Proportion of solid colour fibres can be exactly predicted utlizing the least square calculating method.This colour matching result is matchable to spectrum.
The intensity modulation method is the oldest and simplest method for fiber-optic sensor, in which a homochromatic laser is used as system light source.
Laser is a new light source.Comparing with ordinary light the laser has good monochromaticity, directivity, coherency, high brightness, high power and high energy etc.
In this paper, the importance of the interference filter's monochromatism for realizing high singal-to-noise ratio and its application in the biochemical instruments,are described in detail.
With convolution integral, a new formulation for describing the relation of soft X-ray reflectivity of multilayer with the different energy Monochromaticity of incident light is deduced.