Nachappa “Sami” Gopalsami conducts research on the development of fieldable electromagnetic sensors for detection of chemical, biological, radiological, nuclear and explosive materials.
Gopalsami has developed and field-tested active and passive millimeter-wave systems for remote chemical detection at the Department of Energy’s Nevada test site. He developed and applied a compressive sensing technique to passive millimeter-wave imaging that showed a tenfold increase in imaging speed.
With a heat cell spectrometer built at Argonne, he has measured and catalogued terahertz spectral signatures of high explosive molecules for the first time. He is currently investigating remote detection of radioactive plumes and special nuclear materials using radar reflective ionized air targets and is developing a method of biomarker standoff detection for determining personal intent.