Casmika Saputra

Telkom University · Department of Engineering Physics

Using an aerosol charger based on a radioactive source remains a priority due to the stability and balance of the ions they produce. Furthermore, the utilization of radioactive sources requires intense caution. Subsequently, special treatment is needed in handling radioactive waste after the charger is no longer in use. Therefore, the lifespan of t...

A pulse height analyzer (PHA) is used to measure the frequency distribution of the signal output height of an event detector. However, the typical PHA algorithm has limitations in measurement; it cannot distinguish multiplet due to coincidence and singlet pulse. Coincidences will pile up the signals that make the pulse height value higher than it s...

The performance of a needle tungsten corona-discharge charger (NTCC) as a neutralizer in an electrospray aerosol generator (EAG) is compared to that of a surface-discharge micro-plasma aerosol charger (SMAC). We demonstrate the performance of an EAG with a reduction chamber that consists of a neutralizer. The ion produced by the neutralizer is char...

We developed an aerosol charger that incorporated commercial ionizers to make the setup simple and easily replicated. The built-in high-voltage source for inducing corona discharge embedded in the developed charger (MHM charger) was modulated with pulses so the production of positive and negative ions could be independently regulated. We have studi...

The performances of dual needle corona discharge (NCD) as bipolar ion source to neutralize the electrospray (ES) particles were characterized and optimized. The NCD was constructed from a tungsten needle and grounded mesh electrode in the needle-to-plane configuration. The dual NCD created a bipolar ion environment by mixing the balanced concentrat...

This study examined the development of a digital pulse analyzer (DPA) used for obtaining the pulse height distribution (PHD), pulse width distribution (PWD), and interval time distribution (ITD) simultaneously by processing output signals from an optical particle counter (OPC). The characterization was performed by testing the response of the DPA a...

A solar simulator suitable for universities’ lab was designed and developed using a quartz tungsten halogen lamp as its light source, an alternating current phase-cut dimmer, a light intensity meter, and an ATMega328p microcontroller with a computer and a liquid crystal display. Noting that the quartz tungsten halogen lamp suffers bulb overheating...

The production and characterization of air filter membranes from HIPS waste are presented. The HIPS membranes were synthesized using needleless electrospinning. The HIPS precursor solutions were made by dissolving the HIPS waste in the d-limonene:DMF solvent mixing ratio of 3:1, 1:1, and 1:3. The different mixing ratio led to different viscosity, s...

Pulse height analysis (PHA) has been designed and evaluated, which was applied to an optical particle counter (OPC, Rion KC-03), for measuring the particle size distribution. A commercial ADC module (Contec, AIO-160802AY) was employed to convert, record, and process the OPC output signal. A self-designed application processed the ADC data into dist...

The negative impact of PM 2.5 exposure has encouraged the development of scattering-based PM sensors for monitoring the PM level spatially and temporally. These PM sensors excel in terms of cost, operating power, and compactness, but the performance of each model needs to be evaluated individually. The evaluation of a PM sensor can be conducted ins...

Venturimeter is an apparatus that can be used to measure the air flow rate. In this experiment we designed a venturimeter which equipped with a valve that is used to control the air flow rate. The difference of pressure between the cross sections was measured with the differential pressure sensor GA 100-015WD which can calculate the difference of p...

Tada-san dalam dorama berjudul Proposal Daisakusen berpendapat bahwa kurva y 1 =e x dan y 2 =ln(x) tidak akan pernah berpotongan. Dengan cara pandang yang lain, suatu bentuk transformasi pernyataan Tada-san adalah salah. Kedua kurva tersebut berhimpit dalam koordinat (u,v) yang merupakan transformasi diferensial dari koordinat (x,y). Transformasi k...

Telah dibuat Clapper Switch menggunakan sensor Electret CondenserMicrophone dengan memanfaatkan sinyal audio sebagai pemicu multivibrator monostabil. Kemudian monostabil dijadikan sebagai clock dari JK flip-flop. Pembuatan Clapper Switch bertujuan untuk membuat saklar yang dapat di On/Off kan melalui tepukan tangan, Hasilnya sangat baik. Rangkaian...

Tubuh manusia memiliki sistem buffer temperatur, yaitu dapat menjaga temperatur tubuh tetap dalam keadaan thermonetral (36,5 o C - 37,5 o C). Suatu kondisi temperatur tubuh turun dibawah 35 o C disebut Hipotermia, disebabkan oleh banyak hal salah satunya lingkungan ekstrem dingin. Belum ada alat bantu peringatan dini potensi hipotermia akibat lingk...

Telah dibuat SpiroComp, yaitu spirometer yang memanfaatkan microphone laptop sebagai sensor ekspirasi. Dilakukan signal processing dengan cara pendeteksian Hilbert Envelope hingga konversi menjadi parameter fungsi paru. Parameter tersebut adalah FVC, FEV1, Rasio FEV1/FVC, dan PEF. Kemudian ditampilkan dalam bentuk grafik Volume-Flow dan Volume-Wakt...

Dirancang dan dibuat sebuah instrumen akuisisi data kadar air dalam tanah dengan display hasil pengukuran menggunakan komputer. Sistem instrumen ini terdiri dari perangkat keras dan perangkat lunak. Sistem perangkat keras yang dimaksud adalah sensor kadar air, mikrokontroler Arduino Uno, dan sebuah komputer. Sensor kadar air dibuat menggunakan Prob...