For the active membrane of an ESL ... is there an overall better alternative to Mylar? Therefore, any approach to tame the unwanted artefacts emerging from this type of film is welcome. My approach would be first to heoretically test for the effectness of each option in isolation from other influences. So a testbed such as the frame described in this test might be helpful also to test any damping measure. Instead, the complex structure of a perforated stator, partially meshed sandwich might have a masking effect. And then for the gut feeling? Every gastroenterologic specialist can tell you that guts have the potential to betray. And most people might tell from their own experience.
The dust cover films instead, as intended to be tested in this thread, have other properties to match than the active membrane. So obviously besides Mylar many other materials are used for this purpose. I am really eager to test my bunch of rolls by the time I will be ready to do so.
My delay has a simple cause: I have only a limited (=precious) quantity of film, and therefore I want to have the film sheets confectionned in a way that they can serve several times on the test frame, without being destroyed by having to be "torn" off. Furthermore, changing the films has to be quick, easy and reversible. This is why I want to first figure out the best way how to handle these different materials and tasks. An example: In order to test for the material properties of each sheet make in isolation from other influences, I want to hold the film in place and tension it by the four corners only for a first test series. All four borders of the sheet should be freely floating in ambient air, while a vast aera in the center should be reasonably and evenly tensionned. Tensionned from test to test always by more or less at the same, but also variable forces. So no taping to any frame. I want to avoid uncontrolled damping (which would be part of the "therapy"). No standing waves and the like. To figure out how to archieve these goals now turns out to be a more delicate process of trial and error than I imagined before. I e.g. already ripped twice a corner piece away from the Mylar 4.2 sheet while probing tensioning with different approaches to anchor the four stretcher strings into the Mylar sheet corner. But things seem to slowly settle in direction of a useable setup, in the end. All I have to do is to be patient also to myself ...
The dust cover films instead, as intended to be tested in this thread, have other properties to match than the active membrane. So obviously besides Mylar many other materials are used for this purpose. I am really eager to test my bunch of rolls by the time I will be ready to do so.
My delay has a simple cause: I have only a limited (=precious) quantity of film, and therefore I want to have the film sheets confectionned in a way that they can serve several times on the test frame, without being destroyed by having to be "torn" off. Furthermore, changing the films has to be quick, easy and reversible. This is why I want to first figure out the best way how to handle these different materials and tasks. An example: In order to test for the material properties of each sheet make in isolation from other influences, I want to hold the film in place and tension it by the four corners only for a first test series. All four borders of the sheet should be freely floating in ambient air, while a vast aera in the center should be reasonably and evenly tensionned. Tensionned from test to test always by more or less at the same, but also variable forces. So no taping to any frame. I want to avoid uncontrolled damping (which would be part of the "therapy"). No standing waves and the like. To figure out how to archieve these goals now turns out to be a more delicate process of trial and error than I imagined before. I e.g. already ripped twice a corner piece away from the Mylar 4.2 sheet while probing tensioning with different approaches to anchor the four stretcher strings into the Mylar sheet corner. But things seem to slowly settle in direction of a useable setup, in the end. All I have to do is to be patient also to myself ...