High temperature stable fiber grating sensor and method for producing same
摘要
<p>A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000 °C and where the grating is relatively stable and has very low loss from scatter. These gratings have spectral characteristics that allow them to be concatenated so as to form a sensor array. The method requires a step of lowering the characteristic intensity threshold of a waveguide by at least 25%, followed by irradiating the waveguide with femtosecond pulses of light having a sufficient intensity and for a sufficient duration to write the grating so that at least 60% of the grating remains after exposures of at least 10 hours at a temperature of at least 1000 °C. Pre-writing a Type I grating before writing a minimal damage Type II grating lowers the characteristic threshold of the waveguide so that a stable low damage type II grating can be written; alternatively providing a hydrogen or deuterium loaded waveguide before writing the grating lowers the characteristic threshold of the waveguide.</p>
申请公布号
EP2136227(A1)
申请公布日期
2009.12.23
申请号
EP20090162999
申请日期
2009.06.17
申请人
HER MAJESTY THE QUEEN IN RIGHT OF CANADA, AS REPRESENTED BY THE MINISTER OF INDUSTRY
发明人
SMELSER, CHRISTOPHER W.;MIHAILOV, STEPHEN J.;GROBNIC, DAN;LU, PING;WALKER, ROBERT B.;CUGLIETTA, GINO;DING, HUIMIN;DAI, XIAOLI