Why Thermal Sensitivity Matters? The Key to Accurate Detection in Security Systems

As security risks continue to grow, it is crucial not only to detect intruders but also to accurately identify them and minimize false alarms. That is why modern security technologies, such as Teledyne FLIR thermal cameras, focus on maximizing sensor sensitivity. A key parameter in this regard is NETD (Noise Equivalent Temperature Difference) – the thermal sensitivity of a camera, which directly impacts image quality and detection accuracy. But what exactly does it mean, and why is it so important?

What is NETD, and How Does It Affect Thermal Camera Performance?

NETD is a unit that expresses the smallest temperature difference a thermal camera can detect. It is measured in milli Kelvin (mK), and the lower the value, the higher the camera’s sensitivity.

Imagine two individuals standing side by side—one wearing a light jacket, the other in a thick winter coat. A high-sensitivity thermal camera (with a low NETD value) can detect even minor temperature differences, producing sharp and detailed images even in complete darkness or fog. Conversely, a camera with a higher NETD captures fewer details, resulting in a blurry image where distinguishing objects becomes more difficult.

What is the Ideal NETD for Security Applications?

Thermal camera sensitivity varies depending on the model and its intended use. Below is a general guide on how different NETD values affect performance:

• <25 mK – Excellent image quality, ideal for critical infrastructure and high-security locations.
• <40 mK – Very good quality, suitable for industrial sites and extensive perimeter protection.
• <50 mK – Adequate for most applications, but may introduce slight distortions under extreme conditions.
• <60 mK and above – Basic detection level, with higher noise and reduced accuracy.

For professional security applications, NETD <25 mK is the most recommended as it ensures clear imaging even under the most challenging conditions.

Advantages of a Low NETD Value

Low thermal sensitivity brings several critical benefits, making security surveillance more reliable:

• Higher image quality – Crisp details even in poor visibility conditions.
• More precise object analysis – Lower risk of false alarms from people or vehicles.
• Reliable performance in extreme conditions – Operates effectively in fog, snow, or heavy rain.
• Extended detection range – Intruders can be tracked from greater distances.

For example, the FLIR FH-Series with NETD <25 mK is among the best solutions for perimeter protection in environments where high detection accuracy is required.

Combining Thermal Cameras and Radars for Maximum Accuracy

While a thermal camera alone is a powerful tool, its capabilities are significantly enhanced when paired with radar technology. The combination of thermal imaging and radar detection allows for not just spotting intrusions but also automatic tracking and precise visual verification of targets.

One of the most effective solutions is the FLIR Elara R-190 radar, which integrates thermal imaging with radar-based detection. This system provides:

• Person detection up to 125 meters, vehicle detection up to 300 meters.
• Reliable performance in all weather conditions—works in rain, snow, and fog.
• Geo-location accuracy—pinpoints the exact location of an intruder.
• Low power consumption and easy installation.

This combination maximizes detection accuracy while minimizing false alarms, making it ideal for securing industrial sites, airports, military bases, and critical infrastructure.

Why Invest in Security Technologies with Low NETD?

If you aim to secure your facility with maximum reliability, NETD should be a key consideration when choosing thermal imaging technology. At SCANLOCK, we provide cutting-edge Teledyne FLIR security solutions that guarantee accurate detection, high durability, and advanced analytics. Whether you need protection for an industrial facility, energy infrastructure, or a sensitive military site, we help you find the perfect tailored solution.

Want to Learn More? Contact us for a custom security solution designed specifically for your needs.