Answer:
Ultrasonic, infrared and rotation are the sensors and it is used in various robots applications specially in the radioactive power plant for fix various types of problems in it and also use to carry various radioactive substances.
These sensors are basically used in the robotic sensors that are use to provide the robot's signal condition in the environment.
In the robotics, we use Ardunio UNO that basically help sensors, computer and data logged for the communication.