Contactless temp. monitoring system for ferromagnetic vehicle brake disc - measures temp. dependent permeability in air gap of transformer, with min. permeability larger than one below Curie temp. and threshold permeability between min. and one, and compares actual and threshold values.

摘要

The arrangement, which generates a magnetic field, measures the temp. dependent permeability of the body or a related parameter. The Curie temp. of the material lies within the measurement temp. range. The minimum permeability value in the range below the Curie temp. is greater than 1. A threshold defined between the actual minimum value and 1 is used for comparison with the measured value to produce a switching signal. The measurement body is placed in the air gap of a transformer forming part of the measurement arrangement. ADVANTAGE - For monitoring temp. of ferromagnetic body. Simple and enables detection of when body temp. reached threshold value.