ポリテック・マガジンに掲載された「バイブロメトリー」
Gravity in the Lab
Anyone wanting to measure G needs an experimental setup capable of the seemingly impossible—detecting movements smaller than the diameter of an atom, triggered by pure “action at a distance.” The team arou…
Decrypting the machine physics with the 3D laser Doppler vibrometer
Feeding technology is a key process in automated production. In order to develop feeding systems using simulation, the machine’s physics must be known. As a specialist in feeding technology, the RNA Group …
Laser-Doppler-Vibrometer set standards in the development of electric drives
Electric machines are increasingly being used as the primary drive technology in vehicles. The acoustic behavior of the drive is a key factor in the perceived quality of electric vehicles. Numerical method…
For more efficient quality control
The automation of production control and the associated measurement processes and evaluations are a central topic in modern manufacturing technology. They relieve the burden of routine work and make produc…
Optimized manufacturing processes for optical free-form surfaces
The use of optical free-form surfaces allows complex lens systems to be simplified and thus made more compact and weight-optimized. In addition, the use of optical freeform surfaces enables the realization…
On self-supporting and self-aligning compact shakers
Artificial excitation is the basis for various noise and vibration techniques, from experimental modal analysis, over transfer path analysis, load identification, simulation model correlation, hybrid model…
Focus on impact detection of micrometeorites
The commercialization of space exploration increases the need for innovative technologies for space and planetary exploration and satellite missions. To ensure the safety and reliability of space structure…
Laser vibrometer based acoustic performance evaluation from -40° to 85°C
The increase of touchscreen interfaces in automotive applications leads to a visual overload of information that has serious safety implications. Haptic feedback technology is seen as an opportunity to imp…
Inertial shakers for modal testing
If you would like to test the vibration behavior of an object that is not vibrating by its own, you have to excite it externally. For modal tests both an electromagnetic shaker and a modal hammer are commo…
How to measure low-frequency acoustic communication of African elephants
A recent study published in the European Physical Journal Special Topics introduces a pioneering application of laser Doppler vibrometry (LDV) to better comprehend African elephant vocalizations and their …
How singing capacitors affect the audio experience in consumer electronics
Everybody enjoys good sound quality on a mobile device when watching a show or when communicating with friends and family or in a business environment. On the other hand, we cringe when something is off wi…
When to choose a laser Doppler vibrometer for vibration measurement
In the realm of vibration testing, a significant obstacle arises in the form of mass loading. The behavior of a dynamic vibration sample, or device under test (DUT), is profoundly influenced by the additio…
Single electrode transduction of contour modes in piezoelectric disk resonators
Piezoelectric disk resonators are designed to transduce specific contour mode bulk acoustic wave (BAW) resonant shapes. Utilizing a unique property of lead magnesium niobite-lead titanate (PMN-PT) thin fil…
How shear shock waves influence perception
Haptic holography or mid-air haptics promises to bring virtual reality to life, but a new study reveals a surprising physical obstacle that will need to be overcome. A research team at UC Santa Barbara has…
LDV based displacement sensor AFM enables more quantitative measurements
Atomic Force Microscopy (AFM) is a powerful and versatile nanoscale imaging technique that has revolutionized our understanding of surfaces and materials at the atomic and molecular scale. By enabling high…
Celebrating the iconic career of Professor Rong Z. Gan
We had a chance to virtually sit down for an interview with Prof. Rong Zhu Gan. In her field, she is one of those personalities that needs no introduction. For the uninitiated, she is the George Lynn Cross…
Using toys to investigate the complex physics of quasi-periodic metamaterials
Metamaterials are artificial assemblies of known materials in particular arrangements that result in novel properties not encountered in naturally occurring materials. Among many applications, they hold gr…
Boundary conditions, measurement inaccuracy, and repeatability
MAN Energy Solutions offers a comprehensive engine portfolio, propeller, and stern equipment and turbochargers for the maritime sector. Reliability is an essential aspect of our sector and especially vital…
Observing cardiac fibrillation from a distance and yet close
Diseases of the heart and circulation are the most common cause of death - even before cancer! So we should pay a lot of attention to the health of the heart. But how? Everyone knows the rise of pulse when…
A modal-based monitoring system
More and more, the increasing stress on infrastructures provides the challenge of investigating and evaluating the existing structures with regard to safety and the resulting remaining useful life. Reliabl…
Non-contact alternative to dynamic and viscoelastic mechanical testing in cartilage
Osteoarthritis, a degenerative disease in the joint, is a condition that is afflicting approximately 14% of adults. Understanding the dynamics of the joint cartilage is crucial for research and for finding…
Frequency response function measurement using QTec® multi-path interferometry
The measurement of frequency response function (FRF) plays an important role for the dynamic characterization of structures. In most cases, the goal is the measurement-based analysis of a system or the det…
Analyzing operational deflection shapes on loudspeakers
Noise protection and control play a major role in both professional and private environments. Airborne sound measurements help identify acoustic paths as a means of noise reduction as standard testing meth…
Manipulation of complex fluids with SAW-based acoustofluidics
Surface acoustic wave (SAW)-based acoustofluidics combines microfluidics with active microacoustic fields. This allows to realize numerous Lab-on-a-Chip operations, reaching from fluid manipulation includi…
A new driving mechanism for acoustofluidics*
Acoustofluidics is the active manipulation of fluids as well as of immersed particles or cells at the micro- and nanoscale and is a key technology for life sciences. Acoustic waves, more precisely, ultraso…
Interview with Dr. Windmill about hearing of insects and laser vibrometry
Dr. Windmill from the University of Strathclyde in Glasgow examines the hearing of insects. We talked to him about his research and the role that Polytec‘s optical vibrometers play there.
Laser vibrometry visualizing haptic feedback
The smartphone has shown that buttons can be replaced without sacrificing comfort. The freely configurable display with gesture control has made it even easier to switch between applications. Hap2U drives …
Noise and modal analysis for quiet and reliable operation
The growth of the drone market is multi-faceted: growing concerns about national and border security drive the need for advanced aerial surveillance, package delivery services experience an increased deman…
Measurements using broadband piezoelectric excitation
The following article compares various forms of force excitation in order to determine the transfer admittances of mechanical systems using a gear wheel as an example. The objective is to analyze and asses…
Determining the dynamic characteristics of an aircraft’s large-scale, adaptive compliant wing slat section prototype
The SADE project studied “smart” morphing mechanical elements of next generation wings, which was aimed at improving aerodynamic performance, fuel efficiency, as well as reducing noise and emissions in all…
Acoustic radiation of vibrating surfaces in electric drive systems
The growing electric and hybrid vehicles market faces new demands on product acoustic quality. The acoustical emission behavior of electric drivetrains is clearly different from that of conventional drives…
Keep healthy teeth with ultrasonic scaler using EMS Piezon NO-PAIN technology
In order to keep your natural teeth as long as possible and to prevent caries and periodontal infections, home-care methods like brushing your teeth and flossing are essential. Unfortunately, these alone a…
Precision vibrometry on a self-excited, multi-cantilever MEMS structure
The excitation of a multi-cantilever MEMS structure by molecular Brownian motion is investigated by ultra-high resolution optical vibrometry. This novel approach to testing enables applications such as the…
Vibration analysis helps to protect art
To organize traveling exhibitions, museums like the Georgia O’Keeffe Museum in Santa Fe, New Mexico supplement their own collection with temporary loans from other museums and private collections. In 2017,…
In situ damping measurements of spider webs
Spider webs are naturally occurring structures with amazing and very distinctive architecture, mechanics and dynamics. To predict the vibration damping response of a complete spider web structure, the damp…
Experimental modal test with laser vibrometers
The validation of simulation models is an important application area of laser vibrometers. To do this, the geometric data from a finite element mesh is loaded into the software of the measurement system an…
FEM simulation and measurement validation of an ultrasound transducer
One of the workhorses of medical imaging is ultrasound imaging, often called (diagnostic) medical sonography. The advancement of transducer technology for creating the ultrasound waves is a very dynamic su…
3D scanning laser Doppler vibrometry for fuel-efficient turbines
Fuel consumption of aircrafts is a hot topic in the current discussion about global climate change. An important factor is the design of the aircraft engine itself. In order to reduce weight and build more…
Non-destructive measurements for determining the performance of a CMUT ultrasound transducer
Fuel consumption of aircrafts is a hot topic in the current discussion about global climate change. An important factor is the design of the aircraft engine itself. In order to reduce weight and build more…
Xtra 3D scanning vibrometry on rolling tires
Dynamic 3D operational deflection shapes captured with an Xtra Scanning Vibrometer help reveal the source of rolling tire noise. For a wide range of driving conditions, rolling tires stimulate a significan…
Investigating vibrations of the human auditory ossicles
The human middle ear transfers acoustically-induced vibrations of the eardrum through the ossicles to the inner ear. Near the auditory threshold, the resulting three-dimensional vibrational patterns have d…
Laser vibrometry is the key
The bacterium Xylella fastidiosa causes various serious diseases in a large number of crop plants. Among other things, the plant pathogen is responsible for a devastating disease in grape vines in Californ…
The role of vibrations in finding a mating partner in bees
In nature, females are often the choosy sex when it comes to finding a mating partner. In the red mason bee, Osmia bicornis, all the prerequisites for so-called female choice are given and we therefore inv…