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A lot of effort has been dedicated during the past decades to the detection of gaseous species. Precise and rapid detection of minute gas concentrations is required for many applications and it is highly relevant in many industrial fields [1]. In particular, gas sensors are widely employed in air quality monitoring, industrial process control, disease… Seguir leyendo Fiber optic gas sensors

It is several decades since the speech given by Dr. Feynmann at Caltech in 1959 where he pointed out the possibilities of nanotechology [1]. Since then, nanotechnology has provided many new solutions and unexpected advances in lots of scientific areas such as medicine, biology, defense or environment and it still applies in many others. In… Seguir leyendo Nanoparticles Matter

Corrosion can be defined in a simple way as the reaction of a material with its environment which leads to the consumption of the material or its adulteration by a component from the environment [1]. In this post we will briefly explain the existing methods to monitor corrosion by means of optical fiber sensors.   Corrosion… Seguir leyendo Optical Sensors for Corrosion Monitoring

The purpose of this post is to explain in a simple and summarized manner the several existing micro and nanostructures employed to manufacture fibre optic sensors, which are described in depth in [1]. In this post up to 10 different structures are distinguished. Each of them is defined, and their main advantages and applications are also… Seguir leyendo Micro and nanostructures in optical fibre sensors

 In this post, some basic concepts about optical fiber refractometers will be briefly explained, including their function, the different existing types and some of the main parameters that enable to characterize their performance.   A refractometer is an instrument that, as its name suggests, is used to measure the index of refraction (n), which is defined… Seguir leyendo Optical fiber refractometers

This post explores the implementation of a quality detector based on spectroscopy for raw materials in the agri-food industry and agriculture. Here, the use of statistics and artificial intelligence techniques can correlate spectroscopic data with the desired parameters.    In the case of the raw materials processed in the agri-food and agricultural industry, there is… Seguir leyendo Applications of spectroscopy in the agri-food industry

 Do you remember this dress picture (Figure 1)? It was posted and went viral in 2015, dividing the world and taking over all our feeds on social media [1]. However, while everyone was debating whether the dress was white and gold, or blue and black, this social experiment made us realise that the rest of the… Seguir leyendo Colour human perception is not a universal standard

In this post we will describe the optical techniques based on resonances that can be used for biosensor interrogation apart from the ones seen in the initial post about biosensors.   When a waveguide, such as a cladding removed optical fiber, is coated by a thin-film, the propagation of the light is affected. Therefore, there may… Seguir leyendo Optical Biosensors based on Resonances

In this post we will continue explaining some important concepts associated with biosensors (see also our previous post about biosensors), such as the specificity, the limit of detection (LOD), the dynamic range, the regeneration capability or the repeatability; that are not as simple to grasp as it may seem at first sight.   The specificity is the… Seguir leyendo Optical Biosensors – Basic Concepts

In this post we will briefly describe some of the main optical techniques applied for biosensors interrogation but first it is important to clarify what we mean when we talk about biosensors and differentiate them from biometric sensors [1].   Concerning biometric sensors, they are used to measure body parameters without using any biohazardous chemicals. Body… Seguir leyendo Optical Biosensors