Air Density Compensation of Tuning Fork Sensor Using Kalman Filter

作者：Okamoto Kohei^*; Aikawa Naoyuki

来源：Electronics and Communications in Japan, 2017, 100(3): 39-46.

DOI：10.1002/ecj.11938

• Kalman filter
• air density compensation
• temperature compensation
• atmospheric pressure compensation
• tuning fork sensor

Vibration sensor is used as a sensor to measure pressure, force, acceleration, and density. In particular, tuning fork sensor is suitable as a sensor for electronic balance due to high sensitivity to the force and its long-term stability. However, tuning force sensor is affected by the temperature and the air density. Therefore, it is necessary to compensate the effects of them. In the conventional method, we could not compensate adequately for the abrupt change in the air density into the delay of smoothing filter. In this paper, we propose accurate compensation method of the drift, which is caused by changing the air density of tuning fork sensor. Applying Kalman filter, the drift of the tuning fork sensor can be very small even with an abrupt change in the air density and there is noise in the measured atmospheric pressure and the frequency.

• 出版日期2017-3