US 12,372,616 B1
Near-IR emulator for complex electromagnetic structures
Tariq Manzur, Lincoln, RI (US); and Yifei Li, East Walpole, MA (US)
Assigned to The United States of America as represented by the Secretary of the Navy
Filed by The United States of America as represented by the Secretary of the Navy, Newport, RI (US)
Filed on Jul. 22, 2022, as Appl. No. 17/870,903.
Int. Cl. G01S 7/41 (2006.01); G01S 7/282 (2006.01); G01S 13/524 (2006.01); G01S 13/90 (2006.01)
CPC G01S 7/415 (2013.01) [G01S 7/282 (2013.01); G01S 13/524 (2013.01); G01S 13/9021 (2019.05); G01S 13/9064 (2019.05)] 19 Claims
OG exemplary drawing
 
1. A device for measuring electromagnetic properties of a target comprising:
a stage capable of holding, rotating, and translating the target;
a mirror that is capable of being laterally translated;
a light source capable of providing a light signal wherein said light signal is white noise light in the near-IR frequency range;
a splitter connected to said light source and having outputs capable of dividing the light signal into a target light path and a reference light path;
a first collimator lens positioned to receive light from said splitter in the target light path, and further positioned to focus light from the target light path on said stage wherein reflected light is returned to said first collimator lens as a target reflected signal;
a second collimator lens positioned to receive light from said splitter in the reference light path, and further positioned to focus light from the reference light path on said mirror wherein reflected light is returned to said second collimator lens as a reference reflected signal;
an optical coupler having a target input positioned to receive the target reflected signal from said first collimator lens and a reference input positioned to receive the reference reflected signal from said second collimator lens, said optical coupler having a combined optical output providing a combined optical signal from the target input and the reference input; and
a signal processor connected to said optical coupler and capable of determining electromagnetic properties of the target from the combined optical signal.