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Opus' remote sensing technology measures vehicle emissions from the roadside as drivers pass, capturing large datasets that can be used for a wide variety of testing, monitoring, evaluation and enforcement purposes.
Remote sensing measures real driving emissions as vehicles drive by in normal everyday driving conditions, using emission analyzers specially adapted for roadside use. Opus' remote sensing technology captures pollutant levels, licence plates, speed and acceleration to form a complete test record. Remote sensing devices (RSDs) can collect thousands of measurements a day and can be quickly and easily moved between locations for cost-effective emission monitoring.
Concentrations of Carbon Monoxide (CO), Hydrocarbons (HC), Oxides and Dioxides of Nitrogen (NO and NO2) and Particulate Matter (PM). The sensors detect emissions from tailpipe exhausts, as well as evaporative emissions caused by leaks from fuel lines, pumps, tanks and other components.
Remote sensing measurements are typically made as vehicles accelerate onto a highway, under moderate engine load and at moderate speed. The system shines beams of ultraviolet and infrared light across the road. The amount of specific wavelengths of light absorbed by the pollutant in the vehicle's exhaust and evaporative emissions is recorded and those readings enable us to determine the concentrations of pollutants present.
Opus provides remote sensing services in states across the U.S. and several European countries for a variety of purposes, including:
Our programs have collected more than 150 million valid inspection records since the 1990s. We have identified over 3.5 million clean vehicles that earned exemptions from their next periodic emission inspection and notified over 30,000 high emitters of the need to return for re-inspection. We have also evaluated entire vehicle fleets and inspection programs and surveilled certified vehicle models to detect manufacturer defeat devices.
Opus remote sensing services have met all industry performance standards for devices and applications since the mid-1990s. Our RSDs have consistently passed US standards, including the California Bureau of Automotive Repair (BAR) industry performance specification (On-Road Emission Measurement System; OREMS) and the Colorado On-road Vehicle Emission Remote Sensing (COVERS) specification - which has been recognized as the industry standard since the mid-2000s.
Remote sensing collects large quantities of on-road vehicle emission measurements, providing a large database of information that can be mined to: exempt low-emitters (saving motorists time and money by avoiding a station inspection, and focusing the remaining stations on inspecting the higher emitting vehicles); re-inspect high emitters early; assess the aggregate impact of the program; deter tampering; and surveil inspection stations, vehicle manufacturers and aftermarket control manufacturers.
Remote sensing can also be used in tandem with portable emission measuring systems (PEMS) - a mobile testing system designed to perform detailed tests on individual polluting vehicles. Remote sensing is used to screen highly polluting vehicle years, makes and model groups, which can then be verified with PEMS. The combination of Remote Sensing and PEMS provides a complete mobile solution for surveillance, enforcement and compliance.
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