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!
Congratulations to the PhD students Gustavo Gandara-Montano and Yang Zhao for having their work recently published.
Yang’s work is on using low coherence interferometry to measure the absolute thickness of samples with sub-micrometer accuracy. His work was published in the journal Applied Optics and the link to his article can be found here.
Gustavo, in collaboration with the Knox Lab, had his work on femtosecond micromachining of GRIN microlenses published in the journal Optical Materials Express. The link to his paper can be found here.
We are currently in the process of migrating from our previous website at http://www.me.rochester.edu/projects/jdellis-lab/. Stay tuned!