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CLC/TS 61949:2008

Current
Current

The latest, up-to-date edition.

Ultrasonics - Field characterization - In situ exposure estimation in finite-amplitude ultrasonic beams
Published date

18-07-2008

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 List of symbols
5 Equipment required
6 Test methods
  6.1 Establishing quasi-linear conditions
      6.1.1 The local distortion parameter
      6.1.2 Upper limit for quasi-linear conditions for sigma[q]
      6.1.3 Range of applicability for quasi-linear conditions
  6.2 Measurement procedure for estimated in situ exposure
      6.2.1 Identification of quasi-linear conditions
      6.2.2 Tables of limiting mean peak acoustic pressure
      6.2.3 Measurement of acoustic quantities under quasi-linear
            conditions
      6.2.4 Measurement of the scaling factor
      6.2.5 Calculation of attenuated acoustic quantities
  6.3 Uncertainties
Annex A (informative) Review of evidence
Annex B (informative) Review of alternative methods for managing
        finite-amplitude effects during field measurement
Annex C (informative) Parameters to quantify nonlinearity
Annex D (informative) Tables of upper limits for mean peak
        acoustic pressure for quasi-linear conditions
Bibliography

This Technical Specification describes means to allow "attenuated" acoustic quantities to be calculated under conditions where the associated acoustic measurements, made in water using standard procedures, may be accompanied by significant finite-amplitude effects.This Technical Specification establishes:- the general concept of the limits of applicability of acoustic measurements in water resulting from finite-amplitude acoustic effects;- a method to ensure that measurements are made under quasi-linear conditions in order to minimise finite-amplitude effects;- the definition of an acoustic quantity appropriate for establishing quasi-linear conditions;- a threshold value for the acoustic quantity as an upper limit for quasi-linear conditions;- a method for the estimation of attenuated acoustic quantities under conditions of nonlinear propagation in water.

Committee
CLC/SR 87
DocumentType
Technical Specification
PublisherName
European Committee for Standards - Electrical
Status
Current

Standards Relationship
IEC TS 61949:2007 Identical
DIN CLC/TS 61949 : 2010 Identical
NEN NPR IEC CLC/TS 61949 : 2008 Identical
VDE V 0754-2 : 2010 Identical
CEI CLC/TS 61949 : 2011 Identical
S.R. CLC/TS 61949:2008 Identical

CEI EN 60601-2-62 : 2016 MEDICAL ELECTRICAL EQUIPMENT - PART 2-62: PARTICULAR REQUIREMENTS FOR THE BASIC SAFETY AND ESSENTIAL PERFORMANCE OF HIGH INTENSITY THERAPEUTIC ULTRASOUND (HITU) EQUIPMENT
I.S. EN 60601-2-62:2015 MEDICAL ELECTRICAL EQUIPMENT - PART 2-62: PARTICULAR REQUIREMENTS FOR THE BASIC SAFETY AND ESSENTIAL PERFORMANCE OF HIGH INTENSITY THERAPEUTIC ULTRASOUND (HITU) EQUIPMENT
BS EN 60601-2-62:2015 Medical electrical equipment Particular requirements for the basic safety and essential performance of high intensity therapeutic ultrasound (HITU) equipment
EN 60601-2-62:2015 Medical electrical equipment - Part 2-62: Particular requirements for the basic safety and essential performance of high intensity therapeutic ultrasound (HITU) equipment

IEC 62127-1:2007+AMD1:2013 CSV Ultrasonics - Hydrophones - Part 1: Measurement and characterizationof medical ultrasonic fields up to 40 MHz
IEC 60601-2-37:2007+AMD1:2015 CSV Medical electrical equipment - Part 2-37: Particular requirements for the basic safety and essential performance of ultrasonic medical diagnostic and monitoring equipment
IEC 61161:2013 Ultrasonics - Power measurement - Radiation force balances and performance requirements
IEC 61828:2001 Ultrasonics - Focusing transducers - Definitions and measurement methods for the transmitted fields
EN 61161:2013 Ultrasonics - Power measurement - Radiation force balances and performance requirements
IEC 62359:2010+AMD1:2017 CSV Ultrasonics - Field characterization - Test methods for the determination of thermal and mechanical indices related to medical diagnostic ultrasonic fields
EN 62127-1:2007/A1:2013 ULTRASONICS - HYDROPHONES - PART 1: MEASUREMENT AND CHARACTERIZATION OF MEDICAL ULTRASONIC FIELDS UP TO 40 MHZ (IEC 62127-1:2007/A1:2013)

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