The question in the title may seem trivial, as it is a question that sooner or later, almost every kid asks. However, the answer is not so straightforward and the work of several scientists was … Read the rest
Colorimetry is the discipline that measures the colour, employing numerical values to objectively represent them [1]. In this post we will explain how we do the transition from human colour perception to an unambiguous way … Read the rest
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 … Read the rest
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 … Read the rest
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]… Read the rest
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]… Read the rest
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.
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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 … Read the rest
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].
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 … Read the rest
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 … Read the rest
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 … Read the rest
Measurement of sugar percentage or ºBrix (1 ºBrix=1% sugar mass percent) is crucial in many applications, such as fruit juice, wine making, carbonated beverage industry and the sugar industry among others.
Different … Read the rest
Periodic perturbations of the optical fiber core refractive index along the fiber length can be obtained using different techniques, such as the exposure to an intense laser irradiation, arc discharge or mechanical deformations as … Read the rest
SLED Broadband light sources can take advantage from broadband emission and high power as it is described in our previous post about SLEDs. These characteristics are very interesting in many different … Read the rest
The continuous emerging of novel manufacturing techniques, either top-down or bottom-up [1], enables a more and more precise control of the growth of structures at nanometric scale, which has motivated new and numerous applications in recent … Read the rest
In this post we will briefly go through a theoretical introduction of evanescent field associated to optical fiber sensors and its applications to perform absorption measurements.
First, it is important to … Read the rest
In one of our last articles (see article) we explained the basic principles of superluminescent diodes (SLD) operation. After understanding what means that the SLDs have a high spatial coherence and a low temporal coherence … Read the rest
In this article we are going to introduce the concept of coherence, as it plays a major role when selecting a light source for a certain application. It is always mentioned in the articles about … Read the rest
The risks associated to water contamination are very important for human health and environmental protection. Therefore, water quality monitoring is a major concern of current society. … Read the rest
Nowadays, lasers and LEDs are part of the everyday life thanks to the Star Wars lightsabers or the low consumption bulbs, although a … Read the rest
Relative measurements
Insertion loss and return loss or power signal transmitted along a fiber optic link, are generally expressed in dB (decibels) and should always be a positive number. But they can also be negative, which is not good in … Read the rest
The use of fiber optic sensors based in fluorescence measurements has become a common practice for applications of detection in areas such as analytical chemistry, biochemistry, cell biology, photochemistry, medical diagnostics or biotechnology during last decades … Read the rest
Fiber optic connector technology has evolved during the last decades aided by many technological companies and individuals aimed to obtain the best solution to minimize power loss at lower cost as well as … Read the rest
Optical fiber setups can often be very complicated and hard to be moved from laboratory to real life applications because of bulk measuring equipments or brittle optical fiber configuration.… Read the rest
When using a fiber-coupled light source, such as our COB-SERIES or FJORD, it is essential to select carefully the right fiber to use with. We all have in mind the … Read the rest
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