OPTICAL MEASURING METHOD FOR MEASURING AN ELECTRICAL AC CURRENT WITH TEMPERATURE COMPENSATION AND DEVICE FOR IMPLEMENTING THE METHOD

摘要

PCT No. PCT/DE94/00252 Sec. 371 Date Sep. 29, 1995 Sec. 102(e) Date Sep. 29, 1995 PCT Filed Mar. 10, 1994 PCT Pub. No. WO94/24573 PCT Pub. Date Oct. 27, 1994In a magneto-optic method of measuring an A.C. current in a conductor, the plane of rotation of linearly polarized light is rotated through a measuring angle in a Faraday element surrounding the conductor, the angle being a measure of the current strength. This light is divided into two linearly polarized light signals, with polarization planes directed at right angles to each other, which are converted by opto-electro converters into corresponding electrical signals. The two signals are used to form a functional value that represents the temperature. This value is used, together with the first signal, to determine a temperature-compensated measuring signal for the A.C. current.