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Leak detection of vehicle cabin interiors is an important quality inspection phase that typically has been handled with various time consuming, or potentially product damaging techniques. Leak detection in tank or pressure vessel applications is almost always a concern for gas or fluid containment in vehicles and in many other industries. Numerous techniques exist for the detection of leaks in these and other types of structures. When testing is required in a production environment, often the speed of leak detection is very important if all samples must be tested. The use of several ultrasound based methods for leak detection in vehicle cabins and pressure vessel applications is presented here. Ultrasound waves are typically classified as having spectral content greater than 20 kHz. In the case of leak detection in a production environment, frequently the ultrasonic spectrum is largely free from background noise content that dominates the audible spectrum.

Gauge R&R (GR&R), as defined through Measurement Systems Analysis (MSA), has long been an accepted technique to validate the consistency of a measurement system (gauge), whether it is in the lab or used in end of line (EOL) applications. The analysis process, defined by Automotive Industry Action Group (AIAG), is typically applied to an attribute that is inherently stable and repeatable, and a measurement process that is just as robust and single valued, e.g. measuring the diameter of a part with a caliper. In the world of NVH, the parts are stable and the measurement system is robust; however, the measured results are not as repeatable as desired due to the nature of the system. In the NVH realm, the results are typically multi-value, e.g. an order slice vs. RPM. How is a traditionally single value process applied to a multi-value result, pick 1 point? An additional challenge to the traditional MSA analysis is that it requires a linear amplitude relationship of the measured result.