CN2879145Y

CN2879145Y - Light path interfering plate for improving non-uniformity correcting effect of staring type infrared thermal image instrument

Info

Publication number: CN2879145Y
Application number: CN 200620019305
Authority: CN
Inventors: 刘传明; 陈吕吉; 吴诚; 吴晓飚; 郑传武; 许光义
Original assignee: Kunming Institute of Physics
Current assignee: Kunming Institute of Physics
Priority date: 2006-02-24
Filing date: 2006-02-24
Publication date: 2007-03-14
Anticipated expiration: 2016-02-24

Abstract

This device is an optical interference board that improves uneven rectification of the gaze type infrared thermal camera, which is characterized in that the optical interference board is embedded into a hollow butt of the interference board bracket, and the other end of the jamming board bracket, as a movable mechanism, is connected with motor mechanism, thereby completing the action of fast cut-in/cut-out of the optical interference board. The optical interference board is made of the materials permeable for infrared of 8 mu m to 14 mu m wavelength, and of certain roughness on both sides, and the used materials can be germanium, vulcanized zinc or zinc-selenite. The utility model has fundamentally resolved the difficulty of the difference in temperature between the reference black body and the background of the target, enhanced efficiently the uneven rectification image quality and the performance of the infrared thermal camera and met the rigor requirements on the image of various kinds of application.

Description

Improve the light path of gazing type thermal infrared imager Nonuniformity Correction effect and disturb plate

One, technical field

The utility model belongs to the technology of gazing type focal plane thermal infrared imager, is the building block of a kind of gazing type focal plane thermal infrared imager.

Two, background technology

Gazing type focal plane thermal infrared imager is owing to the reason on the manufacturing process, all has fixing heterogeneity noise, this heterogeneity shows as and has fixing irregular light and shade shading on the image, this shading that image exists has strong interference to human eye, handle if do not carry out the later stage Nonuniformity Correction, even can cause the infrared system can't operate as normal.The method that generally addresses this problem be in machine, use one movably reference blackbody with the light path temporarily shielding as correction reference, to the collection of the corresponding signal of detector and calculate and to obtain corresponding corrected parameter, adopt this parameter to address this problem substantially by circuit.But because the reference blackbody that adopts often has bigger difference with the equivalent blackbody temperature of the observed image of reality, use above method can not obtain best correction parameter matrix, and cause the Nonuniformity Correction effect relatively poor, requiring high slightly occasion often can not satisfy request for utilization.

Three, utility model content

Defective at the technique scheme existence, the utility model proposes a kind of light path of improving gazing type thermal infrared imager Nonuniformity Correction effect and disturb plate, it fundamentally solves the reference blackbody of timing employing and the difficult problem that the target background temperature has the temperature difference and the picture quality that effectively strengthens nonuniformity correction, improve the performance of thermal infrared imager, satisfy the harsh requirement of various application image.

The light path of improving gazing type thermal infrared imager Nonuniformity Correction effect that the utility model proposes is disturbed plate, it is characterized in that: light path disturbs plate to embed the hollow position of major part of disturbing board mount one end, the interference board mount other end as movable device connects with electric motor mechanism, finishes and disturbs plate to cut/cut out the action of light path fast light path.

Detailed step is as follows:

(1) disturb plate to adopt long-wave infrared to 8um～14um wavelength good diactinic material to be arranged, two-sidedly have certain roughness, the reference blackbody that replaces conventional method to use, but described material germanium, zinc sulphide or zinc selenide,

(2) response of measurement detector,

(3) according to the explorer response data computation correction coefficient that measures,

(4) carry out the Nonuniformity Correction of successive image according to the correction coefficient that calculates.

The utility model proves by practical application: image adopted the thermal imaging system of common reference blackbody scheme to be significantly improved relatively originally, and effect is especially obvious under rugged surroundings.Adopted the image effect of the gazing type thermal infrared imager that disturbs the plate scheme that obvious improvement arranged, operating distance has had and has significantly improved.

Four, description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is done to describe in further detail.

Fig. 1 is a light path arrangement conceptual scheme of the present utility model.

Fig. 2 is the synoptic diagram that light path of the present utility model is disturbed plate.

Fig. 3 is an interference board component synoptic diagram of the present utility model.

Five, embodiment

With reference to Fig. 1, be basic embodiment of the present utility model: form by infrared optics imaging lens group 1, interference plate 2, gazing type focal plane infrared eye window 3, gazing type focal plane infrared eye focal plane 4.

Disturb plate specific implementation structure: disturb front elevation such as Fig. 3 of plate 2 to show, it is the design of a similar table tennis racket, the interference plate optics that the major part of interference board mount 5 partly hollows out and will be processed by design proposal shown in Figure 2 embeds as movable device, by actuating unit on the plate end that disturbs board mount such as motor etc., can finish and to disturb plate to cut/cut out the action of light path fast.

The specific implementation step:

(1) when needs carries out parameter correction, to disturb plate to cut fast between infrared system optical imagery lens group 1 and the gazing type infrared focal plane detector window 3, the infrared energy of the target image that the outside is observed is by disturbing the effect of plate, becomes uniform infrared energy during infrared gazing type focus planardetector focal plane 4.

(2) will this even infrared radiation as even equivalent blackbody radiation near target temperature, emittance is read by the infrared sensing circuit of staring focus planardetector and is carried out the digital-to-analog conversion sampling and the data that obtain are stored accordingly by subsequent process circuit.

(3) the Nonuniformity Correction parameter of by the Digital Image Processing circuit data that obtain being carried out the calculating of correction parameter and obtaining optimizing at object observing.

(4) will disturb plate to cut out fast, the signal that the correction parameter that adopts previous step to obtain obtains detector carries out the image after Nonuniformity Correction can obtain proofreading and correct.

The key that this system realizes, the reference blackbody that has been to adopt the interference plate of the material of transmission long-wave infrared to replace conventional method to adopt.The equivalent temperature of the reference blackbody that conventional method adopts can't be approaching with the ambient temperature of target being observed at any time, often differs very big in abominable occasion; Use the interference plate to cooperate infrared optics imaging lens group that scattering is carried out in target emanation and obtain the reference blackbody of the equivalent reference blackbody of target background temperature radiation thus, improved the adaptability of environment for use greatly as system compensation.Use this to disturb plate to cooperate electronic processing system effectively to reach the system compensation parameter is revised fast at actual application environment, to obtain the purpose of optimized image effect.

With reference to Fig. 2, disturb the sheet material material can use the material of transmission long-wave infrared such as monocrystalline germanium etc.

With reference to Fig. 3, the correction plate structure not only can be designed as the table tennis racket style, can also be designed to other styles such as slide rail, can will disturb plate to cut light path and the function that cuts out light path fast and accurately reliably as long as reach.

The utility model adopts the method for outer scene as radiation source owing to discarded the thinking of blocking light path, the adaptability of environment is strengthened and effectively raises the picture quality of infrared gazing type thermal imaging system greatly.Can be applied in the implementation of most gazing type thermal infrared imagers.

Claims

1, the light path of improving gazing type thermal infrared imager Nonuniformity Correction effect is disturbed plate, it is characterized in that: disturb plate to embed the hollow position of major part of disturbing board mount one end, connect with electric motor mechanism as the interference board mount other end of movable device.

2, the light path of improving gazing type thermal infrared imager Nonuniformity Correction effect according to claim 1 is disturbed plate, it is characterized in that: disturb plate to adopt long-wave infrared to 8um～14um wavelength good diactinic material to be arranged, two-sidedly have certain roughness, but described material germanium, zinc sulphide or zinc selenide.