^TRACKING 

 IpiNGER 



Fig. 11.5 Ambient light meter, dissolved oxygen sensor, current meter and other equipment atward DEEP QUEST. 



Light flux: 0.225-9,000 picowatts/cm='. 



d. Light Transmission: 



Operation: A coUimated light beam of 

 known intensity is passed through a baffled 

 tube. At 1-meter water distance the residual 

 light is monitored by a photocell. The output 

 of this photocell is dependent on the amount 

 of light transmitted through the 1-meter 



path of seawater and is a measure of water 

 clarity (or turbidity). 



Data: (Hydro Products Model) The taut 

 band meter in the readout unit displays the 

 water clarity in terms of percent of transmis- 

 sion. 



Alpha Range: 0.1 to 2.2 In/m ±3% at mid- 

 range. 



547 



