A device for observing laser-induced thermal convection in SBS-PCM in real time based on the schlieren method

By employing collinear propagation of probe and pump beams within the SBS-PCM, combined with a schlieren imaging system and multidimensional visualization methods, the problem of non-invasive, real-time, and quantitative observation of transient thermal convection fields inside the SBS-PCM was solved, achieving high spatiotemporal resolution thermal convection field measurement and device optimization.

CN122329622APending Publication Date: 2026-07-03HEBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEBEI UNIV OF TECH
Filing Date
2026-04-07
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing technologies make it difficult to perform non-invasive, real-time, and quantitative observations of the internal transient thermal convection field of SBS-PCM under actual working conditions, especially under strong pump laser background noise, making it difficult to effectively extract weak detection signals.

Method used

By employing the schlieren method, the probe light and pump light are set to propagate collinearly within the medium pool. The schlieren imaging system receives the probe light carrying refractive index gradient information in real time, and the data is processed using multidimensional visualization methods to comprehensively reveal the intensity, morphology, and directional characteristics of the thermal flow field.

Benefits of technology

It enables non-invasive full-field measurement of the internal thermal convection field of SBS-PCM, improves the signal-to-noise ratio, captures transient thermal convection processes on the order of microseconds, provides quantitative observation methods, and supports device optimization.

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Abstract

This invention relates to a device for real-time observation of laser-induced thermal convection within a SBS-PCM based on schlieren imaging, belonging to the field of optical laser measurement technology. It addresses the problem of existing technologies being unable to perform non-invasive, real-time, and quantitative observation of transient thermal convection fields within SBS-PCMs. The invention comprises: a pump source, an energy adjustment system, an optical isolation system, a beam separation system, a reflection focusing system, a probe source, a beam expander and collimator system, an SBS phase conjugate mirror, and a schlieren imaging system. The beneficial effects of this invention are: by designing the probe light and pump light to propagate collinearly within the dielectric cell, the schlieren imaging system and the pump source are synchronized for triggering, enabling real-time reception of probe light carrying refractive index gradient information. Combined with multi-dimensional visualization methods, the data is processed in real time, comprehensively revealing the intensity, morphology, and directional characteristics of the thermal convection field.
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