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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 ºBrix sensors have been proposed for use in several areas, including industrial process monitoring, quality control in the food industry or biomedical… Poursuivre la lecture Sugar content (°Brix) measurement using fiber optic refractometers

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 it was also mentioned in one of our previous post about long period fiber gratings (LPFGs). This post will not be focused on the fabrication… Poursuivre la lecture Fiber Bragg Gratings – Propagation phenomena

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 applications and particularly for Long Period Fiber Grating (LPFG) interrogation and monitoring as it is mentioned here.   LPFGs periodic structures were developed in parallel to… Poursuivre la lecture LPFG Inscription Monitoring using SLED Broadband Light Source

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 decades [2].   Particularly, the use of these novel manufacturing techniques for the fabrication of sensitive structures on fiber… Poursuivre la lecture Broadband light source interferometry

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 introduce the term of total internal reflection (TIR). TIR, consists of an optical phenomenon that occurs when a light beam hits the interface… Poursuivre la lecture The role of evanescent field in optical fiber sensing

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 (see article), we can study their applications. Nowadays, the most important ones are the following:   Optical coherence tomography (OCT):   Is a high-resolution (µm… Poursuivre la lecture Superluminescent diodes (SLD/SLED) applications

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 light sources in the domain of fiber optics but it isn’t clearly explained most of the times. Although it isn’t… Poursuivre la lecture Light coherence, an elusive concept

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. In this sense, the efforts of the last years have been dedicated to the development of fast, sensitive, and selective sensors for the detection of heavy metal ions. Among… Poursuivre la lecture Fiber optic fluorescent sensors heavy metal ions

Superluminescent diode (SLD/SLED) lighting principles unveiled Nowadays, lasers and LEDs are part of the everyday life thanks to the Star Wars lightsabers or the low consumption bulbs, although a non specialized public will find difficult to explain accurately the difference between both. Nevertheless, if you google SLED without any reference to optoelectronics, the result will be related… Poursuivre la lecture SLD lighting principles unveiled

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 terms of optical communications but could be useful for other applications.   Let’s clarify the meaning between… Poursuivre la lecture Relative measurements