What are reference reflectors used for in PAUT?

Reference reflectors play a crucial role in Phased Array Ultrasonic Testing (PAUT) as calibration standards for sensitivity verification. They are specifically designed to provide a known response that can be used to set the detection capabilities of the ultrasonic system. By utilizing these reflectors, a technician can compare the response from the reflector to the echoes received from any test piece, ensuring that the system is functioning correctly and is sensitive enough to detect flaws of a known size and type.

This process not only verifies the system's capabilities but also allows operators to understand the effectiveness of their setup, including the transducer's characteristics and the overall system performance. In essence, reference reflectors ensure the accuracy and reliability of the testing results, which is vital in quality control and integrity assessment of components in various industries.

The other choices do not accurately describe the primary function of reference reflectors in PAUT, highlighting their specific calibration role. Blocking ultrasonic waves is not part of their function, nor do they directly improve image resolution or measure the impact of temperature on materials. Each of those aspects pertains to different aspects of ultrasonic testing or materials testing, rather than the specific calibration processes facilitated by reference reflectors.