Abstract
A multi-parameter measurement system based on ultra-weak fiber Bragg grating (UFBG) array with sensitive material was proposed and experimentally demonstrated. The UFBG array interrogation principle is time division multiplex technology with two semiconductor optical amplifiers as timing units. Experimental results showed that the performance of the proposed UFBG system is almost equal to that of traditional FBG, while the UFBG array system has obvious superiority with potential multiplexing ability for multi-point and multi-parameter measurement. The system experimented on a 144 UFBG array with the reflectivity of UFBG ~0.04% for the four target parameters: hydrogen, humidity, temperature and salinity. Moreover, a uniform solution was customized to divide the cross-sensitivity between temperature and other target parameters. It is expected that this scheme will be capable of handling thousands of multi-parameter sensors in a single fiber.
Highlights
The development trends towards the generation of optical fiber sensing networks aim for huge capacity, long distance, and high precision
We proposed and demonstrated a sensing array huge-capacity fiber sensing networks
We proposed and demonstrated a sensing array for multi-parameter measurements based on a ultra-weak fiber Bragg grating (UFBG) with sensitive material coating
Summary
The development trends towards the generation of optical fiber sensing networks aim for huge capacity, long distance, and high precision. The huge capacity of optical fiber sensing networks includes two aspects of content, i.e. more points and more parameters of measurement. A serial TDM sensing network for multi-parameter measurement based on UFBGs coated with sensitive materials is proposed and experimentally demonstrated [4]. A UFBG array sensing system for hydrogen, relative humidity (RH), temperature and salinity measurements in a single fiber by coating different sensitive materials on different UFBGs is realized [5,6]. Covered with Pd. The accumulating central wavelength shift on the same principle, for which the sensor is covered with. The accumulating central associated with multi-parameter (strain and temperature) measurement of FBG can be analytically wavelength shift associated calculated from. With multi-parameter (strain and temperature) measurement of FBG can be analytically calculated from Equation (1) Equation (1). with multi-parameter (strain and temperature) measurement of FBG can be analytically calculated from Equation (1)
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