Mr. Gregory B. McIntosh Profile

Gregory B. McIntosh

Deceased at Teasdale Consultants Ltd.

SPIE Involvement:

Author

Proceedings Article | 14 May 2018 Presentation + Paper

Emissivity considerations for thermographic fieldwork: why table values don't work

Gregory McIntosh, Roy Huff

Proceedings Volume 10661, 1066107 (2018) https://doi.org/10.1117/12.2304893

KEYWORDS: Temperature metrology, Oxides, Aluminum, Spatial resolution, Copper, Infrared cameras, Manufacturing

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Proceedings Article | 5 May 2017 Presentation + Paper

A 2016 update on standards and guidelines relevant to thermographers

Gregory McIntosh, Roy Huff

Proceedings Volume 10214, 1021402 (2017) https://doi.org/10.1117/12.2263636

KEYWORDS: Inspection, Cameras, Safety, Inspection equipment, Infrared cameras, Infrared imaging, Standards development, Thermography, Nondestructive evaluation, Imaging systems, Buildings, Infrared radiation, Infrared materials

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Proceedings Article | 11 May 2016 Paper

Classification of electrical problems detected by infrared thermography using a risk assessment process

Gregory McIntosh, Roy Huff

Proceedings Volume 9861, 98610T (2016) https://doi.org/10.1117/12.2224261

KEYWORDS: Interfaces, Electrical breakdown, Thermography, Infrared cameras, Convection, Inspection, Connectors, Injuries, Failure analysis, Switches

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Proceedings Article | 12 May 2015 Paper

Practical identification of moisture sources in building assemblies using infrared thermography

Gregory McIntosh, Antonio Colantonio

Proceedings Volume 9485, 948507 (2015) https://doi.org/10.1117/12.2087407

KEYWORDS: Inspection, Thermography, Cameras, Environmental sensing, Thermodynamics, Capacitance, Humidity, Infrared cameras, Absorption, Cladding

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Water, in its various phases, in any environment other than desert (hot or cold) conditions, is the single most destructive element that causes deterioration of materials and failure of building assemblies. It is the key element present in the formation of mold and fungi that lead to indoor air quality problems. Water is the primary element that needs to be managed in buildings to ensure human comfort, health and safety. Under the right thermodynamic conditions the detection of moisture in its various states is possible through the use of infrared thermography for a large variety of building assemblies and materials. The difficulty is that moisture is transient and mobile from one environment to another via air movement, vapor pressure or phase change. Building materials and enclosures provide both repositories and barriers to this moisture movement. In real life steady state conditions do not exist for moisture within building materials and enclosures. Thus the detection of moisture is in a constant state of transition. Sometimes you will see it and sometimes you will not. Understanding the limitations at the time of inspection will go a long way to mitigating unsatisfied clients or difficult litigation.

Moisture detection can be observed by IRT via three physical mechanisms; latent heat absorption or release during phase change; a change in conductive heat transfer; and a change in thermal capacitance. Complicating the three methodologies is the factor of variable temperature differentials and variable mass air flow on, through and around surfaces being inspected. Building enclosures come in variable assembly types and are designed to perform differently in different environmental regions. Sources for moisture accumulation will vary for different environmental conditions. Detection methodologies will change for each assembly type in different ambient environments.

This paper will look at the issue of the methodologies for detection of the presence of moisture and determination of the various sources from which it accumulates in building assemblies. The end objective for IRT based moisture detection inspections is not to just identify that moisture is present but to determine its extent and source. Accurate assessment of the source(s) and root cause of the moisture is critical to the development of a permanent solution to the problem.

SPIE Conference Volume | 21 March 1989

Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control

Conference Committee Involvement (5)

Thermosense: Thermal Infrared Applications XLI

15 April 2019 | Baltimore, MD, United States

Thermosense: Thermal Infrared Applications XL

16 April 2018 | Orlando, FL, United States

Thermosense: Thermal Infrared Applications XXXIX

11 April 2017 | Anaheim, CA, United States

Thermosense: Thermal Infrared Applications XXXVIII

18 April 2016 | Baltimore, MD, United States

Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control

27 March 1989 | Orlando, FL, United States

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