infrared
Học thuậtThân thiện
Definition
Adjective:
- Having or using electromagnetic radiation with wavelengths longer than those of visible red light but shorter than those of radio waves. This radiation is invisible to the human eye.
- Relating to, producing, or using this type of radiation.
Noun (uncountable):
- The part of the electromagnetic spectrum consisting of infrared radiation.
- Infrared radiation itself.
Usage Examples
Adjective:
- Many security cameras use infrared light to see in the dark.
- The scientist studied the object using an infrared telescope.
- This material is designed to reflect infrared heat.
Noun:
- The remote control communicates with the television using infrared.
- Snakes can detect the infrared emitted by warm-blooded prey.
- Astronomers observe infrared from distant stars to learn about their composition.
Advanced Usage
- Infrared spectroscopy: An analytical technique that uses infrared light to identify molecules based on how they absorb specific wavelengths.
- Near-infrared (NIR) / Far-infrared (FIR): Subdivisions of the infrared spectrum based on wavelength, with different applications (e.g., NIR in fiber optics, FIR in thermal imaging).
- Passive vs. Active Infrared: Passive systems detect infrared naturally emitted by objects (like thermal cameras), while active systems emit infrared and detect its reflection (like some night-vision systems).
Variants and Related Words
- IR (abbreviation): A common abbreviation for infrared.
- The device has an IR receiver.
- Thermal imaging / Thermography: A technology that creates images based on the infrared radiation (heat) emitted by objects.
- Infrared lamp: A lamp that emits infrared radiation, often used for therapeutic heating.
Synonyms
- Radiant heat (in specific contexts, as infrared is often perceived as heat).
- Thermal radiation (specifically for the longer-wavelength infrared associated with heat).
Related Phrases and Compounds
- Infrared sensor: A device that detects infrared radiation.
- Infrared spectrum: The range of wavelengths that constitute infrared radiation.
- Infrared astronomy: The branch of astronomy that observes and studies infrared radiation from celestial objects.
Adjective
- having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end
- infrared radiation
- infrared photography
Noun
- electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves
- the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range
- they could sense radiation in the infrared