What does a quartz flexible accelerometer do?

The structure of quartz flexible accelerometer

Quartz acceleration sensor is called quartz flexible acceleration sensor with flexible support technology, quartz flexible accelerometer is composed of quartz crystal, elastomer, electrode and circuit. Among them, quartz crystal is the core component of the sensor, which has high stability, high precision and high sensitivity. The elastomer is the part that connects the quartz crystal to the electrode, which is able to convert the external acceleration into the quartz crystal’s strain signal. The electrodes are used to detect the strain signal of the quartz crystal and convert it into an electrical signal. The circuit amplifies and processes the electrical signal, and finally outputs the acceleration value.

The working principle of quartz flexible accelerometer

The working principle of the quartz flexible accelerometer is based on the piezoelectric effect of the quartz crystal. When a quartz crystal is subjected to external acceleration, strain is generated, which changes its piezoelectric properties. This strain is transferred to the elastomer, causing it to deform. The elastic body after deformation changes the piezoelectric characteristics of the quartz crystal, thus generating electrical signals. By detecting the size and direction of this electrical signal, the magnitude and direction of the external acceleration can be determined. Therefore, in the inertial navigation system, the quartz accelerometer can be used to complete the initial static orientation of the activity. ER-QA-01A has bias repeatability≤10 μg, scale factor repeatability≤10 PPM, second-order non-linearity repeatability≤10 μg/g 2.

Inertial navigation and guidance system

Missiles, aircraft, ships, combat vehicles, and other navigation guidance systems must have speed and position information. In low-requirement situations, people use airspeed meters, Mach number sensors, odometers, etc., but as the performance requirements of weapon systems Improve, the above instruments can no longer meet the requirements. The linear accelerometer can be installed in a moving object to measure its acceleration directly, and then obtain the speed and position. It has high measurement accuracy and good dynamic performance, which is much better than the air speed meter and odometer. Therefore, the use of linear accelerometers for inertial navigation guidance systems is one of its main applications.The attitude indication system on the aircraft mainly refers to the instrument system that accurately measures and indicates the attitude of the aircraft, which provides the pitch Angle, roll Angle and yaw Angle for the pilot and other on-board electronic products (such as flight guidance system, automatic flight control system and radar, etc.).

Tilt measurement and leveling system

In a gravitational field, a linear accelerometer can measure changes in gravitational acceleration. When the sensitive axis is perpendicular to the horizontal plane, the accelerometer indicates the unit gravity acceleration; if the sensitive axis is tilted, its output is the product of the gravity acceleration and the sine function of the tilt angle. Using this principle, it can be used for tilt measurement and leveling. For example, the leveling of fire control gun sight radar and anti-aircraft radar; in addition, the tilt angle is controlled by measuring the lateral acceleration of trains and cars so that they can still drive at high speeds on curves.

Petroleum logging

Quartz flexible accelerometer is mainly used to measure the physical properties of formation and the characteristic parameters of oil and gas reservoir in petroleum logging. It can measure the speed and direction of seismic wave propagation in the formation, so as to determine the density, velocity and Poisson’s ratio of the formation physical parameters. At the same time, it can also measure the reflection and refraction of seismic waves, so as to determine the location, thickness and shape of oil and gas reservoirs.

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