This section presents some data useful for evaluating the system performances. Those data were collected in real use conditions. As first step, the Cooling performances are reported by plotting both the Internal Air and the Internal Camera Body measurement. The In-Air temperature is measured by a sensor mounted on the front panel inside the cooling case; instead, for the camera body temperature, the sensor is in direct contact with the camera. Various temperature deltas are underlined in the following graph.
The following data display the contribution of the thermal noise to the image, and how much this can be reduced if the Cooling Box is used to lower and control the temperature to a fixed value. We have sampled Dark Frames at different camera body temperature.
The pictures above show how negative the impact of the thermal noise on the signal quality can be. In the first case (+25°C) the histogram is quite fulfilled by the thermal noise leaving a very small space to the signal, while in the second case (-5°C) the thermal noise is well confined in a small region of the histogram.
Thanks to the management system of the Cooling Box, the stability of the temperature, allows the user to more efficiently subtract the dark frames from the image, thus leaving most of the real signal coming from the subject available for processing. In the graph above it’s indicated that the thermal stabilization of the Setpoint during a period of 1.5 hours is less than ± 0.2 °C.