Reverberation time measurements of a neonatal incubator

Puyana‐Romero, Virginia; Núñez-Solano, Daniel; Molina, Ricardo Hernández; Fernández-Zacarías, Francisco; Beira-Jiménez, Juan Luis; Garzón, Christiam; Jara-Muñoz, Edgar

doi:10.1016/j.apacoust.2020.107374

Cited by 8 publications

(7 citation statements)

References 42 publications

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“…Levels were measured twice for each microphone-source combination (i.e., sixteen mic-source measurements). For measurements of the incubator energy distribution, 15 microphone positions were used inside the incubator; this matches the procedure used for small rooms in previous studies conducted by the authors (38,39). A total of 60 noise level measurements were conducted, with four measurements in each of 15 positions.…”

Section: Incubator Acoustic Isolation In Nabs Room (Figure 1b)mentioning

confidence: 99%

Influence of the NICU on the Acoustic Isolation of a Neonatal Incubator

et al. 2020

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The neonatal intensive care unit (NICU) is a very noisy place as compared to the intrauterine environment. To protect the neonate's health, international guidelines suggest avoiding noise levels above 45 dB in NICUs, but this recommendation is not normally met. The incubator acoustic isolation and the acoustic features of the NICU play important roles in determining the noise measured inside the incubator. In this study, the influence of two types of rooms, one with sound-absorbent covering and the other with reverberant surfaces, on the acoustic isolation of a neonatal incubator was evaluated using three acoustic isolation indexes: the level difference, the apparent sound reduction index, and the standardized level difference. Results show that the acoustic isolation of the incubator is very poor, with a level difference below 11 dBA at all frequencies. At 62.5 Hz, the level difference measured in both rooms exhibits a negative value, indicating that the incubator amplifies the noise coming from the NICU. Isolation of the incubator is poor, and the reverberation time (RT) of the containing room influences RT of the incubator, which is consequently higher when the containing room is reverberant; for example, the incubator RT in the reverberant NICU is 0.72 s higher at 500 Hz than that in a room with sound-absorbent covering.

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Section: Incubator Acoustic Isolation In Nabs Room (Figure 1b)mentioning

confidence: 99%

Influence of the NICU on the Acoustic Isolation of a Neonatal Incubator

et al. 2020

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“…Therefore, in this experiment, the influence of the resonant frequencies of the room can be considered negligible. However, the resonant frequencies of rooms with acoustic reflective surfaces -like NICUs- may influence the T of the incubator, especially considering that the acoustic insulation of the incubator is very poor ( 43 , 44 ).…”

Section: Discussionmentioning

confidence: 99%

The Importance of Reverberation for the Design of Neonatal Incubators

et al. 2021

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Low frequency noises are predominant in neonatal intensive care units (NICUs). Some studies affirm that neonates can perceive noises from 113 Hz, and can therefore be affected by sound sources with high spectral content at low frequencies (e.g., incubator engine, air fan). Other studies suggest that reverberation amplifies noise within incubators. In this paper, the reverberation time (T, T30) within an incubator with standard dimensions was measured in one-third octave bands. To get reliable results, the T was measured in 15 positions at the neonate's ear height, in a room with low T values (to reduce the influence of the room in the results), using an impulsive sound method. Results show a heterogeneous T distribution at the neonate's ear height, with maximum average T differences between positions of 1.07 s. The highest average T of all microphone positions is 2.27 s at 125 Hz, an extremely high mean value for such a small space. As the frequency of electrical devices in America is 60 Hz, some harmonics lay within the one-third octave band of 125 Hz, and therefore may create a very reverberant and inappropriate acoustic environment within the audible spectrum of neonates. As the acoustic environment of the incubator and the room are coupled, it is expected that the results are higher in the NICUs than in the room where the measurements were conducted, as NICUs are more reverberant. Therefore, it is recommended that the T will be limited in the international standards, and that incubator designers take it into account.

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“…Inkubator bayi yang baik adalah yang dapat menjaga suhu yang dibutuhkan secara stabil dan merata diseluruh ruang, sehingga inkubator perlu di kalibrasi secara berkala. Ukuran luas inkubator bayi umum sama yaitu panjang ±85cm, lebar ±41 cm, dan tinggi ±40 cm [7] [8]. Pada beberapa kasus ada kemungkinan suhu di dalam inkubator bisa berlebih atau kurang dari normal sehingga pada inkubator bayi umumnya di lengkapi dengan sistem keamanan dan alarm.…”

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Analisis Tingkat Penyebaran Suhu Inkubator Bayi Dengan Sensor DS18B20

Arianto¹,

Siswoyo

2022

JIPA

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Inkubator bayi adalah alat khusus yang digunakan bayi baru lahir yang digunakan untuk menjaga suhu bayi tetap hangat. Suhu di dalam inkubator bayi bisa di atur sesuai dengan kebutuhan bayi. Bayi yang paling banyak membutuhkan inkubator adalah bayi yang lahir prematur dan bayi yang lahir dengan berat rendah. Inkubator bayi yang baik adalah yang dapat menjaga suhu yang dibutuhkan secara stabil dan merata diseluruh ruang. Pada penelitian ini akan fokus pada pengamatan pada penyebaran suhu di dalam inkubator bayi. Pengujian pada penelitian ini akan menggunakan inkubator bayi skala lab. Inkubator bayi akan di setting pada suhu 32℃ kemudian sensor-sensor suhu DS18B20 akan diletakkan di empat sisi di dalam ruang inkubator bayi tersebut. Kemudian akan dilakukan pengukuran selama 30 menit dan diambil data berjangka setiap 2 menit sekali. Prototipe baby incubator temperature analyzer berhasil dibuat dan diuji banding dengan beberapa sensor suhu lain, hasilnya DS18B20 stabil dan memang bisa menjadi pilihan sensor suhu yang baik. Hasil pada pengujian tingkat penyebaran panas pada inkubator bayi, ada ketidak merataan suhu pada tiap titik sensor dengan perbedaan 0,15 ~ 0,29℃. Jika dibandingkan dengan Environment meter Krisbow, hasil pengukuran Environment cenderung lebih rendah. Hasil analisis ini menunjukkan bahwa ada ketidakmerataan tingkat penyebaran suhu panas pada inkubator <0,30℃. Perlu dilakukan analisis lebih detail pada setiap setting suhu inkubator yaitu pada suhu 32~37℃ di penelitian lain.

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Reverberation time measurements of a neonatal incubator

Cited by 8 publications

References 42 publications

Influence of the NICU on the Acoustic Isolation of a Neonatal Incubator

Influence of the NICU on the Acoustic Isolation of a Neonatal Incubator

The Importance of Reverberation for the Design of Neonatal Incubators

Analisis Tingkat Penyebaran Suhu Inkubator Bayi Dengan Sensor DS18B20

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