Apparent Temperature Difference
The apparent temperature difference method of defining infrared signature gives the physical temperature difference (e.g. in kelvin) between the object of interest and the immediate background if the recorded radiance values had been measured from perfect blackbody sources. Problems with this method include differences in radiance across the object or the immediate background and the finite size of the detector's pixels. The value is a complex function of range, time, aspect, etc.
Read more about this topic: Infrared Signature
Famous quotes containing the words apparent, temperature and/or difference:
“It is difficult to believe that even idiots ever succumbed to such transparent contradictions, to such gaudy processions of mere counter-words, to so vast and obvious a nonsensicality ... sentence after sentence that has no apparent meaning at all—stuff quite as bad as the worst bosh of Warren Gamaliel Harding.”
—H.L. (Henry Lewis)
“The bourgeois treasures nothing more highly than the self.... And so at the cost of intensity he achieves his own preservation and security. His harvest is a quiet mind which he prefers to being possessed by God, as he prefers comfort to pleasure, convenience to liberty, and a pleasant temperature to that deathly inner consuming fire.”
—Hermann Hesse (1877–1962)
“The only difference between a caprice and a life-long passion is that the caprice lasts a little longer.”
—Oscar Wilde (1854–1900)