Objectives: Specifications and Identification - what is the function of the objectives on a microscope

 2024-11-18 17:12:05

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Infrared waves

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Infrared waves are longer than visible light waves but shorter than radio waves. Correspondingly, the frequencies of IR are higher than microwave frequencies but lower than visible light frequencies, ranging from about 300 gigahertz to 400 terahertz (THz).

Infrared is commonly separated into near-, mid- and far-infrared. It can also divide into the following five categories:

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Infrared radiation

Infrared has a variety of uses and applications. Some common uses for IR include heat sensors, thermal imaging and night vision equipment.

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Mid infrared

In networking, wired and wireless operations use infrared light. Remote controls use near-infrared light, transmitted with LEDs, to send focused signals to home-entertainment devices, such as televisions. Fiber optic cables also use infrared light to transmit data.

Infrared is typically subdivided into multiple spectral regions, or bands, based on wavelength. However, there is no uniform definition of each band's exact boundaries.

Infrared light is invisible to the human eye, but heat sensors can detect longer infrared waves. Infrared shares some characteristics with visible light, however. Like visible light, infrared light can be focused, reflected and polarized.

Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm).

near-infraredwavelength

In addition, astronomers extensively use infrared to observe objects in space that the human eye can't detect, such as molecular clouds, stars, planets and active galaxies.

Infrared spectroscopy

infrared radiation中文

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British astronomer Sir William Herschel discovered infrared in 1800. Herschel knew sunlight could separate into components, which occurs when light refracts through a glass prism. He then measured the temperatures of the different colors created.

Herschel found the temperature increased as the colors progressed from violet all the way to red light. Herschel then went a step further and measured the temperature in the portion beyond the red area. There, in the infrared area, he found the temperature was the highest of all.