Thermographic measurement of lumber moisture content in a progressive kiln This report presents the results of the work carried out in the project "Development of industrial thermal camera measurement for energy-efficient control of wood drying", a project funded by the Kamprad Family Foundation. The project developed, implemented, and evaluated an industrial measurement system for real-time determination of moisture content and moisture distribution in wood during an ongoing drying process. The work included the technical development of a measurement setup for feedback-type progressive kilns, the development of prediction models for wood moisture content, and the development of associated software. The measurement technology was based on thermographic images collected with a thermal camera mounted in the attic space above the passing lumber stacks, as well as information on the properties of the drying air. With knowledge of the wood's temperature state in combination with air temperature and humidity, the drying process could be monitored and evaluated in real time. The software for processing thermographic data, including an operator interface, was installed on a regular desktop computer in the operator room. During the project period, the measurement system was in continuous operation for about one year with only a few short interruptions for maintenance, system updates, and unplanned power outages. Relatively simple instrument maintenance was carried out about two to three times per year. The software's operator interface presented real-time thermographic images of the passing wood and diagrams of the wood's moisture content and distribution. Data collected was continuously and saved to enable long-term analysis. The conclusion is that the measurement system is a useful tool to estimate the moisture content, moisture distribution and inspect the kiln. This information can be used by the drying operator to assess the progress of the drying process and to manually correct the process. Since the measurements were carried out continuously and without either disturbing the production or requiring any extra manual handling by personnel, the measurement system can be considered to meet the requirements of being both non-contact and automatic. The measurement system offered a new way to control the drying process in a progressive lumber kiln with the goal of less over-drying, lower energy consumption, better quality and yield. The method has the potential to replace manual measurements, thus improving worker safety.