Filtering technique for image analysis

The measuring of the flocculation parameters is based on the analysis of the optical records obtained with the settling column. These records consist of images of aggregates or flocs grabbed with a digital camera. Flocs are lightened by means of a laser sheet coming from the side. The laser light is scattered by the flocs and recorded by the...

Gemiddelde en standaard deviatie van de optische extinctie door deeltjes in suspensie

Analysis of the alignment of a schlieren system for tele-operation

The schlleren observation technic[ue can be used in microgravity experiments. Alignment features for the gratings of a multiple source sharp focusing schlieren system have been analysed. Measurements have been performed to verify the theoretical predictions which show good agreement with the analysis results. The analysis allows for the...

Instruments used in the research on Cohesive Sediments

A research program was started to study the behaviour of cohesive sediments at the Delft University of Technology in 1989. As part of this project a well-provided physico-chemicallaboratory was built within the Hydromechanics Laboratory and adequate instrumentation was purchased. These new instruments and other instruments already present in the...

A study on focusing in telescience using the TELEPODI breadboard

Microgravity experiments operated using telescience concepts face certain constraints. The effect of these constraints on the focusing task are identified. Four types of focusing strategy, which provide a natural means of focusing in the presence of these constraints, are described. Three specific strategies are implemented as part of the...

Telescience pilot experiment results using telePODI: Final report

The Prototype Optical Diagnostic Instrument (PODI) has been extended to Teleoperated PODI (TelePODI) to allow for the study of telescience and image processing for microgee related instrumentation. TelePODI has been integrated in the Telescience Test Bed, phase I, at ESTEC to simulate remote control. Telescience pilot experiments have been...

Development of an optical diagnostic instrument. Final report. Part 1. Executive summary

An optical diagnostic instrument is being developed for fluid physics research in the microgravity environment of a space laboratory. The instrument offers a whole filed observation system with a Schlieren overlay combined with a local narrow field observation capability, the stake system. The latter allows for operation of a variety of optical ...

A preliminary study of a fluid science laboratory for space station (Columbus). Final report. Part 4. Executive summary

The report presents a design study, within a specified envelope of resources, of laboratory for scientific research on fluid material in a space station, A survey of the scientific background of mlcrogravity experiments identifies candidate investigations. A structured description of available facilities, or earlier design studies, provides a...

Sensors for a system to control the liquid flow into an evaporative cold plate of a two-phase heat transport system for large spacecraft

Two-phase flow heat transport systems (thermal busses) for the Columbus Space Platform and the Space Station are expected to incorporate systems to control the liquid flow rates into the evaporative cold plates. Such a control system consists of a sensor that monitors the cold plate (performance), a control algorithm and an actuator i.e. a valve...

Final report on a research facility for critical point phenomena in microgravity

A conceptual design for a research facility for critical point phenomena in Spacelab's microgravity environment is presented. In the critical point facility (CPF) four experiments can be performed in parallel. The CPF consists of five parts: four experiment units and a service module. The experiment units offer the user-provided (instrumented)...

Fluid physics instrumentation study: final report: part IV: executive summary, conclusions and recommendations

In the introduction of this Part the original objectives of the FPIS are recalled and the study strategy is indicated. Next chapters provide the logic and intermediate results as described in FPIS Final Report Part 1 System Aspects, Part 2 Detailed Design and Part 3 Breadboarding and Test Results. The final sections deal with important...

Warmteoverdracht door straling in een MHD generatorkanaal

Radiation heat transfer is a non-negligible physical process in an open-cycle magnetohydrodymic generator. It constitutes an important part of the energy conservation law, one of the fundamental equations describing the behaviour of the MHD combustion gas in the generator. Radiation heat transfer is modelled following the generally accepted...

Het gebruik van glasvezels in de vliegtuiginstrumentatie

Fiber optics, a rapidly advancing new technology, seems very well suited for use as data transmission medium in aircraft. The advantages are substantial: galvanic isolation, electromagnetic compatibility, savings in volume and weight, and superior transmission qualities. In this report possibilities and limitations are discussed for using...

Application of model following control and estimation techniques to attitude control of manoeuvring spacecraft Part II: Simulation software description

This document describes two computer programs developed during a study of the application of modern control techniques in the area of spacecraft attitude control. Theory and simulation results are described in part I of this report. In part II a general overview of the tasks of the simulation program is presented, and program design aspects are...

Methoden voor het meten van vervormingen aan constructies - Structural deformation: a comprehensive survey of modern measurement methods

The measurement of deformations remains an important discipline for the development and evaluation of structures. The report gives a survey of the most important measurement methods now available. Aspects of light which are vital for the understanding of optical methods are treated because these methods become more and more important. The...

Study of an attitude acquisition measurement technique using the ESA starmapper: Part I: Executive summary

The study deals with the rotational motion of a spin-stabilized spacecraft equipped with a V-slit sun sensor and the X-slit ESA starmapper. Assuming complete absence of an a priori attitude estimate, it is required to produce a rough estimate of the spacecraft attitude motion. It was assumed that sensor misalignments, external torques and...

Study of an attitude acquisition measurement technique using the ESA starmapper: Part two: final report

The study deals with the rotational motion of a spin-stabilized spacecraft equipped with a V-slit sun sensor and the X-slit ESA starmapper. Assuming complete absence of an a priori attitude estimate, it is required to produce a rough estimate of the spacecraft attitude motion. It was assumed that sensor misalignments, external torques and...

Non-destructieve bepaling van gewaseigenschappen met behulp van multispectrale scanning

The spectral distribution of radiation reflected by crops in the visible light region and the near infrared contains information concerning crop structure and the optical properties of the leaves and the bounding soil. Non-destructive determination on remote distance of crop properties by means of the measured spectral distribution of reflected...