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Position: Chinese Standard in English/GB/T 18694-2002
GB/T 18694-2002   Non-destructive testing - Ultrasonic inspection - Characterization of search unit and sound field (English Version)
Standard No.: GB/T 18694-2002 Status:valid remind me the status change

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Standard No.: GB/T 18694-2002
English Name: Non-destructive testing - Ultrasonic inspection - Characterization of search unit and sound field
Chinese Name: 无损检测 超声检验 探头及其声场的表征
Chinese Classification: J04    Basic standards and general methods
Professional Classification: GB    National Standard
Issued by: AQSIQ
Issued on: 2002-3-10
Implemented on: 2002-8-1
Status: valid
Language: English
File Format: PDF
Word Count: 5000 words
Price(USD): 120.0
Delivery: via email in 1 business day
This Standard establishes procedures for specifying certain ultrasonic search unit characteristics and for measuring the associated sound field. The aim is to establish uniformity of testing techniques, to form a basis for the interpretation of results obtained by different laboratories and at different times. Note that this Standard establishes no acceptance criteria; however, it does establish the technical basis for criteria that may be defined by user parties. The search units discussed herein are straight-beam and angle-beam search units with a nominal ultrasonic frequency from 0.5 MHz to 15 MHz. Surface wave search units are not included in this Standard. This Standard provides procedures for specifying sound field parameters as well as methods of measurement in immersion tests. This Standard does not address sound field measurement in contact tests. This Standard describes measurement procedures for evaluating characteristics of ultrasonic search units and describes techniques used for obtaining sound field data produced by electrically pulse-excited search units used in the field or in the laboratory. The characteristic parameters discussed in this Standard are the upper, lower and centre frequencies, the wavelength, the bandwidth, the time domain and frequency domain responses, the near-field length, the half-angle of beam spread for search units of different shapes in free field, echo sound measurements, beam profiles, the impedance and the relative sensitivity. Formats for specifying both flat-face and focused search units are given. To provide baseline information and to check possible performance degradation, the electrical properties of the search unit are measured independently of the ultrasonic instrument. The electrical impedance and sensitivity are measured at specific frequencies selected for each search unit. The electrical impedance corresponds to the complex input impedance of the search unit and the sensitivity of the search unit is a measure of the electroacoustic efficiency of the unit. These procedures are described in 4.6 and 4.7, respectively.
Foreword II Foreword of ISO III Introduction IV 1 Scope 1 2 Normative References 2 3 Symbols 2 4 Techniques and Procedures 3 4.1 Test set-up 4 4.2 Time domain response 7 4.3 Frequency response 7 4.4 Free-field parameters 9 4.5 Echo sound measurement 13 4.6 Impedance 15 4.7 Relative sensitivity 15 Appendix A (Normative) Reference Block 18
Referred in GB/T 18694-2002:
* JB/T 4730-1994
* JB/T 8428-1996
* JB/T 10063-1999
GB/T 18694-2002 is referred in:
* GB/T 4162-2008 Forged and Rolled Steel Bars — Method for Ultrasonic Testing
* GB/T 18852-2002 Ultrasonic non-destructive testing - Reference blocks and test procedures for the characterization of contact search unit beam profiles
* GB/T 6402-2008 Steel Forgings—Method for Ultrasonic Testing
* GB/T 7233.1-2009 Steel castings—Ultrasonic examination—Part 1:Steel castings for general purposes
* GB/T 7233.1-2009 Steel castings—Ultrasonic examination—Part 1:Steel castings for general purposes
* GB/T 6402-2008 Steel Forgings—Method for Ultrasonic Testing
* GB/T 4162-2008 Forged and Rolled Steel Bars — Method for Ultrasonic Testing
* GB/T 6402-2008 Steel Forgings—Method for Ultrasonic Testing
* GB/T 4162-2008 Forged and Rolled Steel Bars — Method for Ultrasonic Testing
* GB/T 6402-2008 Steel Forgings—Method for Ultrasonic Testing
* GB/T 7233.2-2010 Steel castings - Ultrasonic examination - Part 2: Steel castings for highly stressed components
*GB/T 4162-2022 Method for ultrasonic testing of forged and rolled steel bars
*GB/T 6519-2024 Ultrasonic inspection of wrought aluminium and magnesium alloy products
Code of China
Standard
GB/T 18694-2002  Non-destructive testing - Ultrasonic inspection - Characterization of search unit and sound field (English Version)
Standard No.GB/T 18694-2002
Statusvalid
LanguageEnglish
File FormatPDF
Word Count5000 words
Price(USD)120.0
Implemented on2002-8-1
Deliveryvia email in 1 business day
Detail of GB/T 18694-2002
Standard No.
GB/T 18694-2002
English Name
Non-destructive testing - Ultrasonic inspection - Characterization of search unit and sound field
Chinese Name
无损检测 超声检验 探头及其声场的表征
Chinese Classification
J04
Professional Classification
GB
ICS Classification
Issued by
AQSIQ
Issued on
2002-3-10
Implemented on
2002-8-1
Status
valid
Superseded by
Superseded on
Abolished on
Superseding
Language
English
File Format
PDF
Word Count
5000 words
Price(USD)
120.0
Keywords
GB/T 18694-2002, GB 18694-2002, GBT 18694-2002, GB/T18694-2002, GB/T 18694, GB/T18694, GB18694-2002, GB 18694, GB18694, GBT18694-2002, GBT 18694, GBT18694
Introduction of GB/T 18694-2002
This Standard establishes procedures for specifying certain ultrasonic search unit characteristics and for measuring the associated sound field. The aim is to establish uniformity of testing techniques, to form a basis for the interpretation of results obtained by different laboratories and at different times. Note that this Standard establishes no acceptance criteria; however, it does establish the technical basis for criteria that may be defined by user parties. The search units discussed herein are straight-beam and angle-beam search units with a nominal ultrasonic frequency from 0.5 MHz to 15 MHz. Surface wave search units are not included in this Standard. This Standard provides procedures for specifying sound field parameters as well as methods of measurement in immersion tests. This Standard does not address sound field measurement in contact tests. This Standard describes measurement procedures for evaluating characteristics of ultrasonic search units and describes techniques used for obtaining sound field data produced by electrically pulse-excited search units used in the field or in the laboratory. The characteristic parameters discussed in this Standard are the upper, lower and centre frequencies, the wavelength, the bandwidth, the time domain and frequency domain responses, the near-field length, the half-angle of beam spread for search units of different shapes in free field, echo sound measurements, beam profiles, the impedance and the relative sensitivity. Formats for specifying both flat-face and focused search units are given. To provide baseline information and to check possible performance degradation, the electrical properties of the search unit are measured independently of the ultrasonic instrument. The electrical impedance and sensitivity are measured at specific frequencies selected for each search unit. The electrical impedance corresponds to the complex input impedance of the search unit and the sensitivity of the search unit is a measure of the electroacoustic efficiency of the unit. These procedures are described in 4.6 and 4.7, respectively.
Contents of GB/T 18694-2002
Foreword II Foreword of ISO III Introduction IV 1 Scope 1 2 Normative References 2 3 Symbols 2 4 Techniques and Procedures 3 4.1 Test set-up 4 4.2 Time domain response 7 4.3 Frequency response 7 4.4 Free-field parameters 9 4.5 Echo sound measurement 13 4.6 Impedance 15 4.7 Relative sensitivity 15 Appendix A (Normative) Reference Block 18
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