Calibration of uncooled thermal infrared cameras
The calibration of uncooled thermal infrared (IR) cameras to absolute temperature measurement is a time-consuming, complicated process that significantly influences the cost of an IR camera. Temperature-measuring IR cameras display a temperature value for each pixel in the thermal image. Calibration...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-06-01
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| Series: | Journal of Sensors and Sensor Systems |
| Online Access: | http://www.j-sens-sens-syst.net/4/187/2015/jsss-4-187-2015.pdf |
| _version_ | 1818539242499866624 |
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| author | H. Budzier G. Gerlach |
| author_facet | H. Budzier G. Gerlach |
| author_sort | H. Budzier |
| collection | DOAJ |
| description | The calibration of uncooled thermal infrared (IR) cameras to absolute
temperature measurement is a time-consuming, complicated process that
significantly influences the cost of an IR camera. Temperature-measuring IR
cameras display a temperature value for each pixel in the thermal image.
Calibration is used to calculate a temperature-proportional output signal
(IR or thermal image) from the measurement signal (raw image) taking into
account all technical and physical properties of the IR camera. The paper
will discuss the mathematical and physical principles of calibration, which
are based on radiometric camera models. The individual stages of calibration
will be presented. After start-up of the IR camera, the non-uniformity of
the pixels is first corrected. This is done with a simple two-point
correction. If the microbolometer array is not temperature-stabilized, then,
in the next step the temperature dependence of the sensor parameters must be
corrected. Ambient temperature changes are compensated for by the shutter
correction. The final stage involves radiometric calibration, which
establishes the relationship between pixel signal and target object
temperature. Not all pixels of a microbolometer array are functional. There
are also a number of defective, so-called "dead" pixels. The discovery of
defective pixels is a multistep process that is carried out after each stage
of the calibration process. |
| first_indexed | 2024-12-11T21:39:27Z |
| format | Article |
| id | doaj.art-9e9f8b892a7f4466a270a812de455608 |
| institution | Directory Open Access Journal |
| issn | 2194-8771 2194-878X |
| language | English |
| last_indexed | 2024-12-11T21:39:27Z |
| publishDate | 2015-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Journal of Sensors and Sensor Systems |
| spelling | doaj.art-9e9f8b892a7f4466a270a812de4556082022-12-22T00:49:53ZengCopernicus PublicationsJournal of Sensors and Sensor Systems2194-87712194-878X2015-06-014118719710.5194/jsss-4-187-2015Calibration of uncooled thermal infrared camerasH. Budzier0G. Gerlach1Technische Universität Dresden, Electrical and Computer Engineering Department, Solid-State Electronics Laboratory, Dresden, GermanyTechnische Universität Dresden, Electrical and Computer Engineering Department, Solid-State Electronics Laboratory, Dresden, GermanyThe calibration of uncooled thermal infrared (IR) cameras to absolute temperature measurement is a time-consuming, complicated process that significantly influences the cost of an IR camera. Temperature-measuring IR cameras display a temperature value for each pixel in the thermal image. Calibration is used to calculate a temperature-proportional output signal (IR or thermal image) from the measurement signal (raw image) taking into account all technical and physical properties of the IR camera. The paper will discuss the mathematical and physical principles of calibration, which are based on radiometric camera models. The individual stages of calibration will be presented. After start-up of the IR camera, the non-uniformity of the pixels is first corrected. This is done with a simple two-point correction. If the microbolometer array is not temperature-stabilized, then, in the next step the temperature dependence of the sensor parameters must be corrected. Ambient temperature changes are compensated for by the shutter correction. The final stage involves radiometric calibration, which establishes the relationship between pixel signal and target object temperature. Not all pixels of a microbolometer array are functional. There are also a number of defective, so-called "dead" pixels. The discovery of defective pixels is a multistep process that is carried out after each stage of the calibration process.http://www.j-sens-sens-syst.net/4/187/2015/jsss-4-187-2015.pdf |
| spellingShingle | H. Budzier G. Gerlach Calibration of uncooled thermal infrared cameras Journal of Sensors and Sensor Systems |
| title | Calibration of uncooled thermal infrared cameras |
| title_full | Calibration of uncooled thermal infrared cameras |
| title_fullStr | Calibration of uncooled thermal infrared cameras |
| title_full_unstemmed | Calibration of uncooled thermal infrared cameras |
| title_short | Calibration of uncooled thermal infrared cameras |
| title_sort | calibration of uncooled thermal infrared cameras |
| url | http://www.j-sens-sens-syst.net/4/187/2015/jsss-4-187-2015.pdf |
| work_keys_str_mv | AT hbudzier calibrationofuncooledthermalinfraredcameras AT ggerlach calibrationofuncooledthermalinfraredcameras |