Aurora 4000

Polar Integrating Nephelometer

Aerosol particles in the atmosphere directly influence the Earth’s radiative balance by absorbing and scattering the solar radiation and indirectly, by changing the microphysical properties of clouds. Aurora 4000, the world’s first commercially available polar nephelometer, provides measurements of integrated light scattering between 10°- 90° and 180°, with the user able to select up to 18 separate angles between the 10° to 90° starting angle of the integration.

Features

Wide Range

Wide measurement range (0.1 to 20,000 Mm-1)

Broad backscatter shutter positioning

18 angular sectors; fully-integrated scattering, as well as integrated scattering of up to 17 different angular sectors from 10˚ to 90˚ through to 170˚

Customised data analysis

Raw measurement counts available for customised data analysis

Functional flexibility

Mass flow control option enables flow to be controlled in conjunction with an external pump

In-built safety

An automatic bypass ball valve option protects against contamination of a common sampling manifold during calibration

Total package

Fully integrated package including internal sample pump, sample heater, internal calibration valves, zero air pump & data logger

See our technology in action

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Resources

Aurora Integrating Nephelometers
Brochure

Aurora 4000
Technical Specifications

Aurora 4000
User Manual

The technology behind the insight / Class-leading technology

The Aurora™ 4000 builds on the same three wavelength capabilities as the Aurora™ 3000. It provides measurements of light scattering up to 18 user-selectable angular sectors, using varied backscatter shutter positioning. It can simultaneously measure at 450 nm (blue), 525 nm (green) and 635 nm (red), using the proven LED light source (Müller et al., AMT, 2011), to enable wide and in-depth analysis of the interaction between light and aerosols. This can help determine the phase function of aerosols, which is crucial to climate research and modelling.

Despite its advanced features, the Aurora™ 4000 maintains the same ease of use, maintenance and calibration as the rest of the Aurora™ range.

Measuring scattering by angular sector

The Aurora™ 4000 builds on the same three wavelength capabilities as the Aurora™ 3000. The polar nephelometer is unique in that it has a backscatter shutter that can be set to any angle between 100 through to 900 at up to 17 different positions. This can help determine the phase function of aerosols, which is crucial to climate research and modelling.

Accurate phase function

Despite its advanced features, the Aurora™ 4000 maintains the same ease of use, maintenance and calibration as the rest of the Aurora™ range. It can simultaneously measure at 450 nm (blue), 525 nm (green) and 635 nm (red), using the proven LED light source (Müller et al., AMT, 2011), to enable wide and in-depth analysis of the interaction between light and aerosols. These measurements contribute to determining the phase function, a key parameter to accurately model the influence of the aerosol scattering on the Earth’s radiative balance.

Benefits

High powered multi-wavelength LED light-source increases measurement accuracy
Higher flow available via the external pump & MFC option
Raw measurement counts available for customised data analysis
An automated ball value inlet bypass option available for use with common inlet manifolds
Simplified fully automatic & scheduled calibration (zero & /or span) using internal valves, ideal for remote locations
Robust instrument for unattended operation
12 VDC operation (60 W maximum, 15 W nominal)
Automatic optical reference calibration
Fully integrated package including internal sample pump, sample heater, internal calibration valves, zero air pump & data logger
Internal sample heater with temperature or RH control, which can be enabled by the user to eliminate the effects of humidity (RH: < 30 to < 90 %)
Our LED light source is guaranteed not to fail within 3 years & often exceeds 5 years life time
Heat generated by the LED light source is a fraction of that generated by a flash lamp, minimising changes in sample RH
LEDs emit light at a specific wavelength eliminating the need for band pass filters
An LED light source uses the same light path for each wavelength ensuring consistency of measurement, eliminating the need for multiple PMTs & maximising light intensity
Remote Control through serial interface
Easily integrates into the Acoem Aerosol Conditioning System ACS 1000.

Applications

Aurora TM integrating nephelometers measure the light scattering coefficient of ambient aerosol particles with high sensitivity and time resoltuion, in a wide range of monitoring and research application, related to air pollution and climate.

Our business cases

Ambient Air Fence Line Application casestudy

Monitoring for the environment & preserving history casestudy

World-class aerosol monitoring & measurement

Aurora™ range of integrating nephelometers are an ideal solution for helping us identify, understand and plan ways to control pollution, and the imbalance and degradation of the environment. They are the instruments of choice of governments and Environmental Protection Authorities (EPAs) around the world for visibility applications. Moreover, its simplified automatic calibration with internal valves makes it ideal for remote as well as high altitude locations.

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