The most up-to-date information regarding Gerry's published research can be found on his

Google Scholar, ResearchGate, ORCID, and Linkedin profiles.


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Next Generation Sensing Technology Laboratory

Beginning in July 2013 and continuing to the present, Gerry has worked as a research engineer at the Next Generation Sensing Technology Laboratory at the University of Rhode Island. Next Lab's goal is to use elements of both wave optics and microwave photonics to design and test novel sensing strategies and devices. The lab's current work includes chemical sensors in partnership with the URI Department of Chemical Engineering, explosive characterization in partnership with the Department of Chemistry, an integrated optical sensing and computer architecture designed to actively monitor critical infrastructure in partnership with two Computer Engineering professors, and the creation of novel swept frequency laser technologies.

Patents

• T Wei, Z Chen, G Hefferman. US10224694B2: Method and apparatus for coherence enhancement of sweep velocity locked lasers via all-electronic upconversion. Priority Date 7/21/2017, Granted 3/5/2019

• T Wei, Z Chen, G Hefferman. US9958605B2: Weak reflection terahertz fiber optic devices for distributed sensing applications. Priority Date 12/1/2015, Granted 5/1/2018

• T Wei, Z Chen, G Hefferman. US9841301B2: Digitally controlled chirped pulse laser for sub-terahertz range fiber structure interrogation. Priority Date 12/1/2015, Granted 12/12/2017

• Several other patents pending

Publications

2019

• Z Yao, T Mauldin, G Hefferman, T Wei. Digitally integrated self-trained pre-distortion curve finder for passive sweep linearization of semiconductor lasers (Accepted, In Press). IEEE Journal of Selected Topics in Quantum Electronics. 2019

• Z Yao, G Hefferman, K Ren, T Wei. Self-adaptive method of performance enhancement of sweep-velocity-locked lasers. Optical Engineering. 2019

2018

• Z Yao, T Wei, G Hefferman, K Ren. Real-time signal processing for sub-THz range grating-based distributed fiber sensing. Review of Scientific Instruments. 2018

• Z Yao, Z Chen, G Hefferman, T Wei. Real-time in-chip phase noise characterization of digitally controlled swept laser source. SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring; Denver, Colorado; March 5-8, 2018

• Z Yao, G Hefferman, R Kan, T Wei. Real-time signal processing for sub-THz range grating-based distributed fiber sensing. SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring; Denver, Colorado; March 5-8, 2018

• Z Chen, G Hefferman, Z Yao, T Wei. A high-linear sweep laser source to interrogate sub-terahertz range fiber sensors for dynamic strain sensing applications. SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring; Denver, Colorado; March 5-8, 2018

• Z Chen, S Pei, B Tang, G Hefferman, H He, Q Yang, T Wei. A distributed optical fiber sensing system for data center thermal monitoring. SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring; Denver, Colorado; March 5-8, 2018

2017

• Z Chen, G Hefferman, T Wei. A sweep velocity-controlled VCSEL pulse laser to interrogate sub-THz-range fiber sensors. IEEE Photonics Technology Letters. 2017

G Hefferman, Z Chen, T Wei. Extended-bandwidth frequency sweeps of a distributed feedback laser using combined injection current and temperature modulation. Review of Scientific Instruments. 2017

• Z Chen, G Hefferman, T Wei. Field-programmable gate array-controlled sweep velocity-locked laser pulse generator. Optical Engineering. 2017

• B Tang, Z Chen, G Hefferman, S Pei, T Wei, H He, Q Yang. Incorporating Intelligence in Fog Computing for Big Data Analysis in Smart Cities. IEEE Transactions on Industrial Informatics. 2017

• Z Chen, G Hefferman, T Wei. Digitally controlled chirped pulse laser for sub-terahertz-range fiber structure interrogation. Optics Letters. 2017

• Z Chen, G Hefferman, T Wei. Terahertz-range weak reflection fiber optic structures for sensing applications. IEEE Journal of Selected Topics in Quantum Electronics. 2017

• Z Chen, G Hefferman, T Wei. A low bandwidth DFB laser-based interrogator for terahertz-range fiber Bragg grating sensors. IEEE Photonics Technology Letters. 2017

2016

• Z Chen, G Hefferman, T Wei. A rapid demodulation method for optical carrier based microwave interferometer. SPIE Commercial + Scientific Sensing and Imaging Conference; Baltimore, Maryland, USA; 17-21 April, 2016

• Z Chen, G Hefferman, L Yuan, Y Song, T Wei. Terahertz-range interrogated grating-based two-axis optical fiber inclinometer. Optical Engineering. 2016

• Z Chen, R Rettinger, G Hefferman, J Smith, J Oxley, T Wei. Microwave modulated photon Doppler velocimetry. IEEE Photonics Technology Letters. 2016

2015

• B Tang, Z Chen, G Hefferman, T Wei, H He, Q Yang. A hierarchical distributed fog computing architecture for big data analysis in smart citiesASE International Conference on Big Data; Kaohsiung, Taiwan; October 7-9, 2015

• Z Chen, G Hefferman, T Wei. Multiplexed oil level meter using a thin core fiber cladding mode exciter. IEEE Photonics Technology Letters. 2015

• Z Chen, G Hefferman, L Yuan, Y Song, T Wei. Ultra-weak waveguide modification with intact buffer coating using femtosecond laser pulses. IEEE Photonics Technology Letters. 2015

• Z Chen, G Hefferman, T Wei. Multiplexed displacement fiber sensor using thin core fiber exciter. Review of Scientific Instruments. 2015

G Hefferman, Z Chen, L Yuan, T Wei. Phase-shifted terahertz fiber Bragg grating for strain sensing with large dynamic range. IEEE Photonics Technology Letters. 2015

• Z Chen, L Yuan, G Hefferman, T Wei. Terahertz Fiber Bragg Grating for Distributed Sensing. IEEE Photonics Technology Letters. 2015

• Z Chen, L Yuan, G Hefferman, T Wei. Ultraweak intrinsic Fabry–Perot cavity array for distributed sensing. Optics Letters. 2015

2014

G Hefferman, Z Chen, T Wei. Two-slot coiled coaxial cable resonator: reaching critical coupling at a reduced number of coils. Review of Scientific Instruments. 2014

• Z Chen, Y Zeng, G Hefferman, Y Sun, T Wei. FiberID: molecular-level secret for identification of things. IEEE International Workshop on Information Forensics and Security, Atlanta, Georgia, USA. Dec. 3-5, 2014


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Warren Alpert Medical School of Brown University and Rhode Island Hospital: Departments of Diagnostic Imaging and Internal Medicine

During his time as a medical student at the Warren Alpert Medical School of Brown University, Gerry has worked with a number of clinician scientists conducting medical research. Selected publications are included below.

Publications

G Hefferman, D Swenson, R Ayyala, B Murphy, M Johnson, G Jindal. Information availability on emergency radiology fellowship websites: current state and paths to improvement. Emergency Radiology. 2019

• V R Konjeti, G Hefferman, S Paluri, P Ganjoo. Primary Pancreatic Burkitt’s Lymphoma: A case report and review of literature. Case Reports in Gastrointestinal Medicine. 2018


Neuromuscular Rehabilitation Engineering Laboratory

Over the summer of 2011 and from May 2012 to July 2013, Gerry worked as a biomedical engineering research assistant at the Neuromuscular Rehabilitation Engineering Laboratory at the University of Rhode Island. The lab's work centered on the design and testing of neutrally-controlled, powered lower-limb prostheses. Gerry's research focus was the successful integration of surface electromyographic sensors into the sockets of amputee subjects in a way that both maximized patient comfort and signal fidelity, with the ultimate aim of using neuromuscular data as a means of intuitive, reliable prosthesis control. This line of research culminated in a manuscript published in Prosthetics and Orthotics International.

Publications

G Hefferman, F Zhang, M Nunnery, H Huang. Integration of surface EMG sensors with the transfemoral amputee socket: a comparison of four differing configurations. Prosthetics and Orthotics International. 2014