Low temperature properties of T shape photoacoustic cell and applications

A homemade low-temperature T shape photoacoustic system(PAS) in the range from 0 to-100 ℃ is well established.The mode distribution,the temperature dependence of the resonant frequency,Q-factor and the sensitivity of the PAS were investigated.The measurement of the carbon dioxide in the range from 0 to-100 ℃ showed that the system can be used in trace gas detection under low-temperature.The results show that the PAS can be used to study the atmospheric molecules continuous absorption at low-temperature.