Amplitude and frequency as key indicators for quality control
Optical measurement technology helps ensure the quality of acoustics and vibration characteristics both in development and on the production line. Laser vibration measurement technology measures amplitudes independently of frequency, quickly and reliably. Scanning vibrometry, in particular, allows area-based and non-contact amplitude measurement and is commonly used in research and product development for FE model validation, prototype testing or design optimization. However, it can also be used to derive suitable measurement points for a subsequent targeted 100% inspection in production in order to reliably detect rejects in production. Scanning vibrometry is also an efficient production measurement technique when multiple measurement points or the full-field amplitude distribution need to be checked.
Measuring vibration amplitudes on a large frequency bandwidth, also as a service?
Measuring vibration amplitudes in development and production
There are wanted and unwanted vibrations. These are characterized by their amplitude distribution over the frequency range and form a component-specific vibroacoustic signature: In modern control and operating panels, haptic feedback is based on a specific distribution of vibration amplitude and vibration frequency; in ultrasonic welding in production lines in the packaging industry, amplitude and frequency determine the quality of the joining and ultrasonic welding process; or in loudspeakers, amplitude and sound are closely linked because they all depend on the exact vibration amplitude and propagation on a sample surface. Manufacturers of consumer goods, infotainment hardware, medical technology or precision engineering components face the same challenge: they want to measure the vibration amplitudes in the product over the entire surface of the sample, scan the vibration frequency step by step, control the desired vibration amplitudes and, on the other hand, minimize the amplitudes of unwanted vibrations in the acoustic frequency range.
Optical metrology for measuring amplitude & frequency
Full-field, broadband scanning of vibration amplitudes using laser interferometry
Optical and areally full-field measuring laser vibrometry as non-contact measuring technology has long been established in engineering departments. A laser sensor scans the entire surface of the product without contact nor influence on its dynamic behaviour, thus mapping the amplitude distribution on an entire frequency bandwidth with the highest precision. Desired and undesired vibrations are measured and visualized directly over the entire surface - with a single vibration sensor. A quality assurance system then classifies the product based on the reliable measurement data of the amplitude distribution. This is where Polytec's single-point laser vibration sensors and Scanning Laser Vibrometers contribute to quality control, offering flexibility, ease of use and short testing times.
Measuring structure-borne noise and vibration amplitudes for quality control
Related products
IVS-500 Industrial Vibration Sensor
The IVS-500 Industrial Vibration Sensor is key to fast and non-contact vibro-acoustic quality inspection, structure-borne noise analysis and reliable pass-fail decisions. Its robust and compact design enables a smooth integration into process control systems for inline and production testing, whenever requiring short cycle times like for EOL tests. The sensor is wear-free avoiding expensive servo-mechanisms or noise protection cabins.
VibroOne
The laser Doppler vibrometer VibroOne® is the one-box solution for non-contact vibration measurement. It is specifically designed for tightly packed setups, whether in research laboratories, challenging production environments or for non-contact analysis of tiny details on microstructures or biomedical probes. The optional inline HD+ camera helps positioning the laser precisely and provides proper test documentation.
PSV QTec Scanning Vibrometer
PSV QTec Scanning Vibrometers take full-field vibration mapping to the next level with unrivalled optical sensitivity! Their innovative, patented QTec® technology uses multi-path interferometry based on infrared (SWIR) laser granting high-fidelity measurements on all surfaces. PSV QTec significantly reduce testing time - especially on dark, biological, rotating or moving objects, determining operational deflection shapes and Eigenmodes for NVH, acoustics, structural dynamics, ultrasonics, FEM validation and NDT.
Further applications
- Actuators and drives
![Production testing of electric drives using in-line laser vibration measurement]( "Production testing of electric drives using in-line laser vibration measurement")
Production testing of electric drives using in-line laser vibration measurement - White goods
![Production testing on white goods, using laser vibration sensors for automated quality inspection]( "Production testing on white goods, using laser vibration sensors for automated quality inspection")
Production testing on white goods, using laser vibration sensors for automated quality inspection - Injection valves
![Production testing and quality control of fuel injectors with laser vibrometers]( "Production testing and quality control of fuel injectors with laser vibrometers")
Production testing and quality control of fuel injectors with laser vibrometers - Medical devices
![Production testing with industrial laser vibrometers on membranes in medical technology]( "Production testing with industrial laser vibrometers on membranes in medical technology")
Production testing with industrial laser vibrometers on membranes in medical technology - Engine cold test
![Non-contact vibration measurement as end-of-line production testing]( "Non-contact vibration measurement as end-of-line production testing")
Non-contact vibration measurement as end-of-line production testing
