Infrared (IR) frequencies refer to the electromagnetic spectrum just beyond the visible light range and before the microwave range. Here are some key points about infrared frequencies:
Wavelength and Frequency:
- Infrared waves have wavelengths ranging from approximately 700 nanometers (nm) to 1 millimeter (mm).
- This places IR frequencies between roughly (4 \times 10^{14}) Hz and (3 \times 10^{11}) Hz.
Properties:
- Infrared waves can be felt as heat, and this is why they are sometimes called “heat waves”.
- They are largely absorbed by water, and this absorption characteristic plays a crucial role in several of its applications and effects on the environment.
Divisions:
- Near Infrared (NIR)Closest to visible light, used in electronics and optical communications.
- Short-Wave Infrared (SWIR)
- Mid-Wave Infrared (MWIR)
- Long-Wave Infrared (LWIR)Typically perceived as radiant heat.
- Far Infrared (FIR)Farthest from visible light, used in thermal detectors and imaging.
Applications:
- Remote ControlsMost TV and audio system remote controls use IR to transmit signals.
- Thermal ImagingInfrared cameras can detect IR radiation emitted by warm objects, making them useful in night vision, surveillance, and diagnosing heat leaks in buildings.
- HealthSome believe that far-infrared saunas offer health benefits, including relaxation and better circulation.
- AstronomyIR telescopes can observe celestial objects that are not detectable in visible light.
- CommunicationSome short-range wireless communication technologies use IR (like the old-style IR ports on some laptops and phones).
- Fiber Optic CablesNear-infrared frequencies are often used in optical communication.
Safety:
- Infrared radiation, especially near-infrared, is generally considered safe. However, prolonged exposure, especially from high-powered sources, can cause thermal injuries.
Atmospheric Effects:
- Infrared radiation plays a significant role in the Earth’s energy balance. Greenhouse gases in the atmosphere, such as water vapor and carbon dioxide, absorb and emit infrared radiation, contributing to the greenhouse effect.
- In weather science, infrared sensors on satellites are used to track cloud temperatures and formations.
Understanding infrared frequencies is essential for various fields, from consumer electronics to climate science, due to its diverse applications and interactions with matter.
Key terms in plain language
Open a term for a concise explanation of language used on this page.
Fiber Internet
Internet delivered through strands of glass using light. Fiber commonly supports high capacity, low latency, and strong upload performance, but availability must be confirmed for the exact address.
Cloud Computing
Computing resources—such as applications, servers, storage, or databases—delivered from remote infrastructure and scaled as requirements change.
Infrastructure as a Service (IaaS)
Cloud-based servers, storage, and networking that customers configure and manage without owning the underlying data-center hardware.
Software as a Service (SaaS)
Software accessed as an online service instead of being installed and maintained entirely on the customer’s own computers or servers.
Disaster Recovery (DRaaS)
A plan and service for restoring applications, data, and operations after an outage or disruption. DRaaS provides recovery infrastructure through a managed cloud service.
Identity and Access Management (IAM)
The systems and policies that determine who a user is, what resources they may access, and how that access is authenticated and reviewed.