Agustiyanto, Frans Rizal (2025) Pengembangan Sensor Mekanik Jantung Menggunakan Serat Optik Berstruktur Singemode-Multimode-Singlemode. Doctoral thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
The limitations of electrocardiography (ECG) in providing mechanical information and its susceptibility to electromagnetic interference necessitate alternative monitoring technologies. This research comprehensively develops and validates a non-invasive platform based on a Singlemode-Multimode-Singlemode (SMS) structure fiber optic sensor to detect three key mechanical heart signals: Apexcardiography (ACG), Seismocardiography (SKG), and Phonocardiography (PCG). The methodology involved sensor fabrication, the application of digital signal processing techniques such as Butterworth and bandpass filters for feature extraction, and quantitative validation against an ECG as the gold standard.
The results demonstrate that the SMS platform successfully detected all three signals. For the ACG application, an innovative two-stage filtering process enabled accurate signal extraction. For the PCG application, the sensor identified S1 and S2 heart sounds with 93.26% accuracy, yielding heart rate measurements with high fidelity to the ECG. The most significant and fundamental finding was in the SKG application. Encapsulating the sensor with Polydimethylsiloxane (PDMS) was proven to critically enhance measurement accuracy to 97.71%. Bland-Altman analysis confirmed that the PDMS-encapsulated SKG sensor has high agreement and is interchangeable with the ECG, whereas the unencapsulated sensor proved unreliable for quantitative measurements. Overall, this research successfully demonstrates that the SMS fiber optic sensor platform is a versatile, accurate, and low-cost solution for multimodal cardiac mechanical monitoring. The primary contribution of this work is the first quantitative proof that PDMS encapsulation is not merely protective but is an essential functional element, acting as a mechanical impedance matching layer to achieve clinical-grade reliability in SKG sensors. This finding opens avenues for the development of dependable and safe non-invasive diagnostic tools.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Uncontrolled Keywords: | Sensor Serat Optik SMS, Sinyal Mekanik Jantung, Apekskardiografi, Seismokardiografi, Fonokardiografi, Sistem Pemantauan Jantung, PDMS |
| Subjects: | R Medicine > R Medicine (General) > R856.2 Medical instruments and apparatus. T Technology > T Technology (General) > T57.5 Data Processing |
| Divisions: | Faculty of Industrial Technology > Physics Engineering > 30001-(S3) PhD Thesis |
| Depositing User: | Frans Rizal Agustiyanto |
| Date Deposited: | 11 Aug 2025 04:10 |
| Last Modified: | 11 Aug 2025 04:10 |
| URI: | http://repository.its.ac.id/id/eprint/128037 |
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