Optical coherence tomography for shape and radius of curvature measurements of deeply curved machined metallic surfaces: a comparison with two-beam laser interferometry

Rao, K. Divakar; Udupa, D. V.; Prathap, Chilakala; Rathod, Ashwin; Balasubramaniam, R.; Sahoo, N. K.

doi:10.1016/j.optlaseng.2014.09.012

Cited by 16 publications

(3 citation statements)

References 18 publications

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“…The detailed protocol of the experiment can be found in ref. [35]. In this experiment, photons scattered due to impinging of light on the sample surface are detected and fed to the lock-in amplifier, which is able to detect signals > 50 µV with a preamplification of 1000.…”

Section: Instrument Demonstrationmentioning

confidence: 99%

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An FPGA based all-in-one function generator, lock-in amplifier and auto-relockable PID system

et al. 2019

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We report an all-in-one waveform generator, lock-in amplifier and Proportional-Integral-Differential (PID) controller, embedded in a single Field Programmable Gate Array (FPGA). The PID controller is advanced with a novel automatic relocking mechanism, which is capable of self-finding and relocking at the desired setpoint upon unlocking of the PID due to disturbances. The instrument is designed in such a way that these devices can either be used individually or simultaneously. Digital implementation via software processing of the associated modules is used and the firmware is embedded in an FPGA IC, which makes it compact and reconfigurable. The instrument consists of a hardware for establishing external linkage and a Python based computer-controlled interface to control it from a remote PC as well as for acquiring and plotting relevant data. A steep roll-off of the filters (6 dB/octave to 24 dB/octave), low noise density (30 nV/√Hz @ 100 kHz) in the lock-in amplifier and a PID bandwidth of 100 kHz makes it useful for wide range of applications. Versatility of the instrument is demonstrated in three different experiments, (i) Auger electron spectroscopy, (ii) low coherence optical tomography and (iii) laser frequency stabilization followed by self identification of the setpoint upon unlocking and automatic relocking to that.

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Section: Instrument Demonstrationmentioning

confidence: 99%

“…The demodulated output after the lock-in amplifier is shown in figure 6(b), which is used to reconstruct the surface image as described in ref. [35].…”

Section: Instrument Demonstrationmentioning

confidence: 99%

An FPGA based all-in-one function generator, lock-in amplifier and auto-relockable PID system

et al. 2019

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“…En el mecanizado de materiales metálicos, uno de los criterios más importantes relacionados con la calidad del proceso y de la pieza trabajada es el acabado superficial obtenido, y depende en alto grado de los parámetros del corte, las propiedades de la herramienta, las características del material a trabajar, y la interacción entre estos factores (Halila et al, 2014;Ryan et al, 2015;Divakar et al, 2015). Buriles, brocas, fresas y otras herramientas de corte, al ser elaboradas por materiales con buenas propiedades, son utilizadas en los procesos de fabricación mediante el mecanizado por arranque de viruta, al permitir realizar desbastes y maquinar los productos (Nayak et al, 2014y Vogtel et al, 2014.…”

Section: Introductionunclassified

Mecanizado de Acero AISI1020, Utilizando Buriles con Recubrimiento Monocapa de Nitruro de Vanadio

2017

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Pressure tube replica imaging system for PHWR reactors based on optical coherence tomography

Goud

Shinde

Kamath

et al. 2023

Annals of Nuclear Energy

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Optical coherence tomography for shape and radius of curvature measurements of deeply curved machined metallic surfaces: a comparison with two-beam laser interferometry

Cited by 16 publications

References 18 publications

An FPGA based all-in-one function generator, lock-in amplifier and auto-relockable PID system

An FPGA based all-in-one function generator, lock-in amplifier and auto-relockable PID system

Mecanizado de Acero AISI1020, Utilizando Buriles con Recubrimiento Monocapa de Nitruro de Vanadio

Pressure tube replica imaging system for PHWR reactors based on optical coherence tomography

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