JJF 1187-2008 PDF English
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Calibration Specification for Thermal Imagers
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JJF 1187-2008: Calibration Specification for Thermal Imagers---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JJF1187-2008
NATIONAL METROLOGICAL TECHNICAL SPECIFICATIONS
Calibration Specification for Thermal Imagers
Issued on. JANUARY 31, 2008
Implemented on. APRIL 30, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine
This Specification was approved by the General Administration of Quality Supervision,
Inspection and Quarantine on January 31, 2008; and should come into effect on April
30, 2008.
Administrative organization.
China Temperature Measurement Technology Committee
Chief drafting organization.
National Institute of Metrology, China
Participating drafting organization.
Guangzhou Sat Electric Infrared Technology Co., Ltd.
This Specification shall be interpreted by China Temperature Measurement
Technology Committee
Calibration Specification
for Thermal Imagers
Chief drafting staffs of this Specification.
Bai Chengyu (National Institute of Metrology, China)
Xing Bo (National Institute of Metrology, China)
Yuan Zundong (National Institute of Metrology, China)
Participating drafting staffs.
Wu Yigang (Guangzhou Sat Electric Infrared Technology Co., Ltd.)
Table of Contents
1 Scope... 5
2 Normative References... 5
3 Terms and Metrological Unit... 5
3.1 Terms... 5
3.2 Metrological unit... 5
4 Overview... 6
5 Metrological Characteristics... 6
5.1 Appearance... 6
5.2 Display... 6
5.3 Error of Indication... 6
5.4 Temperature measurement consistency... 7
6 Calibration Conditions... 7
6.1 Environmental conditions... 7
6.2 Standards and other equipment... 7
7 Calibration Items and Methods... 8
7.1 Calibration items... 8
7.2 Calibration methods... 8
8 Expression of Calibration Results... 12
9 Recalibration Time-Interval... 13
Appendix A Evaluation on the Uncertainty of Indication Error Calibration of
Thermal Imager... 14
Appendix B Recording Format of Calibration Results... 18
Appendix C Data Page Format of Thermal Imager Calibration Certificate... 20
Calibration Specification for Thermal Imagers
1 Scope
This Specification is applicable to the calibration of thermal imagers with temperature
measurement function in the range of -20°C ~ 2000°C.
2 Normative References
This Specification quoted the following references.
JJF 1001-1998 General Terms in Metrology and Their Definitions
JJG 1007-2007 Temperature Metrological Terms and Their Definitions
GB/T 19870-2005 Industrial Inspecting Thermal Imagers
JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement
When using this Specification, pay attention to adopting the current effective editions
of the above normative references.
3 Terms and Metrological Unit
3.1 Terms
3.1.1 The terms and definitions given in GB/T 19870-2005 Industrial Inspecting
Thermal Imagers are applicable to this Specification.
3.1.2 Error of indication
The error of indication for the thermal imager refers to the difference between the
temperature indication of the thermal imager and the agreed true value of the
measured blackbody radiation source temperature.
3.2 Metrological unit
The temperature unit is Celsius (°C) or Kelvin (K).
4 Overview
The thermal imager can convert the thermal radiation on the surface of the object into
a visible image; and correct through emissivity, reflectance and transmittance and
accurately measure the surface temperature and surface temperature distribution of
the object.
5 Metrological Characteristics
5.1 Appearance
5.2 Display
The display of the thermal imager shall be free of defects that affect calibration.
5.3 Error of Indication
The error of indication for temperature of the thermal imager is determined under
calibration laboratory conditions.
5.4 Temperature measurement consistency
The consistency of the temperature measurement results in different areas of the
thermal imager's field of view is the ability of the thermal imager to accurately reflect
the surface temperature distribution of the measured object.
6 Calibration Conditions
6.1 Environmental conditions
6.1.1 The ambient temperature of the calibration laboratory shall be (23±5) °C, while
the humidity shall not be greater than 85% RH (no condensation).
6.2 Standards and other equipment
6.2.1 Standard instrument
Generally, a platinum resistance thermometer, a thermocouple (with corresponding
electrical measuring equipment) or a radiation thermometer is used as a standard
instrument to measure the temperature of the blackbody radiation source.
7 Calibration Items and Methods
7.1 Calibration items
7.1.1 Appearance
The thermal imager's housing, mechanical adjustment parts, exposed optical
components, keys, electrical connections, etc. shall not have defects that affect the
measurement function of the thermal imager.
7.1.4 Temperature measurement consistency
The thermal imager shall be tested for temperature measurement consistency under
laboratory environmental temperature and humidity conditions.
7.2 Calibration methods
7.2.1 Appearance
Take manual and visual inspection, the appearance of the calibrated thermal imager
must meet the requirements of 7.1.1.
7.2.2 Display
Take manual and visual inspection, the display device of the calibrated thermal imager
must meet the requirements of 7.1.2.
7.2.3 Error of indication
7.2.3.1 Selection of calibration temperature point.
The selection of the calibration temperature point is the upper and lower limits of the
range and the middle value of the range.
7.2.3.4 Determine the measurement distance according to the requirements of the
user or the focusing range of the thermal imager, the optical resolution and the target
diameter of the blackbody radiation source. Adjust the position of the thermal imager,
make the thermal imager aim at the target center of the blackbody radiation source in
the axial direction of the blackbody radiation source, and make the measured object
clearly imaged.
7.2.3.9 Calculate the average radiation temperature, tBBi, of the blackbody radiation
source.
7.2.4 Temperature measurement consistency
7.2.4.1 Set the temperature of the blackbody radiation source according to the actual
use of the thermal imager or according to user requirements, usually it is 100°C.
7.2.4.2 Clean the exposed optical components of the thermal imager according to the
requirements of the instruction manual of it.
7.2.4.3 Install additional optical lens or attenuator according to user requirements.
7.2.4.7 Before performing calibration for temperature measurement consistency, other
operations that have an impact on the measurement results required by the instruction
manual of the thermal imager, such as clearing (if required by the calibrated thermal
imager) shall be completed.
7.2.4.10 Calculate the value, φi, of temperature measurement consistency of the
calibrated thermal imager.
8 Expression of Calibration Results
The calibration results shall be reflected on the calibration certificate or calibration
report.
9 Recalibration Time-Interval
The time interval for recalibration is determined by the user according to the use
situation, and it is recommended to be 1 year. It shall be shortened appropriately when
it is used frequently.
JJF 1187-2008
NATIONAL METROLOGICAL TECHNICAL SPECIFICATIONS
Calibration Specification for Thermal Imagers
Issued on. JANUARY 31, 2008
Implemented on. APRIL 30, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine
This Specification was approved by the General Administration of Quality Supervision,
Inspection and Quarantine on January 31, 2008; and should come into effect on April
30, 2008.
Administrative organization.
China Temperature Measurement Technology Committee
Chief drafting organization.
National Institute of Metrology, China
Participating drafting organization.
Guangzhou Sat Electric Infrared Technology Co., Ltd.
This Specification shall be interpreted by China Temperature Measurement
Technology Committee
Calibration Specification
for Thermal Imagers
Chief drafting staffs of this Specification.
Bai Chengyu (National Institute of Metrology, China)
Xing Bo (National Institute of Metrology, China)
Yuan Zundong (National Institute of Metrology, China)
Participating drafting staffs.
Wu Yigang (Guangzhou Sat Electric Infrared Technology Co., Ltd.)
Table of Contents
1 Scope... 5
2 Normative References... 5
3 Terms and Metrological Unit... 5
3.1 Terms... 5
3.2 Metrological unit... 5
4 Overview... 6
5 Metrological Characteristics... 6
5.1 Appearance... 6
5.2 Display... 6
5.3 Error of Indication... 6
5.4 Temperature measurement consistency... 7
6 Calibration Conditions... 7
6.1 Environmental conditions... 7
6.2 Standards and other equipment... 7
7 Calibration Items and Methods... 8
7.1 Calibration items... 8
7.2 Calibration methods... 8
8 Expression of Calibration Results... 12
9 Recalibration Time-Interval... 13
Appendix A Evaluation on the Uncertainty of Indication Error Calibration of
Thermal Imager... 14
Appendix B Recording Format of Calibration Results... 18
Appendix C Data Page Format of Thermal Imager Calibration Certificate... 20
Calibration Specification for Thermal Imagers
1 Scope
This Specification is applicable to the calibration of thermal imagers with temperature
measurement function in the range of -20°C ~ 2000°C.
2 Normative References
This Specification quoted the following references.
JJF 1001-1998 General Terms in Metrology and Their Definitions
JJG 1007-2007 Temperature Metrological Terms and Their Definitions
GB/T 19870-2005 Industrial Inspecting Thermal Imagers
JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement
When using this Specification, pay attention to adopting the current effective editions
of the above normative references.
3 Terms and Metrological Unit
3.1 Terms
3.1.1 The terms and definitions given in GB/T 19870-2005 Industrial Inspecting
Thermal Imagers are applicable to this Specification.
3.1.2 Error of indication
The error of indication for the thermal imager refers to the difference between the
temperature indication of the thermal imager and the agreed true value of the
measured blackbody radiation source temperature.
3.2 Metrological unit
The temperature unit is Celsius (°C) or Kelvin (K).
4 Overview
The thermal imager can convert the thermal radiation on the surface of the object into
a visible image; and correct through emissivity, reflectance and transmittance and
accurately measure the surface temperature and surface temperature distribution of
the object.
5 Metrological Characteristics
5.1 Appearance
5.2 Display
The display of the thermal imager shall be free of defects that affect calibration.
5.3 Error of Indication
The error of indication for temperature of the thermal imager is determined under
calibration laboratory conditions.
5.4 Temperature measurement consistency
The consistency of the temperature measurement results in different areas of the
thermal imager's field of view is the ability of the thermal imager to accurately reflect
the surface temperature distribution of the measured object.
6 Calibration Conditions
6.1 Environmental conditions
6.1.1 The ambient temperature of the calibration laboratory shall be (23±5) °C, while
the humidity shall not be greater than 85% RH (no condensation).
6.2 Standards and other equipment
6.2.1 Standard instrument
Generally, a platinum resistance thermometer, a thermocouple (with corresponding
electrical measuring equipment) or a radiation thermometer is used as a standard
instrument to measure the temperature of the blackbody radiation source.
7 Calibration Items and Methods
7.1 Calibration items
7.1.1 Appearance
The thermal imager's housing, mechanical adjustment parts, exposed optical
components, keys, electrical connections, etc. shall not have defects that affect the
measurement function of the thermal imager.
7.1.4 Temperature measurement consistency
The thermal imager shall be tested for temperature measurement consistency under
laboratory environmental temperature and humidity conditions.
7.2 Calibration methods
7.2.1 Appearance
Take manual and visual inspection, the appearance of the calibrated thermal imager
must meet the requirements of 7.1.1.
7.2.2 Display
Take manual and visual inspection, the display device of the calibrated thermal imager
must meet the requirements of 7.1.2.
7.2.3 Error of indication
7.2.3.1 Selection of calibration temperature point.
The selection of the calibration temperature point is the upper and lower limits of the
range and the middle value of the range.
7.2.3.4 Determine the measurement distance according to the requirements of the
user or the focusing range of the thermal imager, the optical resolution and the target
diameter of the blackbody radiation source. Adjust the position of the thermal imager,
make the thermal imager aim at the target center of the blackbody radiation source in
the axial direction of the blackbody radiation source, and make the measured object
clearly imaged.
7.2.3.9 Calculate the average radiation temperature, tBBi, of the blackbody radiation
source.
7.2.4 Temperature measurement consistency
7.2.4.1 Set the temperature of the blackbody radiation source according to the actual
use of the thermal imager or according to user requirements, usually it is 100°C.
7.2.4.2 Clean the exposed optical components of the thermal imager according to the
requirements of the instruction manual of it.
7.2.4.3 Install additional optical lens or attenuator according to user requirements.
7.2.4.7 Before performing calibration for temperature measurement consistency, other
operations that have an impact on the measurement results required by the instruction
manual of the thermal imager, such as clearing (if required by the calibrated thermal
imager) shall be completed.
7.2.4.10 Calculate the value, φi, of temperature measurement consistency of the
calibrated thermal imager.
8 Expression of Calibration Results
The calibration results shall be reflected on the calibration certificate or calibration
report.
9 Recalibration Time-Interval
The time interval for recalibration is determined by the user according to the use
situation, and it is recommended to be 1 year. It shall be shortened appropriately when
it is used frequently.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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