An optical fiber methane sensing system employing a two-step reference measuring method

Jiang, Yi; Tang, Caijie

doi:10.1016/j.snb.2008.02.009

Cited by 9 publications

(3 citation statements)

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“…Fabry-Pérot cavities are routinely used as narrowband optical filters for MEMS-based spectrometers [27][28][29][30][31]. A small gap between two highly reflective mirrors defines an optical cavity and wavelengths that constructively interfere within this cavity are passed though the Fabry-Pérot structure.…”

Section: Broadband Fabry-pérot Spectrometer (Uwa)mentioning

confidence: 99%

“…The corresponding reduction in free spectral range in accordance with (3) is acceptable for these applications, as a wide tuning range is not required. These same devices have also been applied in spectroscopy [27][28][29], however the limited wavelength range restricts their use. Many spectroscopy applications require larger tuning ranges, and, as such the Fabry-Pérot filters must either operate in a low-order mode, or else use multiple Fabry-Pérot filters to cover the desired wavelength range.…”

Section: Broadband Fabry-pérot Spectrometer (Uwa)mentioning

confidence: 99%

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MEMS-based microspectrometer technologies for NIR and MIR wavelengths

Schuler

Milne

Dell

et al. 2009

J. Phys. D: Appl. Phys.

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Commercially manufactured near-infrared (NIR) instruments became available about 50 years ago. While they have been designed for laboratory use in a controlled environment and boast high performance, they are generally bulky, fragile and maintenance intensive, and therefore expensive to purchase and maintain. Micromachining is a powerful technique to fabricate micromechanical parts such as integrated circuits. It was perfected in the 1980s and led to the invention of micro electro mechanical systems (MEMSs). The three characteristic features of MEMS fabrication technologies are miniaturization, multiplicity and microelectronics. Combined, these features allow the batch production of compact and rugged devices with integrated intelligence. In order to build more compact, more rugged and less expensive NIR instruments, MEMS technology has been successfully integrated into a range of new devices. In the first part of this paper we discuss the UWA MEMS-based Fabry–Pérot spectrometer, its design and issues to be solved. MEMS-based Fabry–Pérot filters primarily isolate certain wavelengths by sweeping across an incident spectrum and the resulting monochromatic signal is detected by a broadband detector. In the second part, we discuss other microspectrometers including other Fabry–Pérot spectrometer designs, time multiplexing devices and mixed time/space multiplexing devices.

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Section: Broadband Fabry-pérot Spectrometer (Uwa)mentioning

confidence: 99%

Section: Broadband Fabry-pérot Spectrometer (Uwa)mentioning

confidence: 99%

MEMS-based microspectrometer technologies for NIR and MIR wavelengths

Schuler

Milne

Dell

et al. 2009

J. Phys. D: Appl. Phys.

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“…The differential absorption technique has been introduced to increase the performance of the methane sensors. (7)(8)(9)(10)(11) In the differential absorption technique, the two wavelengths, one coinciding with one of the absorption lines of methane and the other one shifting slightly away from the absorption line, can be obtained by using two interference filters, (7) a dual-electrode wavelength-tunable distributed feedback (DFB) laser diode (LD), (8) a wavelength-tunable Fabry-Perot filter, (8) fiber Bragg gratings (FBGs), (10) or a fiber loop. (11) In this paper, a fiber optic methane sensing system based on the wavelength-scanning DFB laser that is tuned by temperature is experimentally demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Fiber Optic Methane Sensing System Based on the Temperature-Tunable Distributed Feedback Laser

Xiao¹,

Jiang²,

Tang³

2018

Sensors and Materials

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A fiber optic methane sensing system based on the temperature-tunable distributed feedback (DFB) laser is experimentally demonstrated. Two laser diodes (LDs) with different wavelengths are used in the system. One LD operates in the wavelength scanning mode, and the other LD is used as the reference beam to eliminate the fluctuation of light intensity. By comparing the intensities of the two wavelengths during wavelength scanning, we can determine methane content. Experimental results show that a measurement resolution of 0.038% can be reached. The obtained measuring system has good properties of high precision, low cost, and high reliability.

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