W2L1 - Lecture 3 Sensors (RB).pdf
Proprioceptive sensors: These measure internal values of the system/robot itself, like joint positions, wheel speed, battery voltage, or motor temperature. They help the system understand its own state.
Exteroceptive sensors: These acquire information from the environment around the system, like cameras, rangefinders, or touch sensors. They help the system understand the outside world.
Active Sensors
Active sensors are devices that actively emit energy into the environment and measure the response or reflection of that energy.
Passive Sensors
Passive sensors are devices that detect and measure energy or signals that are naturally present in the environment, without emitting their own energy. This is in contrast to active sensors which emit their own energy into the environment.
The Nyquist frequency and aliasing are critical concepts that affect LIDAR sensor readings: