CSI TO THE RESCUEEEEE!!!!

Tuesday, September 2, 2008

I am TOTALLY IN LOVE with CSI!! WHOOOTSS!! HAHAHAAA...oh, and yeh...You know, i wasn't wasting my time chasing just another series, but this show has shown me how science plays a BIG role in solving cases!

In the series, i found devices that crime scene investigators use to spot evidences with the aid of thermal radiation. Well....read up on how they work!!!

Thermal Radiation. Also of value to the forensic scientist is the sensitivity of materials to radiation in the thermal (IR) infrared portion of the electromagnetic spectrum. This heat-seeking ability is responsible for such diverse phenomena as night vision and IR luminescence. Some inks, when exposed to blue-green light, will absorb the radiation and will re-radiate infrared light. This technique utilizes infrared-sensitive film to record the light emanating from the surface of an illegally altered document. IR luminescence has also been used successfully to reveal writing that has been erased. Another important application of infrared photography arises from the differences in IR absorption by different inks. Techniques of IR photography, as well as oblique lighting, have also been used successfully in order to reveal the contents of a document that has been charred in a fire.
Posted by xiaowei aunty at 11:56 PM