A camera capable of see substances “invisible” and to help research teams to quickly search for bloodstains at a crime scene, without spoiling the evidence.
camera is still a prototype and was developed by Dr. Stephen Morgan, Michael Myrick and his colleagues at the University of South Carolina
It can detect blood stains even if they are diluted in a ratio of 1 part in 100.
However, it is a toxic compound and may dilute the samples to a level that impairs the recovery of DNA, and pollute the patterns of spread of blood; that forensic experts use to determine how the victim died. Luminol can also react with chlorine , bleach, rust, coffee and fizzy liquid, indicating false positive results.
Since the camera is capable of distinguishing the blood of these four elements and can be used for stains that require further chemical analysis, for not interfering in the sample.
To capture an image, the device delivers pulses of infrared light onto a surface and detects what is reflected. A transparent layer of the protein albumin, 8 micrometers thick, is placed in front of the sensor and acts as a filter, displaying the blood spot (even diluted and therefore invisible to the naked eye) to filter out wavelengths that are not characteristic of blood proteins
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