Fiber-grating monitoring system for humidity of construction wall

The utility model provides a fiber-grating monitoring system for humidity of a construction wall, which is composed of a fiber grating, a polyimide film, a stainless steel fine net, a stainless steel pipe with small holes and an armor optical cable. The fiber grating is connected with the polyimide film which is connected with the stainless steel fine net, the stainless steel fine net is connected with the stainless steel pipe with the small holes, and the armor optical cable is connected with the fiber grating. The fiber grating is packaged through the polyimide film, a plurality of sensors are arranged on an optical fiber to form a wall humidity gradient monitoring system, the polyimide film has the advantages of being good in moisture expansion linearity and resistant to high temperature and corrosion, and accordingly the humidity gradient monitoring system which is good in durability, high in precision and capable of being quasi-distributed, facilitates construction operation and adapts to an internal env