1、INTERNATIONALSTANDARDIEC61685First edition2001-07Ultrasonics Flow measurement systems Flow test objectUltrasons Systmes de mesure de dbit Montage pour essai de dbitReference numberIEC 61685:2001(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPP
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8、 Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONALSTANDARDIEC61685First edition2001-07Ultrasonics Flow measurement systems Flow test objectUltrasons Systmes de mesure de dbit Montage pour essai de dbitPRICE CODE IEC 2001 Copyright-all rights
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11、)CONTENTSFOREWORD.4INTRODUCTION.51Scope.62Normative references.63Definitions.64List of symbols.115General outline of flow Doppler test object.126Specification of the flow Doppler test object.126.1General.126.2Blood-mimicking fluid(BMF).136.3Tube.146.4Tissue-mimicking material(TMM).156.5Geometry.157P
12、recautions to prevent changes in the composition of the blood-mimicking fluid(BMF).158Specifications for labelling.16Annex A(informative)Rationale concerning the position of this standard.17Annex B(normative)Formulae relating various quantities.20Annex C(informative)Rationale for the numerical value
13、s chosen in this standard.21Annex D(informative)Description of an example flow Doppler test object.23Annex E(informative)Schematic diagram of a possible flow circuit.32Annex F(informative)Measuring methods.33Bibliography.34Figure 1 Three configurations for Doppler flow test objects.12Figure D.1 The
14、main elements of a flow test object.24Figure D.2 Backscattering coefficient of BMF as a function of frequency.26Figure D.3 Attenuation of TMM(?)and BMF(?)as a function of frequency.26Figure D.4 Attenuation of ultrasound by material of tube wall,as a function offrequency.27Figure D.5 Deformation of v
15、elocity spectrum of parabolic flow by attenuation due totube wall(wall thickness 1,5 mm).28Figure D.6 Backscattering coefficient of two samples of TMM as a function offrequency.29Figure D.7 The quotient of attenuation by TMM(1-way passage)and frequency as afunction of frequency.29Figure D.8 Testing
16、for penetration depth.31Figure E.1 Schematic diagram of a possible flow circuit,showing the place of the flowDoppler test object.32LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.61685 IEC:2001(E)3 Table 1 Typical ranges of parameters for blood at 37 C,where f is the acoustic-working frequency in hertz.13Table 2 Specification of blood-mimicking fluid(BMF).13Table 3 Parameters of tissue-mimicking material(TMM).15Table A.1 Parameters