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Ultrasonic waves can be categorized into two main types based on their duration: continuous waves and pulse waves. A continuous wave refers to a vibration that occurs without interruption in the medium, meaning the oscillation is sustained over time. In contrast, a pulse wave is characterized by a limited period of vibration, which may occur as a single burst or in repeated intervals.
**Definition**
A continuous wave is a type of signal generated by an electro-acupuncture device, consisting of a fixed frequency sequence with no modulation. The frequency range of continuous waves typically falls between 1 Hz and 1000 Hz. Waves below 30 Hz are classified as "sparse waves," while those above 30 Hz are referred to as "dense waves." On the other hand, a pulse wave is a short, sudden electrical signal that appears intermittently. Any voltage or current that occurs in brief, isolated bursts is considered a pulse. In telecommunications, any waveform that is not a sine wave or a continuous wave made up of sinusoidal components is called a pulse wave.
**Function**
Pulse waves are more resistant to external interference and can carry encoded information effectively. They are often used in applications where precision and clarity are essential. Continuous waves, however, are capable of detecting objects moving at various speeds, though they may require more advanced techniques to achieve this level of accuracy.
**Waveform Characteristics**
The key difference lies in the timing of the waveforms. A continuous wave has no breaks; it flows uninterrupted over time. In contrast, a pulse wave is discontinuous, with periods of no activity between each burst. In terms of laser output, a continuous wave emits energy constantly, while a pulse wave emits it in short, periodic bursts.
**Visual Representation**
Here are examples of both waveforms:
*Continuous wave waveform*
*Pulse wave waveform*
Understanding these differences is crucial when selecting the appropriate type of wave for specific applications, such as medical treatments, communication systems, or industrial sensing. Each has its own advantages and limitations depending on the context in which it is used.
August 09, 2025