Doubly resonant sub-ppt photoacoustic gas detection with eight decades dynamic range

Photoacoustics, Journal Year: 2022, Volume and Issue: 27, P. 100387 - 100387

Published: July 22, 2022

Photoacoustic spectroscopy (PAS) based gas sensors with high sensitivity, wide dynamic range, low cost, and small footprint are desirable in energy, environment, safety, public health. However, most works have focused on either acoustic resonator to enhance wave or optical wave. Herein, we develop a sensor doubly resonant PAS which the waves simultaneously enhanced using combined resonators centimeter-long configuration. Not only lower detection limit is by double standing waves, but also upper expanded due short resonators. As an example, developed detecting acetylene (C2H2), achieving noise equivalent absorption of 5.7 × 10-13 cm-1 range eight orders. Compared state-of-the-art sensors, achieves record sensitivity range.

Language: Английский

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Upconversion time-stretch infrared spectroscopy

Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)

Published: March 4, 2023

High-speed measurement confronts the extreme speed limit when signal becomes comparable to noise level. In context of broadband mid-infrared spectroscopy, state-of-the-art ultrafast Fourier-transform infrared spectrometers, in particular dual-comb have improved rate up a few MSpectra s

Language: Английский

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Quartz-enhanced photoacoustic spectroscopy sensing using trapezoidal- and round-head quartz tuning forks

Optics Letters, Journal Year: 2024, Volume and Issue: 49(3), P. 770 - 770

Published: Jan. 2, 2024

In this Letter, two novel, to the best of our knowledge, quartz tuning forks (QTFs) with trapezoidal-head and round-head were designed adopted for quartz-enhanced photoacoustic spectroscopy (QEPAS) sensing. Based on finite element analysis, a theoretical simulation model was established optimize design QTF. For performance comparison, reported T-head QTF commercial also investigated. The QTFs have decreased resonant frequency ( f 0 ) increased gap between prongs experimentally determined QTF, 8690.69 Hz, 9471.67 9499.28 respectively. corresponding quality Q factors measured as 11,142, 11,411, 11,874. Compared resonance frequencies these reduced by 73.45%, 71.07%, 70.99% while maintaining comparable factor commercially mature Methane (CH 4 chosen analyte verify QTFs’ performance. signal-to-noise ratio (SNR) CH –QEPAS system based has been improved 1.75 times, 2.96 3.26 sensor investigated in detail. results indicated that exhibited an excellent linear concentration response. Furthermore, minimum detection limit (MDL) 0.87 ppm can be achieved when system’s average time 1200 s.

Language: Английский

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Quantum state manipulation and cooling of ultracold molecules

Nature Physics, Journal Year: 2024, Volume and Issue: 20(5), P. 702 - 712

Published: May 1, 2024

Language: Английский

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Recent developments in wearable breath sensors for healthcare monitoring

Communications Materials, Journal Year: 2024, Volume and Issue: 5(1)

Published: March 20, 2024

Abstract Within the breath lie numerous health indicators, encompassing respiratory patterns and biomarkers extending beyond conditions to cardiovascular health. Recently, emergence of SARS-CoV-2 pandemic has not only underscored necessity on-the-spot analysis but also normalized use masks in everyday life. Simultaneously, rapid evolution wearable technology given rise innovative healthcare monitoring tools, with a specific emphasis on sensors. This review explores current research trends utilizing breathing sensors detect diverse monitor parameters, including airflow, temperature, humidity. Additionally, it applications, ranging from recognizing swiftly detecting diseases. Integrating Internet Things machine learning technologies into these applications highlights their potential offer personalized, accurate, efficient solution.

Language: Английский

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Ultrasensitive multispecies spectroscopic breath analysis for real-time health monitoring and diagnostics

Proceedings of the National Academy of Sciences, Journal Year: 2021, Volume and Issue: 118(40)

Published: Oct. 1, 2021

Significance Determining the identity and concentration of molecules present in breath is a powerful tool to assess overall health person, analogous blood testing clinical medicine, but faster less invasive manner. The presence particular molecule (or combination molecules) can indicate certain condition or infection, facilitating diagnosis. Monitoring interest over time help track development recurrence) condition, as well effectiveness administered treatment. To make analysis more accessible widely adopted, we explore technique perform with high resolution, wide spectral coverage, specificity, sensitivity.

Language: Английский

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Broadband 1-GHz mid-infrared frequency comb

Light Science & Applications, Journal Year: 2022, Volume and Issue: 11(1)

Published: Sept. 7, 2022

Mid-infrared (MIR) spectrometers are invaluable tools for molecular fingerprinting and hyper-spectral imaging. Among the available spectroscopic approaches, GHz MIR dual-comb absorption have potential to simultaneously combine high-speed, high spectral resolution, broad optical bandwidth needed accurately study complex, transient events in chemistry, combustion, microscopy. However, such a spectrometer has not yet been demonstrated due lack of frequency combs with full coverage. Here, we introduce first broadband comb laser platform at 1 repetition rate that achieves coverage from 3 13 µm. This is based on commercially 1.56 µm mode-locked laser, robust all-fiber Er amplifiers intra-pulse difference generation (IP-DFG) few-cycle pulses χ(2) nonlinear crystals. When used dual spectroscopy (DCS) configuration, this source will enable measurements μs time (0.03 cm-1) point spacing >5 THz (>166 anywhere within atmospheric windows. represents unique resource characterizing fast non-repetitive currently inaccessible other sources.

Language: Английский

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Multiple Gas Detection by Cavity-Enhanced Raman Spectroscopy with Sub-ppm Sensitivity

Analytical Chemistry, Journal Year: 2023, Volume and Issue: 95(13), P. 5652 - 5660

Published: March 20, 2023

Accurate and sensitive detection of multicomponent trace gases below the parts-per-million (ppm) level is needed in a variety medical, industrial, environmental applications. Raman spectroscopy can identify multiple molecules sample simultaneously has excellent potential for fast diagnosis various samples, but applications are often limited by its sensitivity. In this contribution, we report development cavity-enhanced instrument using narrow-line width 532 nm laser locked with high-finesse cavity through Pound-Drever-Hall locking servo, which allows continuous measurement broad spectral range. An intracavity power up to 1 kW was achieved an incident about 240 mW, resulting significant enhancement signal range 200-5000 cm-1 sub-ppm sensitivity molecules. The technique applied different including ambient air, natural gas, reference gas sulfur hexafluoride, demonstrating capability quantitative components.

Language: Английский

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Fate of Sniff-the-Diseases Through Nanomaterials-Supported Optical Biochip Sensors

ECS Journal of Solid State Science and Technology, Journal Year: 2024, Volume and Issue: 13(4), P. 047004 - 047004

Published: April 1, 2024

Early diagnosis through noninvasive tools is a cornerstone in the realm of personalized and medical healthcare, averting direct/indirect infection transmission directly influencing treatment outcomes patient survival rates. In this context, optical biochip breathomic sensors integrated with nanomaterials, microfluidics, artificial intelligence exhibit potential to design next-generation intelligent diagnostics. This cutting-edge tool offers variety advantages, including being economical, compact, smart, point care, highly sensitive, noninvasive. makes it an ideal avenue for screening, diagnosing, prognosing various high-risk diseases/disorders by detecting associated breath biomarkers. The underlying detection mechanism relies on interaction biomarkers sensors, which causes modulations fundamental attributes, such as surface plasmon resonance, fluorescence, reflectance, absorption, emission, phosphorescence, refractive index. Despite these remarkable commercial development faces challenges, insufficient support from clinical trials, concerns about cross-sensitivity, challenges related production scalability, validation issues, regulatory compliance, contrasts conventional perspective article sheds light state disease diagnosis, addresses proposes alternative solutions, explores future avenues revolutionize healthcare

Language: Английский

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Real-time accurate detection and analysis of breath acetone using CRDS: Toward metabolic dynamic monitoring and potential application

Sensors and Actuators B Chemical, Journal Year: 2025, Volume and Issue: unknown, P. 137422 - 137422

Published: March 1, 2025

Language: Английский

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