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> >>V1.40 of Abyss (still in Beta testing) adds a thermal compensator to >>our model. This allows for progressive cooling and warming over the >>course of the dive, and adds penalties or bonuses to the resulting >>deco as is appropriate. > >I assume that this models the body as one single object at some >"temperature", NOT as different objects at different temperatures that >are connected physically and exchanging gas via perfusion through >tissues and blood flow. Correct. We are only able (at this time) to evaluate thermal loss on a body wide basis. > >How do you determine the "temperature" and perform the compensation, >is this simply some type of "user input" - what kind of input - do you >ask water temp, type of insulation (e.g. 1/4" wetsuit, drysuit with >xyz woolies, etc)??? > We ask the following questions to determine your thermal status. 1. Current Water temperature. 2. Current workload (on a scale of resting to extreme). 3. Dive Suit, wet (size 1-7mm) or Dry (insulating or non) 4. Underwear type, if Dry suit. 5. Hood type 6. Gloves type 7. Are you using Supplemental heat, Eletrical, Chemical. 8. Are you using a rebreather. 9. If dry suit, is it Argon filled. 10. Personal cooling propensity, faster/average/slower than most divers. >The biggest problem with something like this is it's NOT in a computer >performing real time calculations but must be *assumed* up front and >could be different in real world conditions due to unexpected changes >in weather patterns. BUT, we are working on the computer right now. God willing, we will have an Abyss Mixed Gas computer for sale in 1996. And possibly a demo on display at TEC96. on Monday we are supposed to have a final decission from the OEM on production. >Even in a computer performing these >calculations, there would have to be temperature probes in order to >really determine what the diver is experiencing. Simply sampling the >water temp really isn't sufficient. Different bodies and circulatory >systems react differently to "cold". By actually measuring the temp >on the body you would at least remove one of these variables, but I'm >still not sure if that would be sufficient (better, yes). Agreed. But that takes us back to the sub-clavical doppler. if you could have one "installed" in you, with software good enough to make gradient determinations on the fly, we could really begin to have fun with deco table generation <G>!! Step by step we are getting closer to real-time induvidual deco. We are not there yet, but we are a heck of a lot closer than we were 5 years ago. Christopher M. Parrett, President, Abysmal Diving Inc. Makers of ABYSS, Advanced Dive Planning Software. 6595 Odell Place, Suite G. Boulder CO, 80301 Ph, 303-530-7248, Fx, 303-530-2808 ftp://abysmal.com/users/abysmal http://www.emi.net/boynton/abyss/abyss.html
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