Photoacoustic spectroscopy and light-induced thermoelastic spectroscopy based on inverted-triangular lithium niobate tuning fork
基于倒三角铌酸锂音叉的光声光谱和光诱导热弹性光谱
逆三角形リチウムニオブートンフォークに基づく光音響分光法と光誘起熱弾性分光法
역삼각형 리튬 나이오브레이트 튜닝 포크 기반의 광음향 분광법 및 빛 유도 열탄성 분광법
Espectroscopía fotoacústica y espectroscopía termoelástica inducida por luz basada en un tenedor de limón de litio triangular invertido
Spectroscopie photoacoustique et spectroscopie thermoélastique induite par la lumière basée sur un ciseau à niobate de lithium en forme de triangle inversé
Espectroscopía fotoacústica y espectroscopía termoelástica inducida por luz basada en una cuchara de cieno de niobato de litio en forma de triángulo invertido
Junjie Mu ¹ ², Guowei Han ³, Runqiu Wang ¹ ², Shunda Qiao 乔顺达 ¹ ², Ying He 何应 ¹ ², Yufei Ma 马欲飞 ¹ ²
¹ National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China
中国 哈尔滨 哈尔滨工业大学 激光空间信息全国重点实验室
² Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450008, China
中国 郑州 哈尔滨工业大学郑州高等研究院
³ Engineering Research Center for Semiconductor Integrated Technology, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
中国 北京 中国科学院半导体研究所 半导体集成技术工程研究中心
In this paper, a novel self-designed inverted-triangular lithium niobate tuning fork (LiNTF) was used to construct gas sensing system for the first time. The optimal ratio of the upper and lower boundaries of the inverted-triangular LiNTF is found by scanning through finite element analysis (FEA). The surface charge density and stress value of the inverted-triangular LiNTF are both higher than those of the standard quartz tuning fork (QTF).
In the lithium niobate-enhanced photoacoustic spectroscopy (LiNPAS) sensing system, the 2f peak and signal-to-noise ratio (SNR) of the inverted-triangular LiNTF are 7.41 times and 5.89 times those of the standard QTF, respectively. After forming acoustic standing wave field with the acoustic micro-resonator (AmR), the LiNPAS system achieves an SNR 56.16 times higher than without the AmR.
Based on Allan variance analysis, the system achieves a minimum detection limit (MDL) of 7.25 ppb with an averaging time of 800 seconds. In the light-induced thermoelastic spectroscopy (LITES) sensing system, the 2f peak and SNR of the inverted-triangular LiNTF are 7.82 times and 6.03 times those of the standard QTF, respectively. When the averaging time reaches 100 s, the MDL of the system is found to be 25.78 ppb.
