Thermal Imaging Buying Guide
Thermal imaging cameras are powerful tools used to detect temperature differences in objects, making them useful for a wide range of applications, including hunting, birding, predictive maintenance, building inspection and search & rescue operations.
Key Considerations
1. Resolution
- Look for a thermal imager with a high resolution (e.g. 320x240 or higher) for clear and detailed images.
- Consider the pixel pitch (sometimes called pixel interval), which affects the camera's sensitivity and accuracy. A higher number gives better thermal sensitivity and a clearer image in low contrast. A lower number gives higher resolution, a more compact design and a wider FOV.
2. Sensitivity
- Check the camera's thermal sensitivity (NETD) for accurate temperature measurements.
- A lower NETD value indicates higher sensitivity.
3. Field of View (FOV)
- Consider the working distance and required image size. Note that this changes with magnification.
4. Additional Features
- Wi-Fi and Bluetooth connectivity: enables easy data transfer and streaming.
- Battery life: consider a camera with a long battery life or a replaceable battery.
- Durability: assess the camera's build quality and IP rating for harsh environments.
- Screen: a decent screen can make all the difference to your viewing experience.
5. Ergonomics
- Make sure the thermal imager's shape and size will suit your needs.
Sensor resolution and image quality
An example of different sensor resolutions on image quality. The top image is lower resolution; the bottom is higher resolution.
Lens Size
Lens size and image quality
An example of a 35mm lens (top) compared to a 50mm lens (bottom), using the same sensor.
In thermal imaging, the lens size refers to the diameter of the lens, which affects the camera's field of view (FOV), resolution and sensitivity. A larger lens size generally provides:
- Wider Field of View (FOV): a larger lens captures more of the scene, allowing you to detect temperature differences over a broader area.
- Higher Resolution: a larger lens can resolve smaller temperature differences, resulting in more detailed images.
- Improved Sensitivity: a larger lens collects more infrared radiation, enhancing the camera's ability to detect subtle temperature changes.
- Improved Distance: a larger lens typically gives a higher maximum detection range, at the cost of minimum focusing distance.
Still need more help?
Our staff are experienced experts and would be more than happy to talk about options with you. Please call or email us today, or see the heat for yourself with our full range of thermal imaging products, available in an extensive range of sizes and qualities.