MEMS gyroscope is a micromechanical gyroscope based on the Coriolis force principle. As a new technology in the 21st century, MEMS technology continues to advance. Nowadays, many high-precision MEMS gyroscope can reach navigation-level standards and are comparable to high-precision fiber optic gyroscopes in the market. At the same time, MEMS gyroscopes are also widely used in fields such as petroleum logging, aerospace, mining, and surveying.
To judge whether the performance of a MEMS gyroscope is excellent, it needs to be judged by its parameters, such as measuring range, bias instability, angle random walk, resolution, etc. These parameters are important indicators for judging the performance of MEMS gyroscope, and also determine the application environment of the gyroscope.
Resolution: It refers to the minimum angular velocity that the gyroscope can detect. This parameter and the zero angular velocity output are actually determined by the white noise of the gyroscope.
Measuring range: Usually expressed by the maximum value of the input forward and reverse angular rates. The larger the value, the more sensitive the gyroscope is to angular rate. Within this input angular rate range, the nonlinearity of the gyroscope scale factor can meet the specified requirements, and the gyroscope's range can usually be configured. For example, , the measuring ranges of ER-MG2-50/100 are 50 and 100 respectively, so they are named accordingly.
Bias instability: It is the drift amount of the gyroscope output that changes with time at a stable temperature. Gyroscopes are subject to bias instability, where the gyroscope's initial zero reading drifts over time due to the integration of inherent imperfections and noise within the device.
Angular random walk: If you integrate a noisy output signal from a sensor, such as integrating an angular rate signal to determine the angle, the integral will drift in time due to noise. This drift is called a random walk because the integral appears to take random steps from one sample to the next. The standard deviation of the drift caused by noise can be recovered by multiplying the random walk by the square root of time.
Bias stability (1σ 10s): This is what we usually call Allen's variance, which is the most commonly used measurement. The measurement tells you how stable the gyroscope bias is over a specific specified period of time. In general, the lower the bias stability, the smaller the error when integrating the gyroscope output over time.
Temperature range: The general temperature range of MEMS gyroscope is −45°C to +85°C, which represents the temperature range in which the gyroscope can operate. However, the requirements for the petroleum logging industry will be higher. Many tools may require the gyroscope to reach 125 degrees or even 175 degrees. Most MEMS gyroscopes can reach a maximum temperature of 85 degrees, but ER-MG2-022 can reach 125 degrees. This is a MEMS gyroscope specially designed for gyro tools.
I hope you can understand the basic parameters of MEMS gyroscope through this article. If you want to know more about MEMS gyroscope products and content, please click on the relevant articles and related products below.
More Technical Questions
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3.How to select MEMS gyroscope?
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