An Improved Strain Gauge Transducer Amplifier for Wind Tunnel Use,

Abstract

An AC excited self-balancing instrument for measuring low level strain gauge transducer outputs is described. The design of a specific circuit optimised for use with a small wind tunnel force balances is presented with sufficient information to facilitate circuit optimisation for other applications. The instrument is intended for applications where the bridge output voltage is below the level that can be conveniently handled by conventional DC amplifier systems. Tests on a prototype instrument showed an input noise in a 0 .1 Hz t 0.7 Hz bandwith of 4 nV RMS, a zero drift of less than 0.1 microV per day and negligible sensitivity drifts. Keywords. Strain, Measuring, Instruments, Amplifiers, Wind tunnels, Strain gages.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1986
Accession Number
ADA181641

Entities

People

  • N. Pollock

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Computer Programs
  • Department Of Defense
  • Electrical Equipment
  • Engineering
  • Fluid Mechanics
  • Gages
  • Load Cells
  • Measurement
  • Measuring Instruments
  • Mechanical Engineering
  • Phase Shift
  • Resistance
  • Strain Gages
  • Transducers
  • United States
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Electronics Engineering
  • Fluid Dynamics.
  • Systems Analysis and Design