Page 265 - The ROV Manual - A User Guide for Remotely Operated Vehicles 2nd edition

254 CHAPTER 10 Video
NMOS BSDSDB
PMOS
G
G
p+ n+ n+ p+ p+ n+ n-well
P-substrate
FIGURE 10.4
Schematic of CMOS element.
FIGURE 10.5
Small pinhole camera.
The traditional vacuum tube video camera has given way to the solid-state CCD. Likewise, the SIT camera has been the traditional low-light camera in the subsea industry until the late 1980s. The latest high-sensitivity CCDs of the electron multiplication type now have the sensitivity of the early SIT cameras—and the CCD is much more cost effective—therefore, SIT cameras have gone out of vogue in the subsea industry.
In subsea camera systems, the typical camera uses a standard industry capture device enclosed in a pressure housing wired with wet-mate connectors to provide the total deepwater camera sys- tem. Examples are provided in Figures 10.5 and 10.6.
10.2.2 Lens optics
The lens is a light-gathering device that collects and then refracts incoming light to project a certain quality/quantity of that light onto a light-gathering device for processing. There are several types of lenses depending upon their shape and light-gathering characteristics (Figure 10.7).
(Courtesy VideoRay.)