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What type of crystal is a tuning fork crystal?

Update:30-10-2020
Summary:

Tuning bai fork crystal is a low-frequency crystal osci […]

Tuning bai fork crystal is a low-frequency crystal oscillator, the general frequency is about 10~100KHz.
   tuning fork is a "Y"-shaped steel or aluminum alloy sound generator.
Various tuning forks can emit pure tones of different frequencies when vibrating due to their mass and the length and thickness of the fork arms. Tuning fork examination is a simple and reliable common diagnostic method in identifying the nature of deafness-transmissive deafness or sensory deafness.
Using a tuning fork to obtain the "standard tone" is one of the most important links in the piano tuning process. Its importance is related to the pitch position of each key of a piano.
In teaching, tuning forks can be used to demonstrate resonance.
Hit the tuning fork to collect the sound wave waveform. The test found that: lightly tapping the tuning fork, the tuning fork amplitude is small, and the amplitude of the waveform graph is small, and the sound of the tuning fork is also small at this time; Note: The loudness is related to the amplitude of the tuning fork vibration. The greater the amplitude, the greater the loudness; the smaller the amplitude, the lower the loudness.
The tuning fork most commonly used by musicians at present has a frequency of 440 Hz. This pitch has long been used as the tuning standard of the orchestra, because it is the pitch of the second string of the violin and the high octave pitch of the first string of the viola and the first string of the cello. However, there are also various other pitch tuning forksChina Quartz Crystal Tuning Forks Manufacturers on the market, such as tuning forks that emit all the pitches of the reference group of the central part of the piano.
The tuning fork was invented by the Englishman John Shore in 1711. He is a court trumpet player, and the composers Georg Friedrich Handel and Henry Purcell have written specific passages for him in the music. He was still a lute player, and the lute was very difficult to tune. Scholl invented a tuning fork to tune the lute.

 

The sound of the tuning fork is very faint after being struck, and it is often heard only when it is held to the ear. For this reason, sometimes the tuning fork is pressed on a solid surface such as a table after being knocked. This action allows this surface to act as a resonance plate, which greatly increases the volume.
Tuning forks are mainly used for musical instrument tuning, although electronic tuners already exist, and some musicians have absolute sense of sound. When tuning forks need to be tuned, they can be adjusted at the bifurcated parts of the two ends: the part with the shortened tip is adjusted to increase the frequency or the middle joint of the two forks is trimmed to decrease the frequency; or the weight of the two forks is adjusted. Even after tuning, the frequency of the tuning fork will still be affected by the change in the elastic modulus of the material. In order to make the tuning fork emit an accurate pitch, it should still be sealed in a place with good temperature and humidity control. Large tuning forks are usually driven by electricity, like electric bells, so they can vibrate uninterruptedly.

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