MechE undergraduate student and PIG member Loudon Blake has been making parts for the practice carillion. His work has been part of the EAS141 Machine Shop course. More details on the project can be found here. Nice work Loudon!
Photograph of the new (left) and old (right) hammer head made by Loudon.
[Photo Credits: J. Adam Fenster/University of Rochester]
The Precision Instrumentation Group has recently grown! As of January 2016, Fenghe Zhong and Elizabeth Fox have joined the group.
Fenghe hails from Wuhan, China from Huazhong University of Science & Technology with a background in opto-electronics. He is currently pursuing his MS Thesis research in The Institute of Optics.
Elizabeth is currently a BS student in Mechanical Engineering at the University of Rochester. She is originally from Chapel Hill, NC and is interested in precision engineering and opto-mechanical design.
Jonathan Ellis, along with researchers at the University of South Carolina and the University of North Carolina at Charlotte have recently had a paper accepted in Precision Engineering. The paper entitled, “Application of the continuous wavelet transform in periodic error compensation,” demonstrates a novel algorithm for the compensation of periodic error for both constant and non-constant velocity motion. Congratulations to first author Chao Lu, a MechE PhD student under Prof. Joshua A. Tarbutton at the University of South Carolina, for his first 1st author journal publication!
The prepress of the paper can be accessed here.
Dr. Tieli Zhang‘s stint at the University of Rochester as a Visiting Scientist in the Department of Mechanical Engineering has ended. We wish Dr. Zhang all the best in the future!
Also, we welcome UR MechE Alumnus Tim Lynch into the group as a MS Student working on Freeform Optics Metrology. Welcome, Tim!
Xiangzhi Yu, mechanical engineering PhD student, is defending his PhD Thesis Proposal today, Monday, December 14 at 1 PM. The location for his Proposal Defense is in Hopeman 224.
Precision linear stages provide the basic movement for many nanotechnology systems such as lithography stages, biological scanning systems, and nanofabrication positioning systems. All these systems require precise position sensing for feedback control and extensive calibration procedures to achieve the required accuracy. In this proposal, a compact state-of-the-art multidegree of freedom optical metrology system is presented which will enable fast, accurate calibration and error mapping of multiple axes simultaneously. The working principle for each degree-of-freedom measurement is shown and system-level integration will be investigated to evaluate the overall performance. In addition, the proposed system will significantly mitigate the temporal, dynamic, location and Abbe errors during calibration process. In the end, a refractometer which enables both absolute refractive index of air sensing and tracking based on variable length vacuum cell is presented, which is essential for ultra-precision interferometry measurements under atmospheric conditions.
Steve Gillmer, MechE PhD student, was awarded the 2015 Carl Zeiss Student Scholarship at the recent American Society for Precision Engineering Annual Meeting. This award includes the ASPE Annual Meeting registration fee, four tutorial fees, travel expenses, and lodging to the Annual Meeting. In addition, the scholarship provides for travel and lodging to Maple Grove, Minnesota to visit Carl Zeiss Industrial Metrology. Steve is the third recipient of the Carl Zeiss Student Scholarship awarded through ASPE.
Photo: Steve with Dr. Marcin Bauza of Carl Zeiss IMT and Dr. Byron Knapp of Professional Instruments and ASPE President being awarded the scholarship at the ASPE Annual Meeting in Austin, TX.
Xiangzhi Yu, MechE PhD student, has been part of the winning team at the ASPE Student Competition for the second time. Xiangzhi, along with teammates Andrew Duenner, Ian Ladner, Nilabh Kumar Roy, and Tsung-Fu Yao from the University of Texas at Austin won the ASPE Student Competition at the Annual Meeting of the American Society for Precision Engineering. The students were tasked with building a closed loop controlled X-Y scanning system to image an area the size of a penny using MechBlocks, voice coils, capacitance sensors, and motion controllers in about 9 hours of work. Each winning student was awarded a $1,000 prize and a stainless steel MechBlock kit from MOTUS Mechanical. Congratulations Xiangzhi!
Research by MechE PhD students Xiangzhi Yu and Steven Gillmer has been published by Measurement Science & Technology. Their work, Beam geometry, alignment, and wavefront aberration effects on interferometric differential wavefront sensing, shows how including these effects in DWS can enable calibration level measurements for linear stages. More information on the article can be found here.
Congratulations to Sam Butler and Mike Ricci, MS students in the Department of Mechanical Engineering, for presenting their work at the 2015 SPIE OptiFab conference in Rochester, NY. Their work with co-authors Chen Wang (UR-ECE) and Dr. Qun Wei (CIOMP and UR-Optics) entitled Homodyne displacement measuring interferometer probe for optical coordinate measuring machine with tip and tilt sensitivity was awarded 1st prize in the APOMA Outstanding Student Poster Competition, sponsored by the American Precision Optics Manufacturers Association (APOMA). More information on the award can be found here and their paper can be found here.
Mechanical Engineering PhD students Xiangzhi Yu and Steven Gillmer have just had a paper accepted in Measurement Science & Technology. This paper is Xiangzhi’s first ‘1st author’ paper and is on his work on differential wavefront sensing. More details to follow!