Rancang Bangun Alat Pemilah Bawang Merah Berdasarkan Ukuran Diameter

Telah dilakukan perancangan dan pembuatan alat pemilah bawang merah berdasarkan ukuran diameternya. Alat ini memanfaatkan  pengolahan citra digital dalam memproses data yang diambil. Data yang diambil dalam penelitian ini berupa data citra berformat bitmap yang diambil menggunakan webcam. Data citra yang diperoleh kemudian diolah dengan menggunakan software yang dibuat di Microsoft Visual Studio 2010. Dari hasil pengolahan citra data yang diperoleh maka akan diperoleh nilai ukuran bawang merah yang kemudian akan dikelompokkan kualitasnya berdasarkan ukuran hasil pengolahan data dari alat. Pengujian alat dilakukan terhadap 51 siung bawang merah dengan kualitas yang berbeda-beda. Dari penelitian ini dapat disimpulkan bahwa telah berhasil difabrikasi sebuah alat  untuk memilah bawang merah berdasarkan ukurannya dengan kecepatan 6 siung per menit. Sistem yang dibuat memiliki kemampuan untuk mengenali tiga perbedaan ukuran. Alat yang telah dibuat dalam Tugas Akhir ini telah berhasil memilah 52 bawang merah dalam tiga kategori ukuran yaitu kelas I (20 siung) dengan error 1.14%, kelas II (11 siung) dengan kesalahan 3.06% dan kelas III (20 siung) dengan kesalahan 3.04%. Perbandingan antara hasil pengukuran alat dengan ukuran sebenarnya adalah sebanding dengan persamaan y = 0,9977x + 4,2791

Wire-Mesh 16 × 16 Capacitance Sensor for Analysis of Capacitance Distribution on Cylindrical Pipe

The wire-mesh sensor is an intrusive sensor device that uses for generating 2-dimensional (2D) images of fluid flow. Sensors made of 2 layers copper wires, transmitter, and receiver, that perpendicular each other. The wire-mesh sensor will directly to measure the value of inductance or capacitance at the crossing wire. There are 208 data measurements in 16 × 16 cylindrical wire-mesh sensors. All data measurement then processed by Python software to obtain a 2D image of the capacitance distribution. Experiment results show the inhomogeneous distribution of capacitance that occurs in the wire-mesh sensor. Three types of liquids, distilled water, tap water and salt solution, showed circular pattern of capacitance distribution, with the highest capacitance value being in the central area of the image, while at edge area has a lower capacitance value than the central are

BAND-PASS FILTER CIRCUIT DESIGN FOR MULTI-FREQUENCY ELECTRICAL IMPEDANCE TOMOGRAPHY SYSTEM

BAND-PASS FILTER CIRCUIT DESIGN FOR MULTI-FREQUENCY ELECTRICAL IMPEDACE TOMOGRAPHY SYSTEM. Electrical Impedance Tomography (EIT) is one of the emerging imaging technologies recently. The principle of EIT system is inject electric current into impedance object and measure the voltage based on the electrodes array. The current source that precise, stable, and wide-bandwidth is required to obtain voltage measurements accurately. The current source used for this EIT system is Voltage-Controlled Current Source (VCCS). The VCCS block circuit consists of several circuits, one of them is a filter circuit. The suitable filter for multi-frequency EIT system is band-pass filter. This research has been designed and fabricated a band-pass filter with cut-off frequency 1 and 250 kHz, which is using Butterworth coefficient, unity gain, and Sallen-Key topology

The Influence of Multi-frequency Current Injection in Image Reconstruction for Two-Dimensional High-Speed Electrical Impedance Tomography (EIT)

The image reconstruction for two-dimensional high-speed Electrical Impedance Tomography (EIT) has been successfully studied with multi-frequency current injection. The aim of this study is to get the best image reconstruction under the influence of multi-frequency current injection of this EIT system. In this method, we used current injection at 1 mA with varies of frequency in the range 10 to 50 kHz injected at the practical phantoms with 16 electrodes. Polyvinyl chloride (PVC) cylinder was put in the practical phantom as the anomaly. Then, The boundary voltage of the practical phantom was measured by the voltage measurement circuit. After that, it processed in the computer with Gauss-Newton Algorithm to got image reconstruction. The result showed that the best image reconstruction was achieved at 10 kHz of frequency current injection. The best image reconstruction had more accuracy of shape, position and electrical properties of an anomaly in boundary phantom than another image reconstruction result

Perancangan dan Pembuatan Sensor Level untuk Sistem Kontrol pada Proses Pengendapan CaCO3 dalam Air dengan Metode Medan Magnet

Telah dilakukan pembuatan alat pengukur level air dengan menggunakan sensor Ultrasonic Range Detector PING))). Sistem pengendalian dan monitoring secara otomatis dikerjakan oleh mikrokontroler Atmega16 dan PC. Pada penelitian ini dirancang sebuah mini plant untuk kontrol otomatisasi proses pengendapan air CaCO3 dalam air. Sistem pemantauan dan pengendalian dirancang secara waktu nyata berupa level ketinggian air pada tangki hasil pengolahan. Data level akan diproses oleh mikrokontroler ATMega16 yang selanjutnya dikirim melalui komunikasi serial dengan USB yang disambungkan ke komputer sehingga dapat ditampilkan di layar monitor. Berdasarkan hasil penelitian, sistem ini dapat bekerja dengan baik ketika melakukan monitoring pada level 4080%

Analysis of Feedback Parameter with Vibration Sensor on Signal Self-Mixing Interferometry

In the research aims to analyzed feedback parameter on Self-Mixing Interferometry (SMI) signals. It is because the feedback parameter is one of the determined parameters in SMI vibration sensor research. The experimental apparatus consists of a laser diode as the light source, mirror as a target, collimator as light alignment, and PLX-DAQ as data acquisition executed by Arduino Uno. The principle of data retrieval with the manner of the light source is directed exactly perpendicular to the vibrating target, then reflected and arrested by the detector (photodiode) contained in the laser diode. Light arrested by the photodiode in the form of optical value then automatically converted into voltage value displayed on a personal computer (PC). This feedback on SMI is obtained by variation of the vibration frequency given to a target. The variation of vibration given is 10-100 Hz with 10 Hz increment and each frequency is taken 1000 data. Based on the research that has been done then results obtained at the frequency of 10-30 Hz feedback does not appear because the vibration small so that the vibration sensor is less than optimal. Feedbacks appear at frequencies 40 Hz and 50 Hz but are clearly visible at frequencies 50 Hz. While at 60-80 Hz frequency feedback begins to disappear. The existence of feedback on frequency 50 Hz indicated that vibration sensors on SMI can be applied to industry and medical fiel

Pengaruh Variasi Penempatan Kutub Medan Magnet pada Pengurangan Kadar CaCO3 dalam Air

Telah dilakukan pengurangan kadar CaCO3 dalam air dengan menggunakan variasi kutub medan magnet. Medan magnet berpengaruh langsung terhadap proses pengurangan kadar CaCO3 dalam air. Hasil penelitian menunjukkan bahwa perlakuan kutub medan magnet yang di letakkan secara seri pada larutan sampel dengan konsetrasi CaCO3 dalam air 1040 gr/L menghasilkan prosentase pengurangan maksimum sebesar 30,55% selama 80 menit, sedangkan untuk penempatan kutub magnet paralel menghasilkan pengurangan maksimum sebesar 57,69% selama 120 menit. pH dan konduktivitas larutan air sampel juga di ukur dan didapatkan bahwa terjadi penurunan pH dan konduktivitas setelah air sampel diolah selama 120 menit adalah berturut-turut sebesar 23,43% dan 69,23%