Infrared integration camera profiling and selection (1)

A, infra-red and infrared light of the principle of

Light is a wave that has the same nature of radio waves.

Its wavelength interval from several nanometer (1nm = 10-9m) to 1 mm (mm). The human eye visible is only part of, we refer to it as visible light, visible light in the wavelength range for 380nm to 780nm wavelength of visible light by the Minister, to the short divided into red, Orange, yellow, green, green, blue, violet, wavelength shorter than violet, called UV wavelength than infrared long called infrared. Wavelength infrared line in 780nm ~ 1000 μ m, is located between the radio and visible light. Infrared lamp by infrared radiation mechanism into semiconductor solid light (IR infrared emitting diodes fed)

Infrared light and thermal infrared light.

Currently in CCTV infrared camera is used more in the former.

Infrared emitting diodes (IR LED) infrared light principle is: the infrared emitting diode matrix composed of luminous body.

Infrared emitting diode by infrared radiation efficiency of materials (commonly used gallium arsenide GaAs) pn junction, plus forward bias voltage to PN injection current excitation infrared. Spectral power distribution center wavelength 830 ~ 950nm, about half-peak bandwidth, it is an 40nm around narrow distribution, CCD b/w camera as normal to feel.

Infrared led transmit power with irradiance μ W/m 2.

Infrared diodes of maximum radiation intensity, generally within the optical axis of the front, and with the direction and axis angle of radiation increases and decreases. Radiation strength to maximum of 50% of the angle is called the half intensity radiation angle, that is, half the power point. Different packaging process models of infrared radiation angle of light emitting diodes.

II. infrared-one camera imaging

In night vision surveillance system, the general approach is the use of visible light, but this way there can not be concealed, easy exposure monitoring targets, and so on shortcomings, so using less; currently hidden, science night vision surveillance using infrared imaging technology.

Infrared camera technology is divided into passive and active. Passive infrared camera technology is the use of any substance at absolute zero (-273 ° c) above have infrared radiation, the body's temperature is higher, the infrared radiation. This principle of camera the most typical is the thermal infrared imager, however, this particular infrared camera cost and, therefore, be limited to the use of military or special occasions. And active infrared camera technology, is the use of infrared lamp radiation "lighting" (mainly infra-red line), the application of the ordinary low illumination black and white video camera, video camera or color to black and white infrared low illumination color camera, feel around the scene and environment reflected infrared for night vision surveillance. Active infrared camera technology is mature, stable, become the mainstream of night vision surveillance.

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