EMR Detection and Mitigation on the LSV2

Our goal is to investigate, develop, and improve EMR detection and mitigation techniques in order to assist the advancement of US Navy stealth technology.

Problem Statement
The US Navy Acoustic Research Detachment in Bayview, ID on the southern shores of Lake Pend Oreille, is experiencing electromagnetic interference(EMI) issues with their acoustic data collection. They have asked us to locate the sources of electromagnetic radiation(EMR) and to figure out how to mitigate these sources to reduce interference.

Design Goals and Deliverables
 Establish primary sources of EMI Measure radiation and plot electromagnetic spectrum Analyze and determine best mitigation techniques Create and test mitigation scheme in lab 

Specifications
Specifications will be similar to the military standards listed here.

Summary
We are learning about electromagnetic waves interactions with materials, use of spectrum analyzer and antennas (loop and stub) to measure emissions, and industry and military standards for electromagnetic compatibility in order to provide the Navy ARD with a successful EMI mitigation solution. Details of our research include learning about various techniques for mitigation of both radiated and conducted emissions and the complexities of these solutions.

Equipment
The US Navy ARD has provided us with the equipment that they have been using so that we could try and recreate their results.

Test Setup
To test the setup and verify that the inverter is a primary source of EMI, we need to energize it and use the spectrum analyzer to observe the EMR it is emitting.

The operating voltage range of the inverter is 320-440VDC. To reach that range, we have been working in the power lab, connecting the 120V and the 240V generators in series and then feeding the resulting voltage into the inverter. To dissipate the power being generated and allow the inverter to actually draw the power, we are connecting the output of the inverter to 6 resistor banks in parallel, to reach a max load of around 7 ohms(?).

Minutes