Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1998-02-25
2000-02-01
Williams, Hezron
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
73 5441, G01N 1110
Patent
active
060189886
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention concerns a method and a device regarding use of a rheometer for determining the rheological properties of a fluid. Viscoelastic and rheological properties of fluids, liquids and other substances are measured under various conditions, so that, in certain cases, these properties will comply with certain requirements and guidelines. In other instances, the reason being determination of a feature associated with these properties.
STATE OF THE ART
When a fluid's rheological properties are measured, a variety of rheometers and other rheological instruments are used. Such measuring equipment usually comprises two measuring bodies between which a test sample is placed. By rotating the measuring bodies in relation to each other, the capability of the sample to transfer momentum is a way to measure the desired property.
It is a problem, however, that a relatively large amount of sample substance is required. It is also a drawback that the measuring bodies have to be carefully cleaned between different measurements. These problems are particularly obvious when a great number of measurements are to be conducted, or when they need to be carried out intermittently or continuously. Examples of fluids for which these problems arise are body liquids such as for instance blood, synovial fluid, saliva, lymph fluid, etc.
Another type of device used for viscosity measurements is found in SU 842941, which presents and describes a method and a device for viscosity measurement of primarily victuals. A screw-wound element of magnetostrictive material is inserted in a receptacle such that the ends of the element extend out of the receptacle. A first coil encloses a projecting first end, and a second coil encloses the projecting second end for sensing the oscillation frequency of the element. The detected oscillation frequency is registered by an electronic device. In certain applications it is disadvantageous that the element must be accessible external to the receptacle.
To measure in accord with the in-line type, that is during an ongoing process, cannot be done in practice using methods hitherto known. It would be desirable for example in the food industry to be able to continuously or repeatedly discharge a sample from a fluid flow and to carry out the measurement.
THE INVENTION IN SUMMARY
It is an object of the invention to essentially eliminate the abovementioned problems and drawbacks. This object is achieved by imparting the features specified in patent claims 1 and 2, respectively, to the invention. Additional objects and advantages of the invention are obvious from the accompanying description, drawing and patent claims.
For the measurement, use is made of strips, wires or other elements of amorphous material having definite magnetomechanical and magnetoelastical properties. Various amorphous alloys, for instance METGLASS, are very suitable in this context. The element is positioned in a receptacle together with the sample whose properties are to be measured. The receptacle is brought into a measuring area which presents certain magnetic conditions, by means of which the element is set into mechanical oscillation. The oscillation frequency of the element is measured by the element's effect on an external magnetic field, and the sample's rheological properties are determined by the measured oscillation frequency of the element. For continuous measurements, among other things, the receptacle can be designed as part of a pipeline or as a bypass of the pipeline, through which the sample is passed.
The invention allows for measurement without the need to reuse mobile parts. Thus, there is no need for preparation of such parts. The measuring cycle will also be very short, a typical value being 1-2 minutes. Multiple measurements can be carried out for the same sample, and it is also possible to conduct several measurements simultaneously.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail using exemplary embodiments with reference to the a
REFERENCES:
patent: 3393553 (1968-07-01), Kleinschmidt
patent: 3777550 (1973-12-01), Kleinschmidt
patent: 4292673 (1981-09-01), DuBae
Hansson Thyresson Patentbyra AB
Politzer Jay L.
Williams Hezron
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