How humans discovered infrared light 5

Discovery: In 1800, when Huxel was studying sunlight, he used a thermometer to measure the heat contained in different colors in the light bands. During the experiment, he stumbled upon a strange phenomenon:

A thermometer placed outside the red light of the light strip is higher than the indicated value of the other temperatures in the room. After trial and error, this so-called high-temperature area with the most heat is always located outside the red light at the very edge of the light band. So he announced that in addition to the visible rays emitted by the sun, there is also a kind of invisible "**" of the human eye, and the invisible "**" of the human eye is located on the outside of the red chain holding color light, which is called infrared rays.

Extension: Infrared is an electromagnetic wave with the same nature as radio waves and visible light. Generally, infrared rays can be simply classified according to wavelength, such as near-infrared, short-wave infrared, medium-wave large-cavity infrared, thermal infrared, far-infrared, etc.

The discovery process of infrared light is as follows:

Infrared is one of the many invisible rays of the sun's rays, discovered by the British scientist Herschel in 1800, also known as infrared thermal radiation, with strong thermal effect. He split the sunlight with a prism and placed thermometers at the positions of the ribbons of various colors in an attempt to measure the heating effect of the various colors of light. It turned out that the thermometer on the outside of the red light warmed up the fastest.

Therefore, it is concluded that in the solar spectrum, there must be invisible light on the outside of the red light, which is infrared light. It can also be used as a medium of transmission.

The wavelength of infrared rays on the solar spectrum is greater than that of visible light, and the wavelength is. Infrared can be divided into three parts, namely near-infrared, with a wavelength of (between; Mid-infrared, wavelength (between; Far infrared rays with wavelengths between (25-40) l500 m.

The U.S. Space Command (NASA) research report pointed out that in the infrared, the far infrared rays of 4-14 microns are helpful to the human body, which heats up from the inside and promotes the expansion of microvascularity from the body, so that the blood circulation is smooth, and the purpose of metabolism is achieved, thereby increasing the body's immunity and rate. However, according to the theory of black-body radiation, it is not easy for general materials to produce far-infrared rays of sufficient intensity, and it is usually necessary to convert energy with special substances, and the heat it absorbs is emitted by the vibration of internal molecules and then emitted far-infrared rays with longer wavelengths.

Infrared is electromagnetic light with a wavelength between microwaves and visible light, with wavelengths between 760 nanometers (nm) and 1 millimeter (mm), which is longer than red light. Anything above absolute zero can produce infrared. Modern physics calls this a heat ray.

Medical infrared can be divided into two categories: near-infrared and far-infrared. Containing thermal energy, the heat of the sun is mainly transmitted to the earth through infrared rays.

We call radiation other than red light infrared light (ultraviolet light outside of violet light) and is invisible to the naked eye.

Infrared light is detected by the camera. The camera can shine some light that is not visible to the naked eye. For example: the light emitted by the remote control.

Because the wavelength of infrared light is not in the wavelength range of light visible to the human eye.

This is because infrared light is not visible to humans.

Because the human eye cannot see light that is too high or too low at a frequency, the wavelength range of light visible to the human eye is 3900-7700 angstroms, and the wavelength of light determines the color of light, which is purple blue, blue, green, yellow, orange, red.

The wavelengths that humans can see do not include infrared light.

The wavelength range of visible light is 3900-7700 angstroms, and the wavelength of light determines the color of light, which is purple blue, blue, yellow, orange, red.

Infrared light, ultraviolet light is invisible, visible light is visible.

This is because infrared light is invisible light.

Because there is a range of wavelengths of visible light to the human eye.

Because the human eye cannot see light that is too high or too low in frequency

Because infrared light is invisible to humans.

In 1672, it was discovered that sunlight (white light) is made up of a composite of various colors of light. At that time, Newton famously concluded that monochromatic light was simpler in nature than white light. Sunlight (white light) can be decomposed into monochromatic light such as red, orange, yellow, green, cyan, blue, and violet with a beamsplitting prism.

In 1800, the British physicist Herschel discovered infrared light when he studied various colors of light from the point of view of heat.