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US 4,791,305 AGranted
Method for measuring the properties of a composition consisting of a liquid and solid particles and apparatus used in the method
AssigneeValmey Oy
InventorIlkka Karaila
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Abstract
The invention relates to a measuring method of the properties, especially the dry matter content of cellulose pulp. The most important measurement at the wet end of a paper-making machine is the measurement of dry matter content and quantity of the pulp. The material quantities can be readily measured from a finished product but the wet end optimal control requires a method and apparatus capable of measuring reliably the dry matter content of mass suspension.
Claims18
A method for measuring the properties, especially the dry matter content of a composition consisting of a liquid and solid particles, said method comprising
- leading electromagnetic radiation into the composition,
- maintaining the size of a zone to be radiated substantially constant,
- setting the composition and the zone to be radiated in motion relative to each other,
- measuring with a measuring means the intensity of radiation reflecting or scattering back from an electromagnetically radiated zone, the signals therefrom being processed into messages proportional to the properties, especially the dry matter content of a composition, wherein
- the electromagnetic radiation led into a composition is given a wavelength that is smaller than the smallest dimension of the particles in a composition to be measured,
- an intensity function is formed as a result of the movement of an individual particle arriving in and passing by any given zone exposed to radiation and
- the intensity function is processed for finding out time relationships that are proportional to the thus appearing properties of a particle.
4 more elements
Dependencies are inferred from the claim text.