What technologies are available for measuring consistency on-line and how do they work?
Shear force transmitters are the most often applied measurement. These transmitters measure the force necessary to separate or shear through the fiber network. There are three optical technologies: Attenuation of light, reflection of light and de-polarization of polarized light. Radioactive density meters saw resurgence in the early 1990’s but fizzled again because of the limits of the technology. The latest and perhaps most promising technology is the microwave-based measurement. They measure the time of flight or velocity of the microwave as it traverses between antennas.
