Ditemukan 18 dokumen yang sesuai dengan query
Hidjan
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ABSTRAK
Tujuan dari eksperimen yang dilakukan adalah untuk menyelidiki hal-hal yang berkaitan dengan pembentukan plasma, yakni zat yang tersusun dari muatan-muatan listrik bebas berupa ion-ion positif dan elektron elektron negatif yang jumlahnya nyaris sama.
Plasma yang digunakan dalam eksperimen terbentuk dari udara laboratorium yang di iradiasi dengan berkas laser energi tinggi ( IJ - 2J ) dalam sebuah chamber yang dilengkapi dengan suatu rangkaian listrik DC.
Dengan memberikan beda tegangan tertentu antara dua elektrode yang berada dalam chamber, ...
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Depok: Fakultas Teknik Universitas Indonesia, 1994
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
Suroso
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ABSTRACT
As transmission medium in optical communication system, optical fiber is also characterized by elastic properties beside of transmission properties of optical fiber. The Young Modulus of Elasticity of optical fiber could be measured by considering a bare optical fiber as cantilever which resonant with an acoustical vibration. To detect the cantilever vibration, a HeNe laser light is launched into the cantilever of optical fiber through its free end and the output laser light ...
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1992
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
Samuel H. Tirtamihardja
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ABSTRACT
Data acquisition system using diode array for a spectrometer has been designed and constructed. The light detection is performed by a photodiode array consisting of 512 photodiodes. The superior quantum efficiency of the detector and the direct increase of optical flux with photodiode electrons make it works as a very fast detector. This detector is supplemented with a charge-coupled device working as a shift register for the array, and as a result each light spectrum ...
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1989
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
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
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
Wahyu Setia Budi
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ABSTRAK
A compact, simple and low-cost transversely excited atmospheric (TEA) pressure ultraviolet nitrogen laser {337 nm) has been designed and constructed employing the conventional Blumlein circuit. The measured energy of the output pulse of 337 nm is around 80 -J at 25 kV of charging voltage and l atm operating gas pressure. The beam divergence is found to be 7.7 mrad horizontally and 1.5 mrad vertically. The energy output decreases slightly with increasing gas pressure and ...
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1992
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
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
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
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
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
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
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
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
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
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
T-Pdf
UI - Tesis Membership Universitas Indonesia Library
