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Abstract
Specialty fibers have introduced new functionalities and opportunities in distributed fiber sensing applications. Particularly, Brillouin optical time domain analysis (BOTDA) systems have leveraged the unique features of specialty fibers to achieve performance enhancement in various sensing applications. This paper provides an overview of recent developments of the specialty fibers based BOTDA technologies and their sensing applications. The specialty fibers based BOTDA systems are categorized and reviewed based on the new features or performance enhancements. The prospects of using specialty fibers for BOTDA systems are discussed.
Highlights
Novel specialty optical fibers with engineered materials or specially designed structures have enabled new opportunities to explore novel functionalities and applications
One of the successful applications is in the Brillouin optical time domain analysis (BOTDA) systems, which has emerged as a fast-developing distributed fiber sensor technology for measuring temperature and strain in the past two decades
Discriminative sensing of temperature and strain is an important and desirable capability in BOTDA systems because the optical fiber and its BGS are subject to changes in both parameters
Summary
Novel specialty optical fibers with engineered materials or specially designed structures have enabled new opportunities to explore novel functionalities and applications. One of the successful applications is in the Brillouin optical time domain analysis (BOTDA) systems, which has emerged as a fast-developing distributed fiber sensor technology for measuring temperature and strain in the past two decades. The capability of distributed strain and temperature measurement and the benefits of a fiber optic sensor system have made the BOTDA systems a favorable solution for long term structural health monitoring (SHM) and assessment of infrastructure. The research and application regarding optical fiber cables for Brillouin distributed sensing are reviewed in [12], showing successful exploitation of the Brillouin sensing technique. SSppeecciaialtltyyfifbibeerrssssuucchhaassPPCCFFssaannddhhoollloloww-c-coorreefifbibeerrssccoonntataininhhooleleyysstrturucctutureress, ,wwhhicichh pprroovvidideeaannidideeaal lpplalatftoforrmmtotoininteteggrraatetewwitihthhhigighhggaaininSSBBSSmmeeddiuiummtotobboooosst tththeeoovveerarallll BBrrilillolouuininaammpplliififcicaattiioonn..PPeeccuulliiaarrBBrriilllloouuiinnssccaatttteerriinnggffeeaattuurreessooffssppeecciiaallttyyfifibbeerrssaarreelleevveerr-aaggeeddtotoimimpprroovveeththeesesennssoorrppeerfroformrmaanncceeooffBBOOTTDDAAsysysstetemmss, ,susucchhaassppoolalarirzizaatitoionnnnooisiese ssuupppprreessssiioonn,,eennhhaanncceemmeennttooffsseennssitiitvivitiyty, ,etect.c.TThheetetmemppereartauturer-ec-ocommppeennsasateteddddisitsrtirbibuutetedd sstrtraaininmmeeaassuurreemmeennt,t,oorrddisisccrrimimininaatitninggththeerreessppoonnsseefrfroommtetemmppeerraatuturereaannddsstrtraainin, ,isisaakkeeyy challenge in the BOTDA solutions To overcome this challenge, various specialty fibers hcahvaellbeneegne iinntrtohdeuBcOedTDtoAthseoBluOtiToDnsA. The aforementioned opportunities have generated substantial interest and driven the advancement of the specialty fiber based BOTDA systems with favorable features and performance enhancements as reviewed
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