This standard is issued under the fixed designation E; the number 1 This guide is under the jurisdiction of ASTM Committee E07 on Nondestruc-. Originally contact ASTM Customer Service at [email protected] For Annual Book of ASTM approved in Last previous edition approved in as E Buy ASTM E Standard Guide for Evaluating Performance Characteristics of Phased-Array Ultrasonic Examination Instruments and Systems from SAI.
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This means that if you try to calibrate from a single position, the beam will hit the radius penpendicularly at only one angle and the effect is going to be worst at higher and lower angles.
Any clarification will be appreciated! I measured amplitudes from 1. Now the main point I want to bring to your attention is that the exit point moves from a phased-array probe. Similarly, at the upper end of your range the divergence is causing a large portion of signal to mode convert to Rayleigh! f2491
ASTM E TYPE B PHASED ARRAY ASSESSMENT BLOCK, STEEL – NDT
I have noticed the same thing that Marc did when I calibrated using a side-drilled hole at constant depth, so I turned to the radius. Hi, I am trying to make a w2491 reference block for a specific application.
The compensation is typically performed electronically at multiple angles. There is also a concern for focusing. E gives guidance on evaluating performance of phased-array systems. It is intended for phased-array flaw detection instruments operating in the nominal frequency range of 1 MHz to 20 MHz, but the procedures are applicable to measurements on instruments utilizing significantly higher frequency components.
Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Re: Question about ASTM E
I provided this definition from asttm list of Phased Array definitions that had been assembled with input from a variety of manufacturers and users. You will end up with a distorted S-scan. But this too focusing will have a significant effect on the ability to calibrate for a consistent sensitivity over a range of angles the more you focus theless you are likely to maintain sensitivity with steering.
Ginzel, hello Marc, Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me.
It is as you stated, to compensate for the effect of steering which is effectively for echo-transmittance loss with increasing angle to some extent there is the added compensation for the slight change in wedge-path. Typical of a practical application, E states in A2. Most codes do not use focusing for general weld inspection.
ASTM E2491 TYPE B PHASED ARRAY ASSESSMENT BLOCK, 1018 STEEL
I went through ASTM E and the discussions in the forum but I found nothing on the surface roughness of phased-array blocks. The compensation zstm typically performed electronically at multiple depths.
I would please like to know if there is any restrictions on the surface roughness of a reference block for phased-array application. Note that there are technical limits to ACG, that is, beyond a certain angular range, compensation is not possible.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Some combinations may tolerate a bit more range and others less but is generally pushing thing past the limit in all cases. Instrument characteristics measured in accordance with this guide are expressed in terms that relate to their potential usefulness for ultrasonic examinations. Where acceptance asttm are implied herein they are for example only and are subject to more or less restrictive limits imposed by customers and end users controlling documents.
I personally would have said something like: The diagrams in E are examples of how target patterns can be arranged to carry out some of the assessments. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Let me know if you have a suggestion for better wording and I can prepare the necesary changes to the document.
Regards Ed Start Original Message It is not intended to define performance and acceptance criteria, but rather to provide data from which such criteria may be established. Instead, this would be better addressed using a radius to ensure a constant area reflecting surface. It is to note that it is the same for delay calibration from a radius with a single probe position. Historical Version s – view previous versions of standard.