ASTM E1862-14(2022) PDF

Overview

ASTM E1862-14(2022), Standard Practice for Measuring and Compensating for Reflected Temperature Using Infrared Imaging Radiometers, provides essential procedures to accurately measure surface temperature with infrared imaging radiometers by addressing errors caused by reflected infrared energy. Infrared thermographers often face challenges where reflections from surrounding environments can skew temperature readings. This standard outlines two validated methods - the Reflector Method and the Direct Method - for identifying and compensating for these thermal reflection error sources, ensuring more reliable infrared temperature measurements in both laboratory and field conditions.

Key Topics

• Reflected Temperature Compensation: The standard details procedures to identify and adjust for the impact of reflected infrared energy, which can otherwise cause significant temperature measurement errors.
• Measurement Methods:
  • Reflector Method: Utilizes a high-reflectance material placed to mimic the specimen's reflective properties, allowing accurate measurement of reflected temperature.
  • Direct Method: Measures reflected temperature directly by positioning the infrared radiometer at specific angles relative to the specimen surface.
• Use with Infrared Radiometers: The procedures are compatible with any infrared imaging radiometer equipped with necessary computer features, including emissivity controls and temperature compensation settings.
• Precision and Repeatability: While the repeatability and reproducibility of these procedures may vary due to specimen characteristics, precision can be inferred through replicate measurements.
• Safety Considerations: Users are responsible for following all relevant safety, health, and environmental protocols, especially when working near energized or heated equipment.
• Applicability: Methods are suitable for a variety of application environments using commonly available materials.

Applications

The practices outlined in ASTM E1862-14(2022) are critical in industries and scenarios where accurate infrared temperature measurement is vital, including:

• Industrial Plant Maintenance: Ensure reliable thermal imaging for condition monitoring and predictive maintenance of machinery and electrical systems.
• Building Inspections: Identify moisture, insulation defects, or energy loss by compensating for reflections off interior and exterior surfaces.
• Research Laboratories: Achieve precise thermographic data in controlled tests involving reflective surfaces or complex environments.
• Nondestructive Testing (NDT): Enhance reliability of temperature-based inspection techniques across metals, composites, and other materials.
• Energy Audits and HVAC Assessments: Obtain accurate surface temperature readings in energy efficiency evaluations.

Proper implementation of this standard minimizes error and enhances the value of infrared thermography in nondestructive testing, preventive maintenance, and other technical applications.

Related Standards

• ASTM E1316 - Terminology for Nondestructive Examinations: Provides key definitions used throughout ASTM’s nondestructive testing standards, including terms relevant to infrared thermography.
• Additional relevant ASTM standards for nondestructive testing, thermography, and radiometry, accessible via the ASTM website.

Keywords

infrared imaging, reflected temperature, infrared radiometer, thermography, temperature measurement, compensation, nondestructive testing, ASTM E1862, infrared examination, radiometry, energy reflection, emissivity, field measurement