Long-period grating sensor method and apparatus

摘要

This invention one in test medium or regards the system and method in order to detect plural object chemical compounds making use of the photodetector and the photodetector. With one feature, the long periodic lattice and solid phase micro extraction (SPME) disclosing the photodetector which includes the membrane to test medium, one or plural object chemical compounds try are distributed that selectively in the solid phase micro extraction membrane. By comparison with the optical property to which the sensor in at least one optical property of the sensor which is disclosed to test medium, under non existing of test medium one corresponds at least, difference difference of optical property one in test medium or shows the detection of plural object chemical compounds here. Method and the system have the SPME membrane, it is possible to measure the optical property of the sensor or making use of the long periodic lattice sensor, and the fiber loop linking-down spectroscopy which the possession are not done.