The invention of optical fibers has revolutionized not only telecommunications but also sensing technology. Optical fiber sensors can measure strain, temperature, pressure, and many other physical parameters along the fibers, but they are currently immune to electromagnetic noise — interference from other external electric or magnetic interactions. It is a desirable trait, until the effect of the electromagnetic field on the fibers needs to be measured. Now, an international team of researchers has used what was previously considered a ‘damaged’ part of an optical fiber to develop such a magnetic field sensor.
They published details of their approach on Nov. 5 in Advanced Photonics Research.
“This nature of immunity to electromagnetic noise is a great merit when we measure strain, temperature, etc., under strong electromagnetic field environments,” said paper co-author Yosuke Mizuno, associate professor at the Faculty of Engineering, Yokohama National University. “However, it simultaneously means that electromagnetic field sensing using optical fibers is a major challenge, which we tackled in this paper.”
The researchers took advantage of a ‘fiber fuse’ effect, which is……EurekAlert!