Spectrometers-Monochromators-and-Light-Sources-from-Vacuum-Ultra-Violet-VUV-to-Visible-Vis-Resonance-Ltd-logo-clearbackground-resonanceltd 2-min

GCSO2-1 Gas Camera


The Resonance GCSO2-1 is a UV-sensitive camera that compares images in two spectral bands to produce concentration maps of SO2 plumes. This method is based on differential optical absorption spectroscopy (DOAS) methodology for remote sensing of atmospheric gases (Refs 1-12). GCSO2-1 has been under development since 2008 and the GC-SO2-1 is an elegant implementation of the method that has several unique features. It employs a single back-thinned CMOS camera, which simultaneously captures two images of the target plume in bands centered on 310 and 320 nm. Offsets due to changes between two imaging chips or moving filters are eliminated. The two images are mirrored about the optical axis of the camera, which eliminates distortion and edge dimming. A complete calibration is obtained by use of a PC-controlled SO2 gas cell wheel. Modeling and measurements show that the concentration maps from GCSO2-1 are highly specific to SO2 and are insensitive to changes in the spectrum of daylight due to solar elevation.

  • Product images
  • Volcano Images
  • Stack Images
remote sensor-gas camera-GCSO2-1-05-Resonance-min


Produces quantitative images of SO2 in plumes from volcanoes and stacks that can be used to determine SO2-mass fluxes in tonnes/day

Captures simultaneous images at 310 and 320 NM

Single UV lens for image stability

Distortion control with mirrors to cancel pincushion and barrel distortion

Calibration using COSPEC SO2 cells

Automatic dark subtraction

Uses Ratio-of-Ratios technique for calibrated ppm-m 3D image

Manual alignment adjustment through rear access port

Connects to control laptop computer via ethernet

Powers off of external battery, DC or AC power


Sensitivity for SO2

Detection Method





Field of View


~20 ppm-m​

Back-thinned CMOS



284 - 182 - 188mm

63 lp/mm (center

12.5 x 16 degrees

LabVIEW based Software​