Current hydrogen monitoring sensors may determine hydrogen concentration by measurements of thermal conductivity and can have a measurement range limited to concentrations of less than 50%. The sensors are also relatively expensive and can exhibit cross sensitivity to other gases which can be a problem in the measurement of hydrogen-natural gas mixtures because of the complex makeup of natural gas.
UW Madison researchers have developed a simple, low-cost hydrogen sensor that can work in a mixed gas environment to provide a wide measurement range. The robust gas sensor works by interrogating a limited frequency range and using polarization for baseline correction of low-amplitude Raman scattering shifts unique to particular gases.