coelostat

Thân thiện

The astronomer adjusts the coelostat to track the sun.

Definition

Noun: A coelostat is an optical instrument used in astronomy. Its primary function is to track the apparent motion of a celestial body (like the Sun or a star) across the sky and reflect a steady, stationary beam of its light into a fixed telescope. It achieves this using a system of mirrors, typically one movable mirror and one fixed mirror.

Usage

The coelostat is used to allow a stationary telescope to observe a moving celestial object for extended periods without the telescope itself having to move. This is crucial for detailed studies, such as solar observation.

Examples

• Noun:
  • The astronomer used a coelostat to direct sunlight into the spectrograph for a full day of solar analysis.
  • For the eclipse experiment, they set up a coelostat to feed a constant image of the Sun to the underground laboratory.
  • Large solar telescopes often employ a coelostat at the top of a tower to guide light down to the main instruments.

Advanced Usage

• In compound instruments: The term is used to describe the specific mirror-tracking component within a larger astronomical setup.
  • The observatory's main solar telescope uses a coelostat system mounted on a polar axis.

Variants and Related Words

• Heliostat (noun): A related optical device that tracks the Sun specifically to reflect its light in a fixed direction, often for solar energy or illumination purposes. While similar, a heliostat usually reflects light to a fixed target on Earth, whereas a coelostat is designed to feed a fixed telescope.

Synonyms

• Solar tracker (in the specific context of tracking the Sun, though this is a broader, more general term).
• Siderostat (noun): An older or more general term for a similar instrument that tracks stars to reflect their light into a fixed telescope.

Học thuật

Noun

1. optical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror