An Improved Iowa Sediment Concentration Analyzer,

Abstract

The Iowa Sediment Concentration Measuring System (ISCMS) is an electro-optical instrument designed for measuring suspended sediment concentrations in situ. The instrument employs a small light source and sensor which responds to particles interrupting the light from the sensor. The improved model has a higher carrier frequency to eliminate the influence of particle velocity on mean measurements and to improve the high-frequency response of the system. This change in carrier frequency required that 11 circuits be redesigned. A particle generator, consisting of small partially drilled holes in a rotating disk, was used to evaluate instrument performance. The results of tests conducted with this generator showed that mean concentration measurements for particle velocities as high as 7.3 m/s were unaffected by particle velocity. Also, the -3-db upper frequency limit occurs at a particle velocity greater than 3.7 m/s. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1977
Accession Number
ADA049175

Entities

People

  • John R. Glover

Organizations

  • University of Iowa

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Analyzers
  • Automatic Gain Control
  • Calibration
  • Carrier Frequencies
  • Detectors
  • Electronic Circuits
  • Field Effect Transistors
  • Frequency Response
  • Generators
  • High Pass Filters
  • Light Sources
  • Low Pass Filters
  • Measurement
  • Optical Instruments
  • Sine Waves
  • Suspended Sediments
  • Transistors

Readers

  • Aerosol Science/Aerosol Physics
  • Electrical Engineering
  • Space/Atmospheric Physics.