High Performance North Seeking MEMS Gyroscope

▪ The north seeking MEMS gyroscope is based on the north-seeking method. To find the north is to determine the direction of true north. Generally, there are two methods: non-gyroscopic north seeking and gyroscopic north seeking. 

▪ Due to the continuous innovation of technology, MEMS gyroscope was born, which haｓ the advantages of low cost, small size, and low power consumption. Initially, MEMS gyroscope was less accurate and could not match the measurement accuracy of downhole MWD systems. With the development of integrated circuit technology, MEMS inertial sensors have developed rapidly in the inertial field, and their accuracy has been greatly improved. It not only meets the requirements of underground exploration, navigation and aerospace, precision measurement and other fields, but also has a series of advantages that other north-seeking sensors do not have, such as high reliability and easy mass production. It has gradually become the preferred inertial device in the military and civilian fields, especially in the drilling field. For the special conditions of drilling, small size and impact-resistant MEMS gyroscope is needed. ER-MG2-50/100 is a north seeking MEMS gyroscope specially designed for well logging/gyroscopes and mining/drilling equipment. er-mg2-100-north-seeking-mems-gyro.html Its main parameter is 0.01-0.02°/hr bias instability and 0.0025-0.005°/√hr angular random walk.
 
❓ So, what is the principle of Gyroscopic north seeking?
 
▪ Gyroscopic north seeking is mainly achieved by using a gyroscope. The gyroscope can provide attitude information and true north direction of the carrier. The purpose of downhole MWD is to measure the azimuth angle through the downhole north seeking system. Magnetic sensors measure the direction of magnetic north, known as magnetic north angle. Gyroscopes can measure the angle between the sensitive axis and true north, as well as the angle between true north and a set reference direction. Compared with fluxgate sensors, gyroscopes have the advantages of high accuracy, small size, and immunity to weather and geomagnetic interference, because it is a method that combines the sensitive earth's rotation rate with measurement schemes and mathematical calculations to determine the underground position. instrument. Therefore, during the measurement process of the borehole north-finding system, the measurement accuracy and error transmission and accumulation will not be reduced due to the depth of the borehole.