What is Sensitivity and Measurement Range in Quartz Accelerometer?

A quartz accelerometer is an instrument used to measure acceleration, commonly found in physics, engineering, and other related fields. When  design and select the quartz accelerometer,we need to consider the main specifications are: measurement range, sensitivity. The sensitivity of acceleration sensor is one of the most basic indicators of sensor. The sensitivity of the sensor directly affects the measurement of vibration signal. The measurement range of the acceleration value sensor refers to the maximum measurement value that the sensor can measure within a certain nonlinear error range. The nonlinear error of the universal piezoelectric acceleration sensor is mostly 1%. As a general principle,the higher the sensitivity, the smaller the measurement range,and the smaller the sensitivity, the larger the measurement range.

The sensitivity of the  quartz accelerometer

Sensitivity refers to the degree of response of a quartz accelerometer to changes in acceleration, usually expressed by changes in output voltage or current caused by changes in unit acceleration. The higher the sensitivity, the stronger the quartz accelerometer’s ability to detect small acceleration changes. Quartz accelerometer sensitivity – generally expressed in units such as WV/g or pC/g.

The capacitance of quartz flexible accelerometer is an important factor affecting its sensitivity. Generally,the larger the capacitor, the higher its vibration sensitivity, but the higher the sensitivity, the noise immunity will be reduced accordingly. Therefore, the capacitance size of the quartz flexible accelerometer needs to be selected reasonably.

The measuring range of the quartz  accelerometer

The measuring range of the quartz accelerometer is the maximum acceleration that can be measured under the specified performance index, which is measured and evaluated from both positive and negative directions. The level of acceleration supported by the acceleration sensor output signal specification is usually expressed as ±g, which is the maximum acceleration that the device can measure and accurately represent through its output. The ER-QA-03B designed for this purpose has measurement range of ±70g and bias repeatability of 10-30μg and scale factor repeatability of 15-50ppm. It is of great significance to improve the measuring range of quartz flexible accelerometer. First, with the rapid development of strapdown inertial navigation systems in recent years, the range of accelerometers that are required to be sensitive to has increased exponentially. If the magnitude of the linear acceleration exceeds the measurement range of the accelerometer, noise can be found in the output of the accelerometer, in which case the accelerometer does not properly reflect the input motion acceleration. Therefore, expanding the measuring range of quartz flexible accelerometer is an important strategic means to meet the needs of model development. In addition, the application field of quartz flexible accelerometer has gradually expanded, and many application fields have wider and wider measurement range requirements.

Application characteristics

The two basic indicators of sensitivity and measurement range have different requirements for different application scenarios. In the selection of quartz accelerometer, it is necessary to consider these indicators according to the actual needs to choose the most suitable quartz accelerometer. For example, in the field of aerospace, quartz accelerometers are required to have high sensitivity and a wide frequency response range in order to detect small changes in acceleration, and ER-QA-03A is designed for applications in this field with zero bias repeatability of 10-50μg and scale factor repeatability of 15-50 PPM. The second-order nonlinear repeatability is 10-30μg/g2.In the industrial production process, the linearity and temperature stability of the quartz accelerometer are required to ensure the accuracy of the measurement results.

Quartz  accelerometer has been widely used in various inertial navigation systems, and is one of the important measurement sensitive components in inertial navigation systems. With the development of inertial navigation systems, the requirements for inertial devices are becoming higher and higher. Sensitivity and measurement range as the most basic indicators of quartz accelerometer, but also the breakthrough point of the future development of quartz accelerometer technology.

If you want to know more about quartz accelerometers , please contact me through the following ways:

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