IEC 62127-1:2007/AMD1:2013
(Amendment)Amendment 1 - Ultrasonics - Hydrophones - Part 1: Measurement and characterization of medical ultrasonic fields up to 40 MHz
Amendment 1 - Ultrasonics - Hydrophones - Part 1: Measurement and characterization of medical ultrasonic fields up to 40 MHz
Amendement 1 - Ultrasonics - Hydrophones - Part 1: Mesurage et caractérisation des champs ultrasoniques médicaux jusqu'à 40 MHz
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IEC 62127-1 ®
Edition 1.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Ultrasonics – Hydrophones –
Part 1: Measurement and characterization of medical ultrasonic fields up to
40 MHz
Ultrasons – Hydrophones –
Partie 1: Mesurage et caractérisation des champs ultrasoniques médicaux
jusqu'à 40 MHz
IEC 62127-1:2007/A1:2013
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IEC 62127-1 ®
Edition 1.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Ultrasonics – Hydrophones –
Part 1: Measurement and characterization of medical ultrasonic fields up to
40 MHz
Ultrasons – Hydrophones –
Partie 1: Mesurage et caractérisation des champs ultrasoniques médicaux
jusqu'à 40 MHz
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX Q
ICS 11.040.50 ISBN 978-2-83220-599-0
– 2 – 62127-1 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
87/518/FDIS 87/524/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• withdrawn,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.
INTRODUCTION
Delete, in the second paragraph, the term “piezoelectric”.
Delete, in the second paragraph, the last two sentences.
1 Scope
Delete, in Note 2, the second sentence.
2 Normative references
Replace the reference to the ISO Guide to the expression of uncertainty in measurement as
follows:
62127-1 Amend.1 © IEC:2013 – 3 –
ISO/IEC Guide 98-3, Uncertainty of measurement – Part 3: Guide to the expression of
uncertainty in measurement (GUM:1995)
3 Terms, definitions and symbols
Replace, throughout this clause, the phrase “watts per metre squared” by “watts per square
metre” (9 times).
Replace, throughout this clause, the phrase “metres squared” by “square metres” (3 times).
3.1
acoustic pulse waveform
Delete Note 2.
3.3
acoustic frequency
acoustic-working frequency
Replace, in the second sentence of Note 1," 3.3.1 and 3.3.2" by "3.3.1, 3.3.2, 3.3.3 and
3.3.4".
3.3.1
zero-crossing acoustic-working frequency
f
awf
Replace the existing text of the definition by the following:
number, n, of consecutive half-cycles (irrespective of polarity) divided by twice the time
between the commencement of the first half-cycle and the end of the n-th half-cycle
NOTE 1 None of the n consecutive half-cycles should show evidence of phase change.
NOTE 2 The measurement should be performed at terminals in the receiver that are as close as possible to the
receiving transducer (hydrophone) and, in all cases, before rectification.
NOTE 3 This frequency is determined according to the procedure specified in IEC/TR 60854.
NOTE 4 This frequency is intended for continuous-wave systems only.
3.3.2
arithmetic-mean acoustic-working frequency
f
awf
Add the following note to the definition:
NOTE 3 If f is not found within the range < 3f , f is to be understood as the lowest frequency above this range
2 1 2
at which the spectrum magnitude is 3 dB below the peak magnitude.
3.3.3
peak pulse acoustic frequency
Delete the full stop after the symbol f .
p
3.4
azimuth axis
Figure 1 – Schematic diagram of the different planes and lines in an ultrasonic field
In the figure, replace “Y” by “Z” and “Z” by “Y”.
In the key of the figure, replace “Y beam axis” by “Y elevation axis” and “Z elevation axis” by
“Z beam axis”.
– 4 – 62127-1 Amend.1 © IEC:2013
3.7
beam area
Replace the symbol by: “A , A ”
b,6 b,20
Replace the existing text of Note 1 by the following:
NOTE 1 If the position of the plane is not specified, it is the plane passing through the point corresponding to the
maximum value of the pulse-pressure-squared integral in the whole acoustic field.
Replace, in Note 3, the word “levels” by “fractions”.
3.22
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
3.28
far field
Replace the existing text by the following:
region of the field where z > z aligned along the beam axis for planar non-focusing
T
transducers
NOTE 1 In the far field, the sound pressure appears to be spherically divergent from a point on or near the
radiating surface. Hence the pressure produced by the sound source is approximately inversely proportional to the
distance from the source.
NOTE 2 The term “far field” is used in this International Standard only in connection with non-focusing source
transducers. For focusing transducers a different terminology for the various parts of the transmitted field applies
(see IEC 61828).
NOTE 3 If the shape of the transducer aperture produces several transition distances, the one furthest from the
transducer is used.
3.34
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.
3.37
near field
Replace the existing definition and note by the following:
region of the field where z < z aligned along the beam axis for planar non-focusing
T
transducers
NOTE 1 For circular planar transducers, this is at a distance less than A /πλ, where A is the output beam
ob ob
area and λ is the wavelength of the ultrasound corresponding to the acoustic frequency.
NOTE 2 If the shape of the transducer aperture produces several transition distances, the one closest to the
transducer shall be used.
62127-1 Amend.1 © IEC:2013 – 5 –
3.38
non-linear propagation parameter
Replace the existing term, symbol and definition by the following:
local distortion parameter
σ
q
index which permits the prediction of nonlinear distortion of ultrasound for a specific
ultrasonic transducer, and is given by σ from:
q
2πf β 1
awf
(2)
σ = z p
q m
ρ⋅c F
a
where:
z is the axial distance of the point of interest to the transducer face;
p is the mean-peak acoustic pressure at the point in the acoustic field corresponding to
m
the spatial-peak temporal-peak acoustic pressure;
β is the nonlinearity parameter ( β = 1 + B/2A = 3,5 for pure water at 20 °C );
f is the acoustic-working frequency;
awf
F is the local area factor .
a
[SOURCE: IEC/TS 61949:2007, definition 3.12, modified – the text of the definition has
changed substantially, the equation however is unchanged.]
3.43
peak acoustic pressure
Replace the existing symbol by: “p (or p ) or p (or p )”.
r - c +
3.44
peak-rarefactional acoustic pressure
Replace the existing symbol by: “p (or p )”
r -
3.45
peak-compressional acoustic pressure
Replace symbol by: “p (or p )”
c +
3.47
pulse-average intensity
I
pa
Replace, in the definition, the word “ratio” by “quotient”.
Add the following new note and number the existing note as Note 2.:
NOTE 1 This definition applies to pulses and bursts.
3.51
pulse repetition period
Delete, in Note 1, the second sentence ("See also IEC 60469-1:1987, 5.3.2.1.").
3.52
pulse repetition rate
Delete Note 1.
Renumber Note 2 as Note.
– 6 – 62127-1 Amend.1 © IEC:2013
3.65
temporal-average intensity
Replace the existing Note 1 by the following:
NOTE 1 The time-average should be taken over an integral number of acoustic repetition periods.
Add the following new Note 2 and renumber the existing Note 2 as Note 3:
NOTE 2 (Relating to ultrasonic medical diagnostic systems) in principle, the temporal-average intensity is an
average over a relatively long time interval. For non-auto-scanning systems, the instantaneous intensity should
be averaged over one or more pulse repetition periods. For auto-scanning systems, the instantaneous
intensity should be averaged over one or more scan repetition periods for a specified operating mode.
3.76
ultrasonic transducer element group dimensions
Replace, in the definition, the term “ultrasonic transducer element group” by “ultrasonic
transducer element group” (bold font for the entire term).
Add the following new definitions:
3.78
derived instantaneous intensity
quotient of squared instantaneous acoustic pressure and characteristic acoustic impedance
of the medium at a particular instant in time at a particular point in an acoustic field
p(t)
I(t) = (1)
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
...
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