Detection of Gas Concentration by Correlation Spectroscopy Using a Multi-Wavelength Fiber Laser

Abstract

Abstract-A correlation spectroscopy (COSPEC) based on a multiwavelength fiber laser is first proposed for the detection of gas concentration. The lasing wavelengths are selected to match several characteristic absorption peaks of the gas under test, and the gas concentration is easily measured by correlating it with the reference gas. The present method is immune from the instability of the light source and the influence of other gases. The concentration measurement of C 2 H 2 is demonstrated in the experiment in its nearinfrared dominant absorption region. The technique has prospects for simultaneous detection of multiple gases, and the measurement of mixed gases of C 2 H 2 and CO 2 is also analyzed.

Gas-self-filter-based erbium-doped fiber loop laser for gas detection

“…As shown in Fig. 7, correlation spectroscopy [6,8] is employed to improve the system stability. The basic principle of correlation spectroscopy is to compare the recorded absorption spectrum of the sample gas with that of the particular reference gas of interest.…”

“…Tunable diode laser absorption spectroscopy (TDLAS) is a common technology [1,2], with high sensitivity and selectivity. Many techniques based on TDLAS have been developed, e.g., gas in scattering media absorption spectroscopy (GASMAS) [3], quartz-enhanced photoacoustic spectroscopy (QEPAS) [4,5], correlation spectroscopy (COSPEC) [6][7][8]. In these applications, the key issue is to select a certain type of light source with the emission spectrum covering at least one absorption line of the investigated gas.…”

Enhancement of Brillouin Stokes generation in the S-band region using a combination S-band Depressed Cladding Erbium Doped Fiber and Semiconductor Optical Amplifier

“…One of the most important components in develop ing these systems are multiwavelength laser sources, which can also find applications in many other areas such as sensor systems [1], microwave signal process ing [2], optical spectroscopy measurement [3] and high capacity communication networks [4].There are 1 The article is published in the original. many approaches towards generating multiwavelength laser sources, such as multiple semiconductor laser arrays.…”

Hydrostatic Pressure Sensor Based on a Gold-Coated Fiber Modal Interferometer Using Lateral Offset Splicing of Single Mode Fiber

“…Optical fiber sensors [1][2][3][4][5][6][7][8][9][10][11][12][13] have attracted considerable attention in the past several decades due to their wide applications for a great variety of measurements such as temperature, strain, chemical concentration, refractive index, hydrostatic pressure and their advantages such as small size, light weight, high sensitivity, multiplexing capability, and immunity to electromagnetic interference. Among them, several hydrostatic pressure sensing techniques have been developed, which include hydrostatic pressure sensors based on birefringent fibers [14][15][16], photonic crystal fibers (PCFs) (or microstructured fibers) [17][18][19][20][21][22][23][24], fiber Bragg gratings (FBGs) [18], and Fabry-Pérot interferometers (FPIs) [25][26][27].…”