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Shenzhen Changehome Microelectronics Co.,Ltd

Radiation Direction And The Angle Between The Optical Axis Decreases

Light is an electromagnetic wave, usually people will be divided into infrared light near, middle and far infrared three parts. Near-infrared wavelength of 0.75 to 3.0 microns; Mid-infrared wavelength of 3.0 to 20 microns; Far-infrared wavelength is 20 to 1000 microns.

Light is an electromagnetic wave that has the same nature as radio waves. Its wavelength range from a few nanometers (1nm = 10-9m) to about 1 mm (mm). Visible to the human eye is just a part of it. We call it visible light. The wavelength range of visible light is from 380nm to 780nm. The wavelength of visible light is short, red, orange, yellow, green, blue, blue and violet Known as the ultraviolet light, the wavelength is longer than the infrared light is called infrared light. Infrared light wavelengths between 780nm ~ 1000μm, located between the radio waves and visible light.

Infrared light by its infrared radiation mechanism is divided into semiconductor solid light (infrared emitting diode IR LED)

Infrared light and heat radiation infrared light two. The former uses more CCTV infrared cameras.

Infrared emission diode (IR LED) The principle of infrared light is: the luminous body consists of infrared light-emitting diode array. Infrared emitting diodes from the infrared radiation efficiency of materials (commonly used gallium arsenide GaAs) made of PN junction, plus a forward bias voltage into the PN junction current excitation of infrared light. Spectral power distribution center wavelength of 830 ~ 950nm, half-peak bandwidth of about 40nm, it is a narrow-band distribution for ordinary CCD black and white camera can feel the range.

The emission power of infrared light-emitting diodes is expressed in irradiance μW / m2. Infrared diode maximum radiation intensity generally in front of the optical axis, and with the radiation angle and the angle between the optical axis decreases. The angle at which the radiation intensity is 50% of the maximum is called the half-intensity radiation angle, that is, the half-power angle. Infrared light-emitting diodes of different packaging process models have different radiation angles.

Infrared light has different power and 715,830 nM two wavelengths, the wavelength of the different determines the infrared light illumination distance and effect:

715nM infrared light because of its long distance lighting, the effect is good, but will have a red storm (home digital camera fill light is used for this infrared light);

The use of 830nM infrared light basically no red storm or a small red storm

In the general market, infrared lamps mainly using infrared emitting diodes are introduced. The principle and characteristics of the infrared lamps are described as follows: A luminous body is composed of an infrared light emitting diode matrix. Infrared emission diode from the infrared radiation efficiency of materials (commonly used gallium arsenide GaAs) made of PN junction, plus a forward bias to the PN junction into the current excitation of infrared light. Its biggest advantage is that it can completely red storm (using 940 ~ 950nm wavelength infrared tube) or only weak red storm (red storm is visible red) and long life. The emission power of infrared light-emitting diodes is expressed in irradiance μW / m2. In response to this situation, Foxconn FI-930C and FI-970C take full account of this issue in the design, the use of high-efficiency light-emitting diodes, built-in cooling system inside the camera, the camera stable working time up to 25,000 hours!


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