flow velocity meter

[SeaPhD at aol.com]

I am in the early stages of assessing the feasibility of adapting a new 
portable acoustic doppler flow velocity meter to a version that can be used 
by divers.  I have been relating some of my reef research experiences to the 
factory engineers, but I would like to have feedback from other researchers 
who might have additional opinions.  In my opinion, there is a need for 
better portable instrumentation for flow measurements, and the manufacturer 
of this instrument seems to be interested in working with scientists. 

I suppose that the best thing to do would be to give some of the capabilities 
of the present instrument, which is presently used while wading.   

     The meter presently has...  
              a 7.6 m cable 
              a telescoping (0.5 m to 1.8 m) wading rod for the sensor 
              an ultrasonic doppler sensor (38 mm x 38 mm x 25 mm) 
              a receiving unit/digital display (11.4 cm x 17.8 cm x 15.2 cm) 
              a rechargeable battery for up to 12 hours of continuous use  
              a velocity range of 0.015 to + or - 3 m/s (bidirectional) 
              a velocity resolution of 0.003 m/s 
              minimum particulate level of 100 micron @ 100 ppm 
              overall weight (minus the carrying case) 1.4 kg 

I would appreciate any comments on the suitability of the size, weight, 
measurement capabilities, etc. to underwater use by a diver.  I would also be 
interested in what people consider to be a reasonable cost for such an 
instrument.  The wading model will sell for about $3500 (US), but the diving 
model could differ considerably, depending on demand and features.  Please 
feel free to e-mail comments to me directly, or, if you are aware of a 
similar instrument, I would like to know about it. 

                                                   Thanks, 

                                                   Randy, J. Runnels (e-mail: 
 SeaPhD at aol.com) 
                                                   Marine Education & 
Research Specialties, Inc. 
                                                   P.O. Box 10517 
                                                   Tampa, Florida  33679-0517 

                                                   Phone (813)254-5970