Sensors for checking whether there is any dirt on the floor

[Hareesh Venkatraan]

Hello guys. Is there any sensors to check if the floor is dirty.For Example, the roomba room cleaner bot uses Piezoelectric sensor to check if the floor is dirty. What other sensors can be used for this same purpose?

Thank you.

 

[berkeman]

Hello guys. Is there any sensors to check if the floor is dirty.For Example, the roomba room cleaner bot uses Piezoelectric sensor to check if the floor is dirty. What other sensors can be used for this same purpose?

Thank you.

Can you define dirty? (like particle density, particle size, presence of bacteria...) What is the application? Is this question for schoolwork?

 

[Hareesh Venkatraan]

Can you define dirty? (like particle density, particle size, presence of bacteria...) What is the application? Is this question for schoolwork?

any particles on the floor,like sand,dust,etc,. It is for a room cleaner ,which cleans if it detects dirt/dust.