ISO 20998-2:2022-08

Measurement and characterization of particles by acoustic methods - Part 2: Linear theory

German title: Partikelgrößenbestimmung durch akustische Verfahren - Teil 2: Leitlinien für die lineare Theorie
Publication date: 2022-08
Original language: English
Pages: 33

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Content

Content (en)

Foreword
Introduction
Scope
Normative references
Terms and definitions
Symbols and abbreviations
Mechanism of attenuation (dilute case)
- Introduction
- Excess attenuation coefficient
- Specific attenuation mechanisms
  - Scattering
  - Thermal losses
  - Viscoinertial losses
  - Non-monotonic relaxation mechanisms
- Linear models
  - Review
  - Physical parameters
Determination of particle size
- Introduction
- Inversion approaches used to determine PSD
  - Optimization of a PSD function
  - Regularization
- Limits of application
Instrument qualification
- Calibration
- Precision
  - Reference samples
  - Repeatability
  - Reproducibility
- Accuracy
  - Qualification procedure
  - Reference samples
  - Instrument preparation
  - Accuracy test
  - Qualification acceptance criteria
Reporting of results
Viscoinertial loss model (informative)
ECAH theory and limitations (informative)
- Introduction
- Calculation of attenuation
- Limitations of ECAH theory
- Explicit expressions for simplified ECAH theory including thermal attenuation
Example of a semi-empirical model (informative)
Iterative fitting (informative)
Physical parameter values for selected materials (informative)
Practical example of PSD measurement (informative)
- Purpose
- Attenuation spectrum
- Choice of model
- PSD model
- Inversion
- Results
Bibliography

ICS

19.120

Replacement amendments

This document replaces ISO 20998-2:2013-08 .

Cooperation at DIN

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