Thermal imaging cameras can see through light fog and rain – but their performance is certainly reduced, and the worse the weather conditions, the poorer the visibility becomes. Having said this, in many foggy conditions, thermal imaging continues to offer improved image captured when compared to standard CCTV cameras. System planners are used to taking account of occasional poor performance in the visible part of the spectrum due to bad weather, and the IR image capture is no different. Unlike conventional CCTV, thermal cameras are not hampered at all by smoke or changing light conditions.
In planning a surveillance system it has to be remembered that thermal imaging cameras can’t see underwater or through glass because the infra-red heat is disrupted. So heavy fog and rain will reduce image resolution – exactly how much, depends on a range of factors, including the size and temperatures of the target object and the temperature of the surrounding environment. There are also many different types of fog, with different sizes and densities of water droplets (aerosols). For example urban and rural fog tends to be much less of a problem than marine fog. System planners need to take all these factors into account.
In planning a surveillance system it has to be remembered that thermal imaging cameras can’t see underwater or through glass because the infra-red heat is disrupted. So heavy fog and rain will reduce image resolution – exactly how much, depends on a range of factors, including the size and temperatures of the target object and the temperature of the surrounding environment. There are also many different types of fog, with different sizes and densities of water droplets (aerosols). For example urban and rural fog tends to be much less of a problem than marine fog. System planners need to take all these factors into account.
No comments:
Post a Comment