Difference between revisions of "Rikesh Patel"
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===Journal publications=== | ===Journal publications=== | ||
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<bibtex> | <bibtex> | ||
| − | @ | + | @article{Hirsch2017135, |
| − | + | title = "Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture ", | |
| − | + | journal = "Additive Manufacturing ", | |
| − | + | volume = "13", | |
| − | + | number = "", | |
| − | author = | + | pages = "135 - 142", |
| − | + | year = "2017", | |
| − | + | note = "", | |
| − | keywords = | + | issn = "2214-8604", |
| − | + | doi = "http://dx.doi.org/10.1016/j.addma.2016.10.004", | |
| − | + | url = "http://www.sciencedirect.com/science/article/pii/S2214860416301877", | |
| − | + | author = "Matthias Hirsch and Rikesh Patel and Wenqi Li and Guangying Guan and Richard K. Leach and Steve D. Sharples and Adam T. Clare", | |
| − | + | keywords = "Nondestructive evaluation", | |
| − | + | keywords = "Additive manufacturing", | |
| − | + | keywords = "Process control", | |
| + | keywords = "In-situ analysis " | ||
} | } | ||
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| − | @ | + | @Article{Patel2014, Title = {Widefield two laser interferometry}, Author = {Rikesh Patel and Samuel Achamfuo-Yeboah and Roger Light and Matt Clark}, Journal = {Opt. Express}, Year = {2014}, Month = {Nov}, Number = {22}, Pages = {27094--27101}, Volume = {22}, Abstract = {A novel system has been developed that can capture the wide-field interference pattern generated by interfering two independent and incoherent laser sources. The interferograms are captured using a custom CMOS modulated light camera (MLC) which is capable of demodulating light in the megahertz region. Two stabilised HeNe lasers were constructed in order to keep the optical frequency difference (beat frequency) between the beams within the operational range of the camera.This system is based on previously reported work of an ultrastable heterodyne interferometer \&\#x0005B;Opt. Express 20, 17722 (2012)\&\#x0005D;. The system used an electronic feedback system to mix down the heterodyne signal captured at each pixel on the camera to cancel out the effects of time varying piston phase changes observed across the array. In this paper, a similar technique is used to track and negate the effects of beat frequency variations across the two laser pattern. This technique makes it possible to capture the full field interferogram caused by interfering two independent lasers even though the beat frequency is effectively random.As a demonstration of the system\&\#x02019;s widefield interferogram capture capability, an image of a phase shifting object is taken using a very simple two laser interferometer.}, Doi = {10.1364/OE.22.027094}, Keywords = {Interferometric imaging ; Interferometric imaging}, Owner = {rp}, Publisher = {OSA}, Timestamp = {2014.11.18}, Url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-22-22-27094}, pdf = { http://optics.eee.nottingham.ac.uk/w/images/4/4d/Pap4.pdf} } |
| − | + | </bibtex> | |
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| − | + | <bibtex> | |
| − | + | @ARTICLE{Patel2012, author = {Rikesh Patel and Samuel Achamfuo-Yeboah and Roger Light and Matt Clark}, title = {Ultrastable heterodyne interferometer system using a CMOS modulated light camera}, journal = {Opt. Express}, year = {2012}, volume = {20}, pages = {17722--17733}, number = {16}, month = {Jul}, abstract = {A novel ultrastable widefield interferometer is presented. This uses a modulated light camera (MLC) to capture and stabilise the interferogram in the widefield heterodyne interferometer. This system eliminates the contribution of piston phase to the interferogram without the need for common path optics and results in a highly stable widefield interferometer.The MLC uses quadrature demodulation circuitry built into each pixel to demodulate the light signal and extract phase information using an electronic reference signal. In contrast to the work previously presented \&\#x0005B;Opt. Express 19, 24546 (2011)\&\#x0005D;, the reference signal is derived from one of the pixels on board the MLC rather than an external source. This local reference signal tracks the instantaneous modulation frequency detected by the other pixels and eliminates the contribution of piston phase to the interferogram, substantially removing the contributions of unwanted vibrations and microphonics to the interferogram. Interferograms taken using the ultrastable system are presented with one of the interferometer mirrors moving at up to 85 mm s\&\#x02212;1 over a variety of frequencies from 18 Hz to 20 kHz (giving a variation in optical path length of 220 \&\#x003BC;m, or 350 wavelengths at 62 Hz). This limit was the result of complex motion in the mirror mount rather than the stability limit of the system. The system is shown to be insensitive to pure piston phase variations equivalent to an object velocity of over 3 m s\&\#x02212;1.}, doi = {10.1364/OE.20.017722}, keywords = {Interferometric imaging ; Interferometric imaging}, owner = {rp}, publisher = {OSA}, timestamp = {2013.06.03}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-20-16-17722}, pdf = {http://optics.eee.nottingham.ac.uk/w/images/0/0f/Pap3.pdf}} | |
| − | + | </bibtex> | |
| − | + | ||
| − | + | <bibtex> | |
| − | + | @inproceedings{Patel:11, | |
| − | + | author = {Rikesh Patel and Matt Clark and Samuel Achamfuo-Yeboah}, | |
| − | url = | + | booktitle = {Imaging and Applied Optics}, |
| − | author = | + | journal = {Imaging and Applied Optics}, |
| − | keywords = | + | keywords = {Interferometric imaging ; Interferometric imaging}, |
| − | + | pages = {JWA14}, | |
| − | + | publisher = {Optical Society of America}, | |
| − | + | title = {Widefield ultrastable heterodyne interferometry using a custom CMOS modulated light camera}, | |
| + | year = {2011}, | ||
| + | url = {http://www.osapublishing.org/abstract.cfm?URI=AIO-2011-JWA14}, | ||
| + | abstract = {A method of detecting optical heterodyne interferometry fringes using a custom CMOS modulated light camera array has been developed. Widefield phase images are generated using quadrature demodulation and are kept stable using a feedback system.}, | ||
} | } | ||
| + | </bibtex> | ||
| + | |||
| + | <bibtex> | ||
| + | @ARTICLE{Patel2011a, author = {Rikesh Patel and Samuel Achamfuo-Yeboah and Roger Light and Matt Clark}, title = {Widefield heterodyne interferometry using a custom CMOS modulated light camera}, journal = {Opt. Express}, year = {2011}, volume = {19}, pages = {24546--24556}, number = {24}, month = {Nov}, abstract = {In this paper a method of taking widefield heterodyne interferograms using a prototype modulated light camera is described. This custom CMOS modulated light camera (MLC) uses analogue quadrature demodulation at each pixel to output the phase and amplitude of the modulated light as DC voltages. The heterodyne interference fringe patterns are generated using an acousto-optical frequency shifter (AOFS) in an arm of a Mach-Zehnder interferometer. Widefield images of fringe patterns acquired using the prototype MLC are presented. The phase can be measured to an accuracy of {\textpm}6.6{\textdegree}. The added value of this method to acquire widefield images are discussed along with the advantages.}, doi = {10.1364/OE.19.024546}, owner = {rp}, publisher = {OSA}, timestamp = {2012.01.13}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-19-24-24546}, pdf = {http://optics.eee.nottingham.ac.uk/w/images/d/d6/Pap1.pdf}} | ||
</bibtex> | </bibtex> | ||
Revision as of 16:24, 23 March 2017
Rikesh Patel
Location
202/307 Tower, University Park
C38 SIOS Pharmacy, University Park
Phone
+44 (0)115 84-67892
rikesh.patel
Education/Posts
2004-2008 MEng Electronic and Computer Engineering (1st Class), University of Nottingham
2008-2014 PhD Electrical and Electronic Engineering (Thesis), University of Nottingham
2013-2014 Research Assistant, University of Nottingham
2014- Research Associate, University of Nottingham
Awards
- University of Nottingham interdisciplinary research funding award (UNICAS) - 2014
- Applied optics group internal research proposal review award (1st place) - 2015
Journal publications
Matthias Hirsch, Rikesh Patel, Wenqi Li, Guangying Guan, Richard K. Leach, Steve D. Sharples, Adam T. Clare - Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture
- Additive Manufacturing 13:135 - 142,2017
- http://www.sciencedirect.com/science/article/pii/S2214860416301877
BibtexAuthor : Matthias Hirsch, Rikesh Patel, Wenqi Li, Guangying Guan, Richard K. Leach, Steve D. Sharples, Adam T. Clare
Title : Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture
In : Additive Manufacturing -
Address :
Date : 2017
Richard J. Smith, Matthias Hirsch, Rikesh Patel, Wenqi Li, Adam T. Clare, Steve D. Sharples - Spatially resolved acoustic spectroscopy for selective laser melting
- Journal of Materials Processing Technology 236:93 - 102,2016
- http://www.sciencedirect.com/science/article/pii/S0924013616301352
BibtexAuthor : Richard J. Smith, Matthias Hirsch, Rikesh Patel, Wenqi Li, Adam T. Clare, Steve D. Sharples
Title : Spatially resolved acoustic spectroscopy for selective laser melting
In : Journal of Materials Processing Technology -
Address :
Date : 2016
Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark - Widefield two laser interferometry
- Opt. Express 22(22):27094--27101, Nov 2014
- http://www.opticsexpress.org/abstract.cfm?URI=oe-22-22-27094
BibtexAuthor : Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark
Title : Widefield two laser interferometry
In : Opt. Express -
Address :
Date : Nov 2014
Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark - Ultrastable heterodyne interferometer system using a CMOS modulated light camera
- Opt. Express 20(16):17722--17733, Jul 2012
- http://www.opticsexpress.org/abstract.cfm?URI=oe-20-16-17722
BibtexAuthor : Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark
Title : Ultrastable heterodyne interferometer system using a CMOS modulated light camera
In : Opt. Express -
Address :
Date : Jul 2012
Rikesh Patel, Matt Clark, Samuel Achamfuo-Yeboah - Widefield ultrastable heterodyne interferometry using a custom CMOS modulated light camera
- Imaging and Applied Optics pp. JWA14,2011
- http://www.osapublishing.org/abstract.cfm?URI=AIO-2011-JWA14
BibtexAuthor : Rikesh Patel, Matt Clark, Samuel Achamfuo-Yeboah
Title : Widefield ultrastable heterodyne interferometry using a custom CMOS modulated light camera
In : Imaging and Applied Optics -
Address :
Date : 2011
Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark - Widefield heterodyne interferometry using a custom CMOS modulated light camera
- Opt. Express 19(24):24546--24556, Nov 2011
- http://www.opticsexpress.org/abstract.cfm?URI=oe-19-24-24546
BibtexAuthor : Rikesh Patel, Samuel Achamfuo-Yeboah, Roger Light, Matt Clark
Title : Widefield heterodyne interferometry using a custom CMOS modulated light camera
In : Opt. Express -
Address :
Date : Nov 2011
Conferences
- UON Institute of Aerospace exposition, Nottingham UK - 2010
- KTP innovate event, London UK - 2011
- OSA Optics and Photonics Congress, Toronto Canada - 2011
- IOP Photon12, Durham UK - 2012
- IOP Anglo-French physical acoustic conference AFPAC2015, Frejus France - 2015
- BINDT Aerospace event 2015, Sheffield UK - 2015
- RCNDE Annual research review, Manchester UK - 2015
- 4th International Symposium on Laser Ultrasonics LU2015, Evanston IL USA - 2015
