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ASTM-E2491:2008 Edition

ASTM-E2491:2008 Edition

$44.96

E2491-08 Standard Guide for Evaluating Performance Characteristics of Phased-Array Ultrasonic Testing Instruments and Systems

Published By Publication Date Number of Pages
ASTM 2008 18
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1.1 This guide describes procedures for evaluating some performance characteristics of phased-array ultrasonic examination instruments and systems.

1.2 Evaluation of these characteristics is intended to be used for comparing instruments and systems or, by periodic repetition, for detecting long-term changes in the characteristics of a given instrument or system that may be indicative of impending failure, and which, if beyond certain limits, will require corrective maintenance. Instrument characteristics measured in accordance with this guide are expressed in terms that relate to their potential usefulness for ultrasonic examinations. Other electronic instrument characteristics in phased-array units are similar to non-phased-array units and may be measured as described in E 1065 or E 1324 .

1.3 Ultrasonic examination systems using pulsed-wave trains and A-scan presentation (rf or video) may be evaluated.

1.4 This guide establishes no performance limits for examination systems; if such acceptance criteria are required, these must be specified by the using parties. Where acceptance criteria are implied herein they are for example only and are subject to more or less restrictive limits imposed by customer s and end user s controlling documents.

1.5 The specific parameters to be evaluated, conditions and frequency of test, and report data required, must also be determined by the user.

1.6 This guide may be used for the evaluation of a complete examination system, including search unit, instrument, interconnections, scanner fixtures and connected alarm and auxiliary devices, primarily in cases where such a system is used repetitively without change or substitution. 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.

1.7 Required test apparatus includes selected test blocks and position encoders in addition to the instrument or system to be evaluated.

1.8 Precautions relating to the applicability of the procedures and interpretation of the results are included.

1.9 Alternate procedures, such as examples described in this document, or others, may only be used with customer approval.

1.10 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.11 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 Summary of Guide
Significance and Use
3 Procedure
Keywords
A1. DETERMINATION OF PHASED-ARRAY BEAM PROFILE
A1.1 Introduction
A1.2 Test Setup
4 FIG. A1.1
FIG. A1.2
5 FIG. A1.3
FIG. A1.4
FIG. A1.5
6 A2. DETERMINATION OF PHASED-ARRAY BEAM STEERING LIMITS
A2.1 Introduction
A2.2
FIG. A1.6
7 FIG. A2.1
FIG. A2.2
8 A2.3
A3. DETERMINATION OF PHASED-ARRAY ELEMENT ACTIVITY
A3.1 Introduction
A3.2 Test Set-Up
TABLE A3.1
10 A4. ASSESSMENT OF PHASED-ARRAY FOCUSING ABILITY
A4.1 Introduction
A4.2 Test Set-Up
FIG. A3.1
11 A5. ASSESSMENT OF PHASED-ARRAY COMPUTER CONTROL OF PARAMETERS AND DATA DISPLAY
A5.1 Introduction
A5.2 Test Set-Up
FIG. A4.1
12 A6. ASSESSMENT OF PHASED-ARRAY WEDGE ATTENUATION AND DELAY COMPENSATIONS
A6.1 Introduction
A6.2 Wedge-attenuation Compensation
A6.3 Wedge-delay Compensation
13 FIG. A6.1
14 FIG. A6.2
15 A7. ASSESSMENT OF PHASED-ARRAY INSTRUMENT LINEARITIES
A7.1 Introduction
A7.2 Test Set-Up
A7.3 Display Height Linearity
A7.4 Amplitude Control Linearity
FIG. A7.1
16 FIG. A7.2
FIG. A7.3
17 TABLE A7.1
FIG. A7.4
18 A7.5 Time-Base Linearity (Horizontal Linearity)

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