Ditemukan 20 dokumen yang sesuai dengan query
Bernadus Hariadi Chrismastoro
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Characterizations have been performed on single stage Transversely Excited Nitrogen Laser of Blumlein type. Optical cavity arrangement is varied prior to measurement which shows no significant increase in energy on both configurations of inserting a mirror only and a pair of mirror and a quartz parallel plate. Frequency repetitions respond reveals a small drop in energy at higher frequency i.e. 10 Hz by a factor of 20%. N2 flow rate consideration behaves on the similar ...
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Depok: Program Pascasarjana Universitas Indonesia, 1994
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Siswayudi Azhari
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A spectrometer application of time resolved method spectroscopy has been used in many times of experiment on physical of atomic, molecule and ionized plasma behavior. This paper is completed to make experimental work easier in reading and processing of datum. Using PC and interfaces can make signal convert to digital signals and it can save for long time in a very popular magnetic media. So, we can recall specific signal datum to re analyze or ...
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Depok: Program Pascasarjana Universitas Indonesia, 1994
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Marpaung, Mangasi Alion
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ABSTRAK
An N2 laser system that consists of transversely excited atmospheric (TEA) oscillator and transversely excited (TE) amplifier has been designed and constructed. The laser system employs single common spark gap for both oscillator and amplifier. The optimum operating voltage is 15 kV at 2 Hz repetition rate. The measured energy of the output oscillator-amplifier system has maximum value of 55 pJ and beam divergence of 2 mrad horizontally and 1 mrad vertically.
Synchronization between ...
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1993
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Dede Sujadi
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Computer simulation program has been developed on the basis of Liapunov approach for the study of MRAC technique applied to pressure control for a vacuum system. Both proportional and integral feedback as well as disturbance feedforward is considered in the closed-loop system. The simulation result obtained with a personal computer demonstrates that this MRAC technique is feasible and provides effective and satisfactory control despite its poor initial control policies and wide range of choice for ...
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Depok: Universitas Indonesia, 1989
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Sunarto
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A fluorescence spectrometer, with gating PMT (Photo Multiplier Tube) has been designed and constructed for the observation of Time Resolved Spectroscopy. Employed as a source far the fluorescence spectrometer a pulsed N2 lasers with about 5-nanosecond pulse width and 400-kilowatt power. Gating PMT carries out the sampling. In this method some of the dynodes of the PMT are being biased at voltages below normal operating voltage, while the other dynodes are held at their normal ...
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Depok: Fakultas Teknik Universitas Indonesia, 1988
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M. Yunil
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ABSTRACT
A vacuum chamber has been designed and constructed for the observation the primary plasma and secondary plasma which is generated by the bombardments of brass by N2 Laser beam with about 5 ns pulse width and 1 1W power.
The Radius and spectral emission of the resulting secondary plasma of the brass sample at the surrounding gas pressure range 2 and 8 torr in N2, is presented.
This study can be developed to ...
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1988
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Lantu
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ABSTRAK
The design and construction of eight-bit tune delay autocorrelator is discussed, suitable for use in photon correlation experiments. The sampling time of the correlator can be varied from 1 usec to 100/usec, devide into a number ( typically 256 ) channels (time interval). The instruments records the number of pulses occuring in each sampling time and is stored in location memory in a RAM-BANK. The data is stored in binary form,
the data can be converted ...
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1987
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Ering Poernomo Setianto
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ABSTRACT
The principles of frequency stabilization is to keep constant the optical path length in laser cavity by controlling the laser- tube length. In this system used temperature servo control to control the laser tube length.
As reference to an error derived by a sensitive frequency discriminator. Basically the operation of this sensitive frequency discrimantor utilized the longitudinal Zeeman Laser, which splits atomic gain profile.
When a longitudinal magnetic field is applied to an internal mirror of single ...
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Depok: Fakultas Teknik Universitas Indonesia, 1988
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Benyamin Kusumoputro
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A computerized intensity detection system has been designed
and constructed using single board TK-85 microprocessor system.
Two types of hardware architectures, Address Mapped and Memory
Mapped Input-Output systems are utilized as Input module from
light detector and Output module to X-Y recorder, respectively.
A performance test on the computer system has shown that the
system hardware and software function properly with consistent
gain -of l.36O. An educational grating- used for the overall
performance test has also indicated instrumental accuracy
consistent with design limitation. A ...
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Jakarta: Fakultas Teknik Universitas Indonesia, 1983
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Wagini R.
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ABSTRACT
Many alkali halides crystal develop new absorption bands upon exposure to ionizing radiations. the absorbing centers responsible for these bands are called "Color-Centers". De Boer 1937 was proposed a model for one of the color centers, is called the "F-Center" which consisted essentially of an electron trapped at the position a missing halogen ion (halogen ion vacancy). with the recognition of the highly mportant influence of structural imperfection or defect (Frenkel and Schottky defects) on ...
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1991
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