Optical fibre-based sensor technology for humidity and moisture measurement: Review of recent progress

Alwis, Lourdes S. M.; Sun, Tao; Grattan, K. T. V.

doi:10.1016/j.measurement.2013.07.030

Cited by 244 publications

(127 citation statements)

References 136 publications

Supporting

Mentioning

116

Contrasting

Order By: Relevance

“…Various types of humidity sensors such as capacitivetype [155,156], resistive-type [157][158][159][160], optical-type [161] and acoustic-type sensors [162] have been designed. The capacitive-type sensors, which are commonly composed of an active material film and electrodes, generally possess combined features of low power consumption, good linearity and excellent stability.…”

Section: Flexible Humidity Sensorsmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

View full text Add to dashboard Cite

Flexible and wearable sensors have drawn extensive concern due to their wide potential applications in wearable electronics and intelligent robots. Flexible sensors with high sensitivity, good flexibility, and excellent stability are highly desirable for monitoring human biomedical signals, movements and the environment. The active materials and the device structures are the keys to achieve high performance. Carbon nanomaterials, including carbon nanotubes (CNTs), graphene, carbon black and carbon nanofibers, are one of the most commonly used active materials for the fabrication of high-performance flexible sensors due to their superior properties. Especially, CNTs and graphene can be assembled into various multi-scaled macroscopic structures, including one dimensional fibers, two dimensional films and three dimensional architectures, endowing the facile design of flexible sensors for wide practical applications. In addition, the hybrid structured carbon materials derived from natural bio-materials also showed a bright prospect for applications in flexible sensors. This review provides a comprehensive presentation of flexible and wearable sensors based on the above various carbon materials. Following a brief introduction of flexible sensors and carbon materials, the fundamentals of typical flexible sensors, such as strain sensors, pressure sensors, temperature sensors and humidity sensors, are presented. Then, the latest progress of flexible sensors based on carbon materials, including the fabrication processes, performance and applications, are summarized. Finally, the remaining major challenges of carbon-based flexible electronics are discussed and the future research directions are proposed. [56,57], have been used as the active components for the fabrication of flexible sensors. Among these materials, metal NPs can be used to fabricate flexible sensors with high sensitivity, but the sensing range and stretchability of these sensors are limited [58]. Besides, due to the limited chemical stability and reproducibility of metal nanowires, it is challenging to fabricate stable sensors using metal nanowires [10]. Similarly, conductive polymers with poor stability and conductivity are also difficult to be used for the fabrication of high-performance sensors [59]. In contrast, carbon materials are one of the most commonly investigated materials, especially CNTs and graphene (including graphene oxide (GO) and reduced graphene oxide (rGO)), due to their remarkable mechanical, electrical and thermal properties. To implement macroscopic applications, CNTs and graphene with superior properties in microscopic level should be converted into macroscopic functional assemblies, such as one dimensional (1D) fibers or yarns [60,61], two dimensional (2D) films or sheets [62,63], three dimensional (3D) architectures [64][65][66] (Fig. 1). The multi-scaled macroscopic carbon nanomaterials endow the flexible sensors with high sensitivity, excellent flexibility and good stability as well as desired configurations. Also, lo...

show abstract

Section: Flexible Humidity Sensorsmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In the last few decades, different types of electrochemical and optical systems for corrosion monitoring have been developed. The high interest in optical sensors has led to the publication of several review articles in recent years [61,[224][225][226][227][228][229]. Fiber-optical sensors (FOS) are small, lightweight, robust, corrosion resistant, immune to electro-magnetic interference, highly sensitive and can be tuned to detect different signals.…”

Section: Future and Research Challenges Of Sensors For Corrosion Monimentioning

confidence: 99%

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Figueira¹

2017

Applied Sciences

View full text Add to dashboard Cite

Several methods for corrosion monitoring of reinforced concrete structures (RCS) have been proposed in the last few decades. These systems may be used either in new, existing or repaired structures. The corrosion monitoring can be performed by different methodologies. These may or may not be destructive, use different degrees of complexity and cost, and provide information on the progression and kinetics of the corrosion phenomena. The destructive methods are limited to sampling. Therefore, these may not be representative of the whole structure, which is extremely important in RCS with large heterogeneities both in terms of materials used and in terms of the exposure environment. Within this context, non-destructive methods have been widely developed, which are intended to provide quick information about the entire structure. Ideally, these systems should be able to detect the corrosion state of the steel inside the concrete, the main causes of corrosion and the evolution of corrosion phenomena over time. This manuscript reviews and summarizes the actual state of the art and the main achievements in the field of electrochemical sensors based on non-destructive methods for corrosion monitoring of RCS in the last few years. The challenges and perspectives in this field will also be discussed.

show abstract

“…Conductivity is an important physical parameter of solid, liquid and organism, which has been widely used in chemical industry, metallurgy, biology, medicine, food and water and other production and scientific research departments [1][2][3][4]. According to the relative position detection element and the measured solution conductivity measurement is divided into non-contact measurement and contact measurement in two categories.…”

Section: Introductionmentioning

confidence: 99%