Gas cell based on cascaded GRIN lens for optical fiber gas sensor

Sa, Jiming; Chen, Youping; Zhang, Gang; Zhou, Zude; Cui, Lujun

doi:10.1117/12.783642

Cited by 4 publications

(3 citation statements)

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“…To achieve a higher detection sensitivity, Sa et al and Ho et al proposed to use cascaded GRIN lenses to increase the effective absorption path length [52,53]. The latter fabricated a gas cell by cascading 10 pairs of fiber pigtailed GRIN lenses fixed to a circular metallic frame with an inner diameter of 10 cm.…”

Section: Open-path Sensormentioning

confidence: 99%

Gas detection with micro- and nano-engineered optical fibers

Jin

Cao

et al. 2013

Optical Fiber Technology

135

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a b s t r a c tThis paper overviews recent development in gas detection with micro-and nano-engineered optical fibers, including hollow-core fibers, suspended-core fibers, tapered optical micro/nano fibers, and fiber-tip micro-cavities. Both direct absorption and photoacoustic spectroscopy based detection schemes are discussed. Emphasis is placed on post-processing stock optical fibers to achieve better system performance. Our recent demonstration of distributed methane detection with a $75-m long of hollow-core photonic bandgap fiber is also reported.

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Section: Open-path Sensormentioning

confidence: 99%

Gas detection with micro- and nano-engineered optical fibers

Jin

Cao

et al. 2013

Optical Fiber Technology

135

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“…The structure is shown in Figure 3(c). For this kind of gas cell, the output can be expressed as [4][5]:…”

Section: Nkm= Fkqolar`qflk= =mentioning

confidence: 99%

Gradient–Index Fibre Based Miniature Gas Cell For Intra–Cavity Fibre Laser Sensors

Li¹,

Azmi²,

Peng³

2012

Jurnal Teknologi

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This paper presents a new and simple design of gas cell for the use of intra–cavity fibre laser sensors. This design utilizes gradient–index fibres for collimation to realize a miniature gas cell of very small diameter. By using the Gaussian field approximation and ray transformation, the gas cell is analyzed and optimized. It is found that gradient–index fibre based cells could achieve lower coupling loss of nearly 10 dB at a separation of 20 mm and allow for additional tolerance to certain misalignments, in comparison with those single–mode fibre based cells. A new–design cell is fabricated and its coupling loss is tested with a 1550 nm laser. Good agreement in the analysis and experimental results is obtained, indicating that the design could be feasible in practical gas sensing. Key words: Gradient–index fibre based cell; gradient–index fibre collimator (GIFC); coupling loss; misalignments; intra–cavity fibre gas sensor

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“…The beam passes through the gas cell, and then it is coupled into output optical fiber by output lenses. As this type of gas cell concerns the coupling of optical fiber and optical discrete component, its collimation is complex, its thermal stability and antivibrating performance must meet requirements of the optical gas sensor [14]. Figure 5 shows the optical fiber sensor as assembled in the laboratory.…”

Section: Low-cost Near-infrared Components Used In the Detection Systemmentioning

confidence: 99%

A near‐infrared optical fiber sensor for carbon monoxide concentration monitoring

Zhu

Chen

Zhang

et al. 2010

Micro & Optical Tech Letters

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An optical fiber sensor presented is capable of monitoring the presence of carbon monoxide (CO) in the exhaust environment. Conventional gas sensor used to detect CO concentration is often difficult to achieve high sensitivity, selectivity, and specificity in presence of a mixture of gases. The design of this sensor using DFB LD as light source and low-cost near-infrared components, which make it suitable for using in an exhaust environment, is discussed. The sensor based on spectrum absorption principle is immune to corrosion and poison as it consists of glass and ceramic parts. By using differential construction, it can eliminate the influence of common mode interfering signals caused by the wave of LDs light intension, thermal zero shift, and zero shift of photoelectric device. A national instrument cRIO-9215 data acquisition card was used to acquire the output voltages and a LabView virtual instrument was used to store and process data. The response of the sensor to carbon dioxide supplied from the standard gas with dry nitrogen as a balancing gas in the laboratory was performed. The experimental results indicated that the sensor has been developed to operate within an exhaust environment and have high sensitivity and stability so it does not suffer from other gases interferences. The lower limit of detection for the sensor was found to be not less than 50 ppm for CO. This can be meeting the requirement of 100 ppm which is to be poisonous to human.

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Gas cell based on cascaded GRIN lens for optical fiber gas sensor

Cited by 4 publications

References 0 publications

Gas detection with micro- and nano-engineered optical fibers

Gas detection with micro- and nano-engineered optical fibers

Gradient–Index Fibre Based Miniature Gas Cell For Intra–Cavity Fibre Laser Sensors

A near‐infrared optical fiber sensor for carbon monoxide concentration monitoring

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