What is EDAR?
Emissions Detection And Reporting, commonly known as EDAR, is a new remote sensing technology invented and developed by Hager Environmental & Atmospheric Technologies. This technology is an eye safe laser-based technology capable of remotely detecting and measuring infrared absorption of environmentally critical gases coming out of a moving vehicle. EDAR contains a multi-patented system of hardware and software, which allows for a multi spectral 3-dimensional image of the entire exhaust plume of a moving vehicle. Additionally, EDAR provides an increased sensitivity, in some cases of over 2,000%, and resolutions of a million times greater versus existing technologies in use today.
EDAR’s technology is designed to collect data on various gases (CO, CO2, NOx, HC and PM) as part of an unmanned system. Since EDAR uses remote sensing technology, these units require only periodic maintenance and do not need to be calibrated, which allows EDAR units to operate as unmanned systems.
Utilizing the same footprint for light-duty and heavy-duty vehicles, EDAR is able to identify clean vehicles as well as high emitting vehicles. This technology also allows for remotely capturing and quantifying gases of vehicles on-road in a real world natural operating environment.
EDAR's R Accuracy
A “r squared” of one means perfect fit and an "r squared" of zero means no fit. EDAR's r-squares show excellent correlation and high linearity:
CO = 0.996
NO = 0.998
HC = 0.996
CH4 = 0.983
EDAR can Detect the Temperature of the Exhaust
EDAR has unique capabilities that other remote sensing technologies do not possess. Using infrared spectroscopic methods, EDAR is able to measure the temperature of the gases it can detect. For each vehicle, EDAR finds the exhaust plume at the location where it exits the tailpipe of the vehicle at the moment the plume becomes visible. This gives a reasonable measure of the temperature of the exiting exhaust gases. The temperature of the exhaust gases relative to the ambient temperature is an indication of if the vehicle is in a warmed-up condition, that is, not in cold start. If the vehicle were in cold start, it may have high emissions appearing to indicate the vehicle has an emissions problem. However, the EDAR unit can be used to identify these vehicles so they are not identified as false positive high emitters as opposed to the true high emitters.
EDAR Images the Entire Plume
The EDAR laser-based technology is combined with still/scene camera technology and a license plate recognition camera, all of which allows for the capture of not only a 2D image of the vehicle as it passes below the EDAR unit, but also a 3D multi spectral image of the entire exhaust plume and the identification of the subject vehicle. The 2D image allows for vehicle profiling, a benefit previously unavailable to existing remote testing technology, and only now available using EDAR technology.
A report is generated by EDAR for every vehicle detected and evaluated. EDAR captures a 2D image of the vehicle and plume as well as the license plate, date, time, speed, acceleration, temperature, barometric pressure, humidity, wind speed, a pass or fail indication, and an actual image of the vehicle itself.