Psv 500

Manufactured by Polytec

Sourced in Germany

The PSV-500 is a laser scanning vibrometer, a device used for non-contact measurement of vibrations on surfaces. It employs a laser to detect the motion of a target surface and provides detailed data on the vibration characteristics of the measured object.

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Lab products found in correlation

Pdv 100, by Polytec (1 mentions)

Spelling variants of this product

PSV-500-3D (2 citations)

5 protocols using psv 500

Scanning Laser Vibrometry of Facial Surface

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An LDV is an optical transducer that applies a laser beam to a vibrating surface and measures the frequency shift of the laser beam reflected from the surface. It can determine the vibration velocity and displacement at any point on the surface based on the Doppler effect. A scanning LDV can automatically scan and probe multiple pre-selected points on an object's surface and obtain their vibration patterns, while a single-point LDV can only measure vibrations at a single point.
In this study, we employed a scanning LDV, Polytec PSV-500, to measure facial surface vibration velocities. The system consisted of a scanning head that applied and received the laser beam, a controller, and software for acquiring and displaying the measured data. Figure 1 shows the hardware of the system. The diameter of the laser beam, defined as the width at which the intensity of the laser beam is 13% of the value at its center was less than 100 μm.

Kitamura T, & Ohtani K. (2015). Non-contact measurement of facial surface vibration patterns during singing by scanning laser Doppler vibrometer. Frontiers in Psychology, 6, 1682.

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Laser Safety in LDV Experiments

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The scanning LDV, Polytec PSV-500, employs a class-II helium-neon laser (the wavelength is 633 nm), which could cause injury if a person were to gaze into the laser beam. To protect the participants' eyes from the laser emission during the experiments, we first asked them to wear swimming goggles covered by lightproof fabric tape; however, without vision, it was difficult for the participants to stabilize their heads and unsteadiness of a measured object directly decreases the resulting LDV measurement accuracy. Thus, in the present study, we covered the swimming goggles with 3-mm-thick laser safety filters (Riken Optech, RLF-He), which could filter out the helium-neon laser beam but did not deprive the participants' vision.

Kitamura T, & Ohtani K. (2015). Non-contact measurement of facial surface vibration patterns during singing by scanning laser Doppler vibrometer. Frontiers in Psychology, 6, 1682.

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Vibration Measurement of Plants via SLDV

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Vibration velocities on the plant were measured using a scanning laser Doppler vibrometer (SLDV, PSV-500 Polytec Inc., Irvine, CA, USA) at distances between 1 and 50 cm from the mini-shaker attachment point (Fig. 2a). The trigger signal was generated internally with averaging set to three scans per point. In addition, a second single-point laser Doppler vibrometer (PDV-100, Polytec Inc., Irvine, CA, USA) was aimed at the mini-shaker attachment point on the grapevine. Both vibrometer outputs and the trigger signal were recorded simultaneously on separate channels of a laptop computer.

Gordon S.D., Tiller B., Windmill J.F., Krugner R, & Narins P.M. (2019). Transmission of the frequency components of the vibrational signal of the glassy-winged sharpshooter, Homalodisca vitripennis, within and between grapevines. Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology, 205(5), 783-791.

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Laser-Induced Tympanic Membrane Vibration

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We explanted the temporal bones, removed the cartilaginous outer ear canal and exposed the tympanic membrane (TM). To improve the signal to noise ratio (SNR), we placed micron sized glass beads (Ø 50 µm/bead) on the TM. With a custom-made holder we fixed the head, inserted the laser fiber into the outer ear canal and directed it towards the TM. For the vibration recordings in response to the laser stimulation, we placed a scanning laser Doppler vibrometer PSV 500 (Polytec GmbH, Waldbronn, Germany) (LDV) at a distance of 20 cm from the TM. Using the built-in camera of the LDV, the TM could be displayed on the monitor, the measured points were visualized and the recordings could be monitored and controlled (Fig. 2a). In order to obtain an adequate SNR, the scan points had to be set exactly on the reflective glass beads.

Stahn P., Lim H.H., Hinsberger M.P., Sorg K., Pillong L., Kannengießer M., Schreiter C., Foth H.J., Langenbucher A., Schick B, & Wenzel G.I. (2019). Frequency-specific activation of the peripheral auditory system using optoacoustic laser stimulation. Scientific Reports, 9, 4171.

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Measuring Insect Wing Biomechanics

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The resonant frequency (f_o) and deflection patterns of the forewings was measured in the holotype of P. obscura using micro-scanning LDV (PSV-500, Polytec GmbH, Waldbronn, Germany), with approximately 1000 measuring points at a sampling frequency of 256 kHz. Acoustic signals for wing excitation were generated by the LDV internal data acquisition board (PCI-4451; National Instruments, Austin, TX, USA), and consisted of broadband periodic chirps ranging from 1 to 60 kHz at 60 dB SPL (re 20 μPa). The signal was amplified by a Pioneer A-400 amplifier (Pioneer, Kawasaki, Japan) and transmitted to a loudspeaker (Vifa, Avisoft Bioacoustics, Glienicke, Germany; flattened frequency response across the whole range) positioned 20 cm in front of the specimen. A reference signal to calculate the transfer function between the wing vibration and the stimulus was recorded using a 1/8” condenser microphone positioned horizontally at the wing plane between the wings (Model 4138-A015, Brüel & Kjaer, Nærum, Denmark). For further details of method, see [18 (link)].

Woodrow C., Baker E., Jonsson T, & Montealegre-Z F. (2022). Reviving the sound of a 150-year-old insect: The bioacoustics of Prophalangopsis obscura (Ensifera: Hagloidea). PLoS ONE, 17(8), e0270498.

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