scholarly journals Parallelised photoacoustic signal acquisition using a Fabry-Perot sensor and a camera-based interrogation scheme

2018 ◽  
Author(s):  
Taravat Saeb Gilani ◽  
Jan Laufer ◽  
Claus Villringer ◽  
Edward Z. Zhang ◽  
Heiko Gundlach ◽  
...  
Keyword(s):  
Photoacoustic Signal ◽  
Signal Acquisition ◽  
Fabry Perot

Development of tunable Fabry-Pérot polymer film sensors for parellelised photoacoustic signal acquisition (Conference Presentation)

2018 ◽  
Author(s):  
Claus Villringer ◽  
Taravat Saeb Gilani ◽  
Sara Gehauf ◽  
Clemens Wiedenhöft ◽  
Patrick Steglich ◽  
...  
Keyword(s):  
Polymer Film ◽  
Photoacoustic Signal ◽  
Signal Acquisition ◽  
Fabry Perot

scholarly journals Development of tuneable Fabry-Pérot sensors for parallelised photoacoustic signal acquisition

2019 ◽  
Author(s):  
Claus Villringer ◽  
Taravat Saeb Gilani ◽  
Edward Z. Zhang ◽  
Silvio Pulwer ◽  
Patrick Steglich ◽  
...  
Keyword(s):  
Photoacoustic Signal ◽  
Signal Acquisition ◽  
Fabry Perot

scholarly journals Adaptive optics enhanced all-optical photoacoustic tomography

2021 ◽  
Author(s):  
Jakub Czuchnowski ◽  
Robert Prevedel
Keyword(s):  
High Resolution ◽  
Image Quality ◽  
Adaptive Optics ◽  
Photoacoustic Signal ◽  
Photoacoustic Tomography ◽  
Optical Aberrations ◽  
Fabry Perot ◽  
Mammalian Tissues ◽  
All Optical

AbstractAll-optical ultrasound detection bears a number of unique advantages for photoacoustic tomography, including the ability for high resolution sampling of the acoustic field and its compatibility with a wide variety of other optical modalities. However, optical schemes based on miniaturized cavities are sensitive to optical aberrations as well as manufacturing-induced cavity imperfections which degrade sensor sensitivity and deteriorate photoacoustic image quality. Here we present an experimental method based on adaptive optics that is capable of enhancing the overall sensitivity of Fabry-Pérot based photoacoustic sensors. We experimentally observe clear improvements in photoacoustic signal detection as well as overall image quality after photoacoustic tomography reconstructions when applied to mammalian tissues in vivo.

scholarly journals Ultrasonic signal detection based on Fabry–Perot cavity sensor

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Wu Yang ◽  
Chonglei Zhang ◽  
Jiaqi Zeng ◽  
Wei Song
Keyword(s):  
Signal Detection ◽  
Photoacoustic Imaging ◽  
Mechanical Energy ◽  
Three Dimensional ◽  
Photoacoustic Signal ◽  
Outer Diameter ◽  
Ultrasonic Signals ◽  
Two Photon ◽  
The Core ◽  
Fabry Perot

AbstractAcoustic/ultrasonic sensors are devices that can convert mechanical energy into electrical signals. The Fabry–Perot cavity is processed on the end face of the double-clad fiber by a two-photon three-dimensional lithography machine. In this study, the outer diameter of the core cladding was 250 μm, the diameter of the core was 9 μm, and the microcavity sensing unit was only 30 μm. It could measure ultrasonic signals with high precision. The characteristics of the proposed ultrasonic sensor were investigated, and its feasibility was proven through experiments. Its design has a small size and can replace a larger ultrasonic detector device for photoacoustic signal detection. The sensor is applicable to the field of biomedical information technology, including medical diagnosis, photoacoustic endoscopy, and photoacoustic imaging.

scholarly journals A Novel Fabry-Pérot Optical Sensor for Guided Wave Signal Acquisition

Sensors ◽  
2020 ◽  
Vol 20 (6) ◽  
pp. 1728
Author(s):  
Cheng Xu ◽  
Zahra Sharif Khodaei
Keyword(s):  
Damage Detection ◽  
Guided Waves ◽  
Detection System ◽  
Guided Wave ◽  
Signal Acquisition ◽  
System A ◽  
Fabry Perot ◽  
Fbg Sensors ◽  
Improved Performance ◽  
New Sensors

In this paper, a novel hybrid damage detection system is proposed, which utilizes piezoelectric actuators for guided wave excitation and a new fibre optic (FO) sensor based on Fabry-Perot (FP) and Fiber Bragg Grating (FBG). By replacing the FBG sensors with FBG-based FP sensors in the hybrid damage detection system, a higher strain resolution is achieved, which results in higher damage sensitivity and higher reliability in diagnosis. To develop the novel sensor, optimum parameters such as reflectivity, a wavelength spectrum, and a sensor length were chosen carefully through an analytical model of the sensor, which has been validated with experiments. The sensitivity of the new FBG-based FP sensors was compared to FBG sensors to emphasize the superiority of the new sensors in measuring micro-strains. Lastly, the new FBG-based FP sensor was utilized for recording guided waves in a hybrid setup and compared to the conventional FBG hybrid sensor network to demonstrate their improved performance for a structural health monitoring (SHM) application.

Design and numerical analysis of high-reflective film used in F-P sapphire optical fiber high-temperature sensor

Sensor Review ◽  
2019 ◽  
Vol 39 (2) ◽  
pp. 162-170 ◽  
Author(s):  
Qijing Lin ◽  
Zirong Wu ◽  
Na Zhao ◽  
Zhuangde Jiang ◽  
Qidong Zhang ◽  
...  
Keyword(s):  
High Temperature ◽  
Numerical Analysis ◽  
Optical Fiber ◽  
Temperature Sensor ◽  
Incident Angle ◽  
Signal Acquisition ◽  
Film System ◽  
Content Type ◽  
Fabry Perot ◽  
High Temperature Sensor

PurposeThe Fabry-Perot sapphire optical fiber sensor is an excellent choice for high-temperature sensing in civil and military fields, such as oil exploitation, engine and turbine. The purpose of this paper is to study the high-reflective film system withstanding high temperature in Fabry-Perot sapphire optical fiber high-temperature sensor. To improve the performance of the sensor and reduce the difficulty of signal acquisition, one of the key ways is to enhance the normalized light intensity of F-P sensor, which can be achieved by coating the high-reflective film system on the fiber end.Design/methodology/approachThe high-reflective film system can be achieved by a multilayer film with alternating ZrO2and Al2O3film layers whose refractive indexes are different. In addition, the optimum film alternating sequences and the influence of the number of film layers, incident angle and temperature should be obtained by numerical analysis.FindingsWith the increase of the number of film layers, the reflectivity rises gradually and the change trend is more and more gentle. A minimum of the spectral reflectivity will occur at a certain incident angle depending on the design of the periodic multilayer system. Temperature affects the reflectivity of high-reflective film system. The normalized light intensity of the F-P sensor coated with high-reflective film system enhances greatly which is helpful to the signal demodulation. The temperature response of the F-P sensor is mainly determined by the characteristics of the F-P cavity.Originality/valueHigher reflectivity, lower cost and easy signal acquisition are the most important features of the introduced high-reflective film system for the Fabry-Perot sapphire optical fiber high-temperature sensor.

Diffraction de réseaux d'indice en cavité Fabry-Pérot

2000 ◽  
Vol 10 (PR8) ◽  
pp. Pr8-251
Author(s):  
L. Menez ◽  
I. Zaquine ◽  
A. Maruani ◽  
R. Frey
Keyword(s):  
Fabry Perot
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