Optical sensors are devices that use light or electromagnetic radiation to detect and measure certain properties of their surroundings. These sensors utilize the interaction between light and the target material to gather information and convert it into a measurable output, often an electrical signal. Optical sensors can be found in various applications across different industries due to their sensitivity, accuracy, and non-intrusive nature.

Optical sensors offer advantages such as high sensitivity, fast response times, and the ability to measure remotely without physical contact. They play a crucial role in a wide range of fields, from industrial automation and environmental monitoring to medical diagnostics and scientific research.