1. Basic principles

As the grating period changes, the wavelength reflected by the fiber Bragg grating will correspondingly change.To sense stress or temperature changes. For humidity sensitive optical fibers, as humidity increases, the fiber absorbs water and expands, increasing the grating period; When the temperature decreases, the fiber shrinks due to dehydration, reducing the grating period. In addition, it is necessary to add temperature sensing fibers or fibers with different humidity sensitivity coefficients for mutual calibration.

2. Production process

Our company achieves humidity sensing by changing the composition of the polyimide fiber coating layer to increase the humidity sensitivity of the coating material.

3. Product advantages

(1) Humidity sensitivity coefficient adjustable, 5pm-15pm/humidity percentage

(2) Fast response speed, fast response within 10 seconds, tends to stabilize within 3 minutes(3) Real time measurement of humidity over large distances

(4) Excellent mechanical properties

(5) Long lifespan

(6) Quasi distributed humidity sensing

4.Typical applications

Quasi distributed continuous humidity sensing for cable-stayed bridges, grain depots, cotton and linen storage warehouses, and other places that require strict humidity monitoring.

5. Product indicators