Doppler Measurements

[BigTuna]

How are doppler bubble measurements made? I'm imagining somebody listening to a hiss with a stethoscope and estimating the noise level on a qualitative scale.

Do you have a link to photos or articles on the subject? Can the measurements be made during a dive? What kind of training or certification is needed to make doppler measurements--doctor, scientist, anybody?

Is there someplace I can go to see measurements being made? Can I have post-dive measurements made on me so I can directly appreciate the effects of surface interval, no-stop, 3-min stop, 5-min stop, and deep stop? It would be interesting to calibrate myself against the tables and best practices, which are "generic."

Is there a way to get into a zen-like zone and sense my own declining bubble cascade after a dive? I've read that George Irvine is able to do this.

 

[Gene_Hobbs]

Investigation of New Principles for Human Decompression Schedules Using Doppler Ultrasonic Blood Bubble Detection.
Spencer and Johanson. 1974 ONR Report.
http://archive.rubicon-foundation.org/3788

Use of Doppler by ScubaBoard's own Dr. Deco.
The Pathophysiology of Decompression Sickness and the Effects of Doppler Detectable Bubbles.
Powell and Spencer. 1980 ONR Report.
http://archive.rubicon-foundation.org/3860

The two papers below are Dr. Deco's work in the development of the DSAT Dive tables.

Doppler ultrasound monitoring of the gas phase formation following decompression in repetitive dives.
Powell, Spencer, and Rogers. 1988 DSAT Report.
http://archive.rubicon-foundation.org/4229

Development and validation of no-stop decompression procedures for recreational diving: the DSAT recreational dive planner.
Hamilton, Rogers, and Powell. 1994 DSAT Report
http://archive.rubicon-foundation.org/4228

And if this is not enough... search for Doppler

 

[Dr Deco]

Hello Big Tuna:

Alas, there is not anywhere that you can hear bubbles nor is there a class that teaches this.

A decade ago, there was a class in Houston, Texas, that did teach this – I was one instructor.

That class was a one-time deal. To get a good feeling for hearing bubbles, one needs an altitude chamber. It is only in one of these that bubbles can be regularly generated in a safe manner in human subjects. Otherwise, there is the reading material listed above. :1book:

Dr Deco :doctor:


The next class in Decompression Physiology for 2007 is August 18-19.
This class is at the USC campus in Los Angeles.
http://wrigley.usc.edu/hyperbaric/advdeco.htm