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Bringing the Visible Universe into Focus with Robo-AO

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Published on: February 12, 2013

Cooled baffle system for spaceborne infrared telescopes.

J J Bock, A E Lange, H Matsuhara

|November 2, 2010

Summary

A new baffle system for cooled infrared telescopes effectively rejects off-axis light using a reflecting forebaffle and black aftbaffle. This design minimizes heat load and improves measurements of faint cosmic signals.

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Area of Science:

Optical Engineering
Astrophysics
Telescope Instrumentation

Background:

Infrared telescopes require sophisticated baffling to reject unwanted off-axis radiation.
Minimizing thermal emission and scattered light is crucial for sensitive astronomical observations.

Purpose of the Study:

To design and test a compact baffle system for cooled infrared telescopes.
To evaluate the baffle system's effectiveness in rejecting off-axis infrared radiation.

Main Methods:

The baffle system comprises a reflecting forebaffle and a black aftbaffle.
Ground-based measurements at 0.9 µm and rocketborne measurements at far-infrared wavelengths were conducted.
Effective emissivity of the cooled forebaffle was measured.

Main Results:

The baffle system demonstrated high rejection of off-axis emission.
The forebaffle reflects radiation >40° off-axis, reducing aperture heat load.
The effective emissivity of the cooled forebaffle was measured at 7 × 10⁻³.

Conclusions:

The developed baffle system is effective for cooled infrared telescopes.
The system successfully reduces stray light and heat load.
It has been utilized in rocketborne diffuse infrared background measurements and will be used in the Infrared Telescope in Space.