Off-Beam Acoustic Micro-Resonator for QEPAS Sensor with a Custom Quartz Tuning Fork

Atmosphere, Journal Year: 2025, Volume and Issue: 16(3), P. 352 - 352

Published: March 20, 2025

Quartz-enhanced photoacoustic spectroscopy (QEPAS) has shown great promise for monitoring greenhouse gases and pollutants with a high measurement accuracy limit of detection. A QEPAS sensor, which can achieve signal gain without requiring the laser beam to pass through two prongs quartz tuning fork (QTF), is reported. custom QTF resonant frequency 7.2 kHz quality factor 8406 was employed as sound detection element, parameters acoustic micro-resonator (AmR) in off-beam spectrophone were optimized. signal-to-noise ratio (SNR) 16 achieved based on optimal AmR dimensions compared bare QTF. Water vapor (H2O) detected utilizing sensor equipped spectrophone, achieving minimum (MDL) 4 ppm normalized noise equivalent absorption coefficient (NNEA) 5.7 × 10−8 cm−1·W·Hz−1/2 at an integration time 300 ms.

Language: Английский

Development of Gas Sensors for Measuring Gas Emission and Diffusion Coefficient in Gas Charged EPDM Polymer Using Volumetric and Manometric Analysis

Korean Journal of Materials Research, Journal Year: 2025, Volume and Issue: 35(3), P. 127 - 138

Published: March 27, 2025

Language: Английский