The mentioned optical filtering and bursting of light sources might not be sufficient to reduce
disturbing uncorrelated sunlight. The remaining background illumination can still saturate the sensor for typical integration times which can lead to a decrease of accuracy or pixel failures. In addition , there are other causes for uncorrelated
disturbances. The unavoidable dark current of a semiconductor device especially, can have a considerable influence particularly at higher temperatures. For example, an increase in temperature of 80 degrees leads to a dark current which
can be 1000 times higher and thus would significa ntly decrease measurement accuracy. Obviously
solutions must be found, in order to reduce the disturbing influence of any uncorrelated signal .