Optical-circuit type device for detecting reformulated fuel and method for manufacturing sensor element thereof

The optical sensor circuit type fuel testing apparatus is disclosed. Light-loop fuel test sensor according to one embodiment of the present invention includes a light source for generating a short wavelength; Sensor unit for receiving the optical signal generated from the light source unit outputs an optical signal based on a sensing signal; A first optical detector for outputting a reference light signal output receiving the reference light signal; A second optical detector for outputting a sensing signal light output by receiving the sensing signal; Operation control section for determining the characteristics of the fuel receiving the reference light output signal and sensing the light output signal; An output unit for outputting the received result of said control operation; It includes.