In this paper excitation characteristics of the Liquid Crystal (LC) capacitive chemical and biological sensor are examined and the optimum frequency and voltage range for the sensor interface are introduced. Interdigitated capacitor has been used for the sensor capacitance measurement and two different molecular orientations, homeotropic and homogenous, have been considered. The LC sensor capac...

It is well-known that the Interparticle interactions between adsorbates and surface of an adsorbent can affect the surface morphology. One of the consequences of this issue is that the resonant frequency of a nanoscale resonator can be changed due to adsorption. In this study we have chosen a cantilever-based nanoscale mass-sensor with a single nanoparticle at its tip. Using the classical...

A high-voltage sensor was developed by driving optical fibre Bragg gratings, mechanically fixed along the radial direction, with a conventional piezoelectric disc. A wavelength shift modulation is obtained as a result of the converse piezoelectric effect. The measured output signal is linear. The voltage upper limit depends on the type and thickness of the piezoceramic. A sensor built with a di...

In this paper a new type of sensor data input for mobile robot localisation is proposed. Sensor images are taken from two ground-facing cameras mounted on either side of the robot. The affine transformations between image pairs, computed using the phase correlation method, are used to estimate the motion of the robot. Results on a plain coloured carpeted surface, show that the proposed method p...

This chapter is to focus on an Agent based approach to Multi robot control using type -2 fuzzy and Ant colony optimization. Type -2 fuzzy interval controllers was applied to the autonomous robot in order to handle uncertainty in a better way and ant colony optimization technique has been used for an optimized path planning in traffic environment with more number of robots. Both Agents based and...

Immersion-type AE sensor is needed for corrosion monitoring of underground gasoline tanks. We are developing a multi-directional optical fiber AE sensor to monitor the longitudinal AE signal through liquid (liquid-borne AE). The developed AE system is an optical-fiber-based Mach-Zender-type laser interferometer using a weak laser and is intrinsically safe. Multi-sensing function was facilitated...

In this paper we focus on the application of reinforcement learning to obstacle avoidance in dynamic Environments in wireless sensor networks. A distributed algorithm based on reinforcement learning is developed for sensor networks to guide mobile robot through the dynamic obstacles. The sensor network models the danger of the area under coverage as obstacles, and has the property of adoption o...

One of the most important and typical application of wireless sensor networks (WSNs) is target tracking. Although target tracking, can provide benefits for large-scale WSNs and organize them into clusters but tracking a moving target in cluster-based WSNs suffers a boundary problem. The main goal of this paper was to introduce an efficient and novel mobility management protocol namely Target Tr...

Sybil attacks pose a serious threat for Wireless Sensor Networks (WSN) security. They can create problems in routing, voting schemes, decision making, distributed storage and sensor re-programming. In a Sybil attack, the attacker masquerades as multiple sensor identities that are actually controlled by one or a few existing attacker nodes. Sybil identities are fabricated out of stolen keys, obt...