Simultaneous Measurement of Strain and Temperature Using a Single Emission Line

Abstract

This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract-In this study, we present and demonstrate a novel sensor system for simultaneous measurement of strain and temperature through a unique combination of a long period grating and a fiber laser based on a fiber Bragg grating. In order to achieve this, a new erbium-doped fiber laser structure is created, showing an optical signal-to-noise ratio of 55 dB and a peak power measured on the optical spectrum analyzer between −5 and 0 dBm. The strain and the temperature information can be obtained by using a unique emission line through monitoring both the fiber laser wavelength shift and the change of the power level, both of which showing a clear linear behavior. Permanent

Simultaneous Measurement of Strain and Temperature With a Few-Mode Fiber-Based Sensor

“…PTICAL fiber sensors, which can measure strain and temperature simultaneously, have potential applications in many industrial processes such as structural health monitoring, various industrial fabrication processes and in other optical fiber sensors and various designs of such sensor systems have been intensively studied over recent years. Such methods for the simultaneous measurement of strain and temperature can be categorized as follows: i) two individual sensors with different sensitivities to strain and temperature, such as two fiber Bragg grating (FBG) with different grating periods [1], different types of fiber structure [2], using emission lines [3], long period gratings [4] or fluorescent fiber techniques [5]; ii) one single sensor with two or more outputs which show different responses to strain and temperature (such as the peak or dip wavelengths formed by interference between two different orders of core/cladding modes with the fundamental mode in one compact fiber interferometer) constructed by splicing a suspended core photonic crystal fiber [6], a liquid-filled photonic crystal fiber [7], or a fiber taper and lateral-shifted junction [8] with normal single mode fiber (SMF). In some of these designs, the use of two sensors located at different positions can cause errors in the measurement of one or the other measurand (as they are not co-located).…”

Fiber Bragg Izgara Sensörü için Merkezi Dalga Boyu Algılamaya Hilbert Dönüşümü Yaklaşımı

“…Bu fiziksel büyüklüklere, kuvvet, sıcaklık, gerilim vb. örnek verilebilir [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Bu tip sensörler birçok avantaja sahiptir, örneğin elektromanyetik alanlardan etkilenmezler düşük fiyatlıdırlar, pasif yapıdadırlar, bulundukları yerde elektrik ihtiyacı duymazlar, periyodik bakım gerektirmezler vb.…”

Fiber Bragg grating based linear cavity fibre laser temperature sensor with enhanced optical signal-to-noise ratio

“…Besides ring cavity, the design of linear cavity has been adopted for the development of fiber laser temperature sensors [10][11][12][13][14][15]. In [10,11], dual wavelength fiber laser with linear cavity was demonstrated for temperature sensing.…”

“…Both designs managed to obtain OSNR in excess of 50 dB but the designs lack of simplicity due to the utilization of photodetectors in their operation. Meanwhile in [14], the design requires for the reflected peak of an FBG to be placed at the slope of a long period grating (LPG) and this enhances the complexity of the system despite having the laser with OSNR of 55 dB. In a more recent development [15], a fiber laser with OSNR of more than 50 dB can sense temperature up to 1000 °C but the laser wavelength has quadratic relationship with the temperature.…”