DEVICE FOR OPTICAL IDENTIFICATION OF MEASUREMENT CHANNELS OF A BUILT-IN NON-DESTRUCTIVE CONTROL SYSTEM BASED ON FIBER-OPTIC BRAGG GRATINGS

摘要

The invention relates to devices for registering signals from a set of fiber-optic Bragg gratings in a built-in non-destructive object control system. The device for optical identification of measurement channels in a built-in non-destructive control system comprises a source of optical radiation, a tripolar optical splitter, a reference Bragg grating having a known reflected radiation wavelength, several measurement channels with fiber Bragg gratings located on the object being tested, a system for insulating the reference Bragg grating from external disturbing effects, a photodetector device and a unit for registering and converting signals, said unit being connected to a computer. One addressable reference Bragg gratings having non-repeating reflected radiation wavelengths is built into each measurement channel. All reference gratings are placed in a body insulated for protection against external disturbing effects. A superluminescent diode (SLD) is used as a continuous broad-band source of optical radiation. The device further includes an optical insulator and an optical switch, the optical insulator being installed between the output of the source and the input pole of the tripolar optical splitter, one output pole of which is connected to the common input of the optical switch. Each connectable output of the optical switch is connected to its own measurement channel. The other output pole of the splitter is connected to an input of the photodetector device and of the signal registering and converting unit. The technical result is simultaneous significant simplification of the device circuit with warranted assurance of reliability of identification (addressing) of measurement channels connected to the computer, and an increase in dynamic range of optical signals being measured.