# Detecting the Void behind the Tunnel Lining by Impact-Echo Methods with Different Signal Analysis Approaches

> Research article (Applied Sciences, 2019) · cited 28× · AI/ML

**Wikidata**: [openalex:W2967140043](https://www.wikidata.org/wiki/openalex:W2967140043)  
**Source**: https://4ort.xyz/entity/detecting-the-void-behind-the-tunnel-lining-by-impact-echo-methods-with-different-signal-analysis-approaches