Tuning Fork Modes

调谐叉模式

The tuning fork has a very stable pitch and has been used as a pitch standard since the Baroque period.

调谐叉具有非常稳定的音调，自巴洛克时期以来一直被用作音调标准。

The "clang" mode has a frequency which depends upon the details of construction, but is usuallly somewhat above 6 times the frequency of the fundamental. This is close to the first overtone of the clamped bar. The clang tone dies away rapidly.

‘clang’模式的频率取决于结构细节，但通常略高于基频的6倍。这接近于夹紧条的第一泛音。‘clang’音迅速衰减。

The two sides or "tines" of the tuning fork vibrate at the same frequency but move in opposite directions at any given time. The two sound waves generated will show the phenomenon of sound interference.

调谐叉的两个边或“叉柄”在任何时刻以相同频率振动，但方向相反。由这两个声源产生的声波将表现出声干涉现象。

Illustration with oscilloscope

示意图与示波器

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Tuning Fork and Oscilloscope

音叉和示波器

The tuning fork sound is picked up by the microphone and displayed on the screen of an oscilloscope. Once the fork has settled down to its fundamental mode, it produces a sine wave trace on the oscilloscope.

调谐叉的声音被麦克风拾取并在示波器的屏幕上显示出来。一旦叉子稳定在基频模式，它会在示波器上产生一个正弦波轨迹。