A noise sensor, also known as a sound or acoustic sensor, is a device designed to detect, measure, and monitor sound levels or noise intensity in an environment. It senses acoustic waves generated by air vibrations and converts them into electrical or digital signals representing sound pressure levels, typically measured in decibels (dB).

Noise sensors operate using microphones or acoustic transducers that respond to changes in air pressure caused by sound. Advanced models include signal conditioning and processing capabilities to filter background noise, analyze frequency ranges, and provide accurate real-time sound level data. These sensors can be calibrated to comply with environmental and industrial standards, ensuring reliable and precise measurements.

Modern noise sensors are compact, energy-efficient, and capable of continuous monitoring, with many supporting real-time data transmission and integration with IoT platforms, environmental monitoring systems, or automated safety solutions.

Noise sensors are widely used in industrial workplaces, urban noise monitoring, smart buildings, transportation systems, and public spaces, helping to ensure regulatory compliance, worker safety, and improved environmental quality.