Thermal Cameras

Thermal cameras are advanced devices that detect infrared energy emitted by objects to visualize temperature differences. They are used in an extremely wide range of applications, from PCB repair and building insulation inspection to industrial maintenance processes and hobbyist projects. By visualizing overheating components, energy losses, water leaks, or problems caused by mechanical friction that are invisible to the naked eye, these devices significantly speed up troubleshooting processes.

Thermal Camera Selection Criteria

There are several critical technical parameters to consider when choosing the right thermal camera. Resolution refers to the pixel count of the detector and directly affects image clarity. Thermal sensitivity (NETD) indicates the smallest temperature difference the camera can detect and is vital in applications where minute temperature deltas are critical, such as inspecting electronic boards. Furthermore, the temperature measurement range, frame rate, manual focus capability, and radiometric data recording features should be evaluated based on the use case scenario. When selecting between compact phone-attached modules, handheld devices, and fixed-mount industrial cameras, it is essential to first determine the scale of the problem to be solved and the environmental conditions.

Common Mistakes and Tips

• Incorrect emissivity setting: If the emissivity value is not configured according to the surface material, temperature readings can deviate significantly. This error is more pronounced on shiny metal surfaces.
• Ignoring focal distance: Using a fixed-focus camera for PCB inspection at very close range results in blurry images and incorrect temperature measurements. A macro lens or manual focus is essential for such tasks.
• Impact of reflected temperature: Infrared radiation reflected from other hot or cold sources in the environment can create ghost temperature anomalies, especially on low-emissivity surfaces.
• Considering resolution the sole factor: A high-resolution sensor with poor sensitivity (NETD) may not distinguish small temperature differences. It is crucial to evaluate both ends of the specification spectrum.