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STN EN 61391-2



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Označenie: STN EN 61391-2
Slovenský názov: Ultrazvuk. Impulzné echoskenery. Časť 2: Meranie maximálnej hĺbky prieniku a lokálneho dynamického rozsahu
Anglický názov:
Pôvodné označenie:
Dátum vydania: 1. 11. 2010
Dátum zrušenia:
Jazyk: EN
ICS: 17.140.50
Triediaci znak: 35 6893
Úroveň zapracovania: idt IEC 61391-2:2010, idt EN 61391-2:2010
Vestník: 10/10
Poplatok: Tlačená verzia: 18,90 € 


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Obsah normy STN EN 61391-2
FOREWORD..........................................................................................................................4
INTRODUCTION....................................................................................................................6
1 Scope..............................................................................................................................8
2 Normative references .......................................................................................................8
3 Terms and definitions .......................................................................................................8
4 General requirement.......................................................................................................13
5 Environmental conditions................................................................................................13
6 Equipment and data required..........................................................................................14
6.1 General .................................................................................................................14
6.2 Phantoms ..............................................................................................................14
6.2.1 Phantoms required ....................................................................................14
6.2.2 Phantom for maximum depth of penetration...............................................14
6.2.3 Phantoms to estimate local dynamic range ................................................15
6.3 Test equipment for measuring local dynamic range ...............................................15
6.4 Digitized image data..............................................................................................17
7 Measurement methods ...................................................................................................19
7.1 System sensitivity: maximum depth of penetration.................................................19
7.1.1 Scanning system settings ..........................................................................19
7.1.2 Image acquisition ......................................................................................19
7.1.3 Analysis.....................................................................................................20
7.2 Local dynamic range .............................................................................................22
7.2.1 Scanning system settings ..........................................................................22
7.2.2 Measurement method ................................................................................22
7.2.3 Type II testing for measuring local dynamic range .....................................23
7.2.4 Estimating local dynamic range using backscatter contrast ........................24
Annex A (informative) Phantom for determining maximum depth of penetration ...................26
Annex B (informative) Local dynamic range using acoustical test objects............................. 28
Bibliography.........................................................................................................................35
Figure 1 – Arrangement for measuring local dynamic range using an acoustic-signal
injection technique................................................................................................................16
Figure 2 – Arrangement for measuring local dynamic range using an acousticallycoupled
burst generator ........................................................................................................17
Figure 3 – Image of the penetration phantom ........................................................................20
Figure 4 – Mean digitized image data value vs. depth for the phantom image data
(A(j)) and for the noise image data (A'(j)) ..............................................................................21
Figure 5 – Digitized-image data vs. attenuator setting during local dynamic range
measurements using acoustic signal injection.......................................................................23
Figure 6 – Image of phantom with inclusions (circles) ...........................................................24
Figure 7 – Ensemble-average mean pixel value vs. backscatter contrast of inclusions. .........25
Figure A.1 – Phantom for maximum depth of penetration tests..............................................26
Figure B.1 – Possible arrangement of reflectors for determining local dynamic range ...........29
Figure B.2 – Displayed intensity (or image pixel value) vs. reflector reflection
coefficient .............................................................................................................................30
Figure B.3 – Flat ended wire test object for determining local dynamic range........................32
Figure B.4 – The experimentally observed backscattering cross section of flat-ended
stainless-steel wires as a function of diameter for three frequencies: .. 9.6 MHz; :
4.8 MHz; ..: 2.4 MHz [33] .....................................................................................................33