There are many types of acceleration sensors, such as piezoresistive acceleration sensors, flexible acceleration sensors, hydromagnetic levitation accelerometers, quartz capacitive accelerometers, MEMS accelerometers, etc. Acceleration sensors are divided into open-loop and closed-loop types. Generally, open-loop sensors have lower technical indicators and closed-loop sensors. The technical indicators are relatively high. Therefore, considering only the technical indicators, we plan to use closed-loop sensors. The following analyzes and compares the performance advantages and disadvantages of the liquid magnetic levitation accelerometer, quartz capacitive accelerometer, and MEMS accelerometer.
(1) Liquid magnetic levitation accelerometer
The liquid magnetic levitation accelerometer is an accelerometer widely used in early MWD instruments. Its main advantages are good vibration resistance, shock resistance, and high temperature resistance; the disadvantage is that it takes a long time to reach normal operation and has poor temperature characteristics.
(2) Quartz capacitive accelerometer
Quartz capacitive accelerometer is an acceleration sensitive device developed for navigation. Its advantage is highaccuracy, good stability, high temperature resistance, and good temperature characteristics; but the aerospace type has poor impact resistance, because after the limit pin is added to the civil acceleration, its vibration resistance and impact resistance are greatly improved, and it is now also a while drilling instrument pick the accelerometer used.
(3) MEMS accelerometer
MEMS accelerometer is a new type of accelerometer developed in recent years. Due to the factors of structure and production process, its most prominent features are small size, vibration resistance, shock resistance and high temperature resistance. The disadvantage is poor temperature characteristics.
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