Fingermark Lifting Device with Fluorescent Indicator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fingermark lifting devices have limited sensitivity and selectivity for glandular secretions, struggle with detecting older marks, and are unsuitable for covert operations due to the need for visible developers that leave residues, especially on reflective, patterned, luminescent, reactive, textured, and porous substrates.
Innovation Solution
A fingermark lifting and visualization device with a carrier having a lifting surface and an immobilized indicator that changes color or fluorescence in response to glandular secretions, eliminating the need for developers and capable of detecting invisible fingermarks on various substrates, including those that interfere with common detection techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional developers (powders or liquids) are used to visualize invisible fingermarks, then the fingermarks become visible for detection, but residues are left on the substrate which interferes with covert operations and complicates evidence preservation
Solution Approach 1:
The patent replaces traditional mechanical/chemical developers (powders, liquids) with a fluorescent indicator system that chemically binds to glandular secretions. The fluorescent marker provides visualization through fluorescence excitation rather than physical residue deposition, eliminating the harmful residue effect while maintaining detection capability.
Solution Approach 2:
The patent employs fluorescent indicators that exhibit color/fluorescence changes when bound to glandular secretions. This optical property change enables fingermark visualization without leaving visible residues, as the fluorescence is excited by specific wavelengths and emits at different wavelengths, creating a non-contactable visualization method.
2Measurement precision
If advanced detection techniques (vacuum metal deposition, FTIR hyperspectral imaging) are used to detect fingermarks, then detection sensitivity is improved, but device complexity and equipment availability become limiting factors
Solution Approach 1:
The patent makes the substrate (lifting device) itself serve as the detection medium by incorporating fluorescent indicators directly into the lifting material. This eliminates the need for complex external detection equipment, as the lifting device automatically provides both the lifting function and the fluorescent visualization capability through direct contact with glandular secretions.
Solution Approach 2:
The patent creates a multi-functional lifting device that combines fingermark lifting, chemical binding to secretions, and fluorescent visualization in a single tool. This universal device replaces multiple separate systems (lifting tapes, chemical developers, sophisticated imaging equipment) with one integrated solution that is widely accessible.
3Adaptability or versatility
If traditional lifting devices are used on reflective, patterned, luminescent, reactive, textured, or porous substrates, then lifting capability is reduced, but the device cannot effectively detect fingermarks on these common surfaces
Solution Approach 1:
The patent employs composite lifting materials that combine adhesive properties with fluorescent indicator compounds. This composite structure allows the device to adhere to diverse substrates (reflective, patterned, textured, porous surfaces) while simultaneously providing fluorescent visualization through the indicator component, maintaining detection quality across varied surface types.
Solution Approach 2:
The patent applies fluorescent indicators specifically to the regions where glandular secretions are transferred during fingerprint formation. This localized chemical binding ensures high-precision detection regardless of substrate properties, as the fluorescence occurs only where secretions are present, adapting to any surface characteristics.
4Measurement precision
If visible developers are used for fingermark detection, then detection capability is achieved, but the method is unsuitable for covert operations where leaving residues is unacceptable
Solution Approach 1:
The patent uses fluorescent indicators that are invisible under normal lighting conditions but emit fluorescence when excited by specific wavelengths. This allows covert detection operations where the detection method itself remains invisible, as the fluorescence only appears under controlled excitation conditions, not in normal ambient light.
Solution Approach 2:
The patent replaces visible chemical developers with a fluorescent detection system that operates through optical excitation rather than visible chemical reactions. This substitution eliminates the visibility of the detection process in normal conditions, enabling covert operations while maintaining high detection precision through fluorescence imaging.
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 device effectively visualizes at least 12 points in a fingermark, maintains stability for extended periods, and is suitable for field use, including covert operations without leaving residues, demonstrating improved sensitivity and adaptability across diverse substrates.
Implementation Method 1
The indicator changes color or changes in fluorescence in the visible spectrum in response to contact with a glandular secretion
Implementation Method 2
The indicator changes color or changes in fluorescence in the visible spectrum in response to contact with a glandular secretion
Implementation Method 3
A fingermark lifter may be a specialized device, such as a gel lifter (a card with gelatin on its surface), or may be a clear adhesive substance, such as fingermark lifting tape
Data Source
AI summary
A fingermark lifting and visualization device includes a carrier and an indicator. The carrier has a lifting surface. The indicator is immobilized on the lifting surface. The indicator changes color or changes in fluorescence in the visible spectrum in response to contact with a glandular secretion.