Sweep-synchronized positionable trigger and supplementary components

This report describes the Sweep-Synchronized Positionable Trigger, together with its functions and supplementary components, as designed and built for use with the Precision Graphic Recorder (PGR) at the Woods Hole Oceanographic Institution. The positionable trigger provides a means for plotting a variable on the PGR record as a function of time, for triggering equipment such as oscilloscopes at any time, for displaying ship's heading, and for supplying, semi-automatically, ocean depth to a ship- board computer.The Office of Naval Research under Contract Nonr- 40 29(00

Acoustic and oceanographic observations and configuration information for the WHOI moorings from the SW06 experiment

This document describes data, sensors, and other useful information pertaining to the moorings that were deployed from the R/V Knorr from July 24th to August 4th, 2006 in support of the SW06 experiment. The SW06 experiment was a large, multi-disciplinary effort performed 100 miles east of the New Jersey coast. A total of 62 acoustic and oceanographic moorings were deployed and recovered. The moorings were deployed in a “T” geometry to create an along-shelf path along the 80 meter isobath and an across-shelf path starting at 600 meters depth and going shoreward to a depth of 60 meters. A cluster of moorings was placed at the intersection of the two paths to create a dense sensor-populated area to measure a 3-dimensional physical oceanography. Environmental moorings were deployed along both along-shelf and across-shelf paths to measure the physical oceanography along those paths. Moorings with acoustic sources were placed at the outer ends of the “T” to propagate various signals along these paths. Five single hydrophone receivers were positioned on the across shelf path and a vertical and horizontal hydrophone array was positioned at the intersection of the “T” to get receptions from all the acoustics assets that were used during SW06.Funding was provided by the Office of Naval Research under Contract No. N00014-04-1014

Instruction manual for Precision Graphic Recorder (PGR)

This manual describes the objectives, design, operation, and maintenance of the Precision Graphic Recorder (PGR), emphasizing its application to echo-sounding. The words "precision graphic recording" describe a method for displaying data by means of successive, precisely-timed rectilinear sweeps of a recording point or "stylus" across a long, moving strip of sensitized paper (Veatch and Smith, 1939, p. 61-63). The recorded data appear as dye-markings, shaded in proportion to signal amplitude along the sweep of the moving recording point.The Bureau of Ships Under Contract NObsr-72521 and Office of Naval Research Under Contract Nonr-1367 (00) (NR-261-102

Ping-through-the-hull 3.5 kHz echo-sounding systems on the research vessels CHAIN, ATLANTIS II, and KNORR

This report documents the 3.5. kHz sounding systems currently in use on Woods Hole research vessels. To help others to install similar facilities, we discuss the history, installation technique, performance and calibrations of our various systems.Prepared for the 0ffice of Naval Research under Contract N00014-74-C-0262; NR 083-004