We have reviewed the humidity sensors based on ceramic materials. We first discuss the
operating principle of ceramic humidity sensors. This is followed by a section on the …

Optical fibers have been involved in the area of sensing applications for more than four
decades. Moreover, interferometric optical fiber sensors have attracted broad interest for …

The development of real-time and sensitive humidity sensors is in great demand from smart
home automation and modern public health. We hereby proposed an ultrafast and full-color …

An ultra-high sensitivity open-cavity Fabry–Perot interferometer (FPI) gas refractive index
(RI) sensor based on the photonic crystal fiber (PCF) and Vernier effect is proposed and …

Fiber-optics enable direct optical spectroscopy (from the infared to the ultraviolet; in
absorption, emission and plasmonic resonance) to be performed at inaccessible sites, over …

Optical humidity sensors have evolved through decades of research and development,
constantly adapting to new demands and challenges. The continuous growth is supported …

Fabry–Perot interferometers (FPIs) have found a multitude of scientific and industrial
applications ranging from gravitational wave detection, high-resolution spectroscopy, and …

A tunable Fabry–Pérot resonator is realized using metal–insulator–metal structure, in which
the insulator is chitosan hydrogel. The chitosan swells in response to changes in relative …

Humidity and moisture sensing is becoming increasingly important in industry and through a
wide spectrum of applications and a review of research activity in the field across a range of …

This review offers new perspectives on the subject and highlights an area in need of further
research. It includes an analysis of current scientific literature mainly covering the last …