SAN DIEGO Calif., July 6, 2016 – A new, turnkey system provides a powerful, direct means to measure headlamp illumination visibility to the standards recently developed by Insurance Institute for Highway Safety (IIHS). Specifically, the Optical Measurement System (OMS), part of the UDT Instruments Product Line of Gamma Scientific, integrates as many as 15 photodetectors with data acquisition hardware and signal processing hardware/software, to gauge headlamp illumination levels at multiple locations on a test track. When paired with vehicle position sensing electronics, the OMS delivers illuminance data from all the detectors as a function of vehicle location, and utilizes IIHS developed software to automatically compensate for vehicle pitch.
The unique ability of the OMS to closely reproduce the characteristics of the human visual system is a key factor in delivering high data accuracy. This includes color correction using Gamma Scientific’s proprietary photometric filters, which are integrated with the photodetectors. These reproduce the sensitivity of the human visual system providing accurate photometric results for tungsten, HID and LED headlamp systems. This is mated with a cosine diffuser to reduce the illuminance contribution from off-axis incidence angles, further improving accuracy. In addition, photodetector signals are conditioned so that any light source which pulses at above 35 Hz, such as LEDs, will appear to be continuous to the system, just as they do to the human eye.
Furthermore, the OMS offers superior absolute illuminance values because its sensors are calibrated to a NIST (National Institute of Standards and Technology) traceable, primary Illuminance Standard with the highest transfer accuracy currently available in the market (±1.75%).
The Optical Measurement System is self-contained and battery powered, and is provided in a compact enclosure mounted on a wheeled towing trailer for easy use and movement on a test track. System setup is performed either with a user supplied host computer or monitor/keyboard combination. Acquired test data can then be transferred out over a wifi connection, or stored on the system’s memory.
About Gamma Scientific:
With over 50 years of expertise in building high-performance light measurement instruments, Gamma Scientific is trusted by the world’s leading organizations to provide accurate results. Products include precision spectroradiometers, integrating spheres, calibration light sources and reflectance measurement equipment. Gamma Scientific also operates an ISO 17025, NVLAP accredited testing laboratory (NVLAP Laboratory code 200823-0) in San Diego, California.
Charles Sheets (Product Marketing Manager)