Introduction
Active sensors are electronic devices that emit energy or signals toward a target and measure the response to detect, track, or analyze an object or environment. Unlike passive sensors, which only detect natural energy (like sunlight or heat), active sensors generate their own signal—such as light, sound, or radio waves—and analyze how it interacts with the environment.
These sensors are integral to applications in remote sensing, automotive systems, industrial automation, robotics, defense, and healthcare. Technologies like LiDAR, radar, sonar, and ultrasonic sensors are examples of active sensors that have revolutionized data collection and object detection systems.
What Is an Active Sensor?
An active sensor operates by emitting a form of energy (e.g., electromagnetic radiation, sound waves, or laser pulses) and then detecting the reflected, refracted, or absorbed signal. This feedback provides detailed information about distance, speed, size, shape, or composition of the target object.
Basic Working Principle
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