Mapping of Low Dissolved CO2

CO2 Sensor Foil SF-CD2R

The SF-CD2R can be attached to any sample surface or inner surface of any transparent glass or plastic vessels. Images of CO2 distributions over whole sample areas are then recorded contactless with the VisiSens™ detector unit DU03 or VisiSens TD. The sensor foil is for measurement in liquids or samples with a constant relative humidity and measures the low CO2 range of 0 – 1 %.

  • 2D read-out
  • Contactless, direct sensing or through transparent walls
  • Visualize spatial and temporal gradients
  • Numerous measurement points in one image
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O2, pH and CO2 Mapping in Sediments

O2, pH, and CO2 are key factors for microbial activity and various geochemical processes in sediments. They highly vary locally, e.g. at interfaces or different depths. Spatial and temporal analyte dynamics over long time periods can be visualized. Various regions can be compared within one measurement. VisiSens enables non-invasive 2D-mapping over cross-sections or on sample surfaces. The portable device can be used in lab and field.

Spatial and Temporal Analyte Changes in Plants & Soil

O2, pH and CO2 play a crucial role in plant and soil processes, e. g. in photosynthesis, respiration, in rhizospheres or in microbiological processes. Metabolic processes can be monitored. This planar optical sensor technique allows non-invasive read-out through glass walls of rhizotrons. Studying metabolic activity of roots and determining the cultivation optimum is important for sustainable agriculture, e. g. for adjustment of water and fertilizer supply.

Non-invasive 2D Analyte Mapping in Microfluidics

VisiSens™ enables 2D visualization of important culture parameters inside microfluidic chips. You can continuously monitor in 2D, with high resolution at specific positions or over the whole chip surface in a non-contact readout mode. Detect metabolic hotspots, record time-series, and monitor hypoxia, cellular growth, or O2 supply inside the chip. You can gain new insights on metabolic activity and natural or artificially produced gradients.


# VisiSens™ is no approved medical device
*typical data which may strongly differ with adapting the imaging set-up to specific needs
** typical data of precision of a defined ROI (> 6,000 pixels) over time at 20 °C, excluded ambient light, FoV 8 cm x 6 cm, DU03 strongly differs
*** typcial data of spatial standard deviation in defined ROI > 6,000 pixels at 20 °C, excluded ambient light, FoV 8 cm x 6 cm, DU03 strongly differs
Measurement range 0 - 1 % pCO2 at atmospheric pressure (1013.15 hPa)
Response time (t90)* < 3 min.
Specifications using VisiSens TD read-out
Precision (temporal)***

± 0.02 % CO2 at 2.0 % CO2
± 0.01 % CO2 at 25.0 % CO2

Precision (spatial)**** ± 0.2 % CO2 at 2.0 % CO2
± 1.2 % CO2 at 25.0 % CO2
Compatibility Aqueous solutions, pH 4 - 9
General sensor temperature working range from + 5 to + 45 °C
Size of sensor foil Standard 40 x 40 mm2
min. 5 x 5 mm2

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