Popular Science Dry Goods | Cutting of Quartz Crystal

2024-08-30

What is quartz crystal?

Quartz CrystalHow widely used?

How much do you know about the cutting method of quartz crystal?

Crystal Popular Science-Cutting Mode of Quartz Crystal

Quartz crystal is a kindpiezoelectric effectimportant material, is widely used inElectronics, Communications, Opticsand other fields. quartz crystal rodCutting mode directly affects its performance and application scenarios. Different cutting patterns can change the mechanical, thermal and electrical properties of quartz crystals to meet the needs of a variety of specific applications. Today, we will introduce several common cutting modes of quartz crystal rods, includingAT cutting, BT cutting, SC cuttingWait.

Temperature profiles for different cutting modes

AT cutting

AT cutting is a common quartz crystal cutting method, mainly used in the manufacture of quartz oscillator.

Cutting angle: The crystal plane of the AT cut forms an angle of 35 ° 15 ′ with the Z axis.

Characteristics: AT-cut crystals have good temperature stability and are suitable for a wide temperature range. Its frequency-temperature characteristic curve is in the shape of a cubic curve with a low temperature coefficient.

Application: AT cutting is mainly used to manufacture quartz crystal oscillators, which are widely used in electronic watches, computers, communication equipment and other fields.

Cutting temperature curve is cubic curve

BT cutting

BT cutting is also a common quartz crystal cutting method, which has different temperature characteristics from AT cutting.

Cutting angle:The crystal plane of the BT cut is at an angle of 49 ° 10 ′ to the Z-axis.

Features:The BT-cut crystal has better frequency stability in the higher temperature range, but its frequency-temperature characteristic curve is in the shape of a quadratic curve.

Application:BT cutting is mainly used to manufacture high frequency oscillators and filters, which are suitable for applications that require high temperature stability, such as industrial control equipment and avionics equipment.

SC cutting

SC cutting is a cutting method designed for ultra-high stability requirements with excellent temperature characteristics.

Cutting angle:The SC cut is a double rotation cut angle, with the horizontal and vertical coordinates of phi 21.93 ° and θ 34.11 ° respectively.

Features:The SC-cut crystals maintain extremely high frequency stability over an extremely wide temperature range, the temperature coefficient is close to zero, and the frequency-temperature characteristic is almost linear.

Application:SC cutting is mainly used to manufacture high-precision frequency control devices, such as high-precision clocks, navigation systems and satellite communication equipment, such as OCXO constant temperature crystal oscillator, TCXO temperature compensation crystal oscillator.

Other cutting modes

In addition to the above common cutting methods, there are some specific cutting modes:

CT cutting, DT cutting, NT cutting, GT cutting, XY cuttingWait. These cutting methods are designed according to specific application requirements and meet other specific performance requirements.

Summary

quartz crystal rodCutting modedirectly affect itsPerformance and Application Areas.AT cuttingandBT cuttingIs the most common two ways, respectively, suitable for different temperature range of the oscillator application;SC cuttingFor high-precision frequency control devices;XY CuttingIt is mainly used for research and specific applications.

Understanding and selecting the appropriate cutting method can maximize the performance of quartz crystals and meet the needs of various high-tech fields.

With the continuous development of technology, new cutting modes will continue to emerge, opening up more possibilities for the application of quartz crystals.