Dr Robin Cornelius, CTO at Hirst presents the latest results from the generation 8 PFM (Pulsed Field Magnetometer) at The Magnetics Show Europe, Amsterdam 3-4th Dec 2024 in a talk entitled “25 years of industrial PFMs” on the UK MagSoc stage at the conference. This joint presentation was a collaboration between Hirst Magnetic Instruments Ltd and The National Institute of Metrology (NIM), Beijing and covered the latest results, demonstrating that generation 8 PFMs can give permeameter-like measurements for the highest grades of magnets to within 1% on permeameter reference measurements.
The 8th generation of PFMs from Hirst uniquely feature the eddy current correction (patented F-2F algorithm), Self-Demagnetisation Field (SDF) correction function (to allow accurate measurement of a wide range of samples from cylinders, cuboids and arbitrary sample shapes), and Hirst proprietary Self De-magnetisation Field Function SDFF™ (patented) which accurately generates an open to closed circuit mapping (O2C™). The first generation of Hirst industrial PFM was launched in 1998 and the company won an Institute of Physics business award for the SDFF™ technology in 2020. Thus generation 8 PFMs give permeameter-like measurements for the highest grades of magnets to within 1% on permeameter reference measurements. HirstLab v2.0 software and Hirst proprietary SDFF™ technology has been implemented in collaboration with the National Institute of Metrology (NIM), Beijing, as part of a contract for the first 8th generation PFM placed by NIM.