Articles
130
Documents
Rancang Bangun Sistem Pengaturan Suhu Ruang Inkubator Bayi Berbasis Microcontroller AT89S51

BERKALA FISIKA Vol 12, No 2 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (192.615 KB)

Abstract

A room temperature adjustment system for infant incubator has created using electrical sources phase controlling. This device used  to create environment temperature which is normal and stabile, as in mother’s uterus. The main component of room temperature of infant incubator adjustment which uses electrical sources phase controlling is 100 watt fluorescent hot source, temperature sensor LM 35, ADC 0804, microcontroller AT89S51, DAC 0808, Op-Amp LM 741, Phase detector (IC TCA 785), optical isolator (optocoupler), SCR, Pulse transformator, Coding 74LS47 and seven segment display. The temperature sensor, LM 35, perform data acquisition to room temperature of infant incubator. Furthermore, it strengthened and transformed by ADC 0804 to be digital data and read by microcontroller AT89S51. Reading value compared to accepted value, reading difference use for remove phase activator IC TCA 785 through DAC 0808. IC TCA as phase adjuster through trigger SCR TIC 106, it used to obtain temperature variation in heater lamp. The result is setting poin value with reading value have been as according with extinct indicator of lamp at infant incubator room.   Keywords: infant incubator, temperature, phase control, microcontroller.

Aplikasi Transduser Ultrasonik Jenis Immersion Transducer Untuk Karakteristik Media Cair Dan Pengukuran Tingkat Kekasaran Permukaan Beton

BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (370.202 KB)

Abstract

Research of the application of ultrasonics for liquid medium characteristic and measurement of level of surface roughness of concrete have been done using immersion transducer. This purpose of research is to know characteristic some dilutions based on the atanuasi coefficients and measure surface roughness of concretes based on time of flight. In this research applied by ultrasonic transducer with frequency of 1 MHz.  At attenuation method, awakened ultrasonic signal through pulse generator and connected at transmitter transducer. Ultrasonic wave which transmitted through liquid medium will experience received finite attenuation of receiver. Media liquid which applied is oil and cooking oil. At method time-of-flight, measurement done with object scan which turned around counted 200 rotation apply motor stepper. Object which applied as component of test that is concrete. Reason of selec,choose it this specimen is to minimize attenuation so that will enlarge the bound. Transducer will transmit modulation to object through modulation transmiter and receiver. Result from scanner is presented at CRO ( Cathode Ray Oscilosco). Research result to liquid medium sample showing existence of tendency of increase of attenuation value for ex-oil- and ex-cooking oil if each compared with oil was new and new cooking oil. From measurement of level of surface roughness, obtained by is surface roughness average yield of  concrete A ( Radium of a minimum of 10%, and Ra maximum 16%), and concrete B ( Radium of a minimum of 8%, and Ra maximum 17%). This research result give hope that this method can be developed for inspection innoxious at solid and liquid medium.   keyword : Ultrasonic, attenuation coefficient, level of crudity, Time of Flight

Rancang Bangun Sensor Pergeseran Tanah Digital

BERKALA FISIKA Vol 11, No 4 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (405.554 KB)

Abstract

The Research has been produced digital displacement field sensor system.  This system can be applied on displacement level monitoring of building, bridge, dike  and so forth. This developed system work serial digitally so that It can be connected to computer for many purpose. The field Displacement sensor use sliding potentiometer and  a 10 bit Analog to Digital Converter (ADC) at microcontroller. The value of field displacement is sent digitally as multi byte serial  data through UART serial communication protocol. The acquired data read to computer through COM1 with Borland Delphi 7.0 program. The research A system which can measure field displacement has been  acquired from this research. The system has 1 mm resolution specification with the range of measurement up to 57 meters. From the  sensor’s output  has been acquired the output of the system with has the equation  y = 0,990x + 0,154 with the linear correlation  0,998. Keyword : Displacement, digital, serial

Rancang Bangun Generator Pulsa Gelombang Ultrasonik dan Implementasinya untuk Pengukuran Jarak Antara Dua Obyek

BERKALA FISIKA Vol 11, No 2 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (299.995 KB)

Abstract

An instrument of pulse generator of ultrasonic wave and its implementation for distance measurement between two objects have been created through analysis using oscilloscope. This ultrasonic wave may be used in a distance measurement, material reflection analysis, and product’s depth. An ultrasonic oscillator is made with set of IC 555 as the setter of pulse amount and multi vibrator mono stabile set of IC 555 as the oscillator of ultrasonic frequency, pulse amplifier through transistor BD 139. An ultrasonic transducer using transducer 400ST/R160 and micro controller AT89S51 is used for time setter. In the amplifier set of ultrasonic receiver, Op-amp CA 3204 is used. AT89S51 is used for time setter that is made repeatedly in order that the bounce may be read on oscilloscope through P1.0. After conducting an experiment, the effective working area frequency in pulse generator of ultrasonic wave is obtained in the frequency of 38.23 kHz. In the experiment on the amount of effective pulse, the maximum reach effectively is 16 pulses. In the experiment on the distance between two objects, the writer finds out that an instrument linier grade is 0.81773 against standard measurement with R=0.99954 and SD=0.457. Meanwhile on the material reflectivity test, the writer may concludes that the bigger material mass, the bigger its reflectivity. Keywords: pulse generator of ultrasonic wave, transducer

Rancang Bangun Alat Ukur Konduktivitas Panas Bahan Dengan Metode Needle Probe Berbasis Mikrokontroler AT89S52

BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (353.547 KB)

Abstract

A device for measuring thermal conductivity of  homogen materials using a Needle Probe method has been designed. This method uses a metal rod which emited a heat stream and a temperature sensor placed in the middle of interior heater at probe to measure changes in temperature inside the probe.            This measuring instrument represent development digitally from measuring instrument which have been made with analog system. With AT89S52 microcontroller application as data processor bases, temperature detected can be presented by sevent segment which have been controlled by BCD converter. Basically thermal conductivity measuring instrument with this Needle Probe method represent a digitally thermal detecting system which attached at Needle Probe. Every increase 1 0C, the temperature censor give output equal to 0.01 V with correctness of  displayed equal to 1 0C and error point level equal to 0.01 %. Key word: Needle Probe method, ADC, AT89S52 microcontroller, seven segment.

SISTEM AKUISIS DATA KOMPUTER PADA SENSOR ULTRASONIC RANGER UNTUK PENGUKURAN LEVEL MUKA AIR

BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (562.239 KB)

Abstract

This paper describes the method of ultrasound ranger development, data acquisition system and its characteristic than applied for automation water level distance measurement system using personal computer. This system is very important for recorded of water level data acquisition inlong time so data communication at measurement system.The system consist of ultrasonic distance sensor, microcontroller for time-of-flight counter and   serial interface,  and computer system fordata acquisition system. The microcontroller drive of sensor for generate of burst pulse. The 16-bitof counter of  microcontroller  was used for time-of-flight counter. Data was transmitted tocomputer twice at 8-bit of counter register. The microcontroller transmitted data at 9600 BPSusing UART protocols and slave-master for serial communication system. The communicationsystem was connected at voltage level communication RS232. The computer application of dataacquisition system was connected at COM port using Cport pellete in Borland Delphi. Thecollected data calibrated using standard.  The result of system characterization  have highmeasurement stability system at 99,61%, range of measurement distance at 10 cm to 280 cm,linear correlation with standard measurement at R = 0,9999, so it good for more application.Keywords : distance, pulse, counter, serial communication

Perancangan Model Pengukuran Jarak Menggunakan Computer-Aided pada Kontrol Kualitas Ultrasonografi

BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (79.884 KB)

Abstract

This research purposes are to do some quality tests through a distance measuring calculation using computer-aided system in a USG image projection and to analyze the distance measuring. In concerning with the design and its implementation, this research used digital tabulation method of image projection to compute and to analyze the distance measuring. The image value was established by variation of attenuation, TGC, and depth. Image tabulation was processed with ROI establishing and the cropping method. In depth variation, the average real distance of USG image resolution is 1 cm, the average value of vertical distance accuration of the image is 0.9747, thus the error value of the vertical distance accuration is 0.0253 cm or 0.253 mm or 0.253 % from the real distance and  the average value of the horizontal distance accuration of the image is 0.998 cm thus the error value of the horizontal distance accuration is 2x10-3 cm or 0.02 mm or 0.02 % from the real distance. For the variation of attenuation, the average value of vertical distance accuration of the image is 0.967 thus the error value of the vertical distance is 0.033 cm 0.33 mm or 0.33 %, and  the average value of the horizontal distance accuration of the image is 0.986 cm thus the error value of the horizontal distance is 0.014 cm 0r 0.14 mm or 0.14 %. Thus the error value for the vertical distance accuration is 0.031 cm or 0.31 mm or 0.31 % from the real distance. The result of the all tested components showed that the tested USG machine fullfiled the qualification of The American Association of Physicists in Medicine (AAPM) criteria. Keywords : USG, Quality Control, Distance Accuration, Computer-Aided

Analisis Keseragaman Citra pada Pesawat Ultrasonografi (USG)

BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (249.662 KB)

Abstract

The computer base system to determine uniformity of ultrasonography image quality has been developed at various attenuation(dB) and Time Gain Compensator (TGC).The equipment used in this study was 2-dimensional ultrasonic apparatus and multi-purpose multi-tissue phantom models 040GSE. Data collection was performed by scanning the phantom using a linear transducer with a frequency of 8 MHz. The mean and standard deviation of image density of it ROI calculated used computer base system then analyzed with trendline if the image density value in the range between mean and sd  it means image uniform. The result shows that the uniformity of the image is influenced the value of attenuation and TGC. This value increase proportional with increasing attenuation. For greater value of the TGC the uniformity tends downward. At 45-60 dB  obtained distribution image uniformity sd value is 0.20 and 0.28, and at minimum up to maximum TGC  obtained distribution image uniformity sd value is 0.33 and 0.48. This value can be used for quality assurance reference of USG equipment. Keyword : USG Equipment, Uniformity, Region of Interest, Digital Image Processing

PENGARUH GAIN TERHADAP FWHM DAN FWTM PADA CITRA B-MODE ULTRASONOGRAM (USG)

BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

Show Abstract | Original Source | Check in Google Scholar | Full PDF (301.284 KB)

Abstract

The effect of gain to The Width at Half Maximum (FWHM) and Full Width at Tenth Maximum (FWTM) on B-mode image ultrasonogram (USG) has been investigated. The aim of this research is to determine the effect of gain on the spatial resolution according the measurements of FWHM and FWTM. The evaluated resolution type is axial and lateral. This research used phantom multipurpose multi tissue with gain (30 dB, 35 dB, 40 dB, 45 dB, 50 dB, 55 dB and 60 dB) on frequency variation source 6,2 Mhz, 8 MHz dan 10MHz. The axial and lateral resolution images were obtained by using USG which uses B-Mode imaging. The measurement was made by using digital image and calculated objectively with MATLAB. The measurement of FWHM and FWTM was obtained from IP-PSF analysis (In Plane-Point Spread Function) using approximation for the Gaussian function. The result shows that there is influence from gain on FWHM and FWTM. The decreasing gain resulted in decreasing of FWHM and FWTM. The decreasing of FWHM and FWTM represents better spatial resolution, and vice versa. Keywords: FWHM, Gain, Point Spread Function, Spatial resolution, USG,

Co-Authors AB Susanto Achmad Widodo Adi Priyo Wicaksono, Adi Priyo Agung Chandra Prasetya Agung Nugroho Setiawan, Agung Nugroho Agus Indarjo Agus Sulistiyo Agus Suyanto Agus Syafrudin Agus Triyanto Ahmad Syaify, Ahmad Aini Moeljono, Aini AL. Supartinah, AL. Andika Bagus Setiawan, Andika Bagus Andri Wahyu Septo Putra Anifatur Nurjannah, Anifatur Arbiyanti, Yossi Norma Arfian, Finty Ari Anshori, Ari Ari Suwondo Arief Suseno, Arief Arif Syaifuddin Arifin Budi Putro, Arifin Budi Arinianzah, Aldo Rizqi Aris Wijayanti Arista, Desi Arlien Siswanti Arnefia Mei Yusnida Asfan Muqtadir, Asfan Astuti, Anjar Ave Gierdo Alfaseno, Ave Gierdo Baliyan I, Baliyan Bambang Nugraha, Bambang Basuki Basuki Bayu Surarso Budi Setiawan Chrisna A Suryono Chrisna Adhi Suryono Cicilia Artitin Cynthia Damayanti Dadang Sukandar Dayyana, Surya Desi Sandra Sari Desie Dwi Wisudanti, Desie Dwi Dewi Agustina Dewi Sulistyaningrum Dhidik Prastiyanto Diana Layla Dimas Putra Anugrah, Dimas Putra Djoko Adi Widodo Donny Prasetyo Santoso, Donny Prasetyo Drajat Martianto Dwi Puji Adiana, Dwi Puji Edi Wibowo Edi Wibowo Kushartono Edy Junaidi Eka Miftakhul Jannah, Eka Miftakhul Eko Supraptono Emi Agustina, Emi Endah Setiyaningrum Endang Sri Susilo ENNY SUSWATI Ervia Yudiati Evi Setiawati Fatekurohman, Mohamat fatimah Fatimah Febriana Tirta Kirana, Febriana Tirta Fitri Mahardika Sari Frida Fallo Gatot Murti Wibowo, Gatot Murti Gatot Yulianto Gentur Handoyo Gigih Budhiawan Gunawan Widi Santosa Hadi Endrawati Harindra W Pradhana, Harindra W Harindra Wisnu Pradhana Haryati Haryati Hayat Maulana Heri Sugito Heri Sutanto Hernita Kusuma Wardani Hery Sulistyo JNS, Hery Sulistyo Hery Widijanto Hidayat, Syarief Thaufik Hilmi Trian Setyawan Indhana Sudiharto, Indhana Indri Trifiantari Irianiwati Irianiwati Irwani Irwani Isa Nurnusanto, Isa Isnaini Isnaini Ivan Nurizal Sakti Izah, Luluk Lailatul Jatmiko Endro Suseno Jauhari Syamsiyah Joko Winarno Juniyanto, Dimas Kamasita, Systriana Esi Kartini Sinaga Kesawa Sudarsih Khanif Pramusinto, Khanif Kharis, Muhamad Kusworo Adi Kusworowulan, Suryati Kwartarini Murdiastuti, Kwartarini Laela Meitasari, Laela Laska, Yulinda Lukman Hakim Mahda Veronika Maisi, Sri Malau, Rotua Mardiyono Mardiyono Margo Utomo Marsetyawan HNES, Marsetyawan Mediawati, Saskia Mefi Priba Sari, Mefi Priba Melo, Gabriella Imanuella Melyana Nurul Widyawati Menur Wahyu Pangestika, Menur Wahyu Mohamad Nadhif, Mohamad Muh. Yusuf Muhammad Arif Prasetyo Muhammad Arsyad Suyuti Muhammad Izzuddin Shofar Muhammad Zainuri Mujiyo Mujiyo Mulyanto Mulyanto Munarso Munarso Muthoifin Muthoifin, Muthoifin N. Euis Sutaningsih, N. Euis Nailatul Ilmi Nasronudin Nasronudin Niharul Annas Nirwani Soenardjo Nourobby Aulada, Nourobby Oky Dwi Nurhayati Oky Yuripa Pradana P. H, Aditya Praptiwi Praptiwi Prasetyo Nugroho Raden Ario Radini Sinta, Radini Ragil Saputra Rahayu Sapta S Rahmat Gernowo Rakhmat Syaefullah Ramadhan, Hazbina Fauqi Rani Gamawati, Rani Ratna Dwi Meilani, Ratna Dwi Retno Handayani Retno Hartati Ria Amitasari Ria Azizah Rieneke L Sela, Rieneke L Rini Riyanti Robby Eko Christanto Rudhi Pri, Rudhi Rudhi Pribadi Rusdi, Muh Sangkertadi Sangkertadi Satryo Adi Wibowo, Satryo Adi Setyaningsih, Erni Sharfina Sharfina, Sharfina Siti Fatimah Muis Soeharyo Hadisaputro Sri Budi Barunawati, Sri Budi Sri Huning Anwariningsih Sri Kusumastuti, Sri Sri Sedjati Sri Sukamta Sudadi Sudadi Sudibyo Sudibyo Sugeng Purbawanto Sugiyanto Sugiyanto Sukarnen Sukarnen, Sukarnen Sulistyo Warjono, Sulistyo Sumarno Sumarno Sumaryo Sumaryo Suntoro Suntoro Supriyanto Supriyanto Supriyati Supriyati Suroyo Suroyo Suwarto Suwarto Tatyantoro Andrasto Tika Retnowati Tri Saputra, Tri Valentino, Nico Vifaldi Agti, Vifaldi Vincensius Gunawan Wahyu Fredi Santoso Wahyu Setia Budi Widyatmani Sih Dewi Wilis Ari Setyati Yosafat Hermawan Trinugraha, Yosafat Hermawan Yudha Nurdian, Yudha Yuli Hermansyah, Yuli Yuningtyastuti, Gita Surya