UNE MÉTHODE REPRODUCTIBLE
Comment l’utiliser
- Create a useful temperature difference: for envelope checks, indoor and outdoor temperatures should be stable and meaningfully different.
- Set or note emissivity and reflected-temperature assumptions; avoid shiny metal and glass when possible.
- Scan a broad area first, then compare the suspect spot with nearby surfaces built in the same way.
- Change the viewing angle. A hot or cold patch that moves with the camera may be a reflection.
- Confirm the pattern with another method such as an air-leakage check, moisture meter or direct temperature measurement.
INTERPRÉTER LA MESURE
Comment interpréter le résultat
- The color palette is relative to the selected scale; bright colors do not automatically mean dangerous heat.
- Surface temperature is not the same as the temperature inside a wall or pipe.
- A repeatable shape tied to construction details is more useful than one isolated pixel value.
VÉRIFIER LA MÉTHODE
Problèmes courants et vérifications
Problème
Windows and metal show the room or the operator.
Que faire
These surfaces reflect infrared radiation. Change angle or use a nearby matte reference surface.
Problème
The whole image changes color while scanning.
Que faire
The camera may be auto-scaling. Lock a sensible temperature span before comparing two areas.
Problème
A cold patch appears only in windy weather.
Que faire
Suspect air leakage as well as insulation. Inspect seals and confirm under repeatable conditions.
S’ARRÊTER AVANT LE DANGER
Limite de sécurité
- Keep clear of exposed electrical parts, hot surfaces and moving machinery while concentrating on the screen.
- Do not remove covers from energized equipment just to obtain an image.
- Treat a thermal anomaly as evidence for investigation, not permission to touch or dismantle equipment.
GUIDE D’ACHAT RAISONNÉ
Critères de choix
- Thermal resolution and a focus system usually matter more than a very wide advertised temperature range.
- Choose adjustable emissivity, manual span control and a way to export original images with measurement data.
- A wider field of view helps in small rooms; close-focus capability helps with terminals and small components.
Types d’instruments
Idéal pour: Occasional surveys when compact size matters.
Idéal pour: Fast whole-room scans at normal distances.
Idéal pour: Small details, electrical inspection and documented comparisons.
Fonctions courantes
Thermal sensor resolutionFocus distanceManual temperature spanAdjustable emissivityRadiometric image export
Ce qui mérite un supplément
- Real detector resolution rather than enlarged display pixels
- Manual focus for terminals and small defects
- Exported images that retain temperature data
Ce qui ne mérite généralement pas le supplément
- Extreme high-temperature range for ordinary homes
- A large number of color palettes
- Software upscaling presented as sensor resolution