12 documents found, page 1 of 2

A century on diameter measurement techniques in cylindrical structures

This work addresses the historical development of techniques and methodologies oriented to the measurement of the internal diameter of transparent tubes since the original contributions of Anderson and Barr published in 1923 in the first issue of Measurement Science and Technology. The progresses on this field are summarized and highlighted the emergence and significance of the measurement approaches supported ...

Preface, [to 2020 Annual Meeting of the European Optical Society, EOSAM2020]

Discrimination of Benign and Malignant Lesions in Canine Mammary Tissue Samples...

Breast cancer is a health problem that affects individual life quality and the family system. It is the most frequent type of cancer in women, but men are also affected. As an integrative approach, comparative oncology offers an opportunity to learn more about natural cancers in different species. Methods based on Raman spectroscopy have shown significant potential in the study of the human breast through the f...

Detection of the crystallization process of paracetamol with a multi-mode optic...

A configuration of a refractometer sensor is described with the aim of optically detecting the crystallization process of paracetamol. The developed sensing head is based on a conventional cleaved multi-mode fiber. The fiber tip sensor structure was submitted to contact with the liquid of interest (paracetamol fully dissolved in 40% v/v of ethanol/water) and the crystallization process of paracetamol, induced w...

Medição in vivo da pressão intradiscal numa ovelha com recurso a um sensor em f...

The purpose of the present study was to measure the intradiscal pressure signal of an anesthetized sheep under spontaneous breathing. An ultra-miniature fiber optic high- pressure sensor was implanted into the nucleus pulposus of the fifth lumbar intervertebral using a dorsolateral transforaminal approach. Results suggested the periodicity of the intradiscal pressure signal was similar to the mean respiratory r...

Medição in vivo da pressão intradiscal numa ovelha com recurso a um sensor em f...

Foi desenvolvido um sistema sensor para medir a pressão intradiscal numa ovelha anestesiada e sob respiração espontânea. O sistema incluiu um sensor de pressão em fibra ótica e para a sua interrogação construiu-se um sistema baseado em modulação por intensidade. O sensor foi implantado no núcleo pulposo do 5º disco lombar através de uma abordagem minimamente invasiva e sob controlo fluoroscópico. Desse modo foi...

Review of fiber-optic pressure sensors for biomedical and biomechanical applica...

As optical fibers revolutionize the way data is carried in telecommunications, the same is happening in the world of sensing. Fiber-optic sensors (FOS) rely on the principle of changing the properties of light that propagate in the fiber due to the effect of a specific physical or chemical parameter. We demonstrate the potentialities of this sensing concept to assess pressure in biomedical and biomechanical app...

Optical Current Sensors for High Power Systems: A Review

The intrinsic advantages of optical sensor technology are very appealing for high voltage applications and can become a valuable asset in a new generation of smart grids. In this paper the authors present a review of optical sensors technologies for electrical current metering in high voltage applications. A brief historical overview is given together with a more detailed focus on recent developments. Technolog...

Temperature-independent torsion sensor based on “figure-of-eight” fiber loop mi...

An interrogation sensor system combining the “figure-of-eight” fiber loop mirror using a single directional 3×3 fiber optic coupler was proposed. One fiber loop mirror was formed by inserting a length of high birefringent optical fiber at the input ports of the 3×3 coupler. Splicing the output ports of the 3×3 coupler between them created the other fiber loop mirror. The introduction of this second loop gave ri...

Suspended-core fibers for sensing applications

A brief review on suspended-core fibers for sensing applications is presented. A historical overview over the previous ten years about this special designed microstructure optical fiber is described. This fiber presents attractive optical properties for chemical/biological or gas measurement, but it can be further explored for alternative sensing solutions, namely, in-fiber interferometers based on the suspende...