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- 摘要
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- 实验方案
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Forensic Analysis - From Death to Justice || Usage of Infrared-Based Technologies in Forensic Sciences
摘要： Infrared (IR) radiation comprises a beam located in the electromagnetic radiation family; it arises from the thermal vibrations of radiation that have longer wavelengths than visible light, but shorter wavelengths than microwave radiation. Its wavelength is between 750 nm and 1 mm. The amount of thermal IR radiation emitted by an object is associated with the temperature of the object, the surface area of the object and the spreading of light. IR-based technologies have been demonstrated as a method of evidence identification in forensic sciences in addition to many daily uses. The combination of IR-based spectrophotometry with several techniques ushered in a new era in crime scene investigations and the identification of evidence obtained from crime scenes. Furthermore, the use of IR-based photography techniques has significant advantages. IR fluorescent automated DNA sequencer and thermal analyser for deception detection are other techniques that take advantage of IR technology. In this chapter, we aimed to present the IR-based technologies used in forensic sciences and forensic photography techniques to define the current situation, the importance and the advantages of IR thermal imaging among these techniques, as well as to describe the operating principles of IR thermal imaging technologies that may be generated in the future based on this technique.
关键词： Spectrophotometry,Scene Investigation,Post-Mortem Interval,Thermal Imaging,Infrared
更新于2025-09-23 15:21:01
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Predictive equation for post-mortem interval using spectrophotometric values of post-mortem lividity: A pilot study
摘要： The colour of post-mortem lividity and control skin of 86 cadavers was measured spectrophotometrically to obtain L* (value), a* (chroma) and b* (hue) values. In addition, left heart blood (n = 58), right heart blood (n = 57) and blood from the femoral vein (n = 21) were measured. Using these data, we analysed the relationship between post-mortem lividity, control skin and blood colours. L* of post-mortem lividity (L* p) and control skin (L* c) were strongly correlated (r = 0.64). a* and b* of post-mortem lividity (a* p and b* p) significantly increased with an increasing post-mortem interval (PMI) but r2 values were low (0.11 and 0.070, respectively). Predictive equations for post-mortem lividity colour (L* p, a* p and b* p) were developed using control skin colour (L* c, a* c and b* c) and autopsy findings for the first time. The predictive equation for L* p explained almost 65% of the observed L* p. We created predictive equations for PMI with and without blood colour values, and the most accurate equation, which did not use blood colour values, made it possible to estimate PMI within ±10.29 h. Further study of these equations will help us to understand the factors that affect post-mortem lividity colour and increase the accuracy of equations for predicting post-mortem lividity colour and PMI.
关键词： Post-mortem interval,Spectrophotometry,Skin colour,Post-mortem lividity,Blood colour
更新于2025-09-19 17:15:36