Dust Concentration Measurement for Sprayed Concrete Suspended Dust for Tunnel Construction Work by using Digital Camera

在隧道施工过程中，闪光照片中出现白色斑点是模拟相机时代的隧道工程师的一个事实。这是因为悬浮的尘埃反射起来就像雪一样，受到米氏闪光的散射。利用这一现象，发展了一种利用数码相机进行简易粉尘浓度测量的方法。该测量系统是基于神经网络系统的。该神经网络系统研究了数码粉尘指示器的数值与闪光数码相机白度的关系。结果发现，从数码相机闪光灯图像中简单地测量粉尘浓度与数码粉尘指示器的数值有很好的关系。

It was a fact among the tunnel engineers from the era of analog cameras that the white marks appear in the flashed photograph during the tunnel construction. This reason is that suspended dusts reflect like a snow by Mie scattering of flash light. By using this phenomenon, the simple dust concentration measurement by using digital camera was developed. This measurement system was based on the neural network system. This neural network system studies the relationship the value of the digital dust indicator and the whiteness of the flashed digital camera. As a result, it found that simple dust concentration measurement from the digital camera flash image has a good relationship the value of digital dust indicator.