What are the wavelengths of visible light and ultraviolet light?

The wavelength of visible light is between 400 and 760 nanometers.

The ultraviolet wavelength is 10-400 nm.

Visible light is the part of the electromagnetic spectrum that can be perceived by human eyes, and the visible spectrum has no precise range; Ordinary people's eyes can perceive electromagnetic waves with a wavelength between 400 and 760 nm, but some people can perceive electromagnetic waves with a wavelength between 380 and 780 nm.

Ultraviolet is the general name of radiation with wavelength from 0.0 1 to 0.40 micron in the electromagnetic spectrum, which cannot cause human vision. Radiation with a wavelength of 0.0 1~0.4 micron in the electromagnetic spectrum, that is, radiation from the visible ultraviolet end to X-rays. Has the function of sterilization.

Extended data:

Visible light application

remote sensing technology

Visible spectrum remote sensing refers to the remote sensing technology that limits the working band of the sensor to the visible band (0.38 ~ 0.76 micron).

The visible wavelength range of electromagnetic spectrum is about 0.38 ~ 0.76 micron, which is the most commonly used working band in traditional aerial photography reconnaissance and aerial photography mapping. Because the color sensitive range of photosensitive film is just within this wavelength range, black-and-white panchromatic or color images with high ground resolution and interpretation mapping performance can be obtained. However, due to the great limitation of solar illumination conditions and the appearance of infrared photography and multi-band remote sensing, visible light remote sensing has extended its working band to the near infrared region (about 0.9 micron). The imaging mode has also developed from a single photographic imaging to include black-and-white photography, infrared photography, color photography, color infrared photography, multi-band photography and multi-band scanning, and the detection ability has been greatly improved. Visible light remote sensing space photogrammetry marked by the application of framing space camera has great development potential.

communication technology

Visible optical communication technology uses high-speed bright and dark flashing signals invisible to the naked eye, such as fluorescent lamps or light-emitting diodes, to transmit information. Connect the signal to be transmitted to the lighting device, add a photoelectric conversion device at the front end of the receiving end, plug in the power plug and drive the lighting device to work. The system made of this technology can realize indoor lighting and information transmission at the same time, and has broad development prospects.

Reference: Baidu Encyclopedia-Visible Baidu Encyclopedia-Ultraviolet