TDLAS–WMS based near-infrared methane sensor system using hollow-core photonic crystal fiber as gas-chamber

He, Qixin; Dang, Peipei; Liu, Zhiwei; Zheng, Chuantao; Wang, Yiding

doi:10.1007/s11082-017-0946-2

Cited by 36 publications

(12 citation statements)

References 25 publications

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“…In Figure b, the transmittance spectra of PS-based LROCs are presented. As a result of formation of a PC, the transmittance shows a wave feature in the spectra which is attributed to light coupling into periodic structure of the nanoarray . After PS plasma etching process, the size of PS is reduced and the distance between the PS colloids is increased, thus forming a nonclosely packed LROC template and resulting in a different type of transmittance wave profile.…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Hydrogen Sensor: Enhanced Performance Enabled through Photoactive Pd-Decorated TiO₂ Colloidal Crystals

et al. 2020

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The high demand for H2 gas sensors is not just limited to industrial process control and leak detection applications but also extends to the food and medical industry to determine the presence of various types of bacteria or underlying medical conditions. For instance, sensing of H2 at low concentrations (<10 ppm) is essential for developing breath analyzers for the noninvasive diagnosis of some gastrointestinal diseases. However, there are major challenges to overcome in order to achieve high sensitivity and hence low limit of detection (LoD) toward H2. In this study, it is demonstrated that light-assisted amperometric gas sensors employing sensitive layers based on Pd-decorated TiO2 long-range ordered crystals can achieve excellent H2 sensing performance. This unique combination of materials and novel layered structure enables the detection of H2 gas down to 50 ppm with highly promising LoD capabilities. The sensor response profiles revealed that the sensor’s signal-to-noise ratio was higher in the presence of light when operated with a 9 V bias (relative to other conditions used), producing a LoD of only 3.5 ppm at an operating temperature of 33 °C. The high performance of the sensor makes it attractive for applications that require low-level (ppm as opposed to conventional % levels) H2 gas detection. Most importantly, the developed sensor exhibited high selectivity (>93%) toward H2 over other gas species such as CO2, C4H8O, C3H6O, CH3CHO, and NO, which are commonly found to coexist in the environment.

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Section: Resultsmentioning

confidence: 99%

Low-Temperature Hydrogen Sensor: Enhanced Performance Enabled through Photoactive Pd-Decorated TiO₂ Colloidal Crystals

et al. 2020

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“…A laser driver module integrated with a temperature controller was used to drive the ICL for a stable emitting wavelength range, with the driving signal generated by a signal generator contained in a field programmable gate array (FPGA)-based lock-in module. Here, a sawtooth signal superimposed by a high-frequency sinusoidal modulating signal was set as the driving signal to perform wavelength modulation spectroscopy (WMS) detection. − The lock-in amplifier, which was another part of the lock-in module, was used to extract the second harmonic (2 f ) absorption spectrum from the MCT detector’s output and simultaneously generate a square-wave signal for trigging a synchronous 2 f spectrum acquisition. The core processor was a self-designed SCC unit based on a DSP (Texas Instruments, model TMS320F28335).…”

Section: Sensor System Configurationmentioning

confidence: 99%

Midinfrared Sensor System Based on Tunable Laser Absorption Spectroscopy for Dissolved Carbon Dioxide Analysis in the South China Sea: System-Level Integration and Deployment

et al. 2020

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System-level integration of a midinfrared carbon dioxide (CO2) sensor system based on tunable laser absorption spectroscopy (TLAS) was realized for the analysis of dissolved CO2 in seawater, employing an interband cascade laser (ICL) centered at 4319 nm and a multipass cell (MPC) with an optical path length of 29.8 m. At a low measurement pressure of 30 Torr, three absorption lines of 12CO2 were selected to realize different measurement ranges and a 13CO2 absorption line was targeted for simultaneous isotopic abundance analysis of δ13CO2. The sensor system was compactly integrated into a standalone system with automatic operation for underwater field deployment, and the working process was controlled by a specially designed electrical system. A gas–liquid separator system was developed for CO2 extraction from water, and a pressure-control mechanism with two operation modes (i.e., static and dynamic modes) was proposed to make the sensor system applicable under a deep-sea environment. A series of experiments were carried out in the laboratory for performance assessment of the developed sensor system employed for the analysis of dissolved CO2 in water. The sensor was deployed for a field test for natural gas hydrates exploration at an underwater depth of 0–2000 m in the South China Sea, with the sensor operating normally during the deployment.

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“…PBG HCF-based gas sensing has mainly been performed in the spectral region between 1530 and 1700 nm (HC-1550-02 fiber from NKT Photonics, shown in Figure 8, is by far the most popular choice, and has been used in multiple papers presenting HCF-based gas sensing [40][41][42][43][45][46][47][48][49][50]). However, as mentioned in the introduction, the mid-infrared spectral region offers stronger molecular transitions.…”

Section: Gas Sensing Inside Photonic Bad-gap Hollow-core Fibersmentioning

confidence: 99%

Laser-Based Trace Gas Detection inside Hollow-Core Fibers: A Review

Nikodem

2020

Materials

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Thanks to the guidance of an optical wave in air, hollow-core fibers may serve as sampling cells in an optical spectroscopic system. This paper reviews applications of hollow-core optical fibers to laser-based gas sensing. Three types of hollow-core fibers are discussed: Hollow capillary waveguides, photonic band-gap fibers, and negative curvature fibers. Their advantages and drawbacks when used for laser-based trace gas detection are analyzed. Various examples of experimental sensing systems demonstrated in the literature over the past 20 years are discussed.

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TDLAS–WMS based near-infrared methane sensor system using hollow-core photonic crystal fiber as gas-chamber

Cited by 36 publications

References 25 publications

Low-Temperature Hydrogen Sensor: Enhanced Performance Enabled through Photoactive Pd-Decorated TiO₂ Colloidal Crystals

Low-Temperature Hydrogen Sensor: Enhanced Performance Enabled through Photoactive Pd-Decorated TiO₂ Colloidal Crystals

Midinfrared Sensor System Based on Tunable Laser Absorption Spectroscopy for Dissolved Carbon Dioxide Analysis in the South China Sea: System-Level Integration and Deployment

Laser-Based Trace Gas Detection inside Hollow-Core Fibers: A Review

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TDLAS–WMS based near-infrared methane sensor system using hollow-core photonic crystal fiber as gas-chamber

Cited by 36 publications

References 25 publications

Low-Temperature Hydrogen Sensor: Enhanced Performance Enabled through Photoactive Pd-Decorated TiO2 Colloidal Crystals

Low-Temperature Hydrogen Sensor: Enhanced Performance Enabled through Photoactive Pd-Decorated TiO2 Colloidal Crystals

Midinfrared Sensor System Based on Tunable Laser Absorption Spectroscopy for Dissolved Carbon Dioxide Analysis in the South China Sea: System-Level Integration and Deployment

Laser-Based Trace Gas Detection inside Hollow-Core Fibers: A Review

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Low-Temperature Hydrogen Sensor: Enhanced Performance Enabled through Photoactive Pd-Decorated TiO₂ Colloidal Crystals

Low-Temperature Hydrogen Sensor: Enhanced Performance Enabled through Photoactive Pd-Decorated TiO₂ Colloidal Crystals