Basic Parameters Introduction

NETD (mK Number) 

The term NETD stands for Noise Equivalent Temperature Difference, which refers to the thermal sensitivity and resolution of a thermal imaging camera. It directly reflects the quality of the camera's installed sensor. The lower the NETD value, the higher the clarity of the camera's image. Most devices from the HIKMICRO offering impressive values of ≤ 20 mK.

Thermal Resolution / Detector Size

The sensor serves as the foundation of a thermal imaging camera, playing a vital role in determining the overall performance of the system. Key parameters that define the sensor's capabilities include its resolution, measured by the sum of pixels, and pixel pitch. When it comes to resolution, a higher number of pixels directly translates to a superior image quality. Opting for a higher pixel count results in a sharper and more detailed display of the image. HIKMICRO offers kinds of 640x512 high resolution devices to meet needs of high image quality of users.

Pixel Pitch

Pixel pitch refers to the distance between individual pixels on a screen or display, and it is measured in micrometers (μm). The term "picture element pitch" is used to describe this distance. Specifically, pixel pitch is measured from the center of one pixel to the center of the adjacent pixel, both horizontally and vertically. Depending on the direction of measurement, different values may be obtained. In general, a smaller pixel pitch indicates a greater basic magnification and longer detection range with other specifications being the same. Most products from HIKMICRO are equipped with 12μm detector.

Aperture / Focal Length / F-Number

• The aperture is the main lens that focuses light into the focal point. The larger the aperture, the more light the system collects and the more details you can see.
• Focal length is the distance between the point in space at which distant light is focused and the center of the aperture.
• The f-number (e.g. F1.0) represents the ratio of the focal length to the objective lens diameter, indicating the field of view.

Field of View (Degree / m @100m)

Several key elements determine the field of view, including sensor size, basic magnification, and focal length. In general, devices with larger objective lenses have longer focal lengths, resulting in a smaller field of view, which is suitable for hunting in the open field. The devices with smaller focal lengths usually have a larger field of view which is suitable for hunting in forests because of the great overview. Our thermal products include large and small field of view devices to meet different needs from users.

Detection Range

The detection range refers to the maximum distance at which an object can be detected as a heat source. Devices with a longer focal length offer a higher detection range, making them more suitable for open terrain. Conversely, thermal devices with smaller lenses are better suited for forest areas. In these settings, a wider field of view, achieved through lower magnification, is advantageous. The detection range is typically determined using the Johnson criteria, which considers a target size of an upright standing man measuring 1.8 × 0.5 meters. However, it's important to note that this calculation is primarily theoretical and does not take factors like image quality into account. The detection distance of HIKMICRO’s device can reach up to 2600m (calculated with reference to Johnson criteria and other factors).

Basic Magnification / Digital Zoom

The basic magnification indicates the level of optical magnification when viewing the device's display. This magnification is customized for each device, depending on its type. Digital zoom refers to the act of enlarging the image on the screen. However, the perceived imaging performance can be affected by factors such as the device's resolution and the chosen zoom level. For HIKMICRO, based on extensive analysis of thermal hunting images, its self-developed image algorithm Zoom Pro gives ultra-clear images with impressive details and less pixilation, especially in digital zoom.

Frame Rate

The frame rate determines the number of image changes a device can achieve per second, measured in Hertz (Hz). The higher the frame rate, the better the image will be for viewing while in motion. To ensure a seamless and flicker-free display of moving objects, a minimum frame rate of 50 Hz is recommended in thermal image. Currently, thermal imaging cameras from HIKMICRO successfully meet this standard.