Scanning Microwave Vibrometer: Full-Field Vibration Measurement via Microwave Sensing With Phase-Encoded Beam Scanning

Full-field and remote vibration measurements are highly desirable for various fields from the natural world to engineering. However, traditional techniques such as laser and vision-based approaches suffer from fundamental problems, especially in large-scale measurement and harsh environment adaptability. In this article, we develop a novel microwave sensing-based vibration measurement approach with fast phase-encoded synthesis beam scanning, creating a unique scanning microwave vibrometer (SMV). In SMV, we measure the vibration displacement under the sensing mechanism with coherently synthesized linear frequency-modulated continuous wave (LFMCW) radio signals. To this end, we establish the theoretical basis and extraction method of full-field vibration measurement with synthesis beam scanning, followed by the detailed procedures for performing the SMV method, which possesses an attractive capability of tricky coupling clutter elimination and remote vibration sensing. In addition, the main considerations of real-life measurement are deeply illustrated. Experimental results with various scenarios are provided to demonstrate the performance of the SMV method, offering a promising approach for contactless full-filed and remote vibration measurement.