- Reconstruction codes for 2D tomography, specifically the C++ codes for solver are being worked upon. Got some good initial inputs from Kavitha (Dr. Kavitha Arunachalam, Asst. Professor, IIT-M)
- Setting up 2D scanning system for free space measurements for property measurements of dielectric and other materials.
- Running some patch antenna simulations for antenna array for the microwave tomography project.
- Looking for ways to create solid tissue phantoms for experiments on the Brain project
Cori's research involves air-coupled ultrasonic testing. After spending much of last week reading up on the subject, she has started testing samples and has been given case studies to complete. Currently, she, Jack, and a few of the Indian interns are researching the effects of angle and distance between the probes on the clarity of the c-scan image of a laminate sample. She is enjoying her time here in India, inside the lab and out, and is thrilled with the opportunity.
The type of NDE equipment that I have been using is called ground penetrating radar (GPR). What the GPR does is transmit a set of high frequency microwaves through a surface material and receive the reflections as they bounce back off of different dielectric materials. In the early stages of the project, I have been familiarizing myself with both the 2.6 GHz as well as the 900MHz systems in order to find a comfort level with these apparatuses. The system that I will be using for the project is the 2.6GHz GPR which is the highest possible frequency available today. I have taken some experimental data samples and compared them using the software called RADAN from GSSI so that I can understand the GPR and the software better. The overall goal of my project will be to determine the location, depth, and most importantly the diameter of reinforcing steel bar in concrete. The diameter is the most difficult thing to determine because the radar doesn?t produce adequate data for determining this measurement like it does for the location and depth. A set of algorithms as well as some advanced post processing of the data will be necessary in order to determine these diameters. The GPR itself can be used in a very wide span of applications in different civil engineering fields from finding air voids or rebar in concrete, to determining the precise location of underground piping systems.
I have been working with phased array ultrasonics as well as infrared thermal imaging cameras. So far my team and I have used phased array ultrasonics to test for welding defects in aluminum components, and we have also tested for defects in carbon composites typically used in aircraft. Recently, a new project opportunity has opened up to investigate welding discontinuities in the welding department using thermal imaging cameras. We have begun learning the instrumentation and the vital processes involved in thermography, including testing an aluminum-honeycomb sample with known defects to further understanding.
It has been great adventuring through the city and making new friends in Chennai. One of the most enjoyable things so far has been playing basketball with other students here at IIT. It has also been enjoyable spending time with other interns outside of work.
Samer is working on the Ground-Penetrating Radar (GPR) project. It uses EM waves that penetrate into concrete slabs, pavements, and even soils to analyze the subsurface layers. Experiments have been run using this method to determine the orientation, the horizontal and vertical location of steel rebars in concrete structures, along with the diameter of those rebars. Continued work on these objectives will continue into the beginning of next week and will then switch more towards the implementation of post-processing methods on the raw data obtained from samples.
I am having a great time here in India so far. Exploring the Chennai city area and traveling to Pondicherry has been exciting. The food is good, the people are friendly and helpful when trying to find places, and the weather is much easier to get used to than expected. I am excited to see more, different parts of India as well, including Bangalore, New Delhi, the Taj Mahal, and the Himalayas.
More to come soon!