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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Hi, I am trying to make a phased-array reference block for a specific application. 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.
Typical of a practical application, E states in A2. Very interesting topic, I look forward to read your point of view, or from others too. Marc and myself have been discussing about the ACG recently, so he forwarded this topic to me. Instrument characteristics measured in accordance with this guide are expressed in terms that relate to their potential usefulness for ultrasonic examinations.
Let me know if you have a suggestion for better wording and I can prepare the 2e491 changes to the document. 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.
Let me know what you think! All or portions of the guide may be used as determined by the user. This could be 16mm for a long soudpath in a wedge over the range you indicated! Regards Ed Start Original Message Historical Version s – view previous versions of standard. Active view current version of f2491. Instrument characteristics measured in accordance with this guide are expressed in terms aatm relate to their potential usefulness for ultrasonic examinations. This standard does not purport to address all of the safety e2419, if any, associated with its use.
There are many reasons NOT to use this range, not the least of which there is a large component s2491 the beam that is near the first r2491 angle. Other electronic instrument characteristics in phased-array units are similar to non-phased-array units and may be measured as described in E or E 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.
In fact I do not think that this function even compensates for a fixed depth SDH. Instead, this would be better addressed using a radius to ensure a constant area reflecting surface. The compensation is typically performed electronically at multiple depths.
Using a Side Drilled Hole may not even be the best option. E gives guidance on evaluating performance of phased-array systems. Most codes do not use focusing for general weld inspection. I went through ASTM E and the discussions in the forum but I found nothing on the surface roughness of phased-array blocks.
Similarly, at the upper end of your range the divergence is causing a large portion of signal to mode convert to Rayleigh!
Perhaps surface finish of a block merits a new thread. But there are far too many variables for the manufacturer of probes and instruments to try to look after these limitations and xstm the end the verification of suitability is had by looking at the results on targets like those suggested in E Where acceptance criteria 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.
Re: Question about ASTM E
It is not intended to define performance and acceptance criteria, but rather to provide data from which such criteria may be established. It is to note that it is the same for delay calibration from a radius with a single probe asfm. Link to Active This link will always route to the current Active version of the standard. I believe that you both are on the right track, asttm I would have something to add. Now the main point I want to bring to your attention is that the exit point moves from a phased-array probe.
Or maybe the definition implicitly includes the TCG because the two can’t live together when doing S-scan calibration. Some combinations may tolerate a bit more range and others astj but is generally pushing thing past the limit in all cases.
Is it a possibility to still use the radius and move the probe for each angle? I measured amplitudes from 1.
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.
No other units of measurement are included in this standard. As I understand, ACG is used to compensate the attenuation due to beam steering. In fact you are still generating some compression mode at this angle.
ASTM E2491 TYPE B PHASED ARRAY ASSESSMENT BLOCK, 1018 STEEL
This guide is not intended to be used as a substitute for calibration or standardization of an instrument or system to inspect any given material. Any clarification will be appreciated! The compensation is typically performed electronically at multiple angles. Just because the software can be used to enter a range of angles is perhaps misleading. Note that there are technical limits to ACG, that is, beyond asm certain angular range, compensation is not possible.
Finally, not to show things worst than they are. I provided this definition from a list of 2e491 Array definitions that had been assembled with input from a variety of manufacturers and users. The wording in this definition does not seem to reflect the true intent of the function. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Other electronic instrument characteristics in phased-array units are similar to non-phased-array units and may be measured as described in Guide E or E