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- 저자 : 이동녁(Dongnyuk Lee) (검색결과 1 건)
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황수하(Suha Hwang),박범식(Beomsik Park),전수홍(Soohong Jeon),이동녁(Dongnyuk Lee) 한국소음진동공학회 2023 한국소음진동공학회 논문집 Vol.33 No.4
In this study, the sound pressure levels of night vision goggles and image intensifier tube were measured, and the results were used to consider their characteristics. First, literature and previous studies were investigated to identify the cause of noise in night vision goggles, and it was determined that it was caused by the auto-gating function of the image intensifier tube. The noise measurement confirmed that the noise of the image intensifier tube was not a complex tone type noise, but a tonal noise limited to 3.15 kHz. Next, the noise was subjected to a human evaluation. Consequently, 3.15 kHz tonal noise was found to be perceivable by human ears from approximately 8 dB, and because this noise occurs in the high frequency region, it is thought that there could have been complaints from soldiers. Subsequently, as a result of checking the response characteristics of the night vision goggles through the impact hammer, the natural frequency of the night vision goggles housing was approximately 1.8 kHz, which was different from the noise of the image intensifier tube. In addition, it was confirmed that there was a sound insulation effect at 3.15 kHz due to the housing of the night vision goggles; the results of this study are expected to contribute to the noise evaluation of night vision goggles in the future.
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