Active Vibration Isolation System to Improve Free Space Optics Communication
A Free Space Optics (FSO) link consists of a transmitter and a receiver telescope which requires a continuous alignment for successful transmission of data. However due to certain factors, misalignment could occur between the transmitter and receiver tele
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Active Vibration Isolation System to Improve Free Space Optics Communication Asan G. A. Muthalif, Khairiah K. Turahim and Syazwani Ab. Rahim
Abstract A Free Space Optics (FSO) link consists of a transmitter and a receiver telescope which requires a continuous alignment for successful transmission of data. However due to certain factors, misalignment could occur between the transmitter and receiver telescope which later interrupts data transmission. One of the factors that contribute to this misalignment is unwanted vibration at the transmitter or receiver. This paper outlines the design and implementation of an active vibration isolation system prototype to tackle the problem of misalignment caused by vibration for an FSO communication. A prototype is fabricated and a control system is implemented with an objective to suppress vibration coming to the top plate where the transmitter or receiver will be placed. By applying an LQR controller to the system, a reduction of 25.8 % of plate displacement and 49.2 % of amplitude of frequency is achieved at excitation frequency of 12 Hz. Keywords FSO
LabVIEW LQR Active vibration isolation
A. G. A. Muthalif (&) K. K. Turahim S. Ab. Rahim Faculty of Engineering, Department of Mechatronics Engineering, International Islamic University Malaysia, Jalan Gombak, 53100 Kuala Lumpur, Malaysia e-mail: [email protected] K. K. Turahim e-mail: [email protected] S. Ab. Rahim e-mail: [email protected]
W. Lu et al. (eds.), Proceedings of the 2012 International Conference on Information Technology and Software Engineering, Lecture Notes in Electrical Engineering 211, DOI: 10.1007/978-3-642-34522-7_40, Ó Springer-Verlag Berlin Heidelberg 2013
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40.1 Introduction Free-space optics (FSO) communication is a technology that uses air as its medium of transmission. The transmission process using FSO is relatively simple. It only needs a laser transmitter and receiver. Each FSO system uses a high-power optical source such as laser and a telescope that transmits light through the atmosphere to another telescope which acts as a receiver. An FSO link refers to a pair of FSO telescope, each aiming a laser beam to the other. Hence, one telescope has dual capability to act as a laser transmitter as well as a receiver [1]. In most cases, these telescopes are installed on top of buildings for free space communication. For an FSO link to successfully transmit data, it requires a continuous alignment between the transmitter and receiver. Misalignment happens due to movement of the transmitter and receiver from the common line of sight and which causes a decrease in the received signal intensity, which eventually increases the bit error probability (BEP) [2]. One of the key challenges with FSO systems is maintaining the alignment of transmitter and receiver. Buildings are constantly subjected to various sources of motion due to thermal expansion, wind sway and vibration. Therefore an FSO link mounted on top of buildings is also exposed to this mot
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