Fiberoptic gas sensor is a novel sensor,a performance of methane sensor is analyzed and tested from the aspect of the fiber[CD*2]optic link loss,driving technology light source and output waveform of the phaselocked amplification circuit,methane absorption and etc in this paper.

This paper analyses and researches the solve method for optical link loss and optical divide ratio in star optical fiber networks,introduces the solve clue,method and steps by the examples for optical divide ratio of every optical distributor and for optical link loss of the entire network in complicated star optical fiber networks.

This paper analyses and studies the structure of star optical fiber transport network, reaches the algebraic relationship of optical link loss between single star optical fiber network and multiple star optical fiber network, and presents the calculation forma of optical divide ratio of optical distributors.

This paper studies the relationship between maximum number of optical fiber lines and permissible optical link loss in single star optical fiber network.

After the reliability and security of distribution network are ripe day by day, it becomes an important work to reduce the line loss for distribution network.

Lower line loss is an important work for power supply section.

From four aspects of the reduction of the line losses,the economic operation of the transformers,the increase of the power factor for loss reduction and the compensation of the reactive power,this paper discusses how to improve and increase the economical efficiency of the power supply system for increasing the utilization efficiency of the electric energy.