Join our journey and experience, where portable laser Doppler vibrometry solves biological studies and where it enables inspections of machinery regarding acoustics, vibration, and dynamics. We have been looking for applications of portable laser vibrometry all over the world and have found the most exciting studies and measurement tasks. Also learn about VibroGo® as the new laser vibration sensor for field studies with integrated data recording and on-board monitoring.
Truly portable laser vibration measurement
This portable vibration sensor measures acoustics, dynamics, and vibration with laser precision and directly displays the measurement data in the time and frequency domain. VibroGo® even allows on-board analysis in the field, while covering a wide frequency range of up to 320 kHz. Its outstanding resolution, with high linearity across the entire frequency range provides a handy precision analysis tool for field studies. Use VibroGo® for a better understanding of dynamics and acoustics in nature and technology – for research, product development and quality assurance.
Join us on our journey: From biology to industry, from small insects to large machinery and buildings - we have searched for applications of portable laser vibrometry all over the world and have found the most exciting measurement tasks and studies. With each week, this site is going to publish another story. Stay tuned and be inspired.
How portable vibrometry kept the clearance crews safe
In order to protect the clearance crews during rescue operation of the World Trade Center on 9/11, building 4 was monitored with portable vibration sensors from Polytec. Professor Jim Sabatier's dynamic measurements were of great support of the assessment of the collapse hazard during rescue missions. See the reprinted original article by Dr. Sabatier, providing details about the metrological implementation of laser-based stand-off condition monitoring and vigilating the structural integrity.
Article Vibration sensing at Ground Zero
Understanding insect communication for pest control
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 California and South America, which costs the Californian economy alone around 104 million USD every year. In a unique research project, scientists analyzed the courtship communication of insects as vectors like the glossy winged sharpshooter, a small cicada species measuring approximately 1 cm, with the aid of optical laser vibration measurement. They found a new method of pest control that has no adverse affects on the ecosystem, unlike existing measures such as the use of pesticides. This creates hope and optimism for farmers in Europe, where the bacterium has been spreading since 2013.
Remote inspection in hazardous areas
Access even for expert staff can be difficult when working in hazardous industrial environments. Here, the possibility of taking a very close look on test structures with a laser from a safe distance can be a crucial argument. Noise analysis e.g. on condensors, machine parts and more can be conducted with a VibroGo® portable laser vibration sensor. With environmental excitation through the wind, technical systems in the open space can reveal much about their condition. The detected movement of the structure under test is useful to study and check power plants or technical installations, look for loose parts or detached joints, worn gear wheels, pumps or fans and monitor condition, or indicate that maintenance or exchange is due.
- Measure structure-borne noise and vibration from a safe distance up to 30 m with a laser
- On-board data recording and analysis
- Detect vibro-acoustic signature on a large frequency bandwidth from DC to 320 kHz
Condition monitoring in industrial plants
Production quality in industrial manufacturing processes highly depends on reliable and reproducible machining processes such as grinding, drilling, milling or cutting. For calibration or potential failure analysis, portable laser vibrometers like the VibroGo® allow an entirely remote inspection from comfortable and safe distances, measuring the out-of-plane motion of the milling head, analyzing the noise on pumps and compressors and more. Here, the laser sensors reliably detect noise on a wide frequency bandwidth, monitors the components condition for a flexible and simplified preventive maintenance.
Listening to the songs of cicades
The planthopper (lat. Hyalesthes obsoletus) is a species, that represents a vector of a plantdisease in vineyards and therefore of scientific and economic interest. Cicadas, leafhoppers, planthoppers, and spittlebugs (also called Auchenorrhyncha) are a very diverse group of animals within the insect world. Nevertheless, relatively little is known about their behavior and phylogeny. Vibrational signals play an important role in species recognition and mating behavior. Here, the use of laser vibrometer is extremely helpful. Laser vibrometer measurements and complementary microphone recordings show a clear vibrational signal from a maleplanthopper. The below signal shows simultaneously recordedairborne sound close to the animal, transmitted through the host plant.
Article Measuring insect communication with laser vibrometers
Unveiling secret sounds
In their long-term project Unveiled Presence (secret sounds), the artist duo Natalie Bewernitz and Marek Goldowski explore characteristic sounds and hidden acoustic peculiarities in known and unknown places of the Finnish capital Helsinki. The project makes use of the sound library of laser Doppler vibrometer recordings made in Helsinki in May 2010. A laser Doppler vibrometer can convert solid-state vibrations into a digital audio signal through a light beam and functions as an extremely focused accelerometer, similar to a very long cardioid microphone. Video recordings made of the vibration points were acoustically recorded, thus forming a visual reference to the sound. Based on this library of audio-visual recordings, a single-channel video composition that visualizes the site-specific sound character and seasonal changing of light in the city was developed.