What is Hemispherical Resonator Gyroscope (HRG)

The hemispherical resonator gyroscope (HRG), also called wine-glass gyroscope or mushroom gyro, is a compact, low-noise, high-performance angular rate or rotation sensor. An HRG is made using a thin solid-state hemispherical shell, anchored by a thick stem. This shell is driven to a flexural resonance by electrostatic forces generated by electrodes which are deposited directly onto separate fused-quartz structures that surround the shell. The gyroscopic effect is obtained from the inertial property of the flexural standing waves. Although the HRG is a mechanical system, it has no moving parts, and can be very compact.

Hemispherical Resonator Gyro Performance

Hemispherical Resonator Gyro is a new type of high-precision, high-reliability and long-life solid-state gyroscope. It uses the radial vibration standing wave precession effect of the hemispherical shell lip to sense the rotation of the base. It has high measurement accuracy, super stability and reliability, good shock and vibration resistance and temperature performance, and especially has a unique shutdown anti-radiation ability. In particular, the life expectancy is as high as 15 years. It is a key component of satellite or spacecraft inertial measurement unit and attitude stability control. It has unique advantages and broad prospects in space applications.

Advantages of Hemispherical Resonator Gyro

Hemispherical Resonator Gyro is the core key component of gyroscope. It has the advantages of light weight, high reliability and long life. It is widely used in satellites, missile weapons, ships and other equipment. Generally, Hemispherical Resonator Gyro also have the characteristics of hard and brittle materials, thin walls, complex shapes, and high processing accuracy requirements, which seriously exceed the precision manufacturing of quartz resonators.

Applications of Hemispherical Resonator Gyro

Small size, low noise, high performance and no wear-out has made the Hemispherical Resonator Gyroscope (HRG) the choice for high value space missions. Its versatility will be shown by its use for space craft stabilization, precision pointing, air craft navigation, strategic accuracy systems, oil bore hole exploration and planetary exploration.
This is the resonator for a Hemispherical Resonator Gyro (HRG). An HRG senses acceleration by the change in phase of vibration of a cup-shaped resonator, similar to the way a wine-glass resonates when rubbed by a wet finger. The device is rugged and accurate, and it has replaced other models of mechanical gyroscopes on most deep-space missions, as well as in other applications.

Pictures of Quartz Wine-glass Gyroscope

Detailed Video of Hemispherical Resonator Gyroscope HRG

VY Optics Workshop Video
 

People also ask

• What is ODR in gyroscope?
  Output data rate — Rate at which gyroscope data is sampled. 12.5 Hz (default) | 26 Hz | 52 Hz | 104 Hz | 208 Hz | 416 Hz | 833 Hz | 1666 Hz | 3332 Hz | 6664 Hz.

Want to learn more / get a quote? Just click here to contact us now~