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T1  - LED-Based Photoacoustic NO2 Sensor with a Sub-ppb Detection Limit 
SN  -  /  
UR  - http://hdl.handle.net/10138/335291 
T3  -  
A1  - Karhu, Juho; Hieta, Tuomas; Manoocheri, Farshid; Vainio, Markku; Ikonen, Erkki 
A2  -  
PB  -  
Y1  - 2021 
LA  - eng 
AB  - A high-sensitivity light-emitting diode (LED)-based photoacoustic NO2 sensor is demonstrated. Sensitive photoacoustic gas sensors based on incoherent light sources are typically limited by background noise and drifts due to a strong signal generated by light absorbed at the photoacoustic cell walls. Here, we reach a sub-ppb detection limit and excellent stability using cantilever-enhanced photoacoustic detection and perform a two-channel relative measurement. A white-light LED is used as a light... 
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IS  -  
SP  -  
OP  -  
KW  - photoacoustic spectroscopy; NO2; trace gas sensor; high sensitivity; light-emitting diode; NITROGEN-DIOXIDE; LEVEL DETECTION; QEPAS; 116 Chemical sciences 
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ER  -