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
Sugar content (°Brix) measurement using fiber optic refractometers
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
Fiber Bragg Gratings – Propagation phenomena
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
Broadband light source interferometry
The continuous emerging of novel manufacturing techniques, either top-down or bottom-up , 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
The role of evanescent field in optical fiber sensing
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
Light coherence, an elusive concept
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