Acoustic Measurement and Model Predictions for the Aural Nondetectability of Two Night-Vision Goggles

Report No. ARL-TR-6738
Authors: Jeremy Gaston; Tim Mermagen; Kelly Dickerson
Date/Pages: November 2013; 32 pages
Abstract: This study evaluates two different night-vision goggles (NVGs) to determine if the devices meet level II aural nondetectability standards of MIL-STD-1474D for a detection distance of 10 m. These systems (PVS-14 and PVS-7D) were tested while mounted on an Advanced Combat Helmet placed on the Knowles Electronic Manikin for Acoustic Research Auditory Test Fixture in the Environment for Auditory Research's Dome Room, a semi-anechoic research space. All tests were conducted in both the linear and automatic gain control (AGC) modes of operation for each system, and measurements were made at eight locations around the devices. The results of the testing revealed that in the linear mode, both devices emitted a faint tone centered at 2 kHz, but in no case did the NVGs fail the nondetectability criteria of 10 m. In AGC mode, both systems emitted a tone but the PVS-14 did not fail the nondetectability criteria. However, the PVS-7D failed the 10-m detection criteria at several of the measurement positions.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2013