A Convenient Recording System for a Roberts Current Meter
Abstract
This recording system permits rapid and continuous interpretation of current velocities and their fluctuations in time by an instrument. 'in-situ', which measures and transmits the data to a laboratory ship, or to shore. The system utilizes the time interval between contact closures made by the Roberts meter every so many revolutions of its impeller. These time intervals, the ordinates, are presented versus time, the abscissa, on a chart recorder. The envelope of the time intervals gives a rapid visual picture of the situation. Long-and short-period variations of the velocity can be seen at a glance, but above all the system permits the immediate recognition of the response of a shipborne meter to the ship's movements, including yaw, roll, and pitch. The electronics for the system are simple, economical, and obviate the time- consuming data processing heretofore necessary. The recorder can be calibrated in the field by means of a stop watch.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1960
- Accession Number
- ADA068782
Entities
People
- Irving Weisman
- Roberto Frassetto
- Rolf Anderson
Organizations
- Columbia University