Report

Standards for Radiation Thermometry Frank Liebmann NCSLi 2012 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 2 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 3 Learning Objectives • Gain knowledge of the published standards available pertaining to radiation thermometry and infrared thermometry. • Apply published standards to measurement, calibration, and testing involving radiation thermometry and infrared thermometry. 7/31/12 Liebmann - NCSL 4 Introduction • Historically a lack of standards • Past 5 years, an increase of standards 7/31/12 Sources Topics Accuracy Levels • • • • • • • • • Industrial • Standards Laboratory • NMI BIPM IEC ASTM VDI/VDE Usage Calibration Testing Uncertainty calculation Liebmann - NCSL 5 IEC IEC 62492-1 ASTM E1256 ASTM E2758 ASTM E2847 VDI 3511 Part 4 ● VDI 3511 Part 4.2 ● VDI 3511 Part 4.3 VDI 3511 Part 4.4 ● MSL TG22 ● EMA Technical Guide… Radiation Thermometer Calibration ● ● ● ● Industrial CCT-WG508-03 High-end BIPM NMI Standard Test Methods Body Uncertainties Calibration Usage Overview of Standards ● ○ ○ ● ● ○ ● ● ○ ○ ● ○ ● ○ ● ○ ○ ● ○ ○ ● ○ ○ ● ○ ○ ● ● ○ ● ● ● ● ● ○ ● ● Full applicability ○ Partial applicability 7/31/12 Liebmann - NCSL 6 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 7 BIPM • CCT-WG508-03, “Uncertainty budgets for calibration of radiation thermometers below the silver point” • Scope is limited to radiation thermometers with readout in radiance and not temperature • Useful for other types of work Blackbody Calibration temperature ** Impurities * Plateau identification * Blackbody emissivity, isothermal Blackbody emissivity, nonisothermal ** Reflected ambient radiation Cavity bottom heat exchange Convection ** Cavity bottom uniformity ** Ambient conditions ** Radiation Thermometer Size-of-source effect Non-linearity Reference temperature Ambient temperature Atmospheric absorption Gain ratios Noise Calibration Equation and Use Interpolation error Drift Unknown temperature * Fixed point blackbody only ** Variable temperature blackbody only 7/31/12 Liebmann - NCSL 8 BIPM – Sakuma-Hattori S T 7/31/12 C c2 exp 1 AT B Liebmann - NCSL 9 BIPM – Other Standards • CCT/03-03, “Uncertainty budgets for realization of scales by radiation thermometry” • Covers work done above the silver-point (961.78 °C) • Fixed-points as blackbody sources 7/31/12 Liebmann - NCSL 10 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 11 IEC 62492-1 “Industrial process control devices - Radiation thermometers - Part 1: Technical data for radiation thermometers” • Terms, definitions and abbreviations for radiation thermometry • How to state technical data based on these terms all related to radiation thermometry ● Measuring temperature range ● Measurement uncertainty (accuracy) ● Noise equivalent temperature difference ● Measuring distance ● Field-of-view ● Distance ratio ● Size-of-source effect 7/31/12 ● Emissivity setting ● Spectral range ● Influence of the internal instrument or ambient temperature (temperature parameter) ● Influence of air humidity (humidity parameter) ● Long-term stability ● Short-term stability Liebmann - NCSL ● Repeatability ● Interchangeability ● Response time ● Exposure time ● Warm-up time ● Operating temperature range and air humidity range ● Storage and transport temperature range and air humidity range 12 IEC Work Items • Part 2 – Specifications – Being drafted • Part 3 – Test Methods – Not yet started 7/31/12 Liebmann - NCSL 13 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 14 ASTM Committee E20 • Committee E20 on Temperature Measurement • Subcommittees Designation E20.02 E20.03 E20.04 E20.05 E20.06 E20.07 E20.09 E20.90 E20.91 E20.94 7/31/12 Title Radiation Thermometry Resistance Thermometers Thermocouples Liquid-in-Glass Thermometers and Hydrometers New Thermometers and Techniques Fundamentals in Thermometry Digital Contact Thermometers Executive Editorial and Terminology Publication Liebmann - NCSL 15 E20.02 Roadmap • 2008 – Get handheld IR thermometer users to make more accurate measurements – Usage (E2758) – Calibration (E2847) • Currently – RT Classification – Emissivity Standard – RT Manual 7/31/12 Liebmann - NCSL 16 ASTM E20.02 Standards • E1256-11a: Standard Test Methods for Radiation Thermometers (Single Waveband Type) • E2758-10: Standard Guide for Selection and Use of Wideband, Low Temperature Infrared Thermometers • E2847-11: Standard Practice for Calibration and Accuracy Verification of Wideband Infrared Thermometers 7/31/12 Liebmann - NCSL 17 ASTM E1256 Standard Test Methods for Radiation Thermometers (Single Waveband Type) • Calibration Accuracy Test Method • Repeatability Test Method • Field-of-View Test Method (Target Size Test Method) • Response Time Test Method • Warm-Up Time Test Method • Long-Term Stability Test Method (Long-Term Drift Test Method) 7/31/12 Liebmann - NCSL 18 ASTM E2758 Standard Guide for Selection and Use of Wideband, Low Temperature Infrared Thermometers • Basic usage of infrared thermometers • Information on issues that may arise when using infrared thermometry • Test methods to determine – Emissivity – Transmissivity – Reflected temperature • Graphical summary of equations for infrared thermometry • Mathematical methods to determine the error caused by emissivity miscalculation, reflected temperature miscalculation, and atmospheric effects • The mathematical methods use the Sakuma-Hattori Equation • Contain worked examples 7/31/12 Liebmann - NCSL 19 ASTM E2847 Standard Practice for Calibration and Accuracy Verification of Wideband Infrared Thermometers • Comparison of an “infrared thermometer to the radiance temperature of a radiation source” – Cavity blackbody sources – Flat-plate sources • Equipment – – – – – – • • • • Thermal Radiation Source Aperture * Transfer Standard Ambient Temperature Thermometer Distance Measuring Device Purge * Two traceability schemes Preparation of Equipment Calibration Procedure Uncertainties 7/31/12 Liebmann - NCSL 20 E2847 7/31/12 Liebmann - NCSL 21 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 22 VDI/VDE Verein Deutscher Ingenieure (VDI) and Verband der Elektrotechnik, Elektronik und Informationstechnik (VDE) VDI/VDE 3511 Blatt 4 Technische Temperaturmessung Strahlungsthermometrie (VDI/VDE 3511 Part 4 Temperature measurement in industry – Radiation thermometry) • 4 Documents covering radiation thermometry – Part 4, discusses basic theoretical and practical considerations concerning radiation thermometry – Part 4.2 contains the “Maintenance of the specification for radiation thermometers” – Part 4.3 is entitled “Standard test methods for radiation thermometers with one wavelength range” – Part 4.4 is entitled, “Calibration of radiation thermometers” 7/31/12 Liebmann - NCSL 23 VDI/VDE VDI/VDE 3511 Part 4.3 Measuring Temperature Range Measurement uncertainty (accuracy) Influence of the internal instrument temperature Long-term stability Repeatability Noise equivalent temperature difference Spectral range Target/target size Response time Exposure time Operating ambient temperature Storage temperature range ASTM E1256 Calibration Accuracy Long-Term Stability Repeatability Field-of-view Response Time Warm-Up Time 7/31/12 Liebmann - NCSL 24 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 25 MSL TG22 “MSL Technical Guide 22, Calibration of Low-Temperature Infrared Thermometers”. • Geared towards handheld infrared thermometers • How infrared thermometers measure temperature • Discusses influences on infrared thermometer measurement including introduction of a measurement equation • How the signal is processed and about measurement errors • Calibration and calibration sources including the concepts of calibrating the source by contact thermometry or by radiation thermometry • Method to determine detector temperature for an infrared thermometer. 7/31/12 Liebmann - NCSL 26 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 27 Entidad Mexicana de Acreditación Guía Técnica Sobre Trazabilidad e Incertidumbre en la Calibración de Termómetros de Radiación Technical Guide on Traceability and Uncertainty for Radiation Thermometer Calibration • Purely in Spanish • Traceability • Uncertainty • Calibration schemes for calibration equipment • Good practice for radiation thermometry metrology 7/31/12 Liebmann - NCSL 28 Overview • • • • • • • • • • Learning Objectives Introduction Overview of Standards BIPM IEC ASTM VDI/VDE MSL EMA Concluding Remarks 7/31/12 Liebmann - NCSL 29 IEC IEC 62492-1 ASTM E1256 ASTM E2758 ASTM E2847 VDI 3511 Part 4 ● VDI 3511 Part 4.2 ● VDI 3511 Part 4.3 VDI 3511 Part 4.4 ● MSL TG22 ● EMA Technical Guide… Radiation Thermometer Calibration ● ● ● ● Industrial CCT-WG508-03 High-end BIPM NMI Standard Test Methods Body Uncertainties Calibration Usage Concluding Remarks ● ○ ○ ● ● ○ ● ● ○ ○ ● ○ ● ○ ● ○ ○ ● ○ ○ ● ○ ○ ● ○ ○ ● ● ○ ● ● ● ● ● ○ ● ● Full applicability ○ Partial applicability 7/31/12 Liebmann - NCSL 30 Questions 7/31/12 Liebmann - NCSL 31