Sensor using a photo-acoustic absorption cell with two perpendicular acoustic resonators to analyze multiple molecules
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Tarih
2023
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Optica Publishing Group (formerly OSA)
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
An ultra-high sensitivity multi-molecule sensor based on a photo-acoustic cell with two perpendicular acoustic resonators and a common microphone has been reported. In this work, a 4.5 ?m distributed-feedback quantum cascade laser and a 1.5 ?mexternal cavity diode laser (EC-DL)were used as optical excitation sources. Considering the spectral ranges of the lasers used, it is possible to analyze eight molecules (QCL V N2Oand CO2, EC-DL:H2O, H2S, NH3, CO, CH4, and C2H2). The N2O molecule was used to evaluate the performance of the photo-acoustic spectroscopy (PAS)-based sensor. A sensitivity of 0.073 V/ppm and a linearity of 0.99 were found by analyzing the PAS signal as a function of N2O concentration at 2237.656 cm-1. The long-term performance of the sensor was determined by performing an Allan deviation analysis. A minimum detection limit of 9.8 ppb for 90 s integration time was achieved. The simultaneous multi-trace gas detection capability was verified by measurement of N2O, CO2, and H2O. Depending on the coarse/fine-tuning ranges of the lasers used, the number of molecules analyzed can be further increased. Such a sensor could provide simultaneous diagnosis of many diseases through an analysis of breath air and simultaneous monitoring of the most important greenhouse gases.
Açıklama
Anahtar Kelimeler
Acoustic Resonators, Ammonia, Carbon Dioxide, Diagnosis
Kaynak
Applied Optics
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
62
Sayı
25
