Calibration-free heterodyne phase-sensitive dispersion spectroscopy: quantitative gas sensing and recovery of absorption spectra DOI Creative Commons
Liuhao Ma, C. Zhou, Zhen Wang

и другие.

Optics Express, Год журнала: 2024, Номер 32(21), С. 37492 - 37492

Опубликована: Сен. 20, 2024

Heterodyne phase-sensitive dispersion spectroscopy (HPSDS) is a quantitative non-intrusive gas sensing technique based on the determination of refractive index target in vicinity an absorption transition. Since phase instead intensity probing laser light targeted, boasts advantage being normalization-free. It thus largely immune to fluctuations due either system instability or ambient interferences. Previous HPSDS-based sensors typically require calibration using standard mixtures establish look-up table between measured signal and concentrations, which both cumbersome problematic when there are significant compositional variations standards gas. In this work, we present robust generic that addresses issue with successful realization fully calibration-free measurements. Spectral-fitting entire spectra free variables related transition linecenter, broadening width, integrated absorbance were used eliminate effects unknown spectral coefficients. What believe be novel analytical model was proposed unify direct injection-current dithering-based HPSDS includes simultaneous frequency/intensity modulation, external electro-optic modulator (EOM) modulation-based non-ideal linear response EOM. The first validated via numerical experiment determine concentration recovery profiles. Actual experiments subsequently performed for measurement CH 4 near 1.65 µm, N 2 O 4.46 NO 5.26 collectively demonstrating capability near- mid-infrared lasers diverse modulation characteristics. Further demonstrations measure NH 3 concentrations at elevated temperatures through fitting multiple 9.06 µm. iterative spectral-fitting strategy accuracies confirm robustness (CF) sensing.

Язык: Английский

Highly sensitive CH4, C2H2 and CO simultaneous measurement LITES sensor based on multi-pass cell with overlapped spots pattern and QTFs with low resonant frequency DOI Creative Commons

Haiyue Sun,

Shunda Qiao, Ying He

и другие.

Optics Express, Год журнала: 2024, Номер 32(16), С. 28183 - 28183

Опубликована: Июль 12, 2024

This paper presents a simultaneous measurement light-induced thermoelectric spectroscopy (LITES) sensor with high sensitivity for detecting methane (CH

Язык: Английский

Процитировано

46
A novel tapered quartz tuning fork-based laser spectroscopy sensing DOI
Yufei Ma, Shunda Qiao, Rui Wang

и другие.

Applied Physics Reviews, Год журнала: 2024, Номер 11(4)

Опубликована: Окт. 23, 2024

A novel tapered quartz tuning fork (QTF) was designed to enhance its stress magnitude and charge distribution in QTF-based laser spectroscopy, which had a low resonant frequency of 7.83 kHz wide gap for long energy accumulation time easy optical alignment. Compared the reported rectangular QTF, this QTF transfers maximum position from root middle improve sensing performance. Furthermore, unique design eliminates 90° right angles typically found standard QTFs, often lead undesired “webs” “facets” during etching process. This minimizes performance degradation by reducing presence residual unexpected materials. spectroscopy quartz-enhanced photoacoustic (QEPAS) light-induced thermoelastic (LITES) were adopted verify with widely used total surface improved 5.08 times 5.69 QEPAS LITES simulations, respectively. Experiments revealed that sensor 3.02 improvement signal-to-noise-ratio (SNR) compared system. Adding an acoustic micro-resonator signal level 97.20 times. The minimum detection limit (MDL) acetylene (C2H2) determined be 16.45 ppbv. In technique, 3.60 SNR. MDL C2H2 146.39

Язык: Английский

Процитировано

45
High-sensitivity trace gas detection based on differential Helmholtz photoacoustic cell with dense spot pattern DOI Creative Commons
Chu Zhang, Ying He, Shunda Qiao

и другие.

Photoacoustics, Год журнала: 2024, Номер 38, С. 100634 - 100634

Опубликована: Июль 9, 2024

A high-sensitivity photoacoustic spectroscopy (PAS) sensor based on differential Helmholtz cell (DHPAC) with dense spot pattern is reported in this paper for the first time. multi-pass two concave mirrors was designed to achieve a pattern, which realized 212 times excitation of incident laser. finite element analysis utilized simulate sound field distribution and frequency response DHPAC. An erbium-doped fiber amplifier (EDFA) employed amplify output optical power laser strong excitation. In order assess sensor's performance, an acetylene (C

Язык: Английский

Процитировано

39
Disturbance-immune, fast response LITES gas sensor based on out-plane vibration mode employing micro Fabry-Perot cavity with heterodyne phase demodulation DOI

Ziting Lang,

Shunda Qiao, Ying He

и другие.

Sensors and Actuators B Chemical, Год журнала: 2024, Номер 419, С. 136412 - 136412

Опубликована: Авг. 3, 2024

Язык: Английский

Процитировано

36
Design of multipass cell with dense spot patterns and its performance in a light-induced thermoelastic spectroscopy-based methane sensor DOI
Yufei Ma, Yahui Liu, Ying He

и другие.

Deleted Journal, Год журнала: 2024, Номер 6(1), С. 1 - 1

Опубликована: Окт. 11, 2024

Язык: Английский

Процитировано

22
Multi-resonator T-type photoacoustic cell based photoacoustic spectroscopy gas sensor for simultaneous measurement C2H2, CH4 and CO2 DOI
Chu Zhang, Shunda Qiao, Ying He

и другие.

Sensors and Actuators B Chemical, Год журнала: 2024, Номер unknown, С. 137168 - 137168

Опубликована: Дек. 1, 2024

Язык: Английский

Процитировано

16
Quartz-Enhanced Photoacoustic Spectroscopy-Based Acetone and Ammonia Measurements from Human Breath Near 8 μm Wavelength Band DOI

Saran Kumar K,

Dinesh Jothimani,

Mullaiezhili Manoharan

и другие.

ACS Sensors, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Human breath gas analysis is a noninvasive disease diagnostic approach used to identify different pathological conditions in the human body. Monitoring acetone (C3H6O) and ammonia (NH3) as biomarkers vital diagnosing diabetes mellitus liver disorders, respectively. In this article, quartz-enhanced photoacoustic spectroscopy (QEPAS) technique proposed demonstrated for measuring C3H6O NH3 exhaled samples. We present QEPAS technique-based combined with broadband tunable quantum cascade laser (QCL) operating from 7.9 8.4 μm target both at specific absorption wavelengths. The experimental results show that minimum detection limits (MDLs) of 57 190 ppb were achieved NH3, measured samples collected volunteers. concentration measurements using 8 spectral region agreed blood glucose measurements. measurement limit sensitivity met requirement needed distinguish concentrations obtained healthy person those disorder conditions.

Язык: Английский

Процитировано

2
Sub-ppb level HCN photoacoustic sensor employing dual-tube resonator enhanced clamp-type tuning fork and U-net neural network noise filter DOI Creative Commons
Lihao Wang,

Haohua Lv,

Yaohong Zhao

и другие.

Photoacoustics, Год журнала: 2024, Номер 38, С. 100629 - 100629

Опубликована: Июнь 28, 2024

Hydrogen cyanide (HCN) is a toxic industrial chemical, necessitating low-level detection capabilities for safety and environmental monitoring. This study introduces novel approach detecting hydrogen using clamp-type custom quartz tuning fork (QTF) integrated with dual-tube acoustic micro-resonator (AmR) enhanced photoacoustic gas sensing. The design optimization of the AmR geometry were guided by theoretical simulation experimental validation, resulting in robust on-beam QEPAS (Quartz-Enhanced Photoacoustic Spectroscopy) configuration. To boost sensitivity, an Erbium-Doped Fiber Amplifier (EDFA) was incorporated, amplifying laser power approximately 286 times. Additionally, transformer-based U-shaped neural network, machine learning filter, employed to refine signal reduce background noise effectively. combination yielded significantly low limit HCN at 0.89 parts per billion (ppb) rapid response time 1 second, marking substantial advancement optical sensing technologies. Key modifications QTF innovative use lengths validated under various conditions, affirming system's real-time, high-sensitivity monitoring applications. work not only demonstrates significant enhancements but also highlights potential further technological advancements portable systems.

Язык: Английский

Процитировано

13
Ppb-Level Ammonia Sensor for Exhaled Breath Diagnosis Based on UV-DOAS Combined with Spectral Reconstruction Fitting Neural Network DOI
Rui Zhu,

Qiwen Zhou,

Qi Tian

и другие.

ACS Sensors, Год журнала: 2024, Номер 9(8), С. 4286 - 4294

Опубликована: Июль 30, 2024

Ammonia (NH3) in exhaled breath (EB) has been a biomarker for kidney function, and accurate measurement of NH3 is essential early screening disease. In this work, we report an optical sensor that combines ultraviolet differential absorption spectroscopy (UV-DOAS) spectral reconstruction fitting neural network (SRFNN) detecting EB. UV-DOAS introduced to eliminate interference from slow change the EB spectrum while proposed first time map original spectra onto sine function by principle least absolute deviations. The are then fitted least-squares method noise signals nitric oxide. Finally, built enable detection at parts per billion (ppb) level. laboratory results show range 9.50–12425.82 ppb, mean percentage error (MAPE) 0.83%, accuracy 0.42%. Experimental prove can detect identify simulated patients healthy people. Our will serve as new effective system with high stability medical field.

Язык: Английский

Процитировано

5
A dual‐resonance enhanced photoacoustic spectroscopy gas sensor based on a fiber optic cantilever beam microphone and a spherical photoacoustic cell DOI

Yongle Zhu,

Yuchen Guan,

Xu Jiang

и другие.

Microwave and Optical Technology Letters, Год журнала: 2024, Номер 66(5)

Опубликована: Май 1, 2024

Abstract We propose a novel high‐performance dual‐resonance enhanced photoacoustic spectroscopy (DRE‐PAS) gas sensor based on highly sensitive fiber optic cantilever beam microphone and high‐Q spherical cell (PAC). The first‐order resonant frequency (FORF) of the PAC is analyzed by finite element analysis to match FORF for double resonance enhancement signal. (PAS) system, including DRE‐PAS sensor, 1532.8 nm distributed feedback laser, high‐speed spectrometer, has been successfully exploited trace acetylene (C 2 H ) detection. experimental results show that limit detection (LOD) 106.8 parts‐per‐billion (ppb) with an integral time 1 s, LOD can be further reduced 11.03 ppb Allan‐Werle deviation 100 s time. normalized noise equivalent absorption coefficient obtained as 2.44 × 10 −8 cm −1 WHz −1/2 . reported superior characteristics signal enhancement, high sensitivity, strong antielectromagnetic interference capability, which provide new solution PAS development.

Язык: Английский

Процитировано

4