CN104198045A - Dual-field-of-view infrared thermal imager - Google Patents
Dual-field-of-view infrared thermal imager Download PDFInfo
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- CN104198045A CN104198045A CN201410483869.6A CN201410483869A CN104198045A CN 104198045 A CN104198045 A CN 104198045A CN 201410483869 A CN201410483869 A CN 201410483869A CN 104198045 A CN104198045 A CN 104198045A
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- thermal infrared
- infrared imager
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Abstract
The invention discloses a dual-field-of-view infrared thermal imager comprising a front lens assembly, a movable lens assembly, a rear lens assembly and an infrared detector. Optical axes of the front lens assembly, the movable lens assembly, the rear lens assembly and the infrared detector coincide with one another, the movable lens assembly is fixedly arranged on a motorized translation stage and capable of moving along the optical axis direction, an infrared detector is fixedly arranged on a precise mechanical sliding table and capable of moving along the optical axis direction, and movement precision of the precise mechanical sliding table is higher than that of the motorized translation stage. When the movable lens assembly is driven by the motorized translation stage to switch fields of view, the infrared detector can be fixedly arranged on the precise mechanical sliding table with movement precision higher than that of the motorized translation stage as being smaller and lighter than the movable lens assembly, so that the infrared detector can perform precise focusing, and imaging of the dual-field-of-view infrared thermal imager is clearer.
Description
Technical field
The present invention relates to a kind of thermal infrared imager.More specifically, relate to a kind of double-view field thermal infrared imager.
Background technology
Thermal infrared imager is more and more extensive in application military, paramilitary, civil area, and the application of a lot of fields needs infrared optical system under multiple focal length mode, to work, to complete search, aiming and the following function of thermal imaging system to target.Fixed-focus system is difficult to satisfy the demand, continuous zoom system is optimal selection, but there is in design larger difficulty, and dual field-of-view infrared optical system is a kind of simple and practical approach that realizes above-mentioned requirements, wherein large visual field or low range pattern can be used for observing large scenery region, search suspected target, small field of view or high magnification pattern can be used for examining or amplification target, and target is identified, follows the tracks of and aimed at.
Double-view field thermal infrared imager is divided into two classes at present: a class is suitching type, changes the focal length of optical system by the lens combination in switchable optics system.The feature of this class optical system is there is no optical movement element in the light path of narrow visual field, its system optical axis good stability, and system switching time is short, transmitance is high; The problem existing is to have the idle state of one group of lens beyond light path, and lens service efficiency is not high, and lens need larger space while switching, thereby optical system lateral dimension is larger.Equations of The Second Kind is axial displacement, the variation of scioptics group axially spaced-apart and change the focal length of optical system, its shortcoming is that axial dimension is larger, but by Optimized System Design, axial dimension is controlled, and can under shorter axial dimension, obtain satisfied image quality.This type of actual practical optical system is made up of first fixing group, zoom group and latter fixing group conventionally.Wherein, fixing group is positive lens, and zoom group is negative lens, and latter fixing group is positive lens, by changing the axial location of zoom group, thereby changes the focal length of whole system, and realizes the blur-free imaging of scenery by the mobile zoom group of trace.In addition, due to the susceptibility of thermal infrared imager to temperature, in the time of temperature variation, the image planes position of infrared optical system has subtle change.Current double-view field thermal infrared imager is all that the axial location by again adjusting zoom group obtains imaging clearly, need on double focus adjusting mechanism, be superimposed with like this micro-adjusting mechanism again, thereby makes the physical construction of focusing very complicated, and focusing accuracy is low.
Summary of the invention
The technical problem to be solved in the present invention is to provide the double-view field thermal infrared imager of the simple imaging clearly of a kind of focusing structure.
For solving the problems of the technologies described above, the present invention adopts following technical proposals:
A kind of double-view field thermal infrared imager, it is characterized in that: comprise front lens group, mobile lens group, rear lens group and infrared eye, the optical axis of described front lens group, mobile lens group, rear lens group and infrared eye overlaps, described mobile lens group is installed on motorized precision translation stage, and can move along optical axis direction, described infrared eye is installed on precision optical machinery slide unit, and can move along optical axis direction, the mobile accuracy of described precision optical machinery slide unit is higher than the mobile accuracy of described motorized precision translation stage.In the time switching visual field under the drive of mobile lens group at motorized precision translation stage, because of infrared eye less than the volume of mobile lens group, lightweight, infrared eye can be installed in than on the higher precision optical machinery slide unit of motorized precision translation stage mobile accuracy, thereby infrared eye can carry out precision focusing, and the imaging of double-view field thermal infrared imager is more clear.
Preferably, this double-view field thermal infrared imager also comprises single-chip microcomputer, described precision optical machinery slide unit comprises for driving its focusing motor moving along optical axis direction, and described single-chip microcomputer sends displacement commands to focusing motor, and described single-chip microcomputer also sends displacement commands to described motorized precision translation stage.Adopt after said structure, precision optical machinery slide unit is driven and is carried out precision focusing by monolithic processor controlled focusing motor, and single-chip microcomputer is also being controlled motorized precision translation stage and carried out visual field switching, thereby makes this double-view field thermal infrared imager carry out full automatic operation.
Preferably, this double-view field thermal infrared imager also comprises temperature sensor, described temperature sensor is arranged on the lens barrel place of this double-view field thermal infrared imager, the temperature signal at the lens barrel place that described temperature sensor collects passes to single-chip microcomputer, and described single-chip microcomputer sends displacement commands according to pre-stored temperature-displacement curve to described focusing motor.Adopt after said structure, this double-view field thermal infrared imager can carry out temperature compensation, and in the time that the temperature at its lens barrel place changes, infrared eye can carry out micro-displacement automatically, thereby obtains imaging clearly.
Preferably, described infrared eye is refrigeration type infrared eye.Refrigeration type infrared eye has higher sensitivity, and temperature measurement accuracy is high.
Brief description of the drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 illustrates structural representation of the present invention.
Embodiment
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive below, should not limit the scope of the invention with this.
As shown in Figure 1, a kind of double-view field thermal infrared imager comprises front lens group 1, mobile lens group 2, rear lens group 3, infrared eye 4, motorized precision translation stage 5, precision optical machinery slide unit 6 and single-chip microcomputer.The optical axis of front lens group 1, mobile lens group 2, rear lens group 3 and infrared eye 4 overlaps; Mobile lens group 2 is installed on motorized precision translation stage 5, and can move along optical axis direction; Infrared eye 4 is installed on precision optical machinery slide unit 6, and can move along optical axis direction; The mobile accuracy of precision optical machinery slide unit 6 is higher than the mobile accuracy of described motorized precision translation stage 5, and the mobile accuracy of precision optical machinery slide unit 6 is 5 μ m.Single-chip microcomputer is controlled respectively the motor of motorized precision translation stage 5 and the focusing motor of precision optical machinery slide unit 6.When single-chip microcomputer sends after the instruction of switching visual field, motorized precision translation stage 5 drives mobile lens group 2 to switch between double-view field, and precision optical machinery slide unit 6 drives infrared eye 4 to focus.The lens barrel place of this double-view field thermal infrared imager is also provided with temperature sensor, temperature signal is passed to single-chip microcomputer by temperature sensor, single-chip microcomputer is according to pre-stored temperature-displacement curve, send displacement commands to focusing motor, focusing motor drives precision optical machinery slide unit 6 to drive infrared eye 4 to carry out displacement, like this when the temperature of double-view field thermal infrared imager changes while making the change in location of its focal plane, the position of infrared eye 4 can be finely tuned, thereby makes the imaging clearly of this double-view field thermal infrared imager.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give all embodiments exhaustively, everyly belong to apparent variation or the still row in protection scope of the present invention of variation that technical scheme of the present invention extends out.
Claims (5)
1. a double-view field thermal infrared imager, is characterized in that: comprise front lens group, mobile lens group, rear lens group and infrared eye, the optical axis of described front lens group, mobile lens group, rear lens group and infrared eye overlaps; Described mobile lens group is installed on motorized precision translation stage, and can move along optical axis direction; Described infrared eye is installed on precision optical machinery slide unit, and can move along optical axis direction; The mobile accuracy of described precision optical machinery slide unit is higher than the mobile accuracy of described motorized precision translation stage.
2. double-view field thermal infrared imager according to claim 1, it is characterized in that: this thermal infrared imager also comprises single-chip microcomputer, described precision optical machinery slide unit comprises the focusing motor for driving it to move along optical axis direction, described single-chip microcomputer sends displacement commands to focusing motor, and described single-chip microcomputer also sends displacement commands to described motorized precision translation stage.
3. double-view field thermal infrared imager according to claim 2, it is characterized in that: this thermal infrared imager also comprises temperature sensor, described temperature sensor is arranged on the lens barrel place of this double-view field thermal infrared imager, the temperature signal at the lens barrel place that described temperature sensor collects passes to single-chip microcomputer, and described single-chip microcomputer sends displacement commands according to pre-stored temperature-displacement curve to described focusing motor.
4. double-view field thermal infrared imager according to claim 1, is characterized in that: the mobile accuracy of described precision optical machinery slide unit is 5 μ m.
5. double-view field thermal infrared imager according to claim 1, is characterized in that: described infrared eye is refrigeration type infrared eye.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410483869.6A CN104198045A (en) | 2014-09-19 | 2014-09-19 | Dual-field-of-view infrared thermal imager |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410483869.6A CN104198045A (en) | 2014-09-19 | 2014-09-19 | Dual-field-of-view infrared thermal imager |
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| CN104198045A true CN104198045A (en) | 2014-12-10 |
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| CN201410483869.6A Pending CN104198045A (en) | 2014-09-19 | 2014-09-19 | Dual-field-of-view infrared thermal imager |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999059015A1 (en) * | 1998-05-08 | 1999-11-18 | Pilkington Pe Limited | Dual field-of-view objective system for the infrared |
| US6118578A (en) * | 1998-05-28 | 2000-09-12 | The United States Of America As Represented By The Secretary Of The Army | Simplified dual field of view afocal |
| GB2339619B (en) * | 1998-05-14 | 2002-05-01 | Pilkington Perkin Elmer Ltd | Optical systems |
| CN201812081U (en) * | 2010-07-16 | 2011-04-27 | 昆明物理研究所 | Mobile zoom dual-FOV infrared optical system with intermediate image surface |
| EP2426540A1 (en) * | 2010-09-02 | 2012-03-07 | Raytheon Company | An optical system |
| US20130044221A1 (en) * | 2011-08-15 | 2013-02-21 | United States Of America, As Represented By The Secretary Of The Army | Dual field of view multi-band optics |
-
2014
- 2014-09-19 CN CN201410483869.6A patent/CN104198045A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999059015A1 (en) * | 1998-05-08 | 1999-11-18 | Pilkington Pe Limited | Dual field-of-view objective system for the infrared |
| GB2339619B (en) * | 1998-05-14 | 2002-05-01 | Pilkington Perkin Elmer Ltd | Optical systems |
| US6118578A (en) * | 1998-05-28 | 2000-09-12 | The United States Of America As Represented By The Secretary Of The Army | Simplified dual field of view afocal |
| CN201812081U (en) * | 2010-07-16 | 2011-04-27 | 昆明物理研究所 | Mobile zoom dual-FOV infrared optical system with intermediate image surface |
| EP2426540A1 (en) * | 2010-09-02 | 2012-03-07 | Raytheon Company | An optical system |
| US20130044221A1 (en) * | 2011-08-15 | 2013-02-21 | United States Of America, As Represented By The Secretary Of The Army | Dual field of view multi-band optics |
Non-Patent Citations (1)
| Title |
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| 唐大为等: "折/衍混合的红外双视场光学系统设计", 《光子学报》 * |
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Application publication date: 20141210 |
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