The realization of the cleaning effect of ultrasonic cleaning machine mainly depends on "cavitation effect". Therefore, the effect of "cavitation" can affect the performance of the machine; The high performance of the machine determines the cleaning effect. In order to achieve the purpose of cleaning, the root should be traced back to its source. Therefore, the influence factors of cavitation effect cannot be ignored.

（1）頻率的選擇

(1) Frequency selection

清洗液中即使通入超聲波，并不一定能夠產生空化小泡；即使產生了空化小泡，也不一定能夠完全爆破；即使爆破了，超聲清洗機清洗也不一定能夠達到良好的剝脫污物的效果。

Even if ultrasonic wave is introduced into the cleaning solution, cavitation bubbles may not be generated; Even if cavitation bubbles are produced, they may not be able to completely explode; Even after blasting, ultrasonic cleaning machine may not achieve a good effect of stripping dirt.

每一種液體都有自己的“空化閾值”。就是超聲波振動產生的負壓超過了液體本身的靜壓力，才能將其撕開，形成真空泡。超聲空化閾值與超聲波頻率有密切的關系

Each liquid has its own "cavitation threshold". It is only when the negative pressure generated by ultrasonic vibration exceeds the static pressure of the liquid itself that it can be torn to form a vacuum bubble. There is a close relationship between ultrasonic cavitation threshold and ultrasonic frequency

頻率越高，空化閾值越高。因為超聲波的頻率越高，它的能量就會很低，沒有那么大的力氣撕開液體形成空泡。所以高頻率的超聲波不容易在液體中形成空化泡，要產生空化，就需要加大聲功率。

The higher the frequency, the higher the cavitation threshold. Because the higher the frequency of the ultrasonic wave, the lower its energy will be, and there is not so much force to tear the liquid to form bubbles. Therefore, high-frequency ultrasound is not easy to form cavitation bubbles in the liquid. To produce cavitation, it is necessary to increase the power.

反過來，頻率越低，產生空化就越容易。而且，頻率低了，撕開和擠壓兩者之間的時間間隔就多了許多，生成的小泡有足夠的時間來完成生長，由小變大，那么它爆破時產生的沖擊力就更大了，更有利于清洗。

Conversely, the lower the frequency, the easier it is to produce cavitation. In addition, the lower the frequency, the longer the time interval between tearing and squeezing, and the generated bubbles have enough time to complete the growth, from small to large, so the impact force generated when it explodes is greater, which is more conducive to cleaning.

高頻與低頻，就像馬跑得很快，但力氣小，拉不了太多的重物；而牛跑得很慢，但力氣很大，拉著一大車牛糞都能夠閑庭散步，其實各有用處。

High frequency and low frequency are like horses running fast, but with little strength, they can't pull too much weight; The cow runs very slowly, but has great strength. It can walk in a leisurely way with a cart of cow dung. In fact, each has its own use.

我們可以根據清洗對象將超聲波頻率分為3個頻段：低頻（20KHz—50KHz），高頻（50KHz—200KHz），超高頻（700KHz—1MHz以上）。在相同的功率下，40KHz頻率的超聲波比100KHz的超聲波產生更多的空化泡，穿透能力更強，但容易造成器械表面的腐蝕和損壞，噪聲也更大。

We can divide the ultrasonic frequency into three frequency bands according to the cleaning object: low frequency (20KHz-50KHz), high frequency (50KHz-200KHz), and ultra-high frequency (700KHz-1MHz or above). At the same power, 40KHz ultrasonic wave produces more cavitation bubbles than 100KHz ultrasonic wave, with stronger penetration ability, but it is easy to cause corrosion and damage to the surface of the instrument, and the noise is also greater.

因此，高頻超聲波適用于清洗精密精細的器械，低頻超聲波適用于清洗粗大堅固的器械。

Therefore, high-frequency ultrasound is suitable for cleaning precision and fine instruments, while low-frequency ultrasound is suitable for cleaning thick and solid instruments.

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