title: Nanosecond-resolved temperature measurements using magnetic nanoparticles.
abstract: Instantaneous and noninvasive temperature measurements are important when laser thermotherapy or welding is performed. A noninvasive nanosecond-resolved magnetic nanoparticle (MNP) temperature measurement system is described in which a transient change in temperature causes an instantaneous change in the magnetic susceptibilities of the MNPs. These transient changes in the magnetic susceptibilities are rapidly recorded using a wideband magnetic measurement system with an upper frequency limit of 0.5 GHz. The Langevin function (the thermodynamic model characterizing the MNP magnetization process) is used to obtain the temperature information. Experiments showed that the MNP DC magnetization temperature-measurement system can detect a 14.4 ns laser pulse at least. This method of measuring temperature is likely to be useful for acquiring the internal temperatures of materials irradiated with lasers, as well as in other areas of research.
authors.affiliation: School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Wenbiao
authors.initials: W
authors.lastname: Xu
authors.affiliation: School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Wenzhong
authors.initials: W
authors.lastname: Liu
authors.affiliation: School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Pu
authors.initials: P
authors.lastname: Zhang
mesh_terms: D007834:Lasers; D060526:Magnetic Fields; D058185:Magnetite Nanoparticles; D013696:Temperature; D013997:Time Factors
chemical_list: D058185:Magnetite Nanoparticles