![]() ![]() Optical CO gas sensor using a cobalt oxide thin film prepared by pulsed laser deposition under various argon pressures. Sensitive methane detection based on quartz-enhanced photoacoustic spectroscopy with a high-power diode laser and wavelet filtering. ![]() Crystalline structure, defects and gas sensor response to NO2 and H2S of tungsten trioxide nanopowders. We compare experimental and finite element modeling of the vibration amplitude of tip-loaded quartz tuning forks. Jiménez I., Arbiol J., Dezanneau G., Cornet A., Morante J.R. ![]() Nano-sized PdO loaded SnO2 nanoparticles by reverse micelle method for highly sensitive CO gas sensor. Yuasa M., Masaki T., Kida T., Shimanoe K., Yamazoe N. Low temperature CO and CH4 dual selective gas sensor using SnO2 quantum dots prepared by sonochemical method. Further improvement methods for such technique is proposed.Īcoustic wave sensing Indirect demodulation Photothermal spectroscopy Quartz tuning fork. We develop a highly sensitive torque differential magnetometry using the qPlus mode of a quartz tuning fork. Because of its high quality factor, a quartz tuning fork can also be used for high-sensitivity magnetometry. Each tuning fork has two electrical leads for connection to a driving oscillator such as the Mad City Labs MadPLL®instant AFM and nanoprobe instrumentation. A quartz tuning fork is the key component of high-resolution atomic force microscope. The measured results indicate that this technique had an enhanced signal-to-noise ratio (SNR) of 1.36 times when compared to the traditional QEPTS. Mad City Labs offers quartz crystal tuning forks for scanning probe microscopy applications such as atomic force microscopy (AFM) and near-field scanning optical microscopy (NSOM). A model of sound field produced by the first QTF vibrating is established by finite element method to explain the variation trend of signal and noise in the second QTF. For our tun-ing fork: L 2.809 mm, W 0.127 mm and D 0.325 mm. The electrode wires and the vacuum canister are not shown. of Low Figure 1: Rough geometry of our quartz crys-tal tuning fork. Acetylene (C 2H 2) with a volume concentration of 1.95 % is selected as the target gas. al., Quartz tuning fork: thermometer, pressure- and vis-cometer for helium liquids, J. Four different sensing configurations are designed and verified. This indirect demodulation by acoustic wave sensing can avoid QTF being irradiated by laser beam and therefore get less noise and realize better detection sensitivity. Different from traditional QEPTS, the method proposed in this paper utilizes the second QTF to sense acoustic wave produced by the first QTF owing to the vibration resulted from photo-thermo-elastic effect. A gas sensing method based on quartz-enhanced photothermal spectroscopy (QEPTS) demodulated by quartz tuning fork (QTF) sensing acoustic wave is reported for the first time. ![]()
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