scope.
Referring to FIG. 1, the big visual field of a preferred embodiment of the invention, high-resolution endoscope optical system comprising
A wide-angle objective lens system, B field lens, the C optical fiber image transmission beam being sequentially distributed along optical axis by object side to image side.
The following detailed description of optical system various pieces:
A wide-angle objective lens system
The parameter of wide-angle objective lens system are as follows: system overall length 142.7mm, focal length 6mm, 110 ° of full filed angle, F number is 6.It 5
Piece lens are all made of spherical glass, and the negative lens group of the composition of lens 1,2 is arranged in aperture diaphragm 6 and lens 3,4,5 form
Positive lens groups between.Use fiIndicate the focal length of i-th of lens, unit mm.
1 object side of the first lens with negative power is concave surface, and image side surface is also concave surface.Its focal range are as follows: -23 <
f1<-22.Used glass refraction range are as follows: 1.61 < nd<1.62.Abbe number range are as follows: 58 < vd<59。
2 object side of the second lens with positive light coke is convex surface, and image side surface is also convex surface.Its focal range are as follows: 60 < f2
<61.Used glass refraction range are as follows: 1.61 < nd<1.62.Abbe number range are as follows: 58 < vd<59。
3 object side of the third lens with negative power is convex surface, and image side surface is concave surface.Its focal range are as follows: -13 < f3
<-12.Used glass refraction range are as follows: 1.71 < nd<1.72.Abbe number range are as follows: 29 < vd<30。
4 object side of the 4th lens with positive light coke is convex surface, and image side surface is also convex surface.Its focal range are as follows: 14 < f1
<15.Used glass refraction range are as follows: 1.61 < nd<1.62.Abbe number range are as follows: 58 < vd<59。
5 object side of the 5th lens with positive light coke is convex surface, and image side surface is also convex surface.Its focal range are as follows: 14 < f1
<15.Used glass refraction range are as follows: 1.61 < nd<1.62.Abbe number range are as follows: 58 < vd<59。
The distance between each lens interpellation is as follows:
First lens 1 and 2 spacing of the second lens are 29~30mm；
Second lens 2 are 61~62mm with 6 spacing of aperture diaphragm；
Aperture diaphragm 6 and 3 spacing of the third lens are 1~2mm；
The third lens 3 and 4 spacing of the 4th lens are 0.5~1.5mm；
4th lens 4 and 5 spacing of the 5th lens are 0.5~1.5mm.
Entry pupil diameters are chosen for 1mm, can satisfy the demand in application to the depth of field.Entry pupil diameters are mainly by aperture diaphragm
The focal length collective effect of optical system between bore and object space and aperture diaphragm determines.
B field lens
Field lens is single thin lens, and optical system is made to achieve the purpose that image space telecentricity.Its object side and image side surface are all convex
Face, focal length are the emergent pupil face of wide-angle objective lens system at a distance from focal plane, range are as follows: 22 < f < 23, unit mm.It is used
Glass refraction range are as follows: 1.51 < nd<1.52.Abbe number range are as follows: 64 < vd<65。
C optical fiber image transmission beam
According to the performance requirement of aforementioned optical system, the optical fiber image transmission beam that selected from outer diameter be 8mm, filament diameter is 8 μm.
Its length can unrestricted choice, meet various length requirements.The light coherent fiber bundle is by hexagonal array in aforementioned optical system
On focal plane, therefore the limiting resolution of coherent fiber bundle is 72lp/mm, corresponding with aforementioned optical system.The numerical value of optical fiber image transmission beam
Aperture is 0.09 to be greater than pre-objective image-side numerical aperture 0.083, meets the total reflection theorem of optical fiber, therefore incident light beam can be with
Completely into light coherent fiber bundle.
Fig. 2 is the modulation transfer function figure of optical system described in present example, and modulation transfer function characterizes optical system
System is in different space frequency Transfer Contrast ability.Horizontal axis representation space frequency, the longitudinal axis indicate modulation transmission factor MTF.From figure
It can be seen that MTF > 0.5 of the system at Nyquist space frequency 72lp/mm.
Fig. 3 is the point range figure of optical system described in present example, and point range figure shows point by optical system imaging
Dispersion pattern.Horizontal axis and the longitudinal axis all indicate size.The dispersion pattern root mean square of each field angle of the system is equal as seen from the figure
Less than 8 μm.
Fig. 4 is the distortion curve of optical system described in present example, and distortion figure indicates practical image height and ideal picture
High difference.Horizontal axis indicates that distortion percentage, the longitudinal axis indicate half image height.The systematical distortion is no more than -60% as seen from the figure.Though
It so distorts larger, but does not influence imaging definition, and can be corrected by image procossing.
Fig. 5 is the lateral chromatic aberration figure of optical system described in present example, and axial chromatic aberration figure indicates that point is at image position on axis
Set the difference generated by wavelength of light difference.Horizontal axis indicates offset, and the longitudinal axis indicates visual angle.The system is different as seen from the figure
Visual angle maximum transversal color difference is respectively less than 3 μm.
Above-mentioned only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form.Therefore, it is all not
Be detached from technical solution of the present invention content, according to the present invention technical spirit it is made to the above embodiment it is any it is simple modification, etc.
With variation and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (8)
1. a kind of big visual field, high-resolution industrial endoscope optical system, which is characterized in that including along optical axis by object side to image side
Wide-angle objective lens system, field lens and the optical fiber image transmission beam being sequentially distributed；The wide-angle objective lens system includes along optical axis by object side to picture
Negative lens group, aperture diaphragm and the positive lens groups that side is sequentially distributed；The coke that the wide-angle objective lens system is arranged in the field lens is flat
In the inclined object side direction in face；The optical fiber image transmission beam is arranged on the focal plane of the wide-angle objective lens system, adjacent with the field lens.
2. big visual field according to claim 1, high-resolution industrial endoscope optical system, which is characterized in that described wide
Angle objective system 130~150mm of overall length, 6~10mm of focal length, 100~120 ° of full filed angle, F number are 6~10.
3. big visual field according to claim 1 or 2, high-resolution industrial endoscope optical system, which is characterized in that described
Negative lens group includes the first lens with negative power being sequentially distributed along optical axis by object side to image side and has positive light coke
The second lens, the first lens object side and image side surface are concave surface, and the second lens object side and image side surface are convex surface.
4. big visual field according to claim 3, high-resolution industrial endoscope optical system, which is characterized in that first thoroughly
Mirror focal range are as follows: -23 < f1< -22, unit mm, used glass refraction range are as follows: 1.61 < nd< 1.62, Abbe number model
It encloses are as follows: 58 < vd<59；
Second focal length of lens range are as follows: 60 < f2< 61, unit mm, used glass refraction range are as follows: 1.61 < nd< 1.62,
Abbe number range are as follows: 58 < vd<59。
5. big visual field according to claim 1 or 2, high-resolution industrial endoscope optical system, which is characterized in that described
Positive lens groups include the third lens with negative power being sequentially distributed along optical axis by object side to image side, with positive light coke
4th lens and the 5th lens with positive light coke, the third lens object side are convex surface, and image side surface is concave surface；4th lens object
Side and image side surface are convex surface；5th lens object side and image side surface are convex surface.
6. big visual field according to claim 5, high-resolution industrial endoscope optical system, which is characterized in that third is saturating
Mirror focal range are as follows: -13 < f3< -12, unit mm, used glass refraction range are as follows: 1.71 < nd< 1.72, Abbe number model
It encloses are as follows: 29 < vd<30；
4th focal length of lens range are as follows: 14 < f1< 15, unit mm, used glass refraction range are as follows: 1.61 < nd<1.62；
Abbe number range are as follows: 58 < vd<59；
5th focal length of lens range are as follows: 14 < f1< 15, unit mm, used glass refraction range are as follows: 1.61 < nd<1.62；
Abbe number range are as follows: 58 < vd<59。
7. big visual field according to claim 1 or 2, high-resolution industrial endoscope optical system, which is characterized in that described
Field lens object side and image side surface are all convex surfaces, and focal length is the emergent pupil face of wide-angle objective lens system at a distance from focal plane, range are as follows: 22
< f < 23, unit mm, ranges of indices of refraction are as follows: 1.51 < nd< 1.52, Abbe number range are as follows: 64 < vd<65。
8. big visual field according to claim 1 or 2, high-resolution industrial endoscope optical system, which is characterized in that described
Optical fiber image transmission beam limiting resolution is 72lp/mm.
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| CN201811366345.3A CN109283663B (en) | 2018-11-16 | 2018-11-16 | Large-view-field and high-resolution industrial endoscope optical system |
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| CN201811366345.3A CN109283663B (en) | 2018-11-16 | 2018-11-16 | Large-view-field and high-resolution industrial endoscope optical system |
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| CN109283663B CN109283663B (en) | 2019-12-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113822862A (en) * | 2021-09-06 | 2021-12-21 | 中南大学 | Online full-intelligent self-maintenance device and method for high-temperature industrial endoscope of industrial kiln |
| CN115396570A (en) * | 2022-07-12 | 2022-11-25 | 中南大学 | High-temperature industrial endoscope with faint light |
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| JPH08179226A (en) * | 1994-12-22 | 1996-07-12 | Asahi Optical Co Ltd | Objective optical system for endoscope |
| JPH08304710A (en) * | 1995-04-28 | 1996-11-22 | Asahi Optical Co Ltd | Endoscopic objective lens |
| CN102360115A (en) * | 2011-10-12 | 2012-02-22 | 安徽工业大学 | Low-distortion large-field image space telecentric optical device in |
| CN103605204A (en) * | 2013-12-04 | 2014-02-26 | 中南大学 | Parallel low-light-loss high-temperature backlight industrial endoscope |
| CN104122659A (en) * | 2013-04-23 | 2014-10-29 | 张梅 | Zooming optical system, endoscope objective lens system, and electronic endoscope |
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2018
- 2018-11-16 CN CN201811366345.3A patent/CN109283663B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08179226A (en) * | 1994-12-22 | 1996-07-12 | Asahi Optical Co Ltd | Objective optical system for endoscope |
| JPH08304710A (en) * | 1995-04-28 | 1996-11-22 | Asahi Optical Co Ltd | Endoscopic objective lens |
| CN102360115A (en) * | 2011-10-12 | 2012-02-22 | 安徽工业大学 | Low-distortion large-field image space telecentric optical device in |
| CN104122659A (en) * | 2013-04-23 | 2014-10-29 | 张梅 | Zooming optical system, endoscope objective lens system, and electronic endoscope |
| CN103605204A (en) * | 2013-12-04 | 2014-02-26 | 中南大学 | Parallel low-light-loss high-temperature backlight industrial endoscope |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113822862A (en) * | 2021-09-06 | 2021-12-21 | 中南大学 | Online full-intelligent self-maintenance device and method for high-temperature industrial endoscope of industrial kiln |
| CN115396570A (en) * | 2022-07-12 | 2022-11-25 | 中南大学 | High-temperature industrial endoscope with faint light |
| CN115396570B (en) * | 2022-07-12 | 2023-12-12 | 中南大学 | Claustrophote high-temperature industrial endoscope |
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| CN109283663B (en) | 2019-12-06 |
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