CN102147291A - Medium-wave infrared dual field-of-view integration thermal imaging system - Google Patents
Medium-wave infrared dual field-of-view integration thermal imaging system Download PDFInfo
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- CN102147291A CN102147291A CN201110058980.7A CN201110058980A CN102147291A CN 102147291 A CN102147291 A CN 102147291A CN 201110058980 A CN201110058980 A CN 201110058980A CN 102147291 A CN102147291 A CN 102147291A
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Abstract
The invention relates to a medium-wave infrared dual field-of-view integration thermal imaging system. In an optical path structure of the system, a fixed lens group A, a changing-over lens group B and a focusing lens group C are arranged along the incidence direction of light rays from left to right, wherein the fixed lens group A is sequentially provided with a positive crescent-shaped lens A-1 and a negative crescent-shaped lens A-2; the changing-over lens group B is provided with a long locus lens group B-long and a short focus lens group B-short which can be changed mutually; the long locus lens group B-long is sequentially provided with a positive crescent-shaped lens B-long-1, a negative crescent-shaped lens B-long-2, a negative crescent-shaped lens B-long-3, a plane concave lens B-long-4 and a positive crescent-shaped lens B-long-5; the short focus lens group B-short is sequentially provided with a negative crescent-shaped lens B-short-1, a positive crescent-shaped lens B-short-2, a negative crescent-shaped lens B-short-3, a plane concave lens B-short-4 and a positive crescent-shaped lens B-short-5; and the focusing lens group C is formed by the a positive crescent-shaped lens.
Description
Technical field
The invention belongs to field of photoelectric technology, relate to medium wave infrared optics camera head, the infrared two grades of integrated thermal imaging systems in visual field of particularly a kind of medium wave.
Background technology
It is far away that infrared imaging has night operating distance; Good in anti-interference performance; The environment suitability is better than visible light; Penetrate flue dust, the haze ability is strong; Can be round-the-clock, advantage such as round-the-clock work.Over nearly 10～15 years, infrared thermal imaging technique has obtained using widely at military, paramilitary and civil area, and the infrared photography camera lens of all size of adapted also arises at the historic moment with it.But single visual field is only arranged, and in total transmissivity formula infrared photography camera lens, the focal length of camera lens is short, the detection range of system is short.
Summary of the invention
The objective of the invention is at present and the specification kind of the camera lens of ir imaging system adapted few, great majority are the present situation of short-focus lens, the research and design focal length is longer, two grades of visual field camera lenses that can conveniently switch again.Make thermal imaging system carry out tracking measurement: both can carry out the general survey of big zone, little multiplying power to target, also can carry out the detailed observation of zonule, big multiplying power to target to distant object.
Technical scheme of the present invention is: the infrared two grades of integrated thermal imaging systems in visual field of a kind of medium wave, it is characterized in that: in its light channel structure along light from left to right incident direction be provided with fixed mirror group A, switch mirror group B and focusing lens group C, described fixed mirror group A is provided with positive crescent lens A-1 and negative crescent lens A-2 successively, described switching mirror group B is provided with the long and short-focus mirror group B-weak point of the long lens group B-that can replace mutually, the long positive crescent lens B-long-1 that is provided with successively of described long lens group B-, negative crescent lens B-long-2, negative crescent lens B-long-3, plano-concave lens B-long-4 and positive crescent lens B-long-5; Short being provided with successively of described short-focus mirror group B-born short by-1, the positive crescent lens B-weak point-2 of crescent lens B-, negative crescent lens B-weak point-3, plano-concave lens B-short-4 and positive crescent lens B-weak point-5, and described focusing lens group C is made of positive crescent lens.
The invention has the advantages that: the wave spectrum of this infrared thermal imaging pick-up lens has covered the atmospheric infer-red transmission window of 3um-5um, for double-view field switches pick-up lens.Short burnt end have big visual field, can the extensive search monitoring objective; Long burnt end has that focal length is long, relative aperture is big, makes system greatly improve detection range, and observed object in detail.
The present invention has carried out ray machine to system does not have the thermalization design, adapts to the big occasion of variation of ambient temperature is monitored.The present invention has carried out the system integration design, and making pick-up lens and medium wave infrared eye interworking is one, mechanism's compactness of medium wave infra-red thermal imaging system, little, in light weight, the good looking appearance of volume.
Description of drawings
Fig. 1 is a light channel structure synoptic diagram of the present invention.
Fig. 2 is a structural scheme of mechanism of the present invention.
Fig. 3 is the A-A cut-open view of Fig. 2.
Fig. 4 is the structural representation of visual field of the present invention switching mechanism.
Fig. 5 is the B-B cut-open view of Fig. 4.
Fig. 6 is the partial enlarged view of Fig. 5.
Fig. 7 is the structural representation of focus adjusting mechanism of the present invention.
Fig. 8 is the structural representation of cap-opening mechanism of the present invention.
Embodiment
With reference to figure 1, the infrared two grades of integrated thermal imaging systems in visual field of a kind of medium wave, it is characterized in that: in its light channel structure along light from left to right incident direction be provided with fixed mirror group A, switch mirror group B and focusing lens group C, described fixed mirror group A is provided with positive crescent lens A-1 and negative crescent lens A-2 successively; Described switching mirror group B is provided with the long and short-focus mirror group B-weak point of the long lens group B-that can replace mutually, described long lens group B-length is provided with long by-2, the negative crescent lens B-length-3 of long by-1, the negative crescent lens B-of positive crescent lens B-, plano-concave lens B-long-4 and positive crescent lens B-long-5 successively, short being provided with successively of described short-focus mirror group B-born short by-1, the positive crescent lens B-weak point-2 of crescent lens B-, negative crescent lens B-weak point-3, plano-concave lens B-short-4 and positive crescent lens B-weak point-5, and described focusing lens group C is made of positive crescent lens.
When switching mirror group B is long lens group B-length, between preceding fixed mirror group A and switching mirror group B-are long is 110.55mm at interval, the air-gap that switches between mirror group B and the focusing group C is 26.12mm at interval, among the fixing group A: the airspace between positive crescent lens A-1 and the negative crescent lens A-2 is 4.37mm, during long lens group B-was long: the airspace between positive crescent lens B-long-1 and the negative crescent lens B-long-2 was 0.91mm, air-gap between negative crescent lens B-long-2 and the negative crescent lens B-long-3 is 9.09mm at interval, air-gap between negative crescent lens B-long-3 and the plano-concave lens B-long-4 is 25.58mm at interval, and the air-gap between plano-concave lens B-long-4 and the positive crescent lens B-long-5 is 3.58mm at interval.
When switch mirror group B be short-focus mirror group B-in short-term, fixed mirror group A and the airspace of switching between the mirror group B-weak point are 130.21mm, the airspace of switching between mirror group B and the focusing lens group C is 18.3mm, among the fixing group A: the airspace between positive crescent lens A-1 and the negative crescent lens A-2 is 4.37mm, short-focus mirror group B-brachymedial, airspace between negative crescent lens B-short-1 and the positive crescent lens B-short-2 is 0.63mm, air-gap between positive crescent lens B-short-2 and the negative crescent lens B-short-3 is 7.77mm at interval, air-gap between negative crescent lens B-short-3 and the plano-concave lens B-short-4 is 5.24mm at interval, and the airspace between plano-concave lens B-short-4 and the positive crescent lens B-short-5 is 3.72mm.
With reference to figure 2 and Fig. 3, fixing group A is arranged in the preceding arrangement of mirrors tube 1 before described, arrangement of mirrors tube rear side is connected with a rotation lens barrel 2 before described, in the described rotation lens barrel length is set, the switching mirror group of short focal length, long lens group B-is long and short-focus mirror group B-is short symmetrical in the rotation lens barrel is installed, described rotation lens barrel middle part is provided with rotation central axis 3, rotation lens barrel outside is provided with and is used for the motor gear 5 by motor 4 drivings that the driven rotary lens barrel rotates, described rotating mirror drum outer wall is provided with the tooth that is used for the motor gear engagement, described rotation lens barrel rear side is connected with focusing drawtube 6, described focusing drawtube is equipped with focusing lens group C, the described focusing drawtube outside is provided with focus adjusting mechanism, described focusing drawtube rear side is connected with thermal imaging system 7, the coaxial installation of optical axis of the target surface center of described thermal imaging system and each set of shots, thermal imaging system frame 37 outsides are provided with the all-in-one casing of fixedlying connected with preceding arrangement of mirrors tube.
The side wall upper part of described thermal imaging system frame is provided with some radially-arranged set screw 8 that are used to regulate thermal imaging system target surface center left and right directions; The lower sidewall of described thermal imaging system frame is provided with some to being used to regulate the set screw 9 of thermal imaging system target surface center above-below direction; side is respectively equipped with thermal imaging system elongated slot 10 is installed before and after the sidewall of described thermal imaging system frame; thermal imaging system is fixed by passing the thermal imaging system lock-screw 11 that elongated slot is installed; described all-in-one cabinet is made up of loam cake 12, side plate 13, side plate 14 and base plate 15; the connecting portion of described cabinet is provided with O-ring seal 16; be used to guarantee the impermeability in the cabinet, be provided with integral machine control panel 17 between described cabinet and the thermal imaging system frame.
The center of thermal imaging system target surface requires with the optical axis of medium wave infrared lens coaxial among the present invention, integrated for the coaxial and structure that realizes optical axis and electric axis, at first utilize thermal imaging system that elongated slot is installed, adjust the axle of thermal imaging system and go up the position, the thermal imaging system target surface is overlapped with image planes position on axle of camera lens, and it is clear promptly to focus.Pretension thermal imaging system lock-screw, adjusting is used to regulate the set screw of thermal imaging system target surface center left and right directions, the center left and right directions of thermal imaging system target surface is overlapped with camera lens target surface center left and right directions, adjusting is used to regulate the set screw of thermal imaging system target surface center above-below direction, the upper-lower position at the target surface center of thermal imaging system is overlapped fully with camera lens target surface center, be that camera lens optical axis overlaps with the thermal imaging system electric axis, at last lock-screw locked that camera lens optical axis and electric axis adjustment finish.In order to design integral machine smaller and more exquisitely, and debugging is convenient, and described all-in-one cabinet is made up of loam cake, left plate, right plate and base plate, and the control panel side of integral machine is hung on the side plate; During installation, after adjustment camera lens optical axis and thermal imaging system electric axis are coaxial, again four cover plates are loaded onto and covered to the O type circle of sealing, all-in-one is debug and is finished.The present invention adopts whole airtight form to seal, and seals with the O RunddichtringO between pick-up lens and the pressurized capsule body, also adopts the O RunddichtringO to seal between pressurized capsule body and each cover plate, to adapt to the request for utilization of varying environment.The pressurized capsule body adopts compact design, guarantee structural strength, sealing, easily under the situation of installation property, control the physical dimension of pressurized capsule body as far as possible, makes the physical dimension of pick-up lens little.The control signal of pick-up lens all by the seal socket output of cabin body rearmost end, is transferred to back-end computer and controls simultaneously, improves the intellectuality control of pick-up lens.
With reference to figure 4, Fig. 5 and Fig. 6, described rotation lens barrel perimembranous side is provided with a long lens group microswitch assembly 18 and a short-focus mirror group microswitch assembly 19, be equipped with on the rotation lens barrel perimembranous that long lens group microswitch is dialled nail 20 and short-focus mirror group microswitch is dialled nail 21, described each microswitch is dialled the nail middle part and is provided with through hole 22, the through hole inner bottom part is provided with steel ball 23, the steel ball upper lateral part is provided with locating shaft 24, be arranged with spring 25 and spring pressuring ring 26 on the described locating shaft, described microswitch is dialled the head of nail for being used to make length, the pinpoint mechanical positioning frame 39 of short burnt optical module, described mechanical positioning frame is provided with mechanical positioning lock-screw 36, also is provided with the rotating location V groove 38 that cooperates with steel ball on the described rotation lens barrel.
In order to realize changing the purpose of camera lens visual field, designed the rotation lens barrel, long lens group and short-focus mirror group are installed in respectively on the position of 180 ° of symmetries of rotating disk, motor is by the rotation of motor gear driven rotary lens barrel, make the long lens group and the short-focus mirror group of camera lens enter optical axis respectively, realize the various combination of optical system; Both sides at the rotation lens barrel are equipped with the microswitch assembly, on the rotation lens barrel, microswitch is installed and is dialled nail, when driven by motor rotation lens barrel turns clockwise certain angle, microswitch is dialled the shell fragment that nail is run into microswitch, make microswitch from the closure state to the off-state, sample circuit is exported by low level to high level, after CPU receives the microswitch signal, the stop motion of order motor, selection is suitable for the relative angle that the long microswitch of long lens group B-is dialled nail and microswitch assembly, can make the long lens group be parked on the camera lens optical axis exactly, require CPU to send heterodromous instruction to motor this moment, so that motor do not work under the stall state, thus the protection motor; With sending the counter motion instruction by CPU, select to be appropriate to the relative angle that the short microswitch of short-focus mirror group B-is dialled nail and microswitch assembly, the short-focus mirror group is parked on the optical axis of camera lens.
Because the elastic force repeatability of microswitch is good inadequately,, therefore also designed V groove location structure if only can't accurately locate long and short burnt mirror group by microswitch.During the motion of driven by motor rotating disk, location V groove moves together, when the V groove when the steel ball, steel ball is at spring, under the elastic force effect of locating shaft, fall in the middle of the V groove, the regulating spring trim ring, make the friction force of the elastic force of steel ball greater than motor reduction gearbox, then steel ball is fallen in the middle of the V groove, release mechanism positioning and locking screw, adjust the mechanical positioning frame, when making steel ball fall the V groove, optical module is just in time on optical axis, and microswitch is at open position, pass through two mechanical positioning assemblies and two V grooves like this with the synergy of two microswitch assemblies, just can realize long, the accurate location of short burnt optical module.
With reference to figure 7, described focus adjusting mechanism comprises the coaxial hard-wired focusing mount 27 with focusing lens group C, described focusing mount links to each other with focusing drawtube by guide pin 28, focusing ring 29 connects with focusing drawtube by trapezoidal pitch thread, focusing ring connects with focusing mount by left-hand thread (LHT), described focusing ring perimembranous is provided with the tooth with motor gear 30 matches, can be driven by motor 35 to realize rotating.
When motor rotation, the motion of drive motor gear, motor gear and focusing ring engaged transmission are rotated focusing ring, and focusing ring connects with body tube by trapezoidal tooth, connect with left-hand thread (LHT) with focusing mount, guide pin is used for changing the direction of motion of focusing mount, makes it become rectilinear motion from circular motion, and the circular motion of motor drives focusing mount and does rectilinear motion like this, the rotating campaign of motor can drive the focusing group and seesaw, thereby realizes the focusing purpose.
With reference to figure 8 and Fig. 9, described camera lens has electronic cover opening mechanism, described electronic cover opening mechanism by motor, the gear train assembly that links to each other with motor, set out the worm-and-wheel gear that system links to each other with gear and the mechanical arm that links to each other with the worm and gear structure is formed, described mechanical arm links to each other with lens cap.
Described lens cap rear end face sandblast oxygen is black, can use as the image of N Reference Alignment thermal imaging system as the datum plate of thermal imaging system when Jing Gai closes.
During motor rotation, drive the rotation of motor driving wheel, motor driving wheel 31 drives the engaged wheel motion 32 of uncapping by gearing mesh, and uncap engaged wheel and worm screw 33 are linked together, and worm screw drives worm gear 34 motions.The direction of motion of worm gear changes 90 °, and worm gear drives the lid folding by mechanical arm, therefore when the positive and negative direction of motor is moved, drives the folding of mirror lid by the worm and gear cap-opening mechanism.
The present invention has carried out the system integration design, and making pick-up lens and medium wave infrared eye interworking is one, mechanism's compactness of medium wave infra-red thermal imaging system, little, in light weight, the good looking appearance of volume.
The infrared two grades of performance index that the integrated thermal imaging system in visual field reaches of medium wave:
1, service band: 3um～5um;
2, field angle: 9 ° of 2 ω=12 ° x; 1.5 ° of 2 ° of x; (focal length: f '
1=45mm; F '
2=270mm)
3, relative aperture D/f '=1/2;
4, transmitance T 〉=75%;
5, thermal imaging system resolution: with 320x240(pixel size 30um) is adaptive;
6, working temperature :-40 ℃～+ 60 ℃;
7, object distance: ∞～50m;
Two grades of time≤2s that switch the visual field.
Claims (9)
1. infrared two grades of integrated thermal imaging systems in visual field of medium wave, it is characterized in that: in its light channel structure along light from left to right incident direction be provided with fixed mirror group A, switch mirror group B and focusing lens group C, described fixed mirror group A is provided with positive crescent lens A-1 and negative crescent lens A-2 successively, described switching mirror group B is provided with the long and short-focus mirror group B-weak point of the long lens group B-that can replace mutually, the long positive crescent lens B-long-1 that is provided with successively of described long lens group B-, negative crescent lens B-long-2, negative crescent lens B-long-3, plano-concave lens B-long-4 and positive crescent lens B-long-5, short being provided with successively of described short-focus mirror group B-born crescent lens B-short-1, positive crescent lens B-short-2, negative crescent lens B-short-3, plano-concave lens B-short-4 and positive crescent lens B-are short by-5, and described focusing lens group C is made of positive crescent lens.
2. the infrared two grades of integrated thermal imaging systems in visual field of medium wave according to claim 1, it is characterized in that: when switching mirror group B is long lens group B-length, between preceding fixed mirror group A and switching mirror group B-are long is 110.55mm at interval, the air-gap that switches between mirror group B and the focusing group C is 26.12mm at interval, among the fixing group A: the airspace between positive crescent lens A-1 and the negative crescent lens A-2 is 4.37mm, during long lens group B-was long: the airspace between positive crescent lens B-long-1 and the negative crescent lens B-long-2 was 0.91mm, air-gap between negative crescent lens B-long-2 and the negative crescent lens B-long-3 is 9.09mm at interval, air-gap between negative crescent lens B-long-3 and the plano-concave lens B-long-4 is 25.58mm at interval, and the air-gap between plano-concave lens B-long-4 and the positive crescent lens B-long-5 is 3.58mm at interval.
3. the infrared two grades of integrated thermal imaging systems in visual field of medium wave according to claim 1, it is characterized in that: when switch mirror group B be short-focus mirror group B-in short-term, fixed mirror group A and the airspace of switching between the mirror group B-weak point are 130.21mm, the airspace of switching between mirror group B and the focusing lens group C is 18.3mm, among the fixing group A: the airspace between positive crescent lens A-1 and the negative crescent lens A-2 is 4.37mm, short-focus mirror group B-brachymedial, airspace between negative crescent lens B-short-1 and the positive crescent lens B-short-2 is 0.63mm, air-gap between positive crescent lens B-short-2 and the negative crescent lens B-short-3 is 7.77mm at interval, air-gap between negative crescent lens B-short-3 and the plano-concave lens B-short-4 is 5.24mm at interval, and the airspace between plano-concave lens B-short-4 and the positive crescent lens B-short-5 is 3.72mm.
4. the infrared two grades of integrated thermal imaging systems in visual field of medium wave according to claim 1, it is characterized in that: fixing group A is arranged in the preceding arrangement of mirrors tube before described, arrangement of mirrors tube rear side is connected with a rotation lens barrel before described, in the described rotation lens barrel length is set, the switching mirror group of short focal length, long lens group B-is long and short-focus mirror group B-is short symmetrical in the rotation lens barrel is installed, described rotation lens barrel middle part is provided with rotation central axis, rotation lens barrel outside be provided be used for that the driven rotary lens barrel rotates by motor-driven motor gear, described rotating mirror drum outer wall is provided with the tooth that is used for the motor gear engagement, described rotation lens barrel rear side is connected with focusing drawtube, the focusing lens group is installed in the described focusing drawtube, the described focusing drawtube outside is provided with focus adjusting mechanism, described focusing drawtube rear side is connected with thermal imaging system, the coaxial installation of optical axis of the target surface center of described thermal imaging system and each set of shots, the thermal imaging system frame outside is provided with the all-in-one casing of fixedlying connected with preceding arrangement of mirrors tube.
5. the infrared two grades of integrated thermal imaging systems in visual field of medium wave according to claim 4; it is characterized in that: the side wall upper part of described thermal imaging system frame is provided with some radially-arranged set screw that are used to regulate thermal imaging system target surface center left and right directions; the lower sidewall of described thermal imaging system frame is provided with some to being used to regulate the set screw that put down up and down at thermal imaging system target surface center; side is respectively equipped with thermal imaging system elongated slot is installed before and after the sidewall of described thermal imaging system frame; thermal imaging system is fixed by passing the thermal imaging system lock-screw that elongated slot is installed; described all-in-one cabinet is by loam cake; side plate; side plate and base plate are formed; the connecting portion of described cabinet is provided with O-ring seal; be used to guarantee the impermeability in the cabinet, be provided with the integral machine control panel between described cabinet and the thermal imaging system frame.
6. the infrared two grades of integrated thermal imaging systems in visual field of medium wave according to claim 4, it is characterized in that: the outside side of described rotation lens barrel is provided with a long lens group microswitch assembly and a short-focus mirror group microswitch assembly, be equipped with on the rotation lens barrel perimembranous that long lens group microswitch is dialled nail and short-focus mirror group microswitch is dialled nail, described two microswitches are dialled the nail middle part and are provided with through hole, the through hole inner bottom part is provided with steel ball, the steel ball upper lateral part is provided with locating shaft, be arranged with spring and spring pressuring ring on the described locating shaft, described microswitch is dialled the head of nail for being used to make length, the pinpoint mechanical positioning frame of short burnt optical module, described mechanical positioning frame is provided with the mechanical positioning lock-screw, also is provided with the rotating location V groove that cooperates with steel ball on the described rotation lens barrel.
7. the infrared two grades of integrated thermal imaging systems in visual field of medium wave according to claim 4, it is characterized in that: described focus adjusting mechanism comprises the coaxial hard-wired focusing mount with focusing lens group C, described focusing mount links to each other with focusing drawtube by guide pin, focusing ring connects with focusing drawtube by trapezoidal pitch thread, focusing ring connects with focusing mount by left-hand thread (LHT), described focusing ring perimembranous is provided with the tooth with the motor gear match, can be realized rotating by driven by motor.
8. the infrared two grades of integrated thermal imaging systems in visual field of medium wave according to claim 4, it is characterized in that: described camera lens has electronic cover opening mechanism, described electronic cover opening mechanism by motor, the gear train assembly that links to each other with motor, set out the worm-and-wheel gear that system links to each other with gear and the mechanical arm that links to each other with the worm and gear structure is formed, described mechanical arm links to each other with lens cap.
9. the infrared two grades of integrated thermal imaging systems in visual field of medium wave according to claim 8 is characterized in that: described lens cap rear end face sandblast oxygen is black.
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| CN103676151A (en) * | 2013-12-20 | 2014-03-26 | 河北汉光重工有限责任公司 | Near-infrared dual-field imaging system with high transmittance |
| CN106249383A (en) * | 2016-08-30 | 2016-12-21 | 福建福光股份有限公司 | Two grades of visual field tracking measurement camera lenses of long-focus |
| CN106842485A (en) * | 2017-04-17 | 2017-06-13 | 福建福光天瞳光学有限公司 | The electronic whole group focusing type non-brake method camera lens of three-chip type far infrared |
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