Forum Posts

• Roro Yang

  • 25 posts
  Posted in the topic What are the materials and characteristics of MEMS gyroscope? in the forum Technology

  November 17, 2023 3:42 AM EST

  MEMS gyroscope is a device based on microelectromechanical system technology. It is primarily made of silicon, but also comes in other materials such as germanium and gallium arsenide.

  There are three main characteristics that need to be considered during the production process of MEMS gyroscope: elasticity, inelasticity and strength. Other properties also need to be considered, such as resistivity, thermal conductivity, coefficient of thermal expansion, chemical resistance, etc. Some properties depend on the specific MEMS device, such as thermal, electrical, chemical and optical properties.

   

  Elastic properties

  Elastic properties are crucial to the performance of MEMS gyroscope and are mainly determined by two parameters: Young's modulus and Poisson's ratio. Young's modulus represents the stiffness of a material, while Poisson's ratio describes the material's expansion in a direction perpendicular to the direction of compression. Both parameters can be measured using load deflection techniques.

  Inelastic properties

  Plastic deformation occurs when a material deforms under stress without returning to its original shape. Therefore, it is crucial to study the behavior of MEMS materials during inelastic deformation. Fatigue is also an important characteristic because it indicates how a MEMS gyroscope will perform under constant stress or multiple stress cycles. Fatigue can lead to plastic deformation, which can lead to failure or performance degradation of MEMS gyroscope.

  Strength properties

  There are several key strength-related properties in MEMS technology, such as tensile strength, fracture strength, flexural strength, and yield strength. They all demonstrate the reliability and robustness of MEMS gyroscope. These properties can be enhanced by optimizing the geometric design.

  MEMS gyroscope uses the following types of materials:

  Non-metals: silicon, germanium and gallium arsenide

  Metals: Nickel and Aluminum

  Polymer: SU8 and polyamide

  Ceramics: diamond, SiC, SiO2, Si3N4

   

  If you wanna learn more knowledge about MEMS gyroscope, you can read the application box

   

  Contact me:

  Email: info@ericcointernational.com

  Whatsapp: 173 9198 8506
• Roro Yang

  • 25 posts
  Posted in the topic What’s the advantages and disadvantages of MEMS gyroscope? in the forum Technology

  November 16, 2023 4:35 AM EST

  MEMS gyroscope is an inertial sensor, which is a small device that measures angular velocity or rotation rate. It can play a role in aerospace, drones and other fields, and is also used in navigation systems to detect changes in direction and measure pitch, roll and yaw. At the same time, it can also be used in fields such as petroleum logging and mining, providing north-finding solutions, pointing and initial alignment, etc.

   

  Disadvantages of MEMS gyroscope

  1. Output results need to be controlled and compensated

  Generally, MEMS gyroscopes are designed so that both the driving mode and the sensing mode can reach resonance, or both modes can be resonated through electronic tuning. However, although appropriately increasing the frequency peak spacing between the driving mode and the sensing mode can reduce frequency drift caused by changes in system parameters, the response output still requires advanced control methods and signal processing to compensate.

  2. Immaturity of photolithography technology and microfabrication processing

  Today, photolithography technology and microfabrication processing are still immature, which limits the perfect manufacturing of high-performance inertial sensors including MEMS gyroscopes. And the inherent errors in the manufacturing of its mechanical structure limit the performance, stability and sensitivity of MEMS gyros. The requirement of modal matching causes the dynamic characteristics of MEMS gyros, such as resonance frequency and sensitivity, to deviate drastically from the expected design values, and the various performance indicators of the same MEMS gyros produced in each batch are also different. These errors are caused by deviations in the photolithography steps and processes as well as the presence of deposition conditions and residual stress.

  3. Affected by temperature changes

  Changes in temperature also affect the dimensions of the structure, thus destroying the accuracy of the actual dynamic system parameters.

  However, experts have done a lot of research on reducing errors in gyroscope measurements, such as studying the design of symmetrical suspension systems, which can improve better modal matching and reduce temperature drift. With the increasing advancement of science and technology, MEMS technology is making breakthroughs and changes every day, and will better match the needs of the market in the future.

   

  Advantages of MEMS gyroscope

  Has shown in the reference

   

  Contact me:

  Email: info@ericcointernational.com

  Whatsapp: 173 9198 8506
• Roro Yang

  • 25 posts
  Posted in the topic North Finder: concept | working principle | classification | application in surveying in the forum Technology

  November 16, 2023 1:15 AM EST

  Gyroscopic north seekers have been widely used in mobile weapon orientation, oil drilling and other fields. The following will introduce the relevant knowledge of north seekers from the concept, principle, classification and application fields of north seekers.

  The Concept of North Seeker

  A north seeker is a type of compass. It is a precision inertial measurement instrument used to find the true north value of a certain location. It is usually used to provide azimuth reference for mobile weapon systems such as artillery, surface-to-surface missiles, and ground radars. . At the same time, the north seeker is also an inertial measurement system that uses the gyro principle to determine the projection direction of the earth’s rotation angular rate in the local horizontal plane (i.e., the true north position).

  Basic Principles of Gyro North Seeker

  The Earth rotates around its axis at a constant angular velocity. For a point on the earth with latitude φ, the angular velocity of the earth’s rotation at that point can be decomposed into two components, the horizontal component (formula: ωe1=ωecos&phipointing to true north along the earth’s longitude, and the vertical component (formula: ωe2=ωesin&phiVertically upward along the earth’s vertical line, as shown in Figure 1, the north direction information of the measured point on the earth can be obtained by measuring the horizontal component of the earth’s rotation angular velocity using inertial technology or being sensitive to it. This is the core principle of gyro north-finding technology.

  

   Figure 1  Ground speed component

  Its north-seeking process does not require an external reference. In addition to being limited by high latitude, its north-seeking measurement is not affected by weather, day and night time, geomagnetic field and site visibility conditions. North seekers are extremely sensitive to environmental vibration interference (especially low-frequency vibration interference).

  If you are interested in this north finder, you can leave me a message or send a quote and I will send you the price and technical description.
  contact us:
  Email: info@ericcointernational.com
  WeChat: 13992884879
  WhatsApp: 13630231561

• Roro Yang

  • 25 posts
  Posted in the topic What’s the advantages and disadvantages of MEMS gyroscope? in the forum Technology

  November 15, 2023 4:16 AM EST

  MEMS gyroscope is an inertial sensor, which is a small device that measures angular velocity or rotation rate. It can play a role in aerospace, drones and other fields, and is also used in navigation systems to detect changes in direction and measure pitch, roll and yaw. At the same time, it can also be used in fields such as petroleum logging and mining, providing north-finding solutions, pointing and initial alignment, etc.

  Before understanding the advantages and disadvantages of MEMS gyroscopes, let us understand how it works firstly.

  MEMS is the abbreviation of Micro-Electromechanical System. MEMS gyroscopes use the Coriolis Force effect to measure the angular rate of moving objects. This effect produces a force that acts on a moving mass in a rotating system, perpendicular to the mass’s velocity and axis of rotation, and is used to determine the object’s angular rate or rate of rotation.

   

  Advantages of MEMS gyroscope

  1.Small size and light weight

  MEMS gyroscope is smaller and lighter than traditional mechanical gyroscope and FOG (Fiber Optic Gyroscope). Ideal for applications with tight size and weight constraints, such as consumer-grade smartphones and microphones, and tactical and navigation-grade for oil logging tools. For smartphones and VR, small size is an essential part but the MEMS gyros used in these fields are also consumer-grade and have low accuracy levels. For fields such as petroleum logging and mining, many gyro tools have special-shaped probe tubes that cannot be accessed by ordinary large-size gyroscopes, and small-size gyroscopes such as MEMS gyroscopes are needed to meet their needs. Moreover, the north seekers used in some mining equipment have size restrictions. As the core component of the north seeker, the gyroscope needs to meet its small size requirements. The size of a MEMS gyroscope is fingernail size. Ericco’s MEMS gyro sensors are all of the same size of 11x11x2mm. And Ericco is mainly responsible for the production and manufacturing of tactical-grade and navigation-grade MEMS gyroscopes, such as the navigation-grade MG2-50/100 and the tactical-grade MG2-067, which are high-performance and hot-selling gyroscopes. 

  2. Low cost and easy to mass produce

  Due to the micromachining process and small size, MEMS gyroscopes are more cost-effective to produce than traditional gyroscopes, which also makes mass production easier, allowing them to be used in a wider range of industries and applications. For some fields and companies that need to control costs, MEMS gyros have also become a hot choice.

  3. Good reliability

  The main material of MEMS gyroscope is silicon, which is manufactured using some of the same processes and tools used to manufacture integrated circuits, such as deposition, photolithography, and etching. Its solid-state construction provides greater reliability and longer life than mechanical gyroscopes that are prone to wear and tear.

  4. Low power consumption

  Due to their small size, MEMS gyroscopes consume less power than mechanical gyroscopes, which is a critical factor for battery-powered devices and energy-saving systems.

   

  Disadvantages of MEMS gyroscope

  1. Output results need to be controlled and compensated

  Generally, MEMS gyroscopes are designed so that both the driving mode and the sensing mode can reach resonance, or both modes can be resonated through electronic tuning. However, although appropriately increasing the frequency peak spacing between the driving mode and the sensing mode can reduce frequency drift caused by changes in system parameters, the response output still requires advanced control methods and signal processing to compensate.

  2. Immaturity of photolithography technology and microfabrication processing

  Today, photolithography technology and microfabrication processing are still immature, which limits the perfect manufacturing of high-performance inertial sensors including MEMS gyroscopes. And the inherent errors in the manufacturing of its mechanical structure limit the performance, stability and sensitivity of MEMS gyros. The requirement of modal matching causes the dynamic characteristics of MEMS gyros, such as resonance frequency and sensitivity, to deviate drastically from the expected design values, and the various performance indicators of the same MEMS gyros produced in each batch are also different. These errors are caused by deviations in the photolithography steps and processes as well as the presence of deposition conditions and residual stress.

  3. Affected by temperature changes

  Changes in temperature also affect the dimensions of the structure, thus destroying the accuracy of the actual dynamic system parameters.

  However, experts have done a lot of research on reducing errors in gyroscope measurements, such as studying the design of symmetrical suspension systems, which can improve better modal matching and reduce temperature drift. With the increasing advancement of science and technology, MEMS technology is making breakthroughs and changes every day, and will better match the needs of the market in the future.

  Through the content of this article, I hope you can understand the advantages and disadvantages of MEMS gyros. There is no perfect device, but as technology advances, its disadvantages will be reduced or even eliminated through various research and compensation measures. If you want to learn more about the relating knowledge and products of MEMS gyro sensor, please read the “relating articles” and “relating products” below.

  Read the reference

   

  Contact me:

  Email: info@ericcointernational.com

  Whatsapp: 173 9198 8506
• Roro Yang

  • 25 posts
  Posted in the topic Everything you need to know about this MEMS gyroscope in the forum Technology

  November 14, 2023 4:45 AM EST

  MG2-100 is a navigation-grade micromachined single-axis MEMS gyroscope. It provides high-precision north seeking angle rate measurement, its power consumption is very low, the bias stability (Allan variance) is only 0.02°/h, and the bias stability (1σ 10s) is only 0.1°/h. The MG2-100 is optimized for high accuracy and stability. MG2-100 is specially designed for north seeking. The advanced differential sensor design rejects the influence of linear acceleration. Angular rate data is represented as 24-bit words. It comes in a hermetically sealed ceramic LCC surface-mount package and is capable of operation over a 5V supply and a wide temperature range (−45°C to +85°C).

   

  MEMS gyroscope MG2-100 is available in a compact 11 x 11 x 2mm package. When the gyroscope is in fully operational mode, power consumption is typically 40mA. It is mainly used in oil drilling, aviation and other fields. At the same time, it can be placed in IMU (Inertial Measurement Unit), north finder, gyro compass, drilling tools and inertial navigation system. Due to its high performance, MG2-100 can also be used for high-precision attitude measurement, stability control, positioning, navigation-grade MEMS IMU/INS, land surveying/land mobile mapping systems, railway train systems, etc. As an advanced differential sensor design, it suppresses the effects of linear acceleration, allowing it to operate in extremely harsh environments where shock and vibration are present.

  Application

  1. Oil and gas fields

  Gyroscope measurement is an essential part of drilling, and the worst environment for gyroscope use is in the oil and gas downhole drilling industry.

  MG2-100 MEMS gyroscope uses a solid-state sensor design that can withstand extreme conditions such as downhole shock and vibration. It does not require recalibration during use and consumes less energy. The same battery can last longer. The embedded gyroscope MWD of MG2-100 can meet the accuracy requirements required by today's complex drilling environment, and due to its high accuracy, when used in conjunction with MWD tools, the uncertainty can be reduced by 45%, which is conducive to precise measurements.

  2.Aerospace

  Because aerospace technology has very high requirements on the functional density ratio of devices. In aerospace and aerospace applications, high-precision interferometric fiber optic gyroscopes are commonly used.

  MEMS gyroscope MG2-100 compared to FOG (Fiber Optic Gyroscope) can achieve the same high accuracy as FOG, but is much smaller, has lower emission quality, and is cheaper with lower power consumption to maintain temperature. It can be used in attitude and heading reference systems, flight control systems, modal testing, etc. in aerospace applications.

  More knowledge of MEMS gyroscope has shown in the application box

   

  Contact me:

  Email: info@ericcointernational.com

  Whatsapp: 173 9198 8506