We have designed and realised a micromachined micro Coriolis flow sensor for the measurement of hydrazine (N2H4, High Purity Grade) propellant flow in micro chemical propulsion systems. The sensor should be able to measure mass flow up to 6 mg/s for a single thruster or up to 24 mg/s for four thrusters. The sensor will first be used for measurement and characterisation of the micro thruster sys...

Selectivity and low power consumption are major challenges in the development of sophisticated gas sensor devices. A sensor system is presented that unifies selective sensor-gas interactions and energy-harvesting properties, using defined organic-inorganic hybrid materials. Simulations of chemical-binding interactions and the consequent electronic surface modulation give more insight into the c...

The paper investigates the theory of operation of a passive millimeter-wave seeker sensor using a fast electronic sequential-lobing technique and the experimental validation obtained through laboratory trials. The paper analyzes in detail the theoretical performance of a difference channel sensor and a pseudo-monopulse sensor deriving agile formulas for the estimation of target angular tracking...

Chemical sensors are becoming more and more important in any area where the measurement of concentrations of volatile compounds is relevant for both control and analytical purposes. They have also found many applications in sensor systems called electronic noses and tongues. This chapter will first consider fundamentals of sensor science including a brief discussion on the main terms encountere...

In this paper shows the basic concept on sensor networks, which has been made feasible by the convergence of micro electro-mechanical system, wireless communication and digital electronic. At first the sensing charge and the potential sensor network applications are shown. The communication structural design for sensor network also delineated. The algorithm and protocols of the sensor network a...

A small embedded vision sensor has been developed using Field Programmable Gate Arrays (FPGA) technology. The sensor computes optic flow using a streaming version of the image interpolation algorithm to provide flow vectors at 36 equally spaced locations in a 1024×768 pixel image. The sensor has been tested in flight on an unmanned helicopter and benchmarked against GPS measurements of velocity...

The parameters of gas-liquid two-phase flow bubbles in field coalbed methane (CBM) wells are of great significance for analyzing coalbed methane output, judging faults in CBM wells, and developing gas drainage and extraction processes, which stimulates an urgent need for detecting bubble parameters for CBM wells in the field. However, existing bubble detectors cannot meet the requirements of th...

In this paper, a novel fiber turbine flow sensor was proposed and demonstrated for liquid measurement with optical fiber, using light intensity modulation to measure the turbine rotational speed for converting to flow rate. The double-circle-coaxial (DCC) fiber probe was introduced in frequency measurement for the first time. Through the divided ratio of two rings light intensity, the interfere...

Angular rate is a piece of useful information for the attitude control spacecraft. The star tracker as space optical sensor can be used to measure angular In this paper, novel approach proposed improve measurement accuracy during spacecraft rotation. electronic rolling shutter (RS) imaging mode complementary metal-oxide semiconductor (CMOS) image in applied obtain much higher sampling frequency...

This paper describes the work done in an attempt to integrate ultrasonic sensors in micro-fluidic channels. We have developed a system with fluidic channels having embedded zinc oxide transducers. A zinc oxide film is deposited on a glass substrate and is sandwiched between two electrodes. The transducers made are found to resonate at 400 MHz in thickness mode. The channels are made both from P...