In this paper we report our progress on the development of a spatially and spectrally multiplexed LPG-based fiber-optic sensor that uses an InGaAs CCD linear array and a diffraction grating for the detection of spectral changes. Three 1x2 fiber-optical switches are used to realize a system of spatial multiplexing of four sensing channels. Up to three LPGs can be connected in series in each channel. The end grating of each channel has a fiber reflector spliced to it and the reflected signals are directed to the detection unit via a circulator. To test the system bending and external refractive index changes have been traced.
In this article we analyse different methods for remote non-contact counting of moving objects at different speeds: video, mechanical, optical, ultrasonic. The principles of their implementation, advantages and disadvantages are described and the reliability of information processing methods is evaluated. A model of road traffic measurement and analysis system is presented. It is specially emphasized on application of different sensors in real-time data acquisition, management and analysis of traffic intensity.
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