JPH01155220A - Infrared optical system - Google Patents
Infrared optical systemInfo
- Publication number
- JPH01155220A JPH01155220A JP62316926A JP31692687A JPH01155220A JP H01155220 A JPH01155220 A JP H01155220A JP 62316926 A JP62316926 A JP 62316926A JP 31692687 A JP31692687 A JP 31692687A JP H01155220 A JPH01155220 A JP H01155220A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- light
- housing
- mirror
- infrared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 230000031700 light absorption Effects 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 238000003331 infrared imaging Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
赤外線映像装置の赤外線光学系の改造に関し、感度低下
や構造上の性能劣化を発生させることなく、赤外線光学
系のハウジング内面から放射される赤外線の検知素子へ
の入射を防止することができる赤外線光学系を提供する
ことを目的とし、赤外線を受光する端面にレンズを有す
るハウジングと、該ハウジングの他端面にウィンドを有
し、その内部にコールドシールドと検知素子を備えた検
知器容器を収納した赤外線装置において、前記レンズと
検知器容器間のハウジング内の所定位置に、前記検知器
側が光反射層で形成され、前記レンズ側が凸面で光吸収
層で形成され、かつ中心光軸上に前記レンズの収束赤外
線光のみを通過する開口絞りを有する鏡を備えて構成す
る。[Detailed Description of the Invention] [Summary] An element for detecting infrared rays emitted from the inner surface of the housing of the infrared optical system without causing a decrease in sensitivity or structural performance deterioration in the modification of the infrared optical system of an infrared imaging device. The purpose of the present invention is to provide an infrared optical system that can prevent infrared rays from entering the infrared rays. In an infrared device housing a detector container including an element, the detector side is formed of a light reflecting layer and the lens side is convex and formed of a light absorption layer at a predetermined position in the housing between the lens and the detector container. and a mirror having an aperture diaphragm on the central optical axis that allows only the convergent infrared light from the lens to pass through.
本発明は赤外線映像装置の赤外線光学系に関するもので
ある。The present invention relates to an infrared optical system for an infrared imaging device.
赤外線映像装置の光学系においてはレンズ等の光学エレ
メントを固定するハウジングからハウジング温度に依存
した赤外線が放射される。この放射赤外線が検知器に入
射するとハウジング温度の変動によって検知器出力が変
動することになり、赤外線装置の映像品質が劣化する。In the optical system of an infrared imaging device, infrared rays depending on the housing temperature are emitted from a housing that fixes optical elements such as lenses. When this radiated infrared rays enters the detector, the output of the detector will fluctuate due to fluctuations in the housing temperature, and the image quality of the infrared device will deteriorate.
そこでハウジングからの放射赤外線が検知器に入射する
ことを防止することができる光学系が要求されている。Therefore, there is a need for an optical system that can prevent the infrared rays radiated from the housing from entering the detector.
第３図は従来の赤外線装置の模式図を示しており、レン
ズ１等の光学エレメントを固定する円筒状のハウジング
２と、検知素子３や該検知素子３を冷却する冷却器４お
よび検知素子４への入射光を規制するコールドシールド
５等を収納する円筒状で内部が真空状態に形成された検
知器容器６とより構成されている。FIG. 3 shows a schematic diagram of a conventional infrared device, which includes a cylindrical housing 2 that fixes an optical element such as a lens 1, a sensing element 3, a cooler 4 that cools the sensing element 3, and the sensing element 4. It consists of a cylindrical detector container 6 which houses a cold shield 5 etc. that regulates incident light to the detector container 6 and is formed in a vacuum state inside.
またコールドシールド５および検知器容器６の前面部に
は光通過孔８およびウィンドウ７が設けられ、レンズｌ
とハウジング２と検知器容器６とコールドシールド５と
検知素子４の中心部がレンズ１の中心光軸上に直列状に
配設されている。Further, a light passage hole 8 and a window 7 are provided in the front part of the cold shield 5 and the detector container 6, and a lens l
The housing 2, the detector container 6, the cold shield 5, and the center of the sensing element 4 are arranged in series on the central optical axis of the lens 1.
目標物体からの赤外線光Ａ（実線で示す）はレンズ１で
収束され、ウィンド７を通って検知器容器６内に至り、
更にコールドシールド５の光通過孔８を通って検知素子
３に入射して検知される。Infrared light A (shown by a solid line) from the target object is converged by a lens 1, passes through a window 7, and enters the detector container 6.
Further, the light passes through the light passage hole 8 of the cold shield 5 and enters the detection element 3 and is detected.
検知素子３は入射赤外光をアナログ電気信号に変換し、
図示しない画像処理装置を介して表示器で目標物体の赤
外画像を表示する。The detection element 3 converts the incident infrared light into an analog electrical signal,
An infrared image of the target object is displayed on a display via an image processing device (not shown).
上記の赤外線光学装置においては、第３図の点線Ｂで示
すように、ハウジング２の内壁からハウジング温度に依
存した赤外線が放射される。この放射赤外線Ｂが検知素
子３に入射するとハウジング温度の変動によって検知素
子３の出力が変動することになり、赤外線装置の映像品
質が劣化する。In the above-mentioned infrared optical device, infrared rays are emitted from the inner wall of the housing 2 depending on the housing temperature, as indicated by the dotted line B in FIG. When this radiated infrared ray B enters the sensing element 3, the output of the sensing element 3 will change due to fluctuations in the housing temperature, and the image quality of the infrared device will deteriorate.
そこでこの問題に対処するため、第４図に示す光学系に
おいては、
コールドシールド開口径ｄの許容ｄｍａには、ｄｍａｘ
＝ｈ／ｆ （Ｄｏ ＋ｊり −１−・１１）有効開
口径 Ｄｅ ＝ ｆ ／ ｈ Ｘｄｍａｘ ・・（
２）ＤｅとＤＯの比は次式となる。Therefore, in order to deal with this problem, in the optical system shown in Fig. 4, the allowable dmax of the cold shield aperture diameter d is dmax
=h/f (Do +jri -1-・11) Effective opening diameter De = f/h Xdmax...(
2) The ratio of De and DO is as follows.
Ｄｅ／ＤＯ＝１−１／Ｄｏ （ｆ／ｈ １）
・ ・（３）となり、コールドシールド５の開口径ｄを
小さくするか又は、コールドシールド５と検知素子３間
の距離りを大きくすることによってハウジング２からの
赤外線が検知素子３に入射することを防止していた。De/DO=1-1/Do (f/h 1)
・ ・(3) Therefore, by reducing the opening diameter d of the cold shield 5 or increasing the distance between the cold shield 5 and the sensing element 3, it is possible to prevent infrared rays from the housing 2 from entering the sensing element 3. It was being prevented.
この場合、コールドシールド５の開口径ｄを小さくする
と、レンズｌの有効開口径（Ｄｅ ）が小さくなり感度
が低下する。またコールドシールド５と検知素子３間の
距！１１ｔｈを大きくすると検知器熱負荷の増大や耐振
性の低下等があり、構造上の性能劣化が発生する。In this case, if the aperture diameter d of the cold shield 5 is made smaller, the effective aperture diameter (De) of the lens l becomes smaller and the sensitivity is lowered. Also, the distance between the cold shield 5 and the detection element 3! If 11th is increased, the thermal load on the detector increases, vibration resistance decreases, and structural performance deteriorates.
本発明はこのような点に鑑みて創作されたもので、感度
低下や構造上の性能劣化を発生させることなく、赤外線
光学系のハウジング内面から放射される赤外線の検知素
子への入射を防止することができる赤外線光学系を提供
することを目的としている。The present invention was created in view of these points, and prevents infrared rays emitted from the inner surface of the housing of an infrared optical system from entering the detection element without causing a decrease in sensitivity or structural performance deterioration. The purpose is to provide an infrared optical system that can
第１図は本発明の赤外線光学系の原理模式図を示してお
り、一方の端面に赤外線を受光するレンズ１を有するハ
ウジング２と、該ハウジング２の他の一方の端面にウィ
ンド７を有し、その内部にコールドシールド５と検知素
子３を備えた検知器容器６を収納した赤外線装置におい
て、前記レンズ１とウィンド７間のハウジング２内の所
定位置に、前記ウィンド側が凹面で光反射層９で形成さ
れ、前記レンズ側が光吸収層１０で形成され、かつ中心
光軸上に前記レンズｌの収束赤外線光のみ を通過する
開口絞り１１を有する鏡１２を備えた構成としている。FIG. 1 shows a schematic diagram of the principle of the infrared optical system of the present invention, which includes a housing 2 having a lens 1 for receiving infrared rays on one end face, and a window 7 on the other end face of the housing 2. , in an infrared device housing a detector container 6 having a cold shield 5 and a detection element 3 therein, a light reflecting layer 9 is provided at a predetermined position in the housing 2 between the lens 1 and the window 7 and has a concave surface on the window side. The mirror 12 is formed of a light absorbing layer 10 on the lens side and has an aperture stop 11 on the central optical axis that allows only the convergent infrared light from the lens I to pass through.
鏡１２の開口絞り１１はレンズ１で収束された全ての赤
外線光束のみを通過させる。開口絞り１１を通過した赤
外線光ａはウィンド７と光通過孔８を通って検知素子３
で検知される。The aperture stop 11 of the mirror 12 allows only all the infrared light beams converged by the lens 1 to pass through. The infrared light a that has passed through the aperture stop 11 passes through the window 7 and the light passage hole 8 and reaches the detection element 3.
detected.
この開口絞り１１は検知器容器６内のコールドシールド
５に比較して光学系入射開口面（レンズ１）に対しより
近くに設置できるために光学系有効開口径を拡大でき、
赤外線装置の感度を向上するようにしている。Since this aperture stop 11 can be installed closer to the optical system entrance aperture surface (lens 1) than the cold shield 5 in the detector container 6, the effective aperture diameter of the optical system can be expanded.
We are trying to improve the sensitivity of infrared devices.
一方、レンズ１と鏡１２間のハウジング２の内面から放
射した赤外線光の大部分は球面鏡１２の光吸収層ＩＯで
吸収される。On the other hand, most of the infrared light emitted from the inner surface of the housing 2 between the lens 1 and the mirror 12 is absorbed by the light absorption layer IO of the spherical mirror 12.
また鏡１２とコールドシールド５間に存在する部品から
放射される赤外線光すは全て鏡１２の凹面に形成された
光反射層９によって検知素子３に入射しない角度で反射
され、コールドシールド５内への入射をなくしてハウジ
ング内部からの赤外線光学系こよる影響をなくしている
。In addition, all infrared light emitted from parts existing between the mirror 12 and the cold shield 5 is reflected by the light reflection layer 9 formed on the concave surface of the mirror 12 at an angle that does not enter the detection element 3, and is reflected into the cold shield 5. This eliminates the influence of the infrared optical system from inside the housing.
また凹面鏡１２−１とランド７との間のハウジング内面
から放射する赤外線Ｃはコールドシールド５の光通過孔
８の遮断効果によって検知素子３に入射しないようにし
ている。Further, infrared rays C emitted from the inner surface of the housing between the concave mirror 12-1 and the land 7 are prevented from entering the detection element 3 by the blocking effect of the light passage hole 8 of the cold shield 5.
第２図は本発明の一実施例の赤外線光学系の側面図を示
しており、筒状をなすハウジング２の一端部にレンズ１
が設けられ、他の一端部にはレンズ側が平面で他の一端
側が凹面を形成した凹面鏡１２−１と凹面鏡１２−２を
設けている。また、凹面鏡１２−１の凹面は反射率の高
い材料による光反射層９が形成され、凹面鏡１２−２の
一方の面は完全黒体による光吸収層１０が形成されてい
るとともに、レンズｌで収束された赤外線光束を通過す
る開口絞り１１−２および１１−１を備えている。FIG. 2 shows a side view of an infrared optical system according to an embodiment of the present invention, in which a lens 1 is attached to one end of a cylindrical housing 2.
A concave mirror 12-1 and a concave mirror 12-2, each having a flat surface on the lens side and a concave surface on the other end, are provided at the other end. Further, the concave surface of the concave mirror 12-1 is formed with a light reflection layer 9 made of a material with high reflectance, and one surface of the concave mirror 12-2 is formed with a light absorption layer 10 made of a completely black body, and a lens l is formed on one surface of the concave mirror 12-1. It is provided with aperture stops 11-2 and 11-1 that pass the converged infrared light beam.
また、前記ハウジングの他の一端部にはコールドシール
ド５と検知素子３を収納する検知器容器６が設けられた
構造をなしている。Furthermore, the other end of the housing is provided with a detector container 6 that accommodates the cold shield 5 and the detection element 3.
目標物体から放射された赤外線光Ａはレンズ１で収束さ
れる。この収束された赤外線光は凹面鏡１２−２と凹面
鏡１２−１の開口絞り１１−２と１１−１内を通過し、
更に検知器容器６のウィンド７とコールドシールド５の
光通過孔８を通って検知素子３に入射する。検知素子３
は入射赤外光をアナログ電気信号に変換し、図示しない
画像処理装置を介して表示器で目標物体の赤外画像を表
示する。Infrared light A emitted from a target object is converged by a lens 1. This converged infrared light passes through the concave mirror 12-2 and the aperture stops 11-2 and 11-1 of the concave mirror 12-1,
Further, the light passes through the window 7 of the detector container 6 and the light passage hole 8 of the cold shield 5 and enters the detection element 3 . Detection element 3
converts incident infrared light into an analog electrical signal, and displays an infrared image of the target object on a display via an image processing device (not shown).
なお、凹面鏡１２−２および凹面鏡１２−１の開口絞り
１１−２および１１−１はレンズｌで収束された赤外線
光束のみを通過させる。Note that the concave mirror 12-2 and the aperture stops 11-2 and 11-1 of the concave mirror 12-1 allow only the infrared light beam converged by the lens l to pass through.
また凹面鏡１２−２は完全黒体で形成された光吸収層ｌ
Ｏによって凹面鏡１２−２とレンズ１間のハウジング内
部から放射される赤外線Ｂを全て吸収する。凹面鏡１１
−１は凹面部に高反射率の材料で形成された反射層９に
よって凹面鏡１１−１と検知素子３間のコールドシール
ド以外の部品から放射される点線Ｃで示す全ての赤外線
光を検知素子３面に入射しない方向に反射し、赤外線光
Ｃが検知素子３に入射しないようにする。これによって
ハウジング内部や検知器容器内等から放射される赤外線
光が検知素子に入射することを完全に防止している。Further, the concave mirror 12-2 has a light absorption layer l formed of a completely black body.
O absorbs all the infrared rays B emitted from inside the housing between the concave mirror 12-2 and the lens 1. Concave mirror 11
-1 is a reflective layer 9 formed on the concave surface of a material with high reflectance, which allows all infrared light shown by the dotted line C emitted from components other than the cold shield between the concave mirror 11-1 and the detection element 3 to be transmitted to the detection element 3. The infrared light C is reflected in a direction that does not enter the surface to prevent the infrared light C from entering the detection element 3. This completely prevents infrared light emitted from inside the housing, inside the detector container, etc. from entering the sensing element.
同時に凹面鏡１１−１．１１−２の高反射率の面は、そ
の赤外線放射率が小さいため、該高反射率面から検知素
子に入射する赤外線Ｄｄは極めて小さいものとなる。At the same time, since the high-reflectance surfaces of the concave mirrors 11-1 and 11-2 have low infrared emissivity, the infrared rays Dd that enter the detection element from the high-reflectance surfaces are extremely small.
また、凹面鏡１１−２と凹面鏡１１−１を組合わせたこ
とにより、その開口絞りは検知器官Ｂ６内のコールドシ
ールド５に比較して光学系入射開口面（レンズ１）によ
り近くに設置できるため、光学系有効開口径を拡大でき
て赤外線装置感度を向上することができる。Furthermore, by combining the concave mirror 11-2 and the concave mirror 11-1, the aperture stop can be installed closer to the optical system entrance aperture surface (lens 1) than the cold shield 5 in the detection organ B6. The effective aperture diameter of the optical system can be expanded and the sensitivity of the infrared device can be improved.
以上説明したように本発明によれば、ハウジング内面か
らの放射赤外線の検知素子への入射量を大幅に低減する
ことができる。As explained above, according to the present invention, it is possible to significantly reduce the amount of infrared rays radiated from the inner surface of the housing incident on the detection element.
第１図は本発明の赤外線光学系の原理模式図、第２図は
一実施例の赤外線光学系の側面図、第３図は従来の赤外
線光学系の模式図、第４図は従来の赤外線光学系の動作
説明図である。
図において、１はレンズ、２はハウジング、３は検知素
子、４は冷却器、５はコールドシールド、６は検知器容
器、７はウィンド、８は光通過孔、９は光反射層、１０
は光吸収層、１１．１ｌ−Ｌｌｌ−２は開口絞り、１２
は鏡、１２−１ 、１２−２は凹面鏡を示している。Fig. 1 is a schematic diagram of the principle of an infrared optical system of the present invention, Fig. 2 is a side view of an infrared optical system of an embodiment, Fig. 3 is a schematic diagram of a conventional infrared optical system, and Fig. 4 is a schematic diagram of a conventional infrared optical system. FIG. 3 is an explanatory diagram of the operation of the optical system. In the figure, 1 is a lens, 2 is a housing, 3 is a detection element, 4 is a cooler, 5 is a cold shield, 6 is a detector container, 7 is a window, 8 is a light passage hole, 9 is a light reflection layer, 10
is a light absorption layer, 11.1l-Lll-2 is an aperture stop, 12
indicates a mirror, and 12-1 and 12-2 indicate concave mirrors.
Claims (1)
グ（２）と、該ハウジングの他端面にウインド（７）を
有し、その内部にコールドシールド（５）と検知素子（
３）を備えた検知器容器（６）を収納した赤外線装置に
おいて、 前記レンズと検知器容器間のハウジング内の所定位置に
、前記検知器側が凹面で光反射層（９）で形成され、前
記レンズ側が光吸収層（１０）で形成され、かつ中心光
軸上に前記レンズの収束赤外線光のみを通過する開口絞
り（１１）を有する鏡（１２）を備えたことを特徴とす
る赤外線光学系。[Claims] A housing (2) having a lens (1) on an end face that receives infrared rays, a window (7) on the other end face of the housing, and a cold shield (5) and a detection element (
3), an infrared device housing a detector container (6) comprising: a light reflecting layer (9) with a concave surface on the detector side formed at a predetermined position in the housing between the lens and the detector container; An infrared optical system comprising a mirror (12) whose lens side is formed of a light absorption layer (10) and which has an aperture stop (11) on the central optical axis that passes only the converged infrared light of the lens. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62316926A JPH01155220A (en) | 1987-12-14 | 1987-12-14 | Infrared optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62316926A JPH01155220A (en) | 1987-12-14 | 1987-12-14 | Infrared optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01155220A true JPH01155220A (en) | 1989-06-19 |
Family
ID=18082460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62316926A Pending JPH01155220A (en) | 1987-12-14 | 1987-12-14 | Infrared optical system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01155220A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0723141A1 (en) * | 1995-01-17 | 1996-07-24 | Applied Materials, Inc. | Sensors for measuring temperature and methods of measuring workpiece temperatures |
| JP2014225829A (en) * | 2013-05-17 | 2014-12-04 | 株式会社アピステ | Structure of optical system for infrared camera |
| CN111238659A (en) * | 2020-01-20 | 2020-06-05 | 武汉高芯科技有限公司 | Cold screen and refrigeration type infrared detector with stray light inhibiting function |
-
1987
- 1987-12-14 JP JP62316926A patent/JPH01155220A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0723141A1 (en) * | 1995-01-17 | 1996-07-24 | Applied Materials, Inc. | Sensors for measuring temperature and methods of measuring workpiece temperatures |
| US5716133A (en) * | 1995-01-17 | 1998-02-10 | Applied Komatsu Technology, Inc. | Shielded heat sensor for measuring temperature |
| JP2014225829A (en) * | 2013-05-17 | 2014-12-04 | 株式会社アピステ | Structure of optical system for infrared camera |
| CN111238659A (en) * | 2020-01-20 | 2020-06-05 | 武汉高芯科技有限公司 | Cold screen and refrigeration type infrared detector with stray light inhibiting function |
| CN111238659B (en) * | 2020-01-20 | 2021-09-07 | 武汉高芯科技有限公司 | Cold screen and refrigeration type infrared detector with stray light inhibiting function |
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