IEC 62127-1:2007/COR1:2008

IEC 62127-1
(First edition – 2007)
Ultrasonics – Hydrophones –
Part 1: Measurement and characterization of

medical ultrasonic fields up to 40 MHz

CORRIGENDUM 1
Page 9
3 Terms, definitions and symbols
3.37
near field
On page 17, instead of:
NOTE For circular planar transducers, this is at a distance less than A /πλ , where A is the output beam area
1 1
group and λ is the wavelength of the ultrasound corresponding to the acoustic frequency.
read:
NOTE For circular planar transducers, this is at a distance less than A /πλ, where A is the output beam area
ob ob
and λ is the wavelength of the ultrasound corresponding to the acoustic frequency.
3.38
non-linear propagation parameter
Instead of:
1/ 2
1/ 2
()()
ln F − l + F
ωβl
g g
σ = p
m m
3 1/ 2
ρ c ()F − l
g
read:
1/ 2
1/2
ln(()F − 1 +F )
ωβ l
g g
σ = p
m m
3 1/ 2
ρ c ()F − 1
g
3.44
peak-rarefactional acoustic pressure
On page 19, instead of:
p (or p )
r
read:
p (or p )
• r
August 2008
3.76
ultrasonic transducer element group dimensions

On page 24, delete Notes 2 and 3.

Page 24
4 List of symbols
Instead of:
F 0,69* A /(–6 dB beam area)
g g
v(f) instantaneous particle velocity
non-linear propagation parameter
σm
read:
F 0,69 · A /(–6 dB beam area)
g g
v instantaneous particle velocity
σ non-linear propagation parameter
m
Page 28
5.1.7 Bandwith
5.1.7.1 Narrow-band approximation
Instead of:
M (f )
L
where M (f ) = 20log
L,dB
M
read:
M (f )
L
where M (f ) = 20log dB
L,dB 10
M
5.1.8 Linearity
Instead of:
“The upper limit of known linear dynamic range shall be stated…”
read:
“The upper limit of known dynamic range shall be stated…”
August 2008
Page 30
5.2.2 Positioning systems
5.2.2.2 Hydrophone positioning

Instead of:
“ …so that the normal to the direction of maximum sensitivity…”

read:
“…such that the direction of maximum sensitivity…”

Page 32
5.4 Recommendations for ultrasonic equipment being characterized
Number the notes as Note 1 and Note 2.
Page 35
7.2 Primary pressure parameters
7.2.3 Spatial-peak rms acoustic pressure
Instead of:
NOTE 1 Particular regions of interest are those areas where on the beam axis maxima or minima of any of these
pressures occur.
read:
NOTE 1 Particular regions of interest are those areas where on the beam axis maxima or minima of this pressure
occur.
7.2.6 Intensity parameters using pulse-pressure-squared integral
7.2.6.1 Pulse duration
On page 38, instead of:
t
a
V ( t ) dt = 0,1 and (12)
ppsi
∫
=0
M t
t
b
V ( t ) dt = 0,9 (13)
ppsi
∫
=0
M t
read:
t
a
U ( t ) dt = 0,1 ppsiand (12)
2∫
=0
t
M 1
t
b
U ( t ) dt = 0,9 ppsi (13)
2∫
=0
t
M 1
August 2008
Instead of:
V(t) is the measured output voltage of the hydrophone.

read:
U(t) is the measured output voltage of the hydrophone.

7.2.6.2 Spatial-peak pulse-average intensity

Instead of:
“…the acoustic impedance of distilled water…”

read:
“…the characteristic acoustic impedance of distilled water…”
7.2.6.3 Spatial-peak temporal-average intensity
In the first paragraph, instead of:
“For the non-auto-scanning mode…”
read:
“For the non-scanning mode…”
In the second paragraph, instead of:
“For an auto-scanning beam (e.g. automatic B-mode)…”
read:
“For a scanning
...