How it works
Perform low-effort, efficient and reliable atmospheric observations with the Passive DOAS (Differential Optical Absorption Spectroscopy) method (according to VDI standard 4212).
The measurements provide information on the tropospheric and stratospheric concentration and distribution of various trace gases, e.g. NO₂, SO₂,formaldehyde, and aerosol optical depth. Also other high precision spectroscopic applications are possible like surface reflection spectroscopy.
The covered spectral range and resolution of the instruments can be customised and adapted to the needs of the user. With our long experience of several decades in spectroscopy we optimise spectrometer configurations and setups to achieve best possible measurements with highlight throughput and best achievable noise level. Besides the single spectrometer configuration we also offer a double spectrometer system to cover a larger spectral range with optimum spectral properties.
Typical applications
- Passive DOAS especially MAX (Multi Axis) – DOAS measurements of NO₂, SO₂, HCHO (and others)
- Direct Sun DOAS measurements, retrieval of stratospheric and tropospheric total columns of various gases
- Application on mobile platforms e.g. ships
- Air quality monitoring and trace gas measurements in urban, rural and pristine environments
- Emission plume studies of e.g. power plants, industrial complexes or volcanoes
- Total flux measurements of e.g. NO₂, SO₂, HCHO of power plants, industrial complexes, cities or volcanoes
- Scientific studies involving measurements of NO₂, SO₂, HCHO, HONO, H₂O, Glyoxal, BrO, IO, Ozone
Servicing
Contact us for servicing information.
Datasheet
Specifications
Measurement PC:
- MIN: External
- COMPACT: Embedded
- 1D: External
- 2D: External
Direct sun mode available:
- MINI: No
- COMPACT: No
- 1D: No
- 2D:Yes
Data communication:
- MINI: USB
- COMPACT: LAN / WiFi
- 1D: USB
- 2D: USB
Azimuth angle range and accuracy:
- MINI: Fixed
- COMPACT: Fixed
- 1D: Fixed
- 2D: -5° to 185°, ± 2°*5
Camera options*1:
- MINI: None or single
- COMPACT: None or single
- 1D: None, single or dual
- 2D: None, single or dual
Weight:
- MINI: ≈ 7 kg
- COMPACT: ≈ 7 kg
- 1D: ≈13 kg
- 2D: ≈ 14 kg
Size of telescope unit (WxDxH):
- MINI: Box*8: 30 x 20 x 13.2 cm³ Quartz tube length: 16 cm
- COMPACT: Box*8: 30 x 20 x 13.2cm³
- Quartz tube length: 16 cm
- 1D:Box*8: 20 x 20 x 13.2 cm3 Quartz tube: 16 cm
- 2D: Boxes*8: 20 x 20 x 29 cm3 Quartz tube: 16 cm
Telescope stand-alone possible:
- MINI: No
- COMPACT: No
- 1D: Yes *6
- 2D: Quartz tube: Yes *6
Size of spectrometer unit (WxDxH)
- MINI: embedded in telescope
- COMPACT:embedded in telescope
- 1D: Box*8: 40 x 30 x 13.2 cm³
- 2D: Box*8: 40 x 30 x 13.2 cm³
Operation temperature:
- MINI:-10°C to 40°C
- COMPACT: -10°C to 40°C
- 1D: -30°C to 50°C (telescope unit)
- 2D: -30°C to 50°C (telescope unit)
GPS option:
- MINI: Yes
- COMPACT: Yes
- 1D: No
- 2D: No
Calibration lamp options*2:
- MINI: External handheld lamp*3
- COMPACT: External handheld lamp*3
- 1D: Integrated and/or external handheld lamp *3
- 2D: Integrated and/or external handheld lamp *3
Spectrometers:
- MINI: Single
- COMPACT: Single
- 1D: Single or dual (UV and Vis)*7
- 2D: Single or dual (UV and Vis)*7
Typical spectral range:
- MINI: 300–460 nm *4
- COMPACT: 300–460 nm *4
- 1D: 300-405 nm (UV) and 420–565 nm (Vis) *4
- 2D: 300-405 nm (UV) and 420–565 nm (Vis) *4
Typical spectral resolution (FWHM):
- MINI: 0.6 nm *4
- COMPACT: 0.6 nm *4
- 1D: UV: 0.45 nm and 0.6 nm (Vis) *4
- 2D: UV: 0.45 nm and 0.6 nm (Vis) *4
Available detectors: back-thinned CCD or CMOS (back-thinned CCD highly recommended for UV)
Elevation angle range and accuracy: -10° to 190°, ± 0.2°(automatic adjustment with inclination sensor)
Field of view FWHM, Vertical x Horizontal: Scattered skylight: 0.3°x 1°, Direct sunlight (SkySpec2D with diffusor system only): 10° x 10°
Tripod & Adapter: Adapter for telescope and outdoor tripod*3
Power consumption: avg. <30 W (100 W max.), supply voltage 9-15 V, 110 – 220V AC power supply incl., operation with battery battery*1 possible
Housing material: Polycarbonate (IP64), UV resistant
Additional sensors: Ambient temperature, pressure, humidity in spectrometer housing, temperature on electronic board
*1 Wide field of view (≈90° vertical) cameras on telescope housing e.g. for monitoring of cloud conditions *2 Mercury (HG) gas lamp for spectrometer wavelength calibration check. Re-calibration typically not necessary due to stable in-house calibration. *3 Available accessory *4Customizable, contact Airyx for more information. *5Accuracy applies if azimuth is automatically calibrated from sun position *6Control over RS232, enables switching between devices and connection to arbitrary spectrometers *7 Two spectrometers improve spectral coverage without loss of spectral quality. *8 Size of cuboid main enclosure. Outsticking components like connectors, optical tube, coolers, cameras, etc. are not considered.
