What is a key requirement for the installation of piezoelectric sensors on glass?

The correct choice highlights that piezoelectric sensors function effectively when they are installed on sheet glass due to the uniformity and consistency that this type of glass provides. Sheet glass has a relatively even surface and structural properties, which allow the sensor to detect vibrations or pressure changes accurately. This uniformity is essential for the sensor to generate reliable electrical signals in response to disturbances.

Using piezoelectric sensors on irregular or non-sheet glass might lead to inaccurate readings, as variations in the glass's thickness or surface texture could affect the sensor's performance. Therefore, having a smooth, consistent surface like that found in sheet glass is crucial for optimal sensor operation.