Non-dispersive sensing scheme based on mid-infrared LED and differential mode excitation photoacoustic spectroscopy

Rey, Julien; Sigrist, Markus W.

doi:10.1016/j.pacs.2023.100455

Cited by 4 publications

(4 citation statements)

References 53 publications

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“…In the PAS techniques, the light source directly affects the working modes and detection performance. These include popular narrow bandwidth lasers [12][13][14], mid-infrared LEDs [15], and infrared blackbody radiation sources [16]. Lasers are generally used to detect single-component gases in the resonant mode.…”

Section: Introductionmentioning

confidence: 99%

High-Precision Low-Cost Mid-Infrared Photoacoustic Gas Sensor Using Aspherical Beam Shaping for Rapidly Measuring Greenhouse Gases

Hu,

Ai,

Sima

et al. 2024

Photonics

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A high-precision low-cost mid-infrared photoacoustic sensor for greenhouse composite gases based on aspherical beam shaping is proposed and demonstrated. The assembled optical source module and luminous characteristics of infrared source are innovatively investigated and analyzed with aspherical beam shaping. The proposed aspherical-beam-shaping-technique could effectively reduce optical loss and enhance system sensitivity, achieving an effective power utilization ratio of a radiation source of 91% and sidewall noise ratio of 8.9%. Experiments verify the 1.7 times improvement in responsivity and 50% enhancement in minimum detection limit (MDL) on average. In terms of comprehensive greenhouse gas composites and with short integration time of 1 s, MDLs of CO2, CH4, N2O, NF3, SF6, PFC-14, and HFC-134a are 73 ppb, 267 ppb, 72 ppb, 81 ppb, 14 ppb, 9 ppb and 115 ppb, respectively. Furthermore, a 48 h continuous monitoring of H2O, CO2 and CH4 in the atmosphere is conducted and verifies the performance of the gas sensor. The developed sensor allows for the rapid route of low-cost and high-precision detection of multiple greenhouse gases.

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Section: Introductionmentioning

confidence: 99%

High-Precision Low-Cost Mid-Infrared Photoacoustic Gas Sensor Using Aspherical Beam Shaping for Rapidly Measuring Greenhouse Gases

Hu,

Ai,

Sima

et al. 2024

Photonics

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“…Consequently, the potential of sensing strategies that are able to combine miniaturization, sensitivity, and selectivity hinges on the spectral features of the sensor’s components. For most hydro-carbons, carbon dioxide, and most green-house gases, the midinfrared range, and consequently indirect photoacoustic approaches, are the most promising candidates …”

mentioning

confidence: 99%

“…For most hydro-carbons, carbon dioxide, and most green-house gases, the midinfrared range, and consequently indirect photoacoustic approaches, are the most promising candidates. 13 To date, photoacoustic-based NDIR devices have been shown to outperform their standard NDIR cousins in terms of selectivity and sensitivity by about 1 order of magnitude. 14 As a result, the optical absorption path can be shortened to the extent that integrated microfabrication becomes feasible while retaining the sensitivity feature of much bigger devices using standard light detectors.…”

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confidence: 99%

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Integrated, Selective, Simultaneous Multigas Sensing Based on Nondispersive Infrared Spectroscopy-Type Photoacoustic Spectroscopy

Rodriguez Gutierrez,

Ortiz Perez,

Palzer

2023

ACS Sens.

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Most chemical sensing scenarios require the selective and simultaneous determination of the concentrations of multiple gas species. In order to enable large-scale monitoring, reliability, robustness, and the potential for integration and miniaturization are key parameters that next-generation sensing technologies must comply with. Due to their superior sensitivity and selectivity as compared to standard NDIR-type systems, photoacoustic NDIR-approaches offer a means for selective detection at much reduced system dimensions such that microintegration becomes feasible. This contribution presents an acoustic frequency multiplexing method to integrate sensing capabilities for the parallel analysis of multiple gases in a single device without loss in selectivity via sound frequency separation. The approach is demonstrated using mid-infrared light emitting diodes and a multigas photoacoustic detector to monitor some of the most important greenhouse gases: carbon dioxide and methane. The number of gas species the sensor concept is able to detect simultaneously can be expanded without increasing the size of the system or its complexity. Additionally, the results demonstrate that the integrated device features the same selectivity and sensitivity as the currently used single gas photoacoustic NDIR systems. Furthermore, the possibility of an extension to any number of gas species is argued.

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Acoustic modeling and performance evaluation of 3D-printed and metal differential photoacoustic sensors for trace gas detection

Lima,

Pelais,

Neto

et al. 2024

Measurement

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Non-dispersive sensing scheme based on mid-infrared LED and differential mode excitation photoacoustic spectroscopy

Cited by 4 publications

References 53 publications

High-Precision Low-Cost Mid-Infrared Photoacoustic Gas Sensor Using Aspherical Beam Shaping for Rapidly Measuring Greenhouse Gases

High-Precision Low-Cost Mid-Infrared Photoacoustic Gas Sensor Using Aspherical Beam Shaping for Rapidly Measuring Greenhouse Gases

Integrated, Selective, Simultaneous Multigas Sensing Based on Nondispersive Infrared Spectroscopy-Type Photoacoustic Spectroscopy

Acoustic modeling and performance evaluation of 3D-printed and metal differential photoacoustic sensors for trace gas detection

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