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Atmospheric Sounder Spectrometer by Infrared Spectral

Atmospheric sounder

ASSIST II

The ASSIST-II is a field deployable sounder which uses Fourier Transform technology. It is the latest development in ground based atmospheric sounding spectrometer. Its configuration is rugged, compact and can be adapted to various environment, such as ground and sea platforms. Thanks to its advanced software suite, it can be operated 24/7 to provide atmospheric profiles of various components at high temporal and spectral resolution as well as a wide choice of other applications.

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High spectral resolution: down to 1 cm⁻¹
High temporal resolution
Wide bandwidth: covers the MWIR, LWIR ranges (3 – 19 μm)
Outstanding radiometric accuracy and instrument to instrument reproducibility

Atmospheric sounder

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Description

The ASSIST II is the field deployable sounder that the atmospheric community has been waiting for. It is the first product that includes a self-calibrating spectroradiometer, a network-enabled control software that can operate from anywhere in the world and an integrated data processing pipeline that generates in near real time the end products that you need, autonomously.

Publications:

ASSIST, Atmospheric Sounder Spectrometer for Infrared Spectral Technology: latest development and improvement in the atmospheric sounding technology

Technical Information

SPECIFICATIONSASSIST SERIES
Detector TypeHgCdTe (MCT), InSb detectors
Detector FormatSingle-Pixel
Spectral Range3 - 19 µm (Optional extended range from 2 to 25)
Spectral Resolution    1, 2, 4, 8, 16, 32, 64, 128 cm-1
Field of view (FOV)45 mrad
Measurement rate1 spectra/s (At finest spectral resolution)
Atmospheric profile rate0,5 profile/minute (At finest spectral resolution)
Typical NESR2.5 @ 1300 cm-1 nW/sr/cm2/cm-1
(At 16 cm-1 spectral resolution and 1s observation time)
0.25 @ 2000 cm-1 nW/sr/cm2/cm-1
(At 16 cm-1 spectral resolution and 1s observation time)
 
Dimensions90 x 79 x 50 cm (L x W x H ASSIST-II Instrument)
140 x 102 x 163 cm (L x W x H ASSIST-II Environmental Enclosure)
Weight80 kg
195 kg (Including the Environmental enclosure)
Power consumption< 300 W (ASSIST-II)
< 675 W (Including the Environmental Enclosure, AC On)
< 300 W (Including the Environmental Enclosure, AC Off)
Operational Temperature-30 oC to +40 oC (Including the Environmental Enclosure)

Michelson interferometer :

  • Spectral range: 500 to 5,000 cm-1 (Optional extended range from 400 to 5,000 cm-1)
  • Single plate KBr beamsplitter (self compensated);
  • Nominal beam diameter at beam stop: 2.54 cm.
  • Maximum beam divergence is 45 milliradians full angle;
  • Throughput: 0.00805 sr cm2
  • Spectral sampling: 0.5 cm-1;
  • HeNe laser metrology system (for digital sampling and mirror velocity control) mounted on pre-aligned assembly for easy replacement);
  • Sampling rate (laser fringe rate: 32khz to 100 kHz, computer selectable)

Offer 3 optimized scan speeds:

  • 32KHz (1.14 scan/sec.)
  • 50KHz (1.8 scans/sec.)
  • 100KHz (3.56 scan/sec.)

Mirror speed stability:

  • 5% rms at 100KHz
  • 1% rms at <50KHz
  • Communication interface:
  • Ethernet;

Calibration unit:

2 high emissivity blackbodies are permanently mounted on the ASSIST II. They are automatically selected according to the desired calibration sequence.

Blackbody:

Effective Emissivity>0.9998
Temperature Rangeambient to 70.00oC
Radiance uncertainty<±0.005 K
Temperature Display Resolution(as  per controller BC-231)
Temperature Stability0.005C° over 120 sec.
Temperature Gradient<0.35C
Temperature Setting Resolution 0.001C°
Temperature knowledge± 0.1 K° Absolute
Aperture diameter2,75 inch

Benefits & Features

Benefits

  • Works out of the box: Highly integrated hardware and software (Edgar) allows you to install your instrument virtually anywhere. Turn the instrument on and it will start sounding the atmosphere and send you relevant data!
  • Trust your results: End-to-end performance validated in the field by the scientific community
  • Manipulate less data: Produces atmospheric parameter profiles directly, not only interferograms or spectra
  • See further: Highest sensing performances available, using state-of-the-art technology and software algorithms
  • Use less manpower: True unattended 24/7 operation, with tools to help you keep track of its operation.
  • Work from anywhere: 100% remotely controllable

Features

  • Measures temperature, water vapor, O3 CO, CO2, CH4 and NOx vs altitude (Atmospheric profiles)
  • Generate temperature and moisture profile every 2 minutes (near real time)
  • High accuracy measurements for weather applications
  • High vertical resolution and high temporal resolution
  • Integrated and automatic radiometric calibration
  • Extensive instrument health monitoring
  • Network-centered architecture
  • Extensive remote monitoring for maintenance
  • Accepts additional user devices via the built-in USB, LVDS, and CameraLink interfaces
  • Rugged construction (field deployable)

Documentation