TT-NIRI™ Near-Infrared Test Module
07 Jan 2019
Application-specific software module for evaluating near-infrared lasers and LEDs
Near-infrared (near-IR or NIR) emissions of light are used by devices to sense three-dimensional objects outside of the human visible spectrum, eliminating visible light interference and human visual distraction. However, because NIR emissions are “invisible,” test equipment must be used to ensure adequate intensity and distribution of NIR light for object detection, as well as safe levels of radiant intensity for human exposure.
A comprehensive NIR test solution from Radiant combines the TT-NIRI application-specific software module with the Radiant NIR Intensity Lens solution to perform rapid, automated visual inspection of NIR emitters. Utilizing the Fourier optics of the NIR Intensity Lens solution, TT-NIRI evaluates all angular emissions of a source in a single image, as well as all dots in a structured light pattern created by diffractive optical elements (or DOE).
Comprehensive NIR Test Suite
Evaluating the accuracy of NIR emissions relies on radiometric measurements to determine the scope and intensity of NIR-emitting sources, as well as the angular position of precise emission points (dots) against defined tolerances. TT-NIRI provides a comprehensive NIR test suite that allows users to define measurement parameters and pass/fail criteria for specific points of interest in an image. The software module includes specific tests for NIR light source measurement including:
Angular Distribution of a Source
TT-NIRI includes a “Dot Source Analysis” test to output uniformity, max intensity, and flux statistics for each dot in a structured light pattern that is emitted by a NIR laser through a DOE. This test can analyze individual dots or regions of dots to ensure the patterns are projected in the correct angle (inclination, azimuth) and with the correct intensity (W/sr).
Close-up on the analysis of dot source emissions used for 3D sensing like facial or gesture recognition. Each dot in the pattern can be evaluated for accurate position and intensity, with data output including:
As with all modules of the TrueTest platform, tests from the TT-NIRI test library can be added to a sequence, and test parameters and pass/fail settings are input for each test. The entire sequence can be run end-to-end automatically and stored so multiple sequences can be created and recalled as needed. Individual test results are displayed and can be recorded in a report.