APPARATUS FOR OPTICAL IDENTIFICATION OF MEASUREMENT CHANNELS OF BUILT-IN NONDESTRUCTIVE INSPECTION SYSTEM BASED ON FIBRE-OPTIC BRAGG SENSORS Russian patent published in 2014 - IPC G01B11/16 

FIELD: physics, optics.

SUBSTANCE: invention relates to tools for detecting signals from a set of fibre-optic Bragg sensors of a built-in nondestructive inspection system. The apparatus for optical identification of measurement channels of a built-in nondestructive inspection system based on fibre-optic Bragg sensors includes an optical radiation source, a three-terminal optical splitter, a reference Bragg grating with a known reflected radiation wavelength characteristic, multiple measurement channels with measurement Bragg fibre gratings placed on the inspected object, a system for insulating the reference grating from external perturbations, including a heat stabilisation system; a photodetector and a signal detecting and converting unit which is connected to a computer. Address reference gratings with non-recurrent reflected radiation wavelength characteristics are each built into each measurement channel. All reference gratings are placed in a housing with the system for insulation from external perturbations. A superluminescent diode is used as a continuous wideband optical radiation source. The apparatus further includes an optical insulator and an optical switch, wherein the optical insulator is placed between the output of the source and the input terminal of the three-terminal splitter, one output terminal of which is connected to the common input of the optical switch. Each connected output of the optical switch is connected to its own measurement channel. The other output terminal of the splitter is connected to the input of the photodetector and the signal detecting and converting unit.

EFFECT: considerable simplification of the circuit of the device with guaranteed reliability of identifying (addressing) measurement channels connected to a computer and wider dynamic range of measured optical signals.

1 dwg