Photonic crystal fiber with spiral cladding has been induced as gas based sensor made of micro-structure shaped cladding and core comprises circular air filled holes. The described S-PCF constructed with double layer core of circular geometry surrounded by seven-layer circular cladding. The aggregate recreation procedure of the S-PCF is finished by utilizing a full vector method of finite element amidst perfectly matched layer limit precondition. All the numerical values analogous to the radii and pitches of center and outer cladding are induced with advanced framework. On further analysis, numeral testing S-PCF demonstrates high value relative sensitivity along with minimum confinement loss. The authorized results affirm the relative sensitivity as 58.02% along with the confinement loss as 0.094x 10-2 at 1.33 um wavelength. Furthermore, various properties like birefringence, effective modal area, non-linearity and V parameter are also observed. © 2018 IEEE.