CN102252762A - Uncooled infrared focal plane imaging system including optical fiber reference optical paths - Google Patents
Uncooled infrared focal plane imaging system including optical fiber reference optical paths Download PDFInfo
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- CN102252762A CN102252762A CN2011100894091A CN201110089409A CN102252762A CN 102252762 A CN102252762 A CN 102252762A CN 2011100894091 A CN2011100894091 A CN 2011100894091A CN 201110089409 A CN201110089409 A CN 201110089409A CN 102252762 A CN102252762 A CN 102252762A
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Abstract
The invention provides an uncooled infrared focal plane array imaging system including optical fiber reference optical paths, comprising infrared imaging optical paths 1 and 2, illumination optical paths 3, 4 and 5, an optical readout optical path 6, optical reference optical paths 7 and 8 and an image acquiring and processing system 9. The infrared imaging optical path 1 images an external target onto the infrared imaging optical path 2, thus the infrared imaging optical path 2 generates a corresponding change; the light sent out by the illumination optical path 3 is aligned to be divided into two beams by the illumination optical path 5; one beam is irradiated to the infrared imaging optical path 2, subjected to spatial modulation by the infrared imaging optical path 2 and then focused by the optical readout optical path 6 to be imaged on the image acquiring and processing system 9, and the other beam is focused by the optical reference optical path 7 and runs through the optical reference optical path 8 to be imaged on the image acquiring and processing system 9; and the image acquiring and processing system 9 is used for processing the signals of the optical readout optical paths 6 and 8 and then outputting an infrared thermal image. The invention is mainly characterized in that the optical reference optical paths are added in the optical paths of the uncooled infrared focal plane array imaging system, so that the image acquiring and processing system 9 receives the infrared image signals and light source fluctuation signals simultaneously; and the image acquiring and processing system 9 is used for correcting the infrared image signals by utilizing the light source fluctuation signals, thereby eliminating the influence on the imaging quality of the system caused by light source fluctuation, light source aging and light source power supply ripples and improving the system working reliability.
Description
Technical field
The present invention relates to a kind of un-cooled infrared focal plane array imaging system that contains optical fiber reference light paths, especially a kind of optical fiber reference light paths monitoring light source fluctuation signal that utilizes is in order to revise the un-cooled infrared focal plane array imaging system of infrared image.
Background technology
Infrared thermal imaging technique more and more is subjected to the attention of all trades and professions.For overcoming the influence of problems such as traditional infra-red thermal imaging system cost, volume, weight, power consumption, in recent years, (focal plane array, FPA) thermal imaging system has been subjected to vast research organizations pay much to read the semi-girder focal plane arrays (FPA) that declines based on the light of MOEMS technology.
(focal plane array, FPA) thermal imaging system are to realize infrared light, and---thermo-mechanical deformation---reflective light intensity of irradiation visible light changes---is gone back the process of original image to read the semi-girder focal plane arrays (FPA) that declines based on the light of MOEMS technology.System adopts focal plane array device FPA as infrared image sensor, focal plane array device is a kind of micro cantilever structure, micro-cantilever is made of the material that two kinds of thermal expansivity differ bigger, after micro-cantilever absorbed infrared radiation, the temperature of beam rose, and can reach thermal equilibrium very soon between two material layers, after the thermal equilibrium, because two kinds of material coefficient of thermal expansion coefficient difference are bigger, it is crooked that the stress between them will make beam produce, and amount of bow is directly proportional with the heat that micro-cantilever absorbs.So extraneous temperature field can cause micro-cantilever array to produce corresponding distortion.The detection of micro-cantilever deflection mainly contains electrical readout and light is read dual mode: the former is the situation of change by electrical parameters such as electric capacity that detects the micro-cantilever knee or resistance, obtain the deformation quantity of semi-girder, this method peripherals is fairly simple, but will be on FPA the additional configurations complicated circuit, strengthened the manufacture difficulty of FPA, and the heat of circuit itself can influence the quality of infrared image to a certain extent; Another kind is called light and reads, on each micro-cantilever, small reflector is all arranged, use the radiation of visible light micro-cantilever array, the catoptron of micro-cantilever array can reflect visible light, when the deflection of each micro-cantilever not simultaneously, the catoptron that each micro-cantilever carries also can be different to the reflecting effect of the visible light of irradiation, can obtain the deflection of semi-girder by the variable quantity of detection of reflected light, restore and be infrared image.The peripherals that this method need dispose is than electrical readout complexity, but need not construct sensing circuit on FPA, avoided the influence to image quality of heat that sensing circuit produces.
Just at present domestic and international technical information, light is read the imaging effect that does not reach expection far away.The image-forming principle that research light is read FPA infrared imaging system light path as can be seen, the factor that influences system stability, reliability, sensitivity is a lot, its reason has two aspects, is the restriction of technology, device performance on the one hand, is the overall system design level on the other hand.Further improve light and read un-cooled infrared focal plane array imaging system performance, the important research direction that is.
Summary of the invention
The objective of the invention is to read the problem of un-cooled infrared focal plane array imaging system job stability, reliability and sensitivity at improving light, provide a kind of contain optical fiber reference light paths, can effectively eliminate the influence of light source power ripple, light source ages to the system imaging quality, improve the technology of system works stability, reliability and sensitivity.
The objective of the invention is to realize by following technical scheme:
1. the un-cooled infrared focal plane array imaging system that contains optical fiber reference light paths of the present invention comprises that infrared imaging light path, illumination path, optical read go out light path, optical fiber reference light paths, image acquisition and treating apparatus.The infrared imaging light path comprises infrared imaging camera lens and infrared focal plane array sensor, for imaging provides infrared image; Illumination path comprises light source, collimation lens group and beam splitter group, for imaging system provides visible illumination imaging beam and optical fiber reference illuminating bundle; Optical read goes out light path and comprises some imaging lens groups and wave filter, is used for being carried out filtering, focal imaging by the later visible illumination imaging beam of infrared imaging optical path space modulation, and image imaging is on the CCD target surface of image acquisition and disposal system 9; The reference signal of optical fiber reference light paths in order to provide energy of light source to change; Image acquisition and treating apparatus are exported infrared image after to signal Processing.
2. the imaging characteristics of this system is: at infrared focal plane array device, infrared focal plane array device receives infrared imaging light to the infrared imaging camera lens with extraneous target focal imaging, and its array pixel produces corresponding the variation; The light that sends from light source, expanded after bundle, the collimation, be divided into two bundles again, a branch of directive infrared imaging light path is also entered optical read later on by spatial modulation and goes out light path, image in the CCD surface of image acquisition and disposal system 9, another bundle enters optical fiber through focusing on, and is mapped to the CCD surface of image acquisition and disposal system 9 later on from the optical fiber outgoing.The zone that image acquisition is different with the CCD of disposal system 9 receives the optical fiber reference signal respectively and optical read goes out the signal of light path output.
3. this system is in image processing process, with the optical fiber reference signal infrared image signal is constantly revised, thereby reach the influence of light source power ripple, light source ages, improve the purpose of system works stability, reliability and sensitivity the system imaging quality.
Beneficial effect
Adopt the present invention can realize correction to infrared image, deduction light source power ripple, light source ages, to the influence of system imaging quality improve system works stability, reliability and sensitivity.Than non-refrigerating infrared focal plane imaging system in the early time, under equal conditions, its imaging performance is improved, and environment for use requirement, system device are required also corresponding reduction.
Description of drawings
Fig. 1 is that general light is read non-refrigerating infrared focal plane imaging system synoptic diagram;
Fig. 2 is the non-refrigerating infrared focal plane imaging system synoptic diagram that contains optical fiber reference light paths of the present invention;
Wherein, description of reference numerals is as follows: 1. infrared imaging lens group among the figure; 2. infrared focal plane array; 3. light source; 4. collimation lens group; 5. spectroscope group; 6. optical read goes out light path; 7. focus lamp group; 8. optical fiber; 9. image acquisition and treating apparatus.
Embodiment
To describe specific embodiments of the invention in detail below.
1. system forms
The non-refrigerating infrared focal plane imaging system that contains optical fiber reference light paths of the present invention goes out light path, optical fiber reference light paths and image acquisition and treating apparatus is formed by infrared imaging light path, illumination path, optical read, specifically as shown in Figure 2:
Infrared imaging optical routing infrared imaging lens group 1 and infrared focal plane array 2 are formed, and on 7,7 pixel array produces the variation of rule to infrared lens with extraneous heat picture focal imaging;
Illumination path comprises light source 3, light source collimation lens group 4 and spectroscope group 5 is formed, and illumination path provides visible, non-interference, parallel illumination imaging beam for total system;
Optical read goes out light path 6 and comprises some imaging lens and wave filter, is used for being modulated later visible illumination imaging beam focal imaging in the CCD surface of image acquisition and disposal system 9 by infrared focal plane array 3;
Optical fiber reference light paths comprises focus lamp group 7 and optical fiber 8, is used for visible illuminating bundle is focused on, and is delivered to the CCD surface of image acquisition and disposal system 9;
Image acquisition and treating apparatus 9, the signal that optical read is gone out light path output is handled according to certain rules, and the output thermal-induced imagery.
2. imaging process
The non-refrigerating infrared focal plane imaging system that contains optical fiber reference light paths of the present invention, its imaging process be as shown in Figure 2:
Extraneous target infrared heat picture enters the non-refrigeration twin-beam light that contains optical fiber reference light paths of the present invention by infrared lens 1 and reads the non-refrigerating infrared focal plane imaging system, image in (shown in the arrow I) on the focal plane arrays (FPA) 2, focal plane arrays (FPA) 2 is owing to absorbed heat, and the catoptron of pixel array can deflect under the drive of semi-girder.
The diverging light that light source 3 sends, collimated lens group 4 expands after bundle, the collimation, enter beam splitter group 5 (shown in the arrow II), be divided into two bundles from the light of beam splitter group outgoing: a branch of infrared imaging light path (shown in the arrow III) of injecting, by the later illumination imaging beam of focal plane arrays (FPA) 2 modulation, enter optical read and go out light path 6 (shown in the arrow IV), optical read goes out light path it is imaged on the CCD target surface of information acquisition and treating apparatus 9; Enter optical fiber 8 (shown in the arrow V) after another bundle line focus mirror group 7 is assembled, inject the CCD target surface of information acquisition and treating apparatus 9 from the light beam of optical fiber 8 outgoing.CCD target surface zones of different receives respectively through the illumination imaging beam of extraneous thermal image modulation with from the reference beam of optical fiber.
3. with background and system noise signal correction infrared image
The non-refrigerating infrared focal plane imaging system that contains optical fiber reference light paths of the present invention is as follows with the signal correction infrared image of optical fiber reference light paths:
(1) infrared image obtains
The infrared image acquisition process that light shown in the accompanying drawing 1 is read the non-refrigerating infrared focal plane imaging system is:
At first system is to the reference substance imaging, and acquiescence external environment this moment does not have influence to the pixel of focal plane arrays (FPA) 2, and then image acquisition and treating apparatus 9 each pixel obtain an ENERGY E
0System's infrared object imaging to external world then, external image is imaged on the focal plane arrays (FPA) 2 by infrared lens group 1, makes the pixel of focal plane arrays (FPA) 2 produce corresponding angular deflection, causes the ENERGY E of each pixel acquisition of image acquisition and treating apparatus 9
iWith E
0Produce difference, the difference of the two is a thermal-induced imagery, that is:
Thermal-induced imagery E
I0=E
0-E
i... ... ... ... ... (1)
Wherein: E
0=E η
1η
2η
0... ... ... ... ... (2)
E
i＝E·η
1·η
2·η ...........................(3)
E is the luminous intensity of light source 2, η
1Be the light transmission efficiency of light source collimation lens group 4, η
2For reading the light transmission efficiency of light path 6, η
0Be the light transmission efficiency of focal plane arrays (FPA) 2, η is the light transmission efficiency of system to focal plane arrays (FPA) 2 after the infrared object imaging;
In fact, the E in formula (2) and the formula (3) can change with light source ages, light source power ripple,
Thereby cause the result of calculation distortion of formula (1).
(2) the signal correction infrared image of optical fiber reference light paths
The non-refrigerating infrared focal plane imaging system that contains optical fiber reference light paths shown in Figure 2 has increased a beam splitter group 5 on the basis of Fig. 1, a certain proportion of luminous energy of intercepting from the illumination imaging beam, the variation of monitoring light source emitted energy.Image acquisition and treating apparatus 9 subregions receive the signal Eg of infrared image Es and optical fiber reference light paths, if according to:
Result calculated output infrared image, then can overcome to a great extent because E changes the difficulty of the image fault that causes in time, that is to say that this imaging system can deduct the influence to the system imaging quality of light source power ripple, light source ages preferably, improve system works stability, reliability and sensitivity.
Claims (5)
1. un-cooled infrared focal plane array imaging system that contains optical fiber reference light paths, comprise the infrared imaging light path, illumination path, optical read goes out light path, optical fiber reference light paths, image acquisition and disposal system, it is characterized in that optical fiber reference light paths monitors the fluctuation of lighting source, and light source fluctuation information offered image acquisition and treating apparatus, when Flame Image Process, utilize this monitor message that infrared image is revised, thereby elimination light source fluctuation, light source ages, the light source power ripple improves the imaging system functional reliability to the influence of system imaging quality.
2. the un-cooled infrared focal plane array imaging system that contains optical fiber reference light paths according to claim 1, it is characterized in that the infrared imaging light path comprises infrared imaging camera lens and infrared focal plane array, illumination path comprises light source, collimating mirror group, spectrum groupware, optical read goes out light path and comprises imaging lens group and wave filter, and optical fiber reference light paths comprises condenser group and optical fiber.
3. the un-cooled infrared focal plane array imaging system that contains optical fiber reference light paths according to claim 1, after it is characterized in that described illuminating bundle is divided into two bundles, a branch of directive infrared focal plane array, after the infrared focal plane array modulation through having extraneous infrared image, go out light path by optical read again, image in image acquisition and disposal system; Another bundle is focused on by the condenser group and enters optical fiber reference light paths, images in image acquisition and disposal system.
4. the non-refrigerating infrared focal plane imaging system that contains optical fiber reference light paths according to claim 3 is characterized in that the CCD subregion in image acquisition and the treating apparatus gathers the light source fluctuation signal of infrared image signal and optical fiber monitoring.
5. according to claim 3 and the 4 described non-refrigerating infrared focal plane imaging systems that contain optical fiber reference light paths, it is characterized in that image acquisition and treating apparatus utilize the light source fluctuation signal of optical fiber monitoring, infrared image signal is revised, to eliminate the influence of light source fluctuation, light source ages, light source power ripple, improve the imaging system functional reliability to the system imaging quality.
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| CN110307905A (en) * | 2019-07-15 | 2019-10-08 | 电子科技大学 | A kind of infrared focal plane array and the infra-red thermal imaging system based on the infrared focal plane array |
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Application publication date: 20111123 |