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Author(s): | T. Cobine |
Reviewer(s): | H. Barnes, T. Gorgas |
Management Approval: | D.J. Houpt (Supervisor of Analytical Systems) |
Audience: | Scientists, Marine Laboratory Specialists |
Origination date: | 1/17/09 |
Current version: | V2.0 |
Revised: | V2.1 |
Domain: | Physics |
System: | P-Wave Analysis |
User Guide Contents
| Table of Contents | ||
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Introduction
The velocity logger measures ultrasonic sound speed in materials placed between its transducers in the x, y, and z-directions on working-half split core sections or discrete sample cubes (Figure 1). Minicores are measured in the x-direction, and cubes can be measured on any axis. Velocity data generated from these sensors are part of the physical properties suite of shipboard sample measurements.
For split core sections, velocity is measured in the x-direction using a caliper velocimeter and in the y- and z-directions using pairs of piezoelectric transducers. The laser measures the position of the top of the sample, and using this along with the offset to the transducers, calculates the position of the measurement in the sample (recorded as Offset in LIMS).
The caliper velocimeter measures velocity on discrete cubes in all three directions with no offset recorded.
Figure 1. Section Half Measurement Directions.
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