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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Ilmu Fisika
Arimurti, Yesiana
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Astronomy Earth & Planetary Sciences Energy Materials Science & Nanotechnology Physics

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Studi Awal Implementasi Transduser Piezoelektrik sebagai Piranti Pemanen Energi pada Lantai Arimurti, Yesiana; Radiyono, Y; Surantoro, Surantoro
Jurnal Ilmu Fisika Vol 12, No 2 (2020): Published in September 2020
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.12.2.89-97.2020

Abstract

Penelitian ini merupakan studi awal implementasi transduser piezoelektrik pada sebuah piranti pemanen energi berupa lantai piezo. Studi awal yang dilakukan yaitu dengan mengukur tegangan yang dihasilkan dari transduser ketika diterapkan tekanan dengan variasi frekuensi dan material piezoelektrik yang digunakan. Pada penelitian ini, transduser piezoelektrik yang digunakan yaitu elemen piezo dari material keramik polikristal dan piezo vibration sensordari meterial PVDF (polyvinylidenfluoride). Tekanan yang diberikan secara periodik divarisi pada 60 bpm (beat per minute), 80 bpm, 100 bpm, 120 bpm, dan 140 bpm dengan bantuan aplikasi metronome. Tegangan diukur dengan menggunakan multimeter digital. Berdasarkan hasil pengamatan, diperoleh nilai tegangan tertinggi pada frekuensi 60 bpm. Sedangkan untuk perbandingan tegangan yang dihasilkan oleh dua material transduser yang berbeda,bahan keramik polikristalin menghasilkan rerata tegangan yang lebih besar daripada material pvdf.Rerata tegangan yang dihasilkan oleh transduser piezoelektrik keramik sebesar 974,4 mV pada frekuensi 60 bpm dan 707,3 mV pada frekuensi 80 bpm
Portable Electronic Nose for Discrimination of Indonesian Robusta Coffee Aroma with Varied Roasting Temperature Correlated with Gas Chromatography Mass Spectrometry Arimurti, Yesiana; Triyana, Kuwat; Anggrahini, Sri
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (696.94 KB) | DOI: 10.13057/ijap.v9i02.18622

Abstract

The quality of coffee is strongly affected by its aroma, so that instrument for aroma testing is necessary especially for quality control. In this research, coffee aroma was tested using electronic nose and then correlated to gas chromatography-mass spectrometry (GC-MS). The green beans of robusta coffee (coffee canephora var.robusta) originated from Sumatra was used as a testing sample. The roasting temperature was varied to be 180 °C, 195 °C, and 210 °C, while the roasting time was set to be constant at 20 minutes. After the roasting process, the coffee beans were grounded using a coffee grinder. The feature of the response signal for each gas sensors of the electronic nose to ground coffee aroma, was extracted using two methods; i.e. gradient multiplied by signal peak and average value. The principle component analysis (PCA) was applied to discriminate the aroma of ground coffee with varied roasting temperature. The scoreplot of PCA analysis shows a clear discrimination of each coffee aroma, produced by different roasting temperature. From the GCMS analysis, it is clearly confirmed that more aromatic compounds detected when the roasting temperature increase. It is correlated with the discrimination result using electronic nose. The loading plot interpretation provides information that TGS822 and TGS826 are the most affecting sensors for discrimination of coffee aroma with varied roasting temperature. In the future, the electronic nose is potentially applied in coffee industry for quality control during process.
Co-Authors Aminah, Nonoh Siti Aminah Siti Kuwat Triyana Sri Anggrahini Sri Budiawanti Surantoro Surantoro Y Radiyono, Y