|
 07.05.2012 - Rebreather Forum 2 is considered to be a milestone event in rebreather diving. Now, 16 years later, experts from all over the world gather together and discuss latest developments in the field of rebreathers. Arne will present failure modes of O2 sensors, design of embedded systems in rebreathers and gives an insight in latest research results sensor technologies. More details can be found here.
|
|
|
 21.12.2011 - Arne is talking about advances in o2 sensor technologies for rebreathers. In particular he discusses sensor failure modes and latest research results in the field of solid state electrolyte sensor technologies. More details can be found here.
|
|
Journal of the Society of Underwater Technology 29(4) |
|
 31.03.2011 - In the March issue of the Journal of the Society of Underwater Technology (Issue 29:4) we have published 2 articles: One about speed optimisations of the VPM-B decompression model and one about head up displays.
Abstract 1: "The calculation of a decompression schedule, according to the Varying Permeability Model (VPM) with Boyle’s Law compensation extension, requires many sophisticated arithmetic operations. Therefore if it is calculated with a limited arithmetic instruction set on a microcontroller, a decompression schedule cannot be calculated in an acceptable time frame. This paper describes the principles behind an optimisation in calculation speed of the VPM with the Boyle’s Law compensation extension for the determination of decompression schedules on a low power microcontroller. It was accomplished in three independent steps: converging the cubic root equation of the Boyle’s Law compensation algorithm; using a set of predictive models to calculate the adapted bubble radius without using a cubic root solver; and pre-calculating the exponential terms of the Haldane and Schreiner equations, in order to reduce processing time and dynamic adjustment of the step size within the iterative process of the decompression schedule calculation. The modified algorithm was tested on an Atmel ATmega644P running at 8MHz. Calculating decompression schedules with these enhancements were approximately five times faster than with the original algorithm."
Abstract 2: "Head-up displays (HUDs) are mounted in the field-ofview in close proximity to the eye. The present work describes the development of HUDs for rebreather diving. The developed HUDs feature a micro-screen instead of LED-based systems found in nearly all existing available commercial units. Two mouthpiecemounted prototypes were developed. However, this approach turned out to be impractical and a better solution was found with mounting the HUD directly onto the diver’s mask. A split optical path, where the HUD is glued to the visor, and a small lens located inside the diving mask were key features enabling a compact and lightweight design while, at the same time, withstanding pressure and water ingress."
Get the papers here |
|
|
UT² - The magazine of the Society for Underwater Technology |
|
 21.04.2011 - A short article, describing our work, was published in the current issue of UT², the magazine of the Society for Underwater Technology. The online version of the magazine is free and can be found here. Read the article here.
|
|
A review of the use of closed-circuit rebreathers for scientific diving |
|
 29.09.2010 - A paper about the review of the use of closed-circuit rebreathers for scientific diving is published in the current issue of the Journal Underwater Technology Vol. 29(2).
Abstract: "Rebreather diving systems have many advantages to standard open-circuit systems (or SCUBA). Re-breathers offer higher gas efficiency together with silent and bubble-free diving. Moreover, instead of cold and dry gas found in open-circuit systems the diver takes advantage of a warm and humid breathing gas. Stealth (through silent, bubble-free diving) can be beneficial for scientists exploring a range of natural ecological research areas. The high gas efficiency of rebreathers, combined with their lower operational costs, can provide longer autonomy and shortened decompression obligations that may assist the scientist with deeper diving explorations. The present paper gives an overview of today's rebreather technology and focuses especially on the needs of scientific divers. Moreover, it includes a short report about achievements in the field of deep coral explorations, where advanced electronically-controlled closed-loop rebreather systems were the key for efficient and successful missions."
Get the paper here |
|
|
|
|
|
|
Page 1 of 2 |
High resolution ECG