parabolic reflector
Noun: A parabolic reflector is a concave, dish-shaped reflective surface with a parabolic cross-section. Its precise geometric shape is designed to either: 1. Collimate light or other radiation: When an energy source (like a light bulb or radio antenna feed) is placed at its focal point, the reflector directs the emitted waves into a parallel beam. 2. Concentrate incoming waves: Conversely, it can collect incoming parallel waves (e.g., satellite signals, light) and focus them onto a single point at its focus.
The term is used to describe the key functional component in devices that require directing or collecting electromagnetic waves or sound with high precision. * The satellite dish is a parabolic reflector designed to collect weak signals from space. * A flashlight uses a small parabolic reflector behind the bulb to create a focused beam of light. * The telescope's large parabolic reflector gathers and focuses starlight onto its sensor.
- Physics/Engineering Context: In technical specifications, the performance of a parabolic reflector is described by its focal length, diameter (aperture), and surface accuracy. It operates on the principle that any ray originating from the focus will be reflected parallel to the axis of symmetry, and vice-versa.
- Alternative Terminology: In specific fields, it may be called a parabolic dish or simply a dish antenna when used for radio frequencies.
- Paraboloid (n): The three-dimensional geometric shape (a surface of revolution) that defines the ideal form of a parabolic reflector.
- Parabolic antenna (n): A complete antenna system that uses a parabolic reflector as its main component.
- Searchlight (n): A device that typically employs a large parabolic reflector to project a powerful beam of light.
- Dish reflector
- Parabolic mirror (specifically for optical wavelengths)
- Concave reflector (broader term, as not all concave reflectors are parabolic)
- Focal point / Focus (n): The fixed point where incoming parallel rays converge or from where divergent rays originate to become parallel after reflection.
- Axis of symmetry (n): The central line through the vertex and focus of the parabola, which is the central axis of the reflector.
- To collimate (v): To make parallel, which is the primary function of a parabolic reflector with a source at its focus.
- a concave reflector used to produce a parallel beam when the source is placed at its focus or to focus an incoming parallel beam