A DIGITAL AMPLITUDE AND PHASE MEASURING SYSTEM (DAPHNE)
Abstract
A transportable automatic measuring and recording system has been designed and constructed for experiments concerned with oscillatory derivative measurements in wind tunnels. A wattmeter method is used to resolve the input signals in the frequency range 0.05 c/s to 1 kc/s into in-phase and quadrature components referred to the drive or other reference, and accurate measurement of frequency is made by an electronic counter. Results of these measurements together with reference data are automatically read out and printed. A punched- paper tape record is also produced for computation by a digital computer. This Report describes the equipment in a general manner and discusses some of the factors affecting accuracy. The system is adaptable for other work involving the measurement of the relative phases and amplitudes of a number of signals.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1964
- Accession Number
- AD0465879
Entities
People
- H. C. Leedham
Organizations
- Royal Aircraft Establishment