Low background noise is a necessary condition for infrared optical system to achieve long distance and weak target. The noise of long-range weak target detection system is mainly determined by the thermal radiation of the optical. Cooling optical components is the most direct way to obatain low noise. The article describes a light and compact integrated cryogenic optical system, cryogenic optics detector, which is different from the traditional cryogenic telescope module. In this model, imaging lens is assembled in an infrared detector, then the imaging lens is working at temperature low 100K. So a new detection model that realizes ultra-long-distance and ultra-high sensitivity detection at the expense of very small volume power consumption is proposed. The prototype test results show that the integrated cryogenic optical system has good imaging results, and the thermal energy received by the FPA has been greatly suppressed.
For the far distance and weak signal detecting, low background noise is essential. Because the spatial noise of infrared system is mostly determined by spontaneous thermal radiation, it is the most directly method to achieve low spatial noise by refrigerating optics. This paper introduced a low radiation optical system with lens positioned inside of the infrared detector Dewar. The system includes two parts: the two mirror Cassegrain system working at room temperature which images the intermediate focus (IF) and the lens positioned inside of infrared detector Dewar which image the IF to focal plane. The working temperature inside of the infrared detector Dewar is 80K, the cryogenic lens contain three pieces lens whose total weight is below 5g. In view of engineering application, the low radiation optical system, the stray light analysis, cryogenic optics mounting and system testing were discussed. Calculations indicate that the equivalent blackbody radiation temperature (EBRT) is less than 180K.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.