ASTM E3022-15
Standard Practice for Measurement of Emission Characteristics and Requirements for LED UV-A Lamps Used in Fluorescent Penetrant and Magnetic Particle Testing

Standard No.

ASTM E3022-15

Release Date

2015

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E3022-18

Latest

ASTM E3022-18

Scope

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.

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).

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ASTM E3022-15 Referenced Document

• ANSI/ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories
• ANSI/NCSL Z540.3 Requirements for the Calibration of Measuring and Test Equipment
• ASTM E1208 Standard Test Method for Fluorescent Liquid Penetrant Examination Using the Lipophilic Post-Emulsification Process
• ASTM E1209 Standard Test Method for Fluorescent Liquid Penetrant Examination Using the Water-Washable Process
• ASTM E1210 Standard Test Method for Fluorescent Liquid Penetrant Examination Using the Hydrophilic Post-Emulsification Process
• ASTM E1219 Standard Test Method for Fluorescent Liquid Penetrant Examination Using the Solvent-Removable Process
• ASTM E1316 Standard Terminology for Nondestructive Examinations
• ASTM E1348 Standard Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry
• ASTM E1417/E1417M Standard Practice for Liquid Penetrant Testing
• ASTM E1444 Standard Practice for Magnetic Particle Examination
• ASTM E165/E165M Standard Practice for Liquid Penetrant Testing for General Industry
• ASTM E2297 Standard Guide for Use of UV-A and Visible Light Sources and Meters used in the Liquid Penetrant and Magnetic Particle Methods
• ASTM E709 Standard Guide for Magnetic Particle Examination

ASTM E3022-15 history

• 2018 ASTM E3022-18 Standard Practice for Measurement of Emission Characteristics and Requirements for LED UV-A Lamps Used in Fluorescent Penetrant and Magnetic Particle Testing
• 2015 ASTM E3022-15 Standard Practice for Measurement of Emission Characteristics and Requirements for LED UV-A Lamps Used in Fluorescent Penetrant and Magnetic Particle Testing