Thermal Imaging Cameras Tools 27/data sheet 4 Flashcards
TIC provides a pictorial representation of TEMPERATURE DIFFERENCES that are UNAFFECTED by smoke…
(company OFFICER may be BEST SUITED to carry TIC, doesn’t say must)
TIC detects infrared energy and electronically process it and display it into a viewable image
-IR wave length is most often unaffected by smoke
Who carries a TIC?
LADDER/ENGINE /BATTALION VEHICL
rescue
squad
haz mat company 1
BLACK…?
-least amount of heat and COOLEST object
may not be real cold..just COLDER than other objects
WHITE?
-most HEAT at scene (white-hot)
does not mean fire…only means it is HOTTER than rest of area being viewed
Shades of GRAY…
-temperature range between BLACK and WHITE
These shades of white, black and gray and their differences in colorization are known as THERMAL CONTRAST
some TICs also associate yellow/orange /red with hotter SPECIFIC temperature ranges
Low Contrast…
contrast -thermal contrast or temperature difference in order for thermal imager to display an image
may occur in COOLER areas where there is lack of heat present and all objects are close in temperature
High Contrast…
more heat present, both generated and absorbed by objects, the CLEARER and SHARPER the image will appear…this is true until THERMAL SATURATION …this occurs when everything in the viewing area is heated to temperatures beyond the capability of TIC..the overall are being view will lose contrast and appear whiter and featureless
Changing Thermal Contrast..
Thermal Images thrive on HEAT…..as conditions change from cooler to hotter, back to cooler, images viewed by TIC will change…may indicate FIRE being in close proximity…be aware of change from LOW contrast (cooler/darker) to High (hotter/whiter)
EI or L indicates?
shift of the camera in modes to compensate for higher temperatures
Convected Heat…
white swirling waves or smoke…most often near ceiling area…when searching for fire or extension, operators should attempt to detect convected heat along with its direction and velocity sooner than later….may indicate location of fire
ability to thermally image is dependent on the amount of energy being absorbed by an object
-object or heats source may be concealed by thickness or layering of material
Thermal Imaging cameras are carried and used at ?
ALL STRUCTURAL FIRE OPERATIONS BY ALL UNITS EQUIPPED WITH THIS TOOL
Operators of TIC…
- stay low and slowly scan area
- use 6 SIDED method of scanning (50 degree field of view)
- begin by looking STRAIGHT UP OVERHEAD (1) slowly lower TIC to find seam of ceiling and wall (2) follow seam to left (3) follow seam right (4) (OR LEFT/RIGHT-eventually lowering the TIC to floor area (5) remember look in the REAR
- TIC can be used for person in water, person in woods, ejected from vehicle
- hazmat-vapor clouds, spilled liquids
Thermal Imaging does not see through?
- clear glass or plastic- these act as mirror
- shiny sufaces will reflect- glass, waxed floors, water on floor
- water
GPS WAZE
GLASS/PLASTIC/SHINY/WATER
Average field of view?
50 degrees HORIZONTALLY
FOCal point-3 feet from the camera lens (within 3 feet is too close- may be blurry and out of focus)
-depth perception will vary from camera to camera
Steam and condensation or fogging on the SCBA facepiece, display screen and camera lens may distort clarity of image…
Wipe all 3 places to greatly improve clarity of images