# A Low-Cost Non-Intrusive Method for In-Field Motor Speed Measurement Based on a Smartphone

> Research article (Sensors, 2021) · cited 11× · AI/ML

**Wikidata**: [openalex:W3176210725](https://www.wikidata.org/wiki/openalex:W3176210725)  
**Source**: https://4ort.xyz/entity/a-low-cost-non-intrusive-method-for-in-field-motor-speed-measurement-based-on-a-smartphone