This book is a textbook designed for vocational college courses on sensor technology. It systematically introduces the fundamental principles, common types, and applications of sensors, covering temperature, force and pressure, flow and velocity, displacement and motion, grating, gas composition, humidity, and other types of sensors. It also explores the applications of emerging sensors. Adopting a “project-based, task-driven” teaching approach, the textbook is complemented by digital resources such as micro-lectures and presentation materials. It aims to cultivate high-quality skilled professionals who can meet the needs of the industry, and is suitable for teaching and vocational training in related fields such as automation, mechatronics, and electronics.