Thermal imaging & vision systems
Process monitoring of production line.
Thermal imaging cameras themselves provide the user with different operating modes that support correct temperature measurements under various conditions. Two functions commonly found in these cameras are a spotmeter and area measurements. The spotmeter finds the temperature at a particular point. The area function isolates a selected area of an object or scene and usually provides the maximum, minimum, and average temperatures inside that area. The temperature measurement range typically is selectable by the user. As an adjunct to the temperature range selection, most cameras allow a user to set up a colour scale or gray scale to optimise the camera image. In conveyor oven applications, the area function is typically used because pieces of cooked product are often randomly located on the conveyor. The camera can be programmed to find and measure the minimum and maximum temperatures within the defined area. If one of those setpoint temperatures were to fall outside the user- defined limits, an application program running on a PC or PLC would instantly
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Typical Go/No-Go inspection system using thermal imaging cameras.
The data is automatically logged into the QA system for trend analysis, so a warning can be generated if an excessive number of boxes begin to fail.
trigger an alarm, alerting the operator to check the thermal image on a video monitor or PC to find and remove the bad product, and/or adjust the cooking temperature. In the case of local monitoring, an IR camera’s digital I/O can be used to directly trigger an alarm device without additional software. However, food processing often benefits from higher level analytics that are available in third- party software that runs on a PC. These out-of-the-box solutions do not require the writing of application source
The camera can be set up to look at predefined areas of the flaps where glue should be applied, and verify spot sizes and their temperatures.
code. By adhering to commonly used machine vision interface standards such as GigE Vision and GenICam, a wide range of functionality is supported by this software. A simplified block diagram of conveyor monitoring is shown above. One thermal imaging camera is adequate for many applications, or a thermal imaging camera may be combined with a visible light camera to record other target object attributes, such as colour.
Teledyne FLIR
www.teledyneflir.com April 2023 Instrumentation Monthly
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