Detector

Definition

A detector is a device used to capture and measure electromagnetic radiation or particles. In astronomy, detectors are essential for converting light from celestial objects into data that can be analyzed.

5 Must Know Facts For Your Next Test

1. Detectors in telescopes can include CCDs (charge-coupled devices) and photomultiplier tubes.
2. The sensitivity of a detector determines how faint an object it can observe.
3. Detectors must often be cooled to reduce thermal noise, which can interfere with measurements.
4. Different types of detectors are used for different wavelengths of light (e.g., optical, infrared, X-ray).
5. The resolution of a detector affects the level of detail that can be seen in astronomical images.

Review Questions

• What are two common types of detectors used in telescopes?
• Why is it important to cool some detectors during observations?
• How does the wavelength of light being observed influence the choice of detector?

Related terms

CCD: A charge-coupled device that captures photons and converts them into electronic signals for imaging.

Photomultiplier Tube:

A type of detector that amplifies incoming photons to create measurable electrical signals.

Resolution:

The ability of an instrument or detector to distinguish between two closely spaced objects.