Dynamic resistance vs temperature measurement for ribbon transducer

In summary: Frequency response is not necessary, but would be helpful. In summary, a ribbon transducer is a microphone and/or loudspeaker that uses current to create sound pressure. Resistance increases with temperature, which results in clipping of the waveform. I'd like to measure this effect.
  • #1
thadman
27
0
I'm interested in doing an experimental analysis of ribbon transducers to contrast with simulations. This data could be made available to the community to aid in transducer development.

A ribbon transducer consists of a rectangular element of metal foil suspended within a magnetic gap and clamped at its ends (ie a clamped-clamped membrane). Current is applied to the foil, which produces an electromagnetic field that interacts with the magnetic field generated by the permanent magnets. The foil bends in response to this force.

A modal analysis could be conducted with the use of a scanning laser vibrometer system. This would appear sufficient for the task.
http://www.polytec.com/usa/158_918.asp

A dynamic resistance vs temperature measurement of the foil would appear to be valuable. However, I'm not sure what instrumentation would be required or how to set up such an experiment.

Any thoughts?
 
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  • #2
thadman said:
I'm interested in doing an experimental analysis of ribbon transducers to contrast with simulations. This data could be made available to the community to aid in transducer development.

A ribbon transducer consists of a rectangular element of metal foil suspended within a magnetic gap and clamped at its ends (ie a clamped-clamped membrane). Current is applied to the foil, which produces an electromagnetic field that interacts with the magnetic field generated by the permanent magnets. The foil bends in response to this force.

A modal analysis could be conducted with the use of a scanning laser vibrometer system. This would appear sufficient for the task.
http://www.polytec.com/usa/158_918.asp

A dynamic resistance vs temperature measurement of the foil would appear to be valuable. However, I'm not sure what instrumentation would be required or how to set up such an experiment.

Any thoughts?

Could you please say a bit more about the practical applications that would use this type of sensor? Is it used in particle accelerators or plasma fusion confinement field measurements or something? Why does the temperature variable come into play? Is this sensor normally used for static field measurements, or does it have to have some frequency response capability?
 
  • #3
berkeman said:
Could you please say a bit more about the practical applications that would use this type of sensor? Is it used in particle accelerators or plasma fusion confinement field measurements or something? Why does the temperature variable come into play? Is this sensor normally used for static field measurements, or does it have to have some frequency response capability?

A ribbon transducer is used as a microphone and/or loudspeaker. Here is a diagram of a ribbon microphone: http://www.shurenotes.com/issue37/images/images/article1_13.gif

Assuming it is used as a loudspeaker, current is applied to the foil to create sound pressure. The loudspeaker is <10% efficient due to the poor membrane-fluid coupling, which results in a majority of the energy being converted to heat. Resistance increases with temperature, which results in clipping of the waveform. I'd like to measure this effect.
 
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Related to Dynamic resistance vs temperature measurement for ribbon transducer

1. What is dynamic resistance?

Dynamic resistance refers to the electrical resistance of a material or component that changes with the applied voltage or current. It is also known as small-signal resistance or incremental resistance.

2. What is temperature measurement for ribbon transducers?

Temperature measurement for ribbon transducers is the process of using temperature sensors to accurately measure the temperature of a ribbon transducer. This is important because the performance of ribbon transducers can be affected by temperature changes.

3. How does dynamic resistance change with temperature for ribbon transducers?

The dynamic resistance for ribbon transducers typically decreases as the temperature increases. This is due to the increase in thermal energy, which causes the resistance of the material to decrease.

4. Why is it important to measure dynamic resistance vs temperature for ribbon transducers?

Measuring dynamic resistance vs temperature for ribbon transducers is important because it allows for the characterization of the transducer's performance and can help identify any potential issues. It can also be used to optimize the design and operation of the transducer to improve its overall performance.

5. What are the common methods for measuring dynamic resistance vs temperature for ribbon transducers?

The most common methods for measuring dynamic resistance vs temperature for ribbon transducers include the four-point probe method, the two-point probe method, and the current-voltage method. These methods involve applying a known voltage or current to the transducer and measuring the resulting resistance at different temperatures.

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