Gas mixing apparatus for automated gas sensor characterization

We developed a computer-controlled gas mixing system that provides automated test procedures for the characterization of gas sensors. The focus is the generation of trace gases (e.g. VOCs like benzene or naphthalene) using permeation furnaces and pre-dilution of test gases. With these methods, the sensor reaction can be analyzed at very low gas concentrations in the ppb range (parts per billion) and even lower. The pre-dilution setup enables to cover a high concentration range (1:62?500) within one test procedure. Up to six test gases, humidity, oxygen content, total flow and their variation over time can be controlled via a LabVIEW-based user-interface.

[1]  N. Bârsan,et al.  Conduction Model of Metal Oxide Gas Sensors , 2001 .

[2]  Accurate and adjustable calibration gas flow by switching permeation and diffusion devices , 2012 .

[3]  T. Malmström,et al.  A simple method for low-speed hot-wire anemometer calibration , 1998 .

[4]  Rotraut Merkle,et al.  Chemical diffusion of oxygen in tin dioxide: Effects of dopants and oxygen partial pressure , 2005 .

[5]  D. Knopf.  Continuous dynamic-gravimetric preparation of calibration gas mixtures for air pollution measurements , 2001 .

[6]  A. Schutze,et al.  Identification of organic solvents by a virtual multisensor system with hierarchical classification , 2004, IEEE Sensors Journal.

[7]  Gerhard Müller,et al.  Response mechanism of SiC-based MOS field-effect gas sensors , 2002 .

[8]  A. Spetz,et al.  Advances in SiC Field Effect Gas Sensors , 2004 .

[9]  Paul Verschure,et al.  The state of the art in biomimetics. , 2013, Bioinspiration & biomimetics.

[10]  A. Schutze,et al.  Detecting trace-level concentrations of volatile organic compounds with metal oxide gas sensors , 2013, 2013 IEEE SENSORS.

[11]  Mike Andersson,et al.  Detecting Volatile Organic Compounds in the ppb range with platinum-gate SiC-Field Effect Transistors , 2013, 2013 IEEE SENSORS.

[12]  A. Baldan,et al.  Atmosphere generation system for the preparation of ambient air volatile organic compound standard mixtures. , 1999, Analytical chemistry.

[13]  Hyun-U Ko,et al.  Disposable chemical sensors and biosensors made on cellulose paper , 2014, Nanotechnology.

[14]  B. Reedy,et al.  Temperature modulation in semiconductor gas sensing , 1999 .

[15]  Hildegard D. Jander,et al.  A test system for gas sensors , 1995 .