Opus AccuScan™ Remote Sensing Devices (RSD) remotely measure exhaust emissions from motor vehicles as they are driven past the remote sensing device on streets and highways. The emissions are measured spectroscopically by casting a narrow infrared (IR) and ultraviolet (UV) beam of light across the road and through the trailing exhaust of passing motor vehicles. A mirror then reflects the IR/UV light back to a series of detectors that measure the amount of transmitted light at characteristic wavelengths absorbed by the pollutants of interest.



The RSD can measure the emissions of vehicles circulating under real driving conditions. Since it takes only a second to capture a measurement, these devices can capture large quantities of vehicle emissions data in a short period of time.


Also, since it is a non-intrusive technique, the RSD audits the circulating vehicles without interfering with the traffic flow, therefore it can audit an entire city's fleet in a short period and with no impact on daily operations.


The RSDs can measure the traffic emissions remotely, without the vehicles having to stop to be audited.

"a revolution: exhaust emissions are measured instantly, accurately and non intrusively"

The RSD (Remote Sensing Device) is the only technology able to measure massively all traffic emissions (CO, CO2, HC, NOx, PM) as well as provide kinetic conditions and license plate picture of every vehicle driving by, all non-intrusively and instantly.

no competition

The RSD technology is unique and protected worldwide by patents.


Very attractive returns once applied the guidelines after the studies.

real data

Real emissions data for any individual vehicle.

It does not relies on projections or models.


RSD correlate with other analytical devices such as PEMS and OBS by 85-95%.


High emitting vehicles must to be individually identified since 5% of the fleet contributes with over 50% of total emission.

closing the gap

Current emission control is not performed under real driving conditions, not even tested for NOx or HC.


quick checks

Vehicles are measured continuously within 0.6 seconds; not only in the periodical statutory emission tests.


Practical, quick to deploy at strategic locations (mobile units), intuitive and very easy to operate.

worldwide recognition

The efficiency and versatility of remote sensing has been recognised by numerous scientific bodies, including the US-EPA, who has published three guides recognizing the benefits of the technology.


Opus RSE is adding value continuously to the technology by operating it under ISO Standards and working with the Spanish Government creating legislation among others.


Awards & Recognition +

history of rsd

Since 1989, ARB (California Air Resources Board) has sponsored several research studies that employed RSDs to measure on-road vehicle emissions at several California locations.

Those studies, carried out by Dr. Donald Stedman, Dr. Gary Bishop, and their team with the University of Denver (DU), started with CO measurement, with VOC, NO measurements an additional capabilities added over the years.


Learn more about RSD history +

how does it work?

The Remote Sensing Device (RSD) is able to measure vehicles emissions circulating under real driving conditions. It is a mobile system that can be deployed easily in strategical locations as required.

The RSD detects and measures vehicle emissions as the vehicle drives by. The process of measuring emissions remotely begins when the vehicle breaks the infrared (IR) and ultraviolet (UV) beam sent across and back a single lane road from the Source/Detector Module (SDM) to a Corner Cube Mirror (CCM).

Since it can obtain a complete record in less than a second, these devices are designed to obtain large quantities of data. This generates a sufficient amount of reliable information to be extrapolated to the entire fleet. Also, since it is a non-intrusive technique, the RSD audits circulating vehicles without interfering with the traffic flow.

"The entire process is COMPLETED in less than 1 SEC"

Due to the RSD is a mobile system, no special requirements are needed for setting it up on the road sides. Besides, RSD deployment is very simple and agile due to the minimal amount of components required to operate the system.

Main key components of the RSD are:


  • Emissions module (SDM + CCM)
  • Kinetic module (Speed/Accel Bar)
  • CCTV Camera
  • Weather Station module

For awareness campaigns, our Smart Sign is connected in order to display any information required to inform the drivers as they pass by the emissions detector


The RSD technology is an effective response to the need of improving the air quality in the European cities.


Big European cities are facing huge problems in terms of air quality. The on road traffic is the responsible of most of the emissions in the cities. It is proved that a small amount of vehicles (<10%), no matter the age or type, are responsible of a huge percentage of the total road emissions and by acting only on them, savings of millions of euros could be achieved.


The RSD Technology operated by Opus RSE is the best solution to attack these negative impacts provinding additional strategic advantages such as:


Improving air quality reducing the on road traffic emissions by monitoring & controlling their evolution with time.


Low budget implementation, savings in fuel consumption and EU penalties, public spending reduction and possible source of incomes.


Improving the air and quality of life, environmental awareness-raising and citizenship education.


Actions viewed favourably by the International Authorities in regards to global commitments on emissions reduction and air quality.