The thermal spotmeter can trigger events based on the measured temperature. The measurement area covers the four pixels at the center of the image.
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.TSR.CELSIUS) and $(SEN.TSR.FAHRENHEIT) for the right sensor or $(SEN.TSL.CELSIUS) and $(SEN.TSL.FAHRENHEIT) for the left sensor. The determined values can then be used to set the trigger value defined below.
In order to exactly point the sensor to the object you want to measure, the camera can display crosshairs in the live image. The circle at the center of the crosshairs shows the four pixels that are used for measuring.
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.
Click on the Set button to activate your settings and to save them until the next reboot of the camera.
Click on the Factory button to load the factory defaults for this dialog (this button may not be present in all dialogs).
Click on the Restore button to undo your most recent changes that have not been stored in the camera permanently.
Click on the Close button to close the dialog. While closing the dialog, the system checks the entire configuration for changes. If changes are detected, you will be asked if you would like to store the entire configuration permanently.