scholarly journals Monolithic Double Resonator for Quartz Enhanced Photoacoustic Spectroscopy

2021 ◽  
Vol 11 (5) ◽  
pp. 2094
Author(s):  
Roman Rousseau ◽  
Diba Ayache ◽  
Nicolas Maurin ◽  
Wioletta Trzpil ◽  
Michael Bahriz ◽  
...  
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Distributed Feedback ◽  
Acoustic Excitation ◽  
Distributed Feedback Laser ◽  
Water Vapor Absorption ◽  
New Approach ◽  
Vapor Absorption ◽  
Printing Techniques

A new approach for Quartz Enhanced Photoacoustic Spectroscopy is presented, based on an acoustic excitation from the outside of the prongs of a quartz tuning fork, to increase the sensitivity of the sensor. For this purpose, we introduce a monolithic acoustic double-resonator (double-mR) in a T-shape configuration, using 3D printing. It was modelized and experimentally characterized using a 1392 nm distributed feedback laser diode, targeting a water vapor absorption line. The setup showed a two-factor enhancement of the signal, compared to a classical off-beam QEPAS approach and confirmed the strong interest of photolithographic printing techniques for acoustic developments.

A New Approach with Multiple Grooves for Miniaturization of Quartz Tuning Fork

2012 ◽  
Vol 14 (1) ◽  
pp. 18-22
Author(s):  
Kuei-Tien Liao ◽  
Chih-Hsiung Shen
Keyword(s):  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
New Approach

scholarly journals Application of Micro Quartz Tuning Fork in Trace Gas Sensing by Use of Quartz-Enhanced Photoacoustic Spectroscopy

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5240 ◽  
Author(s):  
Haoyang Lin ◽  
Zhao Huang ◽  
Ruifeng Kan ◽  
Huadan Zheng ◽  
Yihua Liu ◽  
...  
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Tuning Fork ◽  
Gas Sensing ◽  
Modulation Depth ◽  
Quartz Tuning Fork ◽  
Acoustic Resonance ◽  
Photoacoustic Signal ◽  
Integration Time ◽  
Sampling Volume ◽  
Qepas Sensor

A novel quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor based on a micro quartz tuning fork (QTF) is reported. As a photoacoustic transducer, a novel micro QTF was 3.7 times smaller than the usually used standard QTF, resulting in a gas sampling volume of ~0.1 mm3. As a proof of concept, water vapor in the air was detected by using 1.39 μm distributed feedback (DFB) laser. A detailed analysis of the performance of a QEPAS sensor based on the micro QTF was performed by detecting atmosphere H2O. The laser focus position and the laser modulation depth were optimized to improve the QEPAS excitation efficiency. A pair of acoustic micro resonators (AmRs) was assembled with the micro QTF in an on-beam configuration to enhance the photoacoustic signal. The AmRs geometry was optimized to amplify the acoustic resonance. With a 1 s integration time, a normalized noise equivalent absorption coefficient (NNEA) of 1.97 × 10−8 W·cm−1·Hz−1/2 was achieved when detecting H2O at less than 1 atm.

scholarly journals Quartz-Enhanced Photoacoustic Spectroscopy Sensor with a Small-Gap Quartz Tuning Fork

Sensors ◽  
2018 ◽  
Vol 18 (7) ◽  
pp. 2047 ◽  
Author(s):  
Yu-Fei Ma ◽  
Yao Tong ◽  
Ying He ◽  
Jin-Hu Long ◽  
Xin Yu
Keyword(s):  
Photoacoustic Spectroscopy ◽  
Tuning Fork ◽  
Quartz Tuning Fork

scholarly journals Dual Path Lock-In System for Elimination of Residual Amplitude Modulation and SNR Enhancement in Photoacoustic Spectroscopy

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4255 ◽  
Author(s):  
Qinduan Zhang ◽  
Jun Chang ◽  
Zhenhua Cong ◽  
Zongliang Wang ◽  
Fupeng Wang
Keyword(s):  
Amplitude Modulation ◽  
Photoacoustic Spectroscopy ◽  
Second Harmonic ◽  
Signal To Noise Ratio ◽  
Reference Signal ◽  
Distributed Feedback ◽  
Distributed Feedback Laser ◽  
Gas Concentration ◽  
Residual Amplitude Modulation ◽  
Lock In

A technique for elimination of residual amplitude modulation (ERAM) in photoacoustic spectroscopy based on dual path lock-in was proposed and experimentally demonstrated. There are two lock-in amplifiers, one is for gas concentration demodulation and another for residual amplitude modulation (RAM) measurement by tuning the reference signal in different phases, and then a dual path lock-in technique based on subtraction is applied to RAM removal, improving the second harmonic profile significantly. In this system, the signal to noise ratio (SNR) increases about two times based on our dual path lock-in technique compared to one distributed feedback laser diode (DFB-LD). The system achieved a good linear response (R-square = 0.99887) in a concentration range from 100 ppmv to 2400 ppmv and a minimum detection limit (MDL) of 1.47 ppmv.

Photoacoustic spectroscopy telemetry of airport dangerous goods

2019 ◽  
Vol 33 (02) ◽  
pp. 1950007
Author(s):  
Zhouqiang Zhang ◽  
Shuhai Jia ◽  
Guangshen Xu ◽  
Yabin Cao
Keyword(s):  
Absorption Coefficient ◽  
Diode Laser ◽  
Infrared Absorption ◽  
Photoacoustic Spectroscopy ◽  
Near Infrared ◽  
Tuning Fork ◽  
Laser Light ◽  
Quartz Tuning Fork ◽  
Dangerous Goods ◽  
Future Work

A novel photoacoustic spectroscopy telemetry method of detecting trace acetylene gas using a quartz tuning fork is reported. A 1532-nm CW-DFB, fiber-coupled diode laser with power of 12 mW was used as the excitation source while an astronomical telescope was used to collect laser light scattered on the surface of the detected object at a distance of 6 m and the photoacoustic spectroscopy of acetylene was performed. The detection results are consistent with the standard near-infrared absorption coefficient of acetylene. This study provides a new direction for research in photoacoustic spectroscopy telemetry. Future work will quantitatively analyze acetylene gas.

scholarly journals Accurate QTF Sensing Approach by Means of Narrow Band Spectral Estimation

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Graziella Scandurra ◽  
Gino Giusi ◽  
Carmine Ciofi
Keyword(s):  
Tuning Fork ◽  
Narrow Band ◽  
Spectral Estimation ◽  
Quartz Tuning Fork ◽  
Noise Spectrum ◽  
Operating Conditions ◽  
Single Measurement ◽  
New Approach ◽  
Tuning Forks ◽  
Noise Measurements

We propose a new approach for the extraction of the equivalent parameters of quartz tuning forks used as sensors by means of noise measurements. Noise is used as the test signal for the determination, by means of spectral analysis, of the frequency response of a circuit including the quartz tuning fork whose parameters need to be determined. A new approach for the analysis of strongly peaked noise spectra was developed in order to allow the correct measurement of the strongly peaked noise spectrum at the output of the system, which is the result of the high-quality factor of any quartz tuning fork-based sensor. With the approach we propose, the best compromise in terms of accuracy and measurement time can be obtained in a single measurement run. The performances of the approach we propose are discussed in comparison with those that can be obtained from a swept spectrum approach in the same operating conditions.

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