Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Development of Time Measure System for Acceleration of Gravity Experiment

중력 가속도 실험을 위한 시간 측정 시스템 개발

  • Lee, Hyeon-Hee (Department of Electric, Electronic & Information Engineering of Wonkwang University) ;
  • Kim, Seong-Gon (Department of Electric, Electronic & Information Engineering of Wonkwang University) ;
  • Chin, Dal-Bok (Department of Electric, Electronic & Information Engineering of Wonkwang University)
  • 이현희 (원광대학교 전기전자 및 정보공학부) ;
  • 김성곤 (원광대학교 전기전자 및 정보공학부) ;
  • 진달복 (원광대학교 전기전자 및 정보공학부)
  • Published : 2002.07.10
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Abstract

This study is to develop a time measure system for acceleration of gravity verification. The system can measure time interval between two points when an object passes through the points. The system has 1${\mu}$sec time resolution. The AT90S8515 microprocessor, product of ATMEL. can make 1${\mu}$sec time resolution possible connected with the 8 MHz fine crystal oscillator. The two external signals called 'start' and 'stop' have AT90S8515 that counted time intervals of the two signals. Sensors are composed of the IR beam emitting diode. TNL108 and the IR beam receiving photo diode, TNL601, produced by NEC company. In order to acquire the measurement of exactitude of the system, measure the pendulum period. Experimental result, the average period =3.0406sec with pendulum length of 2.314m. The acceleration of gravity g=$908821{\pm}6.416{\times}1^{-4}m/s^2$.

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