Characterization of laser-induced pressure transients by means of piezoelectric PVDF films

Stefan Lohmann; Andreas Olmes; Holger Lubatschowski; Wolfgang Ertmer

doi:10.1117/12.229541

10 January 1996 Characterization of laser-induced pressure transients by means of piezoelectric PVDF films

Stefan Lohmann, Andreas Olmes, Holger Lubatschowski, Wolfgang Ertmer

Proceedings Volume 2624, Laser-Tissue Interaction and Tissue Optics; (1996) https://doi.org/10.1117/12.229541
Event: BiOS Europe '95, 1995, Barcelona, Spain

Abstract

For an interpretation of pressure signals detected by piezoelectric PVDF-foils several parameters are of importance. These are for example pressure pulse duration and rise times, active area of the film and specifications concerning the high-frequency technique of the experimental setup. Using an input-resistance of 1 M(Omega) at the storage-oscilloscope leads to reflections of the signal which superimpose each other when reflected a second time at the foil. This might cause an apparent increase of the amplitude. The utilization of a longer cable allows a separation of each reflected pulse, but it causes the problem, that the cable's input- impedance approaches its characteristic impedance of 50 (Omega) . This will lead to a time derived signal as well as using 50 (Omega) as input-resistance at the scope. Therefore a direct measurement of short pressure transients requires a very short cable and an input-resistance of 1 M(Omega) . Otherwise the measured signal allows no proportional relation between pressure transient and measured voltage signal. In the latter case a frequency-dependent correction of the signal becomes necessary. This has been developed in this paper by means of Fast Fourier Transform algorithm. After correction in the frequency-domain the signal is transformed back into the time-domain.

Citation Download Citation

Stefan Lohmann, Andreas Olmes, Holger Lubatschowski, and Wolfgang Ertmer "Characterization of laser-induced pressure transients by means of piezoelectric PVDF films", Proc. SPIE 2624, Laser-Tissue Interaction and Tissue Optics, (10 January 1996); https://doi.org/10.1117/12.229541

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available