The thermal radiometry can trigger events based on the temperature measured within the specified image areas. Note that you can define different measurement areas for every event profile.
To do so, you can create different temperature events, which react to different areas and trigger values.
Events of the Thermal Radiometry type can only be used if the sensor is running in linear mode. Open the Setup Menu > Image Settings > Thermal Sensor Settings dialog and activate the Linear Mode.
The temperature of objects in the image as determined by the thermal sensors is influenced mostly by the following factors:
Surface properties and object color
Distance from the sensor to the objects
Properties of the atmosphere between the sensor and the objects
This means that the sensor can deliver different temperature values depending on the distance to the object and the current
scene. In order to define events that are based on temperature trigger values, you first need to determine the current temperature
values measured in the scene. To do so, you can use the variables $(SEN.TTR.CELSIUS) and $(SEN.TTR.FAHRENHEIT). The determined values can then be used to set the trigger value defined below.
The measurement area can be defined as a rectangle or as a polygon.
Rectangle syntax:
image sensor, horizontal position, vertical position, width, height
0,270,190,100,100
Polygon syntax:
image sensor, poly=<hor. coordinate>x<vert. coordinate>{/<hor. coordinate>x<vert. coordinate>}0,poly=270x190/270x289/369x289/369x190
The measurement area refers to the entire image sensor.
If the camera image has been mirrored or rotated, the coordinate system of the windows changes accordingly.
|
Parameter |
Description |
|---|---|
|
Image sensor |
Selects the image sensor (camera image) to use for this area definition:
|
|
Horizontal position |
Number of pixels measured from the left edge of the visible image to the left border of the area (based on a MEGA image 1280x960). |
|
Vertical position |
Number of pixels measured from the bottom edge of the visible image to the bottom border of the area (based on a MEGA image 1280x960). |
|
Width |
Width of the area in pixels (based on a MEGA image 1280x960). |
|
Height |
Height of the area in pixels (based on a MEGA image 1280x960). |
|
Horizontal Coordinate |
Number of pixels measured horizontally from the left edge of the visible image to the polygon corner (based on a MEGA image 1280x960). |
|
Vertical Coordinate |
Number of pixels measured vertically from the bottom edge of the visible image to the polygon corner (based on a MEGA image 1280x960). |
If you would like to define a new measurement area, open the Environment Events dialog and follow the instructions of the Graphically Entering Image Areas help page.
Allows setting the basic mode for the trigger value. The following modes are available:
Absolute Temperature: The Trigger Value is interpreted as an absolute (i.e., not relative) temperature.
Reference Temperature: The trigger value is interpreted as the average temperature of the defined Reference Area.
Use this parameter to specify when to trigger the event. The following modes are available:
One Pixel: Triggers an event if at least one pixel in the measurement area is higher or lower than the trigger value.
Percent: Triggers an event if at least the specified percentage of all pixels in the measurement area is higher or lower than the trigger value.
The measurement area can be defined as a rectangle or as a polygon.
Rectangle syntax:
image sensor, horizontal position, vertical position, width, height
0,270,190,100,100
Polygon syntax:
image sensor, poly=<hor. coordinate>x<vert. coordinate>{/<hor. coordinate>x<vert. coordinate>}0,poly=270x190/270x289/369x289/369x190
The reference area refers to the entire image sensor.
If the camera image has been mirrored or rotated, the coordinate system of the windows changes accordingly.
|
Parameter |
Description |
|---|---|
|
Image sensor |
Selects the image sensor (camera image) to use for this area definition:
|
|
Horizontal position |
Number of pixels measured from the left edge of the visible image to the left border of the area (based on a MEGA image 1280x960). |
|
Vertical position |
Number of pixels measured from the bottom edge of the visible image to the bottom border of the area (based on a MEGA image 1280x960). |
|
Width |
Width of the area in pixels (based on a MEGA image 1280x960). |
|
Height |
Height of the area in pixels (based on a MEGA image 1280x960). |
|
Horizontal Coordinate |
Number of pixels measured horizontally from the left edge of the visible image to the polygon corner (based on a MEGA image 1280x960). |
|
Vertical Coordinate |
Number of pixels measured vertically from the bottom edge of the visible image to the polygon corner (based on a MEGA image 1280x960). |
If you would like to define a new reference area, open the Environment Events dialog and follow the instructions of the Graphically Entering Image Areas help page.
Show the temperatures either in degrees Centigrade (°C) or Fahrenheit (°F).
Enter the temperature value that is used to trigger an event when it exceeds or when it drops below the value (depending on the setting of the Comparison parameter, see below).
Select between triggering the event when it exceeds or when it drops below the specified trigger value.
Higher than: Triggers an event if the temperature in the measurement area is higher than the trigger value.
Lower than: Triggers an event if the temperature in the measurement area is lower than the trigger value.
Define how often the event is to be triggered:
First: The event is triggered only once, i.e., when the condition is first detected.
Every: The event is triggered every time as long as the condition is true.
To display the measurement area of a Thermal Radiometry event profile in the live image, select a color from the selection list. In addition, you can set the following options for the measurement area:.
Show Thermal Radiometry Level Meter. Shows the current temperature of the event profile within the defined measurement area as a level meter.
Show Thermal Radiometry Level Temperature: Shows the current temperature of the event profile within the defined measurement area.
Show Thermal Radiometry Profile Name: Shows the name of the event profile within the defined measurement area.
The following options are available for the measurement area, the temperature value and the profile name:
Off: Does not show the element.
Auto: Shows the element with a color that depends on the color palette of the thermal sensor.
Color: Shows the element using the selected color.
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