Device for measuring the modification time of the physical state of a fluid medium
First Claim
Patent Images
1. A device for measuring the time of change of the physical state of a fluid sample comprising:
- a container for holding the fluid sample;
a ferromagnetic member positioned and arranged so as to be movable in the bottom of the container along a predetermined circular path;
a driving means for generating a periodic rotating magnetic field to said ferromagnetic member which imparts to said member a sustained circular motion along said path; and
a detecting means for detecting the variations of frequency of said circular motion of said ferromagnetic member during the time of change in the physical state of the fluid sample, said detecting means further comprising means for measuring the relative speed of said sustained circular motion of said ferromagnetic member and the relative speed of said periodic rotating magnetic field during the time of change of the physical state of the sample fluid,and means for comparing said measured relative speeds to provide the time of change of physical state of the sample fluid.
0 Assignments
0 Petitions
Accused Products
Abstract
A device for the measurement of time at which the physical state of a fluid medium is modified, comprises a vertical cup which contains the fluid and the necessary reagents, and in which a ferromagnetic ball is placed and is driven in rotation by an external magnetic field. The cup has at its lower part an annular travel path for the ball and it comprises a detection device which delivers an electric signal whenever the ball passes in front of it which is associated with a measurement unit determining the variation of the time interval between two consecutive passages of the ball.
23 Citations
5 Claims
-
1. A device for measuring the time of change of the physical state of a fluid sample comprising:
-
a container for holding the fluid sample; a ferromagnetic member positioned and arranged so as to be movable in the bottom of the container along a predetermined circular path; a driving means for generating a periodic rotating magnetic field to said ferromagnetic member which imparts to said member a sustained circular motion along said path; and a detecting means for detecting the variations of frequency of said circular motion of said ferromagnetic member during the time of change in the physical state of the fluid sample, said detecting means further comprising means for measuring the relative speed of said sustained circular motion of said ferromagnetic member and the relative speed of said periodic rotating magnetic field during the time of change of the physical state of the sample fluid, and means for comparing said measured relative speeds to provide the time of change of physical state of the sample fluid. - View Dependent Claims (2, 3, 4, 5)
-
Specification