With the development of remote sensing satelite, the infrared and visible light parts have been integrated gradually. As the internal vibration source, the jitter of cryocooler has more and more influence on the imaging quality.At present the study of cryocooler jiiter mostly focus on the inside of the camera.We usually ignore the platform ,regard camera as a separate part,then analysis the displacement between the optical lens. But the platform and the load has the coupling relationship.The flexible platform changes the boundary of the camera.At this time,the rigid motion of the camera becomes dominant. separate research will bring bigger deviation .So two models were created which called the separated camera model and the coupled platform-camera model, then the micro-vibration transmission from the cryocooler to the optical mirrors in both cases was analysised and the relationship between coupling frequency and response size was obtained. by the way, the optical axis jitter and the deviation of the optical alignment caused by cryocooler jitter in the time domain was analysised , through optical sensitivity matrix, the change of line of sight was obtained and then the decline of MTF and the image distortion was obtained. The result shows that when the cryocooler worked, the image motion of the camera in the integration time is 0.25pixels,and the MTF is reduced by 2.5%,but the image distortion can reach 0.52pixels.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Analysis of cryocooler jitter on three-mirror-anastigmat camera imaging


    Beteiligte:
    Liu, Yong (Autor:in) / Wang, Qiaoxia (Autor:in) / Zhang, Ning (Autor:in) / Sun, Xin (Autor:in) / Jiang, Yanhui (Autor:in) / Wang, Mangmang (Autor:in)

    Kongress:

    Seventh Symposium on Novel Photoelectronic Detection Technology and Applications ; 2020 ; Kunming,China


    Erschienen in:

    Proc. SPIE ; 11763


    Erscheinungsdatum :

    12.03.2021





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Three mirror anastigmat optical designs for ISRO's optical payloads

    Abraham, Saji / Biswas, Amiya | SPIE | 2017

    Freier Zugriff

    Optical design of six-mirror Anastigmat(6MA) off-axis freeform system

    Wang, Baohua / Jiao, Wenchun / Li, Ke et al. | British Library Conference Proceedings | 2021



    NICM: cryocooler

    DiNicola, Mike / Mrozinski, Joe | NTRS | 2017


    Cryocooler technology

    Grier, J. F. / Aubon, C. R. | SPIE | 1994