Gas
Sensor (TGS)
We are facing with a different type of
pollutants and gases in our circumstance , which
Causes environmental degradation, greenhouse effect,
ozone layer destruction and poisoning .
Sensor the device which be used for distinguish
these gases and chemicals since 1970 . In gas
Sensors industry
the signature technology is the
metal oxide semi conductor type gas sensor.
Taguchi gas sensor (TGS) is the most common one .
Operation Principle :
Metal oxide (generally SnO2) is a sensing material in TGS gas sensors .
When a metal oxidecrystal ( like
SnO2) is heated at high temperature in air, oxygen is adsorbed on the crystalsurface with a negative charge. “Then electrons in the surface are transferred to
the adsorbedoxygen, resulting in leaving positive charges in a
space charge layer”. Thus, surface potential is formed to serve as a potential barrier against
electron flow .(Figure 1).
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Figure 1. potential barrier
(in the absence of gases)
Figure 2. Model of
inter-grain potential barrier
(in the presence of gases)
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