Browsing by Author "Jha, Ajit"
Now showing items 1-13 of 13
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A nanometric displacement measurement system using differential optical feedback interferometry
(2013-11-01)
Article
Restricted access - publisher's policy -
A new method for the acquisition of arterial pulse wave using self-mixing interferometry
(2014-11-01)
Article
Open AccessIn 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
(Universitat Politècnica de Catalunya, 2016-11-25)
Doctoral thesis
Open Access
Covenantee: 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
(2018-07-01)
Article
Restricted access - publisher's policy -
Current Developments on Optical Feedback Interferometry as an All-Optical Sensor for Biomedical Applications
(2016-05-13)
Article
Open AccessOptical 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
(Institute of Electrical and Electronics Engineers (IEEE), 2021-01-01)
Article
Open AccessThe 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
(International Society for Photo-Optical Instrumentation Engineers (SPIE), 2015)
Conference report
Restricted access - publisher's policyForce 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
(2015-12-01)
Article
Open AccessThis 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-Modulated Optical Feedback Interferometry for Nanometric Scale Vibrometry
(2016-02-18)
Article
Open AccessWe 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 ... -
Microcantilever Displacement Measurement Using a Mechanically Modulated Optical Feedback Interferometer
(2016-06-29)
Article
Open AccessMicrocantilever 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
(Institute of Electrical and Electronics Engineers (IEEE), 2014)
Conference lecture
Restricted access - publisher's policyIn 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
(International Society for Photo-Optical Instrumentation Engineers (SPIE), 2015)
Conference report
Restricted access - publisher's policyThe 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
(2015)
Conference report
Open AccessEn 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 ...
