Understanding Pulsar’s New Terminology
With the launch of its newest thermal imaging devices, Pulsar has begun to use the term sNETD, or "System NETD." But what does this term mean, and why is it relevant to you, the hunter?
What is NETD?
NETD, or Noise Equivalent Temperature Difference, is a key metric of a thermal device’s sensitivity. It measures the smallest temperature variation the device can detect and is expressed in millikelvins (mK). This rating is particularly critical when identifying and differentiating objects in challenging weather such as heavy rain or dense fog, where thermal contrast is minimal, and objects in the field of view may share similar temperatures. In such scenarios, a lower NETD value enables sharper differentiation between objects.
For instance, a thermal device with a 25 mK NETD rating can effectively detect a hog in dense fog where the animal’s body heat blends closely with the ambient temperature. This precision allows hunters to spot their target despite the challenging conditions. Conversely, a device with a 40 mK NETD rating may struggle in the same situation, making the animal difficult to distinguish from its surroundings and significantly hindering the hunter’s ability to identify and track the target.
Recently, more devices have been marketed with NETD ratings of 40, 35, 25, or even 18 mK, with lower ratings generally preferred due to their superior performance in detecting subtle temperature differences in challenging conditions. However, it is essential to understand that these differences are most noticeable in humid environments. Under dry, clear conditions, the difference between devices with NETD values of 35 mK and 25 mK is often negligible, with spatial resolution taking precedence over thermal sensitivity in such scenarios.
Historically, Pulsar has exclusively reported the NETD value of its devices as the Native Sensor NETD, while many other brands opted to disclose only their System NETD. To eliminate confusion and ensure complete transparency, Pulsar now provides both measurements in its product specifications.
Native Sensor NETD vs. System NETD: Key Distinctions
Thermal imaging devices rely on two types of NETD ratings:
Native Sensor NETD
- Represents the sensor’s intrinsic ability to detect temperature differences without enhancements from software or algorithms.
- Reflects the sensor’s unaltered performance.
System NETD
Incorporates the effects of software algorithms that enhance the image by reducing noise and amplifying details.
Combines sensor capabilities with image processing tools.
While image processing algorithms can significantly improve performance, over-reliance on such enhancements can degrade image quality. Excessive processing may blur fine details, introduce lag during movement, or reduce clarity when scanning dynamic scenes. Such compromises can impact the device’s effectiveness in real-world applications. It is crucial to note that while algorithms can enhance System NETD, they do not alter the Native Sensor NETD, which remains a fixed metric.
Comparing NETD Values
Although NETD measurements generally adhere to standardized methodologies, slight variations can occur between laboratories. For example, in Europe—where Lynred, Pulsar’s sensor manufacturer, is based—independent testing results typically align closely with the manufacturer’s stated values.
However, System NETD introduces variability due to proprietary algorithms, making direct comparisons across brands challenging. Pulsar advises focusing on the Native Sensor NETD when evaluating devices, as it provides a more accurate representation of raw performance.
Note that a device with a <25 mK Native Sensor NETD will consistently deliver superior performance compared to one with a <25 mK System NETD. The former provides greater image clarity by showcasing the sensor’s true capabilities, while over-processed images can compromise fine details, reducing reliability.
Pulsar’s Commitment to Transparency
To support informed decision-making, Pulsar now includes both NETD and sNETD values in its product specifications. Here’s how this information is presented:
NETD: The primary metric, representing the sensor’s unassisted capabilities.
sNETD: A secondary value, reflecting enhancements from image processing algorithms.
Distinguishing between the two ratings ensures that users can evaluate devices with a comprehensive understanding of their capabilities. Many brands list only their System NETD, potentially obscuring the device’s true performance. Pulsar’s approach provides the transparency needed to make well-informed purchasing decisions.
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Why This Matters
By including both NETD values, Pulsar bridges the gap between marketing claims and real-world performance. Whether navigating dense fog as a hunter or relying on precise imaging as a professional, accurate specifications empower users to choose the best tool for their needs. Pulsar’s commitment to clarity ensures that the Native Sensor NETD reflects authentic performance, while the System NETD demonstrates how advanced algorithms enhance it.
For further insights on how NETD impacts performance, click here.
