Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | Proceedings of SPIE |
| Untertitel | The International Society for Optical Engineering |
| Herausgeber/-innen | Guy P. Delacretaz, Rudolf W. Steiner, Lars O. Svaasand, Hans J. Albrecht, Thomas H. Meier |
| Seiten | 83-92 |
| Seitenumfang | 10 |
| Publikationsstatus | Veröffentlicht - 1996 |
| Veranstaltung | Laser-Tissue Interaction and Tissue Optics 1995 - Barcelona, Spain Dauer: 12 Sept. 1995 → 16 Sept. 1995 |
Publikationsreihe
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Band | 2624 |
| ISSN (Print) | 0277-786X |
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 ω 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 ω. This will lead to a time derived signal as well as using 50 ω 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 ω. 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.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Informatik (insg.)
- Angewandte Informatik
- Mathematik (insg.)
- Angewandte Mathematik
- Ingenieurwesen (insg.)
- Elektrotechnik und Elektronik
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- BibTex
- RIS
Proceedings of SPIE : The International Society for Optical Engineering. Hrsg. / Guy P. Delacretaz; Rudolf W. Steiner; Lars O. Svaasand; Hans J. Albrecht; Thomas H. Meier. 1996. S. 83-92 (Proceedings of SPIE - The International Society for Optical Engineering; Band 2624).
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Aufsatz in Konferenzband › Forschung › Peer-Review
}
TY - GEN
T1 - Characterization of laser-induced pressure transients by means of piezoelectric PVDF films
AU - Lohmann, Stefan
AU - Olmes, Andreas
AU - Lubatschowski, Holger
AU - Ertmer, Wolfgang
PY - 1996
Y1 - 1996
N2 - 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 ω 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 ω. This will lead to a time derived signal as well as using 50 ω 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 ω. 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.
AB - 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 ω 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 ω. This will lead to a time derived signal as well as using 50 ω 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 ω. 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.
UR - http://www.scopus.com/inward/record.url?scp=0029732883&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0029732883
SN - 0819419885
SN - 9780819419880
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 83
EP - 92
BT - Proceedings of SPIE
A2 - Delacretaz, Guy P.
A2 - Steiner, Rudolf W.
A2 - Svaasand, Lars O.
A2 - Albrecht, Hans J.
A2 - Meier, Thomas H.
T2 - Laser-Tissue Interaction and Tissue Optics 1995
Y2 - 12 September 1995 through 16 September 1995
ER -