ASTM E3022-15
(Practice)Standard Practice for Measurement of Emission Characteristics and Requirements for LED UV-A Lamps Used in Fluorescent Penetrant and Magnetic Particle Testing
Standard Practice for Measurement of Emission Characteristics and Requirements for LED UV-A Lamps Used in Fluorescent Penetrant and Magnetic Particle Testing
SIGNIFICANCE AND USE
4.1 UV-A lamps are used in fluorescent penetrant and magnetic particle examination processes to excite fluorophores (dyes or pigments) to maximize the contrast and detection of discontinuities. The fluorescent dyes/pigments absorb energy from the UV-A radiation and re-emit visible light when reverting to its ground state. This excitation energy conversion allows fluorescence to be observed by the human eye.
4.2 The emitted spectra of UV-A lamps can greatly affect the efficiency of dye/pigment fluorescent excitation.
4.3 Some high-intensity UV-A lamps can produce irradiance greater than 10 000 μW/cm2 at 15 in. (381 mm). All high-intensity UV-A light sources can cause fluorescent dye fade and increase exposure of the inspector’s unprotected eyes and skin to high levels of damaging radiation.
4.4 UV-A lamps can emit unwanted visible light and harmful UV radiation if not properly filtered. Visible light contamination above 400 nm can interfere with the inspection process and must be controlled to minimize reflected glare and maximize the contrast of the indication. UV-B and UV-C contamination must also be eliminated to prevent exposure to harmful radiation.
4.5 Pulse Width Modulation (PWM) and Pulse Firing (PF) of UV-A LED circuits are not permitted.
Note 1: The ability of existing UV-A radiometers and spectroradiometers to accurately measure the irradiance of pulse width modulated or pulsed fired LEDs and the effect of pulsed firing on indication detectability is not well understood.
SCOPE
1.1 This practice covers the procedures for testing the performance of ultraviolet A (UV-A), light emitting diode (LED) lamps used in fluorescent penetrant and fluorescent magnetic particle testing (see Guides E709 and E2297, and Practices E165/E165M, E1208, E1209, E1210, E1219, E1417/E1417M and E1444).2 This specification also includes reporting and performance requirements for UV-A LED lamps.
1.2 These tests are intended to be performed only by the manufacturer to certify performance of specific lamp models (housing, filter, diodes, electronic circuit design, optical elements, cooling system, and power supply combination) and also includes limited acceptance tests for individual lamps delivered to the user. This test procedure is not intended to be utilized by the end user.
1.3 This practice is only applicable for UV-A LED lamps used in the examination process. This practice is not applicable to mercury vapor, gas-discharge, arc or luminescent (fluorescent) lamps or light guides (for example, borescope light sources).
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E3022 − 15
Standard Practice for
Measurement of Emission Characteristics and
Requirements for LED UV-A Lamps Used in Fluorescent
1
Penetrant and Magnetic Particle Testing
This standard is issued under the fixed designation E3022; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
1.1 This practice covers the procedures for testing the
bility of regulatory limitations prior to use.
performance of ultraviolet A (UV-A), light emitting diode
(LED) lamps used in fluorescent penetrant and fluorescent
2. Referenced Documents
magnetic particle testing (see Guides E709 and E2297, and
3
2.1 ASTM Standards:
Practices E165/E165M, E1208, E1209, E1210, E1219, E1417/
2
E165/E165M Practice for Liquid Penetrant Examination for
E1417M and E1444). This specification also includes report-
General Industry
ing and performance requirements for UV-A LED lamps.
E709 Guide for Magnetic Particle Testing
1.2 These tests are intended to be performed only by the
E1208 Practice for Fluorescent Liquid Penetrant Testing
manufacturer to certify performance of specific lamp models
Using the Lipophilic Post-Emulsification Process
(housing, filter, diodes, electronic circuit design, optical
E1209 Practice for Fluorescent Liquid Penetrant Testing
elements, cooling system, and power supply combination) and
Using the Water-Washable Process
also includes limited acceptance tests for individual lamps
E1210 Practice for Fluorescent Liquid Penetrant Testing
delivered to the user. This test procedure is not intended to be
Using the Hydrophilic Post-Emulsification Process
utilized by the end user.
E1219 Practice for Fluorescent Liquid Penetrant Testing
1.3 This practice is only applicable for UV-A LED lamps
Using the Solvent-Removable Process
used in the examination process.This practice is not applicable
E1316 Terminology for Nondestructive Examinations
to mercury vapor, gas-discharge, arc or luminescent (fluores-
E1348 Test Method for Transmittance and Color by Spec-
cent) lamps or light guides (for example, borescope light
trophotometry Using Hemispherical Geometry
sources).
E1417/E1417M Practice for Liquid Penetrant Testing
E1444 Practice for Magnetic Particle Testing
1.4 The values stated in inch-pound units are to be regarded
E2297 GuideforUseofUV-AandVisibleLightSourcesand
as standard. The values given in parentheses are mathematical
Meters used in the Liquid Penetrant and Magnetic Particle
conversions to SI units that are provided for information only
Methods
and are not considered standard.
4
2.2 Other Standards:
1.5 This standard does not purport to address all of the
ANSI/ISO/IEC 17025 General Requirements for the Com-
safety concerns, if any, associated with its use. It is the
petence of Testing and Calibration Laboratories
ANSI/NCSL Z540.3 Requirements for the Calibration of
1
Measuring and Test Equipment
This test method is under the jurisdiction of ASTM Committee E07 on
Nondestructive Testing and is the direct responsibility of Subcommittee E07.03 on
Liquid Penetrant and Magnetic Particle Methods.
3. Terminology
Current edition approved Sept. 1, 2015. Published September 2015. DOI:
10.1520/E3022-15 3.1 Definitions—General terms pertaining to ultraviolet A
2
The use of LED lamps for penetrant examination may be covered by a patent.
(UV-A) radiation and visible light used in liquid penetrant and
Interested parties are invited to submit information regarding the identification of
alternative(s) to this patented item to ASTM International Headquarters. Your
comments will receive careful consideration at a meeting of the responsible
3
technical committee, which you may attend. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
NOTE: ASTM International takes no position respecting the validity of any patent contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
rights asserted in connection with any item mentioned in this standard. Users of this Standards volume information, refer to the standard’s Document Summary page on
standard are expressly advised that determination of the validity of any such patent the ASTM website.
4
rights, and the risk of infringement of such rights, are entirely their own Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
responsibility. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.