Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Pierre H. Brodeur"'
Autor:
Joseph Peter Gerhardstein, Pierre H. Brodeur, Emmanuel Lafond, Kenneth L Telschow, Charles C. Habeger
Publikováno v:
Ultrasonics. 40:1019-1023
Photorefractive interferometers have been employed for the detection of ultrasound in metals and composites since 1991 [1–4]. Instances of laser-generated ultrasound and laser-based detection in paper were reported in 1996 [5]. More recently, bismu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20846ff9351d64377a92ac62825d1c47
https://doi.org/10.1016/s0041-624x(02)00252-4
https://doi.org/10.1016/s0041-624x(02)00252-4
Publikováno v:
Ultrasonics. 34:703-710
Experiments have been conducted to study the generation of ultrasonic Lamb waves in copy paper using a pulsed Nd : YAG laser. The signals were detected with an out-of-plane heterodyne Ar+ laser interferometer. The effect of the generation laser spot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5af4a1661b1591fbf17f4cc7dec88834
https://doi.org/10.1016/0041-624x(96)00068-6
https://doi.org/10.1016/0041-624x(96)00068-6
Publikováno v:
The Journal of the Acoustical Society of America. 94:2215-2225
A through‐transmission, dry‐contact ultrasonic technique aimed at investigating sound propagation in the thickness direction of paper materials is presented. The method uses piezoelectric ceramic transducers immersed in fluid‐filled rubber whee
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71bafab92a3bd8e405aaedcecc18dc06
https://doi.org/10.1121/1.407492
https://doi.org/10.1121/1.407492
Publikováno v:
1996 IEEE Ultrasonics Symposium. Proceedings.
The use of a laser ultrasonics method to induce and detect Lamb waves in paper was demonstrated. A pulsed Nd:YAG laser was used for Lamb wave excitation. Detection of out-of-plane and in-plane surface motions was accomplished using a CW Ar:ion laser
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::099b9c3dc0afbd8b364f60d7a689c136
https://doi.org/10.1109/ultsym.1996.584170
https://doi.org/10.1109/ultsym.1996.584170
Publikováno v:
1998 IEEE Ultrasonics Symposium. Proceedings (Cat. No. 98CH36102).
The pulp and paper industry encompasses a broad range of processes from wood harvesting to debarking, pulping, bleaching, papermaking, and converting operations. In relation to these processes and others, several uses of ultrasonics have been investi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::623a625413a38ad3c1663021e9e48b4c
https://doi.org/10.1109/ultsym.1998.762268
https://doi.org/10.1109/ultsym.1998.762268
Autor:
Joseph Peter Gerhardstein, Pierre H. Brodeur, John B. Walter, Charles C. Habeger, Brian M. Pufahl, Kenneth L. Telschow, E. M. Lafond
Publikováno v:
AIP Conference Proceedings.
On-line measurement of material properties is a goal of many manufactures for production improvement and quality control. In the paper industry, the elastic stiffness of the paper web needs to be accurately measured and controlled online. Currently,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7575a2840d3199ed7796dc1841ac6974
https://doi.org/10.1063/1.1306058
https://doi.org/10.1063/1.1306058
Autor:
Pierre H. Brodeur, G.D. Bacher, Marvin B. Klein, Emmanuel Lafond, Bruno F. Pouet, Brian M. Pufahl
Publikováno v:
SPIE Proceedings.
Stiffness properties of paper materials can readily be characterized in the laboratory using conventional ultrasonic techniques. For on-line inspection on a paper machine, due to the high translation velocity and the somewhat fragile nature of the mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50134b7cc55bc97a2351de4b6d6f50d3
https://doi.org/10.1117/12.339961
https://doi.org/10.1117/12.339961
Publikováno v:
SPIE Proceedings.
Laser-Based Ultrasound (LBU) systems are now entering their maturity years by penetrating the factory in both the areas of non-destructive testing and process control. A LBU system can be used for the on-line characterization of a paper web in a pape
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50b360d1b29372171a861c5946c81c59
https://doi.org/10.1117/12.339967
https://doi.org/10.1117/12.339967
A new ultrasonic technique aimed at simultaneously measuring the thickness and sound transit time in paper materials is presented. Two 1 MHz piezoelectric ceramic transducers immersed in water-filled rubber wheels are used to launch and receive signa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::759ce06a4fbc5e81e9c5cc71cb11e783
https://doi.org/10.1016/b978-0-7506-0389-8.50076-7
https://doi.org/10.1016/b978-0-7506-0389-8.50076-7
Publikováno v:
The Journal of the Acoustical Society of America. 100:686
A system for relatively accurately measuring the velocity and time of flight of ultrasonic signals in the thickness direction through moving web-like materials, such as paper, paperboard and the like, includes a pair of ultrasonic transducers dispose
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7683202406c79f1f8f20ab6fbd09f393
https://doi.org/10.1121/1.416263
https://doi.org/10.1121/1.416263