Accession Number:

AD0419191

Title:

TIME-FREQUENCY SIGNATURES THROUGH OPTICAL DIFFRACTION SCANNING

Descriptive Note:

Corporate Author:

MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY

Personal Author(s):

• Jackson, Philip L.

Report Date:

1963-09-01

Pagination or Media Count:

30.0

Abstract:

An optical scanning method has been developed to present frequency content as it occurs and changes throughout a variable-density seismogram. Energy distributions are shown in both frequency and time. A two-dimensional pattern is presented which can be visually evaluated, and is suitable for numerical measurement. The report describes and discusses the method, and gives illustrative examples. It also describes a similar scanning method by which seismic wave dispersions can be revealed and measured.

Descriptors:

• *EARTHQUAKES
• *OPTICAL SCANNING
• OPTICAL EQUIPMENT
• LIGHT
• EXPLOSIONS
• DIFFRACTION
• SEISMIC WAVES
• RECORDING SYSTEMS
• MEASUREMENT
• FREQUENCY
• TIME

Subject Categories:

• Seismology
• Optical Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE