Laser speckle DIC method-based Fusion reactor divertor target plate strain measurement system and method

Abstract

The invention discloses a laser speckle DIC method-based Fusion reactor divertor target plate strain measurement system and a method. The system comprises a laser, a laser beam expanding collimation system, a first band-pass filtering optical system, a second band-pass filtering optical system, a first CCD imaging system, a second CCD imaging system, a computer image processing system, a divertortarget plate test piece, a fusion reactor device and a device window; the laser irradiates the surface of the divertor target plate through the laser beam expanding and collimating system and the device window to generate laser speckles; the first CCD imaging system and the second CCD imaging system carry out imaging on laser speckles filtered by the first band-pass filtering optical system and the second band-pass filtering optical system; the computer image processing system collects speckle reference images and deformation images; and the strain of the divertor target plate is calculated through the DIC method. The device is simple in structure, resistant to high temperature, good in anti-seismic property and capable of achieving on-line, high-precision and full-field measurement of surface deformation and displacement of the divertor target plate.

Description

technical field [0001] The invention relates to the technical field of optical non-contact diagnosis of the strain of a divertor target plate of a tokamak device, in particular to a fusion reactor divertor target plate strain measurement system and method based on a laser speckle DIC method. Background technique [0002] The divertor is one of the most important components in the tokamak device. As the first wall directly facing the plasma, the target plate is often subject to extremely high transient thermal loads. Therefore, the reliability of the divertor target plate is critical to the safety of the device. , is critical to successful operation. Many research institutions regard the temperature and structural response behavior of divertor target plate in high-constraint mode operation as an important research direction. The existing divertor target plate strain diagnosis technology is mainly contact measurement methods such as resistance strain gauge and FBG strain gaug...

AI Technical Summary

Problems solved by technology

The contact measurement method usually needs to arrange test points on the target plate material. Although the local measurement accuracy is high, it is difficult to adapt to the extreme operating environment of high temperature and strong electromagnetic field, and the contact measurement method is inevitable for the tokamak device. Introduce interference and external pollution to the operating environment inside the core stack, which makes online diagnosis of divertor target plate strain very difficult

The existing non-contact divertor target plate strain measurement technologies mainly include laser speckle interferometry technology, X-ray diffraction technology, etc., but these measurement methods have poor anti-seismic effects, and usually can only be built on the experimental platform and cannot meet the needs of online detection.

Ordinary digital image correlation methods usually require manual speckling. When applied in a high-temperature environment, the thermal mismatch between the speckle and the substrate is prone to detachment and vaporization, which may not only introduce impurities into the stack, but also greatly reduce the reliability of detection.

Images