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随着海洋的开发和国防现代化的需要,水下摄影技术得到普遍的重视和快速的发展。众所周知,来自太阳和天空的总辐射能,在半米的水层中消失超过一半,其原因是在于海水对红外线的强烈吸收,因此选取合适的水下摄影光源对水下摄影就显得十分重要。在大气中摄影一般只要注意介质的散射就可以了,而在海水中,吸收和散射都对摄影充当同样重要的角色,这样对光源的选择就必须兼顾下面几个方面的问题。 1.水下摄影光源的发光光谱必须在海水透射窗部分比较丰富。海水对不同光波的波长有不同的衰减率,一般可以用下列式子来表示:
With the development of the ocean and the need of national defense modernization, underwater photographic techniques have gained universal attention and rapid development. It is well-known that the total radiant energy from the sun and the sky disappears by more than half in half a meter of the water layer due to the intense absorption of infrared by seawater. Therefore, it is very important to select a suitable underwater photography source for underwater photography. Photographing in the atmosphere as long as the general attention to media scattering on it, and in the sea, absorption and scattering both play an equally important role in photography, so the choice of light sources must take into account the following aspects. 1. Underwater photographic light source emission spectrum must be rich in seawater transmission window. Seawater has different attenuation rates for different wavelengths of light waves and can generally be expressed by the following formula: