Results 271 to 280 of about 36,597 (305)

Dual modality reflection mode optical coherence and photoacoustic microscopy using an akinetic sensor

Optics Letters, 2017
This Letter presents a novel dual modality reflection mode optical coherence and photoacoustic microscopy (OC-PAM) system. The optical coherence microscopy modality features a broadband source to accomplish 5 μm axial resolution. The photoacoustic microscopy modality uses a rigid akinetic Fabry-Perot etalon encapsulated in an optically transparent ...
Haindl, Richard, Preisser, Stefan, Andreana, Marco, Rohringer, Wolfgang, Sturtzel, Caterina, Distel, Martin, Chen, Zhe, Rank, Elisabet, Fischer, Balthasar, Drexler, Wolfgang, Liu, Mengyang   +10 more
openaire   +2 more sources

Implementation of IR sensors in thru-beam and diffuse-reflective modes for obstacle detection

2017 International Symposium on Wireless Systems and Networks (ISWSN), 2017
The field of obstacle detection is very popular and vast these days. Lot of technologies has been developed for obstacle-detection phenomenon in recent years. Sensors are the main entity in these technologies. Systems' ability to detect an object, sensitivity, range, cost and quality, all are dependent on the fact that which type of sensors are being ...
Asfa Javed, Hassan Tariq, Abdullah Khalid   +2 more
openaire   +1 more source

Non-invasive hemoglobin concentration measurements with multi-wavelength reflectance mode PPG sensor and CNN data processing*

2023 45th Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC), 2023
Possibility of non-invasive hemoglobin concentration measurements with wearable devices have been evaluated. The proposed solution is based on the assumption that PPG waveform shape measured at various wavelengths in the reflectance mode carries information about in-depth distribution of optical pathlength in the tissue.
Vladislav V. Lychagov, Vladimir M. Semenov, Elena Volkova, Dmitrii I. Chernakov, Joongwoo Ahn, Justin Younghyun Kim   +5 more
openaire   +2 more sources

Toward a Low-Cost Portable Reader for Reflective-Mode Microwave Sensors

IEEE Transactions on Instrumentation and Measurement
Microwave sensors are typically characterized using a vector network analyzer (VNA) that measures the scattering parameters of the device under test (DUT) over a wide frequency band with great accuracy. However, these features of the VNA are not always required, and its bulky form factor and high cost can even be a limitation in many practical ...
Mahmoud Elgeziry, Filippo Costa, Paris Vélez, Ferran Paredes, Ferran Martín, Simone Genovesi   +5 more
openaire   +3 more sources

Reflection mode two-dimensional photonic-crystal-slab-waveguide-based micropressure sensor

SPIE Proceedings, 2011
Photonic crystals (PhCs) have recently been the focus for the developing micro- and nano-optical sensors, due to its capability to control and manipulate light on planar devices. This paper presents a novel design of micro-optical pressure sensor based on 2-dimensional PhC slab suspended on Si substrate.
Yi Wang, Aref Bakhtazad, Jayshri Sabarinathan   +2 more
openaire   +1 more source

Effects of Losses on the Sensitivity of Reflective-Mode Phase-Variation Liquid Sensors

IEEE Transactions on Microwave Theory and Techniques
This article is focused on the analysis of the effects of losses on the sensitivity of reflective-mode phase-variation liquid sensors implemented by means of an open-ended (either quarter-wavelength or half-wavelength) transmission line distributed resonator (the sensing element) cascaded to a set of high/low impedance inverters (implemented by means ...
Paris Vélez, Xavier Canalias, Jonathan Muñoz-Enano, Pau Casacuberta, Lijuan Su, Ferran Martín   +5 more
openaire   +3 more sources

Imaging of pipeline irregularities using a PIG system based on reflection mode ultrasonic sensors

International Journal of Oil, Gas and Coal Technology, 2019
Natural gas transmission pipelines age after a certain duration and are prone to internal anomalies due to the presence of carbon dioxide and hydrogen sulphide in the natural gas constituents. An intelligent pipeline inspection gauge (PIG) is one method that is used to evaluate pipeline integrity, particularly damage resulting from corrosion threats ...
Idroas, M., Abd. Aziz, M. A. F., Zakaria, Z., Ibrahim, M. N.   +3 more
openaire   +2 more sources

Dual modality reflection mode optical coherence and photoacoustic microscopy using an akinetic sensor: publisher’s note

Optics Letters, 2018
This publisher's note corrects an error in the funding section in Opt. Lett.42, 4319 (2017)OPLEDP0146-959210.1364/OL.42.004319.
Richard, Haindl, Stefan, Preisser, Marco, Andreana, Wolfgang, Rohringer, Caterina, Sturtzel, Martin, Distel, Zhe, Chen, Elisabet, Rank, Balthasar, Fischer, Wolfgang, Drexler, Mengyang, Liu   +10 more
openaire   +2 more sources

Self-Referencing Technique in Reflection Mode for Fibre-Optic Intensity Sensors Using Ring Resonators

Optical Fiber Sensors, 2006
A new self-referencing technique in reflection configuration for remote fiber-optic intensity sensors is reported and experimentally tested. Sensor sensitivity doubles and a single down lead fibre is used. Sensor is interrogated at two subcarrier frequencies.
Carmen Vázquez, Julio Montalvo, P C. Lallana, D S. Montero   +3 more
openaire   +1 more source

A Microwave Microfluidic Reflective-Mode Phase-Variation Sensor

2021 IEEE Sensors, 2021
Paris Vélez, Cristian Herrojo, Xavi Illa, Rosa Villa, Jonathan Muñoz-Enano, Lijuan Su, Pau Casacuberta, Marta Gil, Ferran Martín   +8 more
openaire   +1 more source