Dr. Harish M. Manohara Profile

Dr. Harish M. Manohara

Assistant Professor at Jet Propulsion Lab

SPIE Involvement:

Author

Publications (18)

SPIE Journal Paper | 7 October 2016 Open Access

4-mm-diameter three-dimensional imaging endoscope with steerable camera for minimally invasive surgery (3-D-MARVEL)

Sam Bae, Ronald Korniski, Michael Shearn, Harish Manohara, Hrayr Shahinian

NPh, Vol. 4, Issue 01, 011008, (October 2016) https://doi.org/10.1117/12.10.1117/1.NPh.4.1.011008

KEYWORDS: Endoscopes, 3D image processing, Cameras, Imaging systems, Optical filters, Surgery, Image resolution, Staring arrays, Stereoscopy, Image filtering

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Proceedings Article | 10 April 2014 Paper

Capacitance-based damage detection sensing for aerospace structural composites

P. Bahrami, N. Yamamoto, Y. Chen, H. Manohara

Proceedings Volume 9061, 90612M (2014) https://doi.org/10.1117/12.2045160

KEYWORDS: Electrodes, Capacitance, Sensors, Damage detection, Composites, Dielectrics, Gold, Aerospace engineering, Nondestructive evaluation, Polymers

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Damage detection technology needs improvement for aerospace engineering application because detection within complex composite structures is difficult yet critical to avoid catastrophic failure. Damage detection is challenging in aerospace structures because not all the damage detection technology can cover the various defect types (delamination, fiber fracture, matrix crack etc.), or conditions (visibility, crack length size, etc.). These defect states are expected to become even more complex with future introduction of novel composites including nano-/microparticle reinforcement. Currently, non-destructive evaluation (NDE) methods with X-ray, ultrasound, or eddy current have good resolutions (< 0.1 mm), but their detection capabilities is limited by defect locations and orientations and require massive inspection devices. System health monitoring (SHM) methods are often paired with NDE technologies to signal out sensed damage, but their data collection and analysis currently requires excessive wiring and complex signal analysis. Here, we present a capacitance sensor-based, structural defect detection technology with improved sensing capability. Thin dielectric polymer layer is integrated as part of the structure; the defect in the structure directly alters the sensing layer’s capacitance, allowing full-coverage sensing capability independent of defect size, orientation or location. In this work, capacitance-based sensing capability was experimentally demonstrated with a 2D sensing layer consisting of a dielectric layer sandwiched by electrodes. These sensing layers were applied on substrate surfaces. Surface indentation damage (~1mm diameter) and its location were detected through measured capacitance changes: 1 to 250 % depending on the substrates. The damage detection sensors are light weight, and they can be conformably coated and can be part of the composite structure. Therefore it is suitable for aerospace structures such as cryogenic tanks and rocket fairings for example. The sensors can also be operating in space and harsh environment such as high temperature and vacuum.

SPIE Journal Paper | 4 October 2012

Development of a miniature single lens dual-aperture stereo imaging system towards stereo endoscopic imaging application

Sam Bae, Ronald Korniski, John Choi, Michael Shearn, Poyan Bahrami, Harish Manohara, Hrayr Shahinian

OE, Vol. 51, Issue 10, 103202, (October 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.10.103202

KEYWORDS: Prototyping, Imaging systems, Surgery, Detector arrays, Endoscopy, Channel projecting optics, Optical engineering, Human vision and color perception, Metals, Endoscopes

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SPIE Journal Paper | 7 March 2012

New technique of three-dimensional imaging through a 3-mm single lens camera

Sam Bae, Ronald Korniski, Harish Manohara, Allen Ream, Hrayr Shahinian

OE, Vol. 51, Issue 02, 021106, (March 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.2.021106

KEYWORDS: Cameras, 3D image processing, Optical filters, Stereoscopic cameras, Imaging systems, Endoscopes, 3D displays, Image filtering, Lens design, Commercial off the shelf technology

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Proceedings Article | 10 September 2011 Paper

3D imaging with a single-aperture 3-mm objective lens: concept, fabrication, and test

Ronald Korniski, Sam Bae, Michael Shearn, Harish Manohara, Hrayr Shahinian

Proceedings Volume 8129, 812904 (2011) https://doi.org/10.1117/12.894110

KEYWORDS: Commercial off the shelf technology, Objectives, Cameras, Endoscopes, Surgery, Optical filters, Imaging systems, Endoscopy, 3D image processing, Image filtering

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Proceedings Article | 17 February 2010 Paper

Carbon nanotube-based digital vacuum electronics and miniature instrumentation for space exploration

H. Manohara, R. Toda, R. Lin, A. Liao, M. Mojarradi

Proceedings Volume 7594, 75940Q (2010) https://doi.org/10.1117/12.844076

KEYWORDS: Electronics, Logic, Logic devices, Switching, Digital electronics, Carbon, X-rays, Aerospace engineering, Carbon nanotubes, Electronic components

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Proceedings Article | 12 May 2009 Paper

Power sources for micro-autonomous vehicles: challenges and prospects

S. Narayan, A. Kisor, T. Valdez, H. Manohara

Proceedings Volume 7318, 73180P (2009) https://doi.org/10.1117/12.818779

KEYWORDS: Lithium, Combustion, Liquids, Oxides, Hydrogen, Metals, Solids, Ions, Polymers, Electrodes

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Proceedings Article | 30 April 2008 Paper

Carbon nanotube vacuum gauges utilizing long, dissipative tubes

Anupama Kaul, Harish Manohara

Proceedings Volume 6959, 69590F (2008) https://doi.org/10.1117/12.779570

KEYWORDS: Single walled carbon nanotubes, Silica, Annealing, Resistance, Carbon nanotubes, Temperature metrology, Electrodes, Sensors, Microelectromechanical systems, Chromium

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Proceedings Article | 30 April 2008 Paper

Application specific electrode-integrated nanotube cathodes (ASINCs) for miniature analytical instruments for space exploration

Harish Manohara, Michael Bronikowski, Risaku Toda, Eduardo Urgiles, Robert Lin, Karl Yee, Anupama Kaul, John Hong

Proceedings Volume 6959, 695906 (2008) https://doi.org/10.1117/12.777322

KEYWORDS: X-rays, Electrodes, Carbon nanotubes, Spectroscopy, Scanning electron microscopy, Copper, Photomicroscopy, Aerospace engineering, Commercial off the shelf technology, Sputter deposition

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Proceedings Article | 23 December 2003 Paper

Field emission testing of carbon nanotubes for THz frequency vacuum microtube sources

Harish Manohara, Wei Lien Dang, Peter Siegel, Michael Hoenk, Ali Husain, Axel Scherer

Proceedings Volume 5343, (2003) https://doi.org/10.1117/12.531403

KEYWORDS: Carbon nanotubes, Single walled carbon nanotubes, Terahertz radiation, Silicon, Chemical vapor deposition, Semiconducting wafers, Electron beams, Fabrication, Carbon, Nanostructuring

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Proceedings Article | 16 August 2001 Paper

Massive replication of polymeric high-aspect-ratio microstructures using PDMS casting

Sangwon Park, Kabseog Kim, Harish Manohara, Jeong-Bong Lee

Proceedings Volume 4334, (2001) https://doi.org/10.1117/12.436611

KEYWORDS: Silicon, Nickel, Polymers, Microelectromechanical systems, Scanning electron microscopy, Photomicroscopy, Photoresist materials, Glasses, Plasma etching, Electroplating

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Proceedings Article | 21 June 2000 Paper

New technique for direct integration of mechanical motion with electronics on a chip

Pratul Ajmera, Xiaodong Wang, James Ross, Giri Nallapati, Harish Manohara

Proceedings Volume 3990, (2000) https://doi.org/10.1117/12.388904

KEYWORDS: Field effect transistors, Electronics, Transistors, Actuators, Plating, Oxides, Electrodes, Capacitance, Photomasks, Etching

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Proceedings Article | 10 April 2000 Paper

Preliminary results at the ultradeep x-ray lithography beamline at CAMD

Georg Aigeldinger, Philip Coane, Benjamin Craft, Jost Goettert, Sam Ledger, Zhong Ling, Harish Manohara, Louis Rupp

Proceedings Volume 4019, (2000) https://doi.org/10.1117/12.382294

KEYWORDS: Photomasks, Polymethylmethacrylate, X-ray lithography, X-rays, Gold, Beryllium, Optical filters, Scanning electron microscopy, Teeth, Microfabrication

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Proceedings Article | 2 September 1997 Paper

Analysis and enhancement of bond strength of acrylic sheets to metallic substrates for use in LIGA-type processing

Supipta Das, Harish Manohara, Chantal Khan Malek

Proceedings Volume 3225, (1997) https://doi.org/10.1117/12.284544

KEYWORDS: Polymethylmethacrylate, Photoresist materials, Polymerization, Copper, Titanium, Annealing, Interfaces, Analytical research, Oxidation

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Proceedings Article | 7 July 1997 Paper

Power measurements of exposure radiation using thin metal film sensors

Harish Manohara, Kevin Morris, J. Michael Klopf, Gina Calderon, Jason Babin, Olga Vladimirsky, Yuli Vladimirsky

Proceedings Volume 3048, (1997) https://doi.org/10.1117/12.275791

KEYWORDS: Infrared sensors, Sensors, Thin films, Gold, Synchrotrons, Metals, Calibration, Optical testing, Resistance, Optical lithography

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Proceedings Article | 13 September 1996 Paper

Temperature rise in thick PMMA resists during x-ray exposure

Harish Manohara, Gina Calderon, J. Michael Klopf, Kevin Morris, Olga Vladimirsky, Yuli Vladimirsky

Proceedings Volume 2880, (1996) https://doi.org/10.1117/12.250950

KEYWORDS: Polymethylmethacrylate, Temperature metrology, Infrared sensors, X-rays, Helium, Photomasks, Gold, Sensors, Silicon, Semiconducting wafers

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Proceedings Article | 27 May 1996 Paper

Thick PMMA layer formation as an x-ray imaging medium for micromachining

Olga Vladimirsky, Gina Calderon, Yuli Vladimirsky, Harish Manohara

Proceedings Volume 2723, (1996) https://doi.org/10.1117/12.240489

KEYWORDS: Polymethylmethacrylate, Solids, Silicon, Coating, Image acquisition, Micromachining, X-ray imaging, Imaging systems, Interfaces, Scanning electron microscopy

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