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The tension of a frame mounted membrane can be determined by a system which measures the tension in the following manner.
English (United States)
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Dynamic Tension Measurement System
The tension of a frame mounted membrane can be determined by a system
which measures the tension in the following manner.
As seen in the drawing, a membrane 1 is mounted on a frame 2. The
membrane is exited by a selected driver, e.g., a turbulent air stream or a
speaker. The vibration of the membrane is measured by either a microphone or
by a fiber-optic probe which relays the signal to a signal analyzer. A signal
analyzer capable of performing fourier transformations is used to determine the
resonance frequency of the lowest mode of vibration of the membrane.
Assuming the mass density remains constant, the membrane tension is
proportional to the square of the resonance frequency.
The frame is clamped at three points to eliminate frame motion.