Exploració per autor "Jha, Ajit"
Ara es mostren els items 1-15 de 15
-
A nanometric displacement measurement system using differential optical feedback interferometry
Azcona Guerrero, Francisco Javier; Atashkhooei, Reza; Royo Royo, Santiago; Méndez Astudillo, Jorge; Jha, Ajit (2013-11-01)
Article
Accés restringit per política de l'editorial -
A new method for the acquisition of arterial pulse wave using self-mixing interferometry
Arasanz Tena, Andrés; Azcona Guerrero, Francisco Javier; Royo Royo, Santiago; Jha, Ajit; Pladellorens Mallofré, Josep (2014-11-01)
Article
Accés obertIn this paper we present a technique based on self-mixing interferometry as a method for the acquisition and reconstruction of the arterial pulse wave. A modification of the classic fringe counting reconstruction algorithm ... -
Continuous wave frequency modulated optical feedback (CWFM-OF) : theory and applications
Jha, Ajit (Universitat Politècnica de Catalunya, 2016-11-25)
Tesi
Accés obert
Realitzat a/amb: Karlsruher Institut für TechnologieDiese Arbeit soll einen Beitrag leisten zur Entwicklung neuer Sensorstrategien, basierend auf Phänomenen der optischer Rückkopplung, in Kombination mit die Intensitätsmodulation des Lasers. Optische Rückkopplung, ein ... -
Cost-effective laser feedback sensor for nanometric scale acoustic perturbations
Jha, Ajit; Azcona Guerrero, Francisco Javier; Royo Royo, Santiago (2018-07-01)
Article
Accés restringit per política de l'editorial -
Current Developments on Optical Feedback Interferometry as an All-Optical Sensor for Biomedical Applications
Perchoux, Julien; Quotb, Adam; Atashkhooei, Reza; Azcona Guerrero, Francisco Javier; Ramírez Miquet, Evelio E.; Bernal, Olivier; Jha, Ajit; Luna Arriaga, Antonio; Yáñez Alvarado, Carlos René; Caum Aregay, Jesús; Bosch, Thierry; Royo Royo, Santiago (2016-05-13)
Article
Accés obertOptical feedback interferometry (OFI) sensors are experiencing a consistent increase in their applications to biosensing due to their contactless nature, low cost and compactness, features that fit very well with current ... -
Current modulation induced stability in laser diode under high optical feedback strength
Jha, Ajit; Kumar Shah, Manoj; Jha, Sachin; Reddy Cenkeramaddi, Linga; Royo Royo, Santiago (Institute of Electrical and Electronics Engineers (IEEE), 2021-01-01)
Article
Accés obertThe back-reflection of emitted laser beam (optical feedback, also know as selfmixing) from various external interfaces are sufficient to cause instability, and prohibiting its use in various fields such as communication, ... -
Differential self-mixing interferometry for micro-cantilever motion sensing
Azcona Guerrero, Francisco Javier; Jha, Ajit; Yáñez, Carlos; Royo Royo, Santiago (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2015)
Text en actes de congrés
Accés restringit per política de l'editorialForce sensing is a common practice used for the characterization of matter properties and in particular of bio-materials. Different optical methods have been used in the past to allow high resolution force measurements ... -
Extraction of vibration parameters from optical feedback interferometry signals using wavelets
Jha, Ajit; Azcona Guerrero, Francisco Javier; Yáñez Alvarado, Carlos René; Royo Royo, Santiago (2015-12-01)
Article
Accés obertThis paper proposes the use of the wavelet transform as a technique that is suited for fringe detection and analysis of optical feedback interferometry (OFI) signals, thus allowing the retrieval of extremely small physical ... -
Frequency domain analysis and filter design of continuous wave frequency modulated optical feedback signal for photonic sensing
Jha, Ajit; Cenkeramadi, Linga Reddy; Royo Royo, Santiago (Institute of Electrical and Electronics Engineers (IEEE), 2022)
Comunicació de congrés
Accés restringit per política de l'editorialOptical feedback (OF) refers to the beating of the frequency shifted back reflected laser emission from the remote (vibrating) object with that of incident radiation in the laser cavity cause rapid fluctuation of the laser ... -
Frequency-Modulated Optical Feedback Interferometry for Nanometric Scale Vibrometry
Jha, Ajit; Azcona Guerrero, Francisco Javier; Royo Royo, Santiago (2016-02-18)
Article
Accés obertWe demonstrate a novel method that makes an efficient use of laser nonlinear dynamics when subject to optical self-injection for subwavelength displacement sensing purposes. The proposed methodology combines two different ... -
Generalized multi-cavity laser self-mixing interferometry based on scattering theory
Jha, Ajit; Cenkeramadi, Linga Reddy; Royo Royo, Santiago (Optical Society of American (OSA), 2023-05-08)
Article
Accés obertWe present a generalized mathematical model and algorithm for the multi-cavity self-mixing phenomenon based on scattering theory. Scattering theory, which is extensively used for travelling wave is exploited to demonstrate ... -
Microcantilever Displacement Measurement Using a Mechanically Modulated Optical Feedback Interferometer
Azcona Guerrero, Francisco Javier; Jha, Ajit; Yáñez Alvarado, Carlos René; Atashkhooei, Reza; Royo Royo, Santiago (2016-06-29)
Article
Accés obertMicrocantilever motion detection is a useful tool for the characterization of the physical, chemical and biological properties of materials. In the past, different approaches have been proposed and tested to enhance the ... -
Towards atomic force microscopy measurements using differential self-mixing interferometry
Azcona Guerrero, Francisco Javier; Royo Royo, Santiago; Jha, Ajit (Institute of Electrical and Electronics Engineers (IEEE), 2014)
Comunicació de congrés
Accés restringit per política de l'editorialIn this paper, we explore the possibility of joining two measurement techniques that share a similar time frame and that are interested in describing the properties of materials through the study of the micro and ... -
Ultracompact vibrometry measurement with nanometric accuracy using optical feedback
Jha, Ajit; Azcona Guerrero, Francisco Javier; Royo Royo, Santiago (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2015)
Text en actes de congrés
Accés restringit per política de l'editorialThe nonlinear dynamics of a semiconductor laser with optical feedback (OF) combined with direct current modulation of the laser is demonstrated to suffice for the measurement of subwavelength changes in the position of a ... -
Vibrometría de alta resolución utilizando interferometría óptica retroalimentada diferencial por modulación electrónica
Jha, Ajit; Azcona Guerrero, Francisco Javier; Yáñez Alvarado, Carlos René; Royo Royo, Santiago (2015)
Text en actes de congrés
Accés obertEn este artículo presentamos un nuevo método para la medición de desplazamientos con amplitud de movimiento inferior a media longitud de onda láser. El método propuesto está basado en la inducción de modulación sobre la ...