Diyanah, Nikmah Ghaly (2025) Penggunaan Sensor Serat Optik Singlemode-Multimode-Singlemode dengan Lapisan Polydimethylsiloxane (PDMS) untuk Validasi Detak Jantung Janin (fHR) pada Sinyal Audio Phonocardiograph (PCG). Other thesis, Institut Teknologi Sepuluh Nopember.
![[thumbnail of 5009211117-Undergraduate_Thesis.pdf]](http://repository.its.ac.id/style/images/fileicons/text.png) |
Text
5009211117-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (8MB) | Request a copy |
Abstract
Pemantauan detak jantung janin (fetal heart rate/fHR) secara non-invasif merupakan elemen penting dalam deteksi dini gangguan kehamilan dan pemeliharaan kesehatan janin. Penelitian ini mengembangkan sistem validasi fHR berbasis audio phonocardiograph (PCG) menggunakan sensor serat optik berstruktur singlemode–multimode–singlemode (SMS) yang dilapisi lapisan polydimethylsiloxane (PDMS). Sinyal fPCG diperoleh dari database terbuka dan disimulasikan melalui speaker subwoofer, yang kemudian dideteksi oleh sensor serat optik. Proses pengolahan sinyal melibatkan pemfilteran frekuensi Butterworth bandpass filter (30–70 Hz), Discrete wavelet transform (DWT), Hilbert transform, serta deteksi puncak untuk estimasi siklus jantung dan penghitungan denyut per menit (BPM). Hasil menunjukkan bahwa sensor dengan panjang multimode 4,5 cm (step index) memiliki performa paling stabil dan akurat, dengan error pengukuran rata-rata ≤5% dan akurasi mencapai 96,35% terhadap nilai BPM referensi dari cardiotocography (CTG). Sensor mampu mendeteksi puncak S1 dan S2 secara konsisten dalam sinyal, termasuk pada variasi usia kandungan (minggu) dan kondisi klinis ibu yang berbeda. Penggunaan PDMS sebagai lapisan pendukung terbukti meningkatkan sensitivitas sensor terhadap getaran akustik. Dengan desain yang ringkas, murah, serta bebas pengaruh medan elektromagnetik, sistem ini layak dipertimbangkan sebagai solusi portabel untuk pemantauan detak jantung janin di luar lingkungan rumah sakit, khususnya di wilayah dengan keterbatasan fasilitas kesehatan di masa mendatang. Penelitian ini membuka peluang pengembangan lebih lanjut dalam integrasi teknologi fotonik dan akustik untuk aplikasi kesehatan janin (fetal) dan ibu hamil (maternal).
=====================================================================================================================================
Non-invasive monitoring of fetal heart rate (fHR) is a vital element in the early detection of pregnancy complications and the maintenance of fetal health. This study developed an fHR validation system based on audio phonocardiograph (PCG) signals using a singlemode–multimode–singlemode (SMS) optical fiber sensor with a layer of polydimethylsiloxane (PDMS) as enclosure. The fPCG signals were obtained from an open-access database and simulated using a subwoofer speaker, then detected by the optical fiber sensor. Signal processing involved Butterworth bandpass filter (30–70 Hz), Discrete wavelet transform (DWT), Hilbert transform, and peak detection to estimate cardiac cycles and calculate beats per minute (BPM). The results showed that the sensor with a 4,5 cm multimode (step-index) fiber exhibited the most stable and accurate performance, with an average measurement error of ≤5% and an accuracy of 96,35% compared to reference BPM values from cardiotocography (CTG). The sensor was able to consistently detect S1 and S2 heart sound peaks within the signal, including under varying pregnancy terms (weeks) and different maternal clinical conditions. The application of PDMS as a supporting layer significantly enhanced the sensor’s sensitivity to acoustic vibrations. With its compact design, low cost, and not affected by electromagnetic interference, the system is considered a promising portable solution for fetal heart rate monitoring outside hospitals, particularly in areas with limited healthcare facilities in the future. This study opens up opportunities for further development in the integration of photonic and acoustic technologies for fetal and maternal health applications.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Detak Jantung Janin, Polydimethylsiloxane, Phonocardiograph, Serat Optik, Fetal Heart Rate, Optical Fiber |
| Subjects: | Q Science > QC Physics > QC100.5 Measuring instruments (General) Q Science > QC Physics > QC221 Acoustics. Sound Q Science > QC Physics > QC448 Fiber optics. R Medicine > R Medicine (General) > R856.2 Medical instruments and apparatus. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis |
| Depositing User: | Nikmah Ghaly Diyanah |
| Date Deposited: | 05 Aug 2025 10:42 |
| Last Modified: | 05 Aug 2025 10:42 |
| URI: | http://repository.its.ac.id/id/eprint/127483 |
Actions (login required)
 |
View Item |