Lighting electromagnetic radiation to human body of the IEC standard

Radiation has the branch of ionizing radiation and non-ionizing radiation, ionizing radiation ( 电离辐射) Is to point to have enough energy, can put the atomic ionization radiation, such as X, alpha, beta, and gamma rays. Non-ionizing radiation ( Non- 电离辐射) Energy is relatively weak ionizing radiation, ionization non-ionizing radiation does not matter. Lighting equipment produced by electromagnetic radiation belongs to non-ionizing radiation.

lighting electromagnetic radiation to human body impact and the key elements include three aspects: by evaluating the work frequency of the product, the human body can accept electromagnetic radiation limit, lighting effect on the human body measurement and evaluation method.

different lighting light source has a range of frequencies, such as work under dc and its lamps and lanterns, LED power frequency ( 50Hz) Work under tungsten lamp and all kinds of use of gas discharge lamps and lanterns of inductance ballast, and high frequency ( More than 20 KHZ) Work under the gas discharge lamps and lanterns.

after nearly 25 years of research, in the more than 1000 articles and 144 book see, on the basis of electrical and electronics engineers association (2005 IEEE,电气和电子工程师学会。 公司) Published in IEEE C95. 1:20 05 'exposure to radio frequency electromagnetic field 3 KHZ to 300 GHZ level for the security of the people'. On the basis of a certain safety coefficient, according to the side effect to human body health, the standard rules are provided for the general public groups exposed the basic limit ( BF) , under the condition of the people were safe. But the standard is put forward at the same time, due to the given limit the introduction of more conservative safety coefficient, so more than BF does not necessarily mean that not safe.

based on different tissues or parts on the frequency of electromagnetic radiation sensitivity, IEEE C95. 1:05 corresponding fundamental limitation are given.

IEEE C95。 1:20 05, points out that for the near field or reradiation object, due to the electric field intensity ( Unit of V/m) Field strength may be very high in the near field, and with the distance and decrease rapidly, caused by the absorption is very small, only present and the near field of the electromagnetic field energy distribution is very complex, so the current strength in the near field measurement, mA/m2) Better, more real to determine how conforms to the standard.

1, the basic idea of IEC standard

IEC 62493:2009 is suitable for the assessment of human exposure to electromagnetic radiation lighting equipment. Evaluation including frequency between 20 kHz ~ 10 MHz induced current density and lighting around between 100 kHz ~ 300 MHz frequency SAR ( SAR) 。

due to lighting the use of electronic control device for high frequency work in the design of the product is greater than or equal to 20 KHZ frequency, and the working frequency of energy-saving lamps in 2. 51 MHZ ~ 3 MHZ, the standard applicable frequency covers all kinds of lighting products.

2, IEC standard measuring principle according to the results, the effects of electromagnetic radiation to human body is mainly embodied in the body's tissues induced current density and heat effect. Electric field produced by current density, Weight to 0. 85). According to IEC 62493:2009. Magnetic field produced by current density, Weight to 0. 15) And heating according to CISPR 15 measurement.

IEC 62311:2007 'electrical and electronic equipment electromagnetic radiation to human body, 0Hz- 300 ghz) Limit the evaluation of homogeneous digital model of the human body ( As shown in figure 1) Research shows that: the body's head diameter is 210 mm, the neck diameter of 110 mm.

generally think of mannequin head nearest lighting equipment, and the neck of the maximum current density in the human body, measured using a model of the head of the human body as an induction parts of the body to measure induced current, and according to the size of human body neck diameter to calculate the induced current density. IEC 62493 adopted the homogeneous proposed by IEC 62311 human head and neck diameters, as shown in figure 2.

figure 2 is used as the conductive ball diameter measuring device and used for calculation of the neck diameter diagram

the induced current density measurement device is shown in figure 3.

figure 3 measurement device