Open-path active remote sensing instrument

Fast and accurate spectral trace gas measurements using active spectroscopy

The Airyx open-path remote sensing instrument allows to monitor a wide range of atmospheric trace gases (NO2, SO2, O3, HCHO, HONO, H2O, BrO, OClO) based on the method of Differential Optical Absorption Spectroscopy (DOAS). Light emitted by High Power LEDs (centered at 280, 325, and 365 nm wavelength) covering the UV/vis range from 280 to 380 nm are coupled into a telescope and sent through the atmosphere along light paths of lengths between several 100 m and several km. Optionally, a high-power broadband light source (LDLS) is available extending the spectral range and the maximum measurement path length. The instrument measures the average concentration along the path with high precision (sub ppb range, depending on path length) and high time resolution (few seconds, depending on visibility). 

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Although the complex setup, the instrument is very easy to operate: Initial light path alignment is performed by the help of an internal field of view camera combined with precise motors. During operation, the software automatically monitors and optimizes the alignment ensuring constant high-quality measurement without relying on user input. The optional motorized telescope base enables automatized measurements on multiple light paths in different directions and/or heights. Calibration gases are not needed since trace gases are quantified along well-defined light paths using literature absorption data. Automated, frequent lamp reference measurements ensure drift-free, long-term operation at highest precision. 

Benefits & Innovation

  • High measurement accuracy  
    • Ultra-low stray light spectrometers 
    • Stable spectrometer temperatures, low noise 
    • Non-linear spectrometer characterization included 
    • Continuous measurement and automatic reference measurement 
    • Adaptable measurement routine 
  • Simple setup & operation  
    • Simple instrument setup and start up 
    • Automated path alignment and measurement routine including adjustment 
    • Low maintenance, easy cleaning of optics 
    • No calibration required; gas quantification based on spectral absorption data 
  • Long lifetime  
    • Waterproof with IP64, snow resistant 
    • Designed for long term operation 
    • Waterproof retro reflector array with changeable desiccant 
Typical limit of detection at 1000m path (one way), 10 second data averaging*tính trung bình dữ liệu  NO2  1.5 ppb  Achievable path lengths  100 m to 3000m (one way). SO  

500 m to 1500 m recommended. 

SO2  0.3 ppb 
O3  15 ppb  Time resolution / data averaging  Down to 3 seconds; adjustable temporal averaging improves sensitivity 
HCHO  4.5 ppb 
HONO  0.8 ppb 
Spectrometer specifications  Range:  270-380 nm  Measurement software  Included; Customizable measurement routine (time resolution, spectral averaging, multiple measurement paths) 
Ultra-low straylight configuration 
Detector Quantum efficiency  ~60% (back UV thinned detector)  Power consumption  < 70 W, 12 V 
Noise  10-4 at 1000 scans (~60 s int. time)  Additional sensors  Temperature, Pressure, Humidity 
Detectable gas species  NO2, SO2, O3, HCHO, HONO, H2O, BrO, OClO  Data analysis  Data analysis package provided for standard trace gases 
Light sources  High power LEDs centered at 280, 325 and 365 nm, optionally highpower broad band Xe lamp  Data communication  USB 2.0, Measurement PC (Notebook) included 
Temperature stabilization  Spectrometer and light sources are temperature stabilized  Retro reflectors  20 x 1” fused silica corner cube reflector array; IP64 housing 
Telescope specifications  Focal length:  800 mm  Weight & Dimension   
  Mirror diameter:  200 mm  Telescope  ca. 20 kg; ca. 100 x 35 x 32 cm3 
  Field of view:  ca. 0.05°  Analyzer  ca. 14 kg; ca. 40 x 44 x 13 cm3 
Path alignment  Camera + fiber bundle motors  Operation temperature range for telescope unit  -20°C to 40°C 
  Optional multi-path motors 
Fiber configuration  Sending  6 mono fibers  Telescope mounting options  Aluminum rail system or tripod 
Receiving  1 mono fiber 
UV fused silica multi-fiber bundle 
Lamp reference measurement  Automatic; Reference plate in front of fiber bundle  Mechanical stability  Robust for harsh environmental conditions (IP64) 

OPEN PATH DATA SHEET

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  • Spatially averaged trace gas measurement along light paths from several hundred meters to several kilometers 
  • Emission monitoring (e.g., SO2, NO2, HCHO) / Air quality monitoring 
  • Studies of atmospheric trace gas chemistry (e.g., O3, BrO, OClO), volcanic plume chemistry or polar halogen chemistry    
  • Traffic emission monitoring (SO2, NO2) at time resolution of few seconds 
  • Validation studies for satellite data, passive remote sensing, in situ and spatially high resolved chemistry modeling 

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