Differential interference contrastmicroscopy principle

In addition, the 2N® Helios IP Verso intercom is very durable, works perfectly in environments from -40 °F to +140 °F and can endure sudden changes in weather. Communication between individual intercoms and the LAN network is secured using the 802.1x protocol and, thanks to a closed OS, the intercom is resistant to attacks by hackers.   Real night vision is enabled by an optional HD camera with an infrared light, which is also hidden from normal view. An intruder does not know he is being filmed, even at night. Thanks to scripts, the 2N® Helios IP Verso security intercom can also send a silent alarm to a pre-defined telephone number in case of a threat.

In order to use 2N Helios IP Verso with camera, it is necessary to order also 2N Helios IP - Video License (order code 209990901458) - RTSP stream server for door communicators 2N Helios IP.   In order to use the device for a maximum, you can order the enhanced license for door communicators 2N Helios IP - Gold licence (order code 209990900694), which offers:

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Differential interference contrastmicroscope

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2N® The 2N® Helios IP Verso is a security intercom that, thanks to its modularity, can be used everywhere you need to choose a specific function and purpose of use. For example, you can choose an HD camera with an infrared light and night vision or a smart card reader. It can not only be easily integrated into your current camera and monitoring system, but thanks to programmable scripts, also with KNX installation. Furthermore, the whole system can be also used as a security component to protect the building.

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Differential Interference Contrast (DIC) is a phase contrast technique that allows transparent structures to be visualized by exploiting changes in refractive index. In contrast to conventional phase contrast techniques, which are based on changes in optical path length, DIC is based on the gradient of the optical path length (rate of change in wavefront shear). Steep gradients produce the high contrast and 3-D relief effect that is characteristic of DIC.