What does 850nm mean?
Share
Definition and Explanation of 850nm Wavelength
The term 850nm refers to the wavelength of light that measures approximately 850 nanometers (nm). A nanometer is a unit of length in the metric system equivalent to one billionth of a meter (1 nm = 10-9 meters). The specific wavelength of 850nm falls within the infrared (IR) spectrum of light, which is beyond the range of visible light detectable by the human eye.
Key Characteristics of 850nm Wavelength
- Infrared Light: 850nm is categorized as near-infrared (NIR) light, which is close to the visible spectrum and often used for a variety of applications due to its lower absorption by water and atmospheric components.
- Invisible to the Human Eye: While humans cannot see 850nm light, some digital cameras and night vision devices are equipped with sensors that can detect it, making it useful for low-light imaging.
- Applications: Common applications of 850nm light include remote controls, security cameras, night vision systems, and fiber optic communications, where it benefits from lower dispersion and attenuation compared to longer IR wavelengths.
- Safety: Generally, 850nm IR light is considered safe for exposure to the eyes under normal circumstances, but high-intensity sources can still be hazardous.
Examples of 850nm Wavelength Usage
| Application | Description |
|---|---|
| Fiber Optic Communications | The 850nm wavelength is widely used in fiber optic communication systems for short to medium range data transmission. |
| Surveillance Cameras | In security and surveillance, 850nm IR LEDs are often used to provide illumination that is invisible to intruders yet detectable by cameras. |
| Medical Imaging | Near-infrared light at 850nm can penetrate biological tissues and is used in some forms of medical imaging and diagnostics. |
| Biometric Systems | In biometric devices, such as retina scanners, 850nm light promotes the clear capture of features without causing discomfort or harm. |
Understanding the properties and applications of the 850nm wavelength is important for the development of a broad range of optical products and systems that leverage near-infrared light for communication, imaging, and sensing purposes.