# An investigation on bolt stress ultrasonic measurement based on acoustic time difference algorithm with adaptive hybrid extended Kalman filter

> Research article (Measurement, 2021) · cited 28× · AI/ML

**Wikidata**: [openalex:W3203359472](https://www.wikidata.org/wiki/openalex:W3203359472)  
**Source**: https://4ort.xyz/entity/an-investigation-on-bolt-stress-ultrasonic-measurement-based-on-acoustic-time-difference-algorithm-with-adaptive-hybrid-