JP2010008092A - Infrared imaging apparatus and infrared imaging method - Google Patents
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本発明は、監視領域内の物体を検知し、その画像を生成する赤外線撮像装置および赤外線撮像方法に関する。 The present invention relates to an infrared imaging device and an infrared imaging method for detecting an object in a monitoring area and generating an image thereof.
監視領域内の物体を検知するための装置としては、物体から放出される赤外線を受光し、その赤外線の解析によって画像データを生成する赤外線検知器が知られている（例えば、特許文献１参照）。この赤外線検知器は、物体から放出される可視光線や近赤外線が僅かであっても、これを増幅して明瞭な画像が得られるので、夜間利用も可能な利点がある。 As an apparatus for detecting an object in a monitoring region, an infrared detector that receives infrared rays emitted from an object and generates image data by analyzing the infrared rays is known (for example, see Patent Document 1). . This infrared detector has an advantage that it can be used at night because it can amplify a clear image and obtain a clear image even if a small amount of visible light or near infrared light is emitted from an object.
また、監視領域内にレーザ光（赤外光など）を照射し、その反射光を受光して監視領域における対象物の有無、対象物までの距離、および対象物の画像データを生成するレーザレーダ装置が知られている（例えば特許文献２参照）。このレーザレーダ装置は、雨天、濃霧、夜間などの悪条件下でも遠距離にある物体の画像監視が可能な利点がある。
しかしながら、赤外線検知器は、夜間利用可能であるが、対象物までの距離が不明であるため、複雑な背景下での利用に制約がある。一方、レーザレーダ装置では、指定距離の画像のみが取得されるため、監視領域内の全体像を把握することが困難であるという問題があった。 However, although the infrared detector can be used at night, since the distance to the object is unknown, there are restrictions on the use under a complicated background. On the other hand, the laser radar device has a problem that it is difficult to grasp the entire image in the monitoring area because only an image at a specified distance is acquired.
そこで、本発明は、従来技術の問題に鑑み、監視領域内の全体像を把握でき、かつ、所望の距離に存在する対象物の画像を選択的に撮像可能な赤外線撮像装置および赤外線撮像方法を提供することを目的とする。 Therefore, in view of the problems of the prior art, the present invention provides an infrared imaging device and an infrared imaging method capable of grasping an overall image in a monitoring area and selectively imaging an image of an object existing at a desired distance. The purpose is to provide.
本発明に係る赤外線撮像装置は、監視領域内に存在する物体から発せられる赤外線を外表面上に配置された複数の第１の検知素子により受光し、この赤外線を光電変換して電気信号を出力する第１の赤外線検知器と、この第１の赤外線検知器から出力された電気信号を変換し、赤外線受光画像用信号を生成する第１の信号処理器と、前記第１の赤外線検知器の受光対象となる赤外線と異なる波長の赤外パルスレーザ光を生成し、前記監視領域内へ照射するレーザ照射器と、前記赤外パルスレーザ光の照射に連動して、前記外表面において直交する２軸の各方向で前記第１の検知素子に対して交互に配置された複数の第２の検知素子により前記物体からの反射光を逐次受光し、この反射光を光電変換して電気信号を出力する第２の赤外線検知器と、この第２の赤外線検知器から出力された電気信号を変換し、赤外線反射画像用信号を生成する第２の信号処理器と、を備えることを特徴とする。 An infrared imaging device according to the present invention receives infrared rays emitted from an object existing in a monitoring area by a plurality of first detection elements arranged on an outer surface, and photoelectrically converts the infrared rays to output an electrical signal. A first infrared detector, a first signal processor for converting an electrical signal output from the first infrared detector and generating an infrared light receiving image signal, and a first infrared detector. A laser irradiator that generates infrared pulse laser light having a wavelength different from that of the infrared light to be received and irradiates it into the monitoring region, and 2 orthogonal to the outer surface in conjunction with the irradiation of the infrared pulse laser light. The reflected light from the object is sequentially received by a plurality of second sensing elements arranged alternately with respect to the first sensing element in each direction of the axis, and the reflected light is photoelectrically converted to output an electric signal. Second infrared detector The second converts an electrical signal output from the infrared detector, characterized in that it comprises a second signal processing unit for generating a signal for infrared reflection image.
本発明に係る赤外線撮像装置は、監視領域内に存在する物体から発せられる赤外線を受光する第１の検知素子と、この第１の検知素子の受光対象となる赤外線と異なる波長の赤外パルスレーザ光を生成し、前記監視領域内へ照射するレーザ照射器と、前記赤外パルスレーザ光の照射に連動し、前記物体からの反射光を逐次受光する第２の検知素子と、を備え、前記第１および第２の検知素子は、同一面上において直交する２軸の各方向で交互に配置された受光領域を形成し、かつ、前記レーザ照射器のレーザ照射口は、前記受光領域の外周部に配置されることを特徴とする。 An infrared imaging device according to the present invention includes a first detection element that receives infrared rays emitted from an object existing in a monitoring area, and an infrared pulse laser having a wavelength different from that of the infrared light that is received by the first detection element. A laser irradiator that generates light and irradiates the monitoring region; and a second detection element that sequentially receives reflected light from the object in conjunction with irradiation of the infrared pulsed laser light, and The first and second detection elements form light receiving regions alternately arranged in two orthogonal directions on the same plane, and the laser irradiation port of the laser irradiator is an outer periphery of the light receiving region. It is arrange | positioned at the part.
本発明に係る赤外線撮像方法は、監視領域内の物体から発せられる赤外線を受光し、この赤外線を光電変換して電気信号を出力する第１の赤外線受光ステップと、この第１の赤外線受光ステップにおいて出力された電気信号を変換し、赤外線受光画像用信号を生成する第１の信号処理ステップと、前記第１の赤外線受光ステップにおいて受光対象となる赤外線と異なる波長の赤外パルスレーザ光を生成し、前記監視領域内へ照射する赤外レーザ照射ステップと、前記赤外パルスレーザ光の照射に連動して前記物体から前記赤外パルスレーザ光の反射光を逐次受光し、この反射光を光電変換して電気信号を出力する第２の赤外線受光ステップと、この第２の赤外線受光ステップにおいて出力された電気信号を変換し、赤外線反射画像用信号を生成する第２の信号処理ステップと、を有することを特徴とする。 In the infrared imaging method according to the present invention, a first infrared light receiving step of receiving infrared light emitted from an object in a monitoring area, photoelectrically converting the infrared light and outputting an electrical signal, and the first infrared light receiving step A first signal processing step for converting the output electric signal to generate an infrared light receiving image signal, and an infrared pulse laser beam having a wavelength different from that of the infrared light to be received in the first infrared light receiving step. Infrared laser irradiation step for irradiating into the monitoring region, and reflected light of the infrared pulse laser light is sequentially received from the object in conjunction with the irradiation of the infrared pulse laser light, and the reflected light is photoelectrically converted. A second infrared light receiving step for outputting an electric signal and converting the electric signal output in the second infrared light receiving step to generate an infrared reflected image signal. A second signal processing step of, characterized by having a.
本発明によれば、監視領域内の全体像を把握でき、かつ、所望の距離に存在する対象物の画像を選択的に撮像可能な赤外線撮像装置および赤外線撮像方法が提供される。 ADVANTAGE OF THE INVENTION According to this invention, the infrared imaging device and infrared imaging method which can grasp | ascertain the whole image in a monitoring area | region and can selectively image the image of the target object which exists in desired distance are provided.
以下、本発明の実施形態について図面を用いて説明する。図１は、本発明の一実施形態に係る赤外線撮像装置１の全体構成例を示す図である。同図に示されるように、赤外線撮像装置１は、制御器１１、レーザ照射器１２、第１の赤外線検知器１３、第２の赤外線検知器１４、信号処理器１５、および画像表示器１６から構成されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an overall configuration example of an infrared imaging device 1 according to an embodiment of the present invention. As shown in the figure, the infrared imaging device 1 includes a controller 11, a laser irradiator 12, a first infrared detector 13, a second infrared detector 14, a signal processor 15, and an image display 16. It is configured.
制御器１１は、赤外線撮像装置１を構成する各機器を制御する中央処理装置である。レーザ照射器１２は、レーザ発生器１２Ａ、照射方向制御器１２Ｂ、および冷却器１２Ｃから構成され、レーザ光を所望の方向へ照射する装置である。レーザ発生器１２Ａは、制御器１１からの制御情報に基づいてレーザ光を生成し、照射方向制御器１２Ｂで定められた方向へ照射する。 The controller 11 is a central processing unit that controls each device constituting the infrared imaging device 1. The laser irradiator 12 is composed of a laser generator 12A, an irradiation direction controller 12B, and a cooler 12C, and irradiates laser light in a desired direction. The laser generator 12A generates laser light based on the control information from the controller 11, and irradiates it in the direction determined by the irradiation direction controller 12B.
ここでは、媒質としてＹＡＧを用い、約１μｍの波長の近赤外線をレーザ光として用い、これを短パルスあるいは超短パルスの赤外パルスレーザ光として照射する。レーザ発生タイミングは、取得画像のフレーム間隔以上とするため、６０Hz以上若しくは１２０Hz以上とすることが好ましい。 Here, YAG is used as a medium, near infrared light having a wavelength of about 1 μm is used as laser light, and this is irradiated as short pulse or ultrashort pulse infrared pulse laser light. The laser generation timing is preferably set to 60 Hz or more or 120 Hz or more in order to set the frame interval of the acquired image or more.
照射方向制御器１２Ｂは、ジンバル機構（図示省略する）を回転駆動させることにより、レーザ発生器１２Ａで生成される赤外パルスレーザ光の照射方向を変更する装置である。冷却器１２Ｃは、レーザ発生器１２Ａにおいて赤外パルスレーザ光の生成の際に生じる熱を冷却する装置である。 The irradiation direction controller 12B is a device that changes the irradiation direction of the infrared pulsed laser light generated by the laser generator 12A by rotationally driving a gimbal mechanism (not shown). The cooler 12C is a device that cools the heat generated when the laser generator 12A generates infrared pulsed laser light.
第１の赤外線検知器１３は、内設された高速シャッター（図示省略する）の開閉動作と複数の検知素子１３１によって監視領域内に存在する物体から発せられる中波長（波長λ１）の赤外線を所定の周期で受光し、この赤外線を光電変換して監視領域の全体像に係る電気信号を出力する。高速シャッターを連続的に開閉することによって監視領域の全体像の時間変化を把握できる。尚、受光する赤外線の波長λ１の帯域は、後述する第２の赤外線検知器１４の受光対象となる波長λ２とは異なっている。波長λ１としては、赤外線の透過率の高い大気の窓を利用するものとし、（１）中波長帯の３〜５μmと（２）長波長帯８〜１２μｍのいずれかとする。 The first infrared detector 13 opens and closes an internal high-speed shutter (not shown) and emits infrared rays having a medium wavelength (wavelength λ 1 ) emitted from an object existing in the monitoring region by a plurality of detection elements 131. Light is received at a predetermined cycle, the infrared light is photoelectrically converted, and an electrical signal relating to the entire image of the monitoring area is output. By continuously opening and closing the high-speed shutter, it is possible to grasp the temporal change of the entire image of the monitoring area. Note that the band of the wavelength λ 1 of the received infrared light is different from the wavelength λ 2 to be received by the second infrared detector 14 described later. As the wavelength λ 1 , an atmospheric window having a high infrared transmittance is used, and (1) one of 3 to 5 μm in the middle wavelength band and (2) one in the long wavelength band 8 to 12 μm.
第２の赤外線検知器１４は、監視領域内の対象物に対してレーザ発生器１２Ａから照射された赤外パルスレーザ光の反射光（波長λ２）を内設された高速シャッター（図示省略する）の開閉動作と複数の検知素子１４１によって所定の周期で受光し、この反射光を光電変換して対象物に係る電気信号を出力する。高速シャッターを連続的に開閉することによって反射光到達時間から対象物までの距離が測定可能である。また、高速シャッターの開閉周期は、後述する生成画像の取得時間に関連するので、第１の赤外線検知器１３と同期させると好適である。尚、第１の赤外線検知器１３と検知対象の波長が重複するのを避けるため、使用波長としては、例えば約１μｍとし、大気の透過率が不足する場合は、照射側で補うことができる。 The second infrared detector 14 is a high-speed shutter (not shown) in which reflected light (wavelength λ 2 ) of the infrared pulse laser light irradiated from the laser generator 12A to the object in the monitoring region is provided. ) And a plurality of detection elements 141, and the reflected light is photoelectrically converted to output an electrical signal related to the object. By continuously opening and closing the high-speed shutter, the distance from the reflected light arrival time to the object can be measured. Moreover, since the opening / closing cycle of the high-speed shutter is related to the generation time of the generated image described later, it is preferable to synchronize with the first infrared detector 13. In addition, in order to avoid the wavelength of the first infrared detector 13 and the detection target from overlapping, the wavelength used is, for example, about 1 μm, and when the atmospheric transmittance is insufficient, it can be compensated on the irradiation side.
信号処理器１５は、第１の信号処理部１５Ａおよび第２の信号処理部１５Ｂから構成され、各赤外線検知器から出力される電気信号の変換処理によって画像用信号を生成し、出力する。第１の信号処理部１５Ａは第１の赤外線検知器１３から出力された電気信号を処理し、受光した赤外線（波長λ１）に係る画像（以下、「赤外線受光画像」という。）用信号を生成する。また、第２の信号処理部１５Ｂは第２の赤外線検知器１４から出力された電気信号を処理し、赤外パルスレーザ光の反射光（波長λ２）に係る画像（以下、「赤外線反射画像」という。）用信号をそれぞれ生成し、出力する。 The signal processor 15 includes a first signal processing unit 15A and a second signal processing unit 15B, and generates and outputs an image signal by conversion processing of an electric signal output from each infrared detector. The first signal processing unit 15A processes the electrical signal output from the first infrared detector 13, and receives a signal for an image (hereinafter referred to as “infrared light reception image”) related to the received infrared light (wavelength λ 1 ). Generate. Further, the second signal processing unit 15B processes the electrical signal output from the second infrared detector 14, and an image related to the reflected light (wavelength λ 2 ) of the infrared pulsed laser light (hereinafter referred to as “infrared reflected image”). ") Is generated and output.
画像表示器１６は、信号処理器１５から出力された画像用信号を制御器１１の制御に基づいて処理し、赤外線受光画像および赤外線反射画像を切り替えて、あるいは並べて表示する装置である。 The image display 16 is a device that processes the image signal output from the signal processor 15 based on the control of the controller 11, and switches or displays the infrared light reception image and the infrared reflection image side by side.
図２は、赤外線撮像装置１の具体例を示す概観図である。ここでは、赤外線撮像装置１の中央部には第１の赤外線検知器１３の単位センサである検知素子１３１および第２の赤外線検知器１４の検知素子１４１が同一の平面においてＸ軸およびＹ軸で交互に位置するように複数組み合わせ、市松状に一体化した受光領域が設けられている。また、第１のレーザ発生器１２Ａおよび第２のレーザ発生器１２Ｂのレーザ照射口は、受光領域の外周部において対角線上で向かい合うように各々設けられている。受光領域において検知素子１３１、１４１を市松状に配置した理由は、異なる波長の赤外線の受光条件を同等とするためであるが、配置方法はこれに限られない。例えば、行単位あるいは列単位で同種の検知素子を配置してもよい。 FIG. 2 is an overview diagram showing a specific example of the infrared imaging device 1. Here, in the central portion of the infrared imaging device 1, the detection element 131 which is a unit sensor of the first infrared detector 13 and the detection element 141 of the second infrared detector 14 are arranged on the same plane in the X axis and the Y axis. A plurality of combined light receiving areas are provided so as to be alternately positioned and integrated in a checkered pattern. Further, the laser irradiation ports of the first laser generator 12A and the second laser generator 12B are provided so as to face each other diagonally at the outer peripheral portion of the light receiving region. The reason why the detection elements 131 and 141 are arranged in a checkered pattern in the light receiving region is to make the light receiving conditions of infrared rays having different wavelengths equal, but the arrangement method is not limited thereto. For example, the same type of detection elements may be arranged in units of rows or columns.
また、第１のレーザ発生器１２Ａおよび第２のレーザ発生器１２Ｂのレーザ照射口は、レーザ照射方向が２種の検知素子の受光方向と平行であるように同一面上に配置されている。したがって、照射方向制御器１２Ｂのジンバル機構（図示省略する）を監視領域に向けて回転駆動させ、赤外パルスレーザの照射方向を変更した場合には、受光領域の傾斜角度も連動して変更される。すなわち、受光領域で反射光を受光し易い構成となっている。また、第１のレーザ発生器１２Ａおよび第２のレーザ発生器１２Ｂのレーザ照射口は四隅ではなく、四辺の中間にそれぞれ配置しても良く、個数も特に限定しない。 The laser irradiation ports of the first laser generator 12A and the second laser generator 12B are arranged on the same plane so that the laser irradiation direction is parallel to the light receiving directions of the two types of detection elements. Therefore, when the gimbal mechanism (not shown) of the irradiation direction controller 12B is rotated toward the monitoring area and the irradiation direction of the infrared pulse laser is changed, the inclination angle of the light receiving area is also changed in conjunction with it. The That is, the reflected light is easily received in the light receiving region. Further, the laser irradiation ports of the first laser generator 12A and the second laser generator 12B may be arranged in the middle of the four sides instead of the four corners, and the number is not particularly limited.
図３は、赤外線撮像装置１により撮像が行われる監視領域の具体例を示す図である。ここでは、赤外パルスレーザ光の照射が行われる領域が監視領域である。この監視領域には、境界面２Ａと境界面２Ｂに囲まれた距離ゲート内を飛翔する飛翔体３の他に、山４Ａ、４Ｂ、４Ｃ、および樹木５Ａ、５Ｂ、５Ｃが存在している。そして、上空を通過する飛翔体３に対して赤外線撮像装置１のレーザ照射器１２から赤外パルスレーザ光が照射され、その反射光を受光する様子が示されている。尚、距離ゲートの幅は高速シャッターの開放時間を変化させることで、例えば１ｋｍ、２ｋｍ、５ｋｍなど任意に設定可能である。また、距離ゲートの数は高速シャッターを開放した回数と等しい。 FIG. 3 is a diagram illustrating a specific example of a monitoring area where imaging is performed by the infrared imaging device 1. Here, a region where irradiation with infrared pulsed laser light is performed is a monitoring region. In this monitoring area, there are mountains 4A, 4B, 4C and trees 5A, 5B, 5C, in addition to the flying object 3 that flies within the distance gate surrounded by the boundary surface 2A and the boundary surface 2B. And the state in which the infrared pulse laser beam is irradiated from the laser irradiator 12 of the infrared imaging device 1 to the flying object 3 passing over the sky and the reflected light is received is shown. The width of the distance gate can be arbitrarily set, for example, 1 km, 2 km, 5 km, etc. by changing the opening time of the high-speed shutter. The number of distance gates is equal to the number of times the high-speed shutter is opened.
図４は、赤外線撮像装置１における撮像処理の具体例を示すフローチャートである。 FIG. 4 is a flowchart illustrating a specific example of the imaging process in the infrared imaging device 1.
Ｓ４０１において、制御器１１はユーザインターフェース（図示省略する）を介してユーザから入力された情報に基づいてレーザ照射器１２の照射方向制御器１２Ｂを動作させ、監視領域に照射方向を合わせる。 In step S401, the controller 11 operates the irradiation direction controller 12B of the laser irradiator 12 based on information input from the user via a user interface (not shown), and adjusts the irradiation direction to the monitoring area.
Ｓ４０２において、第１の赤外線画像検知器１３は、監視領域内に存在する対象物から放出される波長λ１の赤外線を受光し、信号処理器１５が赤外線画像用信号を生成する。 In S402, the first infrared image detector 13 receives the wavelength lambda 1 of the infrared rays emitted from the object present in the monitoring area, the signal processor 15 produces an infrared image signal.
Ｓ４０３において、レーザ照射器１２から赤外パルスレーザ光を照射すると共に、第２の赤外線画像検知器１４が波長λ２の反射光を距離ゲート内に存在する物体から受光し、信号処理器１５が赤外線反射画像用信号を生成する。ここでは、Ｓ４０２およびＳ４０３は並列的に行われる。 In S403, the infrared irradiating laser beam is emitted from the laser irradiator 12, the second infrared image detector 14 receives the reflected light having the wavelength λ 2 from the object existing in the distance gate, and the signal processor 15 An infrared reflection image signal is generated. Here, S402 and S403 are performed in parallel.
Ｓ４０４において、制御器１１は、ユーザインターフェース（図示省略する）を介してユーザから入力された情報が赤外線受光画像の表示要求か否かを判定する。ここで、赤外線受光画像の表示が要求された場合には、制御器１１は画像表示器１６に赤外線受光画像用信号に基づいて赤外線受光画像を表示させ（Ｓ４０５）、処理を終了する。図５は、図３の監視領域について画像表示器１６に表示される画像の具体例を示す図である。図５（ａ）は、第１の赤外線検知器１３から出力された電気信号を信号処理した赤外線受光画像であり、監視領域内の全体像が表示されている。 In step S <b> 404, the controller 11 determines whether information input from the user via a user interface (not shown) is a request for displaying an infrared light reception image. Here, when the display of the infrared light reception image is requested, the controller 11 causes the image display 16 to display the infrared light reception image based on the infrared light reception image signal (S405), and the process is terminated. FIG. 5 is a diagram showing a specific example of an image displayed on the image display 16 for the monitoring area of FIG. FIG. 5A is an infrared light reception image obtained by performing signal processing on the electrical signal output from the first infrared detector 13, and an overall image in the monitoring area is displayed.
これに対し、赤外線反射画像（レーザレーダ画像）の表示が要求された場合には、制御器１１は画像表示器１６に赤外線反射画像用信号に基づいて赤外線反射画像を表示させ（Ｓ４０６）、処理を終了する。図５（ｂ）は、第２の赤外線検知器１４から距離ゲート内の対象物について出力された電気信号を変換処理した赤外線反射画像（レーザレーダ画像）であり、距離ゲート内に存在する飛翔体３および樹木５Ａ、５Ｂの画像が表示されている。 On the other hand, when the display of the infrared reflection image (laser radar image) is requested, the controller 11 causes the image display 16 to display the infrared reflection image based on the infrared reflection image signal (S406). Exit. FIG. 5B is an infrared reflection image (laser radar image) obtained by converting the electrical signal output from the second infrared detector 14 for the object in the distance gate, and the flying object existing in the distance gate. 3 and trees 5A and 5B are displayed.
図６は、赤外線受光画像生成処理（Ｓ４０２）の具体例を示すフローチャートである。 FIG. 6 is a flowchart showing a specific example of the infrared received light image generation process (S402).
Ｓ６０１において、第１の赤外線検知器１３は、高速シャッターを開き、検知素子１３１において受光準備を行う。Ｓ６０２において、第１の赤外線検知器１３は、監視領域内の物体が発する中波長（波長λ１）の赤外線を検知素子１３１において受光する。 In step S <b> 601, the first infrared detector 13 opens the high-speed shutter, and the detection element 131 prepares for light reception. In step S <b> 602, the first infrared detector 13 receives infrared light having a medium wavelength (wavelength λ 1 ) emitted from an object in the monitoring region by the detection element 131.
Ｓ６０３において、第１の赤外線検知器１３は、所定の時間の経過後に高速シャッターを閉じ、受光を終える。Ｓ６０４において、第１の赤外線検知器１３は、受光した赤外線の光電変換により生成した電気信号を信号処理器１５（第１の信号処理部１５Ａ）へ出力する。 In step S <b> 603, the first infrared detector 13 closes the high-speed shutter after a predetermined time has elapsed, and ends the light reception. In S604, the first infrared detector 13 outputs an electric signal generated by photoelectric conversion of the received infrared ray to the signal processor 15 (first signal processing unit 15A).
Ｓ６０５において、信号処理器１５（第１の信号処理部１５Ａ）は、第１の赤外線検知器１３から出力された電気信号の信号処理を行い、赤外線受光画像用信号を生成して処理を終了する。 In S605, the signal processor 15 (first signal processing unit 15A) performs signal processing of the electrical signal output from the first infrared detector 13, generates an infrared received light image signal, and ends the processing. .
図７は、赤外線反射画像生成処理（Ｓ４０３）の具体例を示すフローチャートである。 FIG. 7 is a flowchart showing a specific example of the infrared reflection image generation processing (S403).
Ｓ７０１において、レーザ発生器１２Ａは、制御器１１からの制御情報に基づいて赤外パルスレーザ光を生成し、照射方向制御器１２Ｂで定められた方向へ照射する。尚、赤外パルスレーザ光を赤外線受光画像の全範囲について照射するのに長時間を要する場合は、所定の条件で照射領域を狭めることが好ましい。例えば、照射方向を中心部のみに限定する方法、ユーザが範囲を指定する方法、あるいは、赤外線受光画像を解析し時間経過により移動が認められる物体を検知し、その範囲のみ照射対象とする方法など任意に設定できる。 In S701, the laser generator 12A generates infrared pulse laser light based on the control information from the controller 11 and irradiates it in the direction determined by the irradiation direction controller 12B. In addition, when it takes a long time to irradiate the infrared pulse laser beam over the entire range of the infrared light receiving image, it is preferable to narrow the irradiation region under a predetermined condition. For example, a method in which the irradiation direction is limited to the central part, a method in which the user designates a range, or a method in which an infrared light reception image is analyzed to detect an object that is recognized to move over time, and only that range is targeted for irradiation. Can be set arbitrarily.
Ｓ７０３において、第２の赤外線検知器１４は、レーザ発生器１２Ａから照射された赤外パルスレーザ光の反射光（波長λ２の近赤外線）を検知素子１４１において受光する。Ｓ７０４において、第２の赤外線検知器１４は、所定の時間の経過後に高速シャッターを閉じ、受光を終える。 In S703, a second infrared detector 14 receives the infrared pulse laser beam of the reflected light emitted from the laser generator 12A (wavelength lambda 2 of the near infrared) in the sensing device 141. In S <b> 704, the second infrared detector 14 closes the high-speed shutter after a predetermined time has elapsed, and ends the light reception.
尚、高速シャッターの開放時間（受光時間）に基づいて画像の取得範囲である距離ゲートの長さが決定される。図８は、高速シャッターの開閉と反射光到達時間の関係を説明する図である。同図において、縦軸は反射光の光量、横軸は反射光到達時間であり、受光対象となる反射光を斜線で示している。受光時間の長さは距離ゲートの幅に比例し、反射光到達時間は被照射体からの距離に比例するので、ｔ１で高速シャッターを開いてからｔ２で閉じるまでに受光した反射光がｄ１〜ｄ２のゲート内に存在する被照射体に係る反射光として受光される。すなわち、高速シャッターの開閉によって連続的に撮像することで、特定波長の反射光の受光タイミングの相違に基づいて被照射体がどの距離ゲートに含まれるのかを判別でき、高速で移動する対象物（例えば飛翔体）も追跡できる。 The length of the distance gate, which is the image acquisition range, is determined based on the opening time (light reception time) of the high-speed shutter. FIG. 8 is a diagram for explaining the relationship between the opening and closing of the high-speed shutter and the reflected light arrival time. In the figure, the vertical axis indicates the amount of reflected light, the horizontal axis indicates the reflected light arrival time, and the reflected light to be received is indicated by diagonal lines. Since the length of the light receiving time is proportional to the width of the distance gate and the reflected light arrival time is proportional to the distance from the irradiated object, the reflected light received between the time when the high-speed shutter is opened at t 1 and the time when it is closed at t 2 It is received as reflected light relating to the irradiated object existing in the gates d 1 to d 2 . In other words, by continuously capturing images by opening and closing the high-speed shutter, it is possible to determine which distance gate the irradiated object is included on the basis of the difference in the light reception timing of the reflected light of the specific wavelength, and the object that moves at high speed ( For example, flying objects) can be tracked.
Ｓ７０５において、第２の赤外線検知器１４は、受光した反射光を光電変換し、生成した電気信号を信号処理器１５（第２の信号処理部１５Ｂ）へ出力する。 In S705, the second infrared detector 14 photoelectrically converts the received reflected light and outputs the generated electrical signal to the signal processor 15 (second signal processing unit 15B).
Ｓ７０６において、信号処理器１５（第２の信号処理部１５Ｂ）は、出力された電気信号の信号処理を行い、赤外線反射画像用信号を生成して処理を終了する。 In S706, the signal processor 15 (second signal processing unit 15B) performs signal processing of the output electric signal, generates an infrared reflection image signal, and ends the processing.
このように、異なる波長の赤外線を別々に処理することによって、監視領域全体の赤外線画像と共に、所望の距離にある物体の画像のみを抽出して表示可能であるので、背景が複雑な場合にも有効な赤外線撮像装置を構築できる。 In this way, by processing infrared rays of different wavelengths separately, it is possible to extract and display only the image of the object at a desired distance along with the infrared image of the entire monitoring area, so even when the background is complicated An effective infrared imaging device can be constructed.
尚、本発明は上記実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。また、上記実施形態に開示されている複数の構成要素の適宜な組み合わせにより、種々の発明を形成できる。例えば、実施形態に示される全構成要素から幾つかの構成要素を削除してもよい。更に、異なる実施形態にわたる構成要素を適宜組み合わせてもよい。 Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
１…赤外線撮像装置、
２Ａ〜Ｂ…境界面、
３…飛翔体、
４Ａ〜Ｃ…山、
５Ａ〜Ｃ…樹木、
１１…制御器、
１２…レーザ照射器、
１２Ａ…レーザ発生器、
１２Ｂ…照射方向制御器、
１２Ｃ…冷却器、
１３…第１の赤外線検知器、
１４…第２の赤外線検知器、
１５…信号処理器、
１５Ａ…第１の信号処理部、
１５Ｂ…第２の信号処理部、
１６…画像表示器。
1 ... Infrared imaging device,
2A-B ... the boundary surface,
3 ... Flying object,
4A ~ C ... mountain
5A-C ... Trees
11 ... Controller,
12 ... Laser irradiator,
12A ... laser generator,
12B ... Irradiation direction controller,
12C ... cooler,
13 ... The first infrared detector,
14 ... Second infrared detector,
15 ... Signal processor,
15A ... 1st signal processing part,
15B ... Second signal processing unit,
16: Image display.
Claims (7)
この第１の赤外線検知器から出力された電気信号を変換し、赤外線受光画像用信号を生成する第１の信号処理器と、
前記第１の赤外線検知器の受光対象となる赤外線と異なる波長の赤外パルスレーザ光を生成し、前記監視領域内へ照射するレーザ照射器と、
前記赤外パルスレーザ光の照射に連動して、前記外表面において直交する２軸の各方向で前記第１の検知素子に対して交互に配置された複数の第２の検知素子により前記物体からの反射光を逐次受光し、この反射光を光電変換して電気信号を出力する第２の赤外線検知器と、
この第２の赤外線検知器から出力された電気信号を変換し、赤外線反射画像用信号を生成する第２の信号処理器と、
を備えることを特徴とする赤外線撮像装置。 A first infrared detector that receives infrared rays emitted from an object existing in the monitoring region by a plurality of first detection elements arranged on the outer surface, photoelectrically converts the infrared rays, and outputs an electrical signal;
A first signal processor that converts an electrical signal output from the first infrared detector and generates an infrared light-receiving image signal;
A laser irradiator that generates infrared pulsed laser light having a wavelength different from that of the infrared light to be received by the first infrared detector, and irradiates the laser pulse into the monitoring region;
In conjunction with the irradiation with the infrared pulsed laser light, the object is separated from the object by a plurality of second sensing elements arranged alternately with respect to the first sensing element in each of two orthogonal directions on the outer surface. A second infrared detector that sequentially receives the reflected light and photoelectrically converts the reflected light to output an electrical signal;
A second signal processor that converts the electrical signal output from the second infrared detector and generates an infrared reflected image signal;
An infrared imaging device comprising:
この第１の検知素子の受光対象となる赤外線と異なる波長の赤外パルスレーザ光を生成し、前記監視領域内へ照射するレーザ照射器と、
前記赤外パルスレーザ光の照射に連動し、前記物体からの反射光を逐次受光する第２の検知素子と、
を備え、
前記第１および第２の検知素子は、同一面上において直交する２軸の各方向で交互に配置された受光領域を形成し、かつ、前記レーザ照射器のレーザ照射口は、前記受光領域の外周部に配置されることを特徴とする赤外線撮像装置。 A first sensing element that receives infrared rays emitted from an object present in the monitoring area;
A laser irradiator that generates infrared pulse laser light having a wavelength different from that of the infrared light to be received by the first detection element, and irradiates the infrared pulse laser light into the monitoring region;
In conjunction with the irradiation of the infrared pulsed laser light, a second sensing element that sequentially receives reflected light from the object;
With
The first and second sensing elements form light receiving regions arranged alternately in two orthogonal directions on the same plane, and a laser irradiation port of the laser irradiator An infrared imaging device, which is arranged on an outer peripheral portion.
この第１の赤外線受光ステップにおいて出力された電気信号を変換し、赤外線受光画像用信号を生成する第１の信号処理ステップと、
前記第１の赤外線受光ステップにおいて受光対象となる赤外線と異なる波長の赤外パルスレーザ光を生成し、前記監視領域内へ照射する赤外レーザ照射ステップと、
前記赤外パルスレーザ光の照射に連動して前記物体から前記赤外パルスレーザ光の反射光を逐次受光し、この反射光を光電変換して電気信号を出力する第２の赤外線受光ステップと、
この第２の赤外線受光ステップにおいて出力された電気信号を変換し、赤外線反射画像用信号を生成する第２の信号処理ステップと、
を有することを特徴とする赤外線撮像方法。 A first infrared light receiving step of receiving infrared rays emitted from an object in the monitoring area, photoelectrically converting the infrared rays and outputting an electrical signal;
A first signal processing step of converting the electrical signal output in the first infrared light receiving step to generate an infrared light receiving image signal;
An infrared laser irradiation step of generating an infrared pulse laser beam having a wavelength different from that of the infrared light to be received in the first infrared light receiving step and irradiating the infrared pulse laser beam into the monitoring region;
A second infrared light receiving step of sequentially receiving reflected light of the infrared pulsed laser light from the object in conjunction with irradiation of the infrared pulsed laser light, photoelectrically converting the reflected light and outputting an electrical signal;
A second signal processing step of converting the electrical signal output in the second infrared light receiving step to generate an infrared reflected image signal;
An infrared imaging method characterized by comprising:
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