IEC 62127-2:2007/AMD1:2013

IEC 62127-2 ®
Edition 1.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Ultrasonics – Hydrophones –
Part 2: Calibration for ultrasonic fields up to 40 MHz

Ultrasons – Hydrophones –
Partie 2: Etalonnage des champs ultrasoniques jusqu’à 40 MHz

IEC 62127-2:2007/A1:2013
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IEC 62127-2 ®
Edition 1.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Ultrasonics – Hydrophones –
Part 2: Calibration for ultrasonic fields up to 40 MHz

Ultrasons – Hydrophones –
Partie 2: Etalonnage des champs ultrasoniques jusqu’à 40 MHz

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 11.040.50 ISBN 978-2-83220-616-4

– 2 – 62127-2 Amend.1 © IEC:2013
FOREWORD
This amendment has been prepared by IEC technical committee 87: Ultrasonics.
The text of this amendment is based on the following documents:
FDIS Report on voting
87/519/FDIS 87/527/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
Replace throughout the document:
“non-linear” by “nonlinear”,
This replacement applies to the English text only.
Replace throughout the document:
“non-linearity” by “nonlinearity”
This replacement applies to the English text only.
Replace throughout the document:
“non-linearities” by “nonlinearities”
This replacement applies to the English text only.
Replace throughout the document:
“non-linearly” by “nonlinearly”
This replacement applies to the English text only.
2 Normative references
Replace the references to IEC 60050-801:1994, IEC 61161:2006, IEC 61828:2006 and
IEC 62127-1, by the following new references:
IEC 60050-801, International Electrotechnical Vocabulary – Chapter 801: Acoustics and
electroacoustics
IEC 61161, Ultrasonics – Power measurement – Radiation force balances and performance
requirements
IEC 61828, Ultrasonics – Focusing transducers – Definitions and measurement methods for
the transmitted fields
62127-2 Amend.1 © IEC:2013 – 3 –
IEC 62127-1:2007, Ultrasonics - Hydrophones - Part 1: Measurement and characterization of
medical ultrasonic fields up to 40 MHz
Amendment 1:2013
3 Terms, definitions and symbols
3.9
effective radius of a non-focused ultrasonic transducer
Replace the term by effective radius of a non-focusing ultrasonic transducer

Replace the term in the Note by effective radius of a non-focusing ultrasonic transducer

3.14
external transducer aperture
Replace, in Note 1, "Figure 2" by "Figure 1".

3.15
far field
Replace the existing text of the definition (not including Note 1 and Note 2) by the following:
region of the field where z>z aligned along the beam axis for planar non-focusing transducers.
T
Add the following new Note 3:
NOTE 3 If the shape of the transducer aperture produces several transition distances, the one furthest from the
transducer shall be used.
[SOURCE: IEC 62127-1:2007/Amendment 1:2013, definition 3.28]

3.23
instantaneous intensity
Replace the existing text of Note 1 by the following:
NOTE 1 Instantaneous intensity is the product of instantaneous acoustic pressure and particle velocity. It is
difficult to measure intensity in the ultrasound frequency range. For the measurement purposes referred to in this
International Standard and under conditions of sufficient distance from the external transducer aperture (at least
one transducer diameter, or an equivalent transducer dimension in the case of a non-circular transducer) the
instantaneous intensity can be approximated by the derived instantaneous intensity.
Replace the existing text of Note 2 by the following:
Instantaneous intensity is expressed in watts per square metre (W/m )

Add the following new definitions:
3.26
derived instantaneous intensity
approximation of the instantaneous intensity
For the measurement purposes referred to in this International Standard, and under
conditions of sufficient distance from the transducer (at least one transducer diameter, or an
equivalent transducer dimension in the case of a non-circular transducer) the derived
instantaneous intensity is determined by

– 4 – 62127-2 Amend.1 © IEC:2013
p(t)
(1)
I(t) =
ρ c
where:
p(t) is the instantaneous acoustic pressure;
ρ is the density of the medium;
c is the speed of sound in the medium.
NOTE 1 For measurement purposes referred to in this International Standard, the derived instantaneous
intensity is an approximation of the instantaneous intensity.
NOTE 2 Increased uncertainty should be taken into account for measurements very close to the transducer.
NOTE 3 Derived instantaneous intensity is expressed in watts per square metre (W/m ).
[SOURCE: IEC 62127-1:2007/ Amendment 1:2013, definition 3.78]

3.27
effective wavelength
λ
longitudinal speed of sound in the propagation medium divided by the arithmetic-mean
working frequency
NOTE Effective wavelength is expressed in metres (m).
[SOURCE:IEC 61828:2001, definition 4.2.24].

3.28
longitudinal plane
plane defined by the beam axis and a specified orthogonal axis
NOTE See Figure 1 in IEC 62127-1.
[SOURCE: IEC 62127-1:2007, definition 3.35].

3.29
source aperture plane
closest possible measurement plane to the external transducer aperture, that is
perpendicular to the beam axis
[SOURCE:IEC 61828:2001, definition 4.2.67].

3.30
source aperture width
L
SA
in a specified longitudinal plane, the greatest –20 dB beamwidth along the line of
intersection between the designated longitudinal plane and the source aperture plane
NOTE 1 See Figure 2 in IEC 61828 2001.
NOTE 2 Source aperture width is expressed in metres (m).
[SOURCE:IEC 61828, definition 4.2.68].

62127-2 Amend.1 © IEC:2013 – 5 –
3.31
transducer aperture width
L
TA
full width of the transducer aperture along a specified axis orthogonal to the beam axis of the
unsteered beam at the centre of the transducer
NOTE 1 See Figure 4 in IEC 62127-1 .
NOTE 2 Transducer aperture width is expressed in metres (m).
[SOURCE:IEC 62127-1:2007/ Amendment 1:2013, definition 3.87].

3.32
transition distance
z
T
for a given longitudinal plane, the transition distance is defined based on the transducer
design (when known) or from measurement:
a) from design: the transition distance is the equivalent area of the ultrasonic
transducer aperture width divided by π times the effective wavelength, λ;
b) for measurements, the transition distance is the equivalent area of the source
aperture width divided by π times the effective wavelength.
NOTE 1 Using method a), an unapodized ultrasonic transducer with circular symmetry about the beam axis, the
2 2
equivalent area is πa , where a is the radius. Therefore the transition distance is z = a /λ. For the first example
T
of a square ultrasonic transducer, the equivalent area is (L ) , where L is the transducer aperture width in
TA TA
the longitudinal plane. Therefore, the transition distance for both orthogonal longitudinal planes containing the
sides or transducer aperture widths, is z = (L ) /(πλ). For the second example, for a rectangular ultrasonic
T TA
transducer with transducer aperture widths L and L , the equivalent area for the first linear transducer
TA1 TA2
aperture width for the purpose of calculating the transition distance for the associated longitudinal plane is
(L ) , where L is the transducer aperture width in this longitudinal plane. Therefore, the transition
TA1 TA1
distance for this plane is z = (L ) /(πλ). For the orthogonal longitudinal plane that contains the other
T1 TA1
transducer aperture width, L , the equivalent area for the other for the purpose of calculating the transition
TA2
distance for the associated longitudinal plane is (L ) , where L is the transducer aperture width in this
TA2 TA2
longitudinal plane. Therefore, the transition distance for this plane is z = (L ) /(πλ).
T2 TA2
NOTE 2 Using method b) for measurements in a longitudinal plane, the source aperture width, L , in the same
SA
plane is used in z = (L ) /(πλ).
T SA
NOTE 3 Transition distance is expressed in metre (m).
[SOURCE IEC 61828:2001, definition 4.2.75, modified: There is significant difference in the
layout of the definition]
4 List of symbols
Replace:
a effective radius of a non-focused ultrasonic transducer
t
by
a effective radius of a non-focusing ultrasonic transducer
t
Add the following new symbols:
L transducer aperture width
TA
L source aperture width
SA
z transition distance
T
– 6 – 62127-2 Amend.1 © IEC:2013
5 Overview of calibration procedures
5.3 Reporting of results
Add, after the sixth bullet point ("in situations where the mounting arrangement…") the
following new Note 5 and renumber existing Notes 5 and 6 accordingly:
NOTE 5 Care should be taken in designing the hydrophone mount at low frequencies (below 200 kHz) where the
acoustic wavelengths are sufficiently large that the use of long-bursts may lead to the direct acoustic signal being
contaminated by reflections from the mount. The importance of the effect may be investigated through varying the
burst length and observing the influence of reflections on the hydrophone signal. Acoustic absorbers may be
useful in suppressing these reflections. Hydrophone sensitivity may also be affected by the way
...