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Term Definition
Acoustic sensor
The acoustic sensor is a sensor which is able to receive, analyze and interpret both body and airborne sound signals. On the basis of these data, the sensor can perform various switching operations for example monitoring of machines, plants and tools.

Acoustic testing
Inspection on the basis of acoustic testing methods for use in acoustic testing technology

Acoustic testing technology
Testing technology based on acoustic methods which can perform the monitoring of quality parameters in assembly and production plants. Through the evaluation of the recorded sound signals on changing parameters the production process can be influenced.
Acoustical quality assurance
Acoustical sorting of small components
The acoustical sorting of small components is based on the resonance analysis from natural frequencies of mechanical structures. Thereby a frequency measurement (resonances) of the emitted sound signals is performed after an impulse-like stimulation of the test object. This frequency spectrum is compared with already trained sound patterns for sorting components. As a result of this comparison a directly good / bad statement is generated to discharge faulty parts.
Acoustics are dealing with the generation and propagation of sound and its technical applications. It describes the propagation of mechanical vibrations and waves in solid, liquid and gaseous media.
Airborne sound, structure-borne sound
There are two different types of sound signals: airborne and structure-borne noise.
For airborne sound, the sound spreads through the medium air. For structure-borne sound, the sound waves spread in solids.

Cavities is a term used in metallurgy. It means a cavity which is formed during the solidification of molded parts. These cavities are usually undesirable and can occur inside the workpiece (internal cavities, closed cavities) or visible at the surface (open cavities).
Compact sensor
Please see "Intelligent sensor"
Frequency analysis
Frequency analysis examines how often certain events occur within a certain time period or how much specific frequency components are present in a signal.
Function test
Monitoring of the operation of a facility or equipment with regard to the provisions, without recourse to special measurements. Verification whether products and systems provide their services in accordance with their specifications.
Intelligent sensor
An intelligent sensor is a sensor which combines besides the actual measured values, also the complete signal conditioning and signal processing in a case.

Material testing
The material testing is used for quality control and assurance. It is checked if a produced lot of preliminary, intermediate or finished products corresponds to the required quality standard.

Noise test
Please see „Acoustic testing

Production monitoring
The production monitoring is used for material testing and also quality control and assurance.
Quality monitoring
Continuous monitoring and verification of the status of a unit and analysis of records to ensure that specified requirements are met.

Quality test
The quality test detects, if products and services comply with the specific predetermined parameters and characteristics. It is used to determine to what extent e.g. the product meets the quality requirements.

Real-time capable
If a system under all operating conditions can react properly and in time to all events that occur real-time capability is given.

Resonance analysis
The resonance analysis is the investigation of the resonance that occurs when a vibration-capable body is excited to vibrations by an applied periodic external force.
The self-resonance is the resonance behavior of a molecular based material. If it is triggered subjected to other external influence almost every material resonates at one or more specified frequencies. Specific self-resonance frequency depends on the form, weight and rigidity of the material.
Sound analysis
The sound analysis is a procedure whereby assemblies can be controlled while using their vibrational behavior or sound by the recording of body-or airborne sound.
The object that has to be tested is driven at idle or under load and the resulting body or airborne sound is captured. By a mechanical vibration a modified behavior or a change in sound signature is produced. Faultless test objectst hereby serve as a reference.

Sound detection
The term "sound detection" means the analysis and comparison of one or more frequencies with a given sound pattern.
Sound recognition
Different frequencies with no particular frequency ratio within a spectrum are recorded, analyzed and compared with reference samples as a nominal value.

Sound testing
The sound testing or analysis is a method of material testing for the detection of fissures as well as material and structural defects. The frequency spectrum includes frequencies in the audible and also in the ultrasonic range. The characteristic natural frequency of a rigid body is modified by material errors, so that the results of the measurements can be compared and evaluated with the previously learned vibrational behavior of fault-free components as the nominal value.

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