Fingerprint Visualisation Apparatus with Residue-Collecting Receptacle
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Solution Overview
Problem
Existing methods for visualizing latent fingerprints using S2N2 vapour suffer from staining residues on the apparatus, making it difficult to monitor print development and maintain a clean environment.
Innovation Solution
An apparatus with a protruding receptacle and/or cartridge that generates a thermal gradient to collect polymerizing residue on the interior surface, reducing staining and allowing for efficient print visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If S2N2 vapour is used for developing latent fingerprints, then print visualization effectiveness is improved, but staining residue is generated on the apparatus surface
Solution Approach 1:
The harmful polymerizing residue is extracted from the general chamber environment and concentrated specifically on the receptacle or cartridge interior surface, where it can be easily removed without affecting the fingerprint visualization quality on the object
Solution Approach 2:
The receptacle or cartridge acts as an intermediary component that facilitates the chemical reaction between S2N2 vapour and fingerprint residues while containing the harmful polymerizing byproducts, separating the beneficial visualization function from the harmful staining effect
2Reliability
If traditional thermal pyrolysis method is used to generate S2N2, then high purity S2N2 is produced, but explosion risk increases due to friction sensitivity of S4N4
Solution Approach 1:
The patent employs a disposable cartridge containing the metal halide precursor, which is safely activated by heating to generate S2N2 vapour. The cartridge is then discarded after use, eliminating the need to handle or store large quantities of sensitive S4N4 or S2N2 materials in the apparatus, thereby reducing explosion risk while maintaining visualization effectiveness
Solution Approach 2:
The invention changes the physical state and chemical form of the precursor material from solid S4N4 (highly friction-sensitive) to a metal halide adduct that can be safely heated to decompose and release S2N2 vapour. This parameter change in the precursor material eliminates the friction sensitivity issue while maintaining the ability to generate high purity S2N2 for fingerprint visualization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus provides a cleaner environment for print development by collecting polymerizing residue on the receptacle or cartridge, enabling efficient and effective visualization of latent fingerprints on various surfaces, including those that have been tampered with or subjected to forces like wetting, heat, or friction.
Implementation Method 1
a first heating element for heating an agent to generate a vapour for developing a print on the object
Implementation Method 2
The protruding receptacle is arranged such that the first heating element is capable of generating a thermal gradient in the receptacle
Data Source
AI summary
The invention relates to an apparatus for the visualisation of a print on an object, the apparatus comprising: a base comprising a heating element in thermal communication with a receptacle for storing an agent, a housing to provide a sealed chamber; and a port for applying a vacuum to, or releasing a vacuum from, the sealed chamber. The invention is particularly for the visualisation of a fingerprint such as a latent fingerprint. The invention also relates to a system incorporating the apparatus with a cartridge and agent, and associated methods and uses for visualising a print on an object.