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n Document Verification

Visualant’s technology can be used to confirm whether the driver’s license, military identification, or birth certificate being presented to a law enforcement agent is authentic or a fake. It can be used as an authenticator to guard against and detect identity crime, forgery, counterfeiting, and other frauds.

It can embed a single, invisible small dot barcode carrying coded identity information on a security pass, passport, or shipping container. This new technology provides far more information than current barcode technology can deliver.

n The Technology: Up Close

Visualant’s patent-pending sensor technology turns conventional spectroscopy on its head. Rather than illuminating a specimen with broadband white light then using a prism and mirrors to separate wavelengths onto a large array of detectors, VSUL illuminates the specimen with multiple light emitting diodes (LEDs) sources each calibrated to individual narrowband spectra and measure the reflected light with a single detector eliminating the need for prisms and mirrors.


This technology allows VSUL to produce industry-specific, portable, robust spectral analysis tools that are inexpensive, extremely small, and do not require constant calibration.

The simplest of the current sensors contains a single photodiode light sensor and multiple surface-mount (LEDs) that project different spectra of light. In the simplest driving scheme, the LEDs are turned on, one at a time to project light onto a specimen. The specimen reflects a portion of the light back to the photodiode of the sensor which converts the light energy to an output voltage level—essentially taking a snapshot of the specimen for each LED. The photodiode voltage levels form a spectral signature for the specimen which is then recorded to a small file.

The sensor collects a spectral signature of a paint sample and sends data to a host computer. The software interface on the computer can be navigated with a mouse or with verbal commands captured with speech recognition algorithms—enabling hands-free control of the device for a user in the field. The sensor acquires multiple spectral signatures per second, and plots them in real time on the screen for the user. A set of proprietary algorithms compares the spectral signature to a database of known signatures, and quantifies the closeness of the match. FOr example, the specimen is identified as paint sample W-F-720 and the signatures are a 99.682% match. New items can be added to the database on the fly. The database can be stored locally in a mobile device, on a nearby computer, or on a remote server. Proprietary encryption algorithms are used to transmit spectral signatures to a remote server.


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