For example, Sichen's visual illumination has a good correlation with pupil size.
Under the condition of road illumination, when the brightness, brightness contrast and angle of view of the target are the same, the visual effect of the human eye is determined by the pupil size: if the blue light content in the radiation spectrum of the illumination source is large, the pupil of the human eye is made. If you shrink more, you will have better visual effects. If you look at the target, you will feel clear, less sensation, and good visibility. Conversely, when the pupil is large, symptoms such as decreased vision and glare may occur at night. Visibility is visible. difference. In order to correctly evaluate the influence of the composition of the blue light in the radiation spectrum of the illumination source on the visual effect, the pupil brightness 161 can be used for evaluation in the bright vision. However, road lighting belongs to the middle vision category. In order to ensure safe, fast and comfortable driving, the influence of the spectral distribution of the road illumination source on the vision should be considered, and the visual light flux of the light source used in the road illumination should be calculated.
1 Sichen visual photometric system is well known, the visual organ is the total structure composed of the visual field of the eye, optic nerve and brain. The process of image vision is that the outside light enters the human eye and forms an image on the retina. The photoreceptor cells on the retina convert the light signal into a bioelectrical signal, and the visual pulse is transmitted to the hill road. The traffic accident is still the "number one killer" for safe production. Although the main cause of traffic accidents is people, cars, and roads, the quality of fixed road lighting at night is also an important cause of traffic accidents. The International Commission on Illumination (CE) survey report shows that good road lighting at night can at least reduce the traffic accident rate of urban roads by 30%. 111. In order to reduce traffic accidents, countries have continuously updated road lighting design standards; The road lighting design standards do not consider the visual impact of the spectral distribution of the road illumination source on the driver, especially the biological effects of the newly discovered third photoreceptor cell on human sensibility. For more than 150 years, it has been thought that there are only two photoreceptors in the human eye: cone-shaped photoreceptor cells and rod-shaped photoreceptor cells. In 2002, David Berso and other scholars at the University of Brown (Bn) in the United States discovered a third kind of photoreceptor-neural cell in the retina of the human eye. This photoreceptor cell has a biological effect on the radiation entering the human eye and gains an understanding of the outside world. This visual effect is called Sichen Vision (ipc) 1231. Although Sichen Vision is a non-image visual effect, it controls the human rhythm and intensity, and affects the pupil size of the human eye. Studies have shown that 41, Sichen visual effect is closely related to the content of blue light in the light source. Fund project: National Natural Science Foundation of China (50678180); Ministry of Education, Doctoral Research Fund Project (20050611007) The sympathetic nerves are finally transmitted to the cortical visual zone at the back of the brain, producing a visual sensation. The visual process of Sichen is not the same as the visual process. Although it is also started by the human eye, it does not transmit the image information directly to the visual cortex of the posterior cortex. Instead, it transmits the optical signal to the nerve cells of the retina. The thalamic pathway (RH), then enters the optic nerve crossover nucleus (SN), the extraventricular nucleus (PVN) and the upper cervical nerve ganglion, and finally passes to the pineal gland, and the Sichen visual process is seen in the middle optic nerve. The endogenous oscillator, which is a biological clock, has an oscillation period of 245h. Under normal circumstances, it mainly relies on the stimulation of light to adjust the biological clock. Every morning, the light adjusts the sleep and wake-up periods to coincide with the day and night cycles. In dark conditions, the pineal gland synthesizes melatonin and is absorbed by the blood to the whole body, which is good for people to rest and sleep.
Studies have shown that Sichen vision is most sensitive to light with a wavelength of 490 å‘·. The corresponding light efficiency is 3850 deduction. The f% spectral light efficiency curve is seen. The spectral light efficiencies of Ming Vision, Dark Vision and Sichen Vision are all at the wavelength. It was obtained after normalization treatment under the condition of 555 m time efficiency of 683 m.1.
2 Road lighting common light source luminous efficiency calculation Road lighting source generally uses high pressure sodium lamp (HPS) or metal halide lamp (MH) in the road lighting design, usually in the bright visual conditions to calculate the luminous efficiency of the light source, that is, using CE Photometric calculation of cone-shaped photoreceptor cells suitable for only 2 fields of view recommended in 1924. This is inconsistent with the actual situation of road lighting, because under the road lighting conditions, the cone-shaped photoreceptor cells and the rod-shaped photoreceptor cells in the human eye are simultaneously active. At this time, the luminous efficiency of the light source is not a fixed value, but with the human eye. A series of values ​​that change as the level of adaptation changes. For Sichen's visual luminous efficiency, if the calculation is based on the current luminous efficiency expression, the maximum value of Sichen visual light efficiency is 3850m.Ye(X) is the spectral power distribution of the light source, w.rmr1; VQ) is the division. Chen visual spectrum light efficiency; Ye is the power of the light source, W under dark vision conditions, the luminous efficiency of the illumination source is V700 (d) d dark vision, the maximum optical performance is 1700 f1; Vu) is the dark visual spectrum optical efficiency .
At present, in the design of road lighting, the spectral light efficiency is used under the visual conditions of 2 visual fields. Light source and 4 Yang Gongxia, Yang Xudong. The third photoreceptor of humans (below). Light source with 6 Chen Zhonglin. Urban road lighting standard research. China Lighting Appliances, 2002 (12) 7-9 (Editor Li Shengchun)
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