REPAIR AND REFURBISHMENT OF ELECTRON CURRENT DENSITY METER(ECD) BAIKPULIH DAN PENAMBAHBAIKAN ALAT ELECTRON CURRENT DENSITY METER

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1 REPAIR AND REFURBISHMENT OF ELECTRON CURRENT DENSITY METER(ECD) BAIKPULIH DAN PENAMBAHBAIKAN ALAT ELECTRON CURRENT DENSITY METER Lojius Lombigit 1, Leo Kwee Wah 2, Ishak Mansor 1 1 Bhg. Perkhidmatan Teknikal 2 Bhg. Projek Khas Institut Penyelidikan Teknologi Nuklear Malaysia (MINT) Bangi, KAJANG, MALAYSIA lojius@mint.gov.my Abstract Electron Current Density Meter(ECD) is used for radiation dose measurement of an electron beam machine. It detects the heat produce by electron beam and converts it to electrical signal in the form of current. The electrical current value then used to calculate the dose of the electron beam. The original system consists of a charge collector (thermistor), motion control system, GPIB interface and data processing PC using Japanese software. The data processing PC and software were out of order and outdated for the current requirement. The repair and refurbishment project involving the upgrading of the GPIB interface, redesigning the motion control system and software for data collection and manipulation. This is done by using the NI-GPIB, motion control software and LabVIEW 7.1 Programming from National Instruments. Abstrak Alat Current Density Meter digunakan untuk mengukur dos sinaran bagi sebuah mesin Alurtron. Alat ini mengesan haba yang terhasil akibat sinaran alur electron dan menukarkan haba tersebut kepada arus elektrik yang akan digunakaan dalam pengiraan dos sinaran alur elektron. Komponen asal alat ini ialah pengesan(termistor), sistem kawalan motor, sistem antaramuka GPIB dan sebuah komputer pemprosesan data yang menggunakan perisian dalam bahasa Jepun. Sistem pemprosesan data bagi alat tersebut telah rosak dan tidak lagi sesuai untuk kegunaan semasa. Projek baikpulih dan penambahbaikan alat ECD melibatkan naiktaraf antaramuka GPIB, merekabentuk semula perisian sistem kawal motor dan perisian untuk pemprosesan data. Projek ini direalisasikan dengan menggunakan NI-GPIB, Perisian kawalan motor dan LabVIEW 7.1 daripada National Instruments. Keywords/Kata kunci: Repair and refurbishment, Current Density Meter, Motion Control, GPIB and LabVIEW 7.1 INTRODUCTION The electron current density meter (ECD) is used for measuring the fluence and current density of electron beams[2]. The original system was developed under UTN-JICA project. It comprises of charge collector, motion control system to control the movement of the charge collector and measuring apparatus connected to a pc via GPIB interface. The original computer/workstation and motion control driver module suffered major damage and beyond repair. Original software for data processing and manipulation also corrupted. After troubleshooting and testing, we found that the stepper motor, GPIB interface card and measuring apparatus still functions. Figure 1 shows the block diagram of the ECD system. The goal of this project is to repair and refurbish the ECD system with new hardware and

2 develop a software that can control the movement of the charge collector, acquire the data and present the data in X-Y plot (Current vs. position). The development of the system consist of two main stages; hardware development (power supply, stepper motor driver module and GPIB interface) and software development using Lab VIEW Hardware development We develop the stepper motor driver module by using a bipolar stepper motor driver, 5V DC power supply to power the circuit, connectivity terminal board UMI-7764 and windows based workstation PC. This module is connected to PCI motion controller card (NI-PCI 7342) inside the workstation PC. Motion controller card generate the desired pulse to control the stepper motor. Figure 2 shows the stepper motor driver module diagram. We use GPIB interface (NI-488.2) to acquire the current value from the ECD Measuring apparatus. 2. ECD Software Development The ECD software consists of two main modules; motion control and data acquisition software. The function of the motion control module is to control the movement stepper motor and the data acquisition modules acquires, manipulates and display the data. The development was done by using Lab VIEW 7.1 software. We develop two set of instruction; FIND HOME and ECD SCAN function using the flex motion toolkits. The FIND HOME functions are used to move the charge collector to HOME position and to reset the controller. ECD SCAN function used during the normal operation. By using the ECD SCAN function, we can set the scan length. The motion control software codes develop using LabVIEW 7.1 shown on figure 3. NI (GPIB) and Excel LabVIEW toolkits are used to develop the data acquisition and data processing software. The Motion control and Data acquisition software run parallel to acquire the current value while the charge collector move. Figure 4 shows the complete software for the ECD system. RESULT AND DISCUSSION The original hardware such as Workstation PC, GPIB interface card and stepper motor driver board are faulty. We have to design a new power supply to accommodate the power requirement of the new stepper motor driver circuit. The original ECD measuring apparatus use GPIB interface to secd the data to the workstation PC. We have to replace the original GPIB interface card to National Instruments NI-GPIB card because it compatible with MS Windows operating system. The old ECD software was develop by JICA, it written in Japanese language and no backup installation available so we have to design new software. We use LabVIEW 7.1 software for the development works because it much easier to program, driver and example code also available at national instruments website. Future works need to be done on verifying the performance of the new ECD system because we still maintain the old electronics such as measuring circuit and charge collector (Themistor). Some of these components need to be recalibrated. The performance of the new ECD system need to properly tested and it done by running a complete operation of the ECD system with the supervision of an expert on high dose dosimeters especially on total absorption calorimeter technique.

3 Format of JSNM's Manuscript FIGURES Charge Collector M Stepper Motor ECD + GPIB Interface Motor Driver and Power supply Workstation Figure 1: Block diagram of an ECD System From Limit switch Black Purple Orange CONNECTIVITY TERMINAL UMI-7764 GND Fwd Limit Home Axis 1 Step(CW) Di r+5v GND 5V GND From Stepper Motor Green Black Red Brown CL B- B+ A- A+ EN DI Stepper Motor driver COM AC1 AC1 TR1 INPUT PULSE FROM MOTION CONTROLLER AC power 5V Regulator TR2 Figure 2: Stepper motor driver module board diagram 3

4 figure 3: Motion control software

5 Format of JSNM's Manuscript Figure 4: Complete front panel and LabVIEW codes for ECD software. 5

6 CONCLUSION In conclusion, many obsolete, faulty and unwanted equipment in MINT, which can be repaired or refurbished with the right technology so that it can be used for the current requirement. By doing the repair and refurbishment project it reduce budget for buying new equipment. Acknowledgements The authors acknowledge KUMPULAN ALURTRON for providing the opportunities to repair and refurbish the ECD machine. We also would like to thank Mrs. Site Amish Has him and Dr. Norah Ali for their contribution and ideas for this project. REFERENCES [1] Single axis test.flx, National instruments example code. [2]. Report : Noriah mod Ali, Dosimetry associated with electron beam facility.irpa: (INDUSTRY)-STANDARDIZATION OF RADIATION DOSE MEASUREMENTS

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ISU DAN CABARAN PELAKSANAAN SISTEM PENGURUSAN KESELAMATAN MAKLUMAT (ISMS) 15 Jun 2016 Dewan Taklimat Serdang

ISU DAN CABARAN PELAKSANAAN SISTEM PENGURUSAN KESELAMATAN MAKLUMAT (ISMS) 15 Jun 2016 Dewan Taklimat Serdang 1 TARIKH AUDIT Audit Dalaman Sistem Pengurusan Keselamatan Maklumat (ISMS) Universiti Putra