Method and device for measuring the thickness of a lubricant film.

摘要

The improvement consists therein that a lubricant film can be measured in the 0.1-20 micron area with a high degree of accuracy. Thereto, between two rotating parts i.e. the shaft (1) and the seal (2), a lubricant film (3) is present whereby in the shaft a sensor (4) with an annular core (5) is applied. A coil (6) is arranged around the core (5). At the outward extension of the core polar pieces (7,8) are located which free ends are directed to the lubricant film to be measured. When an alternating current is supplied to the core (6) a magnetic field is generated which field lines are indicated by dotted lines (10). By adding magnetic particles to the lubricant it will acquire much greater magnetic permeability than air so that the magnetic field will much more be concentrated in the lubricant film.