Rikesh Patel
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View article: Conversion between longitudinal and shear waves at normal incidence using tailored meta-structures
Conversion between longitudinal and shear waves at normal incidence using tailored meta-structures Open
The ability to manipulate elastic waves and achieve efficient mode conversion is important for many applications including energy harvesting, vibration mitigation and elastic wave control. In this paper, we present a novel metamaterial-bas…
View article: Noncontact measurement of bolt axial force during tightening processes using scattered laser ultrasonic waves
Noncontact measurement of bolt axial force during tightening processes using scattered laser ultrasonic waves Open
This paper presents a new methodology for noncontact measurement of the axial force of bolts in their tightening processes using laser-generated ultrasound waves. This method employs ultrasound waves scattered in a bolt shaft to detect axi…
View article: Imaging Microstructure on Optically Rough Surfaces Using Spatially Resolved Acoustic Spectroscopy
Imaging Microstructure on Optically Rough Surfaces Using Spatially Resolved Acoustic Spectroscopy Open
The microstructure of a material defines many of its mechanical properties. Tracking the microstructure of parts during their manufacturing is needed to ensure the designed performance can be obtained, especially for additively manufacture…
View article: Measurement of the single crystal elasticity matrix of polycrystalline materials
Measurement of the single crystal elasticity matrix of polycrystalline materials Open
Many engineering metals are polycrystalline, as such the elasticity, crystalline orientation and grain distribution are cardinal factors in determining the physical properties of the material. The grain distribution can be measured using a…
View article: Simple method of measuring thicknesses of surface-hardened layers by laser ultrasonic technique
Simple method of measuring thicknesses of surface-hardened layers by laser ultrasonic technique Open
We proposed a simple non-contact inspection method using a laser ultrasonic technique to measure the thickness of a surface-hardened layer. This measurement is based on the dependence of a surface-wave velocity on the thickness of the hard…
View article: Single pixel camera methodologies for spatially resolved acoustic spectroscopy
Single pixel camera methodologies for spatially resolved acoustic spectroscopy Open
Spatially resolved acoustic spectroscopy (SRAS) is a laser ultrasound technique used to determine the crystallographic orientation (i.e., microstructure) of materials through the generation and measurement of surface acoustic wave velocity…
View article: Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing
Spatially Resolved Acoustic Spectroscopy Towards Online Inspection of Additive Manufacturing Open
High-integrity engineering applications such as aerospace will not permit the incorporation of components containingany structural defects. The current generation of additive manufacturing (AM) platforms yield components with relativelyhig…
View article: Spatially resolved acoustic spectroscopy (SRAS) microstructural imaging
Spatially resolved acoustic spectroscopy (SRAS) microstructural imaging Open
© 2019 Author(s). Spatially resolved acoustic spectroscopy (SRAS) is an acoustic microscopy technique that can image the microstructure and measure the crystallographic orientation of grains or crystals in the material. It works by measuri…
View article: Spatially resolved acoustic spectroscopy for texture imaging in powder bed fusion nickel superalloys
Spatially resolved acoustic spectroscopy for texture imaging in powder bed fusion nickel superalloys Open
© 2019 Author(s). There is a clear industrial pull to fabricate high value components using premium high temperature aerospace materials by additive manufacturing. Inconveniently, the same material properties which allow them to perform we…
View article: Imaging Material Texture of As-Deposited Selective Laser Melted Parts Using Spatially Resolved Acoustic Spectroscopy
Imaging Material Texture of As-Deposited Selective Laser Melted Parts Using Spatially Resolved Acoustic Spectroscopy Open
Additive manufacturing (AM) is a production technology where material is accumulated to create a structure, often through added shaped layers. The major advantage of additive manufacturing is in creating unique and complex parts for use in…
View article: Crystallographic texture can be rapidly determined by electrochemical surface analytics
Crystallographic texture can be rapidly determined by electrochemical surface analytics Open
Orientation affects application-defining properties of crystalline materials. Hence, information in this regard is highly-prized. We show that electrochemical jet processing (EJP), when coupled with accurate metrological appraisal, can cha…
View article: Targeted rework of powder bed fusion additive manufacturing
Targeted rework of powder bed fusion additive manufacturing Open
There is a clear industrial pull to fabricate high value components using premium high temperature aerospace materials by additive manufacturing. Inconveniently, the same materials’ properties which allow them to perform well in service re…
View article: Meso-scale defect evaluation of selective laser melting using spatially resolved acoustic spectroscopy
Meso-scale defect evaluation of selective laser melting using spatially resolved acoustic spectroscopy Open
Developments in additive manufacturing technology are serving to expand the potential applications. Critical developments are required in the supporting areas of measurement and in process inspection to achieve this. CM247LC is a nickel su…
View article: Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces
Enhanced sensing and conversion of ultrasonic Rayleigh waves by elastic metasurfaces Open
Recent years have heralded the introduction of metasurfaces that advantageously combine the vision of sub- wavelength wave manipulation, with the design, fabrication and size advantages associated with surface excitation. An important topi…